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PMID |
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9811343
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To determine the relationship between cell cycle regulation and differentiation, the spatiotemporal expression of cyclin A, cyclin B1, cyclin D1, the cyclin-dependent kinase inhibitors (CKIs) p27 and p57, and markers of differentiating podocytes in developing human kidneys was investigated by immunohistochemistry.
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9811343
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In S-shaped body stage, Ki-67, a cell proliferation marker that labels the G1/S/G2/M phase, was expressed in the majority (more than 80%) of presumptive podocytes, along with cyclin A (approximately 20% of the Ki-67-positive cells) and cyclin B1 (less than 5% of Ki-67-positive cells) expression.
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9811343
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Among these cells), cyclin D1 and CKIs were markedly down-regulated.
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9811343
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At the capillary-loop stage, by contrast, CKIs and cyclin D1 were intensely positive in podocytes, whereas no Ki-67, cyclin B1, or cyclin A expression was seen.
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9811343
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Moreover, double-immunolabeling and serial-section analysis provided evidence that CKIs and markers specific for differentiating podocytes, namely PHM-5 (podocalyxin-like protein in humans), synaptopodin (a foot process-related protein), and C3b receptor, were co-expressed at the capillary-loop stage.
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9811343
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Furthermore, bcl-2 (an apoptosis inhibitory protein) showed a reciprocal expression pattern to that of CKI.
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10526006
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Additionally, serial section analysis revealed that Ki-67-positive cells in the crescents were frequently cyclin-A positive and Bcl-2 positive, but seldom cyclin-B(1) positive.
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| 8 |
10526006
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Moreover, the expression of cyclin-dependent kinase inhibitor p27(Kip1) was low in the cellular crescents, despite being exclusively positive in podocytes within the same section.
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| 9 |
10526006
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We concluded that the major component of the cellular crescents is made up of PECs and that apparent expression of cyclins and Bcl-2 and restrained expression of p27(Kip1) may be synergistically associated with the development of cellular crescents in human CRGN.
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| 10 |
10526006
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Additionally, serial section analysis revealed that Ki-67-positive cells in the crescents were frequently cyclin-A positive and Bcl-2 positive, but seldom cyclin-B(1) positive.
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| 11 |
10526006
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Moreover, the expression of cyclin-dependent kinase inhibitor p27(Kip1) was low in the cellular crescents, despite being exclusively positive in podocytes within the same section.
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| 12 |
10526006
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We concluded that the major component of the cellular crescents is made up of PECs and that apparent expression of cyclins and Bcl-2 and restrained expression of p27(Kip1) may be synergistically associated with the development of cellular crescents in human CRGN.
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11141501
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Hepatocyte growth factor, but not insulin-like growth factor I, protects podocytes against cyclosporin A-induced apoptosis.
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11141501
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Cyclosporin A (CsA) nephropathy is associated with altered expression of apoptosis regulatory genes such as Fas-ligand and Bcl-2 family members in the glomerular, tubulointerstitial, and vascular compartments.
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11141501
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Both hepatocyte growth factor (HGF) and insulin-like growth factor (IGF-I) protect against apoptosis, and HGF specifically up-regulates Bcl-xL, a protein that regulates apoptosis.
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11141501
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We investigated whether Bcl-xL and Fas/Fas-ligand were regulated by CsA in cultured podocytes and whether CsA-induced apoptosis was prevented by HGF or IGF-I.
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11141501
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A murine podocyte cell line was treated with CsA in the presence or absence of HGF or IGF-I.
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11141501
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Apoptosis was quantitated by ELISA and by flow cytometry; Bcl-xL, Fas, and Fas-ligand were measured by Western blotting.
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11141501
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Inhibitors of MAP kinase/ERK kinase (MEK)-1 and of phosphatidylinositol 3'-kinase (PI3'-K) were used to determine the signaling pathways involved in Bcl-xL regulation.
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11141501
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HGF, but not IGF-I, prevented apoptosis and restored Bcl-xL levels.
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11141501
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The regulation of Bcl-xL by HGF was mediated by the PI3'-K but not by the MEK-1 pathway.
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11141501
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Apoptosis was prevented by pretreatment with HGF but not IGF-I.
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