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Immunohistochemical localization of procollagens. I. Light microscopic distribution of procollagen I, III and IV antigenicity in the rat incisor tooth by the indirect peroxidase-anti-peroxidase method

I Cournil, CP Leblond, J Pomponio, AR Hand, L Sederlof and GR Martin

Frozen sections of the growing end of the rat incisor tooth were exposed to antisera or affinity prepared antibodies against partially purified type I, II, or IV procollagen in the hope of detecting the location of the corresponding antigens by the peroxidase-anti- peroxidase technique. The distribution of immunostaining was similar with antisera as with purified antibodies of a given type, but differed for each type; that is, predentin, odontoblasts, pulp and periodontal tissue were the sites of type I; blood vessel walls, pulp and periodontal tissue, of type III; and basement membranes, of type IV antigenicity. It was demonstrated, at least in cases of type I and III, that immunostaining detected the corresponding procollagens and related substances, but not the corresponding collagens. The interpretation of these observations is that: 1) odontoblasts elaborate procollagen I for release to predentin and subsequent transformation to dentinal collagen I; 2) pulp and periodontal cells produce procollagens I and III which presumably become collagens I and III respectively, while the adventitial cells of blood vessels give rise to collagen III; and 3) procollagen IV is associated with basement membranes and, occasionally, adjacent cells.

Volume 27, Issue 7, pp. 1059-1069, 07/01/1979
Copyright © 1979 by The Histochemical Society


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