Add time:08/26/2019         Source:sciencedirect.com

This report demonstrates that the commonly used buffering agent Tris(hydroxymethyl)aminomethane (Tris) in concentrations of 5 and 30 mM inhibits calcium (Ca2+) uptake in both rat aortic and portal venous smooth muscle. The data indicates that total exchangeable Ca2+ in portal vein is reduced by about 35% in 5 or 30 mM Tris, while the intracellular exchangeable Ca2+ is not significantly altered. On the other hand, in aortic smooth muscle, while 30 mM Tris reduces total exchangeable Ca2+ by about 20%, intracellular Ca2+ is reduced by 44% in 5 mM Tris and by 55% in 30 mM Tris. The present studies, thus, reveal that Tris exerts significant inhibitory effects on exchangeability and transmembrane movement of Ca2+ in at least two different types of smooth muscle.

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