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Relevance of immuno-contraceptive vaccines for population control. I. Hormonal immunocontraception
1Gamele Antigens Unit, National Institute of Immunology, JNU Campus, New Delhi, India.
Human chorionic gonadotropin--subunit beta (beta-hCG) has been so far most extensively studied antigen for immuno-contraceptive properties. Studies of vaccination of non-human primates has been so far controversially reported since some antisera obtained from baboons immunized with beta-hCG had shown cross-reactivity to other tissues. Despite these problems and concerns about the complete safety of this first generation vaccine, a decision has been made to proceed with a limited clinical trials with this vaccine. Results from these trials are encouraging and indicate that contraceptive antibody titers can be achieved with permissible adjuvants. Neutralization of LH and/or FSH by circulating antibodies may impede their action and interfere with the maturation of gametes. Gonadotropin releasing hormone can be also a suitable target for immunological attack.
Human chorionic gonadotropin--subunit beta (beta-hCG) has been so far most extensively studied antigen for immuno-contraceptive properties. Studies of vaccination of non-human primates has been so far controversially reported since some antisera obtained from baboons immunized with beta-hCG had shown cross-reactivity to other tissues. Despite these problems and concerns about the complete safety of this first generation vaccine, a decision has been made to proceed with a limited clinical trials with this vaccine. Results from these trials are encouraging and indicate that contraceptive antibody titers can be achieved with permissible adjuvants. Neutralization of LH and/or FSH by circulating antibodies may impede their action and interfere with the maturation of gametes. Gonadotropin releasing hormone can be also a suitable target for immunological attack.