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Immunohistochemical localization of ornithine aminotransferase in normal rat tissues by Fab'-horseradish peroxidase conjugates

M Kasahara, T Matsuzawa, M Kokubo, Y Gushiken, K Tashiro, T Koide, H Watanabe and N Katunuma

Immunohistochemical localization of ornithine aminotransferase (L- ornithine: 2-oxo-acid aminotransferase, EC 2.6.1.13), a mitochondrial enzyme whose hereditary absence induces gyrate atrophy of the choroid and retina, was elucidated by a direct immunoperoxidase method using Fab'-horseradish peroxidase conjugates. In immunodiffusion studies, the antibodies raised with the re-crystallized enzyme were highly specific to ornithine aminotransferase. To show localization of ornithine aminotransferase in normal rat tissues, clear immunohistochemical staining of this enzyme through the inner mitochondrial membrane in paraffin sections was achieved with Fab'-horseradish peroxidase conjugates. Strong immunoreactivity was present in cerebral neurons, hepatocytes, and epithelial cells of renal tubuli, gut mucous membranes, and ocular tissues. Specific distribution of ornithine aminotransferase was found in ependymal cell groups: namely, epithelial cells of the choroid plexus, pigmented and nonpigmented epithelial cells of the ciliary body. and Muller cells and pigment epithelium of the retina.

Volume 34, Issue 11, pp. 1385-1388, 11/01/1986
Copyright © 1986 by The Histochemical Society


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