The Role of Endosymbionts in Trichomonas Vaginalis Pathogenicity
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 700
- 主要终点
- Characterisation of T. vaginalis isolates and evaluation of the proportion of sexually transmitted agents in vaginal swabs of Austrian sex workers
研究概览
简要总结
With this project, the investigators aim to expand knowledge on the molecular epidemiology of Trichomonas vaginalis, thereby also evaluating the endosymbionts (Mycoplasma hominis and Trichomonas vaginalis virus) and their impact on T. vaginalis virulence. A key aspect of the study is the direct comparison between identical T. vaginalis isolates harbouring endosymbionts and those from which the endosymbionts have been removed or inhibited. For this purpose T. vaginalis clinical isolates collected in Outpatients' Centre for Infectious Venereal and Dermatological Diseases, Vienna from patients specimens (vaginal swabs or urine) will be tested. Mycoplasma hominis isolates already collected from patients samples will also be analyzed and compared with M. hominis, which are T. vaginalis endosymbionts.
In addition, 700 samples from female sex workers in Austria, who undergo regular medical check-ups, will be examined. The prevalence of sexually transmitted diseases (STDs) will be evaluated using DNA extracted from vaginal swabs, with a particular focus on parasite Trichomonas vaginalis and bacterium M. hominis. Of particular interest is the study of the prevalence of these organisms in a cohort of women who are at increased risk of infection with these pathogens due to their occupation. Moreover, the study will provide detailed information on possible co-infections, as data from routine screenings are available.
详细描述
For this specific project, patient samples will be cultured in Outpatients' Centre for Infectious Venereal and Dermatological Diseases, Vienna on modified Columbia agar. Specimens will be collected either with a swab, which is then smeared onto the agar plates, or as urine samples, which will be directly spread onto the agar plates. Agar plates that show growth of T. vaginalis after one week of anaerobic incubation at 37°C or M. hominis after two days of anaerobic incubation at 37°C will be set aside. Positive cultures on these agar plates will be collected and transferred to Institute for Specific Prophylaxis and Tropical Medicine (ISPTM) Medical University of Vienna. T. vaginalis and M. hominis isolates will be used for the further characterization. It is planned to remove endosymbionts from the collected T. vaginalis isolates and then test their viability, cytotoxicity, release of pro-inflammatory cytokines and nitric oxide production. M. hominis will be released from T. vaginalis using plasmocin, whereas 2'-C-methylcytidine will be used for Trichomonas vaginalis virus inhibitory assay. The lactase dehydrogenase assay (LDH) will be used to determine cytotoxicity of primary vaginal cells after contact with different T. vaginalis isolates. THP-1 cells (cells derived from leukemia monocytes) will be stimulated with different T. vaginalis isolates and proinflammatory cytokine and nitric oxide production will be evaluated. The expression profiles of putative virulence genes in M. hominis endosymbionts will be also tested. Detection of Ureaplasma spp. DNA in the DNA isolated from T. vaginalis isolates will be performed by PCR and presence confirmed by immunofluorescence and Ureaplasma-specific antibodies.
Vaginal swabs from individual sex-workers (delivered from Austrian Agency for Health and Food Safety) will be used for DNA isolation. For the detection of pathogens, we will use protocols that we have established in our previous studies. Amplified products will be sent for sequencing and compared with reference sequences from GenBank.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 18 Years 至 80 Years（Adult, Older Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Trichomonas vaginalis positive samples (vaginal swabs/urine) from Outpatients' Centre for Infectious Venereal and Dermatological Diseases
- •female sex-workers subjected to routine testing at Austrian Agency for Health and Food Safety
排除标准
- •samples negative for Trichomonas vaginalis from Outpatients' Centre for Infectious Venereal and Dermatological Diseases
结局指标
主要结局
Characterisation of T. vaginalis isolates and evaluation of the proportion of sexually transmitted agents in vaginal swabs of Austrian sex workers
时间窗: 2 years
Clinical isolates of T. vaginalis or vaginal swabs taken from sex workers will be used in the study. Researchers will not have access to any patient information. The results of the experiments conducted on samples from sex workers will be evaluated by sequencing the products obtained by PCR (with primers detecting different sexually transmitted pathogens) and comparing them with the Gene Bank data. In addition, the researchers will assess the percentage of samples positive for T. vaginalis, M. hominis, Ureaplasma spp. among a random group of samples obtained from anonymous sex workers. Clinical isolates of T. vaginalis will be tested by PCR for the presence of endosymbionts (M. hominis, T. vaginalis virus). PCR products will also be sequenced and results will be compared with those present in the Gene Bank.
次要结局
未报告次要终点
研究者
Iwona Lesiak-Markowicz
PhD
Medical University of Vienna