Published online before print November 13, 2003, doi: 10.1161/01.ATV.0000107028.20478.8e
© 2003 American Heart Association, Inc.
Vascular Biology |
Insulin Stimulates Glucose Transport Via Nitric Oxide/Cyclic GMP Pathway in Human Vascular Smooth Muscle Cells
From the Department of Genetics, Biology and Biochemistry, University of Turin (L.B., F.S., C.R., E.A., D.G., A.B.), Turin, Italy; and Metabolic Disease and Diabetes Unit, Department of Clinical and Biological Sciences, University of Turin, San Luigi Gonzaga Hospital (I.R., G.A., M.T.), Orbassano-Torino, Italy.
Correspondence to Amalia Bosia, Dipartimento di Genetica, Biologia e Biochimica - Sezione di Biochimica, Via Santena, 5/bis - 10126 Torino - Italy. E-mail amalia.bosia{at}unito.it
Objective— In cultured human vascular smooth muscle cells, insulin increases cyclic GMP production by inducing nitric oxide (NO) synthesis. The aim of the present study was to determine whether in these cells the insulin-stimulated NO/cyclic GMP pathway plays a role in the regulation of glucose uptake.
Methods and Results— Glucose transport in human vascular smooth muscle cells was measured as uptake of 2-deoxy-d-[3H]glucose, cyclic GMP synthesis was checked by radioimmunoassay, and GLUT4 recruitment into the plasma membrane was determined by immunofluorescence. Insulin-stimulated glucose transport and GLUT4 recruitment were blocked by an inhibitor of NO synthesis and mimicked by NO-releasing drugs. Insulin- and NO-elicited glucose uptake were blocked by inhibitors of soluble guanylate cyclase and cyclic GMP–dependent protein kinase; furthermore, glucose transport was stimulated by an analog of cyclic GMP.
Conclusions— Our results suggest that insulin-elicited glucose transport (and the corresponding GLUT4 recruitment into the plasma membrane) in human vascular smooth muscle cells is mediated by an increased synthesis of NO, which stimulates the production of cyclic GMP and the subsequent activation of a cyclic GMP–dependent protein kinase.
Key Words: insulin signaling • muscle, smooth, vascular • glucose transport • nitric oxide • cyclic GMP
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