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B-box and SPRY domain containing protein (BSPRY) is associated with the maintenance of mouse embryonic stem cell pluripotency and early embryonic development.

J. Reprod. Dev.2012;58(6):691-9. Epub 2012 Aug 24
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摘要


Mouse embryonic stem (ES) cells consist of heterogeneous populations with differing abilities to proliferate and differentiate. We previously demonstrated that the expression level of platelet endothelial cell adhesion molecule 1 (PECAM1)/CD31 was positively correlated with the undifferentiated state of mouse ES cells. In order to screen for a novel gene(s) involved in ES cell pluripotency, we performed an oligo microarray analysis and identified that B-box and SPRY domain containing protein (BSPRY) was expressed at high levels in PECAM1-positive cells. Two splice isoforms of BSPRY, BSPRY-1 and BSPRY-2, were expressed in undifferentiated ES cells and in blastocysts. Knockdown of BSPRY-1/2 in ES cells significantly reduced the number of undifferentiated colonies and caused increased expression of primitive ectoderm marker gene Fgf5. The overexpression of BSPRY-2 reciprocally increased the number of undifferentiated ES cells in the presence of LIF. Similarly, injection of BSPRY-1/2 siRNAs into 2-cell embryos caused developmental retardation and degeneration of embryos, and a significant decrease in the number of cells, especially in the inner cell mass (ICM), was observed at the blastocyst stage. Furthermore, microinjection of a BSPRY-1 expression vector into pronuclear stage embryos resulted in an increase in the hatching blastocysts rate after 120 h of culture. These results suggest that BSPRY-1 and BSPRY-2 are associated with both ES cell pluripotency and early embryonic development.

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