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Immunoelectron microscopic localization of an oviductal antigen in hamster zona pellucida by use of a monoclonal antibody

FW Kan, S St-Jacques and G Bleau

Department of Anatomy, Faculty of Medicine, University of Montreal, Quebec, Canada.

The zona pellucida is an extracellular matrix of glycoproteins which surrounds the mammalian oocyte and preimplantation embryo. We have recently developed monoclonal antibodies against oviductal zona pellucida of the golden hamster. We applied the post-embedding immunocytochemical method using a monoclonal antibody (IgGl,k) to determine the precise location of antigenic sites in the cumulus oophorus complex of the superovulated hamster. By applying the high- resolution protein A-gold technique, we demonstrated that the sites of immunoreactivity were exclusively in the zona pellucida encompassing the oocyte. Other structures within the oocyte and neighboring cumulus cells were not labeled by gold particles. Moreover, gold particles were evenly distributed throughout the entire thickness of the zona pellucida, indicating that this extracellular layer is at least in part made up of an antigen recognized by the monoclonal antibody that is uniformly distributed in the zona matrix.

Volume 36, Issue 11, pp. 1441-1447, 11/01/1988
Copyright © 1988 by The Histochemical Society


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