Micrornas Expression Induces Apoptosis of Macrophages in Response to Leishmania Major (Mrho/Ir/75/Er): An In-Vitro and In-Vivo Study



Gholamrezaei M¹ ; Rouhani S¹ ; Mohebali M^{2, 3} ; Mohammadiyeganeh S^{4, 5} ; Haji Molla Hoseini M⁶ ; Haghighi A¹ ; Lasjerdi Z¹ ; Hamidi F¹ ; Kazem Sharifiyazdi M⁷ Show Affiliations
Source: Iranian Journal of Parasitology Published:2020

Abstract

Background: We aimed to investigate the effect of miR-15a mimic and inhibitor of miR-155 expression on apoptosis induction in macrophages infected with Iranian strain of Leishmania major in-vitro and in-vivo. Methods: RAW 264.7 cells were infected with L. major promastigotes (MRHO/IR/75/ER), and then were treated with miRNAs. For in-vivo experiment, BALB/c mice were inoculated with L. major promastigotes, and then they were treated with miRNAs. For evaluation of miRNA therapeutic effect, in-vitro and in-vivo studies were performed using quantitative Real-time PCR, Flow cytometry, lesion size measurement, and Limiting Dilution Assay (LDA). This study was performed in Shahid Beheshti University of Medical Sciences in 2019. Results: In-vitro results of flow cytometry showed that using miR-15a mimic, miR-155 inhibitor or both of them increased apoptosis of macrophages. In in-vivo, size of lesion increased during experiment in control groups (P<0.05) while application of both miR-155 inhibitor and miR-15a mimic inhibited the increase in the size of lesions within 6 wk of experiment (P=0.85). LDA results showed that microRNA therapy could significantly decrease parasite load in mimic or inhibitor receiving groups compared to the control group (P<0.05). Conclusion: miR-155 inhibitor and miR-15a mimic in L. major infected macrophages can induce apoptosis and reduce parasite burden. Therefore, miRNA-based therapy can be proposed as new treatment for cutaneous leishmaniasis. © 2020, Tehran University of Medical Sciences. All rights reserved.