[Conditions for optimal production of active oxygen forms by rat polymorphonuclear leukocytes].

Using the procedure of lysis by ammonium chloride followed by differentiation centrifuging, the fraction of cells containing polymorphonuclear leucocytes was isolated from the whole rat blood to study the conditions of optimal production of oxygen forms was determined from the chemiluminescent cell response in the presence of luminol. It was shown that chemiluminescent cell response depends on the temperature, pH and osmolarity of the medium as well as on the presence of various concentrations of Ca2+ in the incubation medium. The maximal chemiluminescent response of polymorphonuclear leucocytes was observed at 35-37 degrees C, pH 7,6, osmolarity of 0,15 and Ca2+ concentration of 5-10 mM.

Strontium excitability of the inner mitochondrial membrane: regenerative strontium-induced strontium release.

Regenerative Sr(++)-induced Sr++ release from isolated rat liver mitochondria was studied using ion-selective electrode techniques. Mitochondria, when exposed to a pulse of Sr++, demonstrated a reversible and transient increase in inner membrane permeability to K+ and H+ ions. The increase in permeability was an all-or-none process with a threshold dependent on the amplitude of the Sr++ pulse.

Participation of endogenous fatty acids in Ca2+ release activation from mitochondria.

A correlation between the rate of H+/Ca2+ exchange and the content of free fatty acids in mitochondria has been found. Fatty acids were isolated from mitochondria with different activities of H+/Ca2+ exchange. It has been shown that these free fatty acids are able to induce Ca2+ release in exchange to protons after being added to freshly isolated mitochondria.

[Effect of bivalent metal ions on the fluctuations of ion currents in rat liver mitochondria].

Ions of bivalent metals are shown to arrange in the Sr2+ greater than Ca2+ greater than Ba2+ greater than Mn2+ series as to their ability to induce ion flow vibration in the rat liver mitochondria. Application of Sr2+ results in the most stable prolonged vibrations of ion flows in mitochondria. Ca2+, Ba2+ and Mn2+ induce slightly pronounced and intensively damped vibrations.

[Effect of trimecaine, ajmaline, stenopril and chloracizine on fluctuations in K+ currents in rat liver mitochondria].

Antianginal hypotensive preparations chloracyzin and stenopryl, antiarrhythmic aimalin as well as local anesthetic and antiarrhythmic trimekaine hydrochloride were studied for their effect on the K+ inflow and outflow rate in the rat liver mitochondria during Sr2+-induced vibrations. In spite of differences in the chemical structure and pharmacological effect, all these substances are shown to uniformly suppress ion flow vibrations in mitochondria, inhibiting K+ outflow. It is found that the inhibition of the K+ outflow rate depends on the concentration of the preparations.