Ajmal Iqra, Farooq Muhammad Asad, Abbas Syed Qamar, Shah Jaffer, Majid Muhammad, Jiang Wenzheng
Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, China.
Department of Pharmacy, Sarhad University of Science and Technology, Peshawar, Pakistan.
Front Pharmacol. 2022 Sep 14;13:996321. doi: 10.3389/fphar.2022.996321. eCollection 2022.
Rheumatoid arthritis and osteoarthritis overlap many molecular mechanisms of cartilage destruction. Wear and tear in cartilage is chondrocyte-mediated, where chondrocytes act both as effector and target cells. In current study, role of β2-AR was studied in chondrocytes both and . High grade inflammation and disease models led to decline in anti-inflammatory β2-AR signaling and use of β2-AR agonist attenuated arthritis symptoms. Detailed analysis in chondrocytes revealed that Isoprenaline (ISO) and Salbutamol (SBT) increased cell viability and relative Bcl-2 expression, meanwhile, decreased proteins levels of TNF-α, IL-6 and IL-8 in arthritic chondrocytes when compared with control, respectively. SBT preserved physiological concentration of antioxidant enzymes (CAT, POD, SOD and GSH) in cartilage homogenates and ISO inhibited IL-1β-mediated genotoxicity in arthritic chondrocytes. Moreover, β2-AR agonist increased mitochondrial biogenesis and proteoglycan biosynthesis by upregulating the gene expression of , and , respectively. ISO and SBT inhibited extracellular matrix (ECM) degradation by downregulating the gene expression of , and and study. In mechanism, β2-AR agonists decreased β-arrestin and GRK2 pathway, and as a result mice receiving SBT did not exhibit severe disease. Hence our data suggest β2-AR agonist administered at disease onset can inhibit receptor internalization by downregulating the expression of β-arrestin and GRK2 in chondrocytes.
类风湿性关节炎和骨关节炎在软骨破坏的许多分子机制上存在重叠。软骨的磨损是由软骨细胞介导的,其中软骨细胞既是效应细胞又是靶细胞。在本研究中,对β2 -肾上腺素能受体(β2 -AR)在软骨细胞中的作用进行了研究。高度炎症和疾病模型导致抗炎性β2 -AR信号传导下降,而使用β2 -AR激动剂可减轻关节炎症状。对软骨细胞的详细分析表明,与对照组相比,异丙肾上腺素(ISO)和沙丁胺醇(SBT)可提高细胞活力和相对Bcl -2表达,同时降低关节炎软骨细胞中肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL -6)和白细胞介素-8(IL -8)的蛋白水平。SBT可维持软骨匀浆中抗氧化酶(CAT、POD、SOD和GSH)的生理浓度,ISO可抑制关节炎软骨细胞中白细胞介素-1β介导的基因毒性。此外,β2 -AR激动剂分别通过上调……、……和……、……的基因表达来增加线粒体生物合成和蛋白聚糖生物合成。ISO和SBT通过下调……、……和……以及……的基因表达来抑制细胞外基质(ECM)降解。在机制方面,β2 -AR激动剂减少β-抑制蛋白和GRK2途径,因此接受SBT的小鼠未表现出严重疾病。因此,我们的数据表明,在疾病发作时给予β2 -AR激动剂可通过下调软骨细胞中β-抑制蛋白和GRK2的表达来抑制受体内化。
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