51
|
Wu L, Shi A, Zhu D, Bo L, Zhong Y, Wang J, Xu Z, Mao C. High sucrose intake during gestation increases angiotensin II type 1 receptor-mediated vascular contractility associated with epigenetic alterations in aged offspring rats. Peptides 2016; 86:133-144. [PMID: 27818235 DOI: 10.1016/j.peptides.2016.11.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 10/10/2016] [Accepted: 11/01/2016] [Indexed: 12/31/2022]
Abstract
Accruing evidence have confirmed that the fetal programming in response to adverse environmental in utero factors plays essential roles in the pathogenesis of hypertension in later life. High sugar intake has been accepted worldwide in everyday life diet and becomes the critical public health issue. Our previous studies indicated that intake of high sucrose (HS) during pregnancy could change the vascular reactivity and dipsogenic behavior closely associated with abnormal renin-angiotensin system (RAS), to increase the risk of hypertension in adult offspring. In the present study, we tested the hypothesis that maternal HS intake in pregnancy may further deteriorate the Ang II-induced cardiovascular responses in the aged offspring. HS intake was provided to pregnant rats throughout the gestation. Blood pressure (BP) in conscious state and vascular contractility in vitro were measured in 22-month-old aged offspring rats. In addition, mRNA and protein expressions and epigenetic changes of Ang II type 1 receptor (AT1R) gene in blood vessels were determined with the methods of real-time RT-PCR, Western blotting, and Chromatin Immunoprecipitation Assay (CHIP). Results showed that, in the aged offspring, maternal HS intake during gestation would cause the elevation of basal BP which could be diminished by losartan. Although the circulatory Ang II was not changed, levels of local Ang II were significantly increased in blood vessels. In addition, prenatal HS exposure would significantly enhance the AT1R-mediated vasoconstrictions in both aorta and mesenteric arteries of the aged offspring. Moreover, in the aged offspring of prenatal HS exposure, mRNA and protein expressions of AT1R gene in both large and small blood vessels were significantly increased, which should be closely associated with the changes of epigenetic mechanisms such as histone modifications. Collectively, we proposed that maternal HS intake during gestation would cause abnormal BP responses mediated via the enhancement of vascular RAS, together with the increased expression of AT1R gene related to the its epigenetic changes, which would actually lead to the overt phenotype of hypertension in the aged offspring.
Collapse
MESH Headings
- Angiotensin II/pharmacology
- Angiotensin II/physiology
- Animals
- Aorta/drug effects
- Aorta/physiopathology
- Epigenesis, Genetic/drug effects
- Female
- Fetal Development
- Histones/metabolism
- Mesenteric Arteries/drug effects
- Mesenteric Arteries/physiopathology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiopathology
- Pregnancy
- Prenatal Exposure Delayed Effects/chemically induced
- Prenatal Exposure Delayed Effects/genetics
- Prenatal Exposure Delayed Effects/metabolism
- Promoter Regions, Genetic
- Protein Binding
- Protein Processing, Post-Translational
- Rats, Sprague-Dawley
- Receptor, Angiotensin, Type 1/physiology
- Sucrose/toxicity
- TATA-Box Binding Protein/metabolism
- Transcriptome
- Vasoconstriction
Collapse
Affiliation(s)
- Lei Wu
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China; Suzhou Industrial Park Centers for Disease Control and Prevention, Suzhou, China
| | - Aiping Shi
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China; Zhangjiagang Centers for Disease Control and Prevention, Suzhou, China
| | - Di Zhu
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China
| | - Le Bo
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China
| | - Yuan Zhong
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China
| | - Juan Wang
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China
| | - Zhice Xu
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China
| | - Caiping Mao
- Institute for Fetology and Reproductive Medicine Center, First Hospital of Soochow University, Suzhou, 215006, China.
| |
Collapse
|
52
|
Affiliation(s)
- Angela Palumbo
- Centro de Asistencia a la Reproducción Humana de Canarias, La Laguna, Tenerife, Spain
- Department of Obstetrics and Gynecology, New York University School of Medicine, New York, NY, USA
| | - Julio Ávila
- Laboratorio de Biología del Desarrollo, UDI de Bioquímica y Biología Molecular, Universidad de La Laguna, La Laguna, Tenerife, Spain
- Centro de Investigaciones Biomédicas de Canarias, Universidad de La Laguna, Tenerife, Spain
| | - Frederick Naftolin
- Department of Obstetrics and Gynecology, New York University School of Medicine, New York, NY, USA
| |
Collapse
|
53
|
Ahmadian E, Pennefather PS, Eftekhari A, Heidari R, Eghbal MA. Role of renin-angiotensin system in liver diseases: an outline on the potential therapeutic points of intervention. Expert Rev Gastroenterol Hepatol 2016; 10:1279-1288. [PMID: 27352778 DOI: 10.1080/17474124.2016.1207523] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The current review aimed to outline the functions of the renin angiotensin system (RAS) in the context of the oxidative stress-associated liver disease. Areas covered: Angiotensin II (Ang II) as the major effector peptide of the RAS is a pro-oxidant and fibrogenic cytokine. Mechanistically, NADPH oxidase (NOX) is a multicomponent enzyme complex that is able to generate reactive oxygen species (ROS) as a downstream signaling pathway of Ang II which is expressed in liver. Ang II has a detrimental role in the pathogenesis of chronic liver disease through possessing pro-oxidant, fibrogenic, and pro-inflammatory impact in the liver. The alternative axis (ACE2/Ang(1-7)/mas) of the RAS serves as an anti-inflammatory, antioxidant and anti-fibrotic component of the RAS. Expert commentary: In summary, the use of alternative axis inhibitors accompanying with ACE2/ Ang(1-7)/mas axis activation is a promising new strategy serving as a novel therapeutic option to prevent and treat chronic liver diseases.
Collapse
Affiliation(s)
- Elham Ahmadian
- a Drug Applied Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,b Biotechnology Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,c Pharmacology and Toxicology Department, School of Pharmacy , Tabriz University of Medical Sciences , Tabriz , Iran.,d Students Research Committee , Tabriz University of Medical Sciences , Tabriz , Iran
| | - Peter S Pennefather
- e Leslie Dan Faculty of Pharmacy , University of Toronto , Toronto , ON , Canada
| | - Aziz Eftekhari
- a Drug Applied Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,d Students Research Committee , Tabriz University of Medical Sciences , Tabriz , Iran
| | - Reza Heidari
- f Pharmaceutical Sciences Research Center , Shiraz University of Medical Sciences , Shiraz , Iran.,g Gerash School of Paramedical Sciences , Shiraz University of Medical Sciences , Shiraz , Iran
| | - Mohammad Ali Eghbal
- a Drug Applied Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,b Biotechnology Research Center , Tabriz University of Medical Sciences , Tabriz , Iran.,c Pharmacology and Toxicology Department, School of Pharmacy , Tabriz University of Medical Sciences , Tabriz , Iran
| |
Collapse
|
54
|
De Mello W. Intracellular renin increases the inward calcium current in smooth muscle cells of mesenteric artery of SHR. Implications for hypertension and vascular remodeling. Peptides 2016; 84:36-43. [PMID: 27545826 DOI: 10.1016/j.peptides.2016.08.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 07/15/2016] [Accepted: 08/18/2016] [Indexed: 01/12/2023]
Abstract
UNLABELLED The influence of intracellular renin on the inward calcium current in isolated smooth muscle cells from SHR mesenteric arteries was investigated. Measurements of calcium current were performed using the whole cell configuration of pCLAMP. The results indicated that: 1) renin (100nM) dialyzed into smooth muscle cells, increased the inward calcium current; 2) verapamil (10-9M) administered to the bath inhibited the effect of renin on the inward calcium current; 3) concurrently with the increase of calcium current a depolarization of 6.8+/-2.1mV (n=16)(P<0.05) was found in cells dialyzed with renin; 4) intracellular dialysis of renin (100nM) into smooth muscle cells isolated from mesenteric arteries of normal Wystar Kyoto rats showed no significant change on calcium current; 5) aliskiren (10-9M) dialyzed into the cell together with renin (100nM) abolished the effect of the enzyme on the calcium current in SHR; 6) Ang II (100nM) dialyzed into the smooth muscle cell from mesenteric artery of SHR in absence of renin, decreased the calcium current-an effect greatly reduced by valsartan (10-9M) added to the cytosol; 7) administration of renin (100nM) plus angiotensinogen (100nM) into the cytosol of muscles cells from SHR rats reduced the inward calcium current; 8) extracellular administration of Ang II (100nM) increased the inward calcium current in mesenteric arteries of SHR. CONCLUSIONS intracellular renin in vascular resistance vessels from SHR due to internalization or expression, contributes to the regulation of vascular tone and control of peripheral resistance-an effect independently of Ang II. Implications for hypertension and vascular remodeling are discussed.
Collapse
Affiliation(s)
- Walmor De Mello
- School of Medicine, Medical Sciences Campus, UPR, San Juan, PR 00936, USA.
| |
Collapse
|
55
|
Ferrario CM, Ahmad S, Varagic J, Cheng CP, Groban L, Wang H, Collawn JF, Dell Italia LJ. Intracrine angiotensin II functions originate from noncanonical pathways in the human heart. Am J Physiol Heart Circ Physiol 2016; 311:H404-14. [PMID: 27233763 PMCID: PMC5008653 DOI: 10.1152/ajpheart.00219.2016] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Accepted: 05/26/2016] [Indexed: 12/11/2022]
Abstract
Although it is well-known that excess renin angiotensin system (RAS) activity contributes to the pathophysiology of cardiac and vascular disease, tissue-based expression of RAS genes has given rise to the possibility that intracellularly produced angiotensin II (Ang II) may be a critical contributor to disease processes. An extended form of angiotensin I (Ang I), the dodecapeptide angiotensin-(1-12) [Ang-(1-12)], that generates Ang II directly from chymase, particularly in the human heart, reinforces the possibility that an alternative noncanonical renin independent pathway for Ang II formation may be important in explaining the mechanisms by which the hormone contributes to adverse cardiac and vascular remodeling. This review summarizes the work that has been done in evaluating the functional significance of Ang-(1-12) and how this substrate generated from angiotensinogen by a yet to be identified enzyme enhances knowledge about Ang II pathological actions.
Collapse
Affiliation(s)
- Carlos M Ferrario
- Departments of Surgery, Internal Medicine-Nephrology and Physiology-Pharmacology, Wake Forest University Health Science Center, Winston-Salem, North Carolina;
| | - Sarfaraz Ahmad
- Departments of Surgery, Internal Medicine-Nephrology and Physiology-Pharmacology, Wake Forest University Health Science Center, Winston-Salem, North Carolina
| | - Jasmina Varagic
- Departments of Surgery, Internal Medicine-Nephrology and Physiology-Pharmacology, Wake Forest University Health Science Center, Winston-Salem, North Carolina; Hypertension and Vascular Research Center, Wake Forest University Health Science Center, Winston-Salem, North Carolina
| | - Che Ping Cheng
- Section on Cardiovascular Medicine, Department of Internal Medicine, Wake Forest University Health Science Center, Winston-Salem, North Carolina
| | - Leanne Groban
- Hypertension and Vascular Research Center, Wake Forest University Health Science Center, Winston-Salem, North Carolina; Department of Anesthesiology, Wake Forest University Health Science Center, Winston-Salem, North Carolina
| | - Hao Wang
- Department of Anesthesiology, Wake Forest University Health Science Center, Winston-Salem, North Carolina
| | - James F Collawn
- Departments of Cell Biology, Microbiology, Physiology, University of Alabama Birmingham, Alabama; and
| | - Louis J Dell Italia
- Departments of Cell Biology, Microbiology, Physiology, University of Alabama Birmingham, Alabama; and Division of Cardiovascular Disease, University of Alabama at Birmingham and Department of Veterans Affairs, Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| |
Collapse
|
56
|
Dhamrait SS, Maubaret C, Pedersen-Bjergaard U, Brull DJ, Gohlke P, Payne JR, World M, Thorsteinsson B, Humphries SE, Montgomery HE. Mitochondrial uncoupling proteins regulate angiotensin-converting enzyme expression: crosstalk between cellular and endocrine metabolic regulators suggested by RNA interference and genetic studies. Bioessays 2016; 38 Suppl 1:S107-18. [DOI: 10.1002/bies.201670909] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 02/11/2015] [Indexed: 12/28/2022]
Affiliation(s)
- Sukhbir S. Dhamrait
- Centre for Cardiovascular Genetics, BHF Laboratories; University College London; London UK
- Department of Cardiology; Western Sussex Hospitals NHS Trust; West Sussex UK
| | - Cecilia Maubaret
- Centre INSERM U897-Epidemiologie-Biostatistique; Bordeaux France
| | - Ulrik Pedersen-Bjergaard
- Department of Cardiology, Nephrology and Endocrinology; Hillerød Hospital; Hillerød Denmark
- Faculty of Health Sciences; University of Copenhagen; Copenhagen Denmark
| | - David J. Brull
- Centre for Cardiovascular Genetics, BHF Laboratories; University College London; London UK
- Department of Cardiology; The Whittington Hospital NHS Trust; London UK
| | - Peter Gohlke
- Institute of Experimental and Clinical Pharmacology; University Hospital of Schleswig-Holstein; Kiel Germany
| | - John R. Payne
- Centre for Cardiovascular Genetics, BHF Laboratories; University College London; London UK
- Scottish National Advanced Heart Failure Service; Golden Jubilee National Hospital; Clydebank UK
| | - Michael World
- Royal Centre for Defence Medicine; Queen Elizabeth Hospital; Birmingham UK
| | - Birger Thorsteinsson
- Department of Cardiology, Nephrology and Endocrinology; Hillerød Hospital; Hillerød Denmark
- Faculty of Health Sciences; University of Copenhagen; Copenhagen Denmark
| | - Steve E. Humphries
- Centre for Cardiovascular Genetics, BHF Laboratories; University College London; London UK
| | - Hugh E. Montgomery
- UCL and National Centre for Sport, Exercise & Health; University College London; London UK
- UCL Institute for Human Health and Performance; University College London; London UK
| |
Collapse
|
57
|
Eadie AL, Simpson JA, Brunt KR. "Fibroblast" pharmacotherapy - Advancing the next generation of therapeutics for clinical cardiology. J Mol Cell Cardiol 2016; 94:176-179. [PMID: 27060557 DOI: 10.1016/j.yjmcc.2016.03.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 03/31/2016] [Indexed: 10/22/2022]
Affiliation(s)
- Ashley L Eadie
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Canada
| | - Jeremy A Simpson
- Department of Human Health & Nutritional Sciences, University of Guelph, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Canada.
| |
Collapse
|
58
|
Hu R, Li SL, Bai HT, Wang YX, Liu LB, Lv FT, Wang S. Regulation of oxidative stress inside living cells through polythiophene derivatives. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2016.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
59
|
De Mello WC. Intracellular angiotensin II as a regulator of muscle tone in vascular resistance vessels. Pathophysiological implications. Peptides 2016; 78:87-90. [PMID: 26944358 DOI: 10.1016/j.peptides.2016.02.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 01/19/2016] [Accepted: 02/23/2016] [Indexed: 12/26/2022]
Abstract
The influence of intracellular angiotensin II on the regulation of potassium current and membrane potential of smooth muscle cells of mesenteric arteries and its relevance for the regulation of vascular tone was reviewed. The presence of components of the renin angiotensin system (RAS) in different cells of the cardiovascular system, was discussed including their presence in the nuclei and mitochondria. Emphasis was given to the opposite effects of intracellular and extracellular angiotensin II (Ang II) on the regulation of potassium current, membrane potential and contractility of vascular resistance vessels and its implication to vascular physiology and pathology and the possible role of epigenetic factors on the expression of angiotensin II (Ang II) and renin in vascular resistance vessels as well as its possible pathophysiological role in hypertension and other cardiovascular diseases.
Collapse
Affiliation(s)
- Walmor C De Mello
- School of Medicine, Medical Sciences Campus, UPR, San Juan, PR 00936-5067, USA.
| |
Collapse
|
60
|
Taskin E, Guven C, Sahin L, Dursun N. The Cooperative Effect of Local Angiotensin-II in Liver with Adriamycin Hepatotoxicity on Mitochondria. Med Sci Monit 2016; 22:1013-21. [PMID: 27019222 PMCID: PMC4815994 DOI: 10.12659/msm.895845] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Adriamycin (ADR) is a drug used clinically for anticancer treatment; however, it causes adverse effects in the liver. The mechanism by which these adverse effects occur remains unclear, impeding efforts to enhance the therapeutic effects of ADR. Its hepatotoxicity might be related to increasing reactive oxygen species (ROS) and mitochondrial dysfunction. The interaction between ADR and the local renin-angiotensin system (RAS) in the liver is unclear. ADR might activate the RAS. Angiotensin-II (Ang-II) leads to ROS production and mitochondrial dysfunction. In the present study we investigated whether ADR's hepatotoxicity interacts with local RAS in causing oxidative stress resulting from mitochondrial dysfunction in the rat liver. MATERIAL/METHODS Rats were divided into 5 groups: control, ADR, co-treated ADR with captopril, co-treated ADR with Aliskiren, and co-treated ADR with both captopril and Aliskiren. Mitochondria and cytosol were separated from the liver, then biochemical measurements were made from them. Mitochondrial membrane potential (MMP) and ATP levels were evaluated. RESULTS ADR remarkably decreased MMP and ATP in liver mitochondria (p<0.05). Co-administration with ADR and Aliskiren and captopril improved the dissipation of MMP (p<0.05). The decreased ATP level was restored by treatment with inhibitors of ACE and renin. CONCLUSIONS Angiotensin-II may contribute to hepatotoxicity of in the ADR via mitochondrial oxidative production, resulting in the attenuation of MMP and ATP production.
Collapse
Affiliation(s)
- Eylem Taskin
- Department of Physiotherapy and Rehabilitation, School of Health Sciences, Istanbul Bilim University, Istanbul, Turkey
| | - Celal Guven
- Department of Biophysics, Faculty of Medicine, University of Adiyaman, Adiyaman, Turkey
| | - Leyla Sahin
- Department of Physiology, Faculty of Medicine, University of Mersin, Mersin, Turkey
| | - Nurcan Dursun
- Department of Physiology, Faculty of Medicine, University of Erciyes, Kayseri, Turkey
| |
Collapse
|
61
|
Evidence to Consider Angiotensin II Receptor Blockers for the Treatment of Early Alzheimer’s Disease. Cell Mol Neurobiol 2016; 36:259-79. [DOI: 10.1007/s10571-015-0327-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 12/31/2015] [Indexed: 12/12/2022]
|
62
|
Effect of angiotensin II on voltage-gated sodium currents in aortic baroreceptor neurons and arterial baroreflex sensitivity in heart failure rats. J Hypertens 2016; 33:1401-10. [PMID: 25827427 DOI: 10.1097/hjh.0000000000000563] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND Impairment of arterial baroreflex sensitivity is associated with mortality in patients with chronic heart failure (CHF). Elevation of plasma angiotension II (Ang II) contributes to arterial baroreflex dysfunction in CHF. A reduced number of voltage-gated sodium (Nav) channels in aortic baroreceptor neurons are involved in CHF-blunted arterial baroreflex. METHOD In this study, we investigated acute effect of Ang II on Nav currents in the aortic baroreceptor neuron and on arterial baroreflex in sham and coronary artery ligation-induced CHF rats. RESULTS Using Ang II I radioimmunoassay, real-time reverse transcription-PCR and western blot, we found that Ang II levels, and mRNA and protein expression of angiotension II type 1 receptor in nodose ganglia from CHF rats were higher than that from sham rats. Local microinjection of Ang II (0.2 nmol) into the nodose ganglia decreased the arterial baroreflex sensitivity in sham rats, whereas losartan (1 nmol, an angiotension II type 1 receptor antagonist) improved the arterial baroreflex sensitivity in CHF rats. Data from patch-clamp recording showed that Ang II (100 nmol/l) acutely inhibited Nav currents in the aortic baroreceptor neurons from sham and CHF rats. In particular, inhibitory effect of Ang II on Nav currents in the aortic baroreceptor neurons was larger in CHF rats than that in sham rats. Losartan (1 μmol/l) totally abolished the inhibitory effect of Ang II on Nav currents in sham and CHF aortic baroreceptor neurons. CONCLUSION These results suggest that elevation of endogenous Ang II in the nodose ganglia contributes to impairment of the arterial baroreflex function in CHF rats through inhibiting Nav channels.
Collapse
|
63
|
Ferrario CM, VonCannon J, Jiao Y, Ahmad S, Bader M, Dell'Italia LJ, Groban L, Varagic J. Cardiac angiotensin-(1-12) expression and systemic hypertension in rats expressing the human angiotensinogen gene. Am J Physiol Heart Circ Physiol 2016; 310:H995-1002. [PMID: 26873967 DOI: 10.1152/ajpheart.00833.2015] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 02/08/2016] [Indexed: 12/12/2022]
Abstract
Angiotensin-(1-12) [ANG-(1-12)] is processed into ANG II by chymase in rodent and human heart tissue. Differences in the amino acid sequence of rat and human ANG-(1-12) render the human angiotensinogen (hAGT) protein refractory to cleavage by renin. We used transgenic rats harboring the hAGT gene [TGR(hAGT)L1623] to assess the non-renin-dependent effects of increased hAGT expression on heart function and arterial pressure. Compared with Sprague-Dawley (SD) control rats (n= 11), male homozygous TGR(hAGT)L1623 (n= 9) demonstrated sustained daytime and nighttime hypertension associated with no changes in heart rate but increased heart rate lability. Increased heart weight/tibial length ratio and echocardiographic indexes of cardiac hypertrophy were associated with modest reduction of systolic function in hAGT rats. Robust human ANG-(1-12) immunofluorescence within myocytes of TGR(hAGT)L1623 rats was associated with a fourfold increase in cardiac ANG II content. Chymase enzymatic activity, using the rat or human ANG-(1-12) as a substrate, was not different in the cardiac tissue of SD and hAGT rats. Since both cardiac angiotensin-converting enzyme (ACE) and ACE2 activities were not different among the two strains, the changes in cardiac structure and function, blood pressure, and left ventricular ANG II content might be a product of an increased cardiac expression of ANG II generated through a non-renin-dependent mechanism. The data also underscore the existence in the rat of alternate enzymes capable of acting on hAGT protein. Homozygous transgenic rats expressing the hAGT gene represent a novel tool to investigate the contribution of human relevant renin-independent cardiac ANG II formation and function.
Collapse
Affiliation(s)
- Carlos M Ferrario
- Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina; Departments of Medicine-Nephrology and Physiology-Pharmacology, Wake Forest School of Medicine, Winston Salem, North Carolina
| | - Jessica VonCannon
- Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina; Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston Salem, North Carolina
| | - Yan Jiao
- Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina
| | - Sarfaraz Ahmad
- Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston Salem, North Carolina
| | - Michael Bader
- Max-Delbrück-Center for Molecular Medicine (MDC), Berlin, Germany
| | - Louis J Dell'Italia
- Division of Cardiovascular Disease, University of Alabama at Birmingham and Department of Veterans Affairs, Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| | - Leanne Groban
- Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston Salem, North Carolina; Department of Anesthesiology, Wake Forest School of Medicine, Winston Salem, North Carolina; and
| | - Jasmina Varagic
- Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina; Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston Salem, North Carolina; Departments of Medicine-Nephrology and Physiology-Pharmacology, Wake Forest School of Medicine, Winston Salem, North Carolina
| |
Collapse
|
64
|
Chappell MC. Biochemical evaluation of the renin-angiotensin system: the good, bad, and absolute? Am J Physiol Heart Circ Physiol 2015; 310:H137-52. [PMID: 26475588 DOI: 10.1152/ajpheart.00618.2015] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 10/15/2015] [Indexed: 02/07/2023]
Abstract
The renin-angiotensin system (RAS) constitutes a key hormonal system in the physiological regulation of blood pressure through peripheral and central mechanisms. Indeed, dysregulation of the RAS is considered a major factor in the development of cardiovascular pathologies, and pharmacological blockade of this system by the inhibition of angiotensin-converting enzyme (ACE) or antagonism of the angiotensin type 1 receptor (AT1R) offers an effective therapeutic regimen. The RAS is now defined as a system composed of different angiotensin peptides with diverse biological actions mediated by distinct receptor subtypes. The classic RAS comprises the ACE-ANG II-AT1R axis that promotes vasoconstriction; water intake; sodium retention; and increased oxidative stress, fibrosis, cellular growth, and inflammation. In contrast, the nonclassical RAS composed primarily of the ANG II/ANG III-AT2R and the ACE2-ANG-(1-7)-AT7R pathways generally opposes the actions of a stimulated ANG II-AT1R axis. In lieu of the complex and multifunctional aspects of this system, as well as increased concerns on the reproducibility among laboratories, a critical assessment is provided on the current biochemical approaches to characterize and define the various components that ultimately reflect the status of the RAS.
Collapse
Affiliation(s)
- Mark C Chappell
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| |
Collapse
|
65
|
Malinauskas M, Wallenius V, Fändriks L, Casselbrant A. Local expression of AP/AngIV/IRAP and effect of AngIV on glucose-induced epithelial transport in human jejunal mucosa. J Renin Angiotensin Aldosterone Syst 2015; 16:1101-8. [PMID: 26311161 DOI: 10.1177/1470320315599514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 07/12/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Recently it was shown that the classic renin-angiotensin system (RAS) is locally expressed in small intestinal enterocytes and exerts autocrine control of glucose transport. The aim of this study was to investigate if key components for the Angiotensin III (AngIII) and IV (AngIV) formation enzymes and the AngIV receptor, insulin-regulated aminopeptidase (IRAP), are present in the healthy jejunal mucosa. A second aim was to investigate AngIV effects on glucose-induced mucosal transport in vitro. MATERIAL AND METHODS Enteroscopy with mucosal biopsy sampling was performed in healthy volunteers. ELISA, Western blotting and immunohistochemistry were used to assess the protein levels and localization. The functional effect of AngIV was examined in Ussing chambers. RESULTS The substrate Angiotensin II, the enzymes aminopeptidases-A, B, M as well as IRAP were detected in the jejunal mucosa. Immunohistochemistry localized the enzymes to the apical brush-border membrane whereas IRAP was localized in the subapical cytosolic compartment in the enterocyte. AngIV increased the glucose-induced electrogenic transport in vitro. CONCLUSION The present study indicates the presence of substrates and enzymes necessary for AngIV formation as well as the receptor IRAP in the jejunal mucosa. The functional data suggest that AngIV regulates glucose uptake in the healthy human small intestine.
Collapse
Affiliation(s)
- M Malinauskas
- Institute of Physiology and Pharmacology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania Department of Gastrosurgical Research and Education, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
| | - V Wallenius
- Department of Gastrosurgical Research and Education, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
| | - L Fändriks
- Department of Gastrosurgical Research and Education, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
| | - A Casselbrant
- Department of Gastrosurgical Research and Education, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
| |
Collapse
|
66
|
Dhamrait SS, Maubaret C, Pedersen-Bjergaard U, Brull DJ, Gohlke P, Payne JR, World M, Thorsteinsson B, Humphries SE, Montgomery HE. Mitochondrial uncoupling proteins regulate angiotensin-converting enzyme expression: crosstalk between cellular and endocrine metabolic regulators suggested by RNA interference and genetic studies. ACTA ACUST UNITED AC 2015; 1:70-81. [PMID: 27347560 PMCID: PMC4915277 DOI: 10.1002/icl3.1019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 02/11/2015] [Indexed: 12/18/2022]
Abstract
Uncoupling proteins (UCPs) regulate mitochondrial function, and thus cellular metabolism. Angiotensin‐converting enzyme (ACE) is the central component of endocrine and local tissue renin–angiotensin systems (RAS), which also regulate diverse aspects of whole‐body metabolism and mitochondrial function (partly through altering mitochondrial UCP expression). We show that ACE expression also appears to be regulated by mitochondrial UCPs. In genetic analysis of two unrelated populations (healthy young UK men and Scandinavian diabetic patients) serum ACE (sACE) activity was significantly higher amongst UCP3‐55C (rather than T) and UCP2 I (rather than D) allele carriers. RNA interference against UCP2 in human umbilical vein endothelial cells reduced UCP2 mRNA sixfold (P < 0·01) whilst increasing ACE expression within a physiological range (<1·8‐fold at 48 h; P < 0·01). Our findings suggest novel hypotheses. Firstly, cellular feedback regulation may occur between UCPs and ACE. Secondly, cellular UCP regulation of sACE suggests a novel means of crosstalk between (and mutual regulation of) cellular and endocrine metabolism. This might partly explain the reduced risk of developing diabetes and metabolic syndrome with RAS antagonists and offer insight into the origins of cardiovascular disease in which UCPs and ACE both play a role.
Collapse
Affiliation(s)
- Sukhbir S Dhamrait
- Centre for Cardiovascular Genetics, BHF Laboratories University College London London UK; Department of Cardiology Western Sussex Hospitals NHS Trust West Sussex UK
| | | | - Ulrik Pedersen-Bjergaard
- Department of Cardiology, Nephrology and Endocrinology Hillerød Hospital Hillerød Denmark; Faculty of Health Sciences University of Copenhagen Copenhagen Denmark
| | - David J Brull
- Centre for Cardiovascular Genetics, BHF Laboratories University College London London UK; Department of Cardiology The Whittington Hospital NHS Trust London UK
| | - Peter Gohlke
- Institute of Experimental and Clinical Pharmacology University Hospital of Schleswig-Holstein Kiel Germany
| | - John R Payne
- Centre for Cardiovascular Genetics, BHF Laboratories University College London London UK; Scottish National Advanced Heart Failure Service Golden Jubilee National Hospital Clydebank UK
| | - Michael World
- Royal Centre for Defence Medicine Queen Elizabeth Hospital Birmingham UK
| | - Birger Thorsteinsson
- Department of Cardiology, Nephrology and Endocrinology Hillerød Hospital Hillerød Denmark; Faculty of Health Sciences University of Copenhagen Copenhagen Denmark
| | - Steve E Humphries
- Centre for Cardiovascular Genetics, BHF Laboratories University College London London UK
| | - Hugh E Montgomery
- UCL and National Centre for Sport, Exercise & Health University College London London UK; UCL Institute for Human Health and Performance University College London London UK
| |
Collapse
|
67
|
Nagata S, Varagic J, Kon ND, Wang H, Groban L, Simington SW, Ahmad S, Dell'Italia LJ, VonCannon JL, Deal D, Ferrario CM. Differential expression of the angiotensin-(1-12)/chymase axis in human atrial tissue. Ther Adv Cardiovasc Dis 2015; 9:168-80. [PMID: 26082339 PMCID: PMC5823505 DOI: 10.1177/1753944715589717] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVE Heart chymase rather than angiotensin converting enzyme has higher specificity for angiotensin (Ang) I conversion into Ang II in humans. A new pathway for direct cardiac Ang II generation has been revealed through the demonstration that Ang-(1-12) is cleaved by chymase to generate Ang II directly. We address here whether Ang-(1-12) and chymase gene expression and activity are detected in the atrial appendages of 44 patients (10 females) undergoing heart surgery for the correction of valvular heart disease, resistant atrial fibrillation or ischemic heart disease. METHODS AND RESULTS Immunoreactive Ang-(1-12) expression was 54% higher in left atrial compared with right atrial appendages. This was associated with higher abundance of left atrial appendage chymase gene transcripts and chymase activity, but no differences in angiotensinogen mRNA. Atrial chymase enzymatic activity was highly correlated with left atrial but not right atrial enlargement as determined by echocardiography, while both tyrosine hydroxylase and neuropeptide Y atrial appendage mRNAs correlated with atrial angiotensinogen mRNAs. CONCLUSIONS Higher Ang-(1-12) expression and upregulation of chymase gene transcripts and enzymatic activity from the atrial appendages connected to the enlarged left versus right atrial chambers of subjects with left heart disease defines a role of this alternate Ang II forming pathway in the processes accompanying adverse atrial and ventricular remodeling.
Collapse
Affiliation(s)
- Sayaka Nagata
- Division of Surgical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Jasmina Varagic
- Division of Surgical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, NC, USA Department of Physiology/Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Neal D Kon
- Cardiothoracic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Hao Wang
- Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, NC, USA Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Leanne Groban
- Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, NC, USA Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Stephen W Simington
- Division of Surgical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Sarfaraz Ahmad
- Division of Surgical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Louis J Dell'Italia
- Birmingham Veterans Affair Medical Center, University of Alabama Medical Center, Birmingham, AL, USA Division of Cardiovascular Disease, Department of Medicine, University of Alabama Medical Center, Birmingham, AL, USA
| | - Jessica L VonCannon
- Division of Surgical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Dwight Deal
- Cardiothoracic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Carlos M Ferrario
- Division of Surgical Sciences, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| |
Collapse
|
68
|
Jiang X, Zhang F, Ning Q. Losartan reverses the down-expression of long noncoding RNA-NR024118 and Cdkn1c induced by angiotensin II in adult rat cardiac fibroblasts. ACTA ACUST UNITED AC 2015; 63:122-5. [DOI: 10.1016/j.patbio.2015.04.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 04/17/2015] [Indexed: 10/23/2022]
|
69
|
Activation of intracellular angiotensin AT₂ receptors induces rapid cell death in human uterine leiomyosarcoma cells. Clin Sci (Lond) 2015; 128:567-78. [PMID: 25487516 DOI: 10.1042/cs20140627] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The presence of angiotensin type 2 (AT₂) receptors in mitochondria and their role in NO generation and cell aging were recently demonstrated in various human and mouse non-tumour cells. We investigated the intracellular distribution of AT₂ receptors including their presence in mitochondria and their role in the induction of apoptosis and cell death in cultured human uterine leiomyosarcoma (SK-UT-1) cells and control human uterine smooth muscle cells (HutSMC). The intracellular levels of the AT₂ receptor are low in proliferating SK-UT-1 cells but the receptor is substantially up-regulated in quiescent SK-UT-1 cells with high densities in mitochondria. Activation of the cell membrane AT₂ receptors by a concomitant treatment with angiotensin II and the AT₁ receptor antagonist, losartan, induces apoptosis but does not affect the rate of cell death. We demonstrate for the first time that the high-affinity, non-peptide AT₂ receptor agonist, Compound 21 (C21), penetrates the cell membrane of quiescent SK-UT-1 cells, activates intracellular AT₂ receptors and induces rapid cell death; approximately 70% of cells died within 24 h. The cells, which escaped cell death, displayed activation of the mitochondrial apoptotic pathway, i.e. down-regulation of the Bcl-2 protein, induction of the Bax protein and activation of caspase-3. All quiescent SK-UT-1 cells died within 5 days after treatment with a single dose of C21. C21 was devoid of cytotoxic effects in proliferating SK-UT-1 cells and in quiescent HutSMC. Our results point to a new, unique approach enabling the elimination non-cycling uterine leiomyosarcoma cells providing that they over-express the AT₂ receptor.
Collapse
|
70
|
Abstract
Angiotensin II receptor blockers (ARBs, collectively called sartans) are widely used compounds therapeutically effective in cardiovascular disorders, renal disease, the metabolic syndrome, and diabetes. It has been more recently recognized that ARBs are neuroprotective and have potential therapeutic use in many brain disorders. ARBs ameliorate inflammatory and apoptotic responses to glutamate, interleukin 1β and bacterial endotoxin in cultured neurons, astrocytes, microglial, and endothelial cerebrovascular cells. When administered systemically, ARBs enter the brain, protecting cerebral blood flow, maintaining blood brain barrier function and decreasing cerebral hemorrhage, excessive brain inflammation and neuronal injury in animal models of stroke, traumatic brain injury, Alzheimer's and Parkinson's disease and other brain conditions. Epidemiological analyses reported that ARBs reduced the progression of Alzheimer's disease, and clinical studies suggested amelioration of cognitive loss following stroke and aging. ARBs are pharmacologically heterogeneous; their effects are not only the result of Ang II type 1(AT1) receptor blockade but also of additional mechanisms selective for only some compounds of the class. These include peroxisome proliferator-activated receptor gamma activation and other still poorly defined mechanisms. However, the complete pharmacological spectrum and therapeutic efficacy of individual ARBs have never been systematically compared, and the neuroprotective efficacy of these compounds has not been rigorously determined in controlled clinical studies. The accumulation of pre-clinical evidence should promote further epidemiological and controlled clinical studies. Repurposing ARBs for the treatment of brain disorders, currently without effective therapy, may be of immediate and major translational value.
Collapse
Affiliation(s)
- Sonia Villapol
- Department of Neuroscience, Georgetown University Medical Center, Washington, District of Columbia, USA
| | - Juan M Saavedra
- Department of Pharmacology and Physiology, Georgetown University Medical Center, Washington, District of Columbia, USA.
| |
Collapse
|
71
|
Wilson BA, Cruz-Diaz N, Marshall AC, Pirro NT, Su Y, Gwathmey TM, Rose JC, Chappell MC. An angiotensin-(1-7) peptidase in the kidney cortex, proximal tubules, and human HK-2 epithelial cells that is distinct from insulin-degrading enzyme. Am J Physiol Renal Physiol 2015; 308:F594-601. [PMID: 25568136 DOI: 10.1152/ajprenal.00609.2014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Angiotensin 1-7 [ANG-(1-7)] is expressed within the kidney and exhibits renoprotective actions that antagonize the inflammatory, fibrotic, and pro-oxidant effects of ANG II. We previously identified an peptidase that preferentially metabolized ANG-(1-7) to ANG-(1-4) in the brain medulla and cerebrospinal fluid (CSF) of sheep (Marshall AC, Pirro NT, Rose JC, Diz DI, Chappell MC. J Neurochem 130: 313-323, 2014); thus the present study established the expression of the peptidase in the kidney. Utilizing a sensitive HPLC-based approach, we demonstrate a peptidase activity that hydrolyzed ANG-(1-7) to ANG-(1-4) in the sheep cortex, isolated tubules, and human HK-2 renal epithelial cells. The peptidase was markedly sensitive to the metallopeptidase inhibitor JMV-390; human HK-2 cells expressed subnanomolar sensitivity (IC50 = 0.5 nM) and the highest specific activity (123 ± 5 fmol·min(-1)·mg(-1)) compared with the tubules (96 ± 12 fmol·min(-1)·mg(-1)) and cortex (107 ± 9 fmol·min(-1)·mg(-1)). The peptidase was purified 41-fold from HK-2 cells; the activity was sensitive to JMV-390, the chelator o-phenanthroline, and the mercury-containing compound p-chloromercuribenzoic acid (PCMB), but not to selective inhibitors against neprilysin, neurolysin and thimet oligopeptidase. Both ANG-(1-7) and its endogenous analog [Ala(1)]-ANG-(1-7) (alamandine) were preferentially hydrolyzed by the peptidase compared with ANG II, [Asp(1)]-ANG II, ANG I, and ANG-(1-12). Although the ANG-(1-7) peptidase and insulin-degrading enzyme (IDE) share similar inhibitor characteristics of a metallothiolendopeptidase, we demonstrate marked differences in substrate specificity, which suggest these peptidases are distinct. We conclude that an ANG-(1-7) peptidase is expressed within the renal proximal tubule and may play a potential role in the renal renin-angiotensin system to regulate ANG-(1-7) tone.
Collapse
Affiliation(s)
- Bryan A Wilson
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Nildris Cruz-Diaz
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Allyson C Marshall
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Nancy T Pirro
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Yixin Su
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Cartolina
| | - TanYa M Gwathmey
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - James C Rose
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Cartolina
| | - Mark C Chappell
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| |
Collapse
|
72
|
Abstract
Many extracellular signaling proteins act within their cells of synthesis and/or in target cells after internalization. This type of action is called intracrine and it plays a role in diverse biological processes. The mechanisms of intracrine intracellular action are becoming clear thanks to the application of modern techniques of molecular biology. Here, progress in this area is reviewed. In particular the intracrine biology of angiotensin II is discussed.
Collapse
Affiliation(s)
- Richard N Re
- Departments of Medicine and Physiology, Tulane University School of Medicine, New Orleans, LA, USA,
| | | |
Collapse
|
73
|
Vajapey R, Rini D, Walston J, Abadir P. The impact of age-related dysregulation of the angiotensin system on mitochondrial redox balance. Front Physiol 2014; 5:439. [PMID: 25505418 PMCID: PMC4241834 DOI: 10.3389/fphys.2014.00439] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 10/27/2014] [Indexed: 12/13/2022] Open
Abstract
Aging is associated with the accumulation of various deleterious changes in cells. According to the free radical and mitochondrial theory of aging, mitochondria initiate most of the deleterious changes in aging and govern life span. The failure of mitochondrial reduction-oxidation (redox) homeostasis and the formation of excessive free radicals are tightly linked to dysregulation in the Renin Angiotensin System (RAS). A main rate-controlling step in RAS is renin, an enzyme that hydrolyzes angiotensinogen to generate angiotensin I. Angiotensin I is further converted to Angiotensin II (Ang II) by angiotensin-converting enzyme (ACE). Ang II binds with equal affinity to two main angiotensin receptors—type 1 (AT1R) and type 2 (AT2R). The binding of Ang II to AT1R activates NADPH oxidase, which leads to increased generation of cytoplasmic reactive oxygen species (ROS). This Ang II-AT1R–NADPH-ROS signal triggers the opening of mitochondrial KATP channels and mitochondrial ROS production in a positive feedback loop. Furthermore, RAS has been implicated in the decrease of many of ROS scavenging enzymes, thereby leading to detrimental levels of free radicals in the cell. AT2R is less understood, but evidence supports an anti-oxidative and mitochondria-protective function for AT2R. The overlap between age related changes in RAS and mitochondria, and the consequences of this overlap on age-related diseases are quite complex. RAS dysregulation has been implicated in many pathological conditions due to its contribution to mitochondrial dysfunction. Decreased age-related, renal and cardiac mitochondrial dysfunction was seen in patients treated with angiotensin receptor blockers. The aim of this review is to: (a) report the most recent information elucidating the role of RAS in mitochondrial redox hemostasis and (b) discuss the effect of age-related activation of RAS on generation of free radicals.
Collapse
Affiliation(s)
- Ramya Vajapey
- School of Medicine, Northeast Ohio Medical University Rootstown, OH, USA
| | - David Rini
- Division of Cellular and Molecular Medicine, Art as Applied to Medicine, Johns Hopkins University Baltimore, MD, USA
| | - Jeremy Walston
- Division of Geriatrics Medicine and Gerontology, Department of Medicine, Johns Hopkins University Baltimore, MD, USA
| | - Peter Abadir
- Division of Geriatrics Medicine and Gerontology, Department of Medicine, Johns Hopkins University Baltimore, MD, USA
| |
Collapse
|
74
|
Qi Y, Zhang K, Wu Y, Xu Z, Yong QC, Kumar R, Baker KM, Zhu Q, Chen S, Guo S. Novel mechanism of blood pressure regulation by forkhead box class O1-mediated transcriptional control of hepatic angiotensinogen. Hypertension 2014; 64:1131-40. [PMID: 25069665 DOI: 10.1161/hypertensionaha.114.03970] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The renin-angiotensin system is a major determinant of blood pressure regulation. It consists of a cascade of enzymatic reactions involving 3 components: angiotensinogen, renin, and angiotensin-converting enzyme, which generate angiotensin II as a biologically active product. Angiotensinogen is largely produced in the liver, acting as a major determinant of the circulating renin-angiotensin system, which exerts acute hemodynamic effects on blood pressure regulation. How the expression of angiotensinogen is regulated is not completely understood. Here, we hypothesize that angiotensinogen is regulated by forkhead transcription factor forkhead box class O1 (Foxo1), an insulin-suppressed transcription factor, and thereby controls blood pressure in mice. We generated liver-specific Foxo1 knockout mice, which exhibited a reduction in plasma angiotensinogen and angiotensin II levels and a significant decrease in blood pressure. Using hepatocyte cultures, we demonstrated that overexpression of Foxo1 increased angiotensinogen expression, whereas hepatocytes lacking Foxo1 demonstrated a reduction of angiotensinogen gene expression and partially impaired insulin inhibition on angiotensinogen gene expression. Furthermore, mouse angiotensinogen prompter analysis demonstrated that the angiotensinogen promoter region contains a functional Foxo1-binding site, which is responsible for both Foxo1 stimulation and insulin suppression on the promoter activity. Together, these data demonstrate that Foxo1 regulates hepatic angiotensinogen gene expression and controls plasma angiotensinogen and angiotensin II levels, modulating blood pressure control in mice.
Collapse
Affiliation(s)
- Yajuan Qi
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Kebin Zhang
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Yuxin Wu
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Zihui Xu
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Qian Chen Yong
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Rajesh Kumar
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Kenneth M Baker
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Qinglei Zhu
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Shouwen Chen
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.)
| | - Shaodong Guo
- From the Division of Molecular Cardiology, Department of Medicine, College of Medicine, Texas A&M University Health Science Center, Balyor Scott & White Health, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.); and Central Texas Veterans Health Care System, Temple (Y.Q., K.Z., Y.W., Z.X., Q.C.Y., R.K., K.M.B., Q.Z., S.C., S.G.).
| |
Collapse
|
75
|
Abstract
The RAS (renin-angiotensin system) is composed of two arms: the pressor arm containing AngII (angiotensin II)/ACE (angiotensin-converting enzyme)/AT1Rs (AngII type 1 receptors), and the depressor arm represented by Ang-(1-7) [angiotensin-(1-7)]/ACE2/Mas receptors. All of the components of the RAS are present in the brain. Within the brain, Ang-(1-7) contributes to the regulation of BP (blood pressure) by acting at regions that control cardiovascular function such that, when Ang-(1-7) is injected into the nucleus of the solitary tract, caudal ventrolateral medulla, paraventricular nucleus or anterior hypothalamic area, a reduction in BP occurs; however, when injected into the rostral ventrolateral medulla, Ang-(1-7) stimulates an increase in BP. In contrast with AngII, Ang-(1-7) improves baroreflex sensitivity and has an inhibitory neuromodulatory role in hypothalamic noradrenergic neurotransmission. Ang-(1-7) not only exerts effects related to BP regulation, but also acts as a cerebroprotective component of the RAS by reducing cerebral infarct size and neuronal apoptosis. In the present review, we provide an overview of effects elicited by Ang-(1-7) in the brain, which suggest a potential role for Ang-(1-7) in controlling the central development of hypertension.
Collapse
|
76
|
Abstract
The combination of obesity and hypertension is associated with high morbidity and mortality because it leads to cardiovascular and kidney disease. Potential mechanisms linking obesity to hypertension include dietary factors, metabolic, endothelial and vascular dysfunction, neuroendocrine imbalances, sodium retention, glomerular hyperfiltration, proteinuria, and maladaptive immune and inflammatory responses. Visceral adipose tissue also becomes resistant to insulin and leptin and is the site of altered secretion of molecules and hormones such as adiponectin, leptin, resistin, TNF and IL-6, which exacerbate obesity-associated cardiovascular disease. Accumulating evidence also suggests that the gut microbiome is important for modulating these mechanisms. Uric acid and altered incretin or dipeptidyl peptidase 4 activity further contribute to the development of hypertension in obesity. The pathophysiology of obesity-related hypertension is especially relevant to premenopausal women with obesity and type 2 diabetes mellitus who are at high risk of developing arterial stiffness and endothelial dysfunction. In this Review we discuss the relationship between obesity and hypertension with special emphasis on potential mechanisms and therapeutic targeting that might be used in a clinical setting.
Collapse
Affiliation(s)
- Vincent G DeMarco
- Internal Medicine, University of Missouri, Columbia School of Medicine, One Hospital Drive, Columbia, MO 65212, USA
| | - Annayya R Aroor
- Internal Medicine, University of Missouri, Columbia School of Medicine, One Hospital Drive, Columbia, MO 65212, USA
| | - James R Sowers
- Internal Medicine, University of Missouri, Columbia School of Medicine, One Hospital Drive, Columbia, MO 65212, USA
| |
Collapse
|
77
|
Tolpygo SM, Pevtsova EI, Shoibonov BB, Kotov AV. Comparative study of the effects of free bound and carrier protein angiotensin II in experimental hypoglycemia and hyperglycemia. Bull Exp Biol Med 2014; 156:419-22. [PMID: 24771417 DOI: 10.1007/s10517-014-2364-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Indexed: 10/25/2022]
Abstract
Experimental hypoglycemia and hyperglycemia eliminated the differences in the regulatory functions of free angiotensin II and its complexes with carrier proteins (transport protein BSA and neurospecific protein S100b) in rats. Under these conditions, free and protein-bound angiotensin II primarily suppressed operant drinking behavior and reduced the hypertensive and tachyarrhythmic effects in comparison with control rats. These changes were most pronounced during acute hyperglycemia. We hypothesized that complexes of angiotensin II with functionally different proteins are differentially and simultaneously involved in not only compensation of behavioral and hemodynamic disturbances during acute and/or chronic hypoglycemia and hyperglycemia, but also their transformation into pathological processes mediated by the so-called metabolic memory mechanisms.
Collapse
Affiliation(s)
- S M Tolpygo
- Laboratory for Physiology of Motivations, P. K. Anokhin Research Institute of Normal Physiology Russian Academy of Medical Sciences, Moscow, Russia,
| | | | | | | |
Collapse
|
78
|
Ferrario CM, Ahmad S, Nagata S, Simington SW, Varagic J, Kon N, Dell'italia LJ. An evolving story of angiotensin-II-forming pathways in rodents and humans. Clin Sci (Lond) 2014; 126:461-9. [PMID: 24329563 PMCID: PMC4280795 DOI: 10.1042/cs20130400] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Lessons learned from the characterization of the biological roles of Ang-(1-7) [angiotensin-(1-7)] in opposing the vasoconstrictor, proliferative and prothrombotic actions of AngII (angiotensin II) created an underpinning for a more comprehensive exploration of the multiple pathways by which the RAS (renin-angiotensin system) of blood and tissues regulates homoeostasis and its altered state in disease processes. The present review summarizes the progress that has been made in the novel exploration of intermediate shorter forms of angiotensinogen through the characterization of the expression and functions of the dodecapeptide Ang-(1-12) [angiotensin-(1-12)] in the cardiac production of AngII. The studies reveal significant differences in humans compared with rodents regarding the enzymatic pathway by which Ang-(1-12) undergoes metabolism. Highlights of the research include the demonstration of chymase-directed formation of AngII from Ang-(1-12) in human left atrial myocytes and left ventricular tissue, the presence of robust expression of Ang-(1-12) and chymase in the atrial appendage of subjects with resistant atrial fibrillation, and the preliminary observation of significantly higher Ang-(1-12) expression in human left atrial appendages.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Louis Joseph Dell'italia
- §Birmingham Veterans Affair Medical Center, University of Alabama Medical Center, Alabama, AL 35294, U.S.A
| |
Collapse
|
79
|
Bril A, Félétou M. [Collectrin: a new component of the renin-angiotensin system?]. Med Sci (Paris) 2014; 30:136-9. [PMID: 24572108 DOI: 10.1051/medsci/20143002007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Antoine Bril
- Recherche et développement, Institut de recherches internationales Servier, 53, rue Carnot, 92150 Suresnes, France
| | - Michel Félétou
- Unité de recherche et de découverte cardiovasculaire, Institut de recherches Servier, 11, rue des Moulineaux, 92150 Suresnes, France
| |
Collapse
|
80
|
No evidence for a local renin-angiotensin system in liver mitochondria. Sci Rep 2014; 3:2467. [PMID: 23959064 PMCID: PMC3747509 DOI: 10.1038/srep02467] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 07/22/2013] [Indexed: 01/01/2023] Open
Abstract
The circulating, endocrine renin-angiotensin system (RAS) is important to circulatory homeostasis, while ubiquitous tissue and cellular RAS play diverse roles, including metabolic regulation. Indeed, inhibition of RAS is associated with improved cellular oxidative capacity. Recently it has been suggested that an intra-mitochondrial RAS directly impacts on metabolism. Here we sought to rigorously explore this hypothesis. Radiolabelled ligand-binding and unbiased proteomic approaches were applied to purified mitochondrial sub-fractions from rat liver, and the impact of AngII on mitochondrial function assessed. Whilst high-affinity AngII binding sites were found in the mitochondria-associated membrane (MAM) fraction, no RAS components could be detected in purified mitochondria. Moreover, AngII had no effect on the function of isolated mitochondria at physiologically relevant concentrations. We thus found no evidence of endogenous mitochondrial AngII production, and conclude that the effects of AngII on cellular energy metabolism are not mediated through its direct binding to mitochondrial targets.
Collapse
|
81
|
Chappell MC, Marshall AC, Alzayadneh EM, Shaltout HA, Diz DI. Update on the Angiotensin converting enzyme 2-Angiotensin (1-7)-MAS receptor axis: fetal programing, sex differences, and intracellular pathways. Front Endocrinol (Lausanne) 2014; 4:201. [PMID: 24409169 PMCID: PMC3886117 DOI: 10.3389/fendo.2013.00201] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 12/18/2013] [Indexed: 12/12/2022] Open
Abstract
The renin-angiotensin-system (RAS) constitutes an important hormonal system in the physiological regulation of blood pressure. Indeed, dysregulation of the RAS may lead to the development of cardiovascular pathologies including kidney injury. Moreover, the blockade of this system by the inhibition of angiotensin converting enzyme (ACE) or antagonism of the angiotensin type 1 receptor (AT1R) constitutes an effective therapeutic regimen. It is now apparent with the identification of multiple components of the RAS that the system is comprised of different angiotensin peptides with diverse biological actions mediated by distinct receptor subtypes. The classic RAS can be defined as the ACE-Ang II-AT1R axis that promotes vasoconstriction, sodium retention, and other mechanisms to maintain blood pressure, as well as increased oxidative stress, fibrosis, cellular growth, and inflammation in pathological conditions. In contrast, the non-classical RAS composed of the ACE2-Ang-(1-7)-Mas receptor axis generally opposes the actions of a stimulated Ang II-AT1R axis through an increase in nitric oxide and prostaglandins and mediates vasodilation, natriuresis, diuresis, and oxidative stress. Thus, a reduced tone of the Ang-(1-7) system may contribute to these pathologies as well. Moreover, the non-classical RAS components may contribute to the effects of therapeutic blockade of the classical system to reduce blood pressure and attenuate various indices of renal injury. The review considers recent studies on the ACE2-Ang-(1-7)-Mas receptor axis regarding the precursor for Ang-(1-7), the intracellular expression and sex differences of this system, as well as an emerging role of the Ang1-(1-7) pathway in fetal programing events and cardiovascular dysfunction.
Collapse
Affiliation(s)
- Mark C. Chappell
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Allyson C. Marshall
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Ebaa M. Alzayadneh
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Hossam A. Shaltout
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, NC, USA
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
- Department of Pharmacology and Toxicology, School of Pharmacy, Alexandria University, Alexandria, Egypt
| | - Debra I. Diz
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, NC, USA
- *Correspondence: Debra I. Diz, The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157-1032, USA e-mail:
| |
Collapse
|
82
|
Deliu E, Brailoiu GC, Eguchi S, Hoffman NE, Rabinowitz JE, Tilley DG, Madesh M, Koch WJ, Brailoiu E. Direct evidence of intracrine angiotensin II signaling in neurons. Am J Physiol Cell Physiol 2014; 306:C736-44. [PMID: 24401846 DOI: 10.1152/ajpcell.00131.2013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The existence of a local renin-angiotensin system (RAS) in neurons was first postulated 40 years ago. Further studies indicated intraneuronal generation of ANG II. However, the function and signaling mechanisms of intraneuronal ANG II remained elusive. Since ANG II type 1 receptor (AT1R) is the major type of receptor mediating the effects of ANG II, we used intracellular microinjection and concurrent Ca(2+) and voltage imaging to examine the functionality of intracellular AT1R in neurons. We show that intracellular administration of ANG II produces a dose-dependent elevation of cytosolic Ca(2+) concentration ([Ca(2+)]i) in hypothalamic neurons that is sensitive to AT1R antagonism. Endolysosomal, but not Golgi apparatus, disruption prevents the effect of microinjected ANG II on [Ca(2+)]i. Additionally, the ANG II-induced Ca(2+) response is dependent on microautophagy and sensitive to inhibition of PLC or antagonism of inositol 1,4,5-trisphosphate receptors. Furthermore, intracellular application of ANG II produces AT1R-mediated depolarization of hypothalamic neurons, which is dependent on [Ca(2+)]i increase and on cation influx via transient receptor potential canonical channels. In summary, we provide evidence that intracellular ANG II activates endolysosomal AT1Rs in hypothalamic neurons. Our results point to the functionality of a novel intraneuronal angiotensinergic pathway, extending the current understanding of intracrine ANG II signaling.
Collapse
Affiliation(s)
- Elena Deliu
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, Pennsylvania
| | | | | | | | | | | | | | | | | |
Collapse
|
83
|
Skov J, Persson F, Frøkiær J, Christiansen JS. Tissue Renin-Angiotensin systems: a unifying hypothesis of metabolic disease. Front Endocrinol (Lausanne) 2014; 5:23. [PMID: 24592256 PMCID: PMC3938116 DOI: 10.3389/fendo.2014.00023] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 02/13/2014] [Indexed: 01/11/2023] Open
Abstract
The actions of angiotensin peptides are diverse and locally acting tissue renin-angiotensin systems (RAS) are present in almost all tissues of the body. An activated RAS strongly correlates to metabolic disease (e.g., diabetes) and its complications and blockers of RAS have been demonstrated to prevent diabetes in humans. Hyperglycemia, obesity, hypertension, and cortisol are well-known risk factors of metabolic disease and all stimulate tissue RAS whereas glucagon-like peptide-1, vitamin D, and aerobic exercise are inhibitors of tissue RAS and to some extent can prevent metabolic disease. Furthermore, an activated tissue RAS deteriorates the same risk factors creating a system with several positive feedback pathways. The primary effector hormone of the RAS, angiotensin II, stimulates reactive oxygen species, induces tissue damage, and can be associated to most diabetic complications. Based on these observations, we hypothesize that an activated tissue RAS is the principle cause of metabolic syndrome and type 2 diabetes, and additionally is mediating the majority of the metabolic complications. The involvement of positive feedback pathways may create a self-reinforcing state and explain why metabolic disease initiate and progress. The hypothesis plausibly unifies the major predictors of metabolic disease and places tissue RAS regulation in the center of metabolic control.
Collapse
Affiliation(s)
- Jeppe Skov
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
- Novo Nordisk A/S, Bagsvaerd, Denmark
- *Correspondence: Jeppe Skov, Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Norrebrogade 44, Aarhus DK-8000, Denmark e-mail:
| | | | - Jørgen Frøkiær
- Department of Clinical Physiology and Molecular Imaging, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | | |
Collapse
|
84
|
Yong QC, Thomas CM, Seqqat R, Chandel N, Baker KM, Kumar R. Angiotensin type 1a receptor-deficient mice develop diabetes-induced cardiac dysfunction, which is prevented by renin-angiotensin system inhibitors. Cardiovasc Diabetol 2013; 12:169. [PMID: 24215514 PMCID: PMC3830441 DOI: 10.1186/1475-2840-12-169] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 11/09/2013] [Indexed: 12/04/2022] Open
Abstract
Background Diabetes-induced organ damage is significantly associated with the activation of the renin-angiotensin system (RAS). Recently, several studies have demonstrated a change in the RAS from an extracellular to an intracellular system, in several cell types, in response to high ambient glucose levels. In cardiac myocytes, intracellular angiotensin (ANG) II synthesis and actions are ACE and AT1 independent, respectively. However, a role of this system in diabetes-induced organ damage is not clear. Methods To determine a role of the intracellular ANG II in diabetic cardiomyopathy, we induced diabetes using streptozotocin in AT1a receptor deficient (AT1a-KO) mice to exclude any effects of extracellular ANG II. Further, diabetic animals were treated with a renin inhibitor aliskiren, an ACE inhibitor benazeprilat, and an AT1 receptor blocker valsartan. Results AT1a-KO mice developed significant diastolic and systolic dysfunction following 10 wks of diabetes, as determined by echocardiography. All three drugs prevented the development of cardiac dysfunction in these animals, without affecting blood pressure or glucose levels. A significant down regulation of components of the kallikrein-kinin system (KKS) was observed in diabetic animals, which was largely prevented by benazeprilat and valsartan, while aliskiren normalized kininogen expression. Conclusions These data indicated that the AT1a receptor, thus extracellular ANG II, are not required for the development of diabetic cardiomyopathy. The KKS might contribute to the beneficial effects of benazeprilat and valsartan in diabetic cardiomyopathy. A role of intracellular ANG II is suggested by the inhibitory effects of aliskiren, which needs confirmation in future studies.
Collapse
Affiliation(s)
| | | | | | | | | | - Rajesh Kumar
- Division of Molecular Cardiology, Department of Medicine, Texas A&M Health Science Center, College of Medicine; Scott & White; Central Texas Veterans Health Care System, 1901 South First Street, Building 205, Temple, Texas 76504, USA.
| |
Collapse
|
85
|
Larrinaga G, Perez I, Ariz U, Sanz B, Beitia M, Errarte P, Etxezarraga C, Candenas ML, Pinto FM, López JI. Clinical impact of aspartyl aminopeptidase expression and activity in colorectal cancer. Transl Res 2013; 162:297-308. [PMID: 23948443 DOI: 10.1016/j.trsl.2013.07.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 07/09/2013] [Accepted: 07/23/2013] [Indexed: 12/12/2022]
Abstract
Aspartyl aminopeptidase (ASP; EC 3.4.11.21) is a widely distributed and abundant cytosolic enzyme that regulates bioactive peptides such as angiotensin II. It has been demonstrated that the expression and activity of this enzyme is modified in tissue and serum of patients with several types of cancer. However, the involvement of ASP in the neoplastic development and survival of patients with colorectal cancer (CRC) has not been analyzed to date. The activity and messenger RNA expression of ASP in tumor tissue (n = 71) and plasma (n = 40) of patients with CRC was analyzed prospectively using fluorometric and quantitative real-time polymerase chain reaction methods. Data obtained from tumor tissue were compared with those from the surrounding normal mucosa. Classic pathologic parameters (grade, stage, nodal invasion, distant metastases and perineural, lymphatic, and vascular invasion) were stratified following ASP data and analyzed for 5-year survival. ASP was upregulated in CRC tissues, and greater activity correlated significantly with the absence of lymph node metastases and with better overall survival. Inversely, greater plasmatic ASP activity was associated with worse overall and disease-free survival. Data suggest that ASP is involved in colorectal neoplasia and point to this enzyme as a potential useful diagnostic tool in clinical practice.
Collapse
Affiliation(s)
- Gorka Larrinaga
- Department of Nursing I, School of Nursing, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain; Department of Physiology, Faculty of Medicine and Dentistry, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain; BioCruces Health Research Institute, Barakaldo, Bizkaia, Spain.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
86
|
Aroor AR, DeMarco VG, Jia G, Sun Z, Nistala R, Meininger GA, Sowers JR. The role of tissue Renin-Angiotensin-aldosterone system in the development of endothelial dysfunction and arterial stiffness. Front Endocrinol (Lausanne) 2013; 4:161. [PMID: 24194732 PMCID: PMC3810594 DOI: 10.3389/fendo.2013.00161] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 10/11/2013] [Indexed: 12/16/2022] Open
Abstract
Epidemiological studies support the notion that arterial stiffness is an independent predictor of adverse cardiovascular events contributing significantly to systolic hypertension, impaired ventricular-arterial coupling and diastolic dysfunction, impairment in myocardial oxygen supply and demand, and progression of kidney disease. Although arterial stiffness is associated with aging, it is accelerated in the presence of obesity and diabetes. The prevalence of arterial stiffness parallels the increase of obesity that is occurring in epidemic proportions and is partly driven by a sedentary life style and consumption of a high fructose, high salt, and high fat western diet. Although the underlying mechanisms and mediators of arterial stiffness are not well understood, accumulating evidence supports the role of insulin resistance and endothelial dysfunction. The local tissue renin-angiotensin-aldosterone system (RAAS) in the vascular tissue and immune cells and perivascular adipose tissue is recognized as an important element involved in endothelial dysfunction which contributes significantly to arterial stiffness. Activation of vascular RAAS is seen in humans and animal models of obesity and diabetes, and associated with enhanced oxidative stress and inflammation in the vascular tissue. The cross talk between angiotensin and aldosterone underscores the importance of mineralocorticoid receptors in modulation of insulin resistance, decreased bioavailability of nitric oxide, endothelial dysfunction, and arterial stiffness. In addition, both innate and adaptive immunity are involved in this local tissue activation of RAAS. In this review we will attempt to present a unifying mechanism of how environmental and immunological factors are involved in this local tissue RAAS activation, and the role of this process in the development of endothelial dysfunction and arterial stiffness and targeting tissue RAAS activation.
Collapse
Affiliation(s)
- Annayya R. Aroor
- Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Missouri Columbia School of Medicine, Columbia, MO, USA
- Harry S. Truman Memorial Veterans Hospital, Columbia, MO, USA
| | - Vincent G. DeMarco
- Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Missouri Columbia School of Medicine, Columbia, MO, USA
- Harry S. Truman Memorial Veterans Hospital, Columbia, MO, USA
- Department of Medical Pharmacology and Physiology, University of Missouri Columbia School of Medicine, Columbia, MO, USA
| | - Guanghong Jia
- Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Missouri Columbia School of Medicine, Columbia, MO, USA
- Harry S. Truman Memorial Veterans Hospital, Columbia, MO, USA
| | - Zhe Sun
- Dalton Cardiovascular Research Center, Columbia, MO, USA
| | - Ravi Nistala
- Department of Internal Medicine, Division of Nephrology, University of Missouri Columbia School of Medicine, Columbia, MO, USA
| | - Gerald A. Meininger
- Department of Medical Pharmacology and Physiology, University of Missouri Columbia School of Medicine, Columbia, MO, USA
- Dalton Cardiovascular Research Center, Columbia, MO, USA
| | - James R. Sowers
- Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Missouri Columbia School of Medicine, Columbia, MO, USA
- Harry S. Truman Memorial Veterans Hospital, Columbia, MO, USA
- Department of Medical Pharmacology and Physiology, University of Missouri Columbia School of Medicine, Columbia, MO, USA
- Dalton Cardiovascular Research Center, Columbia, MO, USA
- *Correspondence: James R. Sowers, University of Missouri Columbia School of Medicine, D109 Diabetes Center HSC, One Hospital Drive, Columbia, MO 65212, USA e-mail:
| |
Collapse
|
87
|
The renin-angiotensin system in adipose tissue and its metabolic consequences during obesity. J Nutr Biochem 2013; 24:2003-15. [PMID: 24120291 DOI: 10.1016/j.jnutbio.2013.07.002] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 05/24/2013] [Accepted: 07/22/2013] [Indexed: 02/07/2023]
Abstract
Obesity is a worldwide disease that is accompanied by several metabolic abnormalities such as hypertension, hyperglycemia and dyslipidemia. The accelerated adipose tissue growth and fat cell hypertrophy during the onset of obesity precedes adipocyte dysfunction. One of the features of adipocyte dysfunction is dysregulated adipokine secretion, which leads to an imbalance of pro-inflammatory, pro-atherogenic versus anti-inflammatory, insulin-sensitizing adipokines. The production of renin-angiotensin system (RAS) components by adipocytes is exacerbated during obesity, contributing to the systemic RAS and its consequences. Increased adipose tissue RAS has been described in various models of diet-induced obesity (DIO) including fructose and high-fat feeding. Up-regulation of the adipose RAS by DIO promotes inflammation, lipogenesis and reactive oxygen species generation and impairs insulin signaling, all of which worsen the adipose environment. Consequently, the increase of circulating RAS, for which adipose tissue is partially responsible, represents a link between hypertension, insulin resistance in diabetes and inflammation during obesity. However, other nutrients and food components such as soy protein attenuate adipose RAS, decrease adiposity, and improve adipocyte functionality. Here, we review the molecular mechanisms by which adipose RAS modulates systemic RAS and how it is enhanced in obesity, which will explain the simultaneous development of metabolic syndrome alterations. Finally, dietary interventions that prevent obesity and adipocyte dysfunction will maintain normal RAS concentrations and effects, thus preventing metabolic diseases that are associated with RAS enhancement.
Collapse
|
88
|
Direct renin inhibition prevents cardiac dysfunction in a diabetic mouse model: comparison with an angiotensin receptor antagonist and angiotensin-converting enzyme inhibitor. Clin Sci (Lond) 2013; 124:529-41. [PMID: 23116220 DOI: 10.1042/cs20120448] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Hyperglycaemia up-regulates intracellular AngII (angiotensin II) production in cardiac myocytes, effects of which are blocked more effectively by renin inhibition than ARBs (angiotensin receptor blockers) or ACEis (angiotensin-converting enzyme inhibitors). In the present study, we determined whether renin inhibition is more effective at preventing diabetic cardiomyopathy than an ARB or ACEi. Diabetes was induced in adult mice for 10 weeks by STZ (streptozotocin). Diabetic mice were treated with insulin, aliskiren (a renin inhibitor), benazeprilat (an ACEi) or valsartan (an ARB) via subcutaneous mini-pumps. Significant impairment in diastolic and systolic cardiac functions was observed in diabetic mice, which was completely prevented by all three RAS (renin-angiotensin system) inhibitors. Hyperglycaemia significantly increased cardiac oxidative stress and circulating inflammatory cytokines, which were blocked by aliskiren and benazeprilat, whereas valsartan was partially effective. Diabetes increased cardiac PRR (prorenin receptor) expression and nuclear translocation of PLZF (promyelocytic zinc finger protein), which was completely prevented by aliskiren and valsartan, and partially by benazeprilat. Renin inhibition provided similar protection of cardiac function to ARBs and ACEis. Activation of PLZF by PRR represented a novel mechanism in diabetic cardiomyopathy. Differential effects of the three agents on oxidative stress, cytokines and PRR expression suggested subtle differences in their mechanisms of action.
Collapse
|
89
|
Auclair M, Vigouroux C, Boccara F, Capel E, Vigeral C, Guerci B, Lascols O, Capeau J, Caron-Debarle M. Peroxisome proliferator-activated receptor-γ mutations responsible for lipodystrophy with severe hypertension activate the cellular renin-angiotensin system. Arterioscler Thromb Vasc Biol 2013; 33:829-38. [PMID: 23393388 DOI: 10.1161/atvbaha.112.300962] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE Inactivating peroxisome proliferator-activated receptor-γ (PPARγ) mutations lead to a syndrome of familial partial lipodystrophy (FPLD3) associated with early-onset severe hypertension. PPARγ can repress the vascular renin-angiotensin system (RAS) and angiotensin II receptor 1 expression. We evaluated the relationships between PPARγ inactivation and cellular RAS using FPLD3 patients' cells and human vascular smooth muscle cells expressing mutant or wild-type PPARγ. Approach and Results- We identified 2 novel PPARG mutations, R165T and L339X, located in the DNA and ligand-binding domains of PPARγ, respectively in 4 patients from 2 FPLD3 families. In cultured skin fibroblasts and peripheral blood mononuclear cells from the 4 patients and healthy controls, we compared markers of RAS activation, oxidative stress, and inflammation, and tested the effect of modulators of PPARγ and angiotensin II receptor 1. We studied the impact of the 2 mutations on the transcriptional activity of PPARγ and on the vascular RAS in transfected human vascular smooth muscle cells. Systemic RAS was not altered in patients. However, RAS markers were overexpressed in patients' fibroblasts and peripheral blood mononuclear cells, as in vascular cells expressing mutant PPARγ. Angiotensin II-mediated mitogen-activated protein kinase activity increased in patients' fibroblasts, consistent with RAS constitutive activation. Patients' cells also displayed oxidative stress and inflammation. PPARγ activation and angiotensin II receptor 1 mRNA silencing reversed RAS overactivation, oxidative stress, and inflammation, arguing for a role of angiotensin II receptor 1 in these processes. CONCLUSIONS Two novel FPLD3-linked PPARG mutations are associated with a defective transrepression of cellular RAS leading to cellular dysfunction, which might contribute to the specific FPLD3-linked severe hypertension.
Collapse
Affiliation(s)
- Martine Auclair
- INSERM UMRS938, Centre de Recherche Saint Antoine, Paris, France
| | | | | | | | | | | | | | | | | |
Collapse
|
90
|
Suski M, Gębska A, Olszanecki R, Stachowicz A, Uracz D, Madej J, Korbut R. Influence of atorvastatin on angiotensin I metabolism in resting and TNF-α -activated rat vascular smooth muscle cells. J Renin Angiotensin Aldosterone Syst 2013; 15:378-83. [PMID: 23390189 DOI: 10.1177/1470320313475907] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
INTRODUCTION Vascular smooth muscle cells (VSMCs) are essential for maintaining vasculature homeostasis and function. By influence on its growth and activation both proinflammatory cytokines and peptides of the renin-angiotensin system (RAS) are potent regulators of VSMCs. Interestingly, angiotensin (Ang) II and Ang-(1-7) elicit opposite effects on VSMC activation, differentiation and proliferation. It has been suggested that statins, besides anti-inflammatory effects, may also modulate VSMC activation by their influence on the RAS. METHODS The effect of atorvastatin on Ang I metabolism in a culture of explanted rat VSMCs was examined by liquid chromatography-mass spectrometry (LC-MS); expression of mRNA of the main RAS enzymes in VSMC was assessed by real-time polymerase chain reaction (PCR). RESULTS In VSMC culture Ang-(1-7) was identified as a major product of Ang I metabolism. In this setting, TNF-α (1 ng/ml) caused a decrease in the conversion of Ang I to Ang-(1-7). This effect was accompanied by a decrease of mRNA expression of neutral endopeptidase (NEP) and angiotensin converting enzyme 2 (ACE2) and increase of mRNA of ACE. Interestingly, atorvastatin (3 μM) attenuated the effects of TNF-α on Ang-(1-7) production as well as reversed the influence of TNF-α on ACE and ACE2 expression. CONCLUSIONS Enhancement by atorvastatin of the ACE2/Ang-(1-7) axis in VSMCs could represent a new and beneficial mechanism on cardiovascular action of this widely used drug.
Collapse
Affiliation(s)
- Maciej Suski
- School of Medicine, Jagiellonian University, Poland
| | - Anna Gębska
- School of Medicine, Jagiellonian University, Poland
| | | | | | - Danuta Uracz
- School of Medicine, Jagiellonian University, Poland
| | - Jozef Madej
- School of Medicine, Jagiellonian University, Poland
| | | |
Collapse
|
91
|
Kumar R, Yong QC, Thomas CM. Do multiple nuclear factor kappa B activation mechanisms explain its varied effects in the heart? Ochsner J 2013; 13:157-165. [PMID: 23532211 PMCID: PMC3603179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
BACKGROUND Multiple studies have demonstrated the important role of the nuclear factor kappa B (NF-κB) in cardiac pathology. However, these studies' conclusions differ regarding whether NF-κB is protective or detrimental for heart function. This disagreement is not surprising considering the complexity of NF-κB signaling that involves multiple components and regulation at several steps. Furthermore, NF-κB is a pleiotropic transcription factor that receives signals from multiple pathways, including the renin-angiotensin system (RAS) and cytokines, 2 important modulators of cardiac remodeling. METHODS In this article, we review studies related to the role and mechanisms of NF-κB activation in the heart, particularly with regard to the RAS, inflammation, and diabetes. The objective of this review is to consolidate multiple, often contradictory, findings to develop a clear understanding of NF-κB signaling in the heart. CONCLUSIONS The studies we review demonstrate that NF-κB effects in the heart are mechanism specific and that NF-κB signaling is cyclical. Consequently, the timing of NF-κB measurement is critical, and studies focused on temporal changes in the NF-κB mechanism would help clarify its multiple roles in cardiac pathophysiology.
Collapse
Affiliation(s)
- Rajesh Kumar
- Division of Molecular Cardiology, College of Medicine, Texas A&M Health Science Center, Scott & White Healthcare, and Central Texas Veterans Health Care System, Temple, TX
| | - Qian Chen Yong
- Division of Molecular Cardiology, College of Medicine, Texas A&M Health Science Center, Scott & White Healthcare, and Central Texas Veterans Health Care System, Temple, TX
| | - Candice M. Thomas
- Division of Molecular Cardiology, College of Medicine, Texas A&M Health Science Center, Scott & White Healthcare, and Central Texas Veterans Health Care System, Temple, TX
| |
Collapse
|
92
|
Abadir PM, Walston JD, Carey RM. Subcellular characteristics of functional intracellular renin-angiotensin systems. Peptides 2012; 38:437-45. [PMID: 23032352 PMCID: PMC3770295 DOI: 10.1016/j.peptides.2012.09.016] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 09/14/2012] [Indexed: 02/06/2023]
Abstract
The renin-angiotensin system (RAS) is now regarded as an integral component in not only the development of hypertension, but also in physiologic and pathophysiologic mechanisms in multiple tissues and chronic disease states. While many of the endocrine (circulating), paracrine (cell-to-different cell) and autacrine (cell-to-same cell) effects of the RAS are believed to be mediated through the canonical extracellular RAS, a complete, independent and differentially regulated intracellular RAS (iRAS) has also been proposed. Angiotensinogen, the enzymes renin and angiotensin-converting enzyme (ACE) and the angiotensin peptides can all be synthesized and retained intracellularly. Angiotensin receptors (types I and 2) are also abundant intracellularly mainly at the nuclear and mitochondrial levels. The aim of this review is to focus on the most recent information concerning the subcellular localization, distribution and functions of the iRAS and to discuss the potential consequences of activation of the subcellular RAS on different organ systems.
Collapse
Affiliation(s)
- Peter M. Abadir
- Division of Geriatric Medicine and Gerontology, Biology of Healthy Aging Program, Johns Hopkins University School of Medicine, Baltimore, MD 21224, United States
| | - Jeremy D. Walston
- Division of Geriatric Medicine and Gerontology, Biology of Healthy Aging Program, Johns Hopkins University School of Medicine, Baltimore, MD 21224, United States
| | - Robert M. Carey
- Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA 22908, United States
- Corresponding author at: P.O. Box 801414, University of Virginia Health System, Charlottesville, VA 22908-1414, United States. Tel.: +1 434 924 5510; fax: +1 434 982 3626. (R.M. Carey)
| |
Collapse
|