COVID-19 promotes endothelial dysfunction and thrombogenicity: role of proinflammatory cytokines/SGLT2 prooxidant pathway.

BACKGROUND: COVID-19 is associated with an increased risk of cardiovascular complications. Although cytokines have a predominant role in endothelium damage, the precise molecular mechanisms are far from being elucidated. OBJECTIVES: The present study hypothesized that inflammation in patients with COVID-19 contributes to endothelial dysfunction through redox-sensitive SGLT2 overexpression and investigated the protective effect of SGLT2 inhibition by empagliflozin. METHODS: Human plasma samples were collected from patients with acute, subacute, and long COVID-19 (n = 100), patients with non-COVID-19 and cardiovascular risk factors (n = 50), and healthy volunteers (n = 25). Porcine coronary artery endothelial cells (ECs) were incubated with plasma (10%). Protein expression levels were determined using Western blot analyses and immunofluorescence staining, mRNA expression by quantitative reverse transcription-polymerase chain reaction, and the level of oxidative stress by dihydroethidium staining. Platelet adhesion, aggregation, and thrombin generation were determined. RESULTS: Increased plasma levels of interleukin (IL)-1ß, IL-6, tumor necrosis factor-α, monocyte chemoattractant protein-1, and soluble intercellular adhesion molecule-1 were observed in patients with COVID-19. Exposure of ECs to COVID-19 plasma with high cytokines levels induced redox-sensitive upregulation of SGLT2 expression via proinflammatory cytokines IL-1ß, IL-6, and tumor necrosis factor-α which, in turn, fueled endothelial dysfunction, senescence, NF-κB activation, inflammation, platelet adhesion and aggregation, von Willebrand factor secretion, and thrombin generation. The stimulatory effect of COVID-19 plasma was blunted by neutralizing antibodies against proinflammatory cytokines and empagliflozin. CONCLUSION: In patients with COVID-19, proinflammatory cytokines induced a redox-sensitive upregulation of SGLT2 expression in ECs, which in turn promoted endothelial injury, senescence, platelet adhesion, aggregation, and thrombin generation. SGLT2 inhibition with empagliflozin appeared as an attractive strategy to restore vascular homeostasis in COVID-19.

Characterization of auto-immune hepatitis associated with the use of anti-TNFα agents: An analysis of 389 cases in VigiBase.

Auto-immune diseases, including auto-immune hepatitis may be associated with the use of drugs, such as anti-TNF-α inhibitors. The aim of the study was to analyze the characteristics of anti-TNF-α inhibitor-associated auto-immune hepatitis (ATIAIH) in a large international pharmacovigilance database. We analyzed all ICSRs classified as "Autoimmune hepatitis" according to the Medical Dictionary for Drug Regulatory Activities term (preferred term level) in VigiBase, the World Health Organization global pharmacovigilance database of adverse drug reactions collected by national drug authorities in >130 countries (>90% of the world population). Bayesian disproportionality analysis was used to compute IC025, which is the lower end of the 95% credibility interval for the association between a suspected treatment and an adverse event. IC025 > 0 are considered statistically significant. A total of 389 ATIAIH ICSRs were identified. The median age at ATIAIH onset was 44 years and the female to male sex ratio was 3.72. Infliximab (IC025 = 2.98), adalimumab (IC025 = 0.32) and etanercept (IC025 = 0.19) yielded a statistically significant signal in disproportionality analysis. Infliximab was the most frequently involved drug (50.1%). The median treatment duration before ATIAH occurrence was 4.9 months. ATIAIH was reported as serious adverse event in 91%. Death (directly linked to AIH or not) occurred in 10 cases (2.9% of ICSRs). The most frequent reported indication for anti-TNF-α agent was rheumatoid arthritis (31.9%). This study enables the identification and a detailed study of 389 new cases of ATIAIH and confirms a significant association of ATIAIH with infliximab, adalimumab and etanercept.