Abstract
Ultrastructural distribution of NADPH-diaphorase (NADPH-d) in olfactory epithelium and bulb of the carp Cyprinus carpio L. was studied using light and electron microscopy. The diaphorase staining was revealed in the supranuclear area of the sensory and indifferent epithelium, in the olfactory nerve, as well as in the outer layers of the olfactory bulb—in fibers and glomeruli. NADPH-d-positive neurons were found in the interglomerular neuropil. Electron microscopy showed that NADPH-d in the olfactory lining epithelium was related only to receptor cells and ciliary supporting cells and was present in submembranous structures. Besides, in both parts of the olfactory system the main, cytosolic part of the enzyme is bound to cytoskeleton and is also present in membranes of endoplasmic reticulum and in mitochondria. In general, the NADPH-d of the carp olfactory system is characterized by predominantly intracellular localization and widespread contacts of the enzyme with cytosol.
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