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Journals The FASEB Journal September 2009

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Erythropoietin signaling promotes transplanted progenitor cell survival

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We examine the potential for erythropoietin signaling to promote donor cell survival in a model of myoblast transplantation. Expression of a truncated erythropoietin receptor in hematopoietic stem cells has been shown to promote selective engraftment in mice. We previously demonstrated expression of endogenous erythropoietin receptor on murine myoblasts, and erythropoietin treatment can stimulate myoblast proliferation and delay differentiation. Here, we report that enhanced erythropoietin receptor expression, as well as exogenous erythropoietin treatment in myoblasts, provided a survival advantage and protection against apoptosis under serum-starvation conditions. When cultured in differentiation medium, expression of the myogenic regulatory proteins shifted toward early differentiation with increased erythropoietin receptor. Expression of early myogenic differentiation proteins Myf-5 and MyoD increased, while later stage protein myogenin decreased. Transplantation of C2C12 myoblasts overexpressing truncated erythropoietin receptor showed more transplanted cell incorporation into muscle fibers in muscular dystrophy mdx mice. These cells also restored dystrophin protein expression in mdx mice at 6 wk after cell treatment that was further increased with exogenous erythropoietin administration. In summary, enhanced erythropoietin receptor expression promotes transplanted cell survival in a mouse model for myoblast transplantation and provides dystrophin expression in mice with muscular dystrophy.—Jia, Y., Warin, R., Yu, X., Epstein, R., Noguchi, C. T. Erythropoietin signaling promotes transplanted progenitor cell survival.

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Article Details
Jia, Yi; Warin, Renaud; Yu, Xiaobing; Epstein, Reed; Noguchi, Constance Tom
The FASEB Journal , Volume 23 (9): 3089
Fed of American Socs for Experimental Biology – Sep 1, 2009
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