PPARβ/δ Augments IL-1β-Induced COX-2 Expression and PGE2 Biosynthesis in Human Mesangial Cells via the Activation of SIRT1.

PPARβ/δ Augments IL-1β-Induced COX-2 Expression and PGE2 Biosynthesis in Human Mesangial Cells via the Activation of SIRT1.
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DOI:
10.3390/metabo12070595
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发表时间:
2022-06-27
期刊:
影响因子:
4.1
通讯作者:
--
中科院分区:
生物学3区
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过氧化物酶体增殖物激活受体β/δ(过氧化物酶体增殖物激活受体β/δ)是一种配体激活的核受体,调节脂质和葡萄糖代谢以及炎症。PPARβ/δ可以通过抑制促炎细胞因子的产生来发挥抗炎作用。环氧合酶-2(考克斯-2)触发的炎症在包括肾小球肾炎在内的许多炎症性疾病的发展中起着至关重要的作用。然而,PPARβ/δ对肾脏中考克斯-2表达的影响尚未完全阐明。目前的研究表明,人肾小球系膜细胞(hMCs)中有PPARβ/δ的功能性表达,白细胞介素-1 β(IL-1β)处理可增加其表达,同时增加考克斯-2的表达和前列腺素E2(PGE 2)的生物合成。用GW 0742(一种选择性的PPARβ/δ激动剂)或通过腺病毒介导的方法过表达PPARβ/δ处理hMC显著增加了考克斯-2表达和PGE 2产生。PPARβ/δ可进一步增强IL-1β诱导的hMCs考克斯-2表达和PGE 2产生。此外,激活和过表达的PPARβ/δ均显著增加sirtuin 1(SIRT 1)的表达。抑制或敲低SIRT 1可显著减弱PPARβ/δ对IL-1β诱导的考克斯-2表达和PGE 2生物合成的影响。因此,PPARβ/δ可通过SIRT 1途径增强IL-1β诱导的hMCs考克斯-2表达和PGE 2产生。考虑到考克斯-2在肾小球肾炎中的重要作用,PPARβ/δ可能成为治疗肾脏炎症性疾病的新靶点。
Peroxisome proliferator-activated receptor β/δ (PPARβ/δ), a ligand-activated nuclear receptor, regulates lipid and glucose metabolism and inflammation. PPARβ/δ can exert an anti-inflammatory effect by suppressing proinflammatory cytokine production. Cyclooxygenase-2 (COX-2)-triggered inflammation plays a crucial role in the development of many inflammatory diseases, including glomerulonephritis. However, the effect of PPARβ/δ on the expression of COX-2 in the kidney has not been fully elucidated. The present study showed that PPARβ/δ was functionally expressed in human mesangial cells (hMCs), where its expression was increased by interleukin-1β (IL-1β) treatment concomitant with enhanced COX-2 expression and prostaglandin E2 (PGE2) biosynthesis. The treatment of hMCs with GW0742, a selective agonist of PPARβ/δ, or the overexpression of PPARβ/δ via an adenovirus-mediated approach significantly increased COX-2 expression and PGE2 production. PPARβ/δ could further augment the IL-1β-induced COX-2 expression and PGE2 production in hMCs. Moreover, both PPARβ/δ activation and overexpression markedly increased sirtuin 1 (SIRT1) expression. The inhibition or knockdown of SIRT1 significantly attenuated the effects of PPARβ/δ on the IL-1β-induced expression of COX-2 and PGE2 biosynthesis. Taken together, PPARβ/δ could augment the IL-1β-induced COX-2 expression and PGE2 production in hMCs via the SIRT1 pathway. Given the critical role of COX-2 in glomerulonephritis, PPARβ/δ may represent a novel target for the treatment of renal inflammatory diseases.
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