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    188宝金博页面版: Regulation of RNA polymerase activity in liver and brain cell nuclei by a cytoplasmic thyroxine modulator in rats of various age

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    内容提示： 820 Bulleffn of Experimental Biology and Medicine, Vol. 116, 17_o 7, July, 1993 ences concern hormones involved in the regulation of stress reactions and in the redistribution of en- ergy resources in stressed and hypoxic animals. The LR and HR groups did not differ significantly in blood levels of testosterone. REFERENCES 1. J. Tepperman and H. Tepperman, Metabolic and Endo- crine Physiology, Chicago (1987). 2. G. N. Chemobaeva and L. D. Lukyanova, in: Pharmaco- logical Correction of I-Iypoxic States [in ...

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    820 Bulleffn of Experimental Biology and Medicine, Vol. 116, 17_o 7, July, 1993 ences concern hormones involved in the regulation of stress reactions and in the redistribution of en- ergy resources in stressed and hypoxic animals. The LR and HR groups did not differ significantly in blood levels of testosterone. REFERENCES 1. J. Tepperman and H. Tepperman, Metabolic and Endo- crine Physiology, Chicago (1987). 2. G. N. Chemobaeva and L. D. Lukyanova, in: Pharmaco- logical Correction of I-Iypoxic States [in Russian], Moscow (1989), pp. 160-164. 3. G. Barseghian and R. Zevine, Endocrinology, 106, 547- 552 (1980). 4. J. D. Baxter and P. H. Forsham, Amer. ZMed., 53, 573- 589 (1972). 5. Neurosteroids and Brain Function, New York (1991). 6. T. Purshottam and M. Chosh, Aerospace Med., 43, N. o 6, 610 (1972). 7. D. Wititsuwannakul and K. Kim, Biochem. Biophys. l~es. Commun., 76, 86-92 (1977). Regulation of RNA Polymerase Activity in Liver and Brain Cell Nuclei by a Cytoplasmic Thyroxine Modulator in Rats of Various Ages Ya. Kh. Turakulov, S. N. Dalimova, I. R. Kamalieva, G. D. Umarova, and B. A. Atakhanova UDC 577/14/..02:577.123.5:599.323.4 Translated from Byulleten" Eksperimental'noi Biologii i Meditsiny, Vol. 116, No_ 7, pp. 48-49, July, 1993 Original article submitted February 11, 1993 Key Words: ontogeny; modulator; thyroxine; RNA polymerase Hormones play important roles in the regulation of the morphological and functional differentiation which cells undergo during ontogeny. The role of the thyroid hormones in this differentiation con- sists essentially in the activation of protein synthe- sis in cell nuclei and ribosomes via the nuclear hormone-receptor complex [4,12]. However, regu- lation of metabolic processes by the thyroid also occurs at the level of numerous membrane struc- tures of the ceil, as is indicated by the presence of highly specific binding sites for thyroid hor- mones in mitochondria [10], cytosol [6], and on plasma membranes [8]. Most of the published in- formation on receptor structures of thyroid hor- mones has been obtained in studies of mature or- Institute of Biochemistry, Uzbek Academy of Sciences, Tashkent gamsms. The number of investigations examining thyroid hormone receptors in the course of ontog- eny is small. The best studied are nuclear recep- tors of developing tissues [5], and there is some scant information about receptors localized in the cytosol and other cell organeUes [1]. Previously, we identified a thyroxine-binding protein designated thyroxine modulator, or TaM , that mediates certain effects of thyroxine in the nucleus and mitochondria [2,3]. The present study was undertaken to compare the effects of this modulator on RNA polymerase activity in liver and brain cell nuclei of rats during ontogeny. MATERIALS AND METHODS For the experiments, 20-day hyperthyroid embryos and 7-, 20-, 45-, and 90-day-old rats of the 0007-4888/93/0007-0820:$12.50 y Plenum Publishing Corporation

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