Analysis of p57KIP2's physiological role dependent on fat vitamines

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A CDK inhibitor, p57Kip2, might be one of the molecules for osteogenesis, because p57-ablated mice displayed delay of bone formation. So, we assumed that p57 could regulate the bioactivities of the certain vitamins or hormones for bone formation. Here we have found out that p57 bound VDR, vitamine D3 receptor, and was necessary for VDR's activity, which is the transcription factor. And p57 KO mice also displayed placentamegaly with trophoblastic displasia.p57 affected on the expression levels and cellular localization of ASCT2, which acts for the cell fusion in trophoblast-differentiation. Now we are examining the mechanism of the p57's activity on ASCT2 on placentamegaly.