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[Prostaglandins and cyclic nucleotides in the dynamic development of an experimental poisoning syndrome caused by Yersinia pestis lipopolysaccharide].

This work deals with the influence of Y. pestis lipopolysaccharide (LPS), introduced intraperitoneally in a dose of 2 LD50, on the content of prostaglandins (PG), such as PGE, PGF2 alpha and 6-keto-PGF1 alpha, thromboxane, cAMP and cGMP in the liver, lungs and blood plasma of guinea pigs in the process of the development of experimental intoxication. The content of thromboxane in blood plasma increased 2.4-fold in 2 hours after intoxication and remained elevated for as long as 5 hours. Other parameters of blood plasma remained unchanged. The data obtained in this investigation indicate that thromboxane, known as a regulator of thrombogenesis, may induce early disturbances in microcirculation. A change in the content of PG was shown to occur in pulmonary tissue 2 and 5 hours after the beginning of intoxication. The content of PG in liver tissue was found to occur at a later period of the toxic action. The concentration of cyclic nucleotides (CN) in the tissues under study sharply increased even at the initial stage of the development of shock in guinea pigs. The effect of LPS on the metabolism of PG and CN, revealed in this investigation, resembles the effect produced by the thermostable fraction of "mouse" toxin.