Implication of phosphorylation of the myosin II regulatory light chain in insulin-stimulated GLUT4 translocation in 3T3-F442A adipocytes
Experimental & Molecular Medicine
;
: 180-189, 2006.
Artigo
em Inglês
| WPRIM
| ID: wpr-15693
ABSTRACT
In adipocytes, insulin stimulates glucose transport primarily by promoting the translocation of GLUT4 to the plasma membrane. Requirements for Ca2+/ calmodulin during insulin-stimulated GLUT4 translocation have been demonstrated; however, the mechanism of action of Ca2+ in this process is unknown. Recently, myosin II, whose function in non-muscle cells is primarily regulated by phosphorylation of its regulatory light chain by the Ca2+/calmodulin-dependent myosin light chain kinase (MLCK), was implicated in insulin-stimulated GLUT4 translocation. The present studies in 3T3- F442A adipocytes demonstrate the novel finding that insulin significantly increases phosphorylation of the myosin II RLC in a Ca2+-dependent manner. In addition, ML-7, a selective inhibitor of MLCK, as well as inhibitors of myosin II, such as blebbistatin and 2,3-butanedione monoxime, block insulin- stimulated GLUT4 translocation and subsequent glucose transport. Our studies suggest that MLCK may be a regulatory target of Ca2+/calmodulin and may play an important role in insulin-stimulated glucose transport in adipocytes.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Fosforilação
/
Azepinas
/
Quinase de Cadeia Leve de Miosina
/
Calmodulina
/
Células 3T3
/
Adipócitos
/
Transporte Proteico
/
Miosina Tipo II
/
Relação Dose-Resposta a Droga
/
Inibidores Enzimáticos
Limite:
Animais
Idioma:
Inglês
Revista:
Experimental & Molecular Medicine
Ano de publicação:
2006
Tipo de documento:
Artigo
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