Hematopoietic Cell-Expressed Endothelial Nitric Oxide Protects the Liver From Insulin Resistance.

Autor:	Dick BP; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., McMahan R; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Knowles T; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Becker L; Ben May Department for Cancer Research, University of Chicago, IL (L.B.)., Gharib SA; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Vaisar T; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Wietecha T; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., O'Brien KD; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Bornfeldt KE; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Chait A; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.)., Kim F; From the Department of Medicine, University of Washington, Seattle (B.P.D., R.M., T.K., S.A.G., T.V., T.W., K.D.O., K.E.B., A.C., F.K.).
Jazyk:	angličtina
Zdroj:	Arteriosclerosis, thrombosis, and vascular biology [Arterioscler Thromb Vasc Biol] 2020 Mar; Vol. 40 (3), pp. 670-681. Date of Electronic Publication: 2020 Jan 30.
DOI:	10.1161/ATVBAHA.119.313648
Abstrakt:	Objective: Mice genetically deficient in endothelial nitric oxide synthase (Nos3 -/- ) have fasting hyperinsulinemia and hepatic insulin resistance, indicating the importance of Nos3 (nitric oxide synthase) in maintaining metabolic homeostasis. Although the current paradigm holds that these metabolic effects are derived specifically from the expression of Nos3 in the endothelium, it has been established that bone marrow-derived cells also express Nos3. The aim of this study was to investigate whether bone marrow-derived cell Nos3 is important in maintaining metabolic homeostasis. Approach and Results: To test the hypothesis that bone marrow-derived cell Nos3 contributes to metabolic homeostasis, we generated chimeric male mice deficient or competent for Nos3 expression in circulating blood cells. These mice were placed on a low-fat diet for 5 weeks, a time period which is known to induce hepatic insulin resistance in global Nos3-deficient mice but not in wild-type C57Bl/6 mice. Surprisingly, we found that the absence of Nos3 in the bone marrow-derived component is associated with hepatic insulin resistance and that restoration of Nos3 in the bone marrow-derived component in global Nos3-deficient mice is sufficient to restore hepatic insulin sensitivity. Furthermore, we found that overexpression of Nos3 in bone marrow-derived component in wild-type mice attenuates the development of hepatic insulin resistance during high-fat feeding. Finally, compared with wild-type macrophages, the loss of macrophage Nos3 is associated with increased inflammatory responses to lipopolysaccharides and reduced anti-inflammatory responses to IL-4, a macrophage phenotype associated with the development of hepatic and systemic insulin resistance. Conclusions: These results would suggest that the metabolic and hepatic consequences of high-fat feeding are mediated by loss of Nos3/nitric oxide actions in bone marrow-derived cells, not in endothelial cells.
Databáze:	MEDLINE
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