[Simultaneous demonstration of glutamate decarboxylase and synaptophysin in paraffin sections of rat cerebellum].

The article presents highly reproducible and inexpensive protocol for simultaneous demonstration of glutamate decarboxylase (GAD67), the key enzyme of gamma-aminobutyric acid (GABA) synthesis and synaptophysin (SYP), a marker protein of synaptic vesicles using confocal laser microscopy. In the cerebellar cortex, GAD labels Purkinje cells and pinceaux in their basal parts and is unevenly distributed in the neuropil of molecular and granular layers. SYP clearly marks the contours of large dendrites of Purkinje cells in molecular layer, while in the granular layers it labels parts of cerebellar glomeruli--the terminals of the mossy fibers. GAD-immunopositive structures (GABA-ergic axons of stellate cells--Golgi cells) are often located at periphery of the glomeruli. In the peripheral zone of the glomeruli, colocalization of GAD- and SYP-immunopositive structures was observed, suggesting the presence of GABA-ergic synapses in this zone.