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• W2012189743 abstract "Activation of the renin–angiotensin system (RAS) is thought to promote myocardial fibrosis. However, it is unclear whether this physiological fibrotic response results from chronic hemodynamic stress or from direct cellular signaling. Male C57B/6 mice were randomly assigned to receive angiotensin II (AngII) (2.0 μg kg−1 min−1), AngII+hydralazine (6.9 μg kg−1 min−1) or saline (control) via osmotic pumps for 7 days. Blood pressure was measured via noninvasive plethysmography. Hearts were harvested and processed for analysis. Cellular infiltration and collagen deposition were analyzed using histological staining. Molecular mediators were assessed using quantitative RT-PCR. As previously described, animals that received AngII developed hypertension and multifocal cellular infiltration by SMA+/CD133+ fibroblast progenitors followed by collagen deposition. The coadministration of hydralazine with AngII completely inhibited the hypertensive effects of AngII (P⩽0.01) and resulted in minimal cellular infiltration and minimal collagen deposition. These findings were in the context of persistent RAS activation, which was evidenced by elevation in serum aldosterone levels in animals that received AngII or AngII+hydralazine compared with animals that received saline. At the molecular level, infusion of AngII resulted in the significant upregulation of profibrotic factors (connective tissue growth factor-7.8±0.7 fold), proinflammatory mediators (TNFα-4.6±0.8 fold; IL-1β-6.4±2.6 fold) and chemokines (CCL2-3.8±1.0 fold; CXCL12-3.2±0.4 fold), which were inhibited when hydralazine was also infused. We provide evidence that myocardial infiltration by fibroblast progenitor cells secondary to AngII and the resultant fibrosis can be prevented by the addition of hydralazine. Furthermore, the beneficial effects of hydralazine were observed while maintaining RAS activation, suggesting that the mechanism of fibrosis is blood pressure dependent." @default.
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• W2012189743 date "2012-01-19" @default.
• W2012189743 modified "2023-10-14" @default.
• W2012189743 title "Myocardial migration by fibroblast progenitor cells is blood pressure dependent in a model of angII myocardial fibrosis" @default.
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• W2012189743 doi "https://doi.org/10.1038/hr.2011.217" @default.
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