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Expanded Hemodialysis Therapy Ameliorates Uremia-Induced Systemic Microinflammation and Endothelial Dysfunction by Modulating VEGF, TNF-α and AP-1 Signaling.

ABSTRACT:

Abstract

Systemic chronic microinflammation and altered cytokine signaling, with adjunct cardiovascular disease (CVD), endothelial maladaptation and dysfunction is common in dialysis patients suffering from end-stage renal disease and associated with increased morbidity and mortality. New hemodialysis filters might offer improvements. We here studied the impact of novel improved molecular cut-off hemodialysis filters on systemic microinflammation, uremia and endothelial dysfunction. Human endothelial cells (ECs) were incubated with uremic serum obtained from patients treated with two different hemodialysis regimens in the Permeability Enhancement to Reduce Chronic Inflammation (PERCI-II) crossover clinical trial, comparing High-Flux (HF) and Medium Cut-Off (MCO) membranes, and then assessed for their vascular endothelial growth factor (VEGF) production and angiogenesis. Compared to HF membranes, dialysis with MCO membranes lead to a reduction in proinflammatory mediators and reduced endothelial VEGF production and angiogenesis. Cytokine multiplex screening identified tumor necrosis factor (TNF) superfamily members as promising targets. The influence of TNF-α and its soluble receptors (sTNF-R1 and sTNF-R2) on endothelial VEGF promoter activation, protein release, and the involved signaling pathways was analyzed, revealing that this detrimental signaling was indeed induced by TNF-α and mediated by AP-1/c-FOS signaling. In conclusion, uremic toxins, in particular TNF-signaling, promote endothelial maladaptation, VEGF expression and aberrant angiogenesis, which can be positively modulated by dialysis with novel MCO membranes.

Translational perspective and graphical abstract

Systemic microinflammation, altered cytokine signaling, cardiovascular disease, and endothelial maladaptation/dysfunction are common clinical complications in dialysis patients suffering from end-stage renal disease. We studied the impact of novel improved medium-cut-off hemodialysis filters on uremia and endothelial dysfunction. We can show that uremic toxins, especially TNF-signaling, promote endothelial maladaptation, VEGF expression and aberrant angiogenesis, which can be positively modulated by dialysis with novel improved medium-cut-off membranes.

SUBMITTER: Catar R

PROVIDER: S-EPMC8632537 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Background:Tumor necrosis factor alpha (TNF-?) enhances lymphangiogenesis in gallbladder carcinoma (GBC) via activation of nuclear factor (NF-?B)-dependent vascular endothelial growth factor-C (VEGF-C). Receptor-interacting protein 1 (RIP1) is a multifunctional protein in the TNF-? signaling pathway and is highly expressed in GBC. However, whether RIP1 participates in the signaling pathway of TNF-?-mediated VEGF-C expression that enhances lymphangiogenesis in GBC remains unclear. Methods:The RIP1 protein levels in the GBC-SD and NOZ cells upon stimulation with increasing concentrations of TNF-? as indicated was examined using Western blot. Lentiviral RIP1 shRNA and siI?B? were constructed and transduced respectively them into NOZ and GBC-SD cells, and then PcDNA3.1-RIP1 vectors was transduced into siRIP1 cell lines to reverse RIP1 expression. The protein expression of RIP1, inhibitor of NF-?B alpha (I?B?), p-I?B?, TAK1, NF-?B essential modulator were examined through immunoblotting or immunoprecipitation. Moreover, VEGF-C mRNA levels were measured by quantitative real-time polymerase chain reaction, VEGF-C protein levels were measured by immunoblotting and enzyme-linked immunosorbent assay, and VEGF-C promoter and NF-?B activities were quantified using a dual luciferase reporter assay. The association of NF-?B with the VEGF-C promoter was analysed by chromatin immunoprecipitation assay. A three-dimensional coculture method and orthotopic transplantation nude mice model were used to evaluate lymphatic tube-forming and metastasis ability in GBC cells. The expression of RIP1 protein, TNF-? protein and lymphatic vessels in human GBC tissues was examined by immunohistochemistry, and the dependence between RIP1 protein with TNF-? protein and lymphatic vessel density was analysed. Results:TNF-? dose- and time-dependently increased RIP1 protein expression in the GBC-SD and NOZ cells of GBC, and the strongest effect was observed with a concentration of 50 ng/ml. RIP1 is fundamental for TNF-?-mediated NF-?B activation in GBC cells and can regulate TNF-?-mediated VEGF-C expression at the protein and transcriptional levels through the NF-?B pathway. RIP1 can regulate TNF-?-mediated lymphatic tube formation and metastasis in GBC cells both in vitro and vivo. The average optical density of RIP1 was linearly related to that of TNF-? protein and the lymphatic vessel density in GBC tissues. Conclusion:We conclude that RIP1 regulates TNF-?-mediated lymphangiogenesis and lymph node metastasis in GBC by modulating the NF-?B-VEGF-C pathway.

Dataset Information

Expanded Hemodialysis Therapy Ameliorates Uremia-Induced Systemic Microinflammation and Endothelial Dysfunction by Modulating VEGF, TNF-α and AP-1 Signaling.

Abstract

Translational perspective and graphical abstract

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