Journal of Medical Sciences

ORIGINAL ARTICLE
Year
: 2021  |  Volume : 41  |  Issue : 1  |  Page : 1--8

Identification of autophagy-related protein 3 in the ancient protist Trichomonas vaginalis


Chang-Huei Tsao1, Hsin-An Lin2, Hsin-Chung Lin3, Ruei-Min Chen3, Chien-Fu F Chen4, Yu-Chun Lin5, Kuo-Yang Huang7 
1 Department of Medical research, Tri-Service General Hospital; Department of Microbiology and Immunology, National Defense Medical Center, Taipei, Taiwan
2 Division of Infection, Department of Medicine, Tri-Service General Hospital, SongShan Branch, Taipei, Taiwan
3 Division of Clinical Pathology, Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
4 Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
5 Department of Pathology, Tri-Service General Hospital; Graduate Institute of Pathology and Parasitology, National Defense Medical Center, Taipei, Taiwan

Correspondence Address:
Dr. Kuo-Yang Huang
Graduate Institute of Pathology and Parasitology, National Defense Medical Center, No.161, Sec. 6, Minquan E. Road, Neihu Dist, Taipei City 114
Taiwan

Background: Autophagy has been suggested to be involved in the pathogenesis of protists. While the molecular mechanisms of autophagy are mainly studied in model organisms, functional characterization of autophagy-related (Atg) proteins is poorly understood in deep-branching protists. Trichomoniasis is the most common nonviral sexually transmitted infection caused by Trichomonas vaginalis. Bioinformatics analysis of the T. vaginalis genome reveals that the parasite possesses the genes encoding proteins of the Atg8 conjugation system. Herein, we sought to characterize whether the T. vaginalis Atg3 ortholog (TVAG_447140), a putative component of the TvAtg8 conjugation system, regulates autophagy in this parasite. Methods: The recombinant protein of T. vaginalis Atg3 ortholog (TvAtg3) (rTvAtg3) and the polyclonal antibody against rTvAtg3 were generated. The expression and localization was monitored upon autophagy induction by glucose restriction (GR) compared with glucose-rich cultivation. The role of TvAtg3 in autophagy was clarified using small interfering RNA targeting TvAtg3 gene. Results: Phylogenic analysis of Atg3 proteins from different organisms showed that T. vaginalis was not in a close evolutionary relationship with any other protozoan. The expression of TvAtg3 was upregulated in the late-stationary phase of GR culture, implying its involvement in autophagy. Immunofluorescence analysis revealed a much higher TvAtg3 fluorescent intensity located on the round and/or linear structures close to the nucleus. Silencing Tvatg3 expression suppressed GR-induced TvAtg8 expression and autophagic vacuoles formation. Conclusions: These findings suggest the potential role of TvAtg3 in T. vaginalis autophagy and enhance our understanding of the autophagy regulatory network in the deep-branching eukaryotes.


How to cite this article:
Tsao CH, Lin HA, Lin HC, Chen RM, Chen CFF, Lin YC, Huang KY. Identification of autophagy-related protein 3 in the ancient protist Trichomonas vaginalis.J Med Sci 2021;41:1-8


How to cite this URL:
Tsao CH, Lin HA, Lin HC, Chen RM, Chen CFF, Lin YC, Huang KY. Identification of autophagy-related protein 3 in the ancient protist Trichomonas vaginalis. J Med Sci [serial online] 2021 [cited 2021 Mar 1 ];41:1-8
Available from: https://www.jmedscindmc.com/article.asp?issn=1011-4564;year=2021;volume=41;issue=1;spage=1;epage=8;aulast=Tsao;type=0