Evidence map›Paper›PMID 27382018›Full record

ArticleInfection and immunity2016

The Chlamydia-Secreted Protease CPAF Promotes Chlamydial Survival in the Mouse Lower Genital Tract.

Zhangsheng Yang, Lingli Tang, Lili Shao, Yuyang Zhang, Tianyuan Zhang, Robert Schenken, Raphael Valdivia, Guangming Zhong

Abstract read
In one paragraph

Article in Infection and immunity, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed.

  1. Plasmid-encoded Pgp3 protein enhances the infectivity ofZhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences · 2026
    Article
  2. Article
  3. Article
  4. Pathogenic and Protective Roles of Neutrophils inPathogens (Basel, Switzerland) · 2025
    Review
  5. Review
  6. Article
  7. Review
  8. Article
  9. Article
  10. The multiple functions of the numerousMicrobial cell (Graz, Austria) · 2019
    Review
  11. Article
  12. Article
  13. Review
  14. Article
  15. Review
  16. Update on Chlamydia trachomatis Vaccinology.Clinical and vaccine immunology : CVI · 2017
    Review
  17. Chlamydial Plasmid-Dependent Pathogenicity.Trends in microbiology · 2017
    Review
  18. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Zhangsheng YangDepartment of Microbiology & Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.
Lingli TangDepartment of Clinic Diagnosis, Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
Lili ShaoDepartment of Microbiology & Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.
Yuyang ZhangDepartment of Microbiology & Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.
Tianyuan ZhangDepartment of Microbiology & Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.
Robert SchenkenDepartment of Obstetrics and Gynecology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.
Raphael ValdiviaDuke Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA.
Guangming ZhongDepartment of Microbiology & Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA Zhongg@uthscsa.edu.

Funding

MECHANISMS OF CHLAMYDIAL EVASION OF IMMUNE RECOGNATIONR01AI047997 · NIAID · UNIVERSITY OF TEXAS HLTH SCIENCE CENTER · PI ZHONG, GUANGMING · 2000 to 2021
$6.9M
Chlamydia trachomatis proteomicsR01AI064537 · NIAID · UNIVERSITY OF TEXAS HLTH SCIENCE CENTER · PI ZHONG, GUANGMING · 2005 to 2015
$3.5M
NIAID NIH HHS R01 AI047997NIAID NIH HHS R01 AI064537
6 · The paper itself

Abstract

Despite the extensive in vitro characterization of CPAF (chlamydial protease/proteasome-like activity factor), its role in chlamydial infection and pathogenesis remains unclear. We now report that a Chlamydia trachomatis strain deficient in expression of CPAF (L2-17) is no longer able to establish a successful infection in the mouse lower genital tract following an intravaginal inoculation. The L2-17 organisms were cleared from the mouse lower genital tract within a few days, while a CPAF-sufficient C. trachomatis strain (L2-5) survived in the lower genital tract for more than 3 weeks. However, both the L2-17 and L2-5 organisms maintained robust infection courses that lasted up to 4 weeks when they were directly delivered into the mouse upper genital tract. The CPAF-dependent chlamydial survival in the lower genital tract was confirmed in multiple strains of mice. Thus, we have demonstrated a critical role of CPAF in promoting C. trachomatis survival in the mouse lower genital tracts. It will be interesting to further investigate the mechanisms of the CPAF-dependent chlamydial pathogenicity.

Indexed as

AnimalsCell Line, TumorChlamydia InfectionsChlamydia trachomatisEndopeptidasesFemaleGenitaliaHeLa CellsHumansMiceMice, Inbred BALB CMice, Inbred C3HMice, Inbred C57BLProteasome Endopeptidase ComplexCPA factorEndopeptidasesProteasome Endopeptidase Complex

Identifiers

PMID27382018
PMCPMC4995919

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.