Paulose,C S; Dakshinamurti,K(Department of Biotechnology, April 24, 1984)
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Abstract:
The high-affinity of [3H]y-aminobutyric acid (GABA) to GABAA receptors and [3H]baclofen to
GABAB receptors were studied in the cerebellum of pyridoxine-deficient rats and compared to
pyridoxine-supplemented controls. There was a significant increase in the maximal binding ( Bmax) of both
GABAA and GABAB receptors with no significant difference in their binding affinities (Kd). The changes
observed suggest a supersensitivity of GABAA and GABAB receptors which seems to correlate negatively
with the concentration of GABA in the cerebellum of pyridoxine-deficient rats.
Biju,M P; Paulose,C S(Department of Biotechnology, 2000)
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Abstract:
The present thesis is an attempt to understand the role of GABA, GABAA and GABAB receptors in the regulation of liver cell proliferation using in vivo and in vitro models. The work also focuses on the brain GABAergic changes associated with normal and neoplastic cell growth in liver and to delineate its regulatory function. The investigation of mechanisms involving mitogenic models without cell necrosis may contribute our knowledge about both on cell growth, carcinogenesis, liver pathology and treatment. Objectives of the present study are, to induce controlled liver cell proliferation by partial hepatectomy and lead nitrate administration and uncontrolled cell proliferation by N-nitrosodiethylamine treatment in male Wistar rats, the changes in the content of GABA, GABAA,GABAB in various rat brain regions. To study the GABAA and GABAB receptor changes in brain stem, hypothalamus, cerebellum and cerebral cortex during the active cortex during the period of active DNA synthesis in liver of different experimental groups. The changes in GABAA and GABAB receptor function of the brain stem, hypothalamus and cerebellum play an important role sympathetic regulation of cell proliferation and neoplastic growth in liver. The decrease in GABA content in brain stem, hypothalamus and cerebellum during regeneration and neoplasia in liver. The time course of brain GABAergic changes was closely correlated with that of heptic DNA synthesis. The functional significance of these changes was further explored by studying the changes in GABAA and GABAB receptors in brain.