Study of the differentiation of secretory cells in the golden hamster oviductal epithelium by use of a monoclonal antibody

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Abstract
The ontogeny of an oviductal zona pellucida glycoprotein, designated ZP‐0, in the golden hamster oviductal epithelium was investigated by means of light and electron microscopic immunolabeling studies using a monoclonal antibody. Light microscopic immunohistochemistry showed that ZP‐0 appeared in the oviductal epithelium from 9.5 to 10.5 days after birth. At first, ZP‐0 appeared in the Golgi region of the epithelial cells, and then increased in amount as development progressed to fill the supranuclear cytoplasm. Electron microscopic observations showed that rough endoplasmic reticulum and Golgi apparatus were well developed in non‐ciliated cells of the ampullar and isthmic segments at 10.5 days after birth. Secretory granules appeared near the Golgi apparatus and markedly increased in number until 15.5 days after birth. Ultrastructural immunocytochemistry showed that ZP‐0 appeared in the well‐developed Golgi apparatus and then was stored within the secretory granules of developing secretory cells. ZP‐0 was never present in the ciliated cells. These results indicate a coincidence between the beginning of ZP‐0 biosynthesis and the morphological cytodifferentiation of secretory cells in the golden hamster oviduct during postnatal development. This leads us to the conclusion that ZP‐0 is a possible differentiation marker of the golden hamster oviductal secretory cell.