Human Reproduction, Vol 12, 2664-2670, Copyright © 1997 by Oxford University Press
A Afzalpurkar, H Shibahara, A Hasegawa, K Koyama and SK Gupta
The following synthetic peptides were made as immunogens for development of
a zona-based contraceptive vaccine: P1, KQPFWLLQGGASRAETSVQPVLVE [amino
acids (aa) 23-45 with an additional K at the N-terminus]; P2,
FSEEKLVFSLRLMEENC (aa 164-179 with an additional C at the C-terminus and
T170 replaced by V); and P3, CSFSKSSNSWFPVEGPADICQCC (aa 300-322). The aa
are numbered on the basis of bonnet monkey ZP3 precursor protein.
Antibodies against an additional peptide P4, KGDCGTPSHSRRQPHVVSQWSRSA (aa
324-347), significantly inhibits human sperm-oocyte binding. In addition,
antibodies against cocktail of peptide-diphtheria toxoid conjugates also
significantly inhibit the binding of spermatozoa to zona pellucida in a
hemizona assay. These results will further help in the design of an
immunocontraceptive vaccine based upon synthetic peptides corresponding to
ZP3.
ARTICLES
Immunoreactivity and in-vitro effect on human sperm-egg binding of antibodies against peptides corresponding to bonnet monkey zona pellucida-3 glycoprotein
Gamete Antigen Laboratory, National Institute of Immunology, New Delhi, India.
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