Involvement of ATP-sensitive potassium channels in proliferation and differentiation of rat preadipocytes / 生理学报
Acta Physiologica Sinica
; (6): 8-12, 2007.
Article
in En
| WPRIM
| ID: wpr-258695
Responsible library:
WPRO
ABSTRACT
This paper was aimed to investigate the effects of ATP-sensitive potassium channels on the proliferation and differentiation of rat preadipocytes. We examined the expression of sulphonylurea receptor 2 (SUR2) mRNA in preadipocytes and adipocytes obtained by inducing for 5 d and the effects of the inhibitor (glibenclamide) and opener (diazoxide) of ATP-sensitive potassium channels on the expression of SUR2 mRNA in preadipocytes by real-time PCR. Preadipocyte proliferation and cell cycle were measured by MTT spectrophotometry and flow cytometer. The content of intracellular lipid was measured by oil red O staining, cell diameter was determined by Image-Pro Plus 5.0 software and the expression of peroxisome proliferator-activated receptor-gamma (PPAR-gamma) mRNA was estimated by RT-PCR. SUR2 mRNA was expressed in both preadipocytes and adipocytes obtained by inducing for 5 d, and the expression in adipocytes was obviously higher than that in preadipocytes. Glibenclamide inhibited the expression of SUR2 mRNA in preadipocyte, promoted preadipocyte proliferation in a dose-dependent manner, increased the cell percentages in G(2)/M + S phase, increased lipid content, augmented adipocyte diameter, and promoted the expression of PPAR-gamma mRNA. But the actions of diazoxide were contrary to those of glibenclamide. These results suggest that ATP-sensitive potassium channels regulate the proliferation and differentiation of preadipocytes, and PPAR-gamma is probably involved in the effect of ATP-sensitive potassium channels.
Full text:
1
Database:
WPRIM
Main subject:
Pathology
/
Physiology
/
Receptors, Drug
/
RNA, Messenger
/
Cell Differentiation
/
Cells, Cultured
/
Rats, Sprague-Dawley
/
Adipocytes
/
ATP-Binding Cassette Transporters
/
Cell Biology
Type of study:
Diagnostic_studies
Limits:
Animals
Language:
En
Journal:
Acta Physiologica Sinica
Year:
2007
Document type:
Article