Reduced insulin-stimulated GLUT4 bioavailability in stroke-prone spontaneously hypertensive rats

M Collison, D J James, D Graham, G D Holman, J M C Connell, A F Dominiczak, G W Gould, I P Salt

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Aims/hypothesis: Insulin-stimulated glucose transport is impaired in a genetic model of hypertension, the stroke-prone spontaneously hypertensive rat (SHRSP), yet the molecular mechanisms that underlie this defect in the animals remain unclear. Methods: We examined the effects of insulin on the trafficking of the insulin-responsive glucose transporter GLUT4 to the plasma membrane in isolated adipocytes from SHRSP and normotensive control Wistar-Kyoto (WKY) rats. Results: Treatment of isolated adipocytes with insulin resulted in trafficking of GLUT4 to the plasma membrane. There was no significant difference in the magnitude of insulin-stimulated GLUT4 trafficking from intracellular membranes to the plasma membrane between strains. In contrast, we demonstrated that there is a significant reduction in GLUT4 accessible to the glucose photolabel Bio-LC-ATB-BGPA at the plasma membrane of SHRSP adipocytes compared with control rats. Conclusions/interpretation: We propose that a large proportion of GLUT4 translocated to the plasma membrane in response to insulin is not able to bind substrate and catalyse transport in the SHRSP. Therefore, there is a reduction in bioavailable GLUT4 in SHRSP animals that is likely to account, at least in part, for the reduced insulin-stimulated glucose uptake.
Original languageEnglish
Pages (from-to)539-546
Number of pages8
JournalDiabetologia
Volume48
Issue number3
DOIs
Publication statusPublished - 2005

Fingerprint Dive into the research topics of 'Reduced insulin-stimulated GLUT4 bioavailability in stroke-prone spontaneously hypertensive rats'. Together they form a unique fingerprint.

Cite this