440-P: Dual Long-Term Effects of Free Fatty Acid on Human Endothelial Barrier In Vitro Are Mediated by NO, Mitochondrial ROS, and Dicarbonyl Stress
| Autor: | N. Podkuychenko, Marina Vladimirovna Shestakova, Asker Y. Khapchaev, Alexander V. Vorotnikov, Maxim Skulachev, Vladimir P. Shirinsky, Tatiana Vlasik, Vadim Z. Lankin, I. S. Stafeev, Mikhail V. Samsonov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Mitochondrial ROS
medicine.medical_specialty biology Endothelium Chemistry Endocrinology Diabetes and Metabolism medicine.disease biology.organism_classification Umbilical vein Palmitic acid chemistry.chemical_compound Insulin resistance Endocrinology medicine.anatomical_structure Enos Internal medicine Internal Medicine medicine Carnitine Endothelial dysfunction medicine.drug |
| Zdroj: | Diabetes. 70 |
| ISSN: | 1939-327X 0012-1797 |
| DOI: | 10.2337/db21-440-p |
| Popis: | In diabetes-associated hyperlipidemia, free fatty acids (FFAs) are thought to induce insulin resistance and endothelial dysfunction leading to vascular injury and cardiovascular T2DM complications. However, evidence is scarce regarding the effects of FFA on vascular endothelial barrier. We used human umbilical vein endothelial cells (HUVEC) to model, in vitro, the endothelial barrier and reveal its responses to experimental hyperlipidemia induced by long-term treatment with palmitic acid in complex with albumin. Palmitate was continuously present in the growth medium at 0.8 mM to reproduce FFA levels typical for T2DM. We developed conditions to maintain the HUVEC monolayers in the presence of the high palmitate concentration for up to 2 weeks by adding exogenous carnitine to facilitate mitochondrial β-oxidation of FFA. In this model system, palmitate readily augmented the transendothelial electric resistance (TER) of HUVEC via increased NO production by endothelial NO-synthase (eNOS). Western blots showed that palmitate neither disturbed insulin signaling cascade towards eNOS nor upregulated eNOS expression. After the initial 3-4-day rise in TER, further treatment with palmitate led to barrier stabilization and attenuation as compared to FFA-free conditions. This later phase was associated with increased ROS and malondialdehyde (MDA) accumulation, both prevented by the mitochondria-targeted antioxidant SkQ1. Treatment of HUVEC with exogenous MDA impaired the TER and barrier suggesting that accumulation of MDA-modified proteins may contribute to the barrier dysfunction upon long-term experimental hyperlipidemia. Altogether, obtained evidence suggests that prolonged exposure of vascular endothelium to high levels of palmitate compromises endothelium barrier capacity and insulin-mediated eNOS regulation turning the enzyme permanently active. Disclosure M. Samsonov: None. V. P. Shirinsky: None. N. Podkuychenko: None. A. Y. Khapchaev: None. T. Vlasik: None. V. Lankin: None. M. Skulachev: Other Relationship; Self; Mitotech LLC. I. Stafeev: None. A. V. Vorotnikov: None. M. V. Shestakova: None. Funding Russian Science Foundation (19-15-00361) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|