Disorders in connections of the hypothalamic-pituitarygonadal axis in rats with Guerin’s carcinoma against the background of induced hypothyroidism

Abstract

Aims: to study the content of regulatory peptides in the hypothalamus and pituitary gland, as well as sex steroids in the gonads in rats of both sexes with Guerin’s carcinoma against the background of hypothyroidism. Materials and methods. Our experiment was performed in white outbred rats of both sexes with induced hypothyroidism, against the background of which Guerin’s carcinoma was transplanted. In 1% homogenates of the pituitary and the hypothalamus and in 10% homogenates of the gonads in the animals from the main and reference groups, the levels of GnRH (Casabio, China) were determined by the ELISA method using standard kits, and the content of LH, FSH, estradiol (E2), testosterone (T) and progesterone (P4) by the RIA method (Immunotech, Czech Republic). Statistical analysis of the results was performed using the Statistica 10.0 software package. Results. In females of the main group, the level of GnRH in the hypothalamus increased by 1.6 times, but the content of LH and FSH in the pituitary gland decreased, while in males the content of GnRH decreased by 1.4 times and FSH by 1.6 times compared with the intact animals. In the gonads of females of the main group, the content of E2 and T decreased by 1.3 times, but the level of P4 increased by 4.7 times, while in males the T production decreased by 7.1 times. Hypothyroidism, against the background of which Guerin’s carcinoma developed, had a significant effect both on the central links of the HPG axis and the peripheral ones, producing an additional hormonal imbalance in sex steroids