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Localization of metallothionein in female reproductive organs of rat and guinea pig

N Nishimura, H Nishimura and C Tohyama

Department of Hygiene, Aichi Medical University, Japan.

We demonstrated the localization of metallothionein (MT) in rat uterus and ovaries and in guinea pig mammary glands. During the cyclic changes from one estrous period to the next, strong MT immunostaining was found in the glandular epithelium of the endometrium and weak immunostaining was observed in the simple columnar epithelium. Interestingly, during estrus, the intensity of MT immunostaining decreased in the cytoplasm, whereas during metestrus, diestrus, and proestrus the intensity of strong and similar immunostaining was observed in both the cytoplasm and nucleus. During proestrus and estrus, the number of vaginal epithelial cells containing MT increased on the luminal side of the epithelium and inside the lumen. In rat ovary, strong immunostaining was observed in the cytoplasm and nucleus of granulosa-lutein cells of the corpus luteum and in the cytoplasm of the ovum. In mammary gland of non-pregnant guinea pig, very strong but scattered MT immunostaining was demonstrated in both cytoplasm and nucleus of some epithelial cells of the lactiferous ducts. The mammary tissue of the pregnant guinea pig showed an increase in MT staining in alveolar cells that had proliferated due to pregnancy. The presence of MT in the female reproductive organs, the tissues of which actively grow under the control of female sex hormones, indicates some as yet unknown association of MT with cell proliferation and differentiation.

Volume 37, Issue 11, pp. 1601-1607, 11/01/1989
Copyright © 1989 by The Histochemical Society


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