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• W2034707110 abstract "A close link between arsenic exposure and hypertension has been well-established through many epidemiological reports, yet the mechanism underlying it remains unclear. Here we report that nanomolar concentrations of monomethylarsonous acid (MMA(III)), a toxic trivalent methylated arsenic metabolite, can potentiate agonist-induced vasoconstriction and pressor responses. In freshly isolated rat aortic ring, exposure to nanomolar MMA(III) (100-500 nM) potentiated phenylephrine (PE)-induced vasoconstriction while at higher concentrations (≥2.5 μM), suppression of vasoconstriction and apoptosis of vascular smooth muscle were observed. Potentiation of agonist-induced vasoconstriction was also observed with other contractile agonists and it was retained in endothelium-denuded aortic rings, suggesting that these events are agonist-independent and smooth muscle cell dependent. Interestingly, exposure to MMA(III) resulted in increased myosin light chain phosphorylation while PE-induced Ca2+ influx was not affected, reflecting that Ca2+ sensitization is involved. In line with this, MMA(III) enhanced agonist-induced activation of small GTPase RhoA, a key contributor to Ca2+ sensitization. Of note, treatment of MMA(III) to rats induced significantly higher pressor responses in vivo, demonstrating that this event can occur in vivo indeed. We believe that RhoA-mediated Ca2+ sensitization and the resultant potentiation of vasoconstriction by MMA(III) may shed light on arsenic-associated hypertension." @default.
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• W2034707110 date "2011-09-01" @default.
• W2034707110 modified "2023-09-24" @default.
• W2034707110 title "Potentiation of vasoconstriction and pressor response by low concentration of monomethylarsonous acid (MMAIII)" @default.
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• W2034707110 doi "https://doi.org/10.1016/j.toxlet.2011.06.008" @default.
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