Influence of malignant growth and chronic neurogenic pain on neurosteroid levels in rat brain

Frantsiyants E.M.1, Bandovkina V.A.1, Kaplieva I.V.1, Cheryarina N.D.1, Surikova E.I.1 , Neskubina I.V.1, Kotieva I.M.1, Shalashnaya E.V.1, Trepitaki L.K.1

1. National Medical Research Centre for Oncology, Rostov-on-Don, Russia
Section: Experimental Study
DOI: 10.18097/PBMC20206602151      PubMed Id: 32420896
Year: 2020  Volume: 66  Issue: 2  Pages: 151-155
The aim of the study was to determine the level of sex steroid hormones in white matter of the brain of rats with tumors combined with chronic neurogenic pain (CNP), which was modeled by bilateral sciatic nerve ligation. The study included albino male rats (n=74). In the main group, M1 sarcoma was transplanted subcutaneously (n=11) or into the subclavian vein (n=11) 45 days after CNP modeling. Two comparison groups (n=13 each) included sham operated animals (without CNP) with M1 sarcoma transplanted subcutaneously and intravenously. Control groups included animals with CNP and sham operated animals. Rats were euthanized on day 21 of the carcinogenesis. Levels of total and free testosterone (T), estrone (E1), estradiol (E2), estriol (E3) and progesterone (P4) in the brain white matter were measured using ELISA kits (“Cusabio”, China). CNP caused a decrease in the total and free T by 1.5 times (p<0.05), E2 and P4 by 1.9 and 3 times, respectively, E3 by 1.6 times (p<0.05), as well as an increase in E1 by 1.4 times (p<0.05) as compared to the corresponding levels in the brain white matter of rats without CNP. CNP stimulated M1 sarcoma growth in both subcutaneous and intravenous transplantation. Regardless of the tumor site, the dynamics of total T, E2 and E3 in the brain had similar features, but the dynamics of free T, P4 and E1 differed. Thus, changes in the level of neurosteroids in the white matter of rat brain with CNP and tumor growth alone or associated with CNP are a reaction to stress.
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Keywords: sex steroid hormones, brain, rats, chronic neurogenic pain, M1 sarcoma

Frantsiyants, E. M., Bandovkina, V. A., Kaplieva, I. V., Cheryarina, N. D., Surikova, E. I., Neskubina, I. V., Kotieva, I. M., Shalashnaya, E. V., Trepitaki, L. K. (2020). Influence of malignant growth and chronic neurogenic pain on neurosteroid levels in rat brain. Biomeditsinskaya Khimiya, 66(2), 151-155.
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