Study of the effect of lipophilic cryofractions of spleen and placenta of cattle on mice under conditions of genotoxic action of mitomycin

The aim of this work was to study the antimutagenic and DNA-protective effects of lipophilic cryofractions of bovine spleen and placenta in mice with mitomycin (MM)-induced genotoxicity. The effect of lipophilic cryofraction of bovine spleen (LCSC), lipophilic cryofraction of bovine placenta (LCPC) and their mixture in equal proportions (LCSPC) was studied. Outbred male mice were used in the experiments. The effects of a single administration of the substances separately and simultaneously with an intraperitoneal injection of MM were studied, as well as with three-time administration of the substances with an interval of 24 hours before the administration of MM relative to the negative and positive control groups. Afterwards, bone marrow samples were obtained from the animals for the micronucleus test and liver samples to determine the amount of mitochondrial DNA (mtDNA) damage in the 12S-16S and ND5 fragments. A single administration of LCSC, LCPC and LCSPC reduced the frequency of polychromatophilic erythrocytes with micronuclei (MNPCE) by 4.1, 3.9 and 2.4 times (p < 0.05), respectively, relative to the positive control group mice. With a course of administration of LCSPC, the frequency of MNPCE decreased by 31.3% (p < 0.05) relative to the positive control group. Administration of LCSC and LCSPC reduced the amount of mtDNA damage by 96.5 and 68.3% (p < 0.05), respectively, in the 12S-16S fragment relative to the positive control group mice. A course of administration of LCSPC before MM reduced the amount of mtDNA damage by 52.2% (p < 0.05) in the ND5 fragment. The antimutagenic effect of the studied cryofractions and the DNA-protective effect of LCSC and LCSPC in relation to mtDNA were revealed.

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