Nucleolar organizer regions activity in women with ovarian endometriosis and infertility

Objective. To determine the activity of ribosomal synthesis and its connection with the level of melatonin in women with ovarian endometriosis and infertility. Patients and methods. The study included 49 women with ovarian endometriosis, who were divided into 2 groups: group 1 – 22 women with ovarian endometriosis and infertility, group 2 – 27 women with ovarian endometriosis without infertility. Medical history was collected from all women, who underwent therapeutic and diagnostic laparoscopy, the chronobiological type, the level of 6-sulfatoxymelatonin (aMT6s) in a first morning urine sample and the activity of nucleolar organizer regions in the foci of endometrioid heterotopias of the ovaries were determined. Results. It was found that the level of urinary 6-sulfatoxymelatonin was significantly reduced in patients with ovarian endometriosis and infertility compared to patients with endometriosis without infertility. In group 1, its level was 40.29 ± 7.25 ng/mL, in group 2 – 78.46 ± 15.46 ng/mL (p = 0.044). In patients with ovarian endometriosis and infertility, there was a moderate increase in the activity of ribosomal synthesis due to an increase in the number of intranucleolar inclusions against the background of decreased level of melatonin. In patients of group 2, with a decrease in the level of melatonin, ribosomal synthesis was activated by increasing the number of extranucleolar inclusions. This characterizes the high activity of ribosome synthesis in the cell. Conclusion. In women with ovarian endometriosis and infertility, against the background of low melatonin level, there was an increase in the activity of ribosomal synthesis in the cells of ovarian endometriotic formations. Key words: nucleolar organizer regions activity, melatonin, ovarian endometriosis