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MicroRNAs have been implicated in the pathogenesis of rheumatoid arthritis (RA) and their syntheses are modulated by glycogen synthase kinase-3β (GSK-3β). Therefore, we hypothesised that the GSK-3β inhibitor, TDZD-8 can protect against collagen-induced arthritis (CIA)  via  downregulating miR155 and miR-24 expression. Rats were randomly allocated into four groups ( n  = 6) as follows: Control, Control + TDZD-8 (1 mg/kg), CIA, and CIA + TDZD-8. Rats were sacrificed after 6 weeks. We observed in the model group (CIA) significant ( p &lt;.05) increase in arthritis score and serum levels of RA biomarkers, which were significantly ( p  &lt; .05) inhibited by TDZD-8. TDZD-8 also significantly ( p &lt;.05) inhibited CIA-induced synovial tissue levels of miR155, miR-24, and inflammation. In addition, a significant ( p &lt;.05) modulation of biomarkers of survival (Bcl-2) and apoptosis (cleaved caspase-3) by TDZD-8 was observed. Thus, TDZD-8 protects against CIA in rats for a period of 6 weeks, which is associated with the inhibition of miR155/24 and inflammation, and apoptosis augmentation.

archives of physiology and biochemistry

Inhibition of glycogen synthase kinase-3β protects against collagen type II-induced arthritis associated with the inhibition of miR155/24 and inflammation and upregulation of apoptosis in rats