Citations

When consumed separately, whey protein (WP) is more rapidly absorbed into circulation than casein (Cas), which prompted the concept of rapid and slow dietary protein. It is unclear whether these proteins have similar metabolic fates when coingested as in milk. We determined the rate of appearance across the splanchnic bed and the rate of disappearance across the leg of phenylalanine (Phe) from coingested, intrinsically labeled WP and Cas. Either [15N]Phe or [13C- ring C6]Phe was infused in lactating cows, and the labeled WP and Cas from their milk were collected. To determine the fate of Phe derived from different protein sources, 18 healthy participants were studied after ingestion of one of the following: 1) [15N]WP, [13C]Cas, and lactose; 2) [13C]WP, [15N]Cas, and lactose; 3) lactose alone. At 80–120 min, the rates of appearance (Ra) across the splanchnic bed of Phe from WP and Cas were similar [0.068 ± 0.010 vs. 0.070 ± 0.009%/min; not significant (ns)]. At time 220–260 min, Phe appearance from WP had slowed (0.039 ± 0.008%/min, P < 0.05) whereas Phe appearance from Cas was sustained (0.068 ± 0.013%/min). Similarly, accretion rates across the leg of Phe absorbed from WP and Cas were not different at 80–120 min (0.011 ± 0.002 vs. 0.012 ± 0.003%/min; ns), but they were significantly lower for WP (0.007 ± 0.002%/min) at 220–260 min than for Cas (0.013 ± 0.002%/min) at 220–260 min. Early after meal ingestion, amino acid absorption and retention across the leg were similar for WP and Cas, but as rates for WP waned, absorption and assimilation into skeletal muscle were better retained for Cas.

Abstract It is believed that multiple genetic variants with small individual effects contribute to the risk of alcohol dependence. Such polygenic effects are difficult to detect in genome-wide association studies that test for association of the phenotype with each single nucleotide polymorphism (SNP) individually. To overcome this challenge, gene-set analysis (GSA) methods that jointly test for the effects of pre-defined groups of genes have been proposed. Rather than testing for association between the phenotype and individual SNPs, these analyses evaluate the global evidence of association with a set of related genes enabling the identification of cellular or molecular pathways or biological processes that play a role in development of the disease. It is hoped that by aggregating the evidence of association for all available SNPs in a group of related genes, these approaches will have enhanced power to detect genetic associations with complex traits. We performed GSA using data from a genome-wide study of 1165 alcohol-dependent cases and 1379 controls from the Study of Addiction: Genetics and Environment (SAGE), for all 200 pathways listed in the Kyoto Encyclopedia of Genes and Genomes (KEGG) database. Results demonstrated a potential role of the ‘synthesis and degradation of ketone bodies’ pathway. Our results also support the potential involvement of the ‘neuroactive ligand–receptor interaction’ pathway, which has previously been implicated in addictive disorders. These findings demonstrate the utility of GSA in the study of complex disease, and suggest specific directions for further research into the genetic architecture of alcohol dependence.

Abstract Over the last two decades, our understanding of the pathogenesis of central line associated blood steam infections has improved significantly. Also, increased attention has been focused on reducing healthcare worker exposure to infectious agents. Best practice protocols have been developed to eliminate unnecessary morbidity, mortality and costs associated with these infections and exposures. Adoption of these best practices has been incomplete and non-compliance is a major factor preventing our infectious complication rates from reaching zero. Getting at the root cause of noncompliance is complex. Online surveys are uniquely positioned to help understand the human factors contributing to non-compliance. This article reviews some of the pros and cons associated with the use of online surveys. Using several relevant recent examples, this article explores how these surveys can be used to identify those factors that create barriers to compliance. By better understanding all the issues involved with non-compliance, we will be able to create strategies and engineer products to improve best practice protocol compliance and reduce the human factor contribution to our patient's infectious complications.

ABSTRACT Underlying mechanisms of individual variation in severity of influenza infection and response to vaccination are poorly understood. We investigated the effect of reduced heme oxygenase‐1 (HO‐1) expression on vaccine response and outcome of influenza infection. HO‐1‐deficient and wild‐type (WT) mice (kingdom, Animalia; phylum, Chordata; genus/species, Mus musculus ) were infected with influenza virus A/PR/8/34 with or without prior vaccination with an adeno‐viral‐based influenza vaccine. A genome‐wide association study evaluated the expression of single‐nucleotide polymorphisms (SNPs) in the HO‐1 gene and the response to influenza vaccination in healthy humans. HO‐1‐deficient mice had decreased survival after influenza infection compared to WT mice (median survival 5.5 vs. 6.5 d, P =0.016). HO‐1‐deficient mice had impaired production of antibody following influenza vaccination compared to WT mice (mean antibody titer 869 vs. 1698, P =0.02). One SNP in HO‐1 and one SNP in the constitutively expressed isoform HO‐2 were independently associated with decreased antibody production after influenza vaccination in healthy human volunteers ( P =0.017 and 0.014, respectively). HO‐1 deficient mice were paired with sex‐ and age‐matched WT controls. HO‐1 affects the immune response to both influenza infection and vaccination, suggesting that therapeutic induction of HO‐1 expression may represent a novel adjuvant to enhance influenza vaccine effectiveness.—Cummins, N. W., Weaver, E. A., May, S. M., Croatt, A. J., Foreman, O., Kennedy, R. B., Poland, G. A., Barry, M. A., Nath, K. A., Badley, A. D. Heme oxygenase‐1 regulates the immune response to influenza virus infection and vaccination in aged mice. FASEB J. 26, 2911–2918 (2012). www.fasebj.org