MicroRNA-29a is up-regulated in beta-cells by glucose and decreases glucose-stimulated insulin secretion

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Annika Bagge, Trine R Clausen, Sylvester Larsen, Mette Ladefoged, Maiken W Rosenstierne, Louise Larsen, Ole Vang, Jens Høiriis Nielsen, Louise T Dalgaard

Chronically elevated levels of glucose impair pancreatic beta-cell function while inducing beta-cell proliferation. MicroRNA-29a (miR-29a) levels are increased in several tissues in diabetic animals and mediate decreased insulin-stimulated glucose-transport of adipocytes. The aim was to investigate the impact of glucose on miR-29a levels in INS-1E beta-cells and in human islets of Langerhans and furthermore to evaluate the impact of miR-29a on beta-cell function and proliferation. Increased glucose levels up-regulated miR-29a in beta-cells and human and rat islets of Langerhans. Glucose-stimulated insulin-secretion (GSIS) of INS-1E beta-cells was decreased by forced expression of miR-29a, while depletion of endogenous miR-29a improved GSIS. Over-expression of miR-29a increased INS-1E proliferation. Thus, miR-29a up-regulation is involved in glucose-induced proliferation of beta-cells. Furthermore, as depletion of miR-29a improves beta-cell function, miR-29a is a mediator of glucose-induced beta-cell dysfunction. Glucose-induced up-regulation of miR-29a in beta-cells could be implicated in progression from impaired glucose tolerance to type 2 diabetes.
OriginalsprogEngelsk
TidsskriftBiochemical and Biophysical Research Communications
Vol/bind426
Udgave nummer2
Sider (fra-til)266-72
Antal sider7
ISSN0006-291X
DOI
StatusUdgivet - 21 sep. 2012

ID: 47972027