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Molecular Mechanisms of Endothelial Dysfunction: Fourth Edition

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: 31 January 2025 | Viewed by 272

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Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland, OR 97239, USA
Interests: endothelial dysfunction; cerebrovascular disease; JAK-STAT; therapeutic ultrasound
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Special Issue Information

Dear Colleagues,

A Special Issue on the “Molecular Mechanisms of Endothelial Dysfunction” is being prepared for the journal IJMS. Endothelial cells form a monolayer lining the luminal surface of every blood vessel; however, these cells do much more than simply create a physical barrier between circulating blood and tissues. Endothelial cells are heterogeneous in nature, with characteristics depending on vessel size and organ, with highly specialized cells found in the brain and kidney. The endothelium is essential for vascular homeostasis, responding to chemical and physical stimuli in a paracrine, autocrine, and endocrine manner to maintain vasomotor and tissue homeostasis, producing a range of factors that regulate vascular tone, thrombosis, cellular adhesion, inflammation, and smooth muscle proliferation. A functional endothelium and vasculature are essential to tissue health and function.

When endothelial cells become dysfunctional, they lose their ability to maintain homeostasis and gain other properties leading to consequences for both the vessels and the organs they supply. Traditionally, endothelial dysfunction was described as an impaired ability to generate nitric oxide by the endothelium, leading to increased oxidative stress; however, additional markers are now also used depending on organ, such as barrier integrity for cerebrovascular endothelial cells. Endothelial dysfunction may occur as a consequence, as well as contribute to the pathogenesis of many diseases including atherosclerosis, hypertension, type II diabetes, small vessel disease, vascular dementia, Alzheimer’s disease, chronic kidney disease, and stroke, with emerging evidence suggesting that endothelial dysfunction also occurs in complications associated with COVID-19. Endothelial dysfunction is a complex process involving many signaling pathways, depending on organ, vessel size, and sex, among other factors.

The elucidation of molecular mechanisms involved in endothelial dysfunction is crucial for the development of efficient therapies to improve endothelial function and vascular homeostasis in disease. This Special Issue invites the submission of original research articles and reviews presenting current studies into the molecular processes in endothelial homeostasis and how perturbation of these leads to endothelial dysfunction.

Dr. Catherine Davis
Guest Editor

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Keywords

  • vascular permeability
  • atherosclerosis
  • blood–brain barrier
  • endothelial adhesion molecules
  • vasodilation
  • thrombosis

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Published Papers (1 paper)

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17 pages, 4106 KiB  
Article
Replicative Endothelial Cell Senescence May Lead to Endothelial Dysfunction by Increasing the BH2/BH4 Ratio Induced by Oxidative Stress, Reducing BH4 Availability, and Decreasing the Expression of eNOS
by Ignacio Hernandez-Navarro, Laura Botana, Javier Diez-Mata, Laura Tesoro, Beatriz Jimenez-Guirado, Claudia Gonzalez-Cucharero, Nunzio Alcharani, Jose Luis Zamorano, Marta Saura and Carlos Zaragoza
Int. J. Mol. Sci. 2024, 25(18), 9890; https://doi.org/10.3390/ijms25189890 - 13 Sep 2024
Viewed by 185
Abstract
Vascular aging is associated with the development of cardiovascular complications, in which endothelial cell senescence (ES) may play a critical role. Nitric oxide (NO) prevents human ES through inhibition of oxidative stress, and inflammatory signaling by mechanisms yet to be elucidated. Endothelial cells [...] Read more.
Vascular aging is associated with the development of cardiovascular complications, in which endothelial cell senescence (ES) may play a critical role. Nitric oxide (NO) prevents human ES through inhibition of oxidative stress, and inflammatory signaling by mechanisms yet to be elucidated. Endothelial cells undergo an irreversible growth arrest and alter their functional state after a finite number of divisions, a phenomenon called replicative senescence. We assessed the contribution of NO during replicative senescence of human aortic (HAEC) and coronary (CAEC) endothelial cells, in which accumulation of the senescence marker SA-β-Gal was quantified by β-galactosidase staining on cultured cells. We found a negative correlation in passaged cell cultures from P0 to P12, between a reduction in NO production with increased ES and the formation of reactive oxygen (ROS) and nitrogen (ONOO) species, indicative of oxidative and nitrosative stress. The effect of ES was evidenced by reduced expression of endothelial Nitric Oxide Synthase (eNOS), Interleukin Linked Kinase (ILK), and Heat shock protein 90 (Hsp90), alongside a significant increase in the BH2/BH4 ratio, inducing the uncoupling of eNOS, favoring the production of superoxide and peroxynitrite species, and fostering an inflammatory environment, as confirmed by the levels of Cyclophilin A (CypA) and its receptor Extracellular Matrix Metalloprotease Inducer (EMMPRIN). NO prevents ES by preventing the uncoupling of eNOS, in which oxidation of BH4, which plays a key role in eNOS producing NO, may play a critical role in launching the release of free radical species, triggering an aging-related inflammatory response. Full article
(This article belongs to the Special Issue Molecular Mechanisms of Endothelial Dysfunction: Fourth Edition)
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