Abstract
The paper presents results of a cytochemical study of localization of phosphatase responsible for hydrolysis of inositol 1,4,5-triphosphate (ITP) in the olfactory lining of true sturgeons (the sturgeon, starred sturgeon, and sterlet). Reaction products as a dark discrete granules are localized in the apical parts of epithelium, practically in the same manner in all the species studied. The precipitate is found on the plasma membranes of cilia, microvilli, and clava of the olfactory cells. Occasionally, the precipitate is also found in the cilia, basal bodies, and rootlets of microvillar cells. The ITP-hydrolyzing phosphatase is supposed to restrict development of transduction process by removing excess messengers from the operating system. The data obtained indicate that in the true sturgeons, the phospholipase cascade of olfactory transduction is concentrated predominantly in the cilia and microvilli of olfactory cells.
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