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• W2372694920 abstract "Leukocyte signaling in patients with systemic insulin resistance is largely unexplored. We recently discovered the presence of multiple Toll-like receptor 4 (TLR4) signaling intermediates in leukocytes from patients with type 2 diabetes or acute insulin resistance associated with cardiopulmonary bypass surgery. We extend this work to show that in addition to matrix metalloproteinase 9, hypoxia-inducible factor 1α, and cleaved AMPKα, patient leukocytes also express IRS-1 phosphorylated on Ser312, Akt phosphorylated on Thr308, and elevated TLR4 expression. Similar signaling intermediates were detected in leukocytes and neutrophils treated with lipopolysaccharide (LPS), a ligand of TLR4, in vitro. In contrast, insulin, but not LPS, induced mammalian target of rapamycin complex 2 (mTORC2)–dependent phosphorylation of Akt on Ser473 and FoxO1/O3a on Thr24/32 in leukocytes and neutrophils. Insulin suppressed LPS-induced responses in a dose- and time-dependent manner. AS1842856, a FoxO1 inhibitor, also suppressed TLR4 signaling. We propose that insulin is a homeostatic regulator of leukocyte responses to LPS/TLR4 and that the signaling intermediates expressed in leukocytes of patients with type 2 diabetes indicate TLR4 signaling dominance and deficient insulin signaling. The data suggest that insulin suppresses LPS/TLR4 signals in leukocytes through the mTORC2-Akt-FoxO signaling axis. Better understanding of leukocyte signaling in patients with type 2 diabetes may shed new light on disease causation and progression." @default.
• W2372694920 created "2016-06-24" @default.
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• W2372694920 date "2016-05-10" @default.
• W2372694920 modified "2023-10-12" @default.
• W2372694920 title "Insulin-Dependent Regulation of mTORC2-Akt-FoxO Suppresses TLR4 Signaling in Human Leukocytes: Relevance to Type 2 Diabetes" @default.
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• W2372694920 doi "https://doi.org/10.2337/db16-0027" @default.
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