title: Reduction of fertility in male mice immunised with pSG.SS.C3d3.YL.Bin1b recombinant vaccine.
abstract: OBJECTIVE
  To study the anti-fertility effect of a DNA vaccine using Bin1b as the target antigen in male mice.
  
  
  METHODS
  A novel recombinant eukaryotic vector containing a fusion gene sequence of mouse Bin1b in tandem with three copies of C3d fragment (C3d3) was used to construct pSG.SS.C3d3.YL.Bin1b. The correct expression of the Bin1b-C3d3 protein was confirmed in transfected HEK293 cells by indirect immunofluorescence and western blot analysis. The fertility of immunised mice was determined by a mating experiment and sperm motility test. Anti-Bin1b antibody titres in sera were examined by ELISA assays. Binding activity of C3d3 fragment of the fusion protein was verified in C3d receptor-expressing Raji cells and flow cytometric analysis.
  
  
  RESULTS
  Immunisation of pSG.SS.C3d3.YL.Bin1b recombinant DNA vaccine significantly decreased sperm motility and compromised fertility in male mice. ELISA results showed that the titres of anti-Bin1b IgG in sera of immunised mice increased markedly with the immunisation process. Further, the anti-fertility effect of pSG.SS.C3d3.YL.Bin1b was significantly better than that of pSG.SS.YL.Bin1b DNA vaccine and generated higher titres of anti-Bin1b antibody.
  
  
  CONCLUSIONS
  Our results show that recombinant DNA vaccine targeting Bin1b can markedly reduce fertility in male mice, providing an alternative approach for birth control.
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Keqin
authors.initials: K
authors.lastname: Zhang
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Feng-shuo
authors.initials: FS
authors.lastname: Jin
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Yan-feng
authors.initials: YF
authors.lastname: Li
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: a Department of Urology , Research Institute of Surgery, Daping Hospital, Third Military Medical University , Chongqing , China.
authors.forename: Zhong-yi
authors.initials: ZY
authors.lastname: Sun
mesh_terms: D000818:Animals; D000906:Antibodies / Q000097:blood; D015933:Complement C3d / Q000276:immunology / Q000378:metabolism; D005298:Fertility / Q000276:immunology*; D057809:HEK293 Cells / Q000276:immunology; D006801:Humans; D008297:Male; D051379:Mice; D013081:Sperm Motility / Q000276:immunology; D022642:Vaccines, Contraceptive / Q000276:immunology*; D023083:beta-Defensins / Q000097:blood / Q000276:immunology*
chemical_list: D000906:Antibodies; C465595:Spag11 protein, mouse; D022642:Vaccines, Contraceptive; D023083:beta-Defensins; D015933:Complement C3d
keywords: Anti-fertility; Bin1b; C3d; Recombinant vector vaccine