1
|
Sutar RR, Mapari SV, Gaikwad SB, Khare R, Behera BC. An investigation on the cardioprotective potential of lichen compound protocetraric acid by H 2O 2-induced toxicity in H9c2 rat heart cells through in vitro and in silico analysis. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2024:10.1007/s00210-024-03390-3. [PMID: 39172149 DOI: 10.1007/s00210-024-03390-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 07/08/2024] [Accepted: 08/16/2024] [Indexed: 08/23/2024]
Abstract
Worldwide, cardiovascular diseases (CVDs) are the leading cause of death and require treatment and prevention. Lichens are symbiotic organisms that are known to produce unique secondary metabolites and have been used as folk medicines. The aim of the study is to emphasize the importance of lichens in improving heart health, with the objective of investigating protocetraric acid, a lichen metabolite, for its antioxidant and cardioprotective potential by using in vitro and in silico techniques. Protocetraric acid (PRC) was isolated, characterized, and tested for antioxidant properties using six assays. In cardiovascular investigations, hydroxymethylglutaryl-coenzymeA reductase (HMGCR), angiotensin-converting enzyme inhibitory, and fibrinolytic capacities, along with enzyme inhibitory kinetics studies, were carried out. In silico toxicology and molecular docking analysis were done to determine the binding sites on target proteins. The cytoprotective ability of PRC was evaluated by H2O2-induced toxicity in H9c2 rat heart cells. Out of six lichens, the extract of F. caperata showed comparatively stronger antioxidant activity in terms of 1,1-diphenyl-2-picryl hydrazil (DPPH), scavenging of nitric oxide (SNO), and ferric reducing potential (FRAP) equivalent values. PRC showed significant antioxidant properties, and with respect to cardiovascular studies, PRC exhibited 86% HMGCR and 82% ACE inhibition, while 57% fibrinolysis at 320 µM concentration. Inhibitory kinetic tests of PRC showed competitive and uncompetitive HMGCR and ACE inhibition types respectively. PRC showed minimum binding energies of - 7.9, - 8.9, and - 9.0 kcal/mol with 1HWK, 1O8A, and 4BZS. The H9c2 cell line pre-treated with PRC was found to reduce H2O2 toxicity as well as increase cell viability. Protocetraric acid is a potent compound that has been experimentally shown to have hypocholesterolemic, hypotensive, and cardioprotective properties for treating cardiovascular diseases.
Collapse
Affiliation(s)
- Ruchira R Sutar
- Biodiversity-Lichen, Agharkar Research Institute, Pune, Maharashtra, India
- Savitribai Phule Pune University, Pune, Maharashtra, India
| | - Sachin V Mapari
- Biodiversity-Lichen, Agharkar Research Institute, Pune, Maharashtra, India
- Savitribai Phule Pune University, Pune, Maharashtra, India
| | - Subhash B Gaikwad
- Biodiversity-Lichen, Agharkar Research Institute, Pune, Maharashtra, India
- Savitribai Phule Pune University, Pune, Maharashtra, India
| | - Roshni Khare
- Biodiversity-Lichen, Agharkar Research Institute, Pune, Maharashtra, India
| | - Bhaskar C Behera
- Biodiversity-Lichen, Agharkar Research Institute, Pune, Maharashtra, India.
| |
Collapse
|
2
|
Ong WY, Satish RL, Herr DR. ACE2, Circumventricular Organs and the Hypothalamus, and COVID-19. Neuromolecular Med 2022; 24:363-373. [PMID: 35451691 PMCID: PMC9023728 DOI: 10.1007/s12017-022-08706-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/01/2022] [Indexed: 12/29/2022]
Abstract
The SARS-CoV-2 virus gains entry to cells by binding to angiotensin-converting enzyme 2 (ACE2). Since circumventricular organs and parts of the hypothalamus lack a blood-brain barrier, and immunohistochemical studies demonstrate that ACE2 is highly expressed in circumventricular organs which are intimately connected to the hypothalamus, and the hypothalamus itself, these might be easy entry points for SARS-CoV-2 into the brain via the circulation. High ACE2 protein expression is found in the subfornical organ, area postrema, and the paraventricular nucleus of the hypothalamus (PVH). The subfornical organ and PVH are parts of a circuit to regulate osmolarity in the blood, through the secretion of anti-diuretic hormone into the posterior pituitary. The PVH is also the stress response centre in the brain. It controls not only pre-ganglionic sympathetic neurons, but is also a source of corticotropin-releasing hormone, that induces the secretion of adrenocorticotropic hormone from the anterior pituitary. It is proposed that the function of ACE2 in the circumventricular organs and the PVH could be diminished by binding with SARS-CoV-2, thus leading to a reduction in the ACE2/Ang (1-7)/Mas receptor (MasR) signalling axis, that modulates ACE/Ang II/AT1R signalling. This could result in increased presympathetic activity/neuroendocrine secretion from the PVH, and effects on the hypothalamic-pituitary-adrenal axis activity. Besides the bloodstream, the hypothalamus might also be affected by SARS-CoV-2 via transneuronal spread along the olfactory/limbic pathways. Exploring potential therapeutic pathways to prevent or attenuate neurological symptoms of COVID-19, including drugs which modulate ACE signalling, remains an important area of unmet medical need.
Collapse
Affiliation(s)
- Wei-Yi Ong
- Department of Anatomy, National University of Singapore, Singapore, 119260, Singapore.
- Neurobiology Research Programme, Life Sciences Institute, National University of Singapore, Singapore, 119260, Singapore.
| | - R L Satish
- Department of Anatomy, National University of Singapore, Singapore, 119260, Singapore
| | - Deron R Herr
- Department of Pharmacology, National University of Singapore, Singapore, 119260, Singapore
| |
Collapse
|
3
|
Raquel HA, Manica LA, Ceroni A, Michelini LC. Exercise training improves cardiovascular control in sinoaortic denervated SHR by reducing the elevated angiotensin II and augmenting angiotensin-(1-7) availability within autonomic and neuroendocrine PVN nuclei. Peptides 2022; 153:170798. [PMID: 35405300 DOI: 10.1016/j.peptides.2022.170798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 04/05/2022] [Accepted: 04/07/2022] [Indexed: 11/18/2022]
Abstract
Previous studies have shown that baroreceptors- and chemoreceptors-denervated SHR exhibit impaired central autonomic circuitry and worsening of the cardiovascular function. It was also known that exercise training (T) ameliorates the autonomic control of the circulation. In the present study we sought to investigate whether sinoaortic denervation (SAD) is able to modify the expression/activity of the renin-angiotensin system (RAS) within brain autonomic areas and the effects induced by T. SHR submitted to SAD or SHAM surgery were trained or kept sedentary (S) for 8 weeks. Femoral artery and vein were chronically cannulated for hemodynamic/autonomic recordings and baroreflex testing (phenylephrine and sodium nitroprusside, i.v). Ang II and Ang (1-7) protein expression (immunofluorescence assays) were quantified within autonomic and neuroendocrine nuclei of the hypothalamic paraventricular nucleus (PVN). SAD-S vs. SHAM-S exhibited large increase in Ang II availability into the ventromedial, dorsal cap and magnocellular PVN nuclei, which are accompanied by augmented sympathetic activity, elevated arterial pressure variability and higher MAP. There was no change in Ang-(1-7) content within these nuclei. In contrast, T largely augmented Ang-(1-7) immunofluorescence in all nuclei, reduced and normalized Ang II availability and ameliorated the autonomic control of the circulation in SAD rats, but did not reduce MAP levels. Data showed that tonic baroreceptors and chemoreceptors' activity is essential to maintain lower Ang II levels within PVN nuclei. In the absence of afferent signaling, exercise training is still efficient to alter Ang II/Ang-(1-7) balance thus improving cardiovascular control even in the presence of high-pressure levels.
Collapse
Affiliation(s)
- Hiviny A Raquel
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo/SP, Brazil.
| | - Louisi A Manica
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo/SP, Brazil
| | - Alexandre Ceroni
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo/SP, Brazil
| | - Lisete C Michelini
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo/SP, Brazil
| |
Collapse
|
4
|
Anjos PAR, Marchette RCN, Kremer R, Granzotto N, Alves TM, Fadanni GP, Mazur FG, Anton EL, da Silva-Santos JE, Linder ÁE, Izídio GS. The influence of chromosome 4 on high ethanol consumption and blood pressure. Alcohol 2022; 102:1-10. [PMID: 35500756 DOI: 10.1016/j.alcohol.2022.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 04/06/2022] [Accepted: 04/18/2022] [Indexed: 11/16/2022]
Abstract
The Spontaneously Hypertensive Rats (SHR) strain was developed through selective breeding for high systolic blood pressure. In our laboratory, we established a congenic rat strain named SHR.Lewis-Anxrr16 (SLA16). The SLA16 rat strain is genetically identical to the SHR except for the inserted Anxrr16 region in chromosome 4. Our objective was to evaluate the influence of this genomic region on ethanol consumption and blood pressure. First, we exposed SHR and SLA16 male and female rats to ethanol consumption. Results showed that, regardless of strain, females consumed more ethanol than males during forced (10% v/v) and spontaneous ethanol consumption (SEC; 2.5-20% v/v). Then, females from both strains were used to evaluate sensitivity to ethanol. No strain differences in the loss of righting reflex were observed after ethanol treatment (3 g/kg, 20% w/v, intraperitoneal [i.p.]). But, in the triple test, female SHR rats presented lower sensitivity to the ethanol (1.2 g/kg, 14% w/v, i.p.). Surprisingly, female SHR rats also presented higher blood pressure after SEC (10% v/v). Finally, losartan treatment was effective in decreasing the blood pressure of female rats of both strains, but had specific effects on SHR ethanol consumption. Our data suggest that SLA16 female rats consume less ethanol (10%), are more sensitive to its effects, and present lower blood pressure than SHR female rats. We demonstrated that the Anxrr16 locus in chromosome 4 is a genetic candidate to explain high ethanol consumption and blood pressure, at least in females.
Collapse
Affiliation(s)
| | - Renata Cristina Nunes Marchette
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Neurobiology of Addiction Section, Integrative Neuroscience Branch, National Institute on Drug Abuse Intramural Program, Baltimore, MD, United States
| | - Rafael Kremer
- Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Department of Medicine - Federal University of Fronteira Sul, Passo Fundo, Rio Grande do Sul, Brazil
| | - Natalli Granzotto
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Thalita Mello Alves
- Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Guilherme Pasetto Fadanni
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Fernando Gabriel Mazur
- Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Elaine Leocádia Anton
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | | | - Áurea Elizabeth Linder
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Geison Souza Izídio
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
| |
Collapse
|
5
|
Rossetti CL, Cazarin J, Hecht F, Beltrão FEDL, Ferreira ACF, Fortunato RS, Ramos HE, de Carvalho DP. COVID-19 and thyroid function: What do we know so far? Front Endocrinol (Lausanne) 2022; 13:1041676. [PMID: 36601011 PMCID: PMC9806267 DOI: 10.3389/fendo.2022.1041676] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Coronavirus disease 2019 (COVID-19) was characterized as a pandemic in March, 2020 by the World Health Organization. COVID-19 is a respiratory syndrome that can progress to acute respiratory distress syndrome, multiorgan dysfunction, and eventually death. Despite being considered a respiratory disease, it is known that other organs and systems can be affected in COVID-19, including the thyroid gland. Thyroid gland, as well as hypothalamus and pituitary, which regulate the functioning of most endocrine glands, express angiotensin-converting enzyme 2 (ACE2), the main protein that functions as a receptor to which SARS-CoV-2 binds to enter host cells. In addition, thyroid gland is extremely sensitive to changes in body homeostasis and metabolism. Immune system cells are targets for thyroid hormones and T3 and T4 modulate specific immune responses, including cell-mediated immunity, natural killer cell activity, the antiviral action of interferon (IFN) and proliferation of T- and B-lymphocytes. However, studies show that patients with controlled hypothyroidism and hyperthyroidism do not have a higher prevalence of COVID-19, nor do they have a worse prognosis when infected with the virus. On the other hand, retrospective observational studies, prospective studies, and case reports published in the last two years reported abnormal thyroid function related to acute SARS-CoV-2 infection or even several weeks after its resolution. Indeed, a variety of thyroid disorders have been documented in COVID-19 patients, including non-thyroidal illness syndrome (NTIS), subacute thyroiditis and thyrotoxicosis. In addition, thyroid disease has already been reported as a consequence of the administration of vaccines against SARS-CoV-2. Overall, the data revealed that abnormal thyroid function may occur during and in the convalescence post-COVID condition phase. Although the cellular and molecular mechanisms are not completely understood, the evidence suggests that the "cytokine storm" is an important mediator in this context. Thus, future studies are needed to better investigate the pathophysiology of thyroid dysfunction induced by COVID-19 at both molecular and clinical levels.
Collapse
Affiliation(s)
- Camila Lüdke Rossetti
- Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Juliana Cazarin
- Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fabio Hecht
- Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fabyan Esberard de Lima Beltrão
- Postgraduate Program in Nutritional Sciences, Department of Nutrition, Center for Health Sciences, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Andrea Cláudia Freitas Ferreira
- Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Campus Duque de Caxias Professor Geraldo Cidade, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rodrigo Soares Fortunato
- Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Helton Estrela Ramos
- Department of Biorregulation, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Brazil
- *Correspondence: Helton Estrela Ramos,
| | - Denise Pires de Carvalho
- Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| |
Collapse
|
6
|
Mussa BM, Srivastava A, Verberne AJM. COVID-19 and Neurological Impairment: Hypothalamic Circuits and Beyond. Viruses 2021; 13:v13030498. [PMID: 33802995 PMCID: PMC8002703 DOI: 10.3390/v13030498] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 02/15/2021] [Accepted: 02/26/2021] [Indexed: 12/23/2022] Open
Abstract
In December 2019, a novel coronavirus known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emerged in Wuhan, the capital of Hubei, China. The virus infection, coronavirus disease 2019 (COVID-19), represents a global concern, as almost all countries around the world are affected. Clinical reports have confirmed several neurological manifestations in COVID-19 patients such as headaches, vomiting, and nausea, indicating the involvement of the central nervous system (CNS) and peripheral nervous system (PNS). Neuroinvasion of coronaviruses is not a new phenomenon, as it has been demonstrated by previous autopsies of severe acute respiratory syndrome coronavirus (SARS-CoV) patients who experienced similar neurologic symptoms. The hypothalamus is a complex structure that is composed of many nuclei and diverse neuronal cell groups. It is characterized by intricate intrahypothalamic circuits that orchestrate a finely tuned communication within the CNS and with the PNS. Hypothalamic circuits are critical for maintaining homeostatic challenges including immune responses to viral infections. The present article reviews the possible routes and mechanisms of neuroinvasion of SARS-CoV-2, with a specific focus on the role of the hypothalamic circuits in mediating the neurological symptoms noted during COVID-19 infection.
Collapse
Affiliation(s)
- Bashair M. Mussa
- Basic Medical Science Department, College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates
- Correspondence: ; Tel.: +971-65057220
| | - Ankita Srivastava
- Sharjah Institute for Medical Research and College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates;
| | - Anthony J. M. Verberne
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg 3084, Australia;
| |
Collapse
|
7
|
Stein RA, Young LM. From ACE2 to COVID-19: A multiorgan endothelial disease. Int J Infect Dis 2020; 100:425-430. [PMID: 32896660 PMCID: PMC7832810 DOI: 10.1016/j.ijid.2020.08.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 08/31/2020] [Indexed: 02/06/2023] Open
Affiliation(s)
- Richard A Stein
- NYU Tandon School of Engineering, Department of Chemical and Biomolecular Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA; LaGuardia Community College, Department of Natural Sciences, City University of New York, New York, NY 11101, USA.
| | - Lauren M Young
- University of Chicago, Department of Internal Medicine, 5841 S Maryland Ave, Chicago, IL 60637, USA.
| |
Collapse
|
8
|
Paes-Leme B, Dos-Santos RC, Mecawi AS, Ferguson AV. Interaction between angiotensin II and glucose sensing at the subfornical organ. J Neuroendocrinol 2018; 30:e12654. [PMID: 30365188 DOI: 10.1111/jne.12654] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 09/14/2018] [Accepted: 10/22/2018] [Indexed: 02/06/2023]
Abstract
The subfornical organ (SFO) lacks the normal blood-brain barrier and senses the concentrations of many different circulating signals, including glucose and angiotensin II (ANG II). ANG II has recently been implicated in the control of food intake and body weight gain. The present study assessed whether single SFO neurones sense changes in glucose and ANG II, and also whether changes in glucose concentration alter the responsiveness of these neurones to ANG II. SFO neurones dissociated from male Sprague-Dawley rats (100-175 g) were used. We first examined whether glucose concentration modulates AT1 receptor expression. Similar AT1a mRNA expression levels were found at glucose concentrations of 1, 5 and 10 mmol L-1 in dissociated SFO neurones. Glucose responsiveness of SFO neurones was assessed using perforated current-clamp recordings and switching between 5 and 10 mmol L-1 glucose artificial cerebrospinal fluid to classify single neurones as nonresponsive (nGS), glucose-excited (GE) or glucose-inhibited (GI). In total, 26.7% of the SFO neurones were GI (n = 24 of 90), 21.1% were GE (n = 19 of 90) and 52.2% were nGS (n = 47 of 90). Once classified, the effects of 10 nmol L-1 ANG II on the excitability of these neurones were tested, with 52% of GE (n = 10 of 19), 71% of GI (n = 17 of 24) and 43% of nGS (n = 20 of 47) neurones being ANG II sensitive. Finally, we tested whether acute changes in glucose concentration modified the response to ANG II and showed that some neurones (4/17) only respond to ANG II at 10 mmol L-1 glucose. Our data demonstrate that the same SFO neurone can sense glucose and ANG II and that acute changes in glucose concentration may change ANG II responsiveness.
Collapse
Affiliation(s)
- Bruno Paes-Leme
- Department of Physiological Sciences, Federal Rural University of Rio de Janeiro, Seropédica, Brazil
| | - Raoni C Dos-Santos
- Department of Physiological Sciences, Federal Rural University of Rio de Janeiro, Seropédica, Brazil
| | - André S Mecawi
- Department of Physiological Sciences, Federal Rural University of Rio de Janeiro, Seropédica, Brazil
- Department of Biophysics, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - Alastair V Ferguson
- Centre for Neurosciences Studies, Queen's University, Kingston, Ontario, Canada
| |
Collapse
|
9
|
Haspula D, Clark MA. Molecular Basis of the Brain Renin Angiotensin System in Cardiovascular and Neurologic Disorders: Uncovering a Key Role for the Astroglial Angiotensin Type 1 Receptor AT1R. J Pharmacol Exp Ther 2018; 366:251-264. [PMID: 29752427 DOI: 10.1124/jpet.118.248831] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/08/2018] [Indexed: 12/13/2022] Open
Abstract
The central renin angiotensin system (RAS) is one of the most widely investigated cardiovascular systems in the brain. It is implicated in a myriad of cardiovascular diseases. However, studies from the last decade have identified its involvement in several neurologic abnormalities. Understanding the molecular functionality of the various RAS components can thus provide considerable insight into the phenotypic differences and mechanistic drivers of not just cardiovascular but also neurologic disorders. Since activation of one of its primary receptors, the angiotensin type 1 receptor (AT1R), results in an augmentation of oxidative stress and inflammatory cytokines, it becomes essential to investigate not just neuronal RAS but glial RAS as well. Glial cells are key homeostatic regulators in the brain and are critical players in the resolution of overt oxidative stress and neuroinflammation. Designing better and effective therapeutic strategies that target the brain RAS could well hinge on understanding the molecular basis of both neuronal and glial RAS. This review provides a comprehensive overview of the major studies that have investigated the mechanisms and regulation of the brain RAS, and it also provides insight into the potential role of glial AT1Rs in the pathophysiology of cardiovascular and neurologic disorders.
Collapse
Affiliation(s)
- Dhanush Haspula
- Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin (D.H.); and College of Pharmacy, Department of Pharmaceutical Sciences, Nova Southeastern University, Ft. Lauderdale, Florida (M.A.C.)
| | - Michelle A Clark
- Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin (D.H.); and College of Pharmacy, Department of Pharmaceutical Sciences, Nova Southeastern University, Ft. Lauderdale, Florida (M.A.C.)
| |
Collapse
|
10
|
Divergent profile between hypothalamic and plasmatic aminopeptidase activities in WKY and SHR. Influence of beta-adrenergic blockade. Life Sci 2017; 192:9-17. [PMID: 29155297 DOI: 10.1016/j.lfs.2017.11.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 11/06/2017] [Accepted: 11/15/2017] [Indexed: 11/20/2022]
Abstract
AIMS Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR) differ in their renin-angiotensin system function and sympathetic tone. The metabolism of angiotensins and vasopressin depends on the action of certain aminopeptidases whose activity may be influenced by the autonomic nervous system. Their regulation may differ between WKY and SHR in hypothalamus and plasma according to the sympathetic tone. We analyzed aminopeptidases responsible for the hydrolysis of certain angiotensins, vasopressin, cholecystokinin or enkephalins in hypothalamus and plasma of WKY and SHR in untreated controls rats and under beta-adrenoceptor blockade. Systolic blood pressure, food intake, water intake and diuresis were measured as parameters modulated by the autonomic nervous system and the above mentioned peptides. MAIN METHODS Glutamyl-, aspartyl-, cystinyl- and alanyl-aminopeptidase activities were analyzed fluorimetrically in plasma and hypothalamus of control and propranolol-treated (100mg/kg/day administered in drinking water for 1month) WKY and SHR, using arylamide derivatives as substrates. KEY FINDINGS An opposite response of aminopeptidases to propranolol treatment between plasma and hypothalamus was observed in either WKY and SHR. Furthermore, the behavior of aminopeptidases was inversed between WKY and SHR either in hypothalamus and plasma: while the activity increased in hypothalamus and decreased in plasma of WKY, it decreased in hypothalamus and increased in plasma of SHR. SIGNIFICANCE These results revealed an inverse response of aminopeptidases between hypothalamus and plasma and also an opposite behavior of these enzymes between WKY and SHR in hypothalamus and plasma. These observations support the involvement of the sympathetic system in the modulation of aminopeptidase activities.
Collapse
|
11
|
The sirtuin 6 prevents angiotensin II-mediated myocardial fibrosis and injury by targeting AMPK-ACE2 signaling. Oncotarget 2017; 8:72302-72314. [PMID: 29069788 PMCID: PMC5641131 DOI: 10.18632/oncotarget.20305] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 07/26/2017] [Indexed: 12/20/2022] Open
Abstract
Sirtuin 6 (SIRT6) is an important modulator of cardiovascular functions in health and diseases. However, the exact role of SIRT6 in heart disease is poorly defined. We hypothesized that SIRT6 is a negative regulator of angiotensin II (Ang II)-mediated myocardial remodeling, fibrosis and injury. The male Sprague-Dawley rats were randomized to Ang II (200 ng/kg/min) infusion with an osmotic minipump and pretreated with recombinant plasmids adeno-associated viral vector (AAV)-SIRT6 (pAAV-SIRT6) or pAAV-GFP for 4 weeks. Ang II triggered downregulated levels of SIRT6 and angiotensin-converting enzyme 2 (ACE2) and upregulated expression of connective tissue growth factor (CTGF) and proinflammatory chemokine fractalkine (FKN), contributing to enhanced cardiac fibrosis and ultrastructural injury. Reduced levels of phosphorylated pAMPK-α, increased myocardial hypertrophy and impaired heart dysfunction were observed in both Ang II-induced hypertensive rats and ACE2 knockout rats, characterized with increases in heart weight and left ventricular (LV) posterior wall thickness and decreases in LV ejection fraction and LV fractional shortening. More importantly, pAAV-SIRT6 treatment strikingly potentiated cardiac levels of pAMPKα and ACE2 as well as decreased levels of CTGF, FKN, TGFβ1, collagen I and collagen III, resulting in alleviation of Ang II-induced pathological hypertrophy, myocardial fibrosis, cardiac dysfunction and ultrastructural injury in hypertensive rats. In conclusion, our findings confirmed cardioprotective effects of SIRT6 on pathological remodeling, fibrosis and myocardial injury through activation of AMPK-ACE2 signaling and suppression of CTGF-FKN pathway, indicating that SIRT6 functions as a partial agonist of ACE2 and targeting SIRT6 has potential therapeutic importance for cardiac fibrosis and heart disease.
Collapse
|