Abstract
Aim
Intestinal tuberculosis (ITb) and Crohn’s disease (CD) mimic each other often leading to misdiagnosis. We evaluated the difference between ITb and CD using the extent of apoptosis in peripheral blood lymphocytes.
Methods
CD4+ cells as a percentage of the lymphocytes and viable, dead, total apoptotic, early apoptotic, and late apoptotic CD4+ cells were assessed in the peripheral blood by flow cytometry in healthy controls and patients with confirmed active ITb and CD prior to initiating therapy. Early apoptotic and total apoptotic cells were further expressed as a proportion of the percentage of CD4+ cells.
Results
The percentages of CD4+ cells (6.5 [3.0, 8.7] vs. 13.40 [10.15, 13.40]; p < 0.001), total apoptotic cells (0.13 [0.0, 0.22] vs. 0.08 [0.0, 0.21]; p = 0.045), early apoptotic (1.24 [0.55, 2.54] vs. 0.71 [0.40, 1.30]; p = 0.037), and the proportion of the latter two parameters (17.18 [5.61, 57.33] vs. 4.84 [2.71, 9.83]; p-value 0.039) and (17.18 [7.4, 67.50] vs. 5.51 [3.10, 11.03]; p-value 0.036) were significantly different between patients with ITb and CD. The best sensitivity, specificity, and positive and negative predictive values for the diagnosis of ITb were seen with the CD4+ cell percentage (82.6%, 82.4%, 86.4%, 77.8%, respectively) and the proportion of early apoptotic cells (73.9%, 70.6%, 77.3%, 66.7%, respectively).
Conclusion
CD4+ cells as a percentage of peripheral blood lymphocytes and the proportion of early apoptotic CD4+ cells show promise to diagnostic differentiation between ITb and CD.
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Acknowledgments
We thank our colleagues Shiran Shetty and Girisha Balaraju, from the Department of Gastroenterology and Hepatology, Kasturba Medical College, Manipal, Anurag Shetty, Department of Gastroenterology, Kasturba Medical College, Mangalore, for the help in identifying patients for the study. We also thank Ashma Dorothy Monteiro, Department of Statistics, Manipal University, for the help with statistical analysis.
Funding
This work was supported by grants from the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India.
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SSN, MVS, CGP, KPG, and KS declare that they have no conflict of interest.
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Nayak, S.S., Shetty, M.V., Pai, C.G. et al. Apoptosis in peripheral blood lymphocytes in intestinal tuberculosis and Crohn’s disease: Implications to diagnostic differentiation. Indian J Gastroenterol 39, 338–345 (2020). https://doi.org/10.1007/s12664-019-01011-z
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DOI: https://doi.org/10.1007/s12664-019-01011-z