title: Effectiveness of zona pellucida protein ZPB as an immunocontraceptive antigen.
abstract: Immunization of female mammals with native zona pellucida (ZP) proteins is known to cause infertility. Since each human ZP protein is now available as a purified recombinant protein, is it possible to compare the immunocontraceptive potential of each ZP protein. A breeding study was conducted in cynomolgus monkeys (Macaca fasicularis) after immunization with recombinant human ZP (rhZP) proteins (ZPA, ZPB, ZPC) separately and in combinations. This study demonstrated that immunization with recombinant human ZPB (rhZPB) protein caused cynomolgus monkeys to become infertile for 9-35 months. A second study was conducted in baboons (Papio cynocephalus), which yielded a similar result. The baboons immunized with rhZPB became infertile for 9 to > 20 months. During the time of maximum antibody titre, some animals experienced disruption of the menstrual cycle, but eventually all of the animals resumed normal menstrual cycles. Control animals and animals immunized with other rhZP proteins all became pregnant before any of the rhZPB-treated animals. This is the first study in which a recombinant ZP protein has consistently induced infertility in a primate without permanent disruption of the normal menstrual cycle.
authors.affiliation: Zonagen, Inc., 2408 Timberloch Place, B4, The Woodlands, TX 77380, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Martinez
authors.forename: J D
authors.initials: JD
authors.lastname: Harris
mesh_terms: D000818:Animals; D000906:Antibodies / Q000097:blood; D003269:Contraception, Immunologic; D004527:Egg Proteins / Q000494:pharmacology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D005298:Fertility / Q000187:drug effects*; D007114:Immunization; D008252:Macaca fascicularis; D008322:Mammals; D008562:Membrane Glycoproteins / Q000494:pharmacology*; D008597:Menstrual Cycle / Q000187:drug effects; D010215:Papio; D011374:Progesterone / Q000097:blood; D011956:Receptors, Cell Surface; D011994:Recombinant Proteins / Q000494:pharmacology; D013997:Time Factors; D000072216:Zona Pellucida Glycoproteins
chemical_list: D000906:Antibodies; D004527:Egg Proteins; D008562:Membrane Glycoproteins; D011956:Receptors, Cell Surface; D011994:Recombinant Proteins; D000072216:Zona Pellucida Glycoproteins; D011374:Progesterone