Oxytocin stimulates glucose uptake in skeletal muscle cells through the calcium-CaMKK-AMPK pathway.
Oxytocin is a mammalian hormone that is released mainly after distension of the uterine cervix. In this study, we report that oxytocin stimulates intracellular release of calcium, and also activates AMPK (AMP-activated protein kinase) in C2C12 myoblast cells in a time/dose-dependent manner. Oxytocin receptor mRNA was detected in C2C12 cells. In addition, oxytocin stimulated glucose uptake and, moreover, inhibition of either CaMKK (Ca(2+)/calmodulin-dependent protein kinase kinase) or AMPK blocked oxytocin-mediated AMPK activation and glucose uptake. Taken together, our findings suggest that oxytocin may serve a peripheral metabolic function in skeletal muscle cells through the calcium-CaMKK-AMPK pathway.
Department of Anatomy, Korea University College of Medicine, 126-1,5 ga, Anam-dong, Seongbuk-gu, Seoul, 136-701, Republic of Korea.
Eun Soo
ES
Lee
Kyung-Ok
KO
Uhm
Yun Mi
YM
Lee
Joseph
J
Kwon
Sun-Hwa
SH
Park
Kim Hyeon
KH
Soo
D055372:AMP-Activated Protein Kinases / Q000378:metabolism*; D000818:Animals; D001483:Base Sequence; D001693:Biological Transport, Active / Q000187:drug effects; D002118:Calcium / Q000378:metabolism*; D054737:Calcium-Calmodulin-Dependent Protein Kinase Kinase / Q000378:metabolism*; D002460:Cell Line; D017931:DNA Primers / Q000235:genetics; D004789:Enzyme Activation / Q000187:drug effects; D005260:Female; D005947:Glucose / Q000378:metabolism*; D051379:Mice; D018485:Muscle Fibers, Skeletal / Q000187:drug effects* / Q000378:metabolism*; D010121:Oxytocin / Q000494:pharmacology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018045:Receptors, Oxytocin / Q000235:genetics
D017931:DNA Primers; D012333:RNA, Messenger; D018045:Receptors, Oxytocin; D010121:Oxytocin; D054737:Calcium-Calmodulin-Dependent Protein Kinase Kinase; D055372:AMP-Activated Protein Kinases; D005947:Glucose; D002118:Calcium