PKCε regulates contraction-stimulated GLUT4 traffic in skeletal muscle cells.

Abstract:

:The signaling pathways that stimulate glucose uptake in response to muscle contraction are not well defined. Recently, we showed that carbachol, an acetylcholine analog, stimulates contraction of C2C12 myotube cultures and the rapid arrival of myc-epitope tagged GLUT4 glucose transporters at the cell surface. Here, we explore a role for protein kinase C (PKC) in regulating GLUT4 traffic. Cell surface carbachol-induced GLUT4myc levels were partly inhibited by the conventional/novel PKC inhibitors GF-109203X, Gö6983, and Ro-31-8425 but not by the conventional PKC inhibitor Gö6976. C2C12 myotubes expressed several novel isoforms of PKC mRNA with PKCδ and PKCε in greater abundance. Carbachol stimulated phosphorylation of PKC isoforms and translocation of PKCδ and PKCε to membranes within 5 min. However, only a peptidic inhibitor of PKCε translocation (myristoylated-EAVSLKPT), but not one of PKCδ (myristoylated-SFNSYELGSL), prevented the GLUT4myc response to carbachol. Significant participation of PKCε in the carbachol-induced gain of GLUT4myc at the surface of C2C12 myotubes was further supported through siRNA-mediated PKCε protein knockdown. These findings support a role for novel PKC isoforms, especially PKCε, in contraction-stimulated GLUT4 traffic in muscle cells.

journal_name

J Cell Physiol

authors

Niu W,Bilan PJ,Yu J,Gao J,Boguslavsky S,Schertzer JD,Chu G,Yao Z,Klip A

doi

10.1002/jcp.22320

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

173-80

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

226

pub_type

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