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Lamb FS, Choi H, Miller MR, Stark RJ. Vascular Inflammation and Smooth Muscle Contractility: The Role of Nox1-Derived Superoxide and LRRC8 Anion Channels. Hypertension 2024; 81:752-763. [PMID: 38174563 PMCID: PMC10954410 DOI: 10.1161/hypertensionaha.123.19434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Vascular inflammation underlies the development of hypertension, and the mechanisms by which it increases blood pressure remain the topic of intense investigation. Proinflammatory factors including glucose, salt, vasoconstrictors, cytokines, wall stress, and growth factors enhance contractility and impair relaxation of vascular smooth muscle cells. These pathways share a dependence upon redox signaling, and excessive activation promotes oxidative stress that promotes vascular aging. Vascular smooth muscle cell phenotypic switching and migration into the intima contribute to atherosclerosis, while hypercontractility increases systemic vascular resistance and vasospasm that can trigger ischemia. Here, we review factors that drive the initiation and progression of this vasculopathy in vascular smooth muscle cells. Emphasis is placed on the contribution of reactive oxygen species generated by the Nox1 NADPH oxidase which produces extracellular superoxide (O2•-). The mechanisms of O2•- signaling remain poorly defined, but recent evidence demonstrates physical association of Nox1 with leucine-rich repeat containing 8 family volume-sensitive anion channels. These may provide a pathway for influx of O2•- to the cytoplasm, creating an oxidized cytoplasmic nanodomain where redox-based signals can affect both cytoskeletal structure and vasomotor function. Understanding the mechanistic links between inflammation, O2•- and vascular smooth muscle cell contractility may facilitate targeting of anti-inflammatory therapy in hypertension.
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Affiliation(s)
- Fred S Lamb
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN
| | - Hyehun Choi
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN
| | - Michael R Miller
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN
| | - Ryan J Stark
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN
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Al Abyad D, Serfaty X, Lefrançois P, Arbault S, Baciou L, Dupré-Crochet S, Kouzayha A, Bizouarn T. Role of the phospholipid binding sites, PX of p47 phox and PB region of Rac1, in the formation of the phagocyte NADPH oxidase complex NOX2. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2023; 1865:184180. [PMID: 37245861 DOI: 10.1016/j.bbamem.2023.184180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 05/22/2023] [Accepted: 05/23/2023] [Indexed: 05/30/2023]
Abstract
In phagocytes, superoxide anion (O2-), the precursor of reactive oxygen species, is produced by the NADPH oxidase complex to kill pathogens. Phagocyte NADPH oxidase consists of the transmembrane cytochrome b558 (cyt b558) and four cytosolic components: p40phox, p47phox, p67phox, and Rac1/2. The phagocyte activation by stimuli leads to activation of signal transduction pathways. This is followed by the translocation of cytosolic components to the membrane and their association with cyt b558 to form the active enzyme. To investigate the roles of membrane-interacting domains of the cytosolic proteins in the NADPH oxidase complex assembly and activity, we used giant unilamellar phospholipid vesicles (GUV). We also used the neutrophil-like cell line PLB-985 to investigate these roles under physiological conditions. We confirmed that the isolated proteins must be activated to bind to the membrane. We showed that their membrane binding was strengthened by the presence of the other cytosolic partners, with a key role for p47phox. We also used a fused chimera consisting of p47phox(aa 1-286), p67phox(aa 1-212) and Rac1Q61L, as well as mutated versions in the p47phox PX domain and the Rac polybasic region (PB). We showed that these two domains have a crucial role in the trimera membrane-binding and in the trimera assembly to cyt b558. They also have an impact on O2.- production in vitro and in cellulo: the PX domain strongly binding to GUV made of a mix of polar lipids; and the PB region strongly binding to the plasma membrane of neutrophils and resting PLB-985 cells.
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Affiliation(s)
- Dina Al Abyad
- Université Paris Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405 Orsay Cedex, France; Laboratory of Applied Biotechnology (LBA3B), AZM Center for Research in Biotechnology and its Applications, Doctoral School for Sciences and Technology, Lebanese University, Tripoli 1300, Lebanon
| | - Xavier Serfaty
- Université Paris Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405 Orsay Cedex, France
| | - Pauline Lefrançois
- Univ. Bordeaux, Bordeaux INP, CNRS, ISM, UMR 5255, F-33402 Talence, France
| | - Stephane Arbault
- Univ. Bordeaux, Bordeaux INP, CNRS, ISM, UMR 5255, F-33402 Talence, France; Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, F-33600 Pessac, France
| | - Laura Baciou
- Université Paris Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405 Orsay Cedex, France
| | - Sophie Dupré-Crochet
- Université Paris Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405 Orsay Cedex, France
| | - Achraf Kouzayha
- Laboratory of Applied Biotechnology (LBA3B), AZM Center for Research in Biotechnology and its Applications, Doctoral School for Sciences and Technology, Lebanese University, Tripoli 1300, Lebanon
| | - Tania Bizouarn
- Université Paris Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405 Orsay Cedex, France.
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