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Glutamine suppresses Hsp72 not Hsp90α and is not inducing Th1, Th2, or Th17 cytokine responses in human septic PBMCs. | LitMetric

AI Article Synopsis

Article Abstract

Objective: L-Alanyl-glutamine (L-Ala-Gln) is a pharmaco-nutrient commonly used in nutrition regimens due to its immunomodulatory effects. In critically ill patients who are septic, L-Ala-Gln was associated with an increase in mortality. The aim of this study was to investigate whether L-Ala-Gln modulated heat shock protein (Hsp)-72, 90-α, T helper (Th)1, Th2, and Th17 cytokine expression in the peripheral blood mononuclear cells (PBMC) of patients with severe sepsis.

Methods: Time-dose effects of L-Ala-Gln were compared with those of L-glutamine (L-Gln) and lipopolysaccharide (LPS) and to healthy controls. PBMCs were incubated with 1 or 10 μg/mL LPS, 5 or 10 mM L-Gln, and 5 or 10 mM L-Ala-Gln for different periods of time (0; 4; 24 h) when culture supernatants were harvested.

Results: In both groups, basal Hsp72 increased over time (P < 0.02); Hsp90-α levels declined in controls (P < 0.02) but remained increased in septic patients (P < 0.02), not exhibiting any significant time-response trend. Both Glns suppressed Hsp72 in septic and controls at 10 mM by 4 h (P < 0.045) and Hsp90-α in the control group by 24 h (P < 0.045). LPS did not induce Hsps in either group. L-Ala-Gln did not induce any of the Th1, Th2, and Th17 cytokines in either group.

Conclusion: High doses of L-Gln or L-Ala-Gln do not induce any of the Th1, Th2, and Th17 cytokines in either healthy or septic human PBMCs. High Gln doses suppress Hsp72 in septic and control PBMCs. Hsp90-α time-series expression declines, contrasting the increasing trend of Hsp72 in healthy controls. Hsp90-α sustains increased levels in septic supernatants, showing a characteristic longitudinal behavior needed further elucidation.

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http://dx.doi.org/10.1016/j.nut.2014.01.018DOI Listing

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