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J. Cell Biol.,
Volume 143, Number 7, December 28, 1998 2067-2079

* Institut National de la Santé et de la Recherche Médicale (INSERM) Unité 489, Hôpital Tenon, 75020 Paris, France; and We immunopurified a surface antigen specific for the collecting duct (CD) epithelium. Microsequencing of three polypeptides identified the antigen as
the neuronal cell adhesion molecule L1, a member of
the immunoglobulin superfamily. The kidney isoform showed a deletion of exon 3. L1 was expressed in the
mesonephric duct and the metanephros throughout CD
development. In the adult CD examined by electron
microscopy, L1 was not expressed on intercalated cells
but was restricted to CD principal cells and to the papilla tall cells. By contrast, L1 appeared late in the distal portion of the elongating nephron in the mesenchymally derived epithelium and decreased during
postnatal development. Immunoblot analysis showed
that expression, proteolytic cleavage, and the glycosylation pattern of L1 protein were regulated during renal
development. L1 was not detected in epithelia of other
organs developing by branching morphogenesis. Addition of anti-L1 antibody to kidney or lung organotypic
cultures induced dysmorphogenesis of the ureteric bud
epithelium but not of the lung. These results suggest a
functional role for L1 in CD development in vitro. We
further postulate that L1 may be involved in the guidance of developing distal tubule and in generation and
maintenance of specialized cell phenotypes in CD.
Department of Cell Biology, Institute of Anatomy, University of Aarhus, DK-800 Aarhus C, Denmark
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