Heat denatured enzymatically inactive recombinant chlamydial protease-like activity factor induces robust protective immunity against genital chlamydial challenge

Bharat K.R. Chaganty, Ashlesh K. Murthy, Shankar J. Evani, Weidang Li, M. Neal Guentzel, James P. Chambers, Guangming Zhong, Bernard P. Arulanandam

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We have shown previously that vaccination with recombinant chlamydial protease-like activity factor (rCPAF) plus interleukin-12 as an adjuvant induces robust protective immunity against primary genital Chlamydia muridarum challenge in mice. Since CPAF is a protease, we compared the effects of enzymatically active and inactive (heat denatured) rCPAF to determine whether proteolytic activity is expendable for the induction of protective immunity against chlamydial challenge. Active, but not inactive, rCPAF immunization induced high levels of anti-active CPAF antibody, whereas both induced robust splenic CPAF-specific IFN-γ production. Vaccination with active or inactive rCPAF induced enhanced vaginal chlamydial clearance as early as day 6 with complete resolution of infection by day 18, compared to day 30 in mock-vaccinated and challenged animals. Importantly, significant and comparable reductions in oviduct pathology were observed in active and inactive rCPAF-vaccinated mice compared to mock-vaccinated animals. Thus, rCPAF induced anti-chlamydial immunity is largely independent of enzymatic activity and secondary or higher order protein conformation.

Original languageEnglish (US)
Pages (from-to)2323-2329
Number of pages7
JournalVaccine
Volume28
Issue number11
DOIs
StatePublished - Mar 8 2010

Keywords

  • Chlamydia trachomatis
  • Reproductive sequelae
  • Vaccines

ASJC Scopus subject areas

  • Molecular Medicine
  • Immunology and Microbiology(all)
  • veterinary(all)
  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

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