Vol 58, No 4 (2020)
Original paper
Published online: 2020-10-29
The protective impact of Trans-Cinnamaldehyde (TCA) against the IL-1b induced inflammation in in vitro osteoarthritis model by regulating PI3K/AKT pathways
Abstract
Introduction. Osteoarthritis (OA) is a severe joint degeneration disease in elderly people described by the advanced degradation of articular cartilage, which ultimately leads to chronic pain. Trans-cinnamaldehyde (TCA) exerted its anti-inflammatory function in numerous disease syndromes; however, its role in the pathogenesis of OA remains unknown. The current research aimed to explore the potential protective impact of TCA in the progression of osteoarthritis in vitro.
Material and methods. Human knee articular chondrocytes were treated with 10 ng/ml IL-1b alone for 24 h or in a combination in a pretreatment with TCA at different concentrations (2, 5, 10 μg/mL, 24 h). The viability and cell apoptosis were determined by CCK-8 assay and flow cytometry methods. The protein levels of IL-8, PGE2, and TNF-a and the levels of phosphorylated AKT and PI3K were evaluated using ELISA assay. Moreover, RT-qPCR was used to measure the relative mRNA expression of MMP-13, iNOS, COX-2, and ADAMTS-5 in IL-1b-induced chondrocytes.
Results. Our results revealed that the treatment with TCA had no effect on chondrocytes’ proliferation and apoptosis. Moreover, the protein levels of IL-8, TNF-a, and PGE2 were considerably reduced in IL-1b-induced chondrocytes treated with different concentrations of TCA. Furthermore, the mRNA expression of MMP-13, iNOS, COX-2, and ADAMTS-5 and the phosphorylation of AKT and PI3K were markedly reduced in IL-1b-induced chondrocytes with the increase in the concentration of TCA.
Conclusions. Trans-cinnamaldehyde inhibited the inflammation induced by IL-1b in chondrocytes through the PI3K/AKT pathway, which suggests that TCA might serve as a potential therapeutic agent for osteoarthritis treatment.
Keywords: human articular chondrocytesIL-1bosteoarthritis modeltrans-cinnamaldehydePI3K/AKT pathwayRT-qPCRELISA
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