The performed studies covered the effect of tuftsin, tetrapeptide stimulating many components of immunological reactions, to histamine concentration in lungs, kidneys, liver, duodenum as well as in the blood of rabbits and guinea-pigs. Tuftsin was given intravenously in a single injection (0.5 mg/kg), and for guinea-pigs also in one-hour infusion (1.0 mg/kg/h). The tissue designed for determining the histamine concentration by spectrofluorimetric method were taken 1 hour after introduction of the peptide. It has been found out that tuftsin changes the histamine concentration in tissues, lowering it in the lungs, and elevating it in the kidneys and liver. The changes in duodenum and blood were insignificant.
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