Pharmacological Effects of Β-D-Mannuronic Acid (M2000) on Mir-146A, Irak1, Traf6 and Nf-Κb Gene Expression, As Target Molecules in Inflammatory Reactions Publisher Pubmed



Mortazavijahromi SS^{1, 2} ; Jamshidi MM^{1, 2} ; Farazmand A^{1, 2} ; Aghazadeh Z⁴ ; Yousefi M³ ; Mirshafiey A⁴
Source: Pharmacological Reports Published:2017

Abstract

Background Impaired expression and function of microRNAs (miRNAs) are involved in the pathogenesis of many autoimmune and inflammatory diseases. Moreover, there is a close relationship between TLRs and miRNAs and impairment in regulating their expression which can play a vital role in the immunopathogenesis of many inflammatory reactions. This research aimed to study the pharmaceutical effects of M2000 (β-D-mannuronic acid) on the expression of miR-146a and its two target molecules (IRAK1 and TRAF6), and the transcription factor NF-κB in the HEK-Blue hTLR2 cell line. Methods The cytotoxicity of M2000 was assessed by the MTT assay, and the qRT-PCR technique was employed in the presence and absence of M2000 treatment to measure gene-expression levels of miR-146a, IRAK1, TRAF6, and NF-κB. Results MTT assay indicated that M2000 (before the concentration of 500 μg/ml) had no cytotoxic effect on HEK-Blue hTLR2 cells. Our results showed that M2000 at low and high doses (5 and 25 μg/well) could significantly reduce gene expression levels of miR-146a (p < 0.01). Furthermore, it was found that this medication at two different doses could considerably decrease IRAK1 and TRAF6 gene expression (p < 0.001). Moreover, this study revealed that expression level of NF-κB also significantly declined at these two doses (p < 0.01). Conclusions This study for the first time shows that M2000 as a novel NSAID with immunosuppressive properties is able to modify TLR signaling through suppressing the adaptor molecules IRAK1 and TRAF6, the transcription factor NF-κB and miR-146a as a new therapeutic approach. © 2017 Institute of Pharmacology, Polish Academy of Sciences