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The role of T regulatory cell-associated markers in monitoring tuberculosis treatment completion and failure

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Abstract

Monitoring tuberculosis (TB) treatment success is crucial for clinical decision-making. The only available tool in this regard is sputum microscopy, but it has demerits. Moreover, in case of smear negatives and extrapulmonary TB, an efficient tool is still sought for. Therefore, we evaluated T regulatory cell (Treg)-associated markers (CD25, CD39, and FoxP3) and cellular subsets in monitoring treatment success in treatment-completed groups. Expression profile of various markers and subsets were compared real time among treatment-naive pulmonary TB patients (TN-PTB), followed-up treatment-completed (TC-fu) cohort, and a not followed-up (TC-nfu) cohort. Peripheral blood mononuclear cells from various groups were incubated overnight and were stained with antibodies for specific markers and studied by flow cytometry. In both the treatment-completed groups, a decline in frequencies of CD25+ marker and CD4+CD25+, CD4+CD25+FoxP3, CD4+CD25+CD39+ Treg was observed with clearance of infection, indicating their potential in monitoring treatment success. However, in the case of treatment failure patient (Tfp), a drastic increase in frequency of CD4+CD25+FoxP3+ Treg subset was found, indicating its usefulness in predicting treatment failure. Although the investigation unveils markers useful in predicting treatment success or failure, the findings from this study needs to be validated in a larger cohort.

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Acknowledgements

Ms. Sonali Agrawal, a DST (Department of Science and Technology, Govt. of India) INSPIRE fellow, would like to acknowledge DST for providing research fellowship for pursuing research. The authors also thank Dr. Luke Elizabeth Hannah, Scientist, Department of HIV, National Institute for Research in Tuberculosis (NIRT), Chennai, for her support and help in performing Quantiferon TB Gold testing and Dr. Ponnuraja, Scientist, Department of Statistics, NIRT, Chennai, for his guidance in statistical analysis. The technical help provided by Mr. Vijay Dua (X-ray technician) and Mr. Ajay Kumar Jain (Hematology department) is kindly acknowledged. The authors are grateful to Mr. Ravi Kumar and Mr. Pushpendra Singh for their help in patient recruitment.

Funding

This study was funded by the Defence Research and Development Organization, India (DRDE-P1-2015/Task-216).

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Correspondence to M. Madhan Kumar.

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Ethical approval was obtained from Institutional Human Ethics Committee (IHEC) before initiating the study, and written informed consent from all the study subjects were received before collecting the samples. All the study participants were recruited from National JALMA institute for leprosy and other mycobacterial diseases (NJIL&OMD), Agra

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The authors declare that they have no conflict of interest.

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Agrawal, S., Parkash, O., Palaniappan, A.N. et al. The role of T regulatory cell-associated markers in monitoring tuberculosis treatment completion and failure. Immunol Res 66, 620–631 (2018). https://doi.org/10.1007/s12026-018-9022-7

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