4.3 Article

Omentin-1 Stimulates Human Osteoblast Proliferation through PI3K/Akt Signal Pathway

Journal

INTERNATIONAL JOURNAL OF ENDOCRINOLOGY
Volume 2013, Issue -, Pages -

Publisher

HINDAWI LTD
DOI: 10.1155/2013/368970

Keywords

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Funding

  1. National Natural Science Foundation of China [81270962, 81070246, 30801174]
  2. National Science Foundation for Postdoctoral Scientists of China [2012M521568]

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It has been presumed that adipokines deriving from adipose tissue may play important roles in bone metabolism. Omentin-1, a novel adipokine, which is selectively expressed in visceral adipose tissue, has been reported to stimulate proliferation and inhibit differentiation of mouse osteoblast. However, little information refers to the effect of omentin-1 on human osteoblast (hOB) proliferation. The current study examined the potential effects of omentin-1 on proliferation in hOB and the signal pathway involved. Omentin-1 promoted hOB proliferation in a dose-dependent manner as determined by [H-3] thymidine incorporation. Western blot analysis revealed that omentin-1 induced activation of Akt (phosphatidylinositol-3 kinase downstream effector) and such effect was impeded by transfection of hOB with Akt-siRNA. Furthermore, LY294002 (a selective PI3K inhibitor) and HIMO (a selective Akt inhibitor) abolished the omentin-1-induced hOB proliferation. These findings indicate that omentin-1 induces hOB proliferation via the PI3K/Akt signaling pathway and suggest that osteoblast is a direct target of omentin-1.

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