Expression of NCAM recapitulates tubulogenic development in kidneys recovering from acute ischemia.

Recovery of the kidney from acute renal failure relies on a sequence of events including epithelial cell dedifferentiation and proliferation followed by differentiation and restoration of the functional integrity of the nephron. The factors responsible for, and the significance of, reversion to a less differentiated cell phenotype and its relationship to the proliferative response after ischemia are poorly understood. In an attempt to identify adhesion molecules that may be influential in the recovery process, the expression of neural cell adhesion molecule (NCAM) and markers of epithelial differentiation and proliferation were analyzed at various times after an ischemic insult. In maturing nephrons, NCAM is detectable by immunohistochemistry in renal vesicles, S-shaped bodies, and early tubules. There is minimal cellular NCAM expression in normal tubules of the adult kidney. In contrast, in postischemic kidneys, NCAM expression is abundant in S3 proximal tubule cells 5 days after reperfusion. As in developing tubules, NCAM is concentrated in basal and lateral aspects of cells that have no apical gp330 or dipeptidyl peptidase IV detectable on their brush border. The expression of NCAM is preceded by disassembly of the brush border and proliferation of surviving S3 cells, which is most prominent at 2 days postischemia. NCAM expression persists in some flattened and dedifferentiated cells for up to 7 wk after ischemia. Thus proximal tubule epithelial cells of the postischemic kidney express NCAM in a pattern that recapitulates the expression of NCAM in the developing kidney. Such reversion of phenotype extends at least back to the early stages of renal vesicle formation, and this reversion may represent a critical step in the reestablishment of a normal tubule. NCAM-matrix interactions may mediate the motogenic and mitogenic responses of the dedifferentiated epithelium that are critical to reestablishment of a functional proximal tubule.

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