The peculiarities of hormonal background in boars under correction of reproductive capacity by gadolinium orthovanadate nanoparticles

Abstract

Determination of the influence of redox nanomaterials on the body of males is of great interest to researchers, because the basis of the pathogenesis of male infertility is oxidative stress. A necessary condition in the development of such drugs is the absence of toxic effects on sexual function. It has been proved that nanomaterials based on oxides of rare earth elements have a positive effect on reproductive capacity and, at the same time, they are not gonadotoxic. A comprehensive approach is of particular importance in order to justify their use as a means of reproductive capacity correction. Taking into account the toxicity parameters the mechanisms of their action need to be studied at the biochemical, morphological and clinical levels. The positive effect of gadolinium orthovanadate nanoparticles on the quality of boar sperm (especially in terms of motility and the number of motile sperm in the ejaculate) with an effective reduction of the oxidative load on the body have been shown. The aim of this study was to determine the effect of these nanoparticles on the hormonal background of males with a decreased reproductive capacity under oxidative stress. Thus, the administration of hydrosol of gadolinium orthovanadate nanoparticles for 14 days revealed a normalization of sex hormones – an increase in total testosterone, in particular, on the 15th day of the study – by 22.6 % (P ˂ 0.01), and on the 30th day – by 77.4 % (P ˂ 0.001) compared with the group of animals before the administration. There was a decrease in the level of 17β-estradiol on the 30th day – by 25.0 % (P ˂ 0.01), which almost reached the values of the control group. A decrease in the content of globulin testosterone-estradiol-binding in boars of the experimental group, in particular, on the 15th day of the experiment – by 13.0 % (P ˂ 0.05), and on the 30th day – by 26.8 % (P ˂ 0.001) was determined, which, in turn, led to an increase in androgen saturation of the animal body – the index of free androgens at the end of the study was 43.2 %. The results are explained by the properties of the nanoparticles. Correcting oxidative stress, they increase the antioxidant potential, thereby normalizing the activity of endocrine glands and ways of regulating the germ-endocrine function of the gonads. The prospect of further research is to elucidate the effect of the correction of decreased reproductive capacity in boars under oxidative stress by nanoparticles of oxides of rare earth elements on the morphological state of the gonads.