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- W2425355647 abstract "Several recent studies have provided clear evidence that angiotensin-converting enzyme (ACE)-inhibitors slow the progression of renal disease. These effects are mainly independent from a comitant reduction in systemic blood pressure. Thus, angiotensin II (Ang II) exerts other effects on the kidney which are involved in the loss of renal function. Ang II induces proliferation of cultured mesangial and glomerular endothelial cells. Our group was the first to demonstrate that Ang II stimulates hypertrophy of cultured proximal tubular cells. Ang II stimulates bioactivation and expression of transforming growth factor-beta (TGF-beta) in tubular MCT cells. This Ang II-mediated expression of TGF-beta is due to an increase in transcriptional activity. A neutralizing anti-TGF-beta antibody attenuates the Ang II-induced increase in protein synthesis in MCT cells suggesting that the hypertrophy is mediated by synthesis and activation of endogenous TGF-beta. Proximal tubular cells undergoing Ang II-mediated hypertrophy are arrested in the G1-phase of the cell cycle and express typical G1-phase-associated genes. Induction of such G1-phase-associated early growth response genes have been also described in vivo after infusion of Ang II into the renal artery. This G1-phase arrest depends on the induction of the cyclin-dependent kinase (CdK) inhibitor p27Kip1. p27Kip1 expression is stimulated after incubation of LLC-PK1 cells with Ang II or TGF-beta and binds to cyclin D1-CdK4 complexes, inhibits their kinase activity, and hampers G1-phase exit. Ang II stimulates transcription of collagen type IV in MCT cells. In addition to the classical a1 (IV) chain, a3 (IV) collagen, which has normally a restricted localization in the kidney, is also induced. This stimulation is mediated by endogenous synthesis and autocrine action of TGF-beta because a neutralizing anti-TGF-beta antibody as well as TGF-beta antisense oligonucleotides attenuate Ang II-induced collagen type IV transcription and synthesis. In addition, Ang II exerts immunomodulatory effects on the kidney through the induction of chemokines such as MCP-1 and RANTES. In conclusion, Ang II has emerged as a multifunctional acting as a growth factor and a profibrogenic cytokine, and even having inflammatory properties." @default.
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- W2425355647 date "1998-01-01" @default.
- W2425355647 modified "2023-09-23" @default.
- W2425355647 title "Angiotensin II is involved in the progression of renal disease: importance of non-hemodynamic mechanisms." @default.
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