MO476EFFECT OF ESTROGEN DEFICIENCY ON THE STATE OF BONE AND MINERAL METABOLISM IN WOMEN WITH STAGE III-V CHRONIC KIDNEY DISEASE

Background and Aims Clinical studies in recent years have revealed a close relationship between hormonal disorders in women with CKD and the duration and quality of life, bone mineral and related disorders of the cardiovascular system. In individual studies, there is a tendency to improve the indicators of mineral and bone metabolism and the state of the cardiovascular system in hormonal or other drug-induced correction of hormonal dysfunctions in women. - Aims to study the effect of estrogen deficiency on bone and mineral metabolism in a population of women suffering from CKD stages III-V Method The study included 52 women who met the clinical criteria for the possible appointment of hormone therapy (both replacement and combined oral contraceptives) for the purpose of a detailed examination of the state of their cardiovascular system and bone-mineral metabolism in dynamics (with an interval of 10-12 months) in order to assess the degree of influence of estrogen-deficient conditions on the course of such common complications of CKD as cardiovascular diseases and pathology of the bone system. The age of the patients ranged from 26 to 61 years (mean age-50.65±9.17 years). The duration of CPN averaged 77.02 months.. The stages of CKD were determined according to the K/DOQI (2012) criteria, and the glomerular filtration rate was calculated using the CKD-EPI formula. The following parameters were evaluated: the concentration of sclerostin, osteoprotegerin, fibroblast growth factor 23 (FGF-23), parathyroid hormone, total calcium, phosphorus, alkaline phosphatase, creatinine, and urea. Follicle-stimulating hormone( FSH), luteinizing hormone(LH) and estradiol were determined by solid-phase chemiluminescent enzyme immunoassay (commercial sets of Alkor-Bio, St. Petersburg). Serum concentrations of sclerostin, sRANKL (soluble RANKL), and osteoprotegerin were determined by the enzyme-linked immunoassay using Biomedica gruppe test systems. Results The examined patients showed hormonal dysfunctions (82%), accompanied by changes in the content of sex hormones: the concentration of estradiol was below normal: 123.4±72.5 pmol/l and 150.0-450.0 pmol/l, respectively, in patients and in normal (p<0.01), which confirms the presence of estrogen deficiency in the examined patients . Concentrations of FSH and LH exceeded the norm in the group of patients as a whole: 91.6±46.1 IU/l and 3.0-8.0 IU/l FSH content in patients and normal; 51.8±32.1 IU/l and 3.0-10.0 IU/l LH in patients and normal. In the group of patients as a whole, an increase in the level of sclerostin to 28.5 ± 9.2 pmol/l was detected ( norm 12±33.45 pmol/l), an increase in the level of osteoprotegerin to 6.9±0.4 pmol/l (norm 2.7 pmol/l). Positive and negative correlations were found between the levels of morphogenetic proteins, sex hormones, and characteristic parameters of hormonal dysfunctions Conclusion Pre-and postmenopausal women with CKD have hormonal dysfunctions, including disorders of sexual and reproductive function, menstrual cycle, decreased fertility, increased risks of miscarriage at its onset, the basis of hormonal dysfunctions is the absence of LH peaks and changes in the concentration of estradiol depending on the phase of the cycle, hypoestrogenemia. It is assumed that there is a pathogenetic link between hormonal dysfunctions and disorders in the system of bone metabolism regulatory proteins in patients with CKD.