The sympathetic tone mediates leptin's inhibition of insulin secretion by modulating osteocalcin bioactivity.

The sympathetic tone mediates leptin's inhibition of insulin secretion by modulating osteocalcin bioactivity.
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DOI:
10.1083/jcb.200809113
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发表时间:
2008-12-29
影响因子:
7.8
通讯作者:
Karsenty, Gerard
Karsenty, Gerard
中科院分区:
生物学1区
文献类型:
--
作者:
Hinoi, Eiichi;Gao, Nan;Jung, Dae Young;Yadav, Vijay;Yoshizawa, Tatsuya;Myers, Martin G., Jr.;Chua, Streamson C., Jr.;Kim, Jason K.;Kaestner, Klaus H.;Karsenty, Gerard

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The osteoblast-secreted molecule osteocalcin favors insulin secretion, but how this function is regulated in vivo by extracellular signals is for now unknown. In this study, we show that leptin, which instead inhibits insulin secretion, partly uses the sympathetic nervous system to fulfill this function. Remarkably, for our purpose, an osteoblast-specific ablation of sympathetic signaling results in a leptin-dependent hyperinsulinemia. In osteoblasts, sympathetic tone stimulates expression of Esp, a gene inhibiting the activity of osteocalcin, which is an insulin secretagogue. Accordingly, Esp inactivation doubles hyperinsulinemia and delays glucose intolerance in ob/ob mice, whereas Osteocalcin inactivation halves their hyperinsulinemia. By showing that leptin inhibits insulin secretion by decreasing osteocalcin bioactivity, this study illustrates the importance of the relationship existing between fat and skeleton for the regulation of glucose homeostasis.
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