Potential Antiinflammatory Role of Insulin via the Preferential Polarization of Effector T Cells toward a T Helper 2 Phenotype (original) (raw)

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1Diabetes and Obesity Research Program (A.V., D.C.), Garvan Institute of Medical Research, Sydney-Darlinghurst, New South Wales 2010, Australia

*Address all correspondence and requests for reprints to: Alexander Viardot, M.D., Diabetes and Obesity Research Program, Garvan Institute of Medical Research, 384 Victoria Street, Sydney-Darlinghurst, New South Wales 2010, Australia.

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2Arthritis and Inflammation Research Program (S.T.G., F.M.), Garvan Institute of Medical Research, Sydney-Darlinghurst, New South Wales 2010, Australia

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2Arthritis and Inflammation Research Program (S.T.G., F.M.), Garvan Institute of Medical Research, Sydney-Darlinghurst, New South Wales 2010, Australia

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1Diabetes and Obesity Research Program (A.V., D.C.), Garvan Institute of Medical Research, Sydney-Darlinghurst, New South Wales 2010, Australia

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Accepted:

15 September 2006

Published:

01 January 2007

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Alexander Viardot, Shane T. Grey, Fabienne Mackay, Donald Chisholm, Potential Antiinflammatory Role of Insulin via the Preferential Polarization of Effector T Cells toward a T Helper 2 Phenotype, Endocrinology, Volume 148, Issue 1, 1 January 2007, Pages 346–353, https://doi.org/10.1210/en.2006-0686
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Hyperglycemia in critical illness is a common complication and a strong independent risk factor for morbidity and death. Intensive insulin therapy decreases this risk by up to 50%. It is unclear to what extent this benefit is due to reversal of glucotoxicity or to a direct effect of insulin, because antiinflammatory effects of insulin have already been described, but the underlying mechanisms are still poorly understood. The insulin receptor is expressed on resting neutrophils, monocytes, and B cells, but is not detectable on T cells. However, significant up-regulation of insulin receptor expression is observed on activated T cells, which suggests an important role during T cell activation. Exogenous insulin in vitro induced a shift in T cell differentiation toward a T helper type 2 (Th2)-type response, decreasing the T helper type 1 to Th2 ratio by 36%. This result correlated with a corresponding change in cytokine secretion, with the interferon-γ to IL-4 ratio being decreased by 33%. These changes were associated with increased Th2-promoting ERK phosphorylation in the presence of insulin. Thus, we demonstrate for the first time that insulin treatment influences T cell differentiation promoting a shift toward a Th2-type response. This effect of insulin in changing T cell polarization may contribute to its antiinflammatory role not only in sepsis, but also in chronic inflammation associated with obesity and type 2 diabetes.

Copyright © 2007 by the Endocrine Society

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