Insulin signaling in osteoblasts integrates bone remodeling and energy metabolism.

Insulin signaling in osteoblasts integrates bone remodeling and energy metabolism.
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DOI:
10.1016/j.cell.2010.06.003
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发表时间:
2010-07-23
期刊:
影响因子:
64.5
通讯作者:
Karsenty G
Karsenty G
中科院分区:
生物学1区
文献类型:
--
作者:
Ferron M;Wei J;Yoshizawa T;Del Fattore A;DePinho RA;Teti A;Ducy P;Karsenty G

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The broad expression of the insulin receptor suggests that the spectrum of insulin function has not been fully described. A cell type expressing this receptor is the osteoblast, a bone-specific cell favoring glucose metabolism through a hormone, osteocalcin, that becomes active once uncarboxylated. We show here that insulin signaling in osteoblasts is necessary for whole-body glucose homeostasis because it increases osteocalcin activity. To achieve this function insulin signaling in osteoblasts takes advantage of the regulation of osteoclastic bone resorption exerted by osteoblasts. Indeed, since bone resorption occurs at a pH acid enough to decarboxylate proteins, osteoclasts determine the carboxylation status and function of osteocalcin. Accordingly, increasing or decreasing insulin signaling in osteoblasts promotes or hampers glucose metabolism in a bone resorption-dependent manner in mice and humans. Hence, in a feed-forward loop, insulin signals in osteoblasts to activate a hormone, osteocalcin, that promotes glucose metabolism.
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