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- W2125280399 abstract "Podocyte apoptosis initiates progressive glomerulosclerosis in TGF-β1 transgenic and CD2AP-knockout (CD2AP−/−) mice. It was previously shown that in both mouse models, activation of the TGF-β pathway is the key event during development of podocyte apoptosis. Furthermore, CD2AP is an important modifier of TGF-β–induced survival signaling <i>via</i> activation of the phosphoinositol 3-kinase/AKT signaling pathway. This article presents IGF-binding protein-3 (IGFBP-3) as a new modulator of apoptosis and survival signaling in glomerular podocytes. High expression of IGFBP-3 protein in the urine of diseased CD2AP−/− mice was discovered, and IGFBP-3 expression in glomerular podocytes and parietal cells was detected. IGFBP-3 can induce changes in podocyte actin cytoskeleton, leads to apoptosis in cultured murine podocytes, and can enhance TGF-β1–induced apoptosis <i>in vitro</i>. For studying this process on a molecular level, proapoptotic p38 mitogen-activated protein kinase pathways and antiapoptotic phosphoinositol 3-kinase/AKT pathways were examined in cultured murine podocytes. It was found that IGFBP-3 increments the level of TGF-β1–induced phosphorylated p38 mitogen-activated protein kinase and decreases the phosphorylation of antiapoptotic AKT. This effect is specific for the co-stimulation of IGFBP-3 with TGF-β1 because a combination of IGFBP-3 with bone morphogenic protein-7 (BMP-7), another member of the TGF-β superfamily, results in apoptosis opposing signaling effects with a strong increase of phosphorylated AKT and subsequent functional effects. These results demonstrate that the IGF/IGFBP axis plays an important role in the development of podocyte apoptosis by modulation of TGF-β and BMP-7–induced pro- and antiapoptotic signals." @default.
- W2125280399 created "2016-06-24" @default.
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- W2125280399 date "2006-06-01" @default.
- W2125280399 modified "2023-09-26" @default.
- W2125280399 title "IGF-Binding Protein-3 Modulates TGF-β/BMP-Signaling in Glomerular Podocytes" @default.
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- W2125280399 doi "https://doi.org/10.1681/asn.2005111209" @default.
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