Immunocontraception in mice using repeated, multi-antigen peptides: immunization with purified recombinant antigens
Version of Record online: 1 MAY 2007
Copyright © 2007 Wiley-Liss, Inc.
Molecular Reproduction and Development
Volume 75, Issue 1, pages 126–135, January 2008
How to Cite
Hardy, C. M., Beaton, S. and Hinds, L. A. (2008), Immunocontraception in mice using repeated, multi-antigen peptides: immunization with purified recombinant antigens. Mol. Reprod. Dev., 75: 126–135. doi: 10.1002/mrd.20745
- Issue online: 25 OCT 2007
- Version of Record online: 1 MAY 2007
- Manuscript Accepted: 17 FEB 2007
- Manuscript Received: 26 OCT 2006
- Australian Grains Research and Development Corporation. Grant Number: CSV16
- Australian Government's Cooperative Research Centres Program
- zona pellucida;
Two immunocontraceptive antigens (AgE and AgF) were constructed that included different combinations of highly species-specific peptides from the mouse reproductive antigens SP56, ZP3, ZP2, and ZP1 in the form of multi-antigen peptides (MAPs). Both AgE and AgF contained three tandem repeats each of ZP2 and ZP3 peptide epitopes and a single copy of a ZP1 peptide sequence all of which had previously been demonstrated to individually have immunodominant or contraceptive effects. In addition, AgF contained a single contraceptive peptide derived from SP56, the putative ZP3 receptor protein on sperm. The antigens were expressed and affinity purified as recombinant repeated multi-antigen (polyepitope) peptides using an Escherichia coli maltose binding protein (MBP) expression system. Female BALB/c mice actively immunized with these antigens in Freund's adjuvants produced variable serum antibody responses to the component peptides. Fertility rates for animals immunized with AgE (40%) and AgF (20%) were significantly reduced compared to MBP immunized mice (90%), but the reduction in fertility did not correlate with peptide-specific serum antibody levels. Ovaries from all immunized mice appeared histologically normal with no evidence of oophoritis. These results demonstrate that high levels of immunocontraception can be achieved in mice, without apparent side-effects, using species-specific immunogens that include repeated peptides from proteins involved in fertilization. Mol. Reprod. Dev. 75: 126–135, 2008. © 2007 Wiley-Liss, Inc.