Reversal Reaction (RR) in Leprosy is a sudden inflammatory episode in the chronic course of the disease due to rapid changeÂ of cellular immunological status. The aim of the study is to measure the in vitro results of Lymphocyte Stimulation Index (LSI) RRÂ leprosy derived lymphocytes after challenged with M.leprae antigens. Twenty three Borderline Leprosy with RR and 11 BorderlineLeprosy patients without RR were included in the study. Peripheral Blood Mononuclear Cells (PBMC) were separated from peripheralÂ blood of these patients using Ficol-Hypaque column and cultured in laboratory. Using the colorimetric tetrazole (MTT) method theseÂ lymphocytes were challenged with PHA, Dharmendra antigen (1/100 and 1/10 dilutions), LAM (50 and 100 nanograms). StimulationÂ Index were calculated and superanatans were collected for measuring the IFN-Î³ and IL-10 production (ELISA). All of lymphocytesfrom RR patients showed higher Stimulation Index after challenged with the five M.leprae antigens compared to lymphocytes fromÂ non RR patients (p <0.05) . IFN-Î³ and IL-10 also increased but not significant (p>0.05). It is concluded that lymphocytes of leprosyÂ patients during RR state are more sensitive to antigenic stimuli compared to non-RR leprosy patients. Further extended studies areneeded to determine the âcut offâ value of lymphocyte Stimulation Index that is useful for clinicians in the field in the prediction ofÂ RR before starting anti leprotic treatment.
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