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[Static and dynamic pH-dependent components of calcium exchange in the fraction of smooth muscle sarcolemma vesicles].

It is proved that in the fraction of inverted vesicles of the myometrium sarcolemma there are two components of calcium metabolism which depend on the proton concentration in the incubation medium. The first component, a static one, identified under alkalization of the incubation medium from pH 6.0 up to pH 8.0 under equilibrium conditions (Ca2+ concentration inside and outside vesicles is the same) is manifested as an increase of the calcium capacity of vesicles at the expense of Ca2+-binding centres of the inner surface of membrane vesicles. The second component, a dynamic one, is represented as a passive transmembrane flow of Ca2+ outflowing from the vesicles induced by alkalization of the extravesicle space. Alkalization-stimulated Ca2+ release from vesicles is analyzed kinetically. Possible functional role of two components of pH-dependent metabolism of Ca2+ in providing the electrical and pharmacological-mechanical conjugation in the smooth-muscular tissue is under discussion.