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Uptake and intracellular localization of exogenous L-DOPA, L-leucine and their metabolites in the gastro-enteric endocrine cells of the mouse studied by electron microscope autoradiography.

They were killed 1hr and 24hrs after the injection and pieces of the gut were processed for both light and electron microscope autoradiography after fixation in glutaraldehyde followed by post-fixation with osmium tetroxide. At 1hr, a greater number of specific silver grains were found on EC cells than on other types of basal-granulated cells including G, L (EG) and ECL cells. At 24hrs, a considerable number of labels were found on only a few EC cells. Subcellular localization of L-DOPA-3H and its metabolites was studied by electron microscope autoradiography. By 1hr after the injection, specific radioactivity accumulated in the cytoplasm rich in secretory granules. Labeling on the Golgi area was conspicuously lower than in the granule-rich cytoplasm.