Miltefosine resistant field isolate from Indian Kala-azar patient shows similar phenotype in experimental infection

Khanra, S. , Sarraf, N. R., Das, A. K., Roy, S. and Manna, M. (2017) Miltefosine resistant field isolate from Indian Kala-azar patient shows similar phenotype in experimental infection. Scientific Reports, 7(1), 10330. (doi: 10.1038/s41598-017-09720-1) (PMID:28871097) (PMCID:PMC5583325)

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Emergence of resistance to drugs used to treat the Indian Kala-azar patients makes control strategy shattered. In this bleak situation, Miltefosine (MIL) was introduced to treat mainly antimonial unresponsive cases. Within years, resistance to MIL has been reported. While checking the MIL sensitivity of the recent KA clinical isolates (n = 26), we came across one isolate which showed four times more EC50 for MIL than that of MIL-Sensitive (MIL-S) isolates and considered as putative MIL-Resistant (MIL-R). The expressions of LdMT and LdRos3 genes of this isolate were found down regulated. Th1/Th2 cytokines, ROS and NO, FACS dot plots and mitochondrial trans membrane potential measurement were performed. In vivo hamster model with this MIL-R isolate showed much lesser reduction in liver weight (17.5%) compared to average reduction in liver weight (40.2%) of the animals infected with MIL-S isolates. The splenic and hepatic stamps smears of MIL-R infected hamsters revealed the retention of parasite load of about 51.45%. The splenocytes of these animals failed to proliferate anti leishmanial T-cells and lack of cell mediated immunity hampered recovery. Thus, these phenotypic expressions of experimental model may be considered similar to that of the MIL unresponsive patients. This is first such kind of report.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Khanra, Dr Supriya
Authors: Khanra, S., Sarraf, N. R., Das, A. K., Roy, S., and Manna, M.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:Scientific Reports
Publisher:Nature Research
ISSN (Online):2045-2322
Copyright Holders:Copyright © 2017 The Author(s)
First Published:First published in Scientific Reports 7(1):10330
Publisher Policy:Reproduced under a Creative Commons licence

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