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Revista chilena de anatomía

Print version ISSN 0716-9868


VASQUEZ, B. et al. IMMUNOCYTOCHEMICAL LOCALIZATION OF THE CBG-like IN THE MAMMALIAN FEMALE REPRODUCTIVE SYSTEM. Rev. chil. anat. [online]. 2000, vol.18, n.1, pp.109-116. ISSN 0716-9868.

The role of the globulin that binds corticoids (CBG) in the induction process of the acrosome reaction, has been clearly shown in vitro in human spermatozoids. This molecule was isolated originally from follicular fluid and its presence was immunologically shown by our group in ovarian follicles, uterine tubular epithelium and human and bovine endometrium. These results has led us to perform other studies to demonstrate its presence in other mammals. Our hypothesis being that if this molecule is involved in the mechanisms previous to fertilization in human and bovine species, its presence could also have a modulator role in species with similar gamete interaction. The objective of the present study was to determine the presence and distribution of a CBG-like molecule by immunocytochemistry in the reproductive system of pigs, dogs, cats, rabbits and rats. All samples were taken in every stage of the reproductive cycle for every species from surgical intervention except for the pig which was obtained from a local slaughterhouse (abattoir). Ovary, uterine tube and uterus samples were processed to the immunocytochemistry (ICQ) with anti hCBG poly and monoclonal antibodies (Ab) which recognized common antigens of the several species involved in the study. The ICQ revealed in every species an intense positive reaction at the level of ovarian follicles, secretory cells from the uterine tube epithelium and in the epithelial cells from the uterine glands and endometrium. Generally, the staining was very intensive near to the ovulatory stage and very scarce at the stages with lower steroid hormone concentration. However, there were differences among several species probably due to antigenic variability of each species in relation to the generator molecule of the antibody. There was a very interesting result with the animal from which a polyclonal antibody was obtained. This outcome was confirmed by the detection of endogenous CBG determined by an intensive immunoreaction in the controls (without specific antibody), therefore, the only possible source was the generation of its own endogenous antibodies. Our results allow us to suggest the presence of a CBG-like molecule in the species of the present study and that the distribution of this molecule in the morphologic areas of the reproductive system was similar to those found in human and bovine samples which strongly suggest that this molecule could be also involved in their respective reproductive physiology. However, its direct participation in physiological mechanisms such as the acrosome reaction has not been yet shown

Keywords : CBG; Female mammals; Immunocytochemistry; Ovary; Uterus; Uterine tube.

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