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BioMed Research International
Volume 2015 (2015), Article ID 484853, 7 pages
Research Article

Small Molecule Inhibitor of Type Three Secretion Suppresses Acute and Chronic Chlamydia trachomatis Infection in a Novel Urogenital Chlamydia Model

Gamaleya Institute of Epidemiology and Microbiology, Ministry of Health Russian Federation, Gamaleya Street 18, Moscow 123098, Russia

Received 1 September 2014; Accepted 11 December 2014

Academic Editor: Shigeru Kotake

Copyright © 2015 Ekaterina A. Koroleva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Previously, we reported that a compound from a group of thiohydrazides of oxamic acids, CL-55, possessed antichlamydial activity in vitro that was accompanied by a decreased translocation of the type three secretion effector, IncA, into the host cell. In this study, the antichlamydial activity of CL-55 was tested in vivo in DBA/2 mice infected with C. trachomatis serovar D. We found that intravaginal inoculation of DBA/2 mice with the clinically relevant strain, C. trachomatis serovar D, results in a course of infection and pathology similar to that observed in humans. The early stage of infection in this model was characterized by a shedding of Chlamydia in vaginal secretions followed by an ascending infection and inflammation in the upper genital tract. We found that CL-55 possessed antibacterial activity in vivo and was able to control C. trachomatis vaginal shedding, ascending infection, and inflammation in the upper genital organs in DBA/2 mice. Our data provide a proof of concept for the protective effect of the thiadiazinon, CL-55, against chlamydial infection in vivo and support the feasibility of further studies of its potential therapeutic applications.