PMID: 8971487Jan 1, 1995Paper

Transitional differentiation patterns of principal and intercalated cells during renal collecting duct development

Epithelial Cell Biology
J AignerWill W Minuth

Abstract

The developing renal collecting duct epithelium of neonatal rabbits exhibits 3 different zones. The ampullary tip epithelium acts as an embryonic inducer and is responsible for the generation of all of the nephron anlagen. It pilots the whole microarchitecture of the kidney. In the ampullary neck epithelium multiple cell divisions cause the elongation of the embryonic collecting duct so that the organ can grow. Finally, the cells in the ampullar shaft transdifferentiate into the functional collecting duct epithelium (CD) consisting of Principal (P) and various kinds of Intercalated (IC) cells. It is unknown by which morphogenic mechanisms the ampullar cells develop into the heterogeneously composed collecting duct epithelium. Using both morphological and immunohistochemical methods, we investigated the transdifferentiation patterns leading from the ampullar epithelium to the P and IC cells in the neonatal kidney. An electron microscope analysis of the cortico-medullary course of the developing collecting duct revealed that conspicuous morphological alterations start in the neck of the ampulla. The lumen of the neck region is narrowed to a slit. While most of the cells in the ampullar tip exhibit few, short microvilli, the neck ...Continue Reading

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