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The distribution of guanylate cyclase, phosphodiesterase, and NADPH-diaphorase [nitric oxide (NO) synthase] was studied in rat brain both at the light and electron microscopic level with special emphasis on the vascular system. We showed that the cGMP-generating enzyme is located in cells (glial cells and pericytes) surrounding cerebral vessels, but not in the endothelium. For NO synthase, a dual localization was observed. The enzyme is present in parts of the endothelium and in nerve endings apparently innervating larger brain vessels. We propose, therefore, that NO acts on guanylate cyclase both from a "synaptic" and endothelial source.
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