Overexpression of Iron Super Oxide Dismutases A/B Genes Are Associated with Antimony Resistance of Leishmania tropica Clinical Isolates
Abstract
Background: Pentavalent antimonial has been a drug of choice against leishmaniasis, despite the emergence of treatment failure. Identification of resistance markers is urgently needed to design new therapeutic strategies. Iron-Superoxide dismutases (Fe-SODs) are antioxidant enzymes contributing to detoxify reactive oxygen species to prevent a cell from oxidative stress. Since antimonial compounds induce oxidative stress, in this survey, the expression of SOD genes was investigated to identify their expression pattern in clinical resistant isolates.
Methods: This cross-sectional survey was done in Mashhad City, northeast of Iran during 2014 to 2019. The RNA expression level of mitochondrial (SODA) and glycosomal (SODB) superoxide dismutase was investigated in 25 antimony responsive (n=15) and unresponsive (n=10) anthroponotic cutaneous leishmaniasis (ACL) patients. Total RNA extraction and cDNA synthesis, the qRT-PCR approach was utilized to investigate the relative RNA expression level.
Results: The transcript level of SODs was over-expressed in the most resistant isolates. Gene expression analysis demonstrated the over-expression of SODA and B by a factor of 3.8 and 4.81, respectively, in resistance isolates vs. sensitive ones.
Conclusion: Aberrant expression of SODA/B in unresponsive parasites could potentially implicate in detoxifying antimony-induced oxidative stress. Moreover, SODs might be considered as potential predictive markers of the response to antimonials in ACL patients in endemic areas.
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Issue | Vol 17 No 4 (2022) | |
Section | Original Article(s) | |
DOI | https://doi.org/10.18502/ijpa.v17i4.11273 | |
Keywords | ||
Superoxide dismutase Gene expression Antimony resistance L. tropica Polymerase chain reaction |
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