Abstract:
The cellular distribution of two calcium binding proteins were investigated by peroxidase - antiperoxidase method with the aid of monoclonal antibody specific for calbindin-D28K (CaLB) and parvalbumin (PV) in the brain of the treeshrews, Tipaia glis. Eight adult treeshrews weighing 130-200 gm were divided into 4 groups : CaLB - cross section, CaLB - sagittal section, PV - cross section and PV - sagittal section. The result found that immunoreactive CaLB and PV have a widespread distribution throughout the brain and were present in most of the neuronal cell groups. The immunoreactivity was observed within the perikarya, dendrites and axons. The two proteins are generally expressed in different neurons with some neurons containing both proteins such as Purkinje cell of cerebellum and neurons in neurons in trapezoid nucleus. In this study, CaLB neurons are prominent in thalamus, hypothalamus, limbic system, sensory system, superior olive, olfactory system, trapezoid nucleus, medial geniculate nucleus, visual system. PV neurons are prominent in pyramidal system, reticular formation, cerebellar nuclei, cerebellar cortex, cerebral cortex, vesibular system, hippocampal formation and extrapyramidal system. These two proteins were limited primarily to neuronal element and some ependymal cells, and were absent in glial cells. It can be concludes from this study that these two proteins are distributed almost in differrent neuronal cell groups.