[Effect of fluoroaluminate on the passive transport of calcium in the plasma membrane fraction of the pig myometrium].

Study of the effect of aluminium, fluoride-ions and fluoroaluminium on the passive transport of Ca2+ through the plasma membrane of the myometrium cells has shown that 10 microM of Al3+, 1 mM of F- and the both ions taken in the mentioned concentrations do not affect this process. At the same time 10 mM of F- as well as 10 microM of Al3+ together with 10 mM of F- inhibit a passive output of calcium from vesicles. The results obtained suppose that inhibitory regulation of the passive transport of calcium in the myometrium sarcolemma is executed through Gi-protein.

[Inhibiting effect of ADP-ribosylation by pertussis toxin on passive transport of Ca2+ into the cell membrane of porcine myometrium].

ADP-ribosylation by whooping cough toxin of protein components of inside-out oriented vesicles of pig myometrium plasma membranes under conditions of their depolarization results in significant inhibition of passive transport of Ca2+ ions. The inhibiting effect is dose- and time-dependent. rho-Chloromercuribenzoate (0.

[Comparative evaluation of the glycosaminoglycan composition in plasma membranes of normal and transformed mouse liver cells].

Using electrophoresis in agarose gel, a comparative study of composition of membrane-bound glycosaminoglycans (GAG) from normal mouse liver cells and from o-aminoazatoluene-induced mouse hepatoma cells was carried out. Differences in the composition and localization of GAG were revealed. The plasma membrane fraction of hepatoma cells contained no GAG; the bulk of GAG (approximately 98%) was localized in the plasma membrane free fraction.