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Protein localization and mRNA expression of epimorphin in mouse and human kidneys.

Epimorphin is a mesenchymal cell surface protein which induces epithelial branching morphogenesis. However, the role of epimorphin in the kidney has not been addressed. In the present study, the localization of epimorphin protein and the expression of its mRNA were investigated in the developing mouse and adult human kidneys using immunohistochemistry and semiquantitative RT-PCR. The in vitro expression of epimorphin protein and its mRNA was also explored in cultured mouse and human mesangial cells. Epimorphin protein was expressed in the renal interstitium and the circumference of the comma-shaped body at day 16 of gestation. The intensity and distribution of epimorphin were gradually increased during kidney differentiation and maturation. Epimorphin was first observed in glomeruli at 1 week of age. The localization of epimorphin in glomerular mesangial cells and interstitial fibroblasts was confirmed by immunoelectron microscopy of 2-week-old mouse kidneys. The highest mRNA expression of epimorphin was observed at day 16 of gestation, thereafter it diminished with the maturation of the kidney. A similar localization of epimorphin was observed in a normal adult human kidney. Cultured human mesangial cells expressed epimorphin mRNA 150-kD protein. These results suggest that epimorphin may play a role in the development of the kidney and in the differentiation of fibroblast and mesangial cells.[1]

References

  1. Protein localization and mRNA expression of epimorphin in mouse and human kidneys. Horikoshi, S., Yoshikawa, M., Shibata, T., Takahashi, K., Shirato, I., Tomino, Y. Exp. Nephrol. (2001) [Pubmed]
 
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