Citations 19
An ethanol-induced loss of the lipid droplet–associated segregase VCP/p97 leads to hepatic steatosis
Sen, Sandhya , Weller, Shaun G. , Schulze, Ryan J. , Ding, Donglin , Casey, Carol A. , Weihl, Conrad C. , McNiven, Mark A. , Weihl, Conrad , Casey, Carol A , Ding, Donglin
Journal of Cell Biology | May 31, 2025 | Volume: 224 | Issue: 8 | Pages: No page available
The liver stores substantial numbers of neutral lipid organelles termed lipid droplets (LDs) that accumulate within hepatocytes in response to chronic ethanol (EtOH) consumption leading to hepatic steatosis. Mass spectrometry analysis of LDs isolated from EtOH-damaged rat livers revealed a substantial reduction in the valosin-containing protein ATPase (VCP/p97) that acts to remove targeted proteins from cellular membranes for degradation. Experimental disruption of VCP function resulted in an increase in LD content in hepatocytes and mouse livers along with a marked increase in LD-associated hydroxysteroid dehydrogenase (HSD17β13) known to contribute to hepatic steatosis. Surprisingly, treatment of hepatocytes with the proteasome inhibitor MG132 had no effect on HSD17β13 levels, while a disruption of lysosome function and chaperone-mediated autophagy increased cellular HSD17β13 levels substantially. These findings provide new insights into the cellular mechanisms by which the liver regulates its lipid stores and how this is disrupted by chronic EtOH exposure.
From pain to gain: Leveraging acetaminophen in hepatocyte transplantation for phenylketonuria
Schulze, Ryan J. , Nyberg, Scott L. , Strom, Stephen C , Nyberg, Scott L
Hepatology | December 12, 2023 | Volume: 79 | Issue: 5 | Pages: 973-975
Hepatic lipolysis by β‐adrenergic stimulation is inhibited by ethanol exposure
Weller, Shaun G. , McNiven, Mark A. , Schott, Micah B. , Rasineni, Karuna , Schulze, Ryan J. , Casey, Carol A.
The FASEB Journal | November 26, 2023 | Volume: 31 | Issue: S1 | Pages: No page available
10.1096/fasebj.31.1_supplement.390.2
Steatotic hepatocytes accumulate profound numbers of large neutral lipid‐storage organelles called lipid droplets (LDs). The process by which the formation or utilization of these organelles are perturbed during NAFLD and NASH is poorly defined. EtOH consumption can also exacerbate these conditions markedly by yet unknown mechanisms. Thus, there is a critical need to understand lipolytic mechanisms for LD catabolism in hepatocytes. In adipocytes, catecholamines induce lipolysis through a β‐adrenergic/cAMP pathway that activates cytosolic lipases ATGL and HSL to catabolize LD triglycerides. Importantly, β‐adrenergic induction of LD catabolism has not been demonstrated in hepatocytes. Thus, the GOAL of this study was to determine whether hepatocytes, like adipocytes, also undergo cAMP‐mediated lipolysis in response to β‐adrenergic (β‐AR) stimulation. First, treatment of primary rat hepatocytes or Hep3B human hepatoma cells with the β‐AR agonist isoproterenol caused a 20–40% reduction in total cellular LD content within 24 hours. β‐AR induced LD loss was mimicked by the cAMP agonist forskolin/IBMX and was abrogated by the cAMP‐dependent protein kinase (PKA) inhibitor H89. In correlation, PKA activation following β‐AR stimulation was confirmed by FRET biosensors and biochemical analysis. β‐AR stimulation directly activated the lipolytic pathway, as evidenced by cAMP/PKA‐mediated phosphorylation of hormone sensitive lipase (HSL) and adipose triglyceide lipase (ATGL). In addition, pharmacological inhibitors against ATGL or HSL each blocked β‐AR induced LD loss, suggesting that lipase activation is critical for this process in stimulated cells. To examine whether β‐AR/cAMP stimulation triggered lipase recruitment directly to the LD, live‐cell imaging of Hep3B cells expressing either ATGL‐EGFP or HSL‐sfGFP showed that within 60 min of stimulation, each lipase was significantly displaced from the cytosol and recruited to the LD surface. This recruitment was blocked by the PKA inhibitor H89. Finally, to test if EtOH exposure attenuates the activation of lipolysis in hepatocytes, we isolated primary hepatocytes from rats fed a 6‐week ethanol‐containing Lieber‐DeCarli diet. Compared with controls, ethanol‐exposed hepatocytes showed a drastic inhibition in lipase activation and LD breakdown following β‐AR/cAMP stimulation. Remarkably, in ethanol‐metabolizing VA13 hepatocytes, ethanol insult completely prevented isoproterenol‐induced translocation of ATGL‐EGFP to the LD. In summary , these results show that β‐adrenergic stimulation mobilizes cytosolic lipases for LD breakdown in hepatocytes, and perturbation of this pathway could be a major consequence of chronic ethanol insult leading to fatty liver. Manipulation of this regulatory cascade could be useful in developing new therapies to attenuate fatty liver disease. Support or Funding Information This study was generously supported by funding from NIAAA 5R01AA020735 (MAM and CAC) and NIDDK 5R37DK044650 (MAM), T32DK007352‐36 (MBS), and P30DK084567 (Mayo Clinic Center for Cell Signaling in Gastroenterology).
Sequential lipolysis and lipophagy pathways orchestrate lipid droplet breakdown in hepatocytes
Weller, Shaun G. , McNiven, Mark A. , Schott, Micah B. , Schulze, Ryan J.
The FASEB Journal | June 21, 2021 | Volume: 33 | Issue: S1 | Pages: No page available
10.1096/fasebj.2019.33.1_supplement.82.2
Neutral lipids are a critical source for cellular energy and are stored within specialized organelles known as lipid droplets (LD). Degradation of LDs for energy utilization is accomplished by two principal pathways: lipolysis that is activated by cAMP to recruit adipose triglyceride lipase (ATGL) to the LD surface, and lipophagy that utilizes the autophagic machinery to target and traffic LDs for degradation by lysosomal acid lipase (LAL). However, the mechanisms underlying synergy between these seemingly distinct pathways are not well understood. Previous studies show that autpohagic membrane cannot effectively engulf large organelles, but is size‐restricted to small cargo. Based on this, we HYPOTHESIZE that lipolysis and lipophagy are sequential pathways whereby lipolysis first reduces the size of large LDs to allow for subsequent autophagic engulfment of small LDs for lipophagy. Methods Using light and electron microscopy combined with biochemical approaches, we explored LD size and the sequential nature of lipolysis and lipophagy in primary rat and AML12 hepatocytes. Live‐cell microscopy was used for the first time to monitor LDs transitioning from lipolysis in the cytoplasm to lipophagy within endolysosomal vesicles. Results Confocal microscopy of endogenous ATGL revealed a preferential association with large LDs with an average size of 4.0 μm 2 , seven‐fold larger than LDs not associated with ATGL. In striking comparison, LDs associated with components of the autophagic machinery (LC3, Lamp3) were 50% smaller in size (0.39 μm 2 ). Consistent with this observation, siRNA knockdown of ATGL resulted in the persistence of large LDs (2.8 μm 2 ), whereas knockdown of LAL left cells filled with numerous small LDs (1.5 μm 2 ). These observations were mimicked by inhibitors of ATGL (atglistatin) and LAL (lalistat). In support of these findings, differential centrifugation of AML12 homogenates allowed for separation of two distinct populations of LDs: a buoyant fraction of large LDs enriched in the cytosolic lipase ATGL, and a second collection of smaller, less buoyant LDs enriched in lysosomal enzymes such as Lamp2A, the autophagosome marker LC3‐II, and the endosomal marker Tsg101. Most interesting are time lapse movies of live cells showing engulfment of small LDs by a Lamp3‐positive late endosomal compartment, suggesting that these organelles play an important role in the direct targeting and engulfment of LDs for lipophagy. Conclusion Hepatocytes appear to catabolize LDs in a tandem stepwise process that first utilizes cytosolic lipases to substantially reduce LD size, thereby allowing for subsequent engulfment of small LDs by autophagosomes as well as late endosomes and lysosomes. Support or Funding Information Supported by NIAAA RO1AA020735 to MAM; NIDDK award T32DK007352 to MBS and RJS, and the Mayo Clinic Kogod Aging Fellowship to MBS. This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .
Lipid Droplet Size Determines Cooperation of Lipolysis and Lipophagy in Hepatocytes.
Weller, Shaun G. , McNiven, Mark A. , Schott, Micah B. , Schulze, Ryan J.
The FASEB Journal | June 21, 2021 | Volume: 32 | Issue: S1 | Pages: No page available
10.1096/fasebj.2018.32.1_supplement.539.16
Fatty liver disease affects 80–100 million Americans and is a precursor to irreversible and sometimes fatal liver damage. The initial stages of fatty liver disease are marked by the hepatocellular accumulation of fat‐storage organelles known as lipid droplets (LDs) that are degraded by two pathways: lipolysis that involves the recruitment of cytosolic lipases (ATGL, HSL) to the LD surface, and lipophagy that relies on autophagic membranes to target and traffic LDs for lysosomal degradation. Importantly, the mechanisms underlying a cooperation between these seemingly distinct pathways are not well understood. Previous studies have shown that the autophagic engulfment of cytosolic cargo is size‐restricted. Because of this, we HYPOTHESIZE that lipolysis and lipophagy occur as sequential processes initiated by cytosolic lipases to reduce LD size and allow for subsequent engulfment by autophagic membranes. Methods In AML12 hepatocytes, immunofluorescence microscopy and biochemical approaches were used to determine the enrichment of lipolysis vs lipophagy machinery on large vs. small LDs. Live‐cell microscopy was used for the first time to monitor LDs transitioning from lipolysis to lipophagic engulfment. Results Confocal microscopy of AML12 cells immunolabeled for adipose triglyceride lipase (ATGL) revealed a preferential association with large LDs with an average area of 4.0 μm 2 , seven‐fold larger than LDs not associated with ATGL. In striking comparison, LDs associated with components of the autophagic machinery (LC3) were two‐fold smaller in area (0.39 μm 2 ). Consistent with this observation was the finding that siRNA knockdown of ATGL resulted in the persistence of large LDs (2.8 μm 2 ), whereas knockdown of lysosomal acid lipase (LAL) left cells filled with many LDs of a smaller size (1.5 μm 2 ). These observations were mimicked by inhibitors of ATGL (atglistatin) and lysosomal acidification (chloroquine). In support of these findings, differential centrifugation of AML12 homogenates allowed for separation of two distinct populations of LDs: a buoyant fraction of large LDs enriched in the cytosolic lipase ATGL, and a second collection of smaller, less buoyant LDs enriched in lysosomal enzymes such as Lamp2A and the autophagosome marker LC3‐II. Most interesting are time lapse movies of live cells showing engulfment of small LDs by a LAMP3‐positive late endosomal/lysosomal compartment, suggesting that these organelles play an important role in the direct targeting and engulfment of LDs for lipophagy. Conclusion Hepatocytes appear to catabolize LDs in a tandem stepwise process that first utilizes cytosolic lipases to substantially reduce LD size, thereby allowing for subsequent engulfment by autophagosomes as well as late endosomes and lysosomes. Support or Funding Information This study was generously supported by funding from NIAAA R01AA020735, NIDDK T32DK007352, and the Mayo Clinic Robert and Arlene Kogod Center on Aging. This abstract is from the Experimental Biology 2018 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .
Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition) 1
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Douglas , Falcó, Alberto , Fan, Daping , Fan, Jie , Fang, Evandro Fei , Fang, Yanshan , Fang, Yognqi, Farfel‐Becker, Tamar, Faure, Mathias , Fazeli, Gholamreza , Fedele, Anthony O., Feldman, Arthur M. , Feng, Jiachun , Feng, Lifeng , Feng, Wei , Araujo, Thaís Fenz , Ferguson, Thomas A., Fernández, Álvaro F. , Fernández‐Veledo, Sonia , Fernie, Alisdair R. , Ferrante, Anthony W. , Ferraresi, Alessandra , Ferrari, M , Ferreira, Julio Cesar Batista , Ferro‐Novick, Susan , Figueras, António , Filadi, Riccardo , Filigheddu, Nicoletta , Fimia, Gian María , Finetti, Francesca , Finkbeiner, Steven , Fisher, Edward A. , Fisher, Paul B. , Fliesler, Steven J. , Flo, Trude Helen , Florance, Ida , Florey, Oliver , Florio, Tullio , Fodor, Erika , Forlino, Antonella , Fortini, Paola , Fracassi, Anna , Franconi, Flavia , Frankel, Lisa B. , Fröhlich, Leopold F. , Fuentes, José M. , Fujiki, Yukio , Fulda, Simone , Furuya, Norihiko , Gack, Michaela U. , Gaffke, Lidia , Galadari, Sehamuddin , Galasso, Alessia , Galindo, Marı́a F. , Kankanamalage, Sachith Gallolu , Galluzzi, Lorenzo, Galy, Vincent , Gammoh, Noor , Ganley, Ian G. , Gao, Feng , Gao, Minghui , Gao, Ping , Gao, Wentao , Gao, Xiaobo , Garcerá, Ana , Garcia, María Noé , García, Verónica , Portillo, Francisco Garcı́a-del , García‐Escudero, Vega , García‐García, Aracely , García‐Macía, Marina , García‐Moreno, Diana , García‐Ruiz, Carmen , García‐Sanz, Patricia , Garg, Abhishek D. , Garofalo, Tina , Gassen, Nils C. , Gatica, Damián , Geiss‐Friedlander, Ruth , Genschik, Pascal , Gerbino, Valeria , Gerhardt, Christoph , Germain, Kyla , Germain, Marc , Afshar, Elham Ghasemipour, Ghavami, Saeid , Ghosh, Manosij , Giamas, Georgios , Giatromanolaki, Alexandra , Gibson, Gary E. , Ginet, Vanessa, Girardin, Stephen E. , Giridharan, Mridhula, Giuliano, Sandy , Giulivi, Cecilia , Giuriato, Sylvie , Giustiniani, Julien , Gluschko, Alexander , Goder, Veit , Goginashvili, Alexander , Gołąb, Jakub , Golebiewska, Anna , Gomes, Luciana Rodrigues, Gomez, Rodrigo Enrique, Gómez‐Sánchez, Rubén , Gómez‐Sintes, Raquel , Gong, Qingqiu , González‐Gallego, Javier , González‐Polo, Rosa A. , González‐Reyes, José A. , González-Rodríguez, Patricia , Goping, Ing Swie , Gorbunov, Nikolai V., Görgülü, Kıvanç , Gorojod, Roxana Mayra , Gorski, Sharon M. , Gotor, Cecilia , Gözüaçık, Devrim , Graef, Martin , Gräler, Markus H. , Granatiero, Veronica, Grasso, Daniel , Gray, Joshua P. , Greenhough, Alexander , Gregory, Stephen L. , Griffin, Edward F., Gros, Frédéric , Grose, Charles , Gross, Angelina S. , Грубер, Флориан , Grumati, Paolo , Gu, Xueyan , Guan, Jun‐Lin , Guardia, Carlos M. , Guda, Kishore , Guerra, Flora , Guerri, Consuelo , Guha, Prasun , Guillén, Carlos , Gujar, Shashi , Gukovskaya, Anna S. , Gukovsky, Ilya , Gunst, Jan , Günther, Andreas , Guo, Chuanyong , Guo, Chun , Guo, Hongqing , Guo, Ming , Gupta, Pawan , Gupta, Swapnil , Gupta, Veer Bala , Gupta, Vivek , Gutterman, David D. , H.B., Ranjitha, Haber, James E. , Hać, Aleksandra , Haidar, Mansour , Halldén, Gunnel , Hamacher‐Brady, Anne , Hamasaki, Maho , Hansen, Malene , Hao, Zijian, Harada, Masaru , Harhaji‐Trajkovic, Ljubica , Hariharan, Nirmala , Haspel, Jeffrey A. , Haucke, Volker , Hawkins, Wayne D. , Haynes, Cole M. , Hays, Thomas S. , He, Congcong , He, Qin , He, Rong‐Rong , He, You‐Wen , Heakal, Yasser, Heberle, Alexander Martin , Hejtmancik, J. Fielding , Henkel, Vanessa, Herb, Marc , Herman-Antosiewicz, Anna , Hernández, Agustín , Hernández, Carlos , Hernández-Díaz, Sergio , Hernández–Gea, Virginia , Herpin, Amaury , Herreros, Judit , Hervás, Javier H. , Hesselson, Daniel , Hetz, Claudio , Higuchi, Yujiro , Hilfiker, Sabine , Hill, Joseph A., Ho, Emmanuel A. , Ho, Idy H. T. , Ho, Philip Wing‐Lok , Ho, Shu‐Leong , Ho, Wan Yun, Hoet, Peter , Hofius, Daniel , Höhn, Annika , Hong, Yi-Ren Hong Chang-Won, Hooper, Lora V. , Hsin, I‐Lun , Hu, Bing , Hu, Dong , Hu, Wei , Hu, Zhuowei , Hua, Jinlian, Huan, Chongmin , Huang, Chuanshu , Huang, Chunling , Huang, Haishan , Huang, Michael , Huang, Shan , Huang, Tianzhi , Huang, Xing , Huang, Yuxiang , Hubert, Virginie , Hübner, Christian A. , Hughes, Stephanie M. , Hughes, William E. , Hummer, Gerhard , Hurley, James H. , Hussain, Sabah N. 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H. , Ma, Ning-Fang, Ma, Quanhong , Ma, Xinliang , Ma, Yueyun , Ma, Zhenyi , MacDougald, Ormond A. , MacIntosh, Gustavo C. , Macleod, Kay F. , Maday, Sandra , Madeo, Frank , Madesh, Muniswamy , Madl, Tobias , Madrigal‐Matute, Julio , Maeda, Akiko, Maejima, Yasuhiro , Magariños, Marta , Mahavadi, Poornima , Maiani, Emiliano , Maiese, Kenneth , Maiti, Panchanan , Maiuri, Maria Chiara , Major, Michael Ben, Makareeva, Elena , Malik, Fayaz , Mallilankaraman, Karthik , Maloyan, Alina , Mammadova, Najiba, Man, Gene Chi Wai , Manai, Federico , Mancias, Joseph D. , Mandelkow, Eva‐Maria , Manfredi, Angelo A. , Manshian, Bella B. , Manzano, Raquel , Marchese, Chiara , Marchetti, Sandrine , Marcucci, F, Mardente, Stefania , Mareninova, Olga A. , Mari, Muriel , Marinelli, Sara , Mariño, Guillermo , Mariotto, Sofia , Martin, Alexandre , Martin, Katie R. , Martin, Sara L. , Martín‐Segura, Adrián , Martin-Burriel, Inmaculada, Martín-Rincón, Marcos , Martín‐Sanz, Paloma , Martinez, Aitor , Martı́nez, Ana , Martinez-Lopez, Nuria, Martínez‐Vicente, Marta , Martins, Daniel Oliveira , Martins, Joilson O. , Martins, Waleska K. , Martins-Marques, Tania, Marzetti, Emanuele , Masaldan, Shashank , Masclaux-Daubresse, Celine, Mashek, Douglas G. , Massa, Valentina , Massieu, Lourdes , Masyuk, Anatoliy I. , Masyuk, Tetyana V., Matheu, Ander , Matoba, Satoaki , Matsuzaki, Sachiko , Mattar, Pamela , Mattè, Alessandro , Mauriz, José L., Mauthe, Mario , Maycotte, Paola , Mayer, Johanna , Mazzoni, Cristina , Mazzulli, Joseph R. , McCarty, Nami , McGill, Mitchell R. , McKenna, Sharon L. , McLoughlin, Fionn , McNiven, Mark A., McWilliams, Thomas G. , Medeiros, Tania , Medina, Diego L., Megeney, Lynn A. , Megyeri, Klára , Mehrpour, Maryam , Mehta, Jawahar L. , Meijer, Alfred J., Mejlvang, Jakob , Meléndez, Alicia , Melk, Annette, Memişoğlu, Gönen , Mendes, A.F. , Meng, Delong , Meng, Fei, Mercier, A., Mergny, Jean‐Louis , Merkley, Seth D. , Meske, Volker, Mestre, Ana Cecilia, Metur, Shree Padma, Meyer, C., Meyer, Hemmo , Mi, Wenyi , Mialet‐Perez, Jeanne , Miao, Jun‐Ying, Micale, Lucia , Miki, Yasuo, Milan, Enrico , Milczarek, Małgorzata , Miller, Samuel I. , Millward, Steven W. , Mirzaei, Hamed, Mirzaei, Hamid Reza , Mirzaei, Mehdi , Mishra, Amit , Mishra, Nandita , Mishra, Paras Kumar, Misirkić, Maja , Misasi, Roberta, Misra, Amit , Misso, Gabriella , Mitchell, Claire H. , Mitou, Géraldine, Miura, Tetsuji , Miyazaki, Makoto, Miyazaki, Mitsunori , Miyazaki, Taiga , Miyazawa, Keisuke, Mizushima, Noboru , Mogensen, Trine H. , Mohammadinejad, Reza , Mohamud, Yasir , Mohanty, Abhishek , Möhlmann, Torsten , Moley, Kelle H. , Möller, Andreas, Mollereau, Bertrand , Mollinedo, Faustino, Montagna, Costanza , Monteiro, Mervyn J. , Montella, Andrea , Montes, L. 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Amer, Ribeiro‐Rodrigues, Teresa , Riccio, Victoria , Richardson, Des R. , Risbud, Makarand V. , Risueño, Ruth M. , Ritis, Konstantinos, Rizza, Salvatore , Rizzuto, Rosario , Roberts, Scott J. , Roberts, Luke D., Robinson, Katherine J. , Rocchi, Stéphane , Rodrigues, Tiago , Silva, Vagner Ramon Rodrigues , Rodriguez-Barrueco, Ruth, Rodríguez‐Henche, Nieves , Rogers, Robert S. , Rogov, Vladimir V., Rojo, Ana I. , Romanello, Vanina, Romani, Luigina , Romano, Alessandra , Romano, Patricia Silvia , Romeo-Guitart, David, Romero, Luís C. , Romero, Montserrat , Roney, Joseph C. , Rongo, Christopher , Rosenfeldt, Mathias T. , Rosenstiel, Philip , Rosenwald, Anne , Roth, Steven, Rouschop, Kasper M.A. , Roussel, Benoit D. , Roux, Sophie , Rovere–Querini, Patrizia, Roy, Ajit , Rozières, Aurore , Ruano, Diego , Rubtsova, Maria P. , Ruckdeschel, Klaus, Ruckenstuhl, Christoph , Rudolf, Emil, Rudolf, Rüdiger, Ruggieri, Alessandra , Ruparelia, Avnika A. , Rusmini, P. , Russell, Ryan R., Russo, Gian Luigi , Russo, Maria , Russo, Rossella , Ryabaya, O. O. , Sabater-Arcis, María , Sacher, M, Sachse, Carsten , Sadhu, Abhishek , Säftig, Paul , Sahebkar, Amirhossein, Şahin, Mustafa , Şahin, Özgür , Saito, Nayuta , Saito, Tsunenori , Sakai, Yasuyoshi , Sakamaki, Jun-Ichi , Saksela, Kalle , Salazar, Gloria , Salazar-Degracia, Anna, Salekdeh, Ghasem Hosseini , Saluja, Ashok K. , Sampaio‐Marques, Belém , Sánchez, Marı́a C. , Sánchez-Alcázar, José A., Sanchez‐Vera, Victoria , Sancho‐Shimizu, Vanessa , Santambrogio, Laura , Santana, Magda M., Santoni, G, Sanz, Alberto , Saran, Shweta , Sardiello, Marco, Sargeant, Timothy J. , Sarin, Apurva , Sarkar, Chinmoy, Sarkar, Sovan , Sarrias, Maria-Rosa, Sarkar, Surajit , Sarmah, Dipanka Tanu, Sarparanta, J. , Sathyanarayan, Aishwarya , Ranganayaki, S. , Scaglione, K. Matthew , Scatozza, Francesca , Schafer, Zachary T. , Schaible, Ulrich E., Schapira, Anthony H.V. , Scharl, Michael , Schein, Catherine H. , Schiaffino, Maria Vittoria , Schiappacassi, Mónica , Schindl, Rainer , Schlattner, Uwe , Schmidt, Oliver, Schmitt, Roland , Schmidt, Stephen D., Schmitz, Ingo , Schmukler, Eran, Schneider, Anja , Schneider, Bianca E. , Schober, Romana , Schoijet, Alejandra C. , Schramm, M., Schröder, Bernd , Schuh, Kai , Schüller, Christoph , Schulze, Ryan J. , Schürmanns, Lea , Schwamborn, Jens C. , Schwarten, Melanie , Scott, Melanie J. , Scotto, Kathleen W., Scrima, Andrea , Scrivo, Aurora , Sebastián, David , Sebti, Salwa , Sedej, Simon , Segev, Nava , Seglen, Per O., Selleck, Scott B. , Selsby, Joshua, Sendtner, Michael , Şentürk, Şerif , Seranova, Elena, Sergi, Consolato M., Serra-Moreno, Ruth , Sesaki, Hiromi , Settembre, Carmine, Setty, Subba Rao Gangi , Sgarbi, Gianluca , Sha, Ou , Shacka, John J., Shah, Javeed A. , Shang, Dantong, Shao, Feng, Sharbati, Soroush , Sharkey, Lisa M. , Sharma, Dipali , Sharma, Gaurav, Sharma, Kulbhushan , Sharma, Pawan , Sharma, Surendra, Shen, Han‐Ming , Shen, Hongtao , Shen, Jiangang , Shen, Ming , Shen, Weili , Shen, Zheni, Sheng, Rui , Sheng, Zu-Hang, Shi, Jianjian , Shi, Ying–Hong , Shiba‐Fukushima, Kahori, Shieh, Jeng‐Jer , Shimada, Yohta , Shimizu, Shigeomi, Shimozawa, Makoto , Shintani, Takahiro , Shoemaker, Christopher J. , Shojaei, Shahla, Shoji, Ikuo , Shravage, Bhupendra V. , Shridhar, Viji, Shu, Chih‐Wen , Shu, Hong-Bing, Shui, Ke, Shukla, Arvind Kumar , Shutt, Timothy E. , Sica, Valentina , Siddiqui, Aleem , Sierra-Torre, Virginia, Signorelli, Santiago , Silva, Bruno Jorge de Andrade , Silva, Johnatas D. , Silva-Pavez, Eduardo , Silvente‐Poirot, Sandrine , Simmonds, Rachel E. , Singh, Anurag K. , Singh, Rajat Kumar , Singh, Shivendra V. , Singh, Shrawan Kumar , Singh, Sudha , Singh, Sunaina , Singh, Surinder Pal , Sinha, Debasish, Sinha, Rohit A. , Sinha, Sangita, Sirko, Agnieszka , Sivridis, Efthimios L., Skendros, Panagiotis , Sohn, Eun Jung , Sok, Sophia P. M. , Soldati, Thierry , Soler, Rosa M. , Somarelli, Jason A. , Sonawane, Avinash , Song, Fuyong, Song, Hyun Kyu , Song, Kunhua , Sorice, Maurizio , Soukas, Alexander A. , Soukup, Sandra‐Fausia , Sousa, Diana , Sousa, Nadia, Bharath, M. M. Srinivas , Clair, Daret St., Stagni, Venturina, Staiano, Leopoldo , Stankov, Metodi V. , Stathopulos, Peter B. , Stefan, Katja, Stefan, Sven Marcel , Stefanis, Leonidas, Steffan, Joan S. , Steinkasserer, Alexander , Stenmark, Harald, Sterneckert, Jared , Stevens, Craig , Storch, Stephan , Strappazzon, Flavie , Strohecker, Anne M. , Stupack, Dwayne G., Su, Huanxing , Su, Ling‐Yan , Suarez-Fontes, Ana Márcia , Subirada, Paula V., Sudhandiran, Ganapasam, Sue, Carolyn M. , Sui, Xinbing , Summers, Corey M., Sun, Guangchao , Sun, Zhongjie , Sunahara, Karen K. S. , Susztak, Katalin, Šutovský, Peter , Suzuki, Hidekazu , Sweeney, Gary , Symons, J. David , Sze, Stephen Cho Wing , Szewczyk, Nathaniel J. , Tabęcka-Łonczynska, Anna, Tabolacci, Claudio , Taegtmeyer, Heinrich, Tagaya, Mitsuo , Tai, Haoran , Tait, Stephen W. G., Takahashi, Yoshinori , Tam, Chit , Tam, Shing Yau , Tampellini, Davide , Tamura, Atsushi , Tan, Eng-King, Tan, Ya‐Qin , Tanaka, Masaki , Tang, Daolin , Tang, Jingfeng , Tang, Tie-Shan , Tao, Zhipeng , Taouis, Mohammed , Tavernarakis, Nektarios, Taylor, Allen, Teixeira, Natércia , Tekirdağ, Kumsal Ayşe, Tencomnao, Tewin , Tenreiro, Sandra , Tharaux, Pierre‐Louis , Thedieck, Kathrin , Thekkinghat, Arvind A. , Thinwa, Josephine , Thirumalaikumar, Venkatesh P. , Thomes, Paul G. , Thorburn, Andrew , Thum, Thomas, Thumm, Michael , Tian, Ling, Tichý, Aleš , Timmerman, Vincent , Titorenko, Vladimir I. , Toivonen, Janne M. , Tomaipitinca, Luana , Tomar, Dhanendra , Tomás‐Zapico, Cristina , Tomić, Sergej , Tong, Chao, Tong, Xin , Torgersen, Maria L., Torii, Satoru , Torres-López, Liliana , Torriglia, Alicia , Towers, Christina G. , Towns, Roberto, Tran, Quynh‐Giao , Travassos, Leonardo H. , Tremel, Shirley , Trougakos, Ioannis P., Tsao, Betty P. , Tse, Tak Fu, Tsvetkov, Andrey S. , Tumbarello, David A. , Tyler, Jessica K., Tyutereva, Elena V. , Uchiyama, Yasuo , Ugun‐Klusek, Aslihan , Uhlig, Holm H. , Ułamek-Kozioł, Marzena, Ulasov, Ilya V. , Umekawa, Midori, Ungermann, Christian , Urbe, Sylvie, Uribe-Carretero, Elisabet , Uversky, Vladimir N. , Vaccaro, María I. , Vahsen, Björn F. , Vakifahmetoglu-Norberg, Helin, Valdor, Rut , Valente, Maria João , Valko, Ayelén , Vallée, Richard, Valverde, Ángela M. , Berghe, Greet Van den, Veen, Stijn van der , Kaer, Luc Van , Loosdregt, Jorg van , Wijk, Sjoerd J. L. van , Vandenberghe, Wim , Vanhorebeek, Ilse , Vannier-Santos, Marcos A., Vannini, Nicola , Vanrell, M. Cristina, Vantaggiato, Chiara , Varela‐Nieto, Isabel , Varga, Máté , Vasconcelos, M. Helena , Vats, Somya , Vega-Rubín-de-Celis, Silvia , Velasco, Guillermo , Velázquez, Ariadna P., Vellai, Tibor , Vellenga, Edo , Verdier, Mireille , Verginis, Panayotis , Vergne, Isabelle , Verkade, Paul , Verma, Manish , Verstreken, Patrik , Vervliet, Tim , Vervoorts, Jörg , Víctor, Víctor M., Vidoni, Chiara , Vieira, Otília V. , Vierstra, Richard D., Viganò, Sonia , Vihinen, Helena , Vijayan, Vinoy, Vila, Miquel , Villalba, José M., Villalobo, Antonio , Villarejo‐Zori, Beatriz , Vincent, Olivier , Vindis, Cécile , Viret, Christophe , Vocadlo, David J. , Voitsekhovskaja, Olga V. , Volonté, Cinzia , Volta, Mattia , Vomero, Marta , Haefen, Clarissa von, Vooijs, Marc , Voos, Wolfgang , Vučićević, Ljubica , Waguri, Satoshi , Waite, Kenrick A., Wakatsuki, Shuji , Walker, David W., Walker, Mark J. , Walter, Jochen, Wandosell, Francisco , Wang, Bo , Wang, Chao-Yung, Wang, Chen , Wang, Chenran, Wang, Chenwei , Wang, Cun-Yu, Wang, Fengming, Wang, Han, Wang, Hexiang , Wang, Hong‐Gang , Wang, Jianrong, Wang, Jigang , Wang, Jun-Dong , Wang, Kui , Wang, Lianrong, Wang, Liming , Wang, Maggie Haitian, Wang, Meiqing , Wang, Nanbu , Wang, Pengwei , Wang, Ping , Wang, Ping, Wang, Q., Wang, Qiong , Wang, Wentao , Wang, Xinnan, Wang, Xuejun , Wang, Yan, Wang, Yanchang , Wang, Yanzhuang , Wang, Yihua , Wang, Yu , Wang, Yuqi , Wang, Zhe, Wang, Zhenyu , Wang, Zhouguang , Watanabe, Eizo, Watchon, Maxinne , Wawrzyńska, Anna , Weaver, Timothy E., Węgrzyn, Grzegorz, Wehman, Ann M. , Wei, Huafeng , Wei, Taotao , Wei, Yongjie, Weiergräber, Oliver H. , Weihl, Conrad C., Weindl, Günther , Weiskirchen, Ralf , Wen, Runxia H. , Werner, Antonia, Weykopf, Beatrice , Whitton, J. Lindsay , Wiktorska, Katarzyna , Wildenberg, Manon E. , Wileman, Tom, Wilkinson, Simon , Williams, Brett, Williams, Robin S. B. , Williamson, Peter R. , Wilson, Richard A. , Winsor, Nathaniel J. , Wodrich, Harald , Woehlbier, Ute , Wollert, Thomas , Wong, Richard W., Wong, Vincent Kam Wai , Wong, W. Wei-Lynn, Wu, Anguo , Wu, Kenneth K., Wu, Shan‐Ying , Wu, William Ka Kei , Wu, Shufang, Wu, Xiaoqing , Wu, Yao‐Wen , Wu, Yihua , Xavier, Ramnik J. , Xia, Hongguang , Xia, Lixin , Xia, Zhengyuan , Ge, Xiang , Xiang, Jin , Xiang, Mingliang , Xiang, Wei , Xiao, Guozhi , Xiao, Hengyi , Xiao, Hongtao , Xiao, Jian, Xiao, Lan , Xiao, Shi , Xiao, Yin , Xie, Baoming, Xie, Zhiping , Xie, Min , Xie, Yuxiang , Xie, Zhonglin, Xilouri, Maria , Xu, En , Xu, Jin‐Rong , Xu, Liang , Xu, Xiulong , Xue, Yu , Yakhine-Diop, Sokhna M. S. , Yamaguchi, Masamitsu , Yamamoto, Ai , Yamashina, Shunhei, Yan, Shengmin , Yan, Shian-Jang, Yan, Zhen , Yang, Chuanbin , Yang, Dun-Sheng, Yang, Huan , Yang, Huang-Tian, Yang, Hui , Yang, Jing , Yang, Jingyu , Yang, Ling , Liu, Yang , Yang, Ming , Yang, Seungwon, Yang, Shu , Yang, Shun-Fa , Yang, Wannian, Yang, Wei , Yang, Xiaoyong , Yang, Yi , Yao, Xiaoqiang , Yao, Yong-Gang , Yao, Yong-ming, Yasui, Takahiro , Yazdankhah, Meysam, Yi, Cong , Yin, Xiao-Ming , Yin, Yanhai , Yin, Zhangyuan , Yin, Ziyi , Ying, Meidan , Ying, Zheng, Yip, Calvin K. , Yiu, Stephanie Pei Tung , Yoo, Young Hyun , Yoshimori, Tamotsu, Yousefi, Bahman, Yu, Boxuan , Yu, Haiyang , Yu, Jun, Li, Yu , Yu, Ming‐Lung , Yu, Seong-Woon, Yu, Victor C. , Yu, Zhengping, Yuan, Junying , Yuan, Ling‐Qing , Yuan, Shilin , Yuan, Yanggang , Yuan, Zengqiang , Yue, Jianbo , Yue, Zhenyu , Yung, Raymond , Zacks, David, Zaffagnini, Gabriele , Zambelli, Vanessa O. , Zanella, Isabella , Zang, Qun S. , Zanivan, Sara , Zappavigna, Silvia , Zaragoza, P. , Zarbalis, Konstantinos S., Zarebkohan, Amir , Zarrouk, Amira , Zeitlin, Scott, Zeng, Jialiu , Zeng, Judeng , Žerovnik, Eva , Zhan, Lixuan , Zhang, Donna D., Zhang, Hong , Zhang, Honghe , Zhang, Huafeng , Zhang, Huaye, Zhang, Huiling , Zhang, Jianbin , Zhang, Jingpu , Zhang, Kalin Yanbo , Zhang, Leshuai W. , Zhang, Lu , Zhang, Luoying , Zhang, Menghuan, Zhang, Peng , Zhang, Sheng , Zhang, Xiangnan, Zhang, Xiao-Wei, Zhang, Xiaolei , Zhang, Xiaoyan , Zhang, Xin , Zhang, Xinxin , Zhang, Yang, Zhang, Yi , Zhang, Yingdong , Zhang, Yuanyuan , Zhang, Yuchen , Zhang, Zhe , Zhang, Zhibing , Zhang, Zili , Zhao, Haobin, Zhao, Lei , Zhao, Shuang , Zhao, Tongbiao , Zhao, Ying, Zhao, Yongchao , Zhao, Yongliang , Zhao, Yuting , Zheng, Guoping , Zheng, Kai, Zheng, Ling , Zheng, Shizhong , Zheng, Xi‐Long , Zheng, Zu‐Guo , Zhivotovsky, Boris, Zhong, Qing , Zhou, Ao, Zhou, Ben , Zhou, Cefan , Zhou, Gang , Zhou, Hongbo , Zhou, Kailiang, Zhou, Rongjia , Zhou, Yanshuang, Zhou, Yinghong , Zhou, Yubin , Zhou, Zhengyu, Zhou, Zhou , Zhu, Binglin , Zhu, Changlian , Zhu, Guo‐Qing , Zhu, Haining , Zhu, Hongxin, Zhu, Yanping , Zhu, Yushan , Zhuang, Haixia , Zhuang, Xiaohong , Zimmermann, Christine , Żołądek, Teresa , Zong, Wei‐Xing, Zorov, Dmitry B. , Zorzano, Antonio, Zou, Weiping, Zou, Zhen , Zou, Zhengzhi, Zuryn, Steven , Kenchappa, Chandra Shekar, Li, Zuguo , Lin, Yong , Sluimer, Judith C. , Stallings, Christina L. , Tong, Chun-Kit, Wang, Ping , Hu, Bo , Lee, Edward B. , Tse, Hung‐Fat , Suszták, Katalin , Lei, Yu Leo , Yu, M-L , Dai, Yun , Bartolome, Alberto , Brown, Rhoderick E , Passos, João F , Paneni, Francesco , Sahin, Özgür , Pereira de Almeida, Luis , Ren, Jun , Bornhauser, Beat , Kumar, Sharad , Sampaio-Marques, Belém , Ludovico, Paula , Luftig, Micah , Begun, Jakob , Krasnodembskaya, Anna D , Dafsari, Hormos Salimi , Chevet, Eric , Tse, Hung-Fat , Barmada, Sami , Ebrahimi-Fakhari, Darius , Cavadas, Claudia , Sue, Carolyn M , Cardenal-Muñoz, Elena , Lee, Edward B , Golebiewska, Anna , Calbet, Jose A L , Boya, Patricia , Maday, Sandra , Klionsky, Daniel J. , Abdelfatah, Sara , Abdoli, Asghar , Agarwal, Anupam , Ahmed, Zubair M. , Alcocer‐Gómez, Elísabet , Ali, Muhammad , Al‐Bari, Md. Abdul Alim , Aliwaini, Saeb H. , Alizadeh, Javad , Almacellas, Eugènia , Almasan, Alexandru , Alonso, G. , Altieri, Dario C. , Andersen, Stig Uggerhøj , Andrade-Silva, Magaiver , Angelini, Sabrina , Apostolova, Nadezda , Arasaki, Kohei , Araújo, Wagner L. , Arden, Catherine , Arimoto, Hirokazu , Armstrong-James, Darius P. H. , Pelloquin, Laetitia , Aschner, Michael , Ashrafizadeh, Milad , Autelli, Riccardo , Aveic, Sanja , Avin‐Wittenberg, Tamar , Ayton, Scott , Backues, Steven K. , Bae, Dong-Hun , Bae, Ok‐Nam , Baek, Ahruem , Baek, Seung‐Hoon , Baek, Sung Hee , Bai, Jie , Bai, Yidong , Baldari, Cosima T. , Balduini, Walter , Ballabio, Andrea , Banerjee, Sreeparna , Bao, Yan , Baptista, Maurı́cio S. , Barreto, George Emilio , Basagoudanavar, Suresh H. , Bast, Robert C. , Basu, Alakananda , Batoko, Henri , Batten, Isabella , Behrens, Georg M. N. , Bei, Roberto , Behl, Christian , Bello‐Morales, Raquel , Beltrán, Sebastián , Bergami, Matteo , Bergmann, Andreas , Berthoux, Lionel , Bhattacharya, Resham , Bhattacharyya, Shalmoli , Bhutia, Sujit Kumar , Bi, Lanrong , Birgisdottir, Åsa Birna , Bjørkøy, Geir , Blomgren, Klas , Boada-Romero, Emilio , Boesze‐Battaglia, Kathleen , Bonifacino, Juan S. , Boone, Brian A. , Borthakur, Gautam , Bosch, Jürgen , Bose, Santanu , Botana, Luis Miguel , Boulton, Michael E. , Bourdenx, Mathieu , Brackney, Doug E. , Brandts, Christian , Braun, Ralf J. , Braus, Gerhard H. , Bravo, Roberto , Brody, Steven L. , Brown, Carolyn Nicole , Brumell, John Hunter , Brunetti‐Pierri, Nicola , Buitrago‐Molina, Laura Elisa , Buraschi, Simone , Buch, Shilpa J. , Butturini, Elena , Cairó, Montserrat , Caldwell, Kim A. , Campbell‐Valois, François‐Xavier , Campello, Silvia , Campesi, Ilaria , Almeida, Danilo Cândido de , Canesi, Laura , Caraglia, Michele , Carchman, Evie H. , Carmona‐Gutiérrez, Didac , Carnevali, Oliana , Carrier, Lucie , Carroll, Bernadette , Carter, A. Brent , Casas, Caty , Castillo, Eliseo F. , Castro‐Caldas, Margarida , Castro‐Obregón, Susana , Catz, Sergio , Cayuela, María Luisa , Cecarini, Valentina , Cecconi, Francesco , Cenci, Simone , Ceperuelo‐Mallafré, Victòria , Cervia, Davide , Chae, Han–Jung , Chakrabarti, Oishee , Chan, Edmond Y. W., Chan, Edward D. , Chandra, Partha Kumar , Chang, Chih‐Peng , Chang, Chunmei , Chapman, Tracey , Chen, Guang‐Chao , Chen, Leilei , Chen, Lin , Chen, Quan , Chen, Ruey‐Hwa , Chen, Shi , Chen, Wei‐Qiang , Chen, Xu , Chen, Yu-Jen , Chen, Yujie , Chen, Zhi , Chen, Zhijian J. , Chen, Zhixiang , Cheng, Hanhua , Cheng, Jun , Cheng, Shi‐Yuan , Cheng, Wei Nee , Cheng, Xiaodong , Chen, Zhong , Cheong, Heesun , Chernyak, Boris V. , Chi, Richard J., Chiang, Aks , Chiarelli, Roberto , Chu, Charleen T. , Chung, Seockhoon , Cianfanelli, Valentina , Cifuentes, Mariana , Cirone, Mara , Clague, Michael J. , Cohen, Ehud , Cohen, Mickaël M. , Čolić, Miodrag J , Combaret, Lydie , Comincini, Sergio , Conte, Andrea, Conti, Fabrizio , Coppens, Isabelle , Corasaniti, Maria Tiziana , Corkery, Dale , Cordes, Nils , Cortese, Katia , Coto‐Montes, Ana M. , Crack, Peter John , Crespo, José L. , Cuadrado, Antonio , Cui, Jun , Cui, Yong , D’Arcangelo, Daniela , D’Lugos, Andrew C. , Dagda, Ruben Karim , Dagdas, Yasin , Daμμe, Markus , Dantuma, Nico P. , Darling, April L. , Dasarathy, Srinivasan , Daumke, Oliver , Davis, Tanja , Amicis, Francesca De , Felice, Francesca De , Franceschi, Lucia De , Milito, Angelo De , Nunzio, Cosimo De , Santi, Mauro De , Debnath, Jayanta , DeBosch, Brian J. , DeGregori, James V. , Rio, Gabriel del , Delbridge, Lea M.D. , Delpino, M. Victoria , Demarchi, Francesca , Dembitz, Vilma , Deng, Zhiqiang , Denton, Donna , Der, Channing J , Deretić, Vojo , Dhiman, Rohan , Bernardo, Diego di , Cristina, Manlio Di , Nardo, Alessia Di, Sano, Federica Di , Diallinas, George , Diaz-Araya, Guillermo, Đikić, Ivan , Ding, Wen‐Xing , Dini, Luciana , Dionne, Marc , Diwan, Abhinav , Dixon, Ian , Djavaheri‐Mergny, Mojgan , Dobrinski, Ina , Dobrovinskaya, Oxana R. , Dobrowolski, Radek , Dobson, Renwick C. J. , Donadelli, Massimo , Dong, Bo, Dötsch, Volker , Dou, Huan , Dridi, Sami , Du, Caigan , Du, Li‐Lin , Dubrovska, Anna , Dunlop, Elaine A. , Dwarakanath, Bilikere Srinivasa Rao , Eftekharpour, Eftekhar , Eichinger, Ludwig , Eissa, N. Tony , Eissa, Sanaa , El‐Naggar, Shahenda , Eliopoulos, Aristides G. , Elks, Philip M. , Emerling, Brooke M. , Engelbrecht, Anna‐Mart , Escobar‐Henriques, Mafalda , Fabriàs, Gemma , Fabrizi, Cinzia , Falkenburger, Björn H. , Fan, Yanbo , Fanto, Manolis , Feng, Du , Feng, Yibin , Feng, Yuchen , Fernández-Checa, José Carlos , Filippi‐Chiela, Eduardo Cremonese , Filomeni, Giuseppe , Fineschi, Vittorio , Flamigni, Flavio , Follo, Carlo , Fon, Edward A , Fornai, Francesco , Fraldi, Alessandro , Franco, Brunella , Franco, Rodrigo , Friedman, Scott L. , Frühbeck, Gema , Fujita, Naonobu , Fujiwara, Yuuki , Fukuda, Mitsunori , Furic, Luc , Fusco, Carmela , Galluzzi, Lorenzo, Gan, Boyi , Gao, Hui , Gao, Shou‐Jiang , Gargini, Ricardo , Garry, Robert F. , Ge, Liang , Ge, Wanzhong , Gelfi, Cecilia , Gentle, Ian Edward , Gewirtz, David A , Ghigo, Alessandra , Giampietri, Claudia , Gibson, Spencer B. , Giniger, Edward , Giorgi, Carlotta , Girão, Henrique , Goldstone, David C. , Gomez‐Puerto, Maria Catalina , Goñi, Félix M. , González‐Hernández, Tomás , Gorbatyuk, Marina S. , Goruppi, Sandro , Gottlieb, Roberta A. , Gozes, Illana , Green, Douglas R. , Grinstaff, Mark W. , Grune, Tilman , Guntur, Anyonya R. , Guo, Lian‐Wang , Gupta, Shashi Kumar , Gustafsson, Åsa B. , Haapasalo, Annakaisa , Hadano, Shinji , Hafrén, Anders , Hall, Belinda S. , Hamann, Andréa , Han, Weidong , Hanson, Phyllis I. , Haroon, Nigil , Harris, James , Hasegawa, Takafumi , Nagoor, Noor Hasima , Hay, Bruce A. , Hayrabedyan, Soren , He, Yu‐Ying , Helgason, G. Vignir , Hergovich, Alexander , Hernández–Gea, Virginia , Heussler, Volker Theo , Hlavacek, William S. , Hobbs, G. Aaron , Hochstrasser, Mark , Hofman, Paul , Holmberg, Carina I. , Hombrebueno, José R. , Hoppe, Thorsten , Horos, Rastislav , Hoshida, Yujin , Hsu, Hsin‐Yun , Hu, Li‐Fang , Hu, Ming Chang , Hu, Ronggui , Hu, Yu‐Chen , Hua, Fang , Hua, Jinlian, Hua, Yingqi , Huang, Canhua , Huang, Chuanxin , Huang, Kun , Huang, Rui , Huber, Tobias Bruno , Humbert, Magali , Hussey, Patrick J. , Hwang, Hui‐Yun , Hwang, Seungmin , Imai, Yuzuru , Iovanna, Juan , Ippolito, Giuseppe , Irazoqui, Javier E. , Ishaq, Mohd, Ishikawa, Makoto , Isidoro, Ciro , Izumi, Masanori , Jäättelä, Marja , Jabir, Majid Sakhi , Jackson, William T. , Jacomin, Anne‐Claire , Jakobi, Arjen J. , Jantsch, Jonathan , Jassey, Alagie , Jean, Steve , Jendelová, Pavla , Jewell, Jenna L. , Ji, Jing , Jiang, Liwen , Jin, Eun‐Jung , Jin, Hongchuan , Jin, Meiyan , Jo, Eun‐Kyeong , Johansen, Terje , Johnson, Gail V.W. , Jolly, Mohit Kumar , Joosten, Leo A. B. , Jordán, Joaquı́n , Joseph, Bertrand , Ju, Dianwen , Ju, Jeong-Sun , Ju, Jingfang , Judith, Delphine , Jung, Yong‐Keun , Kaarniranta, Kai , Kabuta, Tomohiro , Kahana, Alon , Kaminskyy, Vitaliy O. , Kanasaki, Keizo , Kanthasamy, Anumantha G. , Karamouzis, Michalis V. , Karmakar, Parimal , Katare, Rajesh , Kaufmann, Stefan H. E. , Kaushik, Susmita , Kawasaki, Kiyoshi, Ke, Po‐Yuan , Keating, Damien J. , Kehrl, John H. , Keller, Christian W. , Kemper, Jongsook Kim , Kermorgant, Stéphanie , Ketteler, Robin , Khambu, Bilon , Kim, Deok Ryong, Kim, Eun Young , Kim, Jin Kyung , Kim, Jin‐Hoi , Kim, Ju Hwan , Kim, Keun Il , Kim, Peter Kijun , Kinghorn, Kerri J. , Kirkin, Vladimir , Киселев, С. Л. , Kittler, Josef T. , Knorr, Roland L. , Ko, Ben C.B. , Ko, Jiunn‐Liang , Kobayashi, Hotaka , Koenig, Ulrich , Koike, Masato , Kohlwein, Sepp Dieter , Komatsu, Masaaki , Kopp, Benjamin T. , Korcsmaros, Tamas Douglas , Korolchuk, Viktor I. , Kotler, Mónica L. , Koukourakis, Michael Ioannis , Kovács, Tibor, Koya, Daisuke , Kozako, Tomohiro , Krämer, Helmut , Kroemer, Guido , Ktistakis, Nicholas T. , Kuchitsu, Kazuyuki , Kumar, Ashok , Kumar, Deepak, Kundu, Mondira , Kurgan, Lukasz , Kutateladze, Tatiana G. , Kwon, Ho Jeong , Kwon, Taeg Kyu , Kyrmizi, Irene , Spada, Albert R. 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G.
Autophagy | March 24, 2021 | Volume: 17 | Issue: 1 | Pages: 1-382
Direct lysosome-based autophagy of lipid droplets in hepatocytes
Schulze, Ryan J. , Krueger, Eugene W. , Weller, Shaun G. , Johnson, Katherine M. , Schott, Micah B. , McNiven, Mark A. , Schott, Micah B , Johnson, Katherine M., Casey, Carol A.
Proceedings of the National Academy of Sciences | December 7, 2020 | Volume: 117 | Issue: 51 | Pages: 32443-32452
Significance Lipid droplets (LDs) are specialized fat-storage organelles that can be used as a fuel source by many types of cells when nutrients are scarce. One mechanism used by hepatocytes (the functional cells of the liver) for the catabolism of these energy reserves is the lysosome-directed process of autophagy. Traditionally, autophagy necessitates the enclosure of cargo within a double-membrane autophagosome before delivery to the lysosome for degradation. Here, we use live-cell and electron microscopy to demonstrate that stable contacts between LDs and lysosomes in hepatocytes can result in the transfer of both proteins and lipids from LDs directly into the lysosome in the absence of an autophagosomal intermediate. These findings reveal a mechanism used for lipid homeostasis in the liver.
Lipid droplet degradation through a novel and direct engulfment by endo‐lysosomes
Mehall, Bridget, Weller, Shaun G. , McNiven, Mark A. , Schott, Micah B. , Schulze, Ryan J.
The FASEB Journal | April 19, 2020 | Volume: 34 | Issue: S1 | Pages: 1-1
10.1096/fasebj.2020.34.s1.08730
Lipid droplets (LDs) are fat‐storage organelles that play critical roles in energy homeostasis, but can excessively accumulate in metabolic diseases such as obesity and fatty liver where hepatocytes become grossly engorged with excess lipid. The catabolism of LDs aids in disease resolution and occurs in part by lipophagy, a form of selective autophagy, but the molecular and vesicle trafficking events that facilitate this process are not fully understood. During lipophagy, autophagosomes are thought to target LDs prior to fusion with acidic lysosomes, where neutral lipids are terminally degraded by lysosomal acid lipase. Ultrastructural viewing of hepatocytes showing LDs contained within electron‐dense acidic vesicles is consistent with this concept. In addition to canonical autophagy, we find that most LDs undergoing degradation are encased within single‐membrane endo‐lysosomes, and few LDs are observed within traditional double‐membrane autophagosomes. Further, studies of LD catabolism in yeast have shown that LDs can be directly internalized by the large acidic vacuole through a process known as microlipophagy. Thus, the GOAL of this study was to test if similar microlipophagy mechanisms occur in mammalian cells such as hepatocytes, and whether this process involves autophagy. METHODS To test this, we used microscopic fatty acid tracing studies and time‐lapse confocal microscopy to determine the role of autophagosomes versus endo‐lysosomes in LD catabolism. To trace the fate of LDs into terminal degradative vesicles, cells were first loaded with the fluorescent lipid marker Bodipy C12, then treated for 24h with LAListat, an inhibitor of lysosomal acid lipase. RESULTS We observed a ~5‐fold higher incidence of LDs within endo‐lysosomes (marked with the tetraspanin CD63), compared with autophagosomes (marked by the autophagy protein LC3). Furthermore, siRNA knockdown of macroautophagy proteins (Atg5, Atg7, and Fip200) did not inhibit LD internalization by endo‐lysosomes, suggesting that autophagy is not a prerequisite for this process. In addition, time‐lapse microscopy revealed a direct internalization of cytosolic LDs by endo‐lysosomes positive for lysotracker or CD63‐mCherry. CONCLUSION These findings suggest that hepatocytes utilize a distinct form of microautophagy that entails the direct envelopment of cytoplasmic LDs by endocytic vesicles such as multivesicular bodies and lysosomes/late endosomes. In addition to lipolysis and canonical macroautophagy, this process plays an important role in the catabolic utilization of LDs by the hepatocyte. Support or Funding Information This study was supported by NIH R01DK044650 (to M.A.M.), RO1AA020735 (to M.A.M.), and the K99AA020735 (to M.B.S.).
Abstract PR09: KRas modulates pancreatic cancer cell metabolism and invasive potential through the lipase HSL
Rozeveld, Cody N., Zhang, Lizhi , Schulze, Ryan J. , Razidlo, Gina L.
Cancer Research | March 26, 2020 | Volume: 79 | Issue: 24_Supplement | Pages: PR09-PR09
10.1158/1538-7445.panca19-pr09
Abstract Pancreatic ductal adenocarcinoma (PDAC) has a 5-year survival rate of only 9%, due in part to its robust metastatic capability. Metastatic invasion is a particularly energy-intensive cellular process; thus, novel therapeutic strategies could include targeting the energy source for tumor cell invasion and migration. Excess lipids, present due to increased fatty acid synthesis or obesity, could provide a fuel source for cancer progression and metastasis. Neutral lipids are stored in organelles called lipid droplets (LDs). How LDs contribute to PDAC tumor cell invasion and metastasis remains unknown. We hypothesize that PDAC cells can store excess lipid to drive metastatic invasion. Indeed, introduction of excess exogenous fatty acids augments LD production and accumulation in PDAC cells and leads to enhanced PDAC cell motility and invasion in vitro. LDs are metabolized by the concerted action of lipases. Importantly, we have found that treatment of tumor cells with lipase inhibitors blocks tumor cell invasion, indicating that utilization of stored lipids via lipase-mediated LD breakdown is required for invasive migration. Hormone sensitive lipase (HSL) is a lipolytic enzyme, best characterized in adipose tissue, that is critical to the breakdown and utilization of LDs in vitro and in vivo. We have made the surprising observation that oncogenic KRas downregulates expression of HSL in pancreatic cancer cells, which shifts the cells towards lipid storage. In PDAC, mutational activation of the oncogene KRas occurs in 95% of tumors and contributes to metabolic rewiring of tumor cells. Our data suggest that the metabolic shift induced by mutant KRas is comprised of decreased LD utilization via downregulation of HSL. Indeed, re-expression of HSL shifts tumor cell metabolism towards elevated oxidative phosphorylation. Importantly, KRas-mutant cells still require the catalytic activity of HSL for tumor cell invasion, even though HSL expression is downregulated. Using redox ratio imaging, we have found that migratory cells selectively utilize oxidative phosphorylation during the process of migration to metabolize stored lipid droplets and fuel invasive migration. Finally, depletion of LD stores via overexpression of HSL blocks tumor cell invasion in vitro and metastasis in mice, even in the context of oncogenic KRas. These data indicate that regulation of HSL is important for both lipid storage and maintaining cancer cell invasiveness. Therefore, we propose a novel mechanism by which oncogenic KRas mediates HSL activity in a tunable manner, thereby altering the metabolism of PDAC cells and leading to increased metastatic ability. This abstract is also being presented as Poster B47. Citation Format: Cody Rozeveld, Ryan Schulze, Lizhi Zhang, Gina L Razidlo. KRas modulates pancreatic cancer cell metabolism and invasive potential through the lipase HSL [abstract]. In: Proceedings of the AACR Special Conference on Pancreatic Cancer: Advances in Science and Clinical Care; 2019 Sept 6-9; Boston, MA. Philadelphia (PA): AACR; Cancer Res 2019;79(24 Suppl):Abstract nr PR09.
Lipid droplet size directs lipolysis and lipophagy catabolism in hepatocytes
Schott, Micah B. , Weller, Shaun G. , Schulze, Ryan J. , Krueger, Eugene W. , Drizyte‐Miller, Kristina , Casey, Carol A. , McNiven, Mark A. , Casey, Carol A , Schott, Micah B , Drizyte-Miller, Kristina
Journal of Cell Biology | August 7, 2019 | Volume: 218 | Issue: 10 | Pages: 3320-3335
Lipid droplet (LD) catabolism in hepatocytes is mediated by a combination of lipolysis and a selective autophagic mechanism called lipophagy, but the relative contributions of these seemingly distinct pathways remain unclear. We find that inhibition of lipolysis, lipophagy, or both resulted in similar overall LD content but dramatic differences in LD morphology. Inhibition of the lipolysis enzyme adipose triglyceride lipase (ATGL) resulted in large cytoplasmic LDs, whereas lysosomal inhibition caused the accumulation of numerous small LDs within the cytoplasm and degradative acidic vesicles. Combined inhibition of ATGL and LAL resulted in large LDs, suggesting that lipolysis targets these LDs upstream of lipophagy. Consistent with this, ATGL was enriched in larger-sized LDs, whereas lipophagic vesicles were restricted to small LDs as revealed by immunofluorescence, electron microscopy, and Western blot of size-separated LDs. These findings provide new evidence indicating a synergistic relationship whereby lipolysis targets larger-sized LDs to produce both size-reduced and nascently synthesized small LDs that are amenable for lipophagic internalization.