MiR-320a is Downregulated in Patients with Myasthenia Gravis and Modulates Inflammatory Cytokines Production by Targeting Mitogen-activated Protein Kinase 1
Myasthenia gravis (MG) are T-cell dependent antibody-mediated autoimmune disorders, microRNAs are important regulators of human autoimmune disease pathogenesis. Here, we investigated the miRNAs expression profiles in MG for the first time and found that miR-320a was significantly downregulated in MG patients compared to normal healthy people. Meanwhile, pro-inflammatory cytokins in MG patients were overexpressed. Furthermore, we identified MAPK1 as a direct target of miR-320a. Downregulation of miR-320a induced the overexpression of pro-inflammatory cytokins through promoting COX-2 expression. This process was modulated by ERK/ NF-κB pathways. Taken together, our findings suggested that miR-320a could play a role in modulation of inflammatory cytokins production.
KeywordsMyasthenia gravis miR-320a MAPK1 cytokine COX-2
Mitogen-activated protein kinase1
Glyceraldehyde 3-phosphate dehydrogenase
Peripheral blood mononuclear cell
This work was supported by Shanghai Science and Technology Commission (No. 10JC1414500) and the Shanghai Committee of Science and Technology [grant 11DZ2260600].
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