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TGF?2 and TGF?3 mediate appropriate context-dependent phenotype of rat valvular interstitial cells.


ABSTRACT: This study focused on characterizing the potential mechanism of valvular toxicity caused by TGF? receptor inhibitors (TGF?Ris) using rat valvular interstitial cells (VICs) to evaluate early biological responses to TGF?R inhibition. Three TGF?Ris that achieved similar exposures in the rat were assessed. Two dual TGF?RI/-RII inhibitors caused valvulopathy, whereas a selective TGF?RI inhibitor did not, leading to a hypothesis that TGF? receptor selectivity may influence the potency of valvular toxicity. The dual valvular toxic inhibitors had the most profound effect on altering VIC phenotype including altered morphology, migration, and extracellular matrix production. Reduction of TGF? expression demonstrated that combined TGF?2/?3 inhibition by small interfering RNA or neutralizing antibodies caused similar alterations as TGF?Ris. Inhibition of TGF?3 transcription was only associated with the dual TGF?Ris, suggesting that TGF?RII inhibition impacts TGF?3 transcriptional regulation, and that the potency of valvular toxicity may relate to alteration of TGF?2/?3-mediated processes involved in maintaining proper balance of VIC phenotypes in the heart valve.

SUBMITTER: Wang F 

PROVIDER: S-EPMC7900227 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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This study focused on characterizing the potential mechanism of valvular toxicity caused by TGFβ receptor inhibitors (TGFβRis) using rat valvular interstitial cells (VICs) to evaluate early biological responses to TGFβR inhibition. Three TGFβRis that achieved similar exposures in the rat were assessed. Two dual TGFβRI/-RII inhibitors caused valvulopathy, whereas a selective TGFβRI inhibitor did not, leading to a hypothesis that TGFβ receptor selectivity may influence the potency of valvular toxi  ...[more]

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