IGF-I increases the recruitment of GLUT4 and GLUT3 glucose transporters on cell surface in hyperthyroidism.

Abstract:

OBJECTIVE:In hyperthyroidism, tissue glucose disposal is increased to adapt to high energy demand. Our aim was to examine the regulation of glucose transporter (GLUT) isoforms by IGF-I in monocytes from patients with hyperthyroidism. DESIGN AND METHODS:Blood (20 ml) was drawn from 21 healthy and 10 hyperthyroid subjects. The abundance of GLUT isoforms on the monocyte plasma membrane was determined in the absence and presence of IGF-I (0.07, 0.14, and 0.7 nM) using flow cytometry. Anti-CD14-phycoerythrin monocional antibody was used for monocyte gating. GLUT isoforms were determined after staining the cells with specific antisera to GLUT3 and GLUT4. RESULTS:In monocytes from the euthyroid subjects, IGF-I increased the abundance of GLUT3 and GLUT4 on the monocyte surface by 25 and 21% respectively (P<0.0005 with repeated measures ANOVA). Hyperthyroidism increased the basal monocyte surface GLUT3 and GLUT4; in these cells, IGF-I had a marginal but highly significant effect (P=0.003, with repeated measures ANOVA) on GLUT3 (11%) and GLUT4 (10%) translocation on the plasma membrane. CONCLUSIONS:In hyperthyroidism: 1) basal abundance of GLUT3 and GLUT4 on the plasma membrane is increased and 2) the sensitivity of the recruitment of GLUT3 and GLUT4 transporters on the plasma membrane in response to IGF-I is increased. These findings may contribute to the understanding of the mechanism by which hyperthyroidism increases glucose disposal in peripheral tissues.

journal_name

Eur J Endocrinol

authors

Dimitriadis G,Maratou E,Boutati E,Kollias A,Tsegka K,Alevizaki M,Peppa M,Raptis SA,Hadjidakis DJ

doi

10.1530/EJE-07-0532

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

361-6

issue

3

eissn

0804-4643

issn

1479-683X

pii

158/3/361

journal_volume

158

pub_type

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