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Bhaumik S, Lockett J, Saif Z, Lai A, Salomon C, Whitehead J, Clifton VL. The impact of obesity and uncontrolled asthma during pregnancy on metabolic and inflammatory pathways. J Asthma 2022; 60:1141-1152. [PMID: 36214455 DOI: 10.1080/02770903.2022.2134794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Asthma and obesity are both inflammatory complications of pregnancy and when combined contribute to an increased risk of uncontrolled asthma during pregnancy and poor perinatal outcomes. Our previous work has identified the presence of maternal asthma is associated with a proinflammatory milieu in the placenta and reduced fetal growth. The current study was designed to determine the relationships between immunomodulatory metabolic pathways and inflammation and establish whether these pathways are associated with uncontrolled asthma in obese pregnant women.Fifty-three obese (BMI >30) pregnant women were recruited prospectively. Participants were classified as having no asthma, controlled asthma, and uncontrolled asthma based on a doctor diagnosis and assessment using the Asthma Control Questionnaire (ACQ). Circulating plasma concentrations of metabolic hormones leptin, adiponectin, insulin, glucose, and extracellular vesicle (EVs) associated cytokines were measured at 18- and 36-weeks gestation.Concentrations of metabolic and inflammatory markers among obese participants with or without asthma were not significantly different throughout gestation. However total adiponectin concentrations increased as gestation progressed in obese, non-asthmatic women but did not increase in women with asthma. Plasma adiponectin and leptin levels in women with uncontrolled asthma were positively correlated with EV inflammatory markers including GM-CSF, IL-6, TNFα and IFNγ protein.This study demonstrated that most metabolic markers remain unchanged with the presence and severity of asthma in obese pregnant women. However, differences in the associations between metabolic and inflammatory pathways were observed in women with asthma and may be one of the mechanisms contributing to uncontrolled asthma in obese pregnant women.
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Affiliation(s)
- Sreeparna Bhaumik
- Mater Research Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Jack Lockett
- Mater Research Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia.,Department of Diabetes and Endocrinology, Princess Alexandra Hospital, Metro South Health, Brisbane, Australia
| | - Zarqa Saif
- Mater Research Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Andrew Lai
- Exosome Biology Laboratory, Centre for Clinical Diagnostics, UQ Centre for Clinical Research, Royal Brisbane and Women's Hospital, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Carlos Salomon
- Exosome Biology Laboratory, Centre for Clinical Diagnostics, UQ Centre for Clinical Research, Royal Brisbane and Women's Hospital, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Jon Whitehead
- Department of Life Sciences, The University of Lincoln, Lincoln, United Kingdom
| | - Vicki L Clifton
- Mater Research Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
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2
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Gangadharan C, Ahluwalia R, Sigamani A. Diabetes and COVID-19: Role of insulin resistance as a risk factor for COVID-19 severity. World J Diabetes 2021; 12:1550-1562. [PMID: 34630907 PMCID: PMC8472493 DOI: 10.4239/wjd.v12.i9.1550] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 06/11/2021] [Accepted: 07/30/2021] [Indexed: 02/06/2023] Open
Abstract
Patients with diabetes are more susceptible to coronavirus disease 2019 (COVID-19), and as a consequence, develop more severe form of disease. This is partly due to a systemic inflammatory state and pro thrombotic milieu seen in metabolic syndrome. In this review, we attempt to explore the pathogenetic links between insulin resistance and COVID-19 disease severity. Insulin resistance is an underlying condition for metabolic syndromes, including type 2 diabetes, which impairs insulin signaling pathways affecting metabolic and cardiovascular homeostasis. A high concentration of circulating insulin shifts the balance to mitogen activated protein kinase (MAPK)-dependent signaling and causes endothelial cell damage. The phosphatidylinositol 3 kinase and MAPK dependent signaling pathways maintain a balance between nitric oxide-dependent vasodilator and endothelin-1 dependent vasoconstriction actions of insulin. Vascular smooth muscle cell dysfunction is responsible for inflammation and blood coagulation leading to microvascular and macrovascular complications in diabetes. Hyperactivity in renin-angiotensin system is implicated in development of islet oxidative stress and subsequent β-cell dysfunction, as it alters the islet blood flow. These deleterious effects of insulin resistance involving altered blood pressure, vascular dysfunction, and inflammation could be associated with increased severity in COVID-19 patients. We conclude that clinical and/or biochemical markers of insulin resistance should be included as prognostic markers in assessment of acute COVID-19 disease.
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Affiliation(s)
- Charitha Gangadharan
- Department of Clinical Research, Narayana Hrudayalaya Limited, Bangalore 560099, Karnataka, India
| | - Rupa Ahluwalia
- Consultant in Diabetes and Endocrinology, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich NR4 7UY, United Kingdom
| | - Alben Sigamani
- Chief Scientific Officer, Numen Health, Bangalore 560095, Karnataka, India
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3
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Banerjee M, Shaw L, Charlton-Menys V, Pemberton P, Malik RA, Cruickshank JK, Austin CE. Modulation of Small Artery Function by Insulin in Young Women: Role of Adiposity. Endocr Metab Immune Disord Drug Targets 2020; 20:1244-1252. [PMID: 32342823 DOI: 10.2174/1871530320666200428111924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 11/11/2019] [Accepted: 12/03/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVES Vascular dysfunction is common in obesity. Insulin can directly modulate arterial function, but its role is unclear in obesity. We examined the influence of adiposity on direct effects of insulin on human artery responses. METHODS 22 healthy women were stratified by median BMI into lower (LA) (n=11) and higher adiposity (HA) (n=11). Small arteries from gluteal biopsies were tested for contractile responses to Noradrenaline (NA), the endothelium-dependent dilator Carbachol and the endothelium-independent dilator sodium nitroprusside were examined before and after incubation with 100 mU/ml human insulin. RESULTS Contractile responses were similar in the two groups. Insulin reduced NA-induced contraction in HA [3.5 (2.4-4.6) vs. 2.4 (1.4-3.4) mN/mm: p=0.004] but not those from LA [4.1 (2.8-5.3) vs. 3.7 (2.5-5.0) mN/mm: p=0.33]. Endothelium-dependent dilation (EDD) was significantly reduced in arteries from women in the HA (34.7 (18.8-50.6%)) compared to those from women in the LA (62.3 (46.2- 78.4); p=0.013). Insulin improved EDD (change in maximal dilation before/after insulin (%)) in arteries from the HA (37.7 (18.0 to 57.3) but not the LA (6.3 (-6.5 to 19.1), p=0.007. CONCLUSION Reduced EDD evident in arteries from HA subjects improve by incubating in insulin. Hyperinsulinaemia may be necessary in maintaining endothelial function in obesity.
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Affiliation(s)
- Moulinath Banerjee
- Centre for Endocrinology & Diabetes Research Group, University of Manchester, Manchester M13 9NT, United Kingdom,Bolton Foundation NHS Trust, BL4 0JR, United Kingdom
| | - Linda Shaw
- Cardiovascular Research Group, University of Manchester, Manchester M13 9NT, United Kingdom
| | | | - Phillip Pemberton
- Department of Clinical Biochemistry, Central Manchester University Hospitals NHS Foundation Trust, Manchester, M13 9NL, United Kingdom
| | - Rayaz Ahmed Malik
- Centre for Endocrinology & Diabetes Research Group, University of Manchester, Manchester M13 9NT, United Kingdom,Department of Endocrinology, Weil Cornell Medicine, Ar-Rayyan, Qatar
| | - John Kennedy Cruickshank
- Cardiovascular Research Group, University of Manchester, Manchester M13 9NT, United Kingdom,Department of Cardiovascular Medicine & Nutrition, King's College, London, SE1 8WA, United Kingdom
| | - Clare Elizabeth Austin
- Cardiovascular Research Group, University of Manchester, Manchester M13 9NT, United Kingdom,Faculty of Health and Social care, Edgehill University, United Kingdom
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4
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Takenouchi Y, Tsuboi K, Ohsuka K, Nobe K, Ohtake K, Okamoto Y, Kasono K. Chronic Treatment with α-Lipoic Acid Improves Endothelium-Dependent Vasorelaxation of Aortas in High-Fat Diet-Fed Mice. Biol Pharm Bull 2019; 42:1456-1463. [DOI: 10.1248/bpb.b18-00800] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yasuhiro Takenouchi
- Department of Pharmacology, Kawasaki Medical School
- Laboratory of Physiology, Faculty of Pharmaceutical Sciences, Josai University
| | | | - Kenji Ohsuka
- Laboratory of Physiology, Faculty of Pharmaceutical Sciences, Josai University
| | - Koji Nobe
- Division of Pharmacology, Department of Pharmacology, Toxicology and Therapeutics, School of Pharmacy, Showa University
| | - Kazuo Ohtake
- Laboratory of Physiology, Faculty of Pharmaceutical Sciences, Josai University
| | | | - Keizo Kasono
- Laboratory of Physiology, Faculty of Pharmaceutical Sciences, Josai University
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5
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Pasarín M, Abraldes JG, Liguori E, Kok B, La Mura V. Intrahepatic vascular changes in non-alcoholic fatty liver disease: Potential role of insulin-resistance and endothelial dysfunction. World J Gastroenterol 2017; 23:6777-6787. [PMID: 29085222 PMCID: PMC5645612 DOI: 10.3748/wjg.v23.i37.6777] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 09/06/2017] [Accepted: 09/19/2017] [Indexed: 02/06/2023] Open
Abstract
Metabolic syndrome is a cluster of several clinical conditions characterized by insulin-resistance and high cardiovascular risk. Non-alcoholic fatty liver disease is the liver expression of the metabolic syndrome, and insulin resistance can be a frequent comorbidity in several chronic liver diseases, in particular hepatitis C virus infection and/or cirrhosis. Several studies have demonstrated that insulin action is not only relevant for glucose control, but also for vascular homeostasis. Insulin regulates nitric oxide production, which mediates to a large degree the vasodilating, anti-inflammatory and antithrombotic properties of a healthy endothelium, guaranteeing organ perfusion. The effects of insulin on the liver microvasculature and the effects of IR on sinusoidal endothelial cells have been studied in animal models of non-alcoholic fatty liver disease. The hypotheses derived from these studies and the potential translation of these results into humans are critically discussed in this review.
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Affiliation(s)
- Marcos Pasarín
- Hepatic Hemodynamic Laboratory, Liver Unit, Hospital Clinic, IDIBAPS (Institut d’Investigacions Biomèdiques August Pi i Sunyer), University of Barcelona, 08036 Barcelona, Spain
| | - Juan G Abraldes
- Cirrhosis Care Clinic, Division of Gastroenterology (Liver Unit), CEGIIR, University of Alberta, AB T6G 2R3 Edmonton, Canada
| | - Eleonora Liguori
- Internal Medicine, IRCCS San Donato, Department of Biomedical Sciences for Health, University of Milan, 20097 San Donato Milanese, Italy
| | - Beverley Kok
- Cirrhosis Care Clinic, Division of Gastroenterology (Liver Unit), CEGIIR, University of Alberta, AB T6G 2R3 Edmonton, Canada
| | - Vincenzo La Mura
- Internal Medicine, IRCCS San Donato, Department of Biomedical Sciences for Health, University of Milan, 20097 San Donato Milanese, Italy
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6
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Zhu Z, Yang J, Zhong C, Xu T, Wang A, Bu X, Peng Y, Peng H, Xu T, Chen CS, Sun Y, Chen J, Zhang Y, He J. Abnormal glucose regulation, hypoglycemic treatment during hospitalization and prognosis of acute ischemic stroke. J Neurol Sci 2017; 379:177-182. [DOI: 10.1016/j.jns.2017.06.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/13/2017] [Accepted: 06/12/2017] [Indexed: 01/04/2023]
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Ingels C, Vanhorebeek I, Van den Berghe G. Glucose homeostasis, nutrition and infections during critical illness. Clin Microbiol Infect 2017; 24:10-15. [PMID: 28082192 DOI: 10.1016/j.cmi.2016.12.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 12/20/2016] [Accepted: 12/27/2016] [Indexed: 12/17/2022]
Abstract
Critical illness is a complex life-threatening disease characterized by profound endocrine and metabolic alterations and by a dysregulated immune response, together contributing to the susceptibility for nosocomial infections and sepsis. Hitherto, two metabolic strategies have been shown to reduce nosocomial infections in the critically ill, namely tight blood glucose control and early macronutrient restriction. Hyperglycaemia, as part of the endocrine-metabolic responses to stress, is present in virtually all critically ill patients and is associated with poor outcome. Maintaining normoglycaemia with intensive insulin therapy has been shown to reduce morbidity and mortality, by prevention of vital organ dysfunction and prevention of new severe infections. The favourable effects of this intervention were attributed to the avoidance of glucose toxicity and mitochondrial damage in cells of vital organs and in immune cells. Hyperglycaemia was shown to impair macrophage phagocytosis and oxidative burst capacity, which could be restored by targeting normoglycaemia. An anti-inflammatory effect of insulin may have contributed to prevention of collateral damage to host tissues. Not using parenteral nutrition during the first week in intensive care units, and so accepting a large macronutrient deficit, also resulted in fewer secondary infections, less weakness and accelerated recovery. This was at least partially explained by a suppressive effect of early parenteral nutrition on autophagic processes, which may have jeopardized crucial antimicrobial defences and cell damage removal. The beneficial impact of these two metabolic strategies has opened a new field of research that will allow us to improve the understanding of the determinants of nosocomial infections, sepsis and organ failure in the critically ill.
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Affiliation(s)
- C Ingels
- Clinical Department and Laboratory of Intensive Care Medicine, Division Cellular and Molecular Medicine, KU Leuven, Belgium
| | - I Vanhorebeek
- Clinical Department and Laboratory of Intensive Care Medicine, Division Cellular and Molecular Medicine, KU Leuven, Belgium
| | - G Van den Berghe
- Clinical Department and Laboratory of Intensive Care Medicine, Division Cellular and Molecular Medicine, KU Leuven, Belgium.
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8
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Heidarianpour A, Hajizadeh S, Khoshbaten A, Niaki AG, Bigdili MR, Pourkhalili K. Effects of chronic exercise on endothelial dysfunction and insulin signaling of cutaneous microvascular in streptozotocin-induced diabetic rats. ACTA ACUST UNITED AC 2016; 14:746-52. [DOI: 10.1097/hjr.0b013e32817ed02f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Ali Heidarianpour
- Department of Physiology, Faculty of Medical Science, Tarbiat Modares University, Tehran, Iran
| | - Sohrab Hajizadeh
- Department of Physiology, Faculty of Medical Science, Tarbiat Modares University, Tehran, Iran
| | - Ali Khoshbaten
- Department of Physiology, Baghiyatallah Medical Sciences University, Tehran, Iran
| | - Abbas Ghanbari Niaki
- Department of Physical Education and Sport Science, Tarbiat Modares University, Tehran, Iran
| | - Mohammad Reza Bigdili
- Department of Physiology, Faculty of Medical Science, Tarbiat Modares University, Tehran, Iran
| | - Khalil Pourkhalili
- Department of Physiology, Faculty of Medical Science, Tarbiat Modares University, Tehran, Iran
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9
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Woldman YY, Eubank TD, Mock AJ, Stevens NC, Varadharaj S, Turco J, Gavrilin MA, Branchini BR, Khramtsov VV. Detection of nitric oxide production in cell cultures by luciferin-luciferase chemiluminescence. Biochem Biophys Res Commun 2015; 465:232-8. [PMID: 26253471 DOI: 10.1016/j.bbrc.2015.08.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 08/01/2015] [Indexed: 11/24/2022]
Abstract
A chemiluminescent method is proposed for quantitation of NO generation in cell cultures. The method is based on activation of soluble guanylyl cyclase by NO. The product of the guanylyl cyclase reaction, pyrophosphate, is converted to ATP by ATP sulfurylase and ATP is detected in a luciferin-luciferase system. The method has been applied to the measurement of NO generated by activated murine macrophages (RAW 264.7) and bovine aortic endothelial cells. For macrophages activated by lipopolysaccharide and γ-interferon, the rate of NO production is about 100 amol/(cell·min). The rate was confirmed by the measurements of nitrite, the product of NO oxidation. For endothelial cells, the basal rate of NO generation is 5 amol/(cell·min); the rate approximately doubles upon activation by bradykinin, Ca(2+) ionophore A23187 or mechanical stress. For both types of cells the measured rate of NO generation is strongly affected by inhibitors of NO synthase. The sensitivity of the method is about 50 pM/min, allowing the registration of NO generated by 10(2)-10(4) cells. The enzyme-linked chemiluminescent method is two orders of magnitude more sensitive than fluorescent detection using 4-amino-5-methylamino-2',7'-difluorofluorescein (DAF-FM).
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Affiliation(s)
- Yakov Y Woldman
- Department of Chemistry, Valdosta State University, Valdosta, GA 31698, USA.
| | - Tim D Eubank
- Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
| | - Andrew J Mock
- Department of Biology, Valdosta State University, Valdosta, GA 31698, USA
| | - Natalia C Stevens
- Department of Biology, Valdosta State University, Valdosta, GA 31698, USA
| | - Saradhadevi Varadharaj
- Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
| | - Jenifer Turco
- Department of Biology, Valdosta State University, Valdosta, GA 31698, USA
| | - Mikhail A Gavrilin
- Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
| | - Bruce R Branchini
- Department of Chemistry, Connecticut College, New London, CT 06320, USA
| | - Valery V Khramtsov
- Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
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10
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Bruder-Nascimento T, da Silva MAB, Tostes RC. The involvement of aldosterone on vascular insulin resistance: implications in obesity and type 2 diabetes. Diabetol Metab Syndr 2014; 6:90. [PMID: 25352918 PMCID: PMC4210491 DOI: 10.1186/1758-5996-6-90] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Accepted: 08/02/2014] [Indexed: 12/31/2022] Open
Abstract
Aldosterone, a mineralocorticoid hormone produced at the adrenal glands, controls corporal hydroelectrolytic balance and, consequently, has a key role in blood pressure adjustments. Aldosterone also has direct effects in many organs, including the vasculature, leading to many cellular events that influence proliferation, migration, inflammation, redox balance and apoptosis. Aldosterone effects depend on its binding to mineralocorticoid receptors (MR). Aldosterone binding to MR triggers two pathways, the genomic pathway and the non-genomic pathway. In the vasculature e.g., activation of the non-genomic pathway by aldosterone induces rapid effects that involve activation of kinases, phosphatases, transcriptional factors and NAD(P)H oxidases. Aldosterone also plays a crucial role on systemic and vascular insulin resistance, i.e. the inability of a tissue to respond to insulin. Insulin has a critical role on cell function and vascular insulin resistance is considered an early contributor to vascular damage. Accordingly, aldosterone impairs insulin receptor (IR) signaling by altering the phosphatidylinositol 3-kinase (PI3K)/nitric oxide (NO) pathway and by inducing oxidative stress and crosstalk between the IR and the insulin-like growth factor-1 receptor (IGF-1R). This mini-review focuses on the relationship between aldosterone and vascular insulin resistance. Evidence indicating MR antagonists as therapeutic tools to minimize vascular injury associated with obesity and diabetes type 2 is also discussed.
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Affiliation(s)
- Thiago Bruder-Nascimento
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Av Bandeirantes 3900, Ribeirao Preto, SP 14049-900 Brazil
| | - Marcondes AB da Silva
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Av Bandeirantes 3900, Ribeirao Preto, SP 14049-900 Brazil
| | - Rita C Tostes
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Av Bandeirantes 3900, Ribeirao Preto, SP 14049-900 Brazil
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11
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Tota B, Angelone T, Cerra MC. The surging role of Chromogranin A in cardiovascular homeostasis. Front Chem 2014; 2:64. [PMID: 25177680 PMCID: PMC4132265 DOI: 10.3389/fchem.2014.00064] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 07/25/2014] [Indexed: 02/06/2023] Open
Abstract
Together with Chromogranin B and Secretogranins, Chromogranin A (CGA) is stored in secretory (chromaffin) granules of the diffuse neuroendocrine system and released with noradrenalin and adrenalin. Co-stored within the granule together with neuropeptideY, cardiac natriuretic peptide hormones, several prohormones and their proteolytic enzymes, CGA is a multifunctional protein and a major marker of the sympatho-adrenal neuroendocrine activity. Due to its partial processing to several biologically active peptides, CGA appears an important pro-hormone implicated in relevant modulatory actions on endocrine, cardiovascular, metabolic, and immune systems through both direct and indirect sympatho-adrenergic interactions. As a part of this scenario, we here illustrate the emerging role exerted by the full-length CGA and its three derived fragments, i.e., Vasostatin 1, catestatin and serpinin, in the control of circulatory homeostasis with particular emphasis on their cardio-vascular actions under both physiological and physio-pathological conditions. The Vasostatin 1- and catestatin-induced cardiodepressive influences are achieved through anti-beta-adrenergic-NO-cGMP signaling, while serpinin acts like beta1-adrenergic agonist through AD-cAMP-independent NO signaling. On the whole, these actions contribute to widen our knowledge regarding the sympatho-chromaffin control of the cardiovascular system and its highly integrated “whip-brake” networks.
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Affiliation(s)
- Bruno Tota
- Department of Biology, Ecology and Earth Sciences, University of Calabria Arcavacata di Rende (CS), Italy
| | - Tommaso Angelone
- Department of Biology, Ecology and Earth Sciences, University of Calabria Arcavacata di Rende (CS), Italy
| | - Maria C Cerra
- Department of Biology, Ecology and Earth Sciences, University of Calabria Arcavacata di Rende (CS), Italy
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12
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Xiu F, Stanojcic M, Diao L, Jeschke MG. Stress hyperglycemia, insulin treatment, and innate immune cells. Int J Endocrinol 2014; 2014:486403. [PMID: 24899891 PMCID: PMC4034653 DOI: 10.1155/2014/486403] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 04/06/2014] [Accepted: 04/08/2014] [Indexed: 01/04/2023] Open
Abstract
Hyperglycemia (HG) and insulin resistance are the hallmarks of a profoundly altered metabolism in critical illness resulting from the release of cortisol, catecholamines, and cytokines, as well as glucagon and growth hormone. Recent studies have proposed a fundamental role of the immune system towards the development of insulin resistance in traumatic patients. A comprehensive review of published literatures on the effects of hyperglycemia and insulin on innate immunity in critical illness was conducted. This review explored the interaction between the innate immune system and trauma-induced hypermetabolism, while providing greater insight into unraveling the relationship between innate immune cells and hyperglycemia. Critical illness substantially disturbs glucose metabolism resulting in a state of hyperglycemia. Alterations in glucose and insulin regulation affect the immune function of cellular components comprising the innate immunity system. Innate immune system dysfunction via hyperglycemia is associated with a higher morbidity and mortality in critical illness. Along with others, we hypothesize that reduction in morbidity and mortality observed in patients receiving insulin treatment is partially due to its effect on the attenuation of the immune response. However, there still remains substantial controversy regarding moderate versus intensive insulin treatment. Future studies need to determine the integrated effects of HG and insulin on the regulation of innate immunity in order to provide more effective insulin treatment regimen for these patients.
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Affiliation(s)
- Fangming Xiu
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Room D704, Toronto, ON, Canada
| | - Mile Stanojcic
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Room D704, Toronto, ON, Canada
- Sunnybrook Research Institute, University of Toronto, Toronto, ON, Canada M4N 3M5
| | - Li Diao
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Room D704, Toronto, ON, Canada
- Sunnybrook Research Institute, University of Toronto, Toronto, ON, Canada M4N 3M5
| | - Marc G. Jeschke
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Room D704, Toronto, ON, Canada
- Sunnybrook Research Institute, University of Toronto, Toronto, ON, Canada M4N 3M5
- Department of Surgery, Division of Plastic Surgery, Department of Immunology, University of Toronto, Toronto, ON, Canada
- *Marc G. Jeschke:
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Luk A, Ezzat S, Butany J. Pathology, pathophysiology, and treatment strategies of endocrine disorders and their cardiac complications. Semin Diagn Pathol 2013; 30:245-62. [PMID: 24144293 DOI: 10.1053/j.semdp.2013.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The cardiovascular system is affected by a multitude of endocrine disorders, including dysfunction of the thyroid, calcium, glucocorticoids, insulin/glucose, and growth hormone axes. Since most of these changes in the cardiovascular system are reversible when treated, early diagnosis is important, as if left untreated, they may become fatal. This review focuses on the pathophysiology, clinical presentation, pathology, and treatment of patients with these endocrine diseases who present with a variety of cardiovascular manifestations. Neuroendocrine tumors presenting with the carcinoid syndrome and their cardiovascular manifestations are also discussed.
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Affiliation(s)
- Adriana Luk
- Department of Medicine, Toronto General Hospital/University Health Network, Toronto, Ontario, Canada
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14
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Berra-Romani R, Avelino-Cruz JE, Raqeeb A, Della Corte A, Cinelli M, Montagnani S, Guerra G, Moccia F, Tanzi F. Ca²⁺-dependent nitric oxide release in the injured endothelium of excised rat aorta: a promising mechanism applying in vascular prosthetic devices in aging patients. BMC Surg 2013; 13 Suppl 2:S40. [PMID: 24266895 PMCID: PMC3851245 DOI: 10.1186/1471-2482-13-s2-s40] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Background Nitric oxide is key to endothelial regeneration, but it is still unknown whether endothelial cell (EC) loss results in an increase in NO levels at the wound edge. We have already shown that endothelial damage induces a long-lasting Ca2+ entry into surviving cells though connexin hemichannels (CxHcs) uncoupled from their counterparts on ruptured cells. The physiological outcome of injury-induced Ca2+ inflow is, however, unknown. Methods In this study, we sought to determine whether and how endothelial scraping induces NO production (NOP) in the endothelium of excised rat aorta by exploiting the NO-sensitive fluorochrome, DAF-FM diacetate and the Ca2+-sensitive fluorescent dye, Fura-2/AM. Results We demonstrated that injury-induced NOP at the lesion site is prevented in presence of the endothelial NO synthase inhibitor, L-NAME, and in absence of extracellular Ca2+. Unlike ATP-dependent NO liberation, the NO response to injury is insensitive to BTP-2, which selectively blocks store-operated Ca2+ inflow. However, injury-induced NOP is significantly reduced by classic gap junction blockers, and by connexin mimetic peptides specifically targeting Cx37Hcs, Cx40HCs, and Cx43Hcs. Moreover, disruption of caveolar integrity prevents injury-elicited NO signaling, but not the accompanying Ca2+ response. Conclusions The data presented provide the first evidence that endothelial scraping stimulates NO synthesis at the wound edge, which might both exert an immediate anti-thrombotic and anti-inflammatory action and promote the subsequent re-endothelialization.
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Li WA, Moore-Langston S, Chakraborty T, Rafols JA, Conti AC, Ding Y. Hyperglycemia in stroke and possible treatments. Neurol Res 2013; 35:479-91. [PMID: 23622737 DOI: 10.1179/1743132813y.0000000209] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Hyperglycemia affects approximately one-third of acute ischemic stroke patients and is associated with poor clinical outcomes. In experimental and clinical stroke studies, hyperglycemia has been shown to be detrimental to the penumbral tissue for several reasons. First, hyperglycemia exacerbates both calcium imbalance and the accumulation of reactive oxygen species (ROS) in neurons, leading to increased apoptosis. Second, hyperglycemia fuels anaerobic energy production, causing lactic acidosis, which further stresses neurons in the penumbral regions. Third, hyperglycemia decreases blood perfusion after ischemic stroke by lowering the availability of nitric oxide (NO), which is a crucial mediator of vasodilation. Lastly, hyperglycemia intensifies the inflammatory response after stroke, causing edema, and hemorrhage through disruption of the blood brain barrier and degradation of white matter, which leads to a worsening of functional outcomes. Many neuroprotective treatments addressing hyperglycemia in stroke have been implemented in the past decade. Early clinical use of insulin provided mixed results due to insufficiently controlled glucose levels and heterogeneity of patient population. Recently, however, the latest Stroke Hyperglycemia Insulin Network Effort trial has addressed the shortcomings of insulin therapy. While glucagon-like protein-1 administration, hyperbaric oxygen preconditioning, and ethanol therapy appear promising, these treatments remain in their infancy and more research is needed to better understand the mechanisms underlying hyperglycemia-induced injuries. Elucidation of these mechanistic pathways could lead to the development of rational treatments that reduce hyperglycemia-associated injuries and improve functional outcomes for ischemic stroke patients.
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Affiliation(s)
- William A Li
- Department of Neurological Surgery, Wayne State University School of Medicine, Detroit, MI, USA
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16
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Zhang Y, Zhuang R, Geng C, Cai X, Lei W, Tian N, Gao F. Insulin promotes T cell recovery in a murine model of autoimmune myocarditis. Clin Exp Immunol 2013. [PMID: 23199322 DOI: 10.1111/j.1365-2249.2012.04662.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Glucose-insulin-potassium (GIK) is a useful adjunct to myocarditis. Besides its essential action in energy metabolism, insulin also exerts an anti-inflammatory effect. This study investigated the effect of insulin on myocardial inflammation in experimental autoimmune myocarditis (EAM) in mice and its potential role in T cell regulation. Mice were divided randomly into a normal control group, a saline-treated EAM group and an insulin-treated EAM group. The histopathological changes of myocardium, α-myosin heavy chain (MyHCα)(614-629) antigen-specific autoantibody titre, the serum level of cardiac troponin I (cTnI), mitogen-activated protein kinase (MAPK) family members' activity and content were measured. Furthermore, the phenotype of T lymphocyte subsets in splenocytes was analysed to evaluate the immune status of mice. Insulin reduced serum cTnI of EAM mice on days 14 and 21 (P < 0·05) after immunization, with no changes in blood glucose and autoantibody production. Western blot revealed that extracellular signal-regulated protein kinase (ERK1/2) may be a determining factor in this process. Total ERK1/2 and phospho-ERK1/2 (p-ERK1/2) were both up-regulated in insulin-treated mice after immunization. We also found that insulin treatment promoted T cell recovery without changing the naive-to-memory T-cell ratio; in particular, CD3(+) T cells in insulin-treated mice proliferated more vigorously than in control mice (P < 0·05). We report here for the first time that insulin alleviates myocarditis in the EAM model. These data show that insulin has a direct effect on T cell proliferation in EAM. It is possible that GIK or insulin may assist T cell recovery towards normal in myocarditis, especially for diabetic or hyperglycaemic patients.
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Affiliation(s)
- Y Zhang
- Department of Physiology, Fourth Military Medical University, Xi'an, China
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17
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van Langen J, Fransen P, Van Hove CE, Schrijvers DM, Martinet W, De Meyer GR, Bult H. Selective loss of basal but not receptor-stimulated relaxation by endothelial nitric oxide synthase after isolation of the mouse aorta. Eur J Pharmacol 2012; 696:111-9. [DOI: 10.1016/j.ejphar.2012.09.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 09/05/2012] [Accepted: 09/17/2012] [Indexed: 12/21/2022]
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18
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Cerqueira FM, Brandizzi LI, Cunha FM, Laurindo FRM, Kowaltowski AJ. Serum from calorie-restricted rats activates vascular cell eNOS through enhanced insulin signaling mediated by adiponectin. PLoS One 2012; 7:e31155. [PMID: 22319612 PMCID: PMC3271099 DOI: 10.1371/journal.pone.0031155] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Accepted: 01/03/2012] [Indexed: 01/04/2023] Open
Abstract
eNOS activation resulting in mitochondrial biogenesis is believed to play a central role in life span extension promoted by calorie restriction (CR). We investigated the mechanism of this activation by treating vascular cells with serum from CR rats and found increased Akt and eNOS phosphorylation, in addition to enhanced nitrite release. Inhibiting Akt phosphorylation or immunoprecipitating adiponectin (found in high quantities in CR serum) completely prevented the increment in nitrite release and eNOS activation. Overall, we demonstrate that adiponectin in the serum from CR animals increases NO• signaling by activating the insulin pathway. These results suggest this hormone may be a determinant regulator of the beneficial effects of CR.
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Affiliation(s)
- Fernanda M. Cerqueira
- Instituto de Química, Departamento de Bioquímica, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Laura I. Brandizzi
- Instituto do Coração, Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Fernanda M. Cunha
- Instituto de Química, Departamento de Bioquímica, Universidade de São Paulo, São Paulo, São Paulo, Brazil
- Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Francisco R. M. Laurindo
- Instituto do Coração, Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Alicia J. Kowaltowski
- Instituto de Química, Departamento de Bioquímica, Universidade de São Paulo, São Paulo, São Paulo, Brazil
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Pansuria M, Xi H, Li L, Yang XF, Wang H. Insulin resistance, metabolic stress, and atherosclerosis. Front Biosci (Schol Ed) 2012; 4:916-31. [PMID: 22202099 PMCID: PMC3319745 DOI: 10.2741/s308] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Atherosclerosis, a pathological process that underlies the development of cardiovascular disease, is the primary cause of morbidity and mortality in patients with type 2 diabetes mellitus (T2DM). T2DM is characterized by hyperglycemia and insulin resistance (IR), in which target tissues fail to respond to insulin. Systemic IR is associated with impaired insulin signaling in the metabolic tissues and vasculature. Insulin receptor is highly expressed in the liver, muscle, pancreas, and adipose tissue. It is also expressed in vascular cells. It has been suggested that insulin signaling in vascular cells regulates cell proliferation and vascular function. In this review, we discuss the association between IR, metabolic stress, and atherosclerosis with focus on 1) tissue and cell distribution of insulin receptor and its differential signaling transduction and 2) potential mechanism of insulin signaling impairment and its role in the development of atherosclerosis and vascular function in metabolic disorders including hyperglycemia, hypertension, dyslipidemia, and hyperhomocysteinemia. We propose that insulin signaling impairment is the foremost biochemical mechanism underlying increased cardiovascular morbidity and mortality in atherosclerosis, T2DM, and metabolic syndrome.
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Affiliation(s)
- Meghana Pansuria
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA, 19140
- Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA, 19140
| | - Hang Xi
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA, 19140
- Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA, 19140
| | - Le Li
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA, 19140
- School of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, PR, China
| | - Xiao-Feng Yang
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA, 19140
- Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA, 19140
| | - Hong Wang
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA, 19140
- Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA, 19140
- Thrombosis Research Center of Temple University School of Medicine, Philadelphia, PA, 19140
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20
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Zhao Z, Luo Z, Wang P, Sun J, Yu H, Cao T, Ni Y, Chen J, Yan Z, Liu D, Zhu Z. Rosiglitazone Restores Endothelial Dysfunction in a Rat Model of Metabolic Syndrome through PPARγ- and PPARδ-Dependent Phosphorylation of Akt and eNOS. PPAR Res 2011; 2011:291656. [PMID: 22190906 PMCID: PMC3236323 DOI: 10.1155/2011/291656] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 08/31/2011] [Accepted: 09/06/2011] [Indexed: 12/14/2022] Open
Abstract
Vascular endothelial dysfunction has been demonstrated in metabolic syndrome (MS). Chronic administration of rosiglitazone ameliorates endothelial dysfunction through PPARγ-mediated metabolic improvements. Recently, studies suggested that single dose of rosiglitazone also has direct vascular effects, but the mechanisms remain uncertain. Here we established a diet-induced rat model of MS. The impaired vasorelaxation in MS rats was improved by incubating arteries with rosiglitazone for one hour. Importantly, this effect was blocked by either inhibition of PPARγ or PPARδ. In cultured endothelial cells, acute treatment with rosiglitazone increased the phosphorylation of Akt and eNOS and the production of NO. These effects were also abolished by inhibition of PPARγ, PPARδ, or PI3K. In conclusion, rosiglitazone improved endothelial function through both PPARγ- and PPARδ-mediated phosphorylation of Akt and eNOS, which might help to reconsider the complex effects and clinical applications of rosiglitazone.
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Affiliation(s)
- Zhigang Zhao
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Zhidan Luo
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Peijian Wang
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Jing Sun
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Hao Yu
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Tingbing Cao
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Yinxing Ni
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Jing Chen
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Zhencheng Yan
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Daoyan Liu
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
| | - Zhiming Zhu
- Center for Hypertension and Metabolic Diseases, Department of Hypertension and Endocrinology, Daping Hospital, Third Military Medical University, Chongqing Institute of Hypertension, Chongqing 400042, China
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21
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Angelone T, Quintieri AM, Pasqua T, Gentile S, Tota B, Mahata SK, Cerra MC. Phosphodiesterase type-2 and NO-dependent S-nitrosylation mediate the cardioinhibition of the antihypertensive catestatin. Am J Physiol Heart Circ Physiol 2011; 302:H431-42. [PMID: 22058158 DOI: 10.1152/ajpheart.00491.2011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The chromogranin A (CHGA)-derived peptide catestatin (CST: hCHGA(352-372)) is a noncompetitive catecholamine-release inhibitor that exerts vasodilator, antihypertensive, and cardiosuppressive actions. We have shown that CST directly influences the basal performance of the vertebrate heart where CST dose dependently induced a nitric oxide-cGMP-dependent cardiosuppression and counteracted the effects of adrenergic stimulation through a noncompetitive antagonism. Here, we sought to determine the specific intracardiac signaling activated by CST in the rat heart. Physiological analyses performed on isolated, Langendorff-perfused cardiac preparations revealed that CST-induced negative inotropism and lusitropism involve β(2)/β(3)-adrenergic receptors (β(2)/β(3)-AR), showing a higher affinity for β(2)-AR. Interaction with β(2)-AR activated phosphatidylinositol 3-kinase/endothelial nitric oxide synthase (eNOS), increased cGMP levels, and induced activation of phosphodiesterases type 2 (PDE2), which was found to be involved in the antiadrenergic action of CST as evidenced by the decreased cAMP levels. CST-dependent negative cardiomodulation was abolished by functional denudation of the endothelium with Triton. CST also increased the eNOS expression in cardiac tissue and human umbilical vein endothelial cells. cells, confirming the involvement of the vascular endothelium. In ventricular extracts, CST increased S-nitrosylation of both phospholamban and β-arrestin, suggesting an additional mechanism for intracellular calcium modulation and β-adrenergic responsiveness. We conclude that PDE2 and S-nitrosylation play crucial roles in the CST regulation of cardiac function. Our results are of importance in relation to the putative application of CST as a cardioprotective agent against stress, including excessive sympathochromaffin overactivation.
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Affiliation(s)
- Tommaso Angelone
- Department of Cell Biology, Laboratory of Cardiovascular Pathophysiology, University of Calabria, Arcavacata di Rende (CS), Italy.
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22
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Rodrigues AM, Bergamaschi CT, Araújo RC, Mouro MG, Rosa TS, Higa EMS. Effects of training and nitric oxide on diabetic nephropathy progression in type I diabetic rats. Exp Biol Med (Maywood) 2011; 236:1180-7. [PMID: 21930716 DOI: 10.1258/ebm.2011.011005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The aim of the paper is to assess nitric oxide (NO) production during aerobic training and its role on the progression of diabetic nephropathy in rats. Induction of diabetes mellitus (DM) was achieved in adult male Wistar rats with streptozotocin. Half of the animals underwent training on a treadmill and the others (sedentary) stayed on a turned-off treadmill for the same period according to the following groups: sedentary control (CTL + SE); training control (CTL + EX); sedentary diabetic (DM + SE); and training diabetic (DM + EX) (n = 9 for all groups). The training on treadmill was carried out at a work rate of 16 m/min, 60 min/d, 5 d/week for eight weeks. Before and after the exercises, rats were placed in individual metabolic cages with standard chow and water ad libitum, for 24-h urine collection, followed by three hours' fasting blood sample withdrawal from the retro-orbital plexus, under anesthesia. Diabetic animals showed reduction of body weight, creatinine and urea depurations and NO excretion, increased blood glucose concentrations, albuminuria and thiobarbituric acid reactive substance (TBARS) excretion, when compared with the respective controls. All these alterations induced by DM were attenuated in the DM + EX versus DM + SE group. Analysis of insulin concentrations at the end of the protocol showed no significant change between the DM + SE and DM + EX groups. In conclusion, our data show that a routine physical exercise resulted in a better control of glycemia with an increased NO bioavailability and oxidative stress control, associated with an amelioration of renal function. We suggest aerobic training and the control of oxidative and nitrosative stress as useful non-pharmacological tools to delay the progression of diabetic nephropathy.
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Affiliation(s)
- Adelson M Rodrigues
- Department of Medicine, Nephrology Division, UNIFESP/Escola Paulista de Medicina, 04023-900 São Paulo, SP, Brazil
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23
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Rozance PJ, Seedorf GJ, Brown A, Roe G, O'Meara MC, Gien J, Tang JR, Abman SH. Intrauterine growth restriction decreases pulmonary alveolar and vessel growth and causes pulmonary artery endothelial cell dysfunction in vitro in fetal sheep. Am J Physiol Lung Cell Mol Physiol 2011; 301:L860-71. [PMID: 21873446 DOI: 10.1152/ajplung.00197.2011] [Citation(s) in RCA: 152] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Intrauterine growth restriction (IUGR) increases the risk for bronchopulmonary dysplasia (BPD). Abnormal lung structure has been noted in animal models of IUGR, but whether IUGR adversely impacts fetal pulmonary vascular development and pulmonary artery endothelial cell (PAEC) function is unknown. We hypothesized that IUGR would decrease fetal pulmonary alveolarization, vascular growth, and in vitro PAEC function. Studies were performed in an established model of severe placental insufficiency and IUGR induced by exposing pregnant sheep to elevated temperatures. Alveolarization, quantified by radial alveolar counts, was decreased 20% (P < 0.005) in IUGR fetuses. Pulmonary vessel density was decreased 44% (P < 0.01) in IUGR fetuses. In vitro, insulin increased control PAEC migration, tube formation, and nitric oxide (NO) production. This response was absent in IUGR PAECs. VEGFA stimulated tube formation, and NO production also was absent. In control PAECs, insulin increased cell growth by 68% (P < 0.0001). Cell growth was reduced in IUGR PAECs by 29% at baseline (P < 0.01), and the response to insulin was attenuated (P < 0.005). Despite increased basal and insulin-stimulated Akt phosphorylation in IUGR PAECs, endothelial NO synthase (eNOS) protein expression as well as basal and insulin-stimulated eNOS phosphorylation were decreased in IUGR PAECs. Both VEGFA and VEGFR2 also were decreased in IUGR PAECs. We conclude that fetuses with IUGR are characterized by decreased alveolar and vascular growth and PAEC dysfunction in vitro. This may contribute to the increased risk for adverse respiratory outcomes and BPD in infants with IUGR.
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Affiliation(s)
- Paul J Rozance
- Division of Neonatology, Pediatric Heart Lung Center, Department of Pediatrics, University of Colorado Denver School of Medicine, Aurora, USA.
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24
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Signorello MG, Giacobbe E, Passalacqua M, Leoncini G. The anandamide effect on NO/cGMP pathway in human platelets. J Cell Biochem 2011; 112:924-32. [PMID: 21328466 DOI: 10.1002/jcb.23008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In this study the effect of the endocannabinoid anandamide on platelet nitric oxide (NO)/cGMP pathway was investigated. Data report that anandamide in a dose-and time-dependent manner increased NO and cGMP levels and stimulated endothelial nitric oxide synthase (eNOS) activity. These parameters were significantly reduced by LY294002, selective inhibitor of PI3K and by MK2206, specific inhibitor of AKT. Moreover anandamide stimulated both eNOSser1177 and AKTser473 phosphorylation. Finally the anandamide effect on NO and cGMP levels, eNOS and AKT phosphorylation/activation were inhibited by SR141716, specific cannabinoid receptor 1 antagonist, supporting the involvement of anandamide binding to this receptor. Overall data of this report indicate that low concentrations of anandamide, through PI3K/AKT pathway activation, stimulates eNOS activity and increases NO levels in human platelets. In such way anandamide contributes to extend platelet survival.
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25
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Bassino E, Fornero S, Gallo MP, Ramella R, Mahata SK, Tota B, Levi R, Alloatti G. A novel catestatin-induced antiadrenergic mechanism triggered by the endothelial PI3K-eNOS pathway in the myocardium. Cardiovasc Res 2011; 91:617-24. [PMID: 21543385 DOI: 10.1093/cvr/cvr129] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIMS Catestatin (CST) is a chromogranin A (CgA)-derived peptide (hCgA352-372) with three identified human variants (G364S/P370L/R374Q-CST) that show differential potencies towards the inhibition of catecholamine release. Although CST affects several cardiovascular parameters, the mechanisms underlying CST action in the heart have remained elusive. Therefore, we sought to determine the mechanism of action of CST and its variants on ventricular myocardium and endothelial cells. METHODS AND RESULTS Contractile force and Ca(2+) transients were measured, respectively, on rat papillary muscles and isolated cardiomyocytes (CC) under basal conditions and after β-adrenergic stimulation. Nitric oxide (NO) production and endothelial nitric oxide synthase (eNOS) phosphorylation (P(Ser1179)eNOS) were studied in bovine aortic endothelial (BAE-1) cells. Under basal conditions, wild-type CST (WT-CST, 10-50 nM) transiently enhanced myocardial contractility. CST variants (G364S and P370L) exerted a comparable positive inotropic effect. The H(1) histamine receptor antagonist mepyramine abolished the increase of contractile force induced by WT-CST. Moreover, WT-CST dose-dependently (5-50 nM) reduced the effect of β-adrenergic stimulation. This anti-adrenergic effect was not mediated by a direct action on CC, but involved a PI3K-dependent NO release from endocardial endothelial cells. Indeed, CST induced a wortmannin-sensitive, Ca(2+)-independent increase in NO production and eNOS phosphorylation on BAE-1 cells. While the anti-adrenergic and NO release effects of P370L-CST were comparable with those of WT-CST, the G364S variant was ineffective on the same parameters. CONCLUSION Our results suggest that the anti-adrenergic action of CST depends on the endothelial PI3K-Akt-eNOS pathway and that its structural alterations entail functional features that correlate with the different anti-hypertensive potential described in humans.
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Affiliation(s)
- Eleonora Bassino
- Department of Animal and Human Biology, University of Turin, via Accademia Albertina, 13, 10123 Turin, Italy
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26
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Chen Y. Relationships between insulin resistant and hypertension and traditional Chinese medicine intervention. ACTA ACUST UNITED AC 2010; 8:1114-8. [DOI: 10.3736/jcim20101202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Li R, Lau WB, Ma XL. Adiponectin resistance and vascular dysfunction in the hyperlipidemic state. Acta Pharmacol Sin 2010; 31:1258-66. [PMID: 20802503 PMCID: PMC4012912 DOI: 10.1038/aps.2010.95] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Accepted: 06/22/2010] [Indexed: 12/16/2022] Open
Abstract
Insulin plays an important role in the stimulation of vascular nitric oxide production, with both short term (vasomotility and anti-thrombotic effects) and long term (smooth muscle cell growth and migration inhibition) benefits. Impaired vasodilatory response to insulin, the hallmark of vascular insulin resistance (IR), has important implications for circulatory pathophysiology. An association between adipokines and IR has been observed in both diabetic and nondiabetic states. Adiponectin (APN) is an insulin-sensitizing adipokine known to stimulate skeletal muscle fatty acid (FA) oxidation and reduce lipid accumulation. Recent demonstrations of potential cross-talk between APN and insulin in vascular function regulation are particularly interesting. The lipid accumulation observed after chronic high-fat (HF) diets and in the obese state may reduce vascular response to APN, a pathologic state termed as APN resistance. This review highlights the importance of insulin sensitivity and APN activity in the maintenance of endothelial function. It explores the relationships between vascular IR and APN resistance in the hyperlipidemic pathological condition, representative of the metabolic syndrome. The investigation of vascular insulin and APN resistance provides not only better understanding of vascular pathophysiology, but also an opportunity for therapeutic targeting in individuals affected by the metabolic syndrome.
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Affiliation(s)
- Rong Li
- Department of Geriatrics, Xijing Hospital, Xi-an 710032, China
| | - Wayne Bond Lau
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Xin Liang Ma
- Department of Geriatrics, Xijing Hospital, Xi-an 710032, China
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA
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28
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Brero A, Ramella R, Fitou A, Dati C, Alloatti G, Gallo MP, Levi R. Neuregulin-1beta1 rapidly modulates nitric oxide synthesis and calcium handling in rat cardiomyocytes. Cardiovasc Res 2010; 88:443-52. [PMID: 20634213 DOI: 10.1093/cvr/cvq238] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
AIMS The ErbB-neuregulin-1β1 (Nrg1β1) pathway is required for cardiac development and exerts chronic effects on the postnatal adult heart. Long-term application of Nrg1β1 results in hypertrophy and protection against oxidative stress and cytotoxic agents. We performed experiments with acute Nrg1β1 treatment to find evidence for a further protective role due to rapid modulation of adult cardiomyocyte function. METHODS AND RESULTS In confocal fluorimetric measurements, Nrg1β1 induced a calcium-independent increase in nitric oxide (NO) production in isolated adult rat ventricular myocytes (ARVCMs) that was blocked by the phosphoinositide-3-kinase (PI3K) inhibitor Wortmannin. Western blot analysis showed enhancement of endothelial nitric oxide synthase phosphorylation in Nrg1β1-treated ARVCMs, which was attenuated by Wortmannin. Nrg1β1 induced a significant increase in calcium transient amplitude (indo-1 ratiometric measurement) and accelerated the recovery of cytosolic calcium in the sarcoplasmic reticulum without affecting whole-cell L-type calcium current. Wortmannin or the protein kinase G inhibiting peptide (DT-2) abolished the increase in calcium transient amplitude and the acceleration of calcium recovery induced by Nrg1β1 treatment. Immunofluorescence analysis revealed that Nrg1β1 treatment increased phospholamban phosphorylation, and the effect was blocked by PI3K and protein kinase G inhibition. Caffeine-releasable sarcoplasmic reticulum calcium content was also higher during Nrg1β1 administration. CONCLUSION Rapid activation of PI3K, endothelial nitric oxide synthase and protein kinase G and a consequent improvement in diastolic calcium can be added to established Nrg1 protective roles.
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Affiliation(s)
- Alessia Brero
- Department of Animal and Human Biology, University of Turin, Via Accademia Albertina 13, 10123, Turin, Italy
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29
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Quinn TJ, Dawson J, Walters MR. Sugar and Stroke: Cerebrovascular Disease and Blood Glucose Control. Cardiovasc Ther 2010; 29:e31-42. [DOI: 10.1111/j.1755-5922.2010.00166.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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30
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Tabit CE, Chung WB, Hamburg NM, Vita JA. Endothelial dysfunction in diabetes mellitus: molecular mechanisms and clinical implications. Rev Endocr Metab Disord 2010; 11:61-74. [PMID: 20186491 PMCID: PMC2882637 DOI: 10.1007/s11154-010-9134-4] [Citation(s) in RCA: 384] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cardiovascular disease is a major complication of diabetes mellitus, and improved strategies for prevention and treatment are needed. Endothelial dysfunction contributes to the pathogenesis and clinical expression of atherosclerosis in diabetes mellitus. This article reviews the evidence linking endothelial dysfunction to human diabetes mellitus and experimental studies that investigated the responsible mechanisms. We then discuss the implications of these studies for current management and for new approaches for the prevention and treatment of cardiovascular disease in patients with diabetes mellitus.
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Affiliation(s)
- Corey E. Tabit
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, USA
| | - William B. Chung
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, USA
| | - Naomi M. Hamburg
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, USA
| | - Joseph A. Vita
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, USA
- Section of Cardiology, Boston Medical Center, 88 East Newton Street, Boston, MA 02118, USA,
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31
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Jiménez R, Sánchez M, Zarzuelo MJ, Romero M, Quintela AM, López-Sepúlveda R, Galindo P, Gómez-Guzmán M, Haro JM, Zarzuelo A, Pérez-Vizcaíno F, Duarte J. Endothelium-dependent vasodilator effects of peroxisome proliferator-activated receptor beta agonists via the phosphatidyl-inositol-3 kinase-Akt pathway. J Pharmacol Exp Ther 2009; 332:554-61. [PMID: 19906781 DOI: 10.1124/jpet.109.159806] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Peroxisome proliferator-activated receptor beta/delta (PPAR-beta) is a ligand-activated transcription factor belonging to the nuclear hormone receptor superfamily that regulates the transcription of many target genes. More recently, acute, nongenomic effects of PPAR-beta agonists have also been described. In the present study, we hypothesized that PPAR-beta agonists might exert acute nongenomic effects on vascular tone. Here, we report that the structurally unrelated PPAR-beta ligands [4-[3-(4-acetyl-3-hydroxy-2-propylphenoxy)propoxy]phenoxy]acetic acid (L-165041) and 4-[[[2-[3-fluoro-4-(trifluoromethyl)phenyl]-4-methyl-5-thiazolyl] methyl]thio]-2-methylphenoxy]acetic acid (GW0742) induced vascular relaxation in phenylephrine-precontracted endothelium-intact rat aortic rings, which was significantly inhibited by endothelial denudation or nitric-oxide synthase (NOS) inhibition with N(G)-nitro-l-arginine methylester. These relaxant effects reached steady state within 15 min. The relaxation induced by L-165041 and GW0742 in aortic rings precontracted with the thromboxane A(2) analog 9,11-dideoxy-11alpha,9alpha-epoxymethanoprostaglandin F2alpha (U-46619) was unaffected either by removal of extracellular calcium or by incubation with calcium-free solution containing the intracellular calcium chelator 1,2-bis-(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid tetra(acetoxymethyl) ester. However, the phosphatidylinositol 3-kinase (PI3K) inhibitor 2-(4-morpholinyl)-8-phenyl-1(4H)-benzopyran-4-one hydrochloride (LY-294002) inhibited the endothelium-dependent relaxant responses induced by both PPAR-beta agonists. Blockade of PPAR-beta with 3-[[[2-methoxy-4-(phenylamino)phenyl]amino]sulfonyl]-2-thiophenecarboxylic acid methyl ester (GSK0660) also partially inhibited these relaxant responses, although PPAR-gamma blockade with 2-chloro-5-nitro-N-phenylbenzamide (GW9662) had no effect. In human umbilical vein endothelial cells, L-165041 and GW0742 increased nitric oxide (NO) production and Akt and endothelial NOS (eNOS) phosphorylation, which were sensitive to PI3K inhibition and PPAR-beta blockade. In conclusion, the PPAR-beta agonists acutely caused vasodilatation, which was partially dependent on endothelial-derived NO. The eNOS activation is calcium-independent and seems to be related to activation of the PI3K-Akt-eNOS pathway.
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Affiliation(s)
- Rosario Jiménez
- Department of Pharmacology, School of Pharmacy, University of Granada, Granada, Spain
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32
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Deng HP, Chai JK. The effects and mechanisms of insulin on systemic inflammatory response and immune cells in severe trauma, burn injury, and sepsis. Int Immunopharmacol 2009; 9:1251-9. [DOI: 10.1016/j.intimp.2009.07.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Revised: 07/09/2009] [Accepted: 07/21/2009] [Indexed: 12/16/2022]
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33
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Potenza MA, Addabbo F, Montagnani M. Vascular actions of insulin with implications for endothelial dysfunction. Am J Physiol Endocrinol Metab 2009; 297:E568-77. [PMID: 19491294 DOI: 10.1152/ajpendo.00297.2009] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Hemodynamic actions of insulin depend largely on the hormone's ability to stimulate synthesis and release of endothelial mediators, whose balanced activity ensures dynamic control of vascular function. Nitric oxide (NO), endothelin-1 (ET-1), and reactive oxygen species (ROS) are important examples of endothelial mediators with opposing properties on vascular tone, hemostatic processes, and vascular permeability. Reduced NO bioavailability, resulting from either insufficient production or increased degradation of NO, characterizes endothelial dysfunction. In turn, endothelial dysfunction predicts vascular complications of metabolic and hemodynamic disorders. In the cardiovascular system, insulin stimulates the production and release of NO, ET-1, and ROS via activation of distinct intracellular signaling pathways. Under insulin-resistant conditions, increased insulin concentrations and/or impaired insulin-signaling pathways in the vasculature may contribute to imbalance in secretion of endothelial mediators that promote pathogenesis of vascular abnormalities. This short review describes signaling pathways involved in insulin-stimulated release of NO, ROS, and ET-1 and suggests possible molecular mechanisms by which abnormal insulin signaling may contribute to endothelial dysfunction.
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Affiliation(s)
- Maria Assunta Potenza
- Department of Pharmacology and Human Physiology, Medical School, University of Bari, Bari, Italy
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34
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Huynh NN, Andrews KL, Head GA, Khong SML, Mayorov DN, Murphy AJ, Lambert G, Kiriazis H, Xu Q, Du XJ, Chin-Dusting JPF. Arginase II knockout mouse displays a hypertensive phenotype despite a decreased vasoconstrictory profile. Hypertension 2009; 54:294-301. [PMID: 19546381 DOI: 10.1161/hypertensionaha.108.121731] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Arginase upregulation is associated with aging and cardiovascular diseases. In this study we report on the cardiovascular phenotype of the arginase II knockout (KO) mouse. We demonstrate that vascular sensitivity and reactivity altered over time in these animals such that no influence on responses to vasoconstrictor activity was observed in 7-week-old KO mice, but dampened responses to norepinephrine and phenylephrine were observed by 10 and 15 weeks with Rho kinase influencing these effects in the 15-week-old animals. Despite these dampened vasoconstrictory responses, KO mice demonstrated increased mean arterial pressure from 8 weeks old. This hypertensive phenotype was associated with an increase in left ventricular weight, left ventricular systolic pressure, and diminished diastolic function. KO mice also show enhanced plasma norepinephrine turnover, suggesting an increased sympathetic outflow. In conclusion, our data suggest that global loss of arginase II activity results in hypertension. We suggest that this strain of mouse warrants further investigation as a potentially novel model of hypertension.
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Affiliation(s)
- Ngan N Huynh
- Vascular Pharmacology, Baker IDI Heart and Diabetes Institute, PO Box 6492 St Kilda Rd Central, Victoria, 8008 Australia
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35
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Bouglé A, Annane D. Les effets de l’insuline : de la cellule à l’organisme entier. ACTA ACUST UNITED AC 2009; 28:e193-9. [DOI: 10.1016/j.annfar.2009.02.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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36
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Schulman IH, Zhou MS. Vascular insulin resistance: a potential link between cardiovascular and metabolic diseases. Curr Hypertens Rep 2009; 11:48-55. [PMID: 19146801 DOI: 10.1007/s11906-009-0010-0] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The physiologic actions of insulin in the vasculature serve to couple regulation of metabolic and hemodynamic homeostasis. Insulin activation of the phosphatidylinositol-3-kinase (PI3K) pathway promotes glucose uptake in insulin-responsive tissues and nitric oxide (NO) production in the endothelium. NO induces vasodilation and inhibits platelet aggregation and vascular smooth muscle cell growth. In contrast, insulin activation of the mitogen-activated protein kinase (MAPK) leads to vasoconstriction and pathologic vascular cellular growth. In states of insulin resistance, insulin activation of PI3K is selectively impaired, whereas the MAPK pathway is spared and activated normally. In the endothelium, selective impairment of insulin-mediated NO production may contribute to the development of hypertension, endothelial dysfunction, atherogenesis, and insulin resistance. This article reviews experimental and clinical data elucidating the physiologic and pathophysiologic role of insulin in the vasculature and the mechanisms contributing to the development of vascular and metabolic diseases.
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Affiliation(s)
- Ivonne Hernandez Schulman
- Vascular Biology Institute, University of Miami Miller School of Medicine, Veterans Affairs Medical Center, Nephrology-Hypertension Section, 1201 Northwest 16th Street, Miami, FL 33125, USA.
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37
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Nacci C, Tarquinio M, Montagnani M. Molecular and clinical aspects of endothelial dysfunction in diabetes. Intern Emerg Med 2009; 4:107-16. [PMID: 19280353 DOI: 10.1007/s11739-009-0234-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Accepted: 02/16/2009] [Indexed: 10/21/2022]
Abstract
Diabetic patients have an increased risk for cardiovascular complications with respect to the general population. Micro- and macrovascular complications such as nephropathy, retinopathy, atherosclerosis, and coronary artery disease are usually preceded by endothelial dysfunction, a condition characterized by impaired vasorelaxation resulting from reduced bioavailability of the endothelial mediator nitric oxide (NO). Nitric oxide is among endothelial mediators released by endothelial cells in response to insulin stimulation. Therefore, metabolic abnormalities such as insulin resistance, dyslipidemia, compensatory hyperinsulinemia and overt hyperglycemia may all contribute to impaired NO bioavailability and abnormal vasodilatation in diabetic patients. Each of these alterations may trigger endothelial dysfunction by multiple intracellular mechanisms including accelerated formation of advanced glycolysis end products, activation of protein kinase C, increased pro-inflammatory signaling, and impaired sensitivity of the PI 3-kinase signaling pathways. This review outlines the most important mechanisms by which insulin takes part in physiological regulation of endothelial function. Abnormal insulin signaling in endothelium under diabetic conditions and patho-physiological consequences on cardiovascular homeostasis will also be discussed.
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Affiliation(s)
- Carmela Nacci
- Department of Pharmacology and Human Physiology, Medical School, University of Bari, Policlinico-Piazza G. Cesare 11, Bari, Italy
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38
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Martínez MC, Andriantsitohaina R. Reactive nitrogen species: molecular mechanisms and potential significance in health and disease. Antioxid Redox Signal 2009; 11:669-702. [PMID: 19014277 DOI: 10.1089/ars.2007.1993] [Citation(s) in RCA: 159] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Reactive nitrogen species (RNS) are various nitric oxide-derived compounds, including nitroxyl anion, nitrosonium cation, higher oxides of nitrogen, S-nitrosothiols, and dinitrosyl iron complexes. RNS have been recognized as playing a crucial role in the physiologic regulation of many, if not all, living cells, such as smooth muscle cells, cardiomyocytes, platelets, and nervous and juxtaglomerular cells. They possess pleiotropic properties on cellular targets after both posttranslational modifications and interactions with reactive oxygen species. Elevated levels of RNS have been implicated in cell injury and death by inducing nitrosative stress. The aim of this comprehensive review is to address the mechanisms of formation and removal of RNS, highlighting their potential cellular targets: lipids, DNA, and proteins. The specific importance of RNS and their paradoxic effects, depending on their local concentration under physiologic conditions, is underscored. An increasing number of compounds that modulate RNS processing or targets are being identified. Such compounds are now undergoing preclinical and clinical evaluations in the treatment of pathologies associated with RNS-induced cellular damage. Future research should help to elucidate the involvement of RNS in the therapeutic effect of drugs used to treat neurodegenerative, cardiovascular, metabolic, and inflammatory diseases and cancer.
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Affiliation(s)
- M Carmen Martínez
- INSERM, U771, CNRS UMR, 6214, and Université d' Angers, Angers, France
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39
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Cerra MC, Gallo MP, Angelone T, Quintieri AM, Pulerà E, Filice E, Guérold B, Shooshtarizadeh P, Levi R, Ramella R, Brero A, Boero O, Metz-Boutigue MH, Tota B, Alloatti G. The homologous rat chromogranin A1-64 (rCGA1-64) modulates myocardial and coronary function in rat heart to counteract adrenergic stimulation indirectly via endothelium-derived nitric oxide. FASEB J 2008; 22:3992-4004. [PMID: 18697842 DOI: 10.1096/fj.08-110239] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Chromogranin A (CGA), produced by human and rat myocardium, generates several biologically active peptides processed at specific proteolytic cleavage sites. A highly conserved cleavage N-terminal site is the bond 64-65 that reproduces the native rat CGA sequence (rCGA1-64), corresponding to human N-terminal CGA-derived vasostatin-1. rCGA1-64 cardiotropic activity has been explored in rat cardiac preparations. In Langendorff perfused rat heart, rCGA1-64 (from 33 nM) induced negative inotropism and lusitropism as well as coronary dilation, counteracting isoproterenol (Iso) - and endothelin-1 (ET-1) -induced positive inotropic effects and ET-1-dependent coronary constriction. rCGA1-64 also depressed basal and Iso-induced contractility on rat papillary muscles, without affecting calcium transients on isolated ventricular cells. Structure-function analysis using three modified peptides on both rat heart and papillary muscles revealed the disulfide bridge requirement for the cardiotropic action. A decline in Iso intrinsic activity in the presence of the peptides indicates a noncompetitive antagonistic action. Experiments on rat isolated cardiomyocytes and bovine aortic endothelial cells indicate that the negative inotropism observed in rat papillary muscle is probably due to an endothelial phosphatidylinositol 3-kinase-dependent nitric oxide release, rather than to a direct action on cardiomyocytes. Taken together, our data strongly suggest that in the rat heart the homologous rCGA1-64 fragment exerts an autocrine/paracrine modulation of myocardial and coronary performance acting as stabilizer against intense excitatory stimuli.
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Affiliation(s)
- M C Cerra
- B.T., Department of Cell Biology, University of Calabria, 87030 Arcavacata di Rende (CS), Calabria, Italy
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41
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Lee MYK, Tse HF, Siu CW, Zhu SG, Man RYK, Vanhoutte PM. Genomic changes in regenerated porcine coronary arterial endothelial cells. Arterioscler Thromb Vasc Biol 2007; 27:2443-9. [PMID: 17942849 DOI: 10.1161/atvbaha.107.141705] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
OBJECTIVE Genomic changes were defined in cultures of regenerated porcine coronary endothelial cells to explain the alterations that underlie their dysfunction. METHODS AND RESULTS Regeneration of the endothelium was triggered in vivo by endothelial balloon denudation. After 28 days, both left circumflex (native cells) and left anterior descending (regenerated cells) coronary arteries were dissected, their endothelial cells harvested, and primary cultures established. The basal cyclic GMP production was reduced in regenerated cells without significant reduction in the response to bradykinin and A23187. The mRNA expression levels in both native and regenerated cells were measured by microarray and RT-PCR. The comparison revealed genomic changes related to vasomotor control (cyclooxygenase-1, angiotensin II receptor), coagulation (F2 and TFPI), oxidative stress (Mn SOD, GPX3, and GSR), lipid metabolism (PLA2 and HPGD), and extracellular matrix (MMPs). A-FABP and MMP7 were induced by regeneration. RT-PCR revealed upregulation of A-FABP and downregulation of eNOS and TR. The differential gene expression profiles were confirmed at the protein level by Western blotting for eNOS, F2, Mn SOD, MMP7, and TR. CONCLUSIONS Cultures from regenerated coronary endothelial cells exhibit genomic changes explaining endothelial dysfunction and suggesting facilitation of coagulation, lipid peroxidation, and extracellular matrix remodeling.
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Affiliation(s)
- Mary Y K Lee
- Department of Pharmacology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 2F Laboratory Block, 21 Sassoon Road, Pokfulam, Hong Kong
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42
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Bahia L, Aguiar LGK, Villela N, Bottino D, Godoy-Matos AF, Geloneze B, Tambascia M, Bouskela E. Adiponectin is associated with improvement of endothelial function after rosiglitazone treatment in non-diabetic individuals with metabolic syndrome. Atherosclerosis 2007; 195:138-46. [PMID: 17084402 DOI: 10.1016/j.atherosclerosis.2006.09.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2006] [Revised: 08/10/2006] [Accepted: 09/06/2006] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The risks of metabolic syndrome (MetSyn) rely on the interaction between insulin resistance, metabolic abnormalities, inflammation and vascular dysfunction. Insulin sensitizers counteract some of these abnormalities. The objective of this study was to evaluate the effects of rosiglitazone (ROSI) on vascular reactivity, adipokines and inflammatory markers in a group of non-diabetic subjects with MetSyn. METHODS AND RESULTS Thirty subjects with NCEP-ATPIII criteria for MetSyn and eight healthy subjects were studied at baseline and 18 subjects with MetSyn were treated with ROSI 8 mg/day for 24 weeks. Venous occlusion plethysmography exams before and during intra-arterial infusions of acetylcholine and sodium nitroprusside were performed to assess endothelial-dependent and independent vasodilation. Forearm blood flow (FBF) and vascular resistance (VR) responses were analyzed. Treatment with ROSI improved endothelial function (235% increment in FBF; p<0.01 and 56% decrement in VR; p=0.01), adiponectin (7.3[3.6-17.9] versus 37.9[19.3-42.4]; p<0.01), HOMA-IR (3.5+/-1.2 versus 2.7+/-1.6; p<0.05), C-reactive protein (CRP) (1.05[0.57-2.07] versus 0.3[0.2-0.8]; p<0.01) and fibrinogen (3.1+/-0.73 versus 2.62+/-0.64; p<0.05) levels. The difference between groups on endothelial-dependent vasodilation, adiponectin and CRP levels disappeared after treatment and the improvement of endothelial function was associated with the increment of adiponectin levels. CONCLUSION ROSI treatment restored endothelial function in MetSyn subjects, probably through an adiponectin-mediated process.
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Affiliation(s)
- Luciana Bahia
- Laboratório de Pesquisas em Microcirculação (LPM), Department of Physiological Sciences, Institute of Biology Roberto Alcântara Gomes, State University of Rio de Janeiro, Brazil.
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Tessari P, Coracina A, Puricelli L, Vettore M, Cosma A, Millioni R, Cecchet D, Avogaro A, Tiengo A, Kiwanuka E. Acute effect of insulin on nitric oxide synthesis in humans: a precursor-product isotopic study. Am J Physiol Endocrinol Metab 2007; 293:E776-82. [PMID: 17551000 DOI: 10.1152/ajpendo.00481.2006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Nitric oxide (NO) is a key regulatory molecule with wide vascular, cellular, and metabolic effects. Insulin affects NO synthesis in vitro. No data exist on the acute effect of insulin on NO kinetics in vivo. By employing a precursor-product tracer method in humans, we have directly estimated the acute effect of insulin on intravascular NO(x) (i.e., the NO oxidation products) fractional (FSR) and absolute (ASR) synthesis rates in vivo. Nine healthy male volunteers were infused iv with L-[(15)N(2)-guanidino]arginine ([(15)N(2)]arginine) for 6 h. Timed measurements of (15)NO(x) and [(15)N(2)]arginine enrichments in whole blood were performed in the first 3 h in the fasting state and then following a 3-h euglycemic-hyperinsulinemic clamp (with plasma insulin raised to approximately 1,000 pmol/l). In the last 60 min of each experimental period, at approximately steady-state arginine enrichment, a linear increase of (15)NO(x) enrichment (mean r = 0.9) was detected in both experimental periods. In the fasting state, NO(x) FSR was 27.4 +/- 4.3%/day, whereas ASR was 0.97 +/- 0.36 mmol/day, accounting for 0.69 +/- 0.27% of arginine flux. Following hyperinsulinemia, both FSR and ASR of NO(x) increased (FSR by approximately 50%, to 42.4 +/- 6.7%/day, P < 0.005; ASR by approximately 25%, to 1.22 +/- 0.41 mmol/day, P = 0.002), despite a approximately 20-30% decrease of arginine flux and concentration. The fraction of arginine flux used for NO(x) synthesis was doubled, to 1.13 +/- 0.35% (P < 0.003). In conclusion, whole body NO(x) synthesis can be directly measured over a short observation time with stable isotope methods in humans. Insulin acutely stimulates NO(x) synthesis from arginine.
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Affiliation(s)
- Paolo Tessari
- Department of Clinical and Experimental Medicine, Metabolism Division, Policlinico Universitario, via Giustiniani 2, 35128 Padua, Italy.
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Abstract
Insulin has important vascular actions to stimulate production of nitric oxide from endothelium. This leads to capillary recruitment, vasodilation, increased blood flow, and subsequent augmentation of glucose disposal in classical insulin target tissues (e.g., skeletal muscle). Phosphatidylinositol 3-kinase-dependent insulin-signaling pathways regulating endothelial production of nitric oxide share striking parallels with metabolic insulin-signaling pathways. Distinct MAPK-dependent insulin-signaling pathways (largely unrelated to metabolic actions of insulin) regulate secretion of the vasoconstrictor endothelin-1 from endothelium. These and other cardiovascular actions of insulin contribute to coupling metabolic and hemodynamic homeostasis under healthy conditions. Cardiovascular diseases are the leading cause of morbidity and mortality in insulin-resistant individuals. Insulin resistance is typically defined as decreased sensitivity and/or responsiveness to metabolic actions of insulin. This cardinal feature of diabetes, obesity, and dyslipidemia is also a prominent component of hypertension, coronary heart disease, and atherosclerosis that are all characterized by endothelial dysfunction. Conversely, endothelial dysfunction is often present in metabolic diseases. Insulin resistance is characterized by pathway-specific impairment in phosphatidylinositol 3-kinase-dependent signaling that in vascular endothelium contributes to a reciprocal relationship between insulin resistance and endothelial dysfunction. The clinical relevance of this coupling is highlighted by the findings that specific therapeutic interventions targeting insulin resistance often also ameliorate endothelial dysfunction (and vice versa). In this review, we discuss molecular mechanisms underlying cardiovascular actions of insulin, the reciprocal relationships between insulin resistance and endothelial dysfunction, and implications for developing beneficial therapeutic strategies that simultaneously target metabolic and cardiovascular diseases.
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Affiliation(s)
- Ranganath Muniyappa
- Diabetes Unit, National Center for Complementary and Alternative Medicine, National Institutes of Health, Bethesda, Maryland 20892-1632, USA
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McCollum L, Howlett AC, Mukhopadhyay S. Anandamide-mediated CB1/CB2 cannabinoid receptor--independent nitric oxide production in rabbit aortic endothelial cells. J Pharmacol Exp Ther 2007; 321:930-7. [PMID: 17379772 DOI: 10.1124/jpet.106.117549] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We have previously shown that the endocannabinoid anandamide and its metabolically stable analog (R)-methanandamide produce vasorelaxation in rabbit aortic ring preparations in an endothelium-dependent manner that could not be mimicked by other CB(1) cannabinoid receptor agonists (Am J Physiol 282: H2046-H2054, 2002). Here, we show that (R)-methanandamide and abnormal cannabidiol stimulated nitric oxide (NO) production in rabbit aortic endothelial cells (RAEC) in a dose-dependent manner but that other CB(1) and CB(2) receptor agonists, such as cis-3R-[2-hydroxy-4-(1,1-dimethylheptyl)phenyl]-trans-4R-3(3-hydroxypropyl)-1R-cyclohexanol (CP55940) and (R)-(+)-[2,3-dihydro-5-methyl-3-(4-morpholinylmethyl) pyrrolo-[1,2,3-d,e]-1,4-benzoxazin-6-yl]-1-naphthalenyl-methanone (WIN55212-2), failed to do so. CB(1) antagonists rimonabant [also known as SR141716; N-piperidin-1-yl)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide] and 6-methoxy-2-(4-methoxyphenyl)benzo[b]-thien-3-yl][4-cyanophenyl]methanone (LY320135) and CB(2) antagonist N-[(1S)-endo-1,3,3,-trimethylbicyclo[2.2.1]heptan-2-yl]-5-(4-chloro-3-methylphenyl)-1-(4-methylbenzyl)-pyrazole-3-carboxamide (SR144528) failed to block (R)-methanandamide-mediated NO production in RAEC. However, anandamide receptor antagonist (-)-4-(3-3,4-trans-p-menthadien-(1,8)-yl)-orcinol (O-1918) blocked (R)-methanandamide-mediated NO production in RAEC. Reverse transcriptase-polymerase chain reaction and Western blot analyses failed to detect the CB(1) receptor in RAEC, making this a good model to study non-CB(1) responses to anandamide. (R)-Methanandamide produced endothelial nitric-oxide synthase (eNOS) phosphorylation via the activation of phosphoinositide 3-kinase-Akt signaling. Inhibition of G(i) signaling with pertussis toxin, or phosphatidylinositol 3-kinase activity with 2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one (LY294002), resulted in a decrease in (R)-methanandamide-induced Akt phosphorylation and NO production. Results from this study suggest that in RAEC, (R)-methanandamide acts on a novel non-CB(1) and non-CB(2) anandamide receptor and signals through G(i) and phosphatidylinositol 3-kinase, leading to Akt activation, eNOS phosphorylation, and NO production.
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MESH Headings
- Animals
- Arachidonic Acids/pharmacology
- Benzofurans/pharmacology
- Benzoxazines/pharmacology
- Camphanes/pharmacology
- Cannabinoid Receptor Modulators/pharmacology
- Cells, Cultured
- Chromones/pharmacology
- Cyclohexanols/pharmacology
- Dose-Response Relationship, Drug
- Endocannabinoids
- Endothelial Cells/cytology
- Endothelial Cells/drug effects
- Endothelial Cells/metabolism
- Enzyme Inhibitors/pharmacology
- GTP-Binding Protein alpha Subunits, Gi-Go/antagonists & inhibitors
- Morpholines/pharmacology
- Naphthalenes/pharmacology
- Nitric Oxide/metabolism
- Pertussis Toxin/pharmacology
- Phosphoinositide-3 Kinase Inhibitors
- Phosphorylation/drug effects
- Piperidines/pharmacology
- Polyunsaturated Alkamides/pharmacology
- Proto-Oncogene Proteins c-akt/metabolism
- Pyrazoles/pharmacology
- Rabbits
- Receptor, Cannabinoid, CB1/agonists
- Receptor, Cannabinoid, CB1/antagonists & inhibitors
- Receptor, Cannabinoid, CB1/physiology
- Receptor, Cannabinoid, CB2/agonists
- Receptor, Cannabinoid, CB2/antagonists & inhibitors
- Receptor, Cannabinoid, CB2/physiology
- Resorcinols/pharmacology
- Rimonabant
- Signal Transduction/drug effects
- Signal Transduction/physiology
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Affiliation(s)
- LaTronya McCollum
- Neuroscience of Drug Abuse Research Program, J. L. Chambers Biomedical/Biotechnology Research Institute, North Carolina Central University, 700 George St., Durham, NC 27707, USA
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46
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Abstract
Admission hyperglycemia complicates approximately one-third of acute ischemic strokes and is associated with a worse clinical outcome. Both human and animal studies have showed that hyperglycemia is particularly detrimental in ischemia/reperfusion. Decreased reperfusion blood flow has been observed after middle cerebral artery occlusion in acutely hyperglycemic animals, suggesting the vasculature as an important site of hyperglycemic reperfusion injury. This paper reviews biochemical and molecular pathways in the vasculature that are rapidly affected by hyperglycemia and concludes that these changes result in a pro-vasoconstrictive, pro-thrombotic and pro-inflammatory phenotype that renders the vasculature vulnerable to reperfusion injury. Understanding these pathways should lead to the development of rational therapies that reduce hyperglycemic reperfusion injury and thus improve outcome in this large subset of acute ischemic stroke patients.
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Affiliation(s)
- Sharyl R Martini
- Department of Neurology, Baylor College of Medicine and the Michael E DeBakey Veterans Affairs Medical Center Stroke Program, Houston, TX 77030, USA
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47
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Gallo MP, Levi R, Ramella R, Brero A, Boero O, Tota B, Alloatti G. Endothelium-derived nitric oxide mediates the antiadrenergic effect of human vasostatin-1 in rat ventricular myocardium. Am J Physiol Heart Circ Physiol 2007; 292:H2906-12. [PMID: 17293489 DOI: 10.1152/ajpheart.01253.2006] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Vasostatins (VSs) are vasoactive peptides derived from chromogranin A (CgA), a protein contained in secretory granules of chromaffin and other cells. The negative inotropic effect and the reduction of isoproterenol (Iso)-dependent inotropism induced by VSs in the heart suggest that they have an antiadrenergic function. However, further investigation of the mechanisms of action of VSs is needed. The aim of the present study was to define the signaling pathways activated by VS-1 in mammalian ventricular myocardium and cultured endothelial cells that lead to the modulation of cardiac contractility. Ca(2+) and nitric oxide (NO) fluorometric confocal imaging was used to study the effects induced by recombinant human VS-1 [STA-CgA-(1-76)] on contractile force, L-type Ca(2+) current, and Ca(2+) transients under basal conditions and after beta-adrenergic stimulation in rat papillary muscles and ventricular cells and the effects on intracellular Ca(2+) concentration and NO production in cultured bovine aortic endothelial (BAE-1) cells. VS-1 had no effect on basal contractility of papillary muscle, but the effect of Iso stimulation was reduced by 27%. Removal of endocardial endothelium and inhibition of NO synthesis and phosphatidylinositol 3-kinase (PI3K) activity abolished the antiadrenergic effect of VS-1 on papillary muscle. In cardiomyocytes, 10 nM VS-1 was ineffective on basal and Iso (1 microM)-stimulated L-type Ca(2+) current and Ca(2+) transients. In BAE-1 cells, VS-1 induced a Ca(2+)-independent increase in NO production that was blocked by the PI3K inhibitor wortmannin. Our results suggest that the antiadrenergic effect of VS-1 is mainly due to a PI3K-dependent NO release by endothelial cells, rather than a direct action on cardiomyocytes.
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Affiliation(s)
- Maria Pia Gallo
- Dipartimento di Biologia Animale e dell'Uomo, Università di Torino, Italy
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48
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Viardot A, Grey ST, Mackay F, Chisholm D. Potential antiinflammatory role of insulin via the preferential polarization of effector T cells toward a T helper 2 phenotype. Endocrinology 2007; 148:346-53. [PMID: 17008395 DOI: 10.1210/en.2006-0686] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Hyperglycemia in critical illness is a common complication and a strong independent risk factor for morbidity and death. Intensive insulin therapy decreases this risk by up to 50%. It is unclear to what extent this benefit is due to reversal of glucotoxicity or to a direct effect of insulin, because antiinflammatory effects of insulin have already been described, but the underlying mechanisms are still poorly understood. The insulin receptor is expressed on resting neutrophils, monocytes, and B cells, but is not detectable on T cells. However, significant up-regulation of insulin receptor expression is observed on activated T cells, which suggests an important role during T cell activation. Exogenous insulin in vitro induced a shift in T cell differentiation toward a T helper type 2 (Th2)-type response, decreasing the T helper type 1 to Th2 ratio by 36%. This result correlated with a corresponding change in cytokine secretion, with the interferon-gamma to IL-4 ratio being decreased by 33%. These changes were associated with increased Th2-promoting ERK phosphorylation in the presence of insulin. Thus, we demonstrate for the first time that insulin treatment influences T cell differentiation promoting a shift toward a Th2-type response. This effect of insulin in changing T cell polarization may contribute to its antiinflammatory role not only in sepsis, but also in chronic inflammation associated with obesity and type 2 diabetes.
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Affiliation(s)
- Alexander Viardot
- Diabetes and Obesity Research Program, Garvan Institute of Medical Research, Sydney-Darlinghurst, New South Wales 2010, Australia.
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49
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Canabal DD, Song Z, Potian JG, Beuve A, McArdle JJ, Routh VH. Glucose, insulin, and leptin signaling pathways modulate nitric oxide synthesis in glucose-inhibited neurons in the ventromedial hypothalamus. Am J Physiol Regul Integr Comp Physiol 2006; 292:R1418-28. [PMID: 17170237 DOI: 10.1152/ajpregu.00216.2006] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Glucose-sensing neurons in the ventromedial hypothalamus (VMH) are involved in the regulation of glucose homeostasis. Glucose-sensing neurons alter their action potential frequency in response to physiological changes in extracellular glucose, insulin, and leptin. Glucose-excited neurons decrease, whereas glucose-inhibited (GI) neurons increase, their action potential frequency when extracellular glucose is reduced. Central nitric oxide (NO) synthesis is regulated by changes in local fuel availability, as well as insulin and leptin. NO is involved in the regulation of food intake and is altered in obesity and diabetes. Thus this study tests the hypothesis that NO synthesis is a site of convergence for glucose, leptin, and insulin signaling in VMH glucose-sensing neurons. With the use of the NO-sensitive dye 4-amino-5-methylamino-2',7'-difluorofluorescein in conjunction with the membrane potential-sensitive dye fluorometric imaging plate reader, we found that glucose and leptin suppress, whereas insulin stimulates neuronal nitric oxide synthase (nNOS)-dependent NO production in cultured VMH GI neurons. The effects of glucose and leptin were mediated by suppression of AMP-activated protein kinase (AMPK). The AMPK activator 5-aminoimidazole-4-carboxamide-1-beta-4-ribofuranoside (AICAR) increased both NO production and neuronal activity in GI neurons. In contrast, the effects of insulin on NO production were blocked by the phosphoinositide 3-kinase inhibitors wortmannin and LY-294002. Furthermore, decreased glucose, insulin, and AICAR increase the phosphorylation of VMH nNOS, whereas leptin decreases it. Finally, VMH neurons express soluble guanylyl cyclase, a downstream mediator of NO signaling. Thus NO may mediate, in part, glucose, leptin, and insulin signaling in VMH glucose-sensing neurons.
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Affiliation(s)
- Debra D Canabal
- Department of Pharmacology amd Physiology, New Jersey Medical School, 185 S. Orange Ave., PO Box 1709, Newark, NJ 07101-1709, USA
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50
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Wu BN, Chen IC, Lin RJ, Chiu CC, An LM, Chen IJ. Aortic smooth muscle relaxants KMUP-3 and KMUP-4, two nitrophenylpiperazine derivatives of xanthine, display cGMP-enhancing activity: roles of endothelium, phosphodiesterase, and K+ channel. J Cardiovasc Pharmacol 2006; 46:600-8. [PMID: 16220066 DOI: 10.1097/01.fjc.0000180900.32489.f9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The cellular mechanisms of vasorelaxant effects of newly synthesized KMUP-3 and KMUP-4 were investigated in rat aortic smooth muscle (RASM). KMUP-3 (7-[2-[4-(4-nitrobenzene)piperazinyl]ethyl]-1,3-dimethylxanthine) and KMUP-4 (7-[2-[4-(2-nitrobenzene)piperazinyl]ethyl]-1,3-dimethylxanthine) elicited concentration-dependent relaxation of endothelium-intact and denuded RASM precontracted with phenylephrine. Relaxant responses were also produced by the PDE inhibitors theophylline, milrinone, rolipram, and zaprinast (1 nM-100 microM). The relaxant responses of KMUP-3 and KMUP-4 were reduced by endothelium removal and by the presence of the NOS inhibitor L-NAME (100 microM), the sGC inhibitor ODQ (1 microM), the adenylyl cyclase (AC) inhibitor SQ 22536 (100 microM), and the prostaglandin inhibitor indomethacin (10 microM). Additionally, the vasorelaxations of both agents were also attenuated by pretreatment with the nonselective K+ channel blocker TEA (10 mM), the KATP channel blocker glibenclamide (1 microM), the voltage-dependent K+ (KV) channel blocker 4-AP (100 microM), and Ca(2+)-dependent K+ (KCa) channel blockers apamin (1 microM) and charybdotoxin (ChTX, 0.1 microM). In addition, elevated extracellular K+ (80 mM) interferes with KMUP-3- and KMUP-4-induced vasorelaxations. Preincubation with both agents (1 microM) significantly enhanced the dilator responses of isoproterenol and SNP. KMUP-3 and KMUP-4 inhibited PDE activities and increased cAMP and cGMP levels in primary culture of RASM that were inhibited by SQ 22536 and ODQ, respectively. In cultured HUVECs, KMUP-3 and KMUP-4 (0.1 microM), more potent than YC-1, significantly increased the expression of eNOS protein. In summary, KMUP-3 and KMUP-4 induce aortic relaxations through both endothelium-dependent and -independent mechanisms. Mechanisms of vasorelaxation induced by both compounds involve multiple processes, such as accumulation of cyclic nucleotides partly as a result of PDE inhibition, K-channel activation, and indomethacin-sensitive endothelium function.
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MESH Headings
- Animals
- Aorta
- Cell Line
- Cyclic AMP/metabolism
- Cyclic GMP/metabolism
- Endothelium, Vascular/physiology
- In Vitro Techniques
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/metabolism
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/enzymology
- Myocytes, Smooth Muscle/metabolism
- Phosphoric Diester Hydrolases/metabolism
- Piperazines/chemistry
- Piperazines/pharmacology
- Piperidines/chemistry
- Piperidines/pharmacology
- Potassium Channels/metabolism
- Rats
- Rats, Wistar
- Vasoconstrictor Agents/pharmacology
- Vasodilator Agents/chemistry
- Vasodilator Agents/pharmacology
- Xanthines/chemistry
- Xanthines/pharmacology
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Affiliation(s)
- Bin-Nan Wu
- Department and Graduate Institute of Pharmacology, College of Medicine, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan
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