Abstract
Caveolin-1, a principal component of caveolae, modulates growth signaling, endocytosis, and intracellular transport. We examined the expression of caveolin-1α and its relation to cell cycle and caveolin-interacting growth factor receptors in regenerating proximal tubules (PTs) after gentamicin-induced acute renal failure in rats. Caveolin-1α appeared in regenerating PTs as early as day 4 after last gentamicin, peaked at days 6 to 8, and showed cytoplasmic pattern after day 8. Immunoelectron microscopy revealed caveolin-1α-positive caveolae on the cell membrane and in cytoplasms in regenerating PTs at days 4 to 8 and caveolin-positivity confined to cytoplasms after day 10. The number of PT cells with proliferation markers peaked at day 6 and decreased afterwards as expression of cyclin-dependent kinase inhibitors increased. Platelet-derived growth factor receptor-β (PDGFR-β) and epidermal growth factor receptor (EGFR) were colocalized with caveolin-1α in proliferating PTs as early as day 4. Phosphorylated EGFR increased at day 8 and afterwards when caveolins dissociated from EGFR or decreased. In case of PDGFR-β, phosphorylation seemed to be associated with the increase and association of caveolins to the receptors. Our results suggest that transient expression of caveolin-1α in early regenerating PTs might contribute to the regenerating process of PTs through modulating growth factor receptors.
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We thank Ms. Etsuko Hakamata for the excellent technical assistance. This work was presented in part at the XLIIth Congress of the ERA-EDTA in Istanbul, Turkey, 2005.
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Fujigaki, Y., Sakakima, M., Sun, Y. et al. Immunohistochemical study on caveolin-1α in regenerating process of tubular cells in gentamicin-induced acute tubular injury in rats. Virchows Arch 450, 671–681 (2007). https://doi.org/10.1007/s00428-007-0417-4
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DOI: https://doi.org/10.1007/s00428-007-0417-4