Follicle-stimulating hormone receptor (FSHR)-derived peptide vaccine induced infertility in mice without pathological effect on reproductive organs

In a previous study it was found that priming with recombinant human follicle-stimulating hormone receptor (rhFSHR) protein (F140) and boosting with a peptide containing amino acids 32–44 from FSHR showed a specific immune response and fertility inhibition in adult male mice. However, this priming and boosting led to damage of the reproductive organs. Therefore, to eliminate this damage, the peptide prime–boost strategy was explored as a possible means of avoiding the pathological change while maintaining infertility. Immunisation with the peptide prime–boost strategy led to decreased fertility 10 weeks after vaccination, which is consistent with Balb/C mice treated with the protein prime–peptide boost regime. In contrast to the cellular swelling and spotty necrosis in spermatogonia observed in the protein-primed mice, the mice receiving peptide priming did not display pathological damage in seminiferous tubules and interstitial cells. Thus, the prime–boost immune regime with the FSHR-derived peptide potentially provides a much safer candidate for a contraceptive vaccine.

Genome organization of thePseudomonas aeruginosanarrow host range plasmid R91–5 determined by deletion and cloning analysis

SummaryBy physical and genetic analysis of deletion mutants of the narrow host range IncP-10P. aeruginosaconjugative plasmid R91–5 it has been shown that the phenotypes related to its transfer, namely the inhibition of the replication of the phage G101, entry exclusion and the fertility inhibition of the wide host range plasmid R18 map at kilobase coordinates 19·7–20·7, 18·5–19·7, 28·8–30·15 and/or 34·9–36·15, respectively. These locations have been confirmed by cloning restriction enzyme generated DNA fragments of R91–5 into a small broad host range, multicopy non-conjugative plasmid.