Acute exercise alters Galphai2 protein expressions through the ubiquitin-proteasome proteolysis pathway in rat adipocytes

Biochemical and Biophysical Research Communications
Junetsu OgasawaraTetsuya Izawa

Abstract

The effects of acute exercise on the protein expressions of heterotrimeric G protein alpha subunits were examined in rat adipocytes. Galphai2 protein expression was significantly reduced 0 and 3h after exercise but increased 24h after exercise, without alterations in Galphai2 mRNA expressions. The protein expressions of other alpha subunits, Galphas, Galphai1, and Galphai3, were not influenced. Both the 26S proteasome activity and polyubiquitination of Galphai2 protein were significantly increased 0 and 3h after exercise. Whereas, proteasome activity was decreased, and the polyubiquitination of Galphai2 protein was returned to the control level 24h after exercise. The reductions in Galphai2 protein expressions 0 and 3h after exercise were completely prevented by the injection either of a proteasome inhibitor or of a beta-adrenergic receptor blocker prior to exercise. Thus, acute exercise altered the expression of Galphai2 protein via mechanisms which involve the coupling of beta-adrenergic receptors to an agonist with subsequent ubiquitin-proteasome-dependent proteolysis.

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Citations

Oct 17, 2012·The Journal of Biological Chemistry·Prabha ChandrasekaranSundararajan Venkatesan
Aug 17, 2010·Biochemical and Biophysical Research Communications·Junetsu OgasawaraHideki Ohno
May 15, 2013·Biochemical and Biophysical Research Communications·Kanako ChishikiHideki Sumimoto
Dec 22, 2005·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Junetsu OgasawaraTetsuya Izawa

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