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Enhanced mitochondrial biogenesis contributes to Wnt induced osteoblastic differentiation of C3H10T1/2 cells.

Abstract：

:Mitochondria play a key role in cell physiology including cell differentiation and proliferation. We investigated the changes of mitochondrial biogenesis during Wnt-induced osteoblastic differentiation of murine mesenchymal C3H10T1/2 cells. Scanning electron microscopy demonstrated that activation of Wnt signaling by Wnt-3A conditioned medicum (CM) resulted in significant increase in the number of mitochondria in C3H10T1/2 cells. In addition, the induction of alkaline phosphatase (ALP) activities by Wnt-3A CM was accompanied by significant increase in mitochondrial mass (p<0.05), mitochondrial membrane potential (p<0.05), intracellular reactive oxygen species production (p<0.05), resting oxygen consumption rate (p<0.05), cellular ATP content (p< or =0.05) and mtDNA copy number (p<0.05) compared to the cells with control CM (L292-CM) treatment. Moreover, co-treatment with Dkk-1 or WIF-1, both of which are Wnt inhibitors, abrogated the Wnt-3A-induced ALP activities as well as mitochondrial biogenesis markers. Upregulation of mitochondrial biogenesis by overexpression of mitochondrial transcription factor A (Tfam) significantly enhanced Wnt-induced osteogenesis as measured by ALP activities. In contrast, inhibition of mitochondrial biogenesis by treatment with Zidovudine (AZT) resulted in significant inhibition of ALP activities. Finally, ALP activities in human osteosarcoma cell line devoid of mitochondrial DNA (rho(0) cells) was significantly suppressed both in basal and Wnt-3A stimulated state compared to those from mitochondria-intact cells (rho+ cells). As a mechanism for Wnt-mediated mitochondrial biogenesis, we found that Wnt increased the expression of PGC-1alpha, a critical molecules in mitochondrial biogenesis, through Erk and p38 MAPK pathway independent of beta-catenin signaling. We also found that increased mitochondrial biogenesis is in turn positively regulating TOPflash reporter activity as well as beta-catenin levels. To summarize, mitochodrial biogenesis is upregulated by Wnt signaling and this upregulation contributes to the osteoblastic differentiation of mouse mesenchymal C3H10T1/2 cells.

journal_name

Bone

journal_title

Bone

authors

An JH,Yang JY,Ahn BY,Cho SW,Jung JY,Cho HY,Cho YM,Kim SW,Park KS,Kim SY,Lee HK,Shin CS

doi

10.1016/j.bone.2010.04.593

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

140-50

issue

1

eissn

8756-3282

issn

1873-2763

pii

S8756-3282(10)01137-3

journal_volume

47

pub_type

杂志文章

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