The primary goal of this grant is to test the anti-fertility potential of a contraceptive vaccine in female baboons. The principal ingredient in the vaccine is an antigen, termed SP-10, existing on the human and baboon sperm head in association with the acrosomal membranes and recently cloned from the human testis. The vaccine will be a fusion protein construct, containing 248 amino acids of SP-10 linked to 26 kD of glutathione transferase. The vaccine will be injected intramuscularly. Toward this primary goal, an initial aim will be the genetic engineering of the SP-10 polypeptide into the pGex expression vector and the purification by affinity chromatography of pure fusion protein to serve as the immunogen and for various assays. To insure that the exact homology between human and baboon SP-10 is understood, baboon SP-10 will be cloned and sequenced from baboon testis utilizing cDNA libraries which we will construct and screen with a human SP-10 nucleotide probe. Messenger RNA from all major baboon organs will be isolated and probed by Northern blotting with the human SP-10 probe to determine if any baboon organ other than testis expresses mRNAs for SP-10. This dat will re-inforce immunohistochemical and ELISA data already obtained which indicate SP-10 is a tissue specific antigen unlikely to elicit autoimmune reactions. Fertility trials of the vaccine will be conducted in 15 female baboons with 15 females receiving the vaccine ingredients minus the SP-10 immunogen. Following immunization, each baboon will be monitored through 9 menstrual cycles for evidence of conception and for anti-SP-10 antibody responses in serum and cervial mucus. Histopathological examination of baboon organs will be conducted at the conclusion of the study. The baboon serum antibodies to SP-10 will be employed to determine the immunodominant portions of the SP-10 molecule.
The research aims outlined in this proposal follow the direct path to development of a contraceptive vaccine with potential use in human females.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Research Project (R01)
Project #
2R01HD023789-04A1
Application #
3324059
Study Section
Reproductive Biology Study Section (REB)
Project Start
1988-02-01
Project End
1994-07-31
Budget Start
1991-08-01
Budget End
1992-07-31
Support Year
4
Fiscal Year
1991
Total Cost
Indirect Cost
Name
University of Virginia
Department
Type
Schools of Medicine
DUNS #
001910777
City
Charlottesville
State
VA
Country
United States
Zip Code
22904
Reddi, P P; Naaby-Hansen, S; Aguolnik, I et al. (1995) Complementary deoxyribonucleic acid cloning and characterization of mSP-10: the mouse homologue of human acrosomal protein SP-10. Biol Reprod 53:873-81
Reddi, P P; Castillo, J R; Klotz, K et al. (1994) Production in Escherichia coli, purification and immunogenicity of acrosomal protein SP-10, a candidate contraceptive vaccine. Gene 147:189-95
Foster, J A; Klotz, K L; Flickinger, C J et al. (1994) Human SP-10: acrosomal distribution, processing, and fate after the acrosome reaction. Biol Reprod 51:1222-31
Freemerman, A J; Wright, R M; Flickinger, C J et al. (1994) Tissue specificity of the acrosomal protein SP-10: a contraceptive vaccine candidate molecule. Biol Reprod 50:615-21
Kurth, B E; Wright, R M; Flickinger, C J et al. (1993) Stage-specific detection of mRNA for the sperm antigen SP-10 in human testes. Anat Rec 236:619-25
Wright, R M; Suri, A K; Kornreich, B et al. (1993) Cloning and characterization of the gene coding for the human acrosomal protein SP-10. Biol Reprod 49:316-25
Freemerman, A J; Wright, R M; Flickinger, C J et al. (1993) Cloning and sequencing of baboon and cynomolgus monkey intra-acrosomal protein SP-10: homology with human SP-10 and a mouse sperm antigen (MSA-63). Mol Reprod Dev 34:140-8
Shen, M; Wright, R M; Carta, G et al. (1993) Assay for recombinant and native human intraacrosomal antigen SP-10. Am J Reprod Immunol 29:231-40
Beecher, K L; Homyk, M; Lee, C G et al. (1993) Evidence that 68-kilodalton and 54-51-kilodalton polypeptides are components of the human sperm fibrous sheath. Biol Reprod 48:154-64
Homyk, M; Herr, J C (1992) Light and electron microscopic immunolocalization of sperm proteins identified by monoclonal antibodies from the World Health Organization Task Force on Sperm Antigens. J Reprod Immunol 22:237-56

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