Department of Pediatrics, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District, Shenyang, 110004, Liaoning province, China.
Department of Pediatrics, Tangshan Maternal and Child Health Hospital, Tangshan, 063000, Hebei province, China.
Inflammation. 2022 Dec;45(6):2544-2558. doi: 10.1007/s10753-022-01711-3. Epub 2022 Jul 23.
The pathogenesis of IgA nephropathy (IgAN) is still unknown, but reportedly, interleukin 6 (IL-6) is involved in this process. However, its role in damaging glomerular endothelial cells is still unclear. Therefore, in this study, to clarify the mechanism of the pathogenesis of IgAN, we investigated the effect of IL-6 on the permeability of glomerular endothelial cells. A rat model of IgAN was established, and the animals divided into two groups, namely, the normal and IgAN groups. Glomerular endothelial cell injury was evaluated via electron microscopy. Furthermore, IL-6-induced changes in the permeability of human renal glomerular endothelial cells (HRGECs) were measured via trans-endothelial resistance (TEER) measurements and fluorescein isothiocyanate-dextran fluorescence. Furthermore, vascular endothelial-cadherin (VE-cadherin) was overexpressed to clarify the effect of IL-6 on HRGEC permeability, and to determine the pathway by which it acts. The classical signaling pathway was blocked by silencing IL-6R and the trans-signaling pathway was blocked by sgp30Fc. In IgAN rats, electron microscopy showed glomerular endothelial cell damage and western blotting revealed a significant increase in IL-6 expression, while VE-cadherin expression decreased significantly in the renal tissues. IL-6/IL-6R stimulation also significantly increased the permeability of HRGECs (p < 0.05). This effect was significantly reduced by VE-cadherin overexpression (p < 0.01). After IL-6R was silenced, IL-6/IL-6R still significantly reduced VE-cadherin expression and sgp30Fc blocked the trans-signaling pathway as well as the upregulation of IL-6/IL-6R-induced VE-cadherin expression. This suggests that IL-6 mainly acts via the trans-signaling pathway. IL-6 increased the permeability of HRGECs by decreasing the expression of VE-cadherin via the trans-signaling pathway.
IgA 肾病(IgAN)的发病机制尚不清楚,但据报道白细胞介素 6(IL-6)参与了这一过程。然而,其在损伤肾小球内皮细胞中的作用尚不清楚。因此,在这项研究中,为了阐明 IgAN 发病机制,我们研究了 IL-6 对肾小球内皮细胞通透性的影响。建立了 IgAN 大鼠模型,将动物分为正常组和 IgAN 组。通过电子显微镜评估肾小球内皮细胞损伤。此外,通过跨内皮电阻(TEER)测量和荧光素异硫氰酸酯-葡聚糖荧光测量来测量 IL-6 诱导的人肾肾小球内皮细胞(HRGEC)通透性变化。此外,过表达血管内皮钙黏蛋白(VE-cadherin)以阐明 IL-6 对 HRGEC 通透性的影响,并确定其作用途径。通过沉默 IL-6R 阻断经典信号通路,通过 sgp30Fc 阻断转信号通路。在 IgAN 大鼠中,电子显微镜显示肾小球内皮细胞损伤,Western blot 显示 IL-6 表达显著增加,而肾脏组织中 VE-cadherin 表达显著降低。IL-6/IL-6R 刺激也显著增加了 HRGEC 的通透性(p<0.05)。过表达 VE-cadherin 可显著降低这种作用(p<0.01)。沉默 IL-6R 后,IL-6/IL-6R 仍显著降低 VE-cadherin 表达,sgp30Fc 阻断转信号通路以及 IL-6/IL-6R 诱导的 VE-cadherin 表达上调。这表明 IL-6 主要通过转信号通路起作用。IL-6 通过转信号通路降低 VE-cadherin 的表达,增加 HRGEC 的通透性。
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