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Immunol."],"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Rapid and effective discrimination between active tuberculosis (ATB) and latent tuberculosis infection (LTBI) remains a challenge. There is an urgent need for developing practical and affordable approaches targeting this issue.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Participants with ATB and LTBI were recruited at Tongji Hospital (Qiaokou cohort) and Sino-French New City Hospital (Caidian cohort) based on positive T-SPOT results from June 2020 to January 2021. The expression of activation markers including HLA-DR, CD38, CD69, and CD25 was examined on <jats:italic>Mycobacterium tuberculosis<\/jats:italic> (MTB)-specific CD4<jats:sup>+<\/jats:sup> T cells defined by IFN-\u03b3, TNF-\u03b1, and IL-2 expression upon MTB antigen stimulation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 90 (40 ATB and 50 LTBI) and another 64 (29 ATB and 35 LTBI) subjects were recruited from the Qiaokou cohort and Caidian cohort, respectively. The expression patterns of Th1 cytokines including IFN-\u03b3, TNF-\u03b1, and IL-2 upon MTB antigen stimulation could not differentiate ATB patients from LTBI individuals well. However, both HLA-DR and CD38 on MTB-specific cells showed discriminatory value in distinguishing between ATB patients and LTBI individuals. As for developing a single candidate biomarker, HLA-DR had the advantage over CD38. Moreover, HLA-DR on TNF-\u03b1<jats:sup>+<\/jats:sup> or IL-2<jats:sup>+<\/jats:sup> cells had superiority over that on IFN-\u03b3<jats:sup>+<\/jats:sup> cells in differentiating ATB patients from LTBI individuals. Besides, HLA-DR on MTB-specific cells defined by multiple cytokine co-expression had a higher ability to discriminate patients with ATB from LTBI individuals than that of MTB-specific cells defined by one kind of cytokine expression. Specially, HLA-DR on TNF-\u03b1<jats:sup>+<\/jats:sup>IL-2<jats:sup>+<\/jats:sup> cells produced an AUC of 0.901 (95% CI, 0.833\u20130.969), with a sensitivity of 93.75% (95% CI, 79.85\u201398.27%) and specificity of 72.97% (95% CI, 57.02\u201384.60%) as a threshold of 44% was used. Furthermore, the performance of HLA-DR on TNF-\u03b1<jats:sup>+<\/jats:sup>IL-2<jats:sup>+<\/jats:sup> cells for differential diagnosis was obtained with validation cohort data: 90.91% (95% CI, 72.19\u201397.47%) sensitivity and 68.97% (95% CI, 50.77\u201382.73%) specificity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We demonstrated that HLA-DR on MTB-specific cells was a potentially useful biomarker for accurate discrimination between ATB and LTBI.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fimmu.2021.721013","type":"journal-article","created":{"date-parts":[[2021,8,26]],"date-time":"2021-08-26T05:18:40Z","timestamp":1629955120000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":20,"title":["Activation Phenotype of Mycobacterium tuberculosis-Specific CD4+ T Cells Promoting the Discrimination Between Active Tuberculosis and Latent Tuberculosis Infection"],"prefix":"10.3389","volume":"12","author":[{"given":"Ying","family":"Luo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Xue","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liyan","family":"Mao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qun","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guoxing","family":"Tang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huijuan","family":"Song","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shutao","family":"Tong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongyan","family":"Hou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renren","family":"Ouyang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziyong","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,8,26]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1900655","DOI":"10.2139\/ssrn.3289796","article-title":"The Global Prevalence of Latent Tuberculosis: A Systematic Review and Meta-Analysis","volume":"54","author":"Cohen","year":"2019","journal-title":"Eur Respir J"},{"key":"B2","doi-asserted-by":"publisher","first-page":"101925","DOI":"10.1016\/j.tube.2020.101925","article-title":"Contributing Risk Factors Towards the Prevalence of Multidrug-Resistant Tuberculosis in Malaysia: A Systematic Review","volume":"122","author":"Rajendran","year":"2020","journal-title":"Tuberculosis (Edinb)"},{"key":"B3","doi-asserted-by":"publisher","first-page":"30","DOI":"10.1016\/j.tube.2016.02.005","article-title":"Mycobacterium Tuberculosis Infection and Vaccine Development","volume":"98","author":"Tang","year":"2016","journal-title":"Tuberculosis (Edinb)"},{"key":"B4","unstructured":"Geneva, SwitzerlandWorld Health OrganizationGlobal Tuberculosis Report 20202020"},{"key":"B5","doi-asserted-by":"publisher","DOI":"10.3389\/fimmu.2020.02006","article-title":"Diagnosis for Latent Tuberculosis Infection: New Alternatives","volume":"11","author":"Carranza","year":"2020","journal-title":"Front Immunol"},{"key":"B6","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijid.2019.07.004","article-title":"Diagnosis and Management of Latent Tuberculosis Infection in Asia: Review of Current Status and Challenges","volume":"87","author":"Paton","year":"2019","journal-title":"Int J Infect Dis"},{"key":"B7","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijid.2019.02.035","article-title":"Latent TB Infection (LTBI) - 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