Histoenzymological localization of glycerol 3 phosphate dehydrogenase and succinate dehydrogenase in the mesencephalon of a minor carp Barilius bendelisis (Hamilton)

Abstract

This contribution deals with the studies on histoenzymological localization of two oxtdative enzymes, glycerol 3 phosphate dehydrogenase (G 3PD; EC 1.1.1.8) and succinate dehydrogenase (SD; EC 1.3.99:1) in the mesencephalic nuclei and fibre tracts of a minor carp Barilius bendelisis. The nuclear areas exhibit weak to moderate concentration. High activities have been observed in the retinic fibrous layer of stratum opticum (STOR), stratum album centrale (STRAC) of optic tectum and nearly all fibre tracts which also show similar pattern of activities of both dehydrogenases. In the brain of B. bendelisis, 63 PD appears to help in the biosynthesis and maintenance of myelin; glucose seems to be chief energy molecule being metabolised first anaerobically in cytoplasm and then aerobically in mitochondria. Pentose shunt pathway also possibly exists to supplement the main energy cycle during exigencies.