PMID: 87242May 11, 1979

Transmitter histochemistry of the rat olfactory bulb III. Autoradiographic localization of [3H]GABA

Brain Research
N HalászTomas Hökfelt


The distribution of [3H]gamma-aminobutyric acid (GABA) labeled elements in rat olfactory bulb was studied by light and electron microscopic autoradiography. [3H]GABA was strongly taken up into glial cells and pericytes in all layers of the bulb. The neuronal uptake of [3H]GABA was mainly seen in certain types of nerve terminals. About one-third of the granule dendritic terminals, some nerve endings of short axon cells, and certain nerve endings of extrabulbar origin showed a strong labeling. Labeling was seen in a small population of the periglomerular, short axon and granule cell bodies. Most cell bodies of these 3 types as well as the mitral cells did not, however, accumulate any appreciable amo9nt of [3H]GABA. The labeling pattern seen after injection of [3H]glycine and [3H]leucine was clearly different from the pattern seen after [3H]GABA injection. The labeling was more uniformly distributed over the components of the neuropil with a considerably higher activity over certain cell somata such as the mitral cells. The present results demonstrate that neuronal uptake and accumulation of [3H]GABA occur into populations of olfactory bulb cells and processes, which from neurophysiological and/or immunohistochemical studies are s...Continue Reading


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