Induction of differentiation in cultured rat and human podocytes.

Journal of the American Society of Nephrology : JASN
P MundelWilhelm Kriz

Abstract

Mature podocytes are highly differentiated cells that are unable to divide in vivo. During glomerulogenesis, podocytes develop from simple cuboidal cells into their adult phenotype, which is characterized by a complex pattern of processes. Cultivation of podocytes under standard conditions leads to dedifferentiation, including the loss of processes and of pp44, a marker of differentiated podocytes. In this study, the cell culture conditions for rat and human podocytes were modified by avoiding repeated subcultivation. This led to profound phenotypic changes in podocytes in vitro. The conversion of cobblestones into arborized cells was directly observed, and a series of intermediate phenotypes was documented. The cells converted within 3 wk from typical cobblestone appearance into individual arborized cells more closely resembling in vivo podocytes. Arborized cells were frequently binucleated and reached a size of up to 500 microns. Both cobblestone and arborized cells originated from podocytes, as evidenced by the expression of a podocyte-specific O-acetylated ganglioside and of the WT-1 protein. In contrast to primary cultures and early passages of cobblestones, a cloned rat podocyte cell line did not express WT-1 and could no...Continue Reading

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