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Growth hormone and prolactin were localized on thin plastic sections of rat anterior pituitary gland and mammosomatotropic tumor MtTW15 that were fixed with osmium tetroxide (alone,mixed with aldehydes, or after aldehydes). Intense immunocytochemical staining for both antigens was obtained after plastic was removed from sections with an alcoholic solution of sodium hydroxide. The results indicated that antigenic determinants of rat prolactin and growth hormone were not completely destroyed or inactivated by fixation with osmium and embedment in epoxy resin, and that removal of the polymerized epoxy resin was necessary to obtain light microscopic postembedding immunocytochemical staining of these antigens. The results also demonstrated that tissues which have been conventionally processed for morphological evaluation by electron microscopy may be suitable for postembedding immunocytochemical staining of some antigens for light microscopy.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Immunocytochemistry with osmium-fixed tissue. I. Light microscopic localization of growth hormone and prolactin with the unlabeled antibody-enzyme method.