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Shuvalova M, Dmitrieva A, Belousov V, Nosov G. The role of reactive oxygen species in the regulation of the blood-brain barrier. Tissue Barriers 2024:2361202. [PMID: 38808582 DOI: 10.1080/21688370.2024.2361202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 05/23/2024] [Indexed: 05/30/2024] Open
Abstract
The blood-brain barrier (BBB) regulates the exchange of metabolites and cells between the blood and brain, and maintains central nervous system homeostasis. Various factors affect BBB barrier functions, including reactive oxygen species (ROS). ROS can act as stressors, damaging biological molecules, but they also serve as secondary messengers in intracellular signaling cascades during redox signaling. The impact of ROS on the BBB has been observed in multiple sclerosis, stroke, trauma, and other neurological disorders, making blocking ROS generation a promising therapeutic strategy for BBB dysfunction. However, it is important to consider ROS generation during normal BBB functioning for signaling purposes. This review summarizes data on proteins expressed by BBB cells that can be targets of redox signaling or oxidative stress. It also provides examples of signaling molecules whose impact may cause ROS generation in the BBB, as well as discusses the most common diseases associated with BBB dysfunction and excessive ROS generation, open questions that arise in the study of this problem, and possible ways to overcome them.
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Affiliation(s)
- Margarita Shuvalova
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Moscow, Russia
- Department of metabolism and redox biology, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Anastasiia Dmitrieva
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Vsevolod Belousov
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Moscow, Russia
- Department of metabolism and redox biology, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies, Federal Medical Biological Agency, Moscow, Russia
- Life Improvement by Future Technologies (LIFT) Center, Skolkovo, Moscow, Russia
| | - Georgii Nosov
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies, Federal Medical Biological Agency, Moscow, Russia
- Life Improvement by Future Technologies (LIFT) Center, Skolkovo, Moscow, Russia
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Lopes KS, Marques AAM, Moreno KGT, dos Santos AC, Souza RIC, Lourenço ELB, Oliveira RJ, Gomes RDS, Lívero FADR, Gasparotto Junior A. Cardioprotective Effects of Solidago microglossa DC. in Nicotine-Treated Hypertensive Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2023; 2023:6611569. [PMID: 38161789 PMCID: PMC10756737 DOI: 10.1155/2023/6611569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 08/05/2023] [Accepted: 08/18/2023] [Indexed: 01/03/2024]
Abstract
Solidago microglossa DC. (Asteraceae), "arnica brasileira," is a Brazilian species popularly used to treat hypertension or renal ailments. This study investigated the cardioprotective effects of standardized S. microglossa extract (EESM) in nicotine-treated spontaneously hypertensive rats (SHRs). Moreover, the molecular mechanisms involved in the cardiovascular effects were also investigated. The acute toxicity was evaluated in female Wistar rats. Afterwards, six-month-old male spontaneously hypertensive rats received the EESM (14, 28, and 56 mg/kg), hydrochlorothiazide (25 mg/kg), and vehicle (filtered water; 0.1 mL/100 g) once daily for 28 days. All treatments were associated with 1.8 mg/kg of nicotine. At the end of the experimental period, the renal function, electrocardiographic profile, blood pressure, ventricular function, biochemical parameter, and mesenteric vascular bed reactivity were evaluated. Relative organ weights and cardiac morphometry were also investigated. Nicotine treatment in 6-month-old SHRs induced a significant reduction in renal function, with reduced urinary volume and lower renal elimination of sodium and creatinine. In addition, serum markers of the redox state and blood pressure levels remained significantly elevated, contributing to changes in vascular reactivity and left ventricular hypertrophy associated with reduced ventricular function. After 28 days of treatment, we found that the highest dose of EESM could mitigate all renal and cardiovascular changes developed by the nicotine-treated hypertensive rats. This study presented EESM as a possible cardioprotective drug that prevents cardiovascular dysfunctions in nicotine-treated hypertensive rats. Our data suggest EESM as a potential adjuvant therapy when cardioprotective effects are required.
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Affiliation(s)
- Katiana Simões Lopes
- Laboratory of Cardiovascular Pharmacology (LaFaC), Faculty of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | - Aline Aparecida Macedo Marques
- Laboratory of Cardiovascular Pharmacology (LaFaC), Faculty of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | - Karyne Garcia Tafarelo Moreno
- Laboratory of Cardiovascular Pharmacology (LaFaC), Faculty of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | - Ariany Carvalho dos Santos
- Laboratory of Cardiovascular Pharmacology (LaFaC), Faculty of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | - Roosevelt Isaías Carvalho Souza
- Laboratory of Cardiovascular Pharmacology (LaFaC), Faculty of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | | | - Rodrigo Juliano Oliveira
- Centro de Estudos em Células Tronco, Terapia Celular e Genética Toxicológica (CeTroGen), Faculdade de Medicina (FAMED), Universidade Federal de Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil
| | - Roberto da Silva Gomes
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58102, USA
| | - Francislaine Aparecida dos Reis Lívero
- Laboratory of Cardiometabolic Pharmacology, Federal University of Paraná, Curitiba, Brazil
- Laboratory of Preclinical Research of Natural Products, Paranaense University, Umuarama, Brazil
| | - Arquimedes Gasparotto Junior
- Laboratory of Cardiovascular Pharmacology (LaFaC), Faculty of Health Sciences, Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
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Hu H, Zhang G, Tian M, Guan X, Yin Y, Ding C, Yu S. Brucella abortus Rough-Type Mutant Induces Ferroptosis and More Oxidative Stress in Infected Macrophages. Pathogens 2023; 12:1189. [PMID: 37887705 PMCID: PMC10609801 DOI: 10.3390/pathogens12101189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/19/2023] [Accepted: 09/19/2023] [Indexed: 10/28/2023] Open
Abstract
Brucella is an intracellular parasitic bacterium that uses multiple strategies to evade the host's defense mechanisms. However, how Brucella manipulates the host-induced oxidative stress and relevant biological processes are still poorly understood. In this study, a comparative transcriptome assay of macrophages infected with Brucella abortus S2308 and its rough mutant RB14 was performed to investigate the differentially expressed genes which might be associated with the pathogenic mechanism of Brucella. Our results showed that numerous host pro-oxidative and antioxidative stress genes were differentially expressed in macrophages infected with B. abortus S2308 and mutant RB14 at 4, 8, 24, and 48 h post-infection. Interestingly, we found that several ferroptosis-associated genes were differentially expressed during B. abortus RB14 infection. Moreover, we found that the rough mutant RB14-induced macrophage death was associated with reduced levels of host glutathione and glutathione peroxidase 4, together with increased free iron, lipid peroxidation, and ROS, all of which are important hallmarks of ferroptosis. The ferroptosis occurring during infection with RB14 was reduced by treatment with the inhibitor ferrostatin-1. However, B. abortus S2308 infection did not induce these hallmarks of ferroptosis. Taken together, our results demonstrate that ferroptosis is involved in rough B. abortus infection. Investigating how Brucella manipulates oxidative stress and ferroptosis in its host will be helpful to clarify the pathogenicity of B. abortus.
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Affiliation(s)
- Hai Hu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
| | - Guangdong Zhang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
| | - Mingxing Tian
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
| | - Xiang Guan
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
| | - Yi Yin
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
| | - Chan Ding
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
| | - Shengqing Yu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; (H.H.); (G.Z.); (M.T.); (X.G.); (Y.Y.)
- Veterinary Bio-Pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China
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Cheng CK, Ding H, Jiang M, Yin H, Gollasch M, Huang Y. Perivascular adipose tissue: Fine-tuner of vascular redox status and inflammation. Redox Biol 2023; 62:102683. [PMID: 36958248 PMCID: PMC10038789 DOI: 10.1016/j.redox.2023.102683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/14/2023] [Accepted: 03/17/2023] [Indexed: 03/22/2023] Open
Abstract
Perivascular adipose tissue (PVAT) refers to the aggregate of adipose tissue surrounding the vasculature, exhibiting the phenotypes of white, beige and brown adipocytes. PVAT has emerged as an active modulator of vascular homeostasis and pathogenesis of cardiovascular diseases in addition to its structural role to provide mechanical support to blood vessels. More specifically, PVAT is closely involved in the regulation of reactive oxygen species (ROS) homeostasis and inflammation along the vascular tree, through the tight interaction between PVAT and cellular components of the vascular wall. Furthermore, the phenotype-genotype of PVAT at different regions of vasculature varies corresponding to different cardiovascular risks. During ageing and obesity, the cellular proportions and signaling pathways of PVAT vary in favor of cardiovascular pathogenesis by promoting ROS generation and inflammation. Physiological means and drugs that alter PVAT mass, components and signaling may provide new therapeutic insights in the treatment of cardiovascular diseases. In this review, we aim to provide an updated understanding towards PVAT in the context of redox regulation, and to highlight the therapeutic potential of targeting PVAT against cardiovascular complications.
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Affiliation(s)
- Chak Kwong Cheng
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China.
| | - Huanyu Ding
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Minchun Jiang
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Huiyong Yin
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China
| | - Maik Gollasch
- Department of Internal Medicine and Geriatrics, University Medicine Greifswald, Felix-Hausdorff-Straße 3, 17487, Greifswald, Germany
| | - Yu Huang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China.
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Kadife E, Hannan N, Harper A, Binder N, Beard S, Brownfoot FC. Hydroxychloroquine reduces soluble Flt-1 secretion from human cytotrophoblast, but does not mitigate markers of endothelial dysfunction in vitro. PLoS One 2022; 17:e0271560. [PMID: 36417467 PMCID: PMC9683551 DOI: 10.1371/journal.pone.0271560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 07/04/2022] [Indexed: 11/26/2022] Open
Abstract
Preeclampsia is a multi-system disease that can have severe, even fatal implications for the mother and fetus. Abnormal placentation can lead to ischaemic tissue injury and placental inflammation. In turn, the placenta releases anti-angiogenic factors into the maternal circulation. These systemically act to neutralise angiogenic factors causing endothelial dysfunction causing preeclampsia. Hydroxychloroquine is an immune modulating drug that is considered safe in pregnancy. There is epidemiological evidence suggesting it may reduce the risk of preeclampsia. Here, we examined the effects hydroxychloroquine on the production and secretion of sFlt-1, soluble endoglin (sENG), placental growth factor (PlGF) and vascular endothelial growth factor (VEGF) in primary human placenta, cytotrophoblasts and umbilical vein endothelial cells (endothelial cell model). Hydroxychloroquine treatment decreased mRNA expression of two sFlt-1 isoforms and its protein secretion. sENG was not reduced. Hydroxychloroquine treatment increased secretion of pro-angiogenic factor PIGF from endothelial cells. It did not significantly reduce the expression of the endothelial cell inflammation marker, ET-1, and inflammation induced expression of the adhesion molecule, VCAM. Hydroxychloroquine could not overcome leukocyte adhesion to endothelial cells. Hydroxychloroquine mitigates features of preeclampsia, but it does not reduce key markers of endothelial dysfunction.
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Affiliation(s)
- Elif Kadife
- Department of Obstetrics and Gynaecology, Obstetric Diagnostics and Therapeutics Group, University of Melbourne, Melbourne, Victoria, Australia
- Mercy Perinatal, Mercy Hospital for Women, Melbourne, Victoria, Australia
| | - Natalie Hannan
- Mercy Perinatal, Mercy Hospital for Women, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Therapeutics Discovery and Vascular Function in Pregnancy, University of Melbourne, Melbourne, Victoria, Australia
| | - Alesia Harper
- Department of Obstetrics and Gynaecology, Obstetric Diagnostics and Therapeutics Group, University of Melbourne, Melbourne, Victoria, Australia
- Mercy Perinatal, Mercy Hospital for Women, Melbourne, Victoria, Australia
| | - Natalie Binder
- Mercy Perinatal, Mercy Hospital for Women, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Therapeutics Discovery and Vascular Function in Pregnancy, University of Melbourne, Melbourne, Victoria, Australia
| | - Sally Beard
- Mercy Perinatal, Mercy Hospital for Women, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Therapeutics Discovery and Vascular Function in Pregnancy, University of Melbourne, Melbourne, Victoria, Australia
| | - Fiona C. Brownfoot
- Department of Obstetrics and Gynaecology, Obstetric Diagnostics and Therapeutics Group, University of Melbourne, Melbourne, Victoria, Australia
- Mercy Perinatal, Mercy Hospital for Women, Melbourne, Victoria, Australia
- * E-mail:
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Lopes PDD, de Assis N, de Araújo NF, Moreno OLM, Jorge KTDOS, E Castor MGM, Teixeira MM, Soriani FM, Capettini LDSA, Bonaventura D, Cau SBDA. COX/iNOS dependence for angiotensin-II-induced endothelial dysfunction. Peptides 2022; 157:170863. [PMID: 36028074 DOI: 10.1016/j.peptides.2022.170863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 08/19/2022] [Accepted: 08/20/2022] [Indexed: 10/31/2022]
Abstract
Vascular dysfunction induced by angiotensin-II can result from direct effects on vascular and inflammatory cells and indirect hemodynamic effects. Using isolated and functional cultured aortas, we aimed to identify the effects of angiotensin-II on cyclooxygenase (COX) and inducible nitric oxide synthase (iNOS) and evaluate their impact on vascular reactivity. Aortic rings from mice were incubated overnight in culture medium containing angiotensin-II (100 nmol/L) or vehicle to induce vascular disfunction. Vascular reactivity of cultured arteries was evaluated in a bath chamber. Immunofluorescence staining for COX-1 and COX-2 was performed. Nitric oxide (NO) formation was approached by the levels of nitrite, a NO end product, and using a fluorescent probe (DAF). Oxidative and nitrosative stress were determined by DHE fluorescence and nitrotyrosine staining, respectively. Arteries cultured with angiotensin-II showed impairment of endothelium-dependent relaxation, which was reversed by the AT1 receptor antagonist. Inhibition of COX and iNOS restored vascular relaxation, suggesting a common pathway in which angiotensin-II triggers COX and iNOS, leading to vasoconstrictor receptors activation. Moreover, using selective antagonists, TP and EP were identified as the receptors involved in this response. Endothelium-dependent contractions of angiotensin-II-cultured aortas were blunted by ibuprofen, and increased COX-2 immunostaining was found in the arteries, indicating endothelium release of vasoconstrictor prostanoids. Angiotensin-II induced increased reactive oxygen species and NO production. An iNOS inhibitor prevented NO enhancement and nitrotyrosine accumulation in arteries stimulated with angiotensin-II. These results confirm that angiotensin-II causes vascular inflammation that culminates in endothelial dysfunction in an iNOS and COX codependent manner.
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Affiliation(s)
- Patrícia das Dores Lopes
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | - Naiara de Assis
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | - Natália Ferreira de Araújo
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | - Olga Lúcia Maquilon Moreno
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | | | | | - Mauro Martins Teixeira
- Department of Biochemistry & Immunology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | - Frederico Marianetti Soriani
- Department of Genetics, Ecology & Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | | | - Daniella Bonaventura
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil
| | - Stefany Bruno de Assis Cau
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, MG, Brazil.
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Zhou Y, Suo W, Zhang X, Lv J, Liu Z, Liu R. Roles and mechanisms of quercetin on cardiac arrhythmia: A review. Biomed Pharmacother 2022; 153:113447. [DOI: 10.1016/j.biopha.2022.113447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 07/14/2022] [Accepted: 07/18/2022] [Indexed: 11/02/2022] Open
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Wang D, Wang C, Hao X, Carter G, Carter R, Welch WJ, Wilcox CS. Activation of Nrf2 in Mice Causes Early Microvascular Cyclooxygenase-Dependent Oxidative Stress and Enhanced Contractility. Antioxidants (Basel) 2022; 11:antiox11050845. [PMID: 35624708 PMCID: PMC9137799 DOI: 10.3390/antiox11050845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/15/2022] [Accepted: 04/19/2022] [Indexed: 12/05/2022] Open
Abstract
Nuclear factor erythroid factor E2-related factor 2 (Nrf2) transcribes antioxidant genes that reduce the blood pressure (BP), yet its activation with tert-butylhydroquinone (tBHQ) in mice infused with angiotensin II (Ang II) increased mean arterial pressure (MAP) over the first 4 days of the infusion. Since tBHQ enhanced cyclooxygenase (COX) 2 expression in vascular smooth muscle cells (VSMCs), we tested the hypothesis that tBHQ administration during an ongoing Ang II infusion causes an early increase in microvascular COX-dependent reactive oxygen species (ROS) and contractility. Mesenteric microarteriolar contractility was assessed on a myograph, and ROS by RatioMaster™. Three days of oral tBHQ administration during the infusion of Ang II increased the mesenteric microarteriolar mRNA for p47phox, the endothelin type A receptor and thromboxane A2 synthase, and increased the excretion of 8-isoprostane F2α and the microarteriolar ROS and contractions to a thromboxane A2 (TxA2) agonist (U-46,619) and endothelin 1 (ET1). These were all prevented in Nrf2 knockout mice. Moreover, the increases in ROS and contractility were prevented in COX1 knockout mice with blockade of COX2 and by blockade of thromboxane prostanoid receptors (TPRs). In conclusion, the activation of Nrf2 over 3 days of Ang II infusion enhances microarteriolar ROS and contractility, which are dependent on COX1, COX2 and TPRs. Therefore, the blockade of these pathways may diminish the early adverse cardiovascular disease events that have been recorded during the initiation of Nrf2 therapy.
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Affiliation(s)
- Dan Wang
- Division of Nephrology and Hypertension and Hypertension Center, Georgetown University, Washington, DC 20007, USA
| | - Cheng Wang
- Division of Nephrology, Department of Medicine, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - Xueqin Hao
- Department of Human Anatomy and Histoembryology, School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang 471023, China
| | - Gabriela Carter
- Division of Nephrology and Hypertension and Hypertension Center, Georgetown University, Washington, DC 20007, USA
| | - Rafaela Carter
- Division of Nephrology and Hypertension and Hypertension Center, Georgetown University, Washington, DC 20007, USA
| | - William J Welch
- Division of Nephrology and Hypertension and Hypertension Center, Georgetown University, Washington, DC 20007, USA
| | - Christopher S Wilcox
- Division of Nephrology and Hypertension and Hypertension Center, Georgetown University, Washington, DC 20007, USA
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Differential effects of cyclo-oxygenase 1 and 2 inhibition on angiogenesis inhibitor-induced hypertension and kidney damage. Clin Sci (Lond) 2022; 136:675-694. [PMID: 35441670 PMCID: PMC9093150 DOI: 10.1042/cs20220182] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/15/2022] [Accepted: 04/20/2022] [Indexed: 11/17/2022]
Abstract
Vascular endothelial growth factor antagonism with angiogenesis inhibitors in cancer patients induces a ‘preeclampsia-like’ syndrome including hypertension, proteinuria and elevated endothelin (ET)-1. Cyclo-oxygenase (COX) inhibition with aspirin is known to prevent the onset of preeclampsia in high-risk patients. In the present study, we hypothesised that treatment with aspirin would prevent the development of angiogenesis inhibitor-induced hypertension and kidney damage. Our aims were to compare the effects of low-dose (COX-1 inhibition) and high-dose (dual COX-1 and COX-2 inhibition) aspirin on blood pressure, vascular function, oxidative stress, ET-1 and prostanoid levels and kidney damage during angiogenesis-inhibitor therapy in rodents. To this end, Wistar Kyoto rats were treated with vehicle, angiogenesis inhibitor (sunitinib) alone or in combination with low- or high-dose aspirin for 8 days (n=5–7/group). Our results demonstrated that prostacyclin (PGI2) and ET-1 were increased during angiogenesis-inhibitor therapy, while thromboxane (TXA2) was unchanged. Both low- and high-dose aspirin blunted angiogenesis inhibitor-induced hypertension and vascular superoxide production to a similar extent, whereas only high-dose aspirin prevented albuminuria. While circulating TXA2 and prostaglandin F2α levels were reduced by both low- and high-dose aspirin, circulating and urinary levels PGI2 were only reduced by high-dose aspirin. Lastly, treatment with aspirin did not significantly affect ET-1 or vascular function. Collectively our findings suggest that prostanoids contribute to the development of angiogenesis inhibitor-induced hypertension and renal damage and that targeting the prostanoid pathway could be an effective strategy to mitigate the unwanted cardiovascular and renal toxicities associated with angiogenesis inhibitors.
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The effect of continuous Jue tone intervention on blood pressure and vasoactive substances in hypertensive rats with a liver-fire hyperactivity pattern. JOURNAL OF TRADITIONAL CHINESE MEDICAL SCIENCES 2021. [DOI: 10.1016/j.jtcms.2021.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Prasad A, Mahmood A, Gupta R, Bisoyi P, Saleem N, Naga Prasad SV, Goswami SK. In cardiac muscle cells, both adrenergic agonists and antagonists induce reactive oxygen species from NOX2 but mutually attenuate each other's effects. Eur J Pharmacol 2021; 908:174350. [PMID: 34265295 DOI: 10.1016/j.ejphar.2021.174350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/07/2021] [Accepted: 07/12/2021] [Indexed: 11/25/2022]
Abstract
In cardiac muscle cells adrenergic agonists stimulate the generation of reactive oxygen species, followed by redox signaling. We postulated that the antagonists would attenuate such reactive oxygen species generation by the agonists. H9c2 cardiac myoblasts, neonatal rat cardiac myocytes, and HEK293 cells expressing β1/β2 adrenoceptors were stimulated with several agonists and antagonists. All the agonists and antagonists independently generated reactive oxygen species; but its generation was minimum whenever an agonists was added together with an antagonist. We monitored the Ca++ signaling in the treated cells and obtained similar results. In all treatment sets, superoxide and H2O2 were generated in the mitochondria and the cytosol respectively. NOX2 inhibitor gp91ds-tat blocked reactive oxygen species generation by both the agonists and the antagonists. The level of p47phox subunit of NOX2 rapidly increased upon treatment, and it translocated to the plasma membrane, confirming NOX2 activation. Inhibitor studies showed that the activation of NOX2 involves ERK, PI3K, and tyrosine kinases. Recombinant promoter-reporter assays showed that reactive oxygen species generated by both the agonists and antagonists modulated downstream gene expression. Mice injected with the β-adrenergic agonist isoproterenol and fed with the antagonist metoprolol showed a robust induction of p47phox in the heart. We conclude that both the agonism and antagonism of adrenoceptors initiate redox signaling but when added together, they mutually counteract each other's effects. Our study thus highlights the importance of reactive oxygen species in adrenoceptor agonism and antagonism with relevance to the therapeutic use of the β blockers.
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Affiliation(s)
- Anamika Prasad
- School of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi, 110067, India
| | - Amena Mahmood
- School of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi, 110067, India; DDU-Kaushal Kendra, Centre for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Richa Gupta
- School of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi, 110067, India
| | - Padmini Bisoyi
- School of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi, 110067, India
| | - Nikhat Saleem
- School of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi, 110067, India
| | - Sathyamangla V Naga Prasad
- NB50, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH, 44195, USA.
| | - Shyamal K Goswami
- School of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi, 110067, India.
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Protective Effects of Estrogen on Cardiovascular Disease Mediated by Oxidative Stress. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:5523516. [PMID: 34257804 PMCID: PMC8260319 DOI: 10.1155/2021/5523516] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/16/2021] [Accepted: 05/22/2021] [Indexed: 02/07/2023]
Abstract
Perimenopause is an important stage of female senescence. Epidemiological investigation has shown that the incidence of cardiovascular disease in premenopausal women is lower than that in men, and the incidence of cardiovascular disease in postmenopausal women is significantly higher than that in men. This phenomenon reveals that estrogen has a definite protective effect on the cardiovascular system. In the cardiovascular system, oxidative stress is considered important in the pathogenesis of atherosclerosis, myocardial dysfunction, cardiac hypertrophy, heart failure, and myocardial ischemia. From the perspective of oxidative stress, estrogen plays a regulatory role in the cardiovascular system through the estrogen receptor, providing strategies for the treatment of menopausal women with cardiovascular diseases.
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Bruno AS, Lopes PDD, de Oliveira KCM, de Oliveira AK, de Assis Cau SB. Vascular Inflammation in Hypertension: Targeting Lipid Mediators Unbalance and Nitrosative Stress. Curr Hypertens Rev 2021; 17:35-46. [PMID: 31858899 DOI: 10.2174/1573402116666191220122332] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/24/2019] [Accepted: 11/28/2019] [Indexed: 11/22/2022]
Abstract
Arterial hypertension is a worldwide public health threat. High Blood Pressure (BP) is commonly associated with endothelial dysfunction, nitric oxide synthases (NOS) unbalance and high peripheral vascular resistance. In addition to those, inflammation has also been designated as one of the major components of BP increase and organ damage in hypertension. This minireview discusses vascular inflammatory triggers of high BP and aims to fill the existing gaps of antiinflammatory therapy of hypertension. Among the reasons discussed, enhanced prostaglandins rather than resolvins lipid mediators, immune cell infiltration and oxidative/nitrosative stress are pivotal players of BP increase within the inflammatory hypothesis. To address these inflammatory targets, this review also proposes new concepts in hypertension treatment with non-steroidal antiinflammatory drugs (NSAIDs), nitric oxide-releasing NSAIDs (NO-NSAIDs) and specialized proresolving mediators (SPM). In this context, the failure of NSAIDs in hypertension treatment seems to be associated with the reduction of endogenous NO bioavailability, which is not necessarily an effect of all drug members of this pharmacological class. For this reason, NO-releasing NSAIDs seem to be safer and more specific therapy to treat vascular inflammation in hypertension than regular NSAIDs.
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Affiliation(s)
- Alexandre S Bruno
- Department of Pharmacology, Institute of Biological Science, Federal University of Minas Gerais, MG, Brazil
| | - Patricia das Dores Lopes
- Department of Pharmacology, Institute of Biological Science, Federal University of Minas Gerais, MG, Brazil
| | - Karla C M de Oliveira
- Department of Pharmacology, Institute of Biological Science, Federal University of Minas Gerais, MG, Brazil
| | - Anizia K de Oliveira
- Department of Pharmacology, Institute of Biological Science, Federal University of Minas Gerais, MG, Brazil
| | - Stefany B de Assis Cau
- Department of Pharmacology, Institute of Biological Science, Federal University of Minas Gerais, MG, Brazil
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14
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Tufiño C, Vanegas M, Velázquez Nevárez R, Villanueva López C, Bobadilla Lugo RA. Divergent impact of gestational diabetes mellitus between the thoracic and abdominal rat aorta: Influence of endothelium and angiotensin II receptors. Eur J Pharmacol 2021; 899:173981. [PMID: 33689706 DOI: 10.1016/j.ejphar.2021.173981] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 02/15/2021] [Accepted: 02/23/2021] [Indexed: 01/23/2023]
Abstract
Gestational diabetes mellitus (GDM) affects 5-10% of pregnancies and increases the risk of fetal and maternal adverse outcomes. Interestingly, the vascular response to AngII is decreased by pregnancy while the response is increased by diabetes. It remains unclear how GDM affects vascular tone and how angiotensin II receptors contribute to these changes. In this work, we sought to establish the vascular impact of a hypercaloric diet-induced GDM through changes in AT1 and AT2 receptor's expression. Female rats fed for 7 weeks with standard (SD) or hypercaloric (HD) diet were divided at week 4. Half of the rats of each group were mated to become pregnant and those fed with a HD developed GDM. AngII-induced vasoconstriction was measured in thoracic or abdominal aorta rings using a conventional isolated organ bath and AT1 and AT2 receptors were searched by immunohistochemistry. Experiments where conducted on the pregnant standard diet group (PSD) and the pregnant hypercaloric-gestational diabetes mellitus group (PHD-GDM). Vasoconstriction was reduced in the thoracic aorta (P < 0.05 vs PSD) but increased in the abdominal aorta of PHD-GDM rats (P < 0.05 vs PSD). Blockade of AT2 receptors using PD123319 decreased vasoconstriction, particularly in the abdominal aorta of PHD-GDM animals (P < 0.05 vs PSD). PHD-GDM increased AT1 receptors expression (P < 0.05 vs PSD). Also, PHD-GDM reverted physiologic hypoglycemia and hypotension of healthy pregnancy. Findings provide new insight into the hypercaloric diet induced damage on the vasculature during pregnancy.
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MESH Headings
- Angiotensin II/pharmacology
- Angiotensin Receptor Antagonists/pharmacology
- Animals
- Aorta, Abdominal/drug effects
- Aorta, Abdominal/metabolism
- Aorta, Abdominal/physiopathology
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Aorta, Thoracic/physiopathology
- Diabetes, Gestational/metabolism
- Diabetes, Gestational/physiopathology
- Disease Models, Animal
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Endothelium, Vascular/physiopathology
- Female
- Pregnancy
- Rats, Wistar
- Receptor, Angiotensin, Type 1/agonists
- Receptor, Angiotensin, Type 1/metabolism
- Receptor, Angiotensin, Type 2/agonists
- Receptor, Angiotensin, Type 2/metabolism
- Signal Transduction
- Vasoconstriction/drug effects
- Vasoconstrictor Agents/pharmacology
- Rats
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Affiliation(s)
- Cecilia Tufiño
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Santo Tomás, México, 11340, D.F, Mexico
| | - Miriam Vanegas
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Santo Tomás, México, 11340, D.F, Mexico
| | - Ruth Velázquez Nevárez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Santo Tomás, México, 11340, D.F, Mexico
| | - Cleva Villanueva López
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Santo Tomás, México, 11340, D.F, Mexico
| | - Rosa Amalia Bobadilla Lugo
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Santo Tomás, México, 11340, D.F, Mexico.
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15
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Bai J, Ma Q, Lan Y, Chen Y, Ma S, Li J, Liu C, Fu Z, Lu X, Huang Y, Li Y. Mitochondrial tRNA Mutation and Regulation of the Adiponectin Pathway in Maternally Inherited Hypertension in Chinese Han. Front Cell Dev Biol 2021; 8:623450. [PMID: 33553162 PMCID: PMC7862570 DOI: 10.3389/fcell.2020.623450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/01/2020] [Indexed: 01/11/2023] Open
Abstract
Some essential hypertension (EH) patients show maternal inheritance, which is the mode of mitochondrial DNA inheritance. This study examines the mechanisms by which mitochondrial mutations cause EH characterized by maternal inheritance. The study enrolled 115 volunteers, who were divided into maternally inherited EH (group A, n = 17), non-maternally inherited EH (group B, n = 65), and normal control (group C, n = 33) groups. A mitochondrial tRNA (15910 C>T) gene mutation was significantly correlated with EH and may play an important role in the pathogenesis of maternally inherited EH. Examining two families carrying the mitochondrial tRNA 15910 C>T mutation, which disrupted base pairing and may affect the stability and function of mitochondrial tRNAThr, we find that the overall incidence of EH was 59.3% in the maternal family members and 90% in males, significantly higher than in the general population in China (23.2%), and that the EH began at a younger age in those carrying mitochondrial tRNA 15910 C>T. To reveal the mechanism through which mitochondrial tRNA 15910 C>T causes maternally inherited EH, we cultured human peripheral blood mononuclear cells from family A2 in vitro. We find that cells carrying mitochondrial tRNA 15910 C>T were more viable and proliferative, and the increased ATP production resulted in raised intracellular reactive oxygen species (ROS). Moreover, the mitochondrial dysfunction resulted in reduced APN levels, causing hypoadiponectinemia, which promoted cell proliferation, and produced more ROS. This vicious cycle promoted the occurrence of EH with maternally inherited mitochondrial tRNA 15910 C>T. The mitochondrial tRNA 15910 C>T mutation may induce hypertension by changing the APN, AdipoR1, PGC-1α, and ERRα signaling pathways to elevate blood pressure. We discover a new mitochondrial mutation (tRNA 15910 C>T) related to EH, reveal part of the mechanism by which mitochondrial mutations lead to the occurrence and development of maternally inherited EH, and discuss the role of APN in it.
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Affiliation(s)
- Jing Bai
- Medical School of Chinese People's Liberation Army (PLA), Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Qiang Ma
- Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Yunfeng Lan
- Hainan LANBO Health Management Co. Ltd., Sanya, China
| | - Yating Chen
- Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Shanshan Ma
- Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Jiaxin Li
- Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Chuanbin Liu
- Medical School of Chinese People's Liberation Army (PLA), Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Zihao Fu
- Medical School of Chinese People's Liberation Army (PLA), Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Xu Lu
- Medical School of Chinese People's Liberation Army (PLA), Beijing, China.,Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Yun Huang
- Department of Gerontology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yang Li
- Department of Cardiology, The Sixth Medical Center, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
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Dong K, Yang N, Ding J, Yan YY, Lu L, Wang YS. RNA interference targeting NOX4 protects visual function in an experimental model of retinal detachment by alleviating blood-retinal barrier damage. Int J Ophthalmol 2021; 14:50-56. [PMID: 33469483 DOI: 10.18240/ijo.2021.01.07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 08/12/2020] [Indexed: 11/23/2022] Open
Abstract
AIM To observe the effects of the inhibition of NADPH oxidase 4 (NOX4) expression on the retinal vascular barriers and visual function after retinal detachment (RD). METHODS RD model was established 3wk after adeno-associaned virus vector injection. The retinal tissue was harvested 3d after RD, and the death of retinal vascular endothelial cells and photoreceptors was observed using electron microscopy. The NOX4 expression was detected by Western blot. Confocal microscopy was used to observe a retinal patch that had been perfused with Evans blue. A modified water maze test was used to detect the time required to find the platform on the water surface. The visual function of the rats was evaluated and reactive oxygen species (ROS) expression was detected by a fluorescence microplate reader. RESULTS The retinal patch showed that NOX4 interference significantly reduced the destruction of the tight junctions between the retinal endothelium of RD rats and reduced leakage. Western blotting showed decreased expression of the NOX4 protein and decreased expression of ROS in retinal tissue; the Morris water maze test results showed that NOX4 interference significantly decreased the escape latency of the rats. CONCLUSION NOX4 interference reduces the production of ROS in retinal vascular endothelial cells after experimental RD, thereby protecting the blood-retinal barrier and protecting visual function.
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Affiliation(s)
- Kai Dong
- Department of Ophthalmology, Anhui Provincial Hospital, Anhui Medical University, Hefei 230001, Anhui Province, China
| | - Nan Yang
- Department of Ophthalmology, Anhui Provincial Hospital, Anhui Medical University, Hefei 230001, Anhui Province, China
| | - Jie Ding
- Department of Ophthalmology, the Second People's Hospital of Hefei, Hefei 230001, Anhui Province, China
| | - Yuan-Ye Yan
- Department of Ophthalmology, Wannan Medical College, Wuhu 241001, Anhui Province, China
| | - Li Lu
- Department of Ophthalmology, Eye Center, the First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230001, Anhui Province, China
| | - Yi-Sai Wang
- Department of Ophthalmology, Anhui Provincial Hospital, Anhui Medical University, Hefei 230001, Anhui Province, China
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17
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Li L, Lai EY, Cao X, Welch WJ, Wilcox CS. Endothelial prostaglandin D 2 opposes angiotensin II contractions in mouse isolated perfused intracerebral microarterioles. J Renin Angiotensin Aldosterone Syst 2020; 21:1470320320966177. [PMID: 33094663 PMCID: PMC7585895 DOI: 10.1177/1470320320966177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Hypothesis: A lack of contraction of cerebral microarterioles to Ang II (“resilience”) depends on cyclooxygenase (COX) and lipocalin type prostaglandin D sythase L-PGDS producing PGD2 that activates prostaglandin D type 1 receptors (DP1Rs) and nitric oxide synthase (NOS). Materials & Methods: Contractions were assessed in isolated, perfused vessels and NO by fluorescence microscopy. Results: The mRNAs of penetrating intraparenchymal cerebral microarterioles versus renal afferent arterioles were >3000-fold greater for L-PGDS and DP1R and 5-fold for NOS III and COX 2. Larger cerebral arteries contracted with Ang II. However, cerebral microarterioles were entirely unresponsive but contracted with endothelin 1 and perfusion pressure. Ang II contractions were evoked in cerebral microarterioles from COX1 –/– mice or after blockade of COX2, L-PGDS or NOS and in deendothelialized vessels but effects of deendothelialization were lost during COX blockade. NO generation with Ang II depended on COX and also was increased by DP1R activation. Conclusion: The resilience of cerebral arterioles to Ang II contractions is specific for intraparenchymal microarterioles and depends on endothelial COX1 and two products that are metabolized by L-PGDS to generate PGD2 that signals via DP1Rs and NO.
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Affiliation(s)
- L Li
- Hypertension Center and Division of Nephrology and Hypertension, Georgetown University, Washington DC, USA.,Kidney Disease Center, the First Affiliated Hospital and Department of Physiology, School of Basic Medical Science, Zhejiang University School of Medicine, Hangzhou, China
| | - E Y Lai
- Hypertension Center and Division of Nephrology and Hypertension, Georgetown University, Washington DC, USA.,Kidney Disease Center, the First Affiliated Hospital and Department of Physiology, School of Basic Medical Science, Zhejiang University School of Medicine, Hangzhou, China
| | - X Cao
- Kidney Disease Center, the First Affiliated Hospital and Department of Physiology, School of Basic Medical Science, Zhejiang University School of Medicine, Hangzhou, China
| | - W J Welch
- Hypertension Center and Division of Nephrology and Hypertension, Georgetown University, Washington DC, USA
| | - C S Wilcox
- Hypertension Center and Division of Nephrology and Hypertension, Georgetown University, Washington DC, USA
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