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Vesce F, Battisti C, Crudo M. The Inflammatory Cytokine Imbalance for Miscarriage, Pregnancy Loss and COVID-19 Pneumonia. Front Immunol 2022; 13:861245. [PMID: 35359975 PMCID: PMC8961687 DOI: 10.3389/fimmu.2022.861245] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 02/17/2022] [Indexed: 12/27/2022] Open
Abstract
Pregnancy can be defined a vascular event upon endocrine control. In the human hemo-chorial placentation the chorionic villi penetrate the wall of the uterine spiral arteries, to provide increasing amounts of nutrients and oxygen for optimal fetal growth. In any physiological pregnancy the natural maternal response is of a Th1 inflammatory type, aimed at avoiding blood loss through the arteriolar wall openings. The control of the vascular function, during gestation as in any other condition, is achieved through the action of two main types of prostanoids: prostaglandin E2 and thromboxane on the one hand (for vasoconstriction and coagulation), prostacyclin on the other (for vasodilation and blood fluidification). The control of the maternal immune response is upon the responsibility of the fetus itself. Indeed, the chorionic villi are able to counteract the natural maternal response, thus changing the inflammatory Th1 type into the anti-inflammatory Th2. Clinical and experimental research in the past half century address to inflammation as the leading cause of abortion, pregnancy loss, premature delivery and related pulmonary, cerebral, intestinal fetal syndromes. Increased level of Interleukin 6, Interleukin 1-beta, Tumor Necrosis Factor-alfa, Interferon-gamma, are some among the well-known markers of gestational inflammation. On the other side, COVID-19 pneumonia is a result of extensive inflammation induced by viral replication within the cells of the respiratory tract. As it may happen in the uterine arteries in the absence of an effective fetal control, viral pneumonia triggers pulmonary vascular coagulation. The cytokines involved in the process are the same as those in gestational inflammation. As the fetus breathes throughout the placenta, fetal death from placental thrombosis is similar to adult death from pulmonary thrombosis. Preventing and counteracting inflammation is mandatory in both conditions. The most relevant literature dealing with the above-mentioned concepts is reviewed in the present article.
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Banerjee D, Winocour P, Chowdhury TA, De P, Wahba M, Montero R, Fogarty D, Frankel AH, Karalliedde J, Mark PB, Patel DC, Pokrajac A, Sharif A, Zac-Varghese S, Bain S, Dasgupta I. Management of hypertension and renin-angiotensin-aldosterone system blockade in adults with diabetic kidney disease: Association of British Clinical Diabetologists and the Renal Association UK guideline update 2021. BMC Nephrol 2022; 23:9. [PMID: 34979961 PMCID: PMC8722287 DOI: 10.1186/s12882-021-02587-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 10/28/2021] [Indexed: 12/31/2022] Open
Abstract
People with type 1 and type 2 diabetes are at risk of developing progressive chronic kidney disease (CKD) and end-stage kidney failure. Hypertension is a major, reversible risk factor in people with diabetes for development of albuminuria, impaired kidney function, end-stage kidney disease and cardiovascular disease. Blood pressure control has been shown to be beneficial in people with diabetes in slowing progression of kidney disease and reducing cardiovascular events. However, randomised controlled trial evidence differs in type 1 and type 2 diabetes and different stages of CKD in terms of target blood pressure. Activation of the renin-angiotensin-aldosterone system (RAAS) is an important mechanism for the development and progression of CKD and cardiovascular disease. Randomised trials demonstrate that RAAS blockade is effective in preventing/ slowing progression of CKD and reducing cardiovascular events in people with type 1 and type 2 diabetes, albeit differently according to the stage of CKD. Emerging therapy with sodium glucose cotransporter-2 (SGLT-2) inhibitors, non-steroidal selective mineralocorticoid antagonists and endothelin-A receptor antagonists have been shown in randomised trials to lower blood pressure and further reduce the risk of progression of CKD and cardiovascular disease in people with type 2 diabetes. This guideline reviews the current evidence and makes recommendations about blood pressure control and the use of RAAS-blocking agents in different stages of CKD in people with both type 1 and type 2 diabetes.
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Affiliation(s)
- D Banerjee
- St George's Hospitals NHS Foundation Trust, London, UK
| | - P Winocour
- ENHIDE, East and North Herts NHS Trust, Stevenage, UK
| | | | - P De
- City Hospital, Birmingham, UK
| | - M Wahba
- St Helier Hospital, Carshalton, UK
| | | | - D Fogarty
- Belfast Health and Social Care Trust, Belfast, UK
| | - A H Frankel
- Imperial College Healthcare NHS Trust, London, UK
| | | | - P B Mark
- University of Glasgow, Glasgow, UK
| | - D C Patel
- Royal Free London NHS Foundation Trust, London, UK
| | - A Pokrajac
- West Hertfordshire Hospitals, London, UK
| | - A Sharif
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | | | - S Bain
- Swansea University, Swansea, UK
| | - I Dasgupta
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
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3
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Abstract
Coronavirus disease 2019 (COVID-19) is a serious respiratory disease mediated by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The worldwide spread of COVID-19 has caused millions of confirmed cases and morbidity, and the crisis has greatly affected global economy and daily life and changed our attitudes towards life. The reproductive system, as a potential target, is at a high risk of SARS-CoV-2 infection, and females are more vulnerable to viral infection compared with males. Therefore, female fertility and associated reproductive health care in the COVID-19 era need more attention. This review summarises the mechanism of SARS-CoV-2 infection in the female reproductive system and discusses the impact of the COVID-19 crisis on female fertility. Studies have proven that COVID-19 might affect female fertility and interfere with assisted reproductive technology procedures. The side effects of vaccines against the virus on ovarian reserve and pregnancy have not yet been well investigated. In the future, the female fertility after SARS-CoV-2 infection and vaccination needs more attention because of the uncertainty of COVID-19.
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Avsar T, Yigit BN, Turan G, Altunsu D, Calis S, Kurt B, Kilic T, Yavuz Ergun M, Durdagi S, Acar M. Development of imidazolone based angiotensin II receptor type I inhibitor small molecule as a chemotherapeutic agent for cell cycle inhibition. ALL LIFE 2021. [DOI: 10.1080/26895293.2021.1954098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Timucin Avsar
- Department of Medical Biology, School of Medicine, Bahcesehir University, Istanbul, Turkey
- Neuroscience Program, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
| | - Berfu Nur Yigit
- Neuroscience Program, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
| | - Gizem Turan
- Neuroscience Program, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
| | - Deniz Altunsu
- Neuroscience Program, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
| | - Seyma Calis
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Graduate School of Science, Engineering and Technology, Molecular Biology, Genetics and Biotechnology Graduate Program, Istanbul Technical University, Istanbul, Turkey
| | - Bahar Kurt
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
| | - Turker Kilic
- Neuroscience Program, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Department of Neurosurgery, School of Medicine, Bahcesehir University, Istanbul, Turkey
| | - M. Yavuz Ergun
- Department of Chemistry, Dokuz Eylul University, Izmir, Turkey
| | - Serdar Durdagi
- Neuroscience Program, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
- Department of Biophysics, Computational Biology and Molecular Simulations Laboratory, School of Medicine, Bahcesehir University Istanbul, Turkey
| | - Melih Acar
- Department of Medical Biology, School of Medicine, Bahcesehir University, Istanbul, Turkey
- Neuroscience Laboratory, Health Sciences Institute, Bahcesehir University, Istanbul, Turkey
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5
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Jing Y, Run-Qian L, Hao-Ran W, Hao-Ran C, Ya-Bin L, Yang G, Fei C. Potential influence of COVID-19/ACE2 on the female reproductive system. Mol Hum Reprod 2020; 26:367-373. [PMID: 32365180 PMCID: PMC7239105 DOI: 10.1093/molehr/gaaa030] [Citation(s) in RCA: 222] [Impact Index Per Article: 55.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 04/26/2020] [Accepted: 05/02/2020] [Indexed: 12/19/2022] Open
Abstract
The 2019 novel coronavirus (2019-nCoV) appeared in December 2019 and then spread throughout the world rapidly. The virus invades the target cell by binding to angiotensin-converting enzyme (ACE) 2 and modulates the expression of ACE2 in host cells. ACE2, a pivotal component of the renin-angiotensin system, exerts its physiological functions by modulating the levels of angiotensin II (Ang II) and Ang-(1-7). We reviewed the literature that reported the distribution and function of ACE2 in the female reproductive system, hoping to clarify the potential harm of 2019-nCoV to female fertility. The available evidence suggests that ACE2 is widely expressed in the ovary, uterus, vagina and placenta. Therefore, we believe that apart from droplets and contact transmission, the possibility of mother-to-child and sexual transmission also exists. Ang II, ACE2 and Ang-(1-7) regulate follicle development and ovulation, modulate luteal angiogenesis and degeneration, and also influence the regular changes in endometrial tissue and embryo development. Taking these functions into account, 2019-nCoV may disturb the female reproductive functions through regulating ACE2.
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Affiliation(s)
- Yan Jing
- Department of Physiology, Jining Medical University, 272067 Jining, China
| | - Li Run-Qian
- Department of Physiology, Jining Medical University, 272067 Jining, China
| | - Wang Hao-Ran
- Department of Physiology, Jining Medical University, 272067 Jining, China
| | - Chen Hao-Ran
- Department of Physiology, Jining Medical University, 272067 Jining, China
| | - Liu Ya-Bin
- Department of Physiology, Jining Medical University, 272067 Jining, China
| | - Gao Yang
- Department of Physiology, Jining Medical University, 272067 Jining, China
| | - Chen Fei
- Department of Physiology, Jining Medical University, 272067 Jining, China
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Angiotensin receptor 1 blockade reduces secretion of inflammation associated cytokines from cultured human carotid atheroma and vascular cells in association with reduced extracellular signal regulated kinase expression and activation. Atherosclerosis 2014; 236:108-15. [DOI: 10.1016/j.atherosclerosis.2014.06.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 05/21/2014] [Accepted: 06/11/2014] [Indexed: 11/21/2022]
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Lipid rafts are required for signal transduction by angiotensin II receptor type 1 in neonatal glomerular mesangial cells. Exp Cell Res 2014; 324:92-104. [PMID: 24662198 DOI: 10.1016/j.yexcr.2014.03.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 03/10/2014] [Accepted: 03/13/2014] [Indexed: 11/24/2022]
Abstract
Angiotensin II (ANG-II) receptors (AGTRs) contribute to renal physiology and pathophysiology, but the underlying mechanisms that regulate AGTR function in glomerular mesangium are poorly understood. Here, we show that AGTR1 is the functional AGTR subtype expressed in neonatal pig glomerular mesangial cells (GMCs). Cyclodextrin (CDX)-mediated cholesterol depletion attenuated cell surface AGTR1 protein expression and ANG-II-induced intracellular Ca(2+) ([Ca(2+)]i) elevation in the cells. The COOH-terminus of porcine AGTR1 contains a caveolin (CAV)-binding motif. However, neonatal GMCs express CAV-1, but not CAV-2 and CAV-3. Colocalization and in situ proximity ligation assay detected an association between endogenous AGTR1 and CAV-1 in the cells. A synthetic peptide corresponding to the CAV-1 scaffolding domain (CSD) sequence also reduced ANG-II-induced [Ca(2+)]i elevation in the cells. Real-time imaging of cell growth revealed that ANG-II stimulates neonatal GMC proliferation. ANG-II-induced GMC growth was attenuated by EMD 66684, an AGTR1 antagonist; BAPTA, a [Ca(2+)]i chelator; KN-93, a Ca(2+)/calmodulin-dependent protein kinase II inhibitor; CDX; and a CSD peptide, but not PD 123319, a selective AGTR2 antagonist. Collectively, our data demonstrate [Ca(2+)]i-dependent proliferative effect of ANG-II and highlight a critical role for lipid raft microdomains in AGTR1-mediated signal transduction in neonatal GMCs.
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Bi J, Contag SA, Carey LC, Tang L, Valego NK, Chappell MC, Rose JC. Antenatal betamethasone exposure alters renal responses to angiotensin-(1-7) in uninephrectomized adult male sheep. J Renin Angiotensin Aldosterone Syst 2013; 14:290-8. [PMID: 23161144 PMCID: PMC4020597 DOI: 10.1177/1470320312465217] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Antenatal corticosteroid exposure reduces renal function and alters the intrarenal renin-angiotensin system to favor angiotensin activation of angiotensin type 1 receptor (AT1R) mediated responses in ovine offspring. This study aimed to assess whether antenatal steroid exposure would affect renal responses to the direct intrarenal infusion of angiotensin-(1-7) in rams and the angiotensin receptors involved in mediating responses to the peptide. Adult, uninephrectomized rams exposed to either betamethasone or vehicle before birth received intrarenal angiotensin-(1-7) infusions (1 ng/kg/min) alone or in combination with antagonists to angiotensin receptors for 3 h. Basal sodium excretion (UNa) was significantly lower and mean arterial pressure was significantly higher in betamethasone- compared to the vehicle-treated sheep. Angiotensin-(1-7) decreased UNa more in betamethasone- than in vehicle-treated sheep. Candesartan reversed the response to angiotensin-(1-7) but D-Ala(7)-angiotensin-(1-7) did not. Angiotensin-(1-7) infusion decreased effective renal plasma flow in both groups to a similar extent and the response was reversed by candesartan, but was not blocked by D-Ala(7)-angiotensin-(1-7). Glomerular filtration rate increased significantly in both groups after 3 h infusion of angiotensin-(1-7) plus candesartan. These results suggest that antenatal exposure to a clinically relevant dose of betamethasone impairs renal function in rams. Moreover, angiotensin-(1-7) appears capable of activating the AT1R in uninephrectomized rams.
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Affiliation(s)
- Jianli Bi
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
- The Center of Research for Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
| | - Stephen A. Contag
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
| | - Luke C. Carey
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
- The Center of Research for Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
| | - Lijun Tang
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
- The Center of Research for Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
| | - Nancy K. Valego
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
- The Center of Research for Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
| | - Mark C. Chappell
- Hypertension and Vascular Disease Center, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
| | - James C. Rose
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
- The Center of Research for Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, 27157
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10
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Liao TD, Yang XP, Liu YH, Shesely EG, Cavasin MA, Kuziel WA, Pagano PJ, Carretero OA. Role of inflammation in the development of renal damage and dysfunction in angiotensin II-induced hypertension. Hypertension 2008; 52:256-63. [PMID: 18541733 DOI: 10.1161/hypertensionaha.108.112706] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Angiotensin II (Ang II)-induced hypertension is associated with an inflammatory response that may contribute to the development of target organ damage. We tested the hypothesis that, in Ang II-induced hypertension, CC chemokine receptor 2 (CCR2) activation plays an important role in the development of renal fibrosis, damage, and dysfunction by causing oxidative stress, macrophage infiltration, and cell proliferation. To test this hypothesis, we used CCR2 knockout mice (CCR2-/-). The natural ligand of CCR2 is monocyte chemoattractant protein-1, a chemokine important for macrophage recruitment and activation. CCR2-/- and age-matched wild-type (CCR2+/+) C57BL/6J mice were infused continuously with either Ang II (5.2 ng/10 g per minute) or vehicle via osmotic minipumps for 2 or 4 weeks. Ang II infusion caused similar increases in systolic blood pressure and left ventricular hypertrophy in both strains of mice. However, in CCR2-/- mice with Ang II-induced hypertension, oxidative stress, macrophage infiltration, albuminuria, and renal damage were significantly decreased, and glomerular filtration rate was significantly higher than in CCR2+/+ mice. We concluded that, in Ang II-induced hypertension, CCR2 activation plays an important role in the development of hypertensive nephropathy via increased oxidative stress and inflammation.
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Affiliation(s)
- Tang-Dong Liao
- Hypertension and Vascular Research Division, Henry Ford Hospital, 2799 West Grand Blvd, Detroit MI 48202-2689, USA
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11
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Ding G, Zhang A, Huang S, Pan X, Zhen G, Chen R, Yang T. ANG II induces c-Jun NH2-terminal kinase activation and proliferation of human mesangial cells via redox-sensitive transactivation of the EGFR. Am J Physiol Renal Physiol 2007; 293:F1889-97. [PMID: 17881465 DOI: 10.1152/ajprenal.00112.2007] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We previously showed that ANG II induces mesangial cell (MC) proliferation via the JNK-activator protein-1 pathway. The present study attempted to determine the upstream mediators of JNK activation, with emphasis on reactive oxygen species (ROS) and the epidermal growth factor (EGF) receptor (EGFR). In cultured human MCs (HMCs), as early as 3 min, ANG II time dependently increased intracellular ROS production, which was sensitive to 10 microM diphenyleneiodonium sulfate and 500 microM apocynin, two structurally distinct NADPH oxidase inhibitors. In contrast, inhibitors of other oxidant-producing enzymes, including the mitochondrial complex I inhibitor rotenone, the xanthine oxidase inhibitor allopurinol, the cyclooxygenase inhibitor indomethacin, the lipoxygenase inhibitor nordihydroguiaretic acid, the cytochrome P-450 oxygenase inhibitor ketoconazole, and the nitric oxide synthase inhibitor N(G)-nitro-l-arginine methyl ester, were without effect. ANG II-induced ROS generation was inhibited by the angiotensin type 1 receptor antagonist losartan (10 muM) but not the angiotensin type 2 receptor antagonist PD-123319 (10 microM). ANG II induced translocation of p47(phox) and p67(phox) from the cytosol to the membrane. The antioxidants almost abolished the ANG II mitogenic response, as assessed by [(3)H]thymidine incorporation and cell number, associated with a remarkable blockade of the activation of EGFR (90% inhibition) and JNK (83% inhibition). The EGFR inhibitor AG-1478 was able to mimic the effect of antioxidants, in that it inhibited the mitogenic response and the JNK activation following ANG II treatment. Together, these data suggest that the ROS-EGFR-JNK pathway is involved in transducing the proliferative effect of ANG II in cultured HMCs.
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MESH Headings
- Acridines
- Angiotensin II/biosynthesis
- Angiotensin II/pharmacology
- Angiotensin II Type 1 Receptor Blockers/pharmacology
- Blotting, Western
- Cell Count
- Cell Proliferation/drug effects
- Cells, Cultured
- DNA/biosynthesis
- DNA/genetics
- Enzyme Activation/drug effects
- ErbB Receptors/biosynthesis
- ErbB Receptors/genetics
- Glomerular Mesangium/cytology
- Glomerular Mesangium/drug effects
- Glomerular Mesangium/enzymology
- Humans
- JNK Mitogen-Activated Protein Kinases/metabolism
- Luminescence
- NADPH Oxidases/metabolism
- Oxidation-Reduction
- Reactive Oxygen Species
- Receptor, Angiotensin, Type 1/biosynthesis
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 2/biosynthesis
- Receptor, Angiotensin, Type 2/genetics
- Transcriptional Activation/drug effects
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Affiliation(s)
- Guixia Ding
- Center of Pediatric Nephrology, Nanjing Childern's Hospital, Nanjing Medical Univ., Nanjing 210029, China
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12
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Liu N, Shimizu S, Ito-Ihara T, Takagi K, Kita T, Ono T. Angiotensin II receptor blockade ameliorates mesangioproliferative glomerulonephritis in rats through suppression of CTGF and PAI-1, independently of the coagulation system. Nephron Clin Pract 2006; 105:e65-74. [PMID: 17199095 DOI: 10.1159/000098321] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Accepted: 10/04/2006] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Previously we observed that the coagulation system promotes matrix protein accumulation through transforming growth factor (TGF)-beta and connective tissue growth factor (CTGF) expression in rat mesangioproliferative glomerulonephritis (MsPGN). Angiotensin II receptor blockers (ARBs) are known to suppress matrix accumulation in experimental MsPGN. In the present study, we investigated whether ARB suppresses MsPGN through inhibition of these profibrotic cytokines, and in relation to coagulation and fibrinolytic systems. METHODS MsPGN was induced in Wistar rats by intravenous injection of anti-Thy-1.1 monoclonal antibody, OX-7. As an ARB, olmesartan was orally administered in rat feed from the day of OX-7 injection (day 0) to day 8, when rats were sacrificed and kidney specimens were collected. The degrees of cellular proliferation, matrix production, coagulation factors, and inhibitory factor of fibrinolysis were evaluated. RESULTS Although blood pressure did not change in the normal, disease control, or treatment groups, the amount of urinary protein was significantly decreased in the ARB-treated groups, compared with the disease control group (p < 0.05). alpha-Smooth muscle actin expression was suppressed significantly in the treatment groups (p < 0.001). Blue-staining areas of trichrome, the number of proliferating cell nuclear antigen (PCNA)- or ED-1-positive cells, fibronectin and plasminogen activator inhibitor type 1 in glomeruli significantly decreased in the treatment groups (p < 0.05, respectively); however, fibrin-related antigen and factor V depositions were not suppressed in the treatment groups. CONCLUSIONS These results suggest that the ARB drug would ameliorate MsPGN in vivo, at least partly through CTGF and plasminogen activator inhibitor type 1 suppression, and independently of the local coagulation system in glomeruli.
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Affiliation(s)
- Ning Liu
- Clinical Pharmacology & Therapeutics, University of Shizuoka School of Pharmaceutical Sciences, Shizuoka, Japan
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13
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Minutolo R, Balletta MM, Catapano F, Chiodini P, Tirino G, Zamboli P, Fuiano G, Russo D, Marotta P, Iodice C, Conte G, De Nicola L. Mesangial hypercellularity predicts antiproteinuric response to dual blockade of RAS in primary glomerulonephritis. Kidney Int 2006; 70:1170-6. [PMID: 16883322 DOI: 10.1038/sj.ki.5001732] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The greater antiproteinuric efficacy of converting enzyme inhibitor and angiotensin II receptor blocker combination (CEI+ARB), versus monotherapy with either drug, is not a consistent finding. We evaluated the clinicopathologic predictors of response to CEI+ARB in 43 patients with primary glomerulonephritis (GN), never treated with immunosuppressive drugs, and with persistent proteinuria after CEI alone. Main histological lesions were analyzed by obtaining on 557 glomeruli and 165 arteries formal score of mesangial cellularity, glomerulosclerosis, tubulointerstitial damage, mononuclear cell infiltration, arteriosclerosis, and arteriolar hyalinosis. Duration of CEI and CEI+ARB therapy was similar (4.7+/-2.4 and 5.0+/-1.5 months). Proteinuria (g/day) decreased from 3.5+/-2.9 to 2.4+/-2.3 after CEI, and to 1.5+/-1.3 after CEI+ARB (P<0.0001). Reduction of proteinuria after CEI+ARB was greater in proliferative versus non-proliferative GN (-63.3+/-23.4 versus 42.4+/-23.7%, respectively; P=0.006). When patients were categorized in responders and non-responders to CEI+ARB, no difference between the two groups was detected in any demographic or clinical variable, whereas histology showed in responders a greater prevalence of proliferative GN (71.4 versus 31.8%, P=0.009) and higher score of mesangial cellularity (1.76+/-0.53 versus 1.20+/-0.22, P<0.0001). At multiple regression analysis (r(2)=0.476, P=0.001), response to CEI+ARB resulted independently related only to mesangial cellularity (P<0.0001). In conclusion, the best independent predictor of antiproteinuric efficacy of CEI+ARB in patients with primary GN is the degree of mesangial cellularity. This finding supports the experimental evidence that high angiotensin II contributes to proliferation of mesangial cells.
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Affiliation(s)
- R Minutolo
- Nephrology Division, Second University of Naples - SMdP Incurabili Hospital-ASL Na1, Naples, Italy
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14
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Rusafa Neto E, Vianna PTG, Viero RM, Módolo NSP, Ganem EM, Braz RC, Castiglia YMM. Influence of S(+)-ketamine analgesia in renal intraoperative ischemia: histological study in rats. Acta Cir Bras 2006; 21:242-6. [PMID: 16862345 DOI: 10.1590/s0102-86502006000400010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Accepted: 03/23/2006] [Indexed: 01/16/2023] Open
Abstract
PURPOSE: To study in rats the effect of S(+)ketamine on the renal histology after intraoperative hemorrhage. METHODS: Twenty male Wistar rats, anesthetized with sodium pentobarbital, were randomly divided in 2 groups: G1 - control (n=l0) and G2 - S(+)-ketamine (n=10), both submitted to arterial hemorrhage of 30% of volemia in 3 moments (10% each 10 min) 60 min after anesthesia. G2 received S(+)-ketamine, 15 mg. kg-1, i.m., 5 min after anesthesia and 55 min before the 1st hemorrhage moment (Ml). Medium arterial pressure (MAP), rectal temperature (T) and heart rate were monitored. The animals were sacrificed in M4, 30 min after the 3rd hemorrhage moment (M3) and the kidneys and blood collected from hemorrhage were utilized for histological study and hematocrit (Ht) determination. RESULTS: There were significant reduction of MAP, T, and Ht. The histological study verified G1 = G2 for tubular dilation, congestion, and necrosis. The total score addition were significant1y different and G2 > G 1. CONCLUSION: Hemorrhage and hypotension determined changes in kidney histology. The rise in catecholamine blood concentration probably was the cause of S(+)-ketamine-induced higher score of histological changes.
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Affiliation(s)
- Eloy Rusafa Neto
- Department of Anesthesiology, College of Medicine of Botucatu, São Paulo State University, 18618-970 Botucatu, SP, Brazil
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Ray PE, Soler-García AA, Xu L, Soderland C, Blumenthal R, Puri A. Fusion of HIV-1 envelope-expressing cells to human glomerular endothelial cells through an CXCR4-mediated mechanism. Pediatr Nephrol 2005; 20:1401-9. [PMID: 16047221 DOI: 10.1007/s00467-005-1950-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2004] [Revised: 03/10/2005] [Accepted: 03/15/2005] [Indexed: 11/25/2022]
Abstract
A central question in the pathogenesis of HIV-associated thrombotic microangiopathic (HIV-TMA) lesions is whether the HIV-1 envelope glycoprotein (HIV-1 Env) can interact directly with human glomerular endothelial cells (HGECs) through specific HIV-1 co-receptors. The goal of this study was to determine whether cultured primary HGECs express significant levels of the major HIV-1 co-receptors CD4, CXCR4, and/or CCR5 to allow fusion interactions with HIV-1. The expression of CD4, CXCR-4 and CCR-5 was assessed in cultured HGECs by reverse transcriptase-polymerase chain reaction (RT-PCR) and flow cytometry using specific antibodies. The HIV-1 Env-mediated membrane fusion of target glomerular cells was evaluated by a fluorescent dye transfer-based cell-cell fusion microscopic method. HGECs express CXCR4 mRNA and protein as determined by RT-PCR and immunostaining with phycoerythrin-conjugated anti-CXCR4 Mab 12G5. CD4 and CCR5 were not detected in HGECs, either by RT-PCR or by surface immunostaining with specific antibodies. Incubation of HGECs with cells expressing a CD4-independent envelope strain (HIV-1IIIB-8x) and the CD4-dependent envelope strain (HIV-1IIIB) resulted in transfer of fluorescent dyes of approximately 20% after 8-16 h incubation at 37 degrees C. Incubation in the presence of inhibitors (C34, which blocks six-helix bundle formation, and AMD3100, which interacts with CXCR4) reduced dye transfer by 60%-80%, confirming that the dye transfer was specific with respect to gp120-gp41-mediated fusion. Cultured primary HGECs express CXCR4 but not CD4 or CCR5. The ability of HGECs to promote fusion by a CD4-independent HIV-1 envelope glycoprotein suggests that these cells may become a potential direct target of certain HIV-1 isolates.
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Affiliation(s)
- Patricio E Ray
- Division of Nephrology and Center for Genetic Medicine, Children's Research Institute, Children's National Medical Center, 111 Michigan Avenue NW, Washington, DC 20010, USA.
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16
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Zhang A, Ding G, Huang S, Wu Y, Pan X, Guan X, Chen R, Yang T. c-Jun NH2-terminal kinase mediation of angiotensin II-induced proliferation of human mesangial cells. Am J Physiol Renal Physiol 2005; 288:F1118-24. [PMID: 15701817 DOI: 10.1152/ajprenal.00220.2004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Angiotensin II (ANG II) has been shown to activate c-Jun NH2-terminal kinase (JNK) in cultured mesangial cells, but the functional implication of this phenomenon remains to be determined, largely due to the lack of an effective approach to block JNK. Therefore, the present study was carried out to examine whether JNK is involved in ANG II-induced cell proliferation in cultured human mesangial cells (HMCs) with the use of a newly developed JNK-selective blocker, SP-600125. Within minutes, treatment with 100 nM ANG II activated all three members of MAP kinase family, including extracellular signal-regulated protein kinase (Erk) 1/2, JNK, and p38 in cultured HMCs, as assessed by immunoblotting detection of phosphorylation of MAP kinases. ANG II-dependent activation of JNK was further confirmed by detection of increased phosphorylation and transcription activity of c-Jun after the ANG II treatment. SP-600125 ranging from 5 to 10 μM almost completely abolished the activation of JNK by ANG II without affecting the activities of Erk1/2 and p38. After treatment with 100 ng ANG II, there was a steady increase in [3H]thymidine incorporation that was blocked by SP-60025 in a dose- and time-dependent manner. Similarly, SP-600125 dose dependently reduced the ANG II-induced increase in cell number. The antiproliferative effect of SP-60025 was further determined by cell-cycle analysis with flow cytometry. Twenty-four hours after ANG II treatment, 50% of the quiescent HMCs (G0/G1) progressed into the S phase, and the cell cycle progression was almost completely prevented in the presence of SP-60025. Our data suggest that JNK mediates the proliferative effect of ANG II in cultured HMCs and thus represents a novel therapeutic target for treatment of chronic renal diseases.
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Affiliation(s)
- Aihua Zhang
- Department of Nephrology, Nanjing Children's Hospital, China
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Chen K, Carey LC, Liu J, Valego NK, Tatter SB, Rose JC. The effect of hypothalamo-pituitary disconnection on the renin-angiotensin system in the late-gestation fetal sheep. Am J Physiol Regul Integr Comp Physiol 2004; 288:R1279-87. [PMID: 15604301 DOI: 10.1152/ajpregu.00560.2004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The activity of the renin-angiotensin system (RAS) increases significantly in the late-gestation fetal sheep. Fetal cortisol is also increased during this time, and it is thought that the increase in cortisol may modulate the RAS changes. Previous studies have examined the effects of cortisol infusion on RAS activity, but the effects of blocking the peripartum increase in cortisol concentrations on the developmental changes in the RAS are not known. Therefore, we utilized the technique of hypothalamic-pituitary disconnection (HPD), which prevents the cortisol surge from occurring, to investigate the importance of the late-gestation increase in cortisol on the ontogenic changes in RAS activity. HPD of fetal sheep was performed at 120 days of gestational age (dGA), and fetuses were delivered between 135 and 139 dGA. Control fetuses were sham operated. HPD blocked the late-gestation cortisol increase but did not alter renal renin mRNA, renal renin or prorenin protein content, nor plasma renin levels compared with sham operated. However, HPD fetuses had increased ANG II receptor subtype 1 (AT1) mRNA and protein expression in the kidney and lungs. ANG II receptor subtype 2 (AT2) expression was not altered in these tissues at either mRNA or protein level. HPD did not change AT1 or AT2 mRNA in the left ventricle but did result in decreased protein levels for both receptors. These studies demonstrate that blockade of the naturally occurring increase in fetal cortisol concentration in late gestation is associated with tissue-specific alterations in expression of AT1 and AT2 receptors. These changes may impact on fetal tissue maturation and hence have consequences in postnatal life.
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Affiliation(s)
- Kai Chen
- Dept. of Obstetrics and Gynecology, Wake Forest Univ. School of Medicine, Winston-Salem, NC 27157-1066, USA
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18
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Lai KN, Chan LYY, Tang SCW, Tsang AWL, Li FFK, Lam MF, Lui SL, Leung JCK. Mesangial expression of angiotensin II receptor in IgA nephropathy and its regulation by polymeric IgA1. Kidney Int 2004; 66:1403-16. [PMID: 15458433 DOI: 10.1111/j.1523-1755.2004.00874.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Enhanced gene expression for the renin-angiotensin system (RAS) is detected in glomerular mesangial cells in IgA nephropathy (IgAN). Preliminary studies showed a reduced glomerular gene expression of angiotensin II subtype 1 receptor (AT1R), suggesting a regulatory response to high intrarenal angiotensin II (Ang II) concentration in IgAN. METHODS We examined the effect of polymeric IgA1 (pIgA1) from patients with IgAN on the expression of Ang II receptors in cultured human mesangial cells (HMC). RESULTS Polymeric IgA1 from patients with IgAN down-regulated the expression of AT1R in HMC in a dose-dependent manner. When similar experiments were conducted with addition of an angiotensin-converting enzyme inhibitor (captopril) or an AT1R antagonist (losartan), there was a significant increase in the expression of AT1R. Blockade of Ang II with captopril or losartan alone resulted in a stepwise increase of AT1R in cultured HMC. Down-regulation of Ang II subtype 2 receptor (AT2R) was not observed in HMC cultured with pIgA1 from patients with IgAN. The acute suppressive effect of pIgA1 from IgAN on the expression of AT1R was confirmed in HMC incubated with IgA isolated from 15 IgAN patients, 15 healthy subjects, and other glomerulonephritides control subjects. Reduced glomerular expression of AT1R (but not AT2R) was also demonstrated in renal biopsies from patients with IgAN. CONCLUSION Our findings demonstrate an altered AT1R expression in HMC in response to raised intrarenal Ang II in IgAN. Our in vitro studies also support that an imbalance of AT1R and AT2R activity in HMC following exposure to pIgA plays a significant pathogenetic role in the inflammatory injury in IgAN.
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MESH Headings
- Apoptosis/physiology
- Biopsy
- Cells, Cultured
- Gene Expression
- Glomerular Mesangium/immunology
- Glomerular Mesangium/pathology
- Glomerular Mesangium/physiopathology
- Glomerulonephritis, IGA/immunology
- Glomerulonephritis, IGA/pathology
- Glomerulonephritis, IGA/physiopathology
- Humans
- Immunoglobulin A/metabolism
- Immunoglobulin A/pharmacology
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 1/metabolism
- Receptor, Angiotensin, Type 2/genetics
- Receptor, Angiotensin, Type 2/metabolism
- Renin-Angiotensin System/physiology
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Affiliation(s)
- Kar Neng Lai
- Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong.
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Mok KYK, Sandberg K, Sweeny JM, Zheng W, Lee S, Mulroney SE. Growth hormone regulation of glomerular AT1 angiotensin receptors in adult uninephrectomized male rats. Am J Physiol Renal Physiol 2003; 285:F1085-91. [PMID: 12824079 DOI: 10.1152/ajprenal.00383.2002] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Sex differences exist in the mechanisms initiating early compensatory renal growth after unilateral nephrectomy (UNX); remnant kidney growth is growth hormone (GH) independent in adult female rats and GH dependent in adult male rats. The present study determined whether sex differences also exist in angiotensin type 1 receptor (AT1R) regulation during early remnant kidney (REM) growth after UNX, and if so, whether GH modulates AT1R expression after UNX in the male rat. Scatchard analysis of radioligand binding in glomeruli demonstrated that 48 h post-UNX, AT1R density (Bmax) was significantly decreased by 20% in female REM compared with control kidneys. In contrast, male REM glomerular Bmax was significantly increased by 28% compared with control kidneys. Furthermore, GH-suppressed male rats displayed attenuated REM growth, which was associated with a 35% decrease in AT1R Bmax. Losartan treatment also decreased REM AT1R Bmax by 55%. The activity of mRNA binding proteins that bind to the 5' leader sequence of the AT1R was regulated by UNX and GH treatment in an inverse manner to AT1R expression. These findings suggest that in rats 1) there are sex differences in the regulation of glomerular AT1R expression after UNX; 2) the increase in AT1R binding sites in the male REM is regulated by GH and mediates early remnant kidney growth; and 3) AT1R 5' leader sequence mRNA binding proteins play a role in UNX and GH regulation of glomerular AT1Rs in both males and females.
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Affiliation(s)
- Ka-Yin K Mok
- Department of Physiology and Biophysics, Georgetown University School of Medicine, 3900 Reservoir Road NW, Washington, DC 20057, USA
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20
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Kurikawa N, Suga M, Kuroda S, Yamada K, Ishikawa H. An angiotensin II type 1 receptor antagonist, olmesartan medoxomil, improves experimental liver fibrosis by suppression of proliferation and collagen synthesis in activated hepatic stellate cells. Br J Pharmacol 2003; 139:1085-94. [PMID: 12871826 PMCID: PMC1573934 DOI: 10.1038/sj.bjp.0705339] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
1. We studied the effect of a new angiotensin II type 1 (AT(1)) receptor antagonist, olmesartan medoxomil (olmesartan), on the fibrogenic responses in rat hepatic stellate cells (HSCs) and liver fibrogenesis. 2. Olmesartan (1 mg kg(-1) per day) was orally administered to fibrotic rats, induced by bile duct ligation. Liver hydroxyproline content, the mRNA expression of collagen alpha1(I) and alpha-smooth muscle actin (alpha-SMA), and plasma levels of transforming growth factor-beta1 (TGF-beta1) were significantly reduced by olmesartan treatment, suggesting that olmesartan improved liver fibrosis. Interestingly, AT(1) receptors were found to be expressed in alpha-SMA-positive cells in the fibrotic area of livers in bile duct-ligated rats by immunohistochemical analysis. Olmesartan treatment reduced the number of these cells. 3. In vitro experiments showed that angiotensin II (Ang II) treatment induced proliferation and collagen synthesis, and upregulated the profibrogenic cytokines, TGF-beta1 and connective tissue growth factor (CTGF), in rat primary HSCs. Olmesartan blocked all these effects of Ang II. 4. Based on these results, since activated HSCs were found to express AT(1) receptors and Ang II is thought to play an important role in the pathogenesis of liver fibrosis by binding to these receptors, olmesartan may act as a potent antifibrotic drug to suppress the proliferation, collagen synthesis and the expression of profibrogenic cytokines in activated HSCs by blocking these receptors.
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Affiliation(s)
- Nobuya Kurikawa
- Pharmacology and Molecular Biology Research Laboratories, Sankyo Co., Ltd, 2-58, Hiromachi 1-chome, Shinagawa-ku, Tokyo 140-8710, Japan.
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Garg J, Bakris GL. Angiotensin converting enzyme inhibitors or angiotensin receptor blockers in nephropathy from type 2 diabetes. Curr Hypertens Rep 2002; 4:185-90. [PMID: 12003699 DOI: 10.1007/s11906-002-0005-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Type 2 diabetes is the most common cause of end-stage renal disease in the United States, and type 2 diabetes has been shown to be a myocardial infarction equivalent in regard to risk of death from a cardiovascular event. Proteinuria is a surrogate marker for renal disease progression, and although data favor both the angiotensin converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs) in reducing proteinuria, data for renal outcomes, such as time to dialysis, only exist for the ARBs, which clearly increase the duration to dialysis. Conversely, ACE inhibitors have overwhelming data that show substantial risk reduction from cardiovascular events and death in people with type 2 diabetes. Similar data on cardiovascular risk reduction are not yet available with ARBs, although two trials of renal disease progression did have cardiovascular endpoints as secondary outcomes. There were no significant differences between the ARB and control group except for first hospitalization with heart failure, where losartan reduced the risk by 32%, but there was a trend, albeit not significant, toward reduction of myocardial infarction. The first information regarding ARB effects on cardiovascular events as primary outcomes will come from the Losartan Intervention for Endpoint (LIFE) Reduction in Hypertension study. Therefore, as of this writing, all patients with type 2 diabetes and no evidence of nephropathy, ie, proteinuria and an elevated creatinine > 1.5 mg/dL, should be placed on an ACE inhibitor for cardiovascular risk reduction. If nephropathy is present, the evidence would support an ARB for therapy in concert with a b-blocker for cardiovascular risk reduction and renoprotection.
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Affiliation(s)
- Jay Garg
- Rush Medical Center, 1700 W. Van Buren Street, Suite 470, Chicago, IL 60612, USA.
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22
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Abstract
When angiotensin II or AT1 receptor is experimentally inhibited during the perinatal period, either by pharmacological intervention or genetic manipulation, the kidney develops with profound structural abnormalities. Most prominent are hypertrophy of arterial vasculatures and atrophy of the papilla. Although the mechanism by which the vascular hypertrophy occurs remains unknown, study of the atrophic papilla gives us a new clue for understanding the physiological role of angiotensin. Mutant mice completely devoid of AT1 receptor fail to develop the renal pelvis and the ureteral peristaltic movement. Normally, angiotensin and AT1 receptor are transiently up-regulated around the renal outlet at birth. Thus angiotensin II induces the peristaltic machinery during the perinatal period in a timely fashion to accommodate the dramatic increase in urine production that occurs during the transition from intra- to extra-uterine life. Further studies revealed that in adult animals angiotensin augments the peristaltic movement when the urinary tract is partially obstructed, thereby protecting the kidney from hydronephrosis. This newly discovered function of angiotensin to protect kidney architecture at the time of urine outflow obstruction is reminiscent of its similar kidney structure-protecting function that is active during arterial blood flow obstruction.
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Affiliation(s)
- Taiji Matsusaka
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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23
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Lessons to better understanding of hypoxia sensing. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2001. [DOI: 10.1007/978-1-4757-3401-0_13] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Abstract
The absolute polycythemias--those with increased red blood cell mass--can be divided into two groups: primary, caused by acquired or inherited mutations leading to a "gain-of-function" abnormalities expressed within the erythroid progenitors; and secondary, due to circulating serum factors, typically erythropoietin, stimulating erythropoiesis. This overview concentrates on the molecular biology of polycythemia vera (PV) discussed in the context of other polycythemic disorders. Recent advances in the regulation of erythropoiesis, as they may relate to polycythemic states, are discussed as a background for those well-defined polycythemic states wherein the molecular defect has not yet been elucidated. A number of cellular abnormalities associated with PV, including the hyperresponsiveness of PV progenitors to many cytokines as well as decreased expression of the thrombopoietin receptor on platelets and increased expression of Bcl-xL, suggest that the PV defect alters a number of cellular functions and is not restricted to cytokine receptor signal transduction. The increasing number of recognized instances of familial incidence of PV suggests that in these families the predisposition for PV is inherited as a dominant trait, and that PV is acquired as a new mutation that leads to a clonal hematopoiesis and may be due to loss of heterozygosity. The existence of these families provides a unique opportunity for isolation of the mutations in the gene leading to PV. Semin Hemaol 38(suppl 2):10-20.
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Affiliation(s)
- J T Prchal
- Division of Hematology/Oncology, Baylor College of Medicine, 1 Baylor Plaza MS 525 D, Houston, TX 77030, USA
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25
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Nilsson AB, Nitescu N, Chen Y, Guron GS, Marcussen N, Matejka GL, Friberg P. IGF-I treatment attenuates renal abnormalities induced by neonatal ACE inhibition. Am J Physiol Regul Integr Comp Physiol 2000; 279:R1050-60. [PMID: 10956265 DOI: 10.1152/ajpregu.2000.279.3.r1050] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An intact renin-angiotensin system (RAS) during nephrogenesis is essential for normal renal development. We have shown previously that neonatal inhibition of the RAS, either with ANG II type 1-receptor blockade or angiotensin-converting enzyme (ACE) inhibition, induces irreversible renal abnormalities. The aim of the present study was to investigate whether an interrupted RAS can be compensated for by exogenous administration of another important renal growth-promoting factor, the insulin-like growth factor-I (IGF-I). Rats were treated daily with either the ACE inhibitor enalapril (10 mg/kg), recombinant human IGF-I (3 mg/kg), or the combination enalapril + IGF-I from perinatal day 3 to 13. Urinary concentrating ability, renal function, and renal morphology were assessed at adult age. The gene expression and localization of IGF-I, its receptor, and the growth hormone receptor (GHR) were investigated during ongoing ACE inhibition. The present study demonstrates normalized renal function and histology in enalapril + IGF-I-treated animals. Ongoing ACE inhibition suppressed the medullary IGF-I mRNA expression and altered the local distribution of both IGF-I and GHR. Thus the present study provides evidence for an interaction between the RAS and GH/IGF-I axis in renal development.
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Affiliation(s)
- A B Nilsson
- Department of Physiology, Institute of Physiology and Pharmacology, Göteborg University, Medicinaregatan 11, S-413 90 Göteborg.
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26
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Bataller R, Ginès P, Nicolás JM, Görbig MN, Garcia-Ramallo E, Gasull X, Bosch J, Arroyo V, Rodés J. Angiotensin II induces contraction and proliferation of human hepatic stellate cells. Gastroenterology 2000; 118:1149-56. [PMID: 10833490 DOI: 10.1016/s0016-5085(00)70368-4] [Citation(s) in RCA: 342] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND & AIMS Circulating levels of angiotensin II (ANGII), a powerful vasoconstrictor factor, are frequently increased in chronic liver diseases. In these conditions, hepatic stellate cells (HSCs) proliferate and acquire contractile properties. This study investigated the presence of receptors for ANGII and the effects of ANGII in human HSCs activated in culture. METHODS The presence of ANGII receptors was assessed by binding studies. The effects of ANGII on intracellular calcium concentration ([Ca(2+)](i)), cell contraction, and cell proliferation were also assessed. RESULTS Binding studies showed the presence of ANGII receptors of the AT1 subtype. ANGII elicited a marked dose-dependent increase in [Ca(2+)](i) and cell contraction. Moreover, ANGII stimulated DNA synthesis and increased cell number. All these effects were totally blocked by losartan and reduced by nitric oxide donors or prostaglandin E(2). The effects of ANGII were barely detectable in quiescent cells (2 days in culture), suggesting that phenotypic transformation of HSCs is associated with a marked increase in the effects of ANGII. CONCLUSIONS ANGII induces contraction and is mitogenic for human-activated HSCs by acting through AT1 receptors. These results suggest that activated HSCs are targets of the vasoconstrictor action of ANGII in the intrahepatic circulation.
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27
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Izevbigie EB, Gutkind JS, Ray PE. Angiotensin II and basic fibroblast growth factor mitogenic pathways in human fetal mesangial cells. Pediatr Res 2000; 47:614-21. [PMID: 10813586 DOI: 10.1203/00006450-200005000-00010] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Angiotensin II (Ang II) and basic fibroblast growth factor (bFGF/FGF-2) play relevant roles in renal development. Since the signaling pathways modulating the mitogenic effects of Ang II and bFGF in human fetal mesangial cells (HFMc) are not clearly defined, we carried out experiments to determine whether they would exert their mitogenic effects by modulating the activity of the mitogen-activated protein kinases (MAPK) [extracellular signal-regulated kinase-2 (ERK-2)] and cAMP signaling pathways. In confluent HFMc, bFGF (20 ng/mL) induced a significant 4-fold increase in ERK-2 activity and [3H]-thymidine incorporation (6-fold). In contrast, under similar tissue culture conditions, Ang II (10(-6) M) induced a more modest increase in ERK-2 activity (2-fold) and [3H]-thymidine incorporation (35 +/- 4%). The mitogen-activated protein kinase kinase-1 (MEK-1) inhibitor PD098059 (25 microM) almost completely abolished the bFGF-induced proliferation in HFMc but did not significantly affect Ang II proliferative effects. In the presence of the cAMP elevating agent isoproterenol, Ang II and bFGF induced opposite changes in cAMP accumulation and cell growth. Isoproterenol inhibited the basal and bFGF-induced proliferation of HFMc through a MEK-1/2-independent pathway that included the accumulation of cAMP. In contrast, isoproterenol increased Ang II mitogenic effects in correlation with a reduction in cAMP accumulation. We conclude that Ang II and bFGF modulate the proliferation of HFMc through the stimulation of different MEK-1/2-dependent and independent signaling pathways. Activation of MEK-1/2 is required but not sufficient for mitogenesis in HFMc. The accumulation of cAMP in HFMc counteracts the mitogenic effects of bFGF by a MEK-1/2-independent pathway.
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Affiliation(s)
- E B Izevbigie
- Center for Molecular Physiology Research, Children's Research Institute, Children's National Medical Center, Washington, DC, 20010, USA
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28
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Abstract
All components of the renin-angiotensin system (RAS) are highly expressed in the developing kidney in a pattern that suggests a role for angiotensin II in renal development In support of this notion, pharmacological interruption of angiotensin II type-1 (AT1) receptor-mediated effects in animals with an ongoing nephrogenesis produces specific renal abnormalities characterized by papillary atrophy, abnormal wall thickening of intrarenal arterioles, tubular atrophy associated with expansion of the interstitium, and a marked impairment in urinary concentrating ability. Similar changes in renal morphology and function also develop in mice with targeted inactivation of the genes that encode angiotensinogen, angiotensin converting enzyme, or both AT1 receptor isoforms simultaneously. Taken together, these results clearly indicate that an intact signalling through AT1 receptors is a prerequisite for normal renal development In a recent study, an increased incidence of congenital anomalies of the kidney and urinary tract was detected in mice deficient in the angiotensin II type-2 receptor, suggesting that this receptor subtype is also involved in the development of the genitourinary tract The present report mainly reviews the renal abnormalities that have been induced by blocking the RAS pharmacologically or by gene targeting in experimental animal models. In addition, pathogenetic mechanisms and clinical implications are discussed.
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Affiliation(s)
- G Guron
- Department of Physiology, Institute of Physiology and Pharmacology, Göteborg University, Sweden.
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29
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Miller JA. Impact of hyperglycemia on the renin angiotensin system in early human type 1 diabetes mellitus. J Am Soc Nephrol 1999; 10:1778-85. [PMID: 10446946 DOI: 10.1681/asn.v1081778] [Citation(s) in RCA: 125] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
It has been demonstrated previously that moderate hyperglycemia without glucosuria can increase plasma renin activity and mean arterial pressure in young healthy males with early uncomplicated type 1 diabetes mellitus. This study was conducted to extend these observations by testing the hypothesis that mild to moderate hyperglycemia can affect renal function by increasing renin angiotensin system (RAS) activity in diabetic humans. The study included 10 men and women with early, uncomplicated type 1 diabetes (duration <5 yr), all ingesting a controlled sodium and protein diet. They were studied on four separate occasions, during a subdepressor dose of the angiotensin II (AngII) receptor blocker losartan, and during graded AngII infusion, 1.5 and 2.5 ng/kg per min, while euglycemic (blood glucose 4 to 6 mmol/L) and again while hyperglycemic without glucosuria (blood glucose 9 to 11 mmol/L), according to a randomized crossover design. Outcome measures included mean arterial pressure (MAP), GFR, effective renal plasma flow (ERPF), renal vascular resistance (RVR), filtration fraction (FF), and urine sodium excretion (UNaV) at baseline and in response to the above maneuvers. During hyperglycemic conditions, MAP was significantly higher compared with euglycemia, as were RVR and FF. After the administration of losartan, a significant renal and peripheral depressor effect was noted, with decreases in MAP, RVR, and FF, whereas during euglycemia the responses to losartan were minimal. AngII infusion resulted in elevations in MAP, RVR, and FF and a decline in UNaV during both glycemic phases, but the responses during hyperglycemia, most significantly at the 1.5 ng/kg per min infusion rate, were blunted. These data support the hypothesis that hyperglycemia affects renal function by activating the RAS. The mechanism remains obscure, but these contrasting responses may provide a link between the observations that maintenance of euglycemia and blockade of the RAS prevent or delay diabetic kidney disease, and furthermore, may clarify the mechanism whereby high glucose promotes renal disease progression in diabetes.
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Affiliation(s)
- J A Miller
- Department of Medicine, University of Toronto, Ontario, Canada.
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30
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Nagamatsu T, Hayashi K, Oka T, Suzuki Y. Angiotensin II type I receptor antagonist suppresses proteinuria and glomerular lesions in experimental nephritis. Eur J Pharmacol 1999; 374:93-101. [PMID: 10422645 DOI: 10.1016/s0014-2999(99)00276-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Angiotensin-converting enzyme inhibitors exert a beneficial effect on nephritis. We investigated the effects of KD3-671, an angiotensin AT1 receptor antagonist (2-propyl-8-oxo-1-[(2'-(H-tetrazole-5-yl)biphenyl-4-yl)methyl]-4,5,6,7-t etrahydro-cycloheptimidazole), on anti-glomerular basement membrane antibody-associated nephritis in rats. Untreated nephritic rats had massive proteinuria, glomerular lesions including crescent formation, a significant augmentation of proliferating cell nuclear antigen-positive cells, alpha-smooth muscle actin-positive cells, and the increase in deposition of proteoglycan, fibronectin and desmin in the glomeruli. Administration of KD3-671 to nephritic rats prevented the development of intense proteinuria, glomerular alterations and the increase in plasma urea nitrogen. KD3-671 suppressed the deposition of matrix protein and the expression of alpha-smooth muscle actin and desmin in the nephritic glomeruli. Captopril, an angiotensin-converting enzyme inhibitor, suppressed urinary protein excretion and the expression of desmin in the nephritic glomeruli, but not other parameters. These results suggest that KD3-671 may be a useful medicine against glomerulonephritis and glomerulosclerosis.
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Affiliation(s)
- T Nagamatsu
- Department of Pharmacology, Faculty of Pharmacy, Meijo University, Nagoya, Japan
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31
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Abstract
This overview concentrates on familial and congenital polycythemias in the context of other polycythemic disorders, with emphasis on those with established molecular lesions. Recent advances in the regulation of erythropoiesis, as they may relate to polycythemic states, are discussed as a background for those well-defined polycythemic states wherein the molecular defect has not yet been elucidated. Primary familial congenital polycythemias and congenital and familial secondary polycythemias, including hemoglobin mutants, methemoglobinemias and congenital 2,3-bisphosphoglycerate deficiency, are discussed. The most common primary polycythemia, polycythemia vera, as well as the only likely endemic congenital secondary polycythemia, known as Chuvash polycythemia, are discussed.
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Affiliation(s)
- J F Prchal
- Division of Hematology/Oncology, University of Alabama at Birmingham, 35294, USA
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32
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Abstract
BACKGROUND It is clear that women with renal disease progress to end stage at a slower rate than do men. We hypothesized that this protection may result from gender-mediated differences in responses to angiotensin II (Ang II), which has known hemodynamic effects that are thought to promote renal disease progression. We examined sex differences in renin-angiotensin system (RAS) function by measuring renal hemodynamic function and circulating plasma components of the RAS at baseline and in response to graded infusions of Ang II. METHODS We studied two groups of normal healthy subjects, 24 men and 24 women, mean age 28 +/- 1 years, ingesting a controlled sodium and protein diet. We examined baseline concentrations of angiotensin converting enzyme, plasma renin activity, Ang II, and aldosterone. Inulin and paraaminohippurate clearance techniques were used to estimate effective renal plasma flow (ERPF) and glomerular filtration rate (GFR) at baseline and in response to graded Ang II infusion (0.5, 1.5, and 2.5 ng/kg/min). RESULTS Mean baseline values for mean arterial pressure and aldosterone were lower in women, whereas values for plasma Ang II, GFR, ERPF, and filtration fraction (FF) did not differ. In response to Ang II, both groups exhibited a similar increase in mean arterial pressure and a decline in ERPF. GFR was maintained during Ang II infusion only in men, resulting in an augmentation of FF. In women, GFR declined in parallel with ERPF, and the FF response was significantly blunted. 17beta-Estradiol plasma concentrations influenced the ERPF response to Ang II infusion, with higher levels predicting a blunting of the decrease. The GFR response was not affected. CONCLUSIONS The renal microcirculation in sodium-replete women may respond differently to Ang II than that of men, with the female sex predicting a lesser augmentation of FF and possibly a blunted increase in intraglomerular pressure. The mechanism remains obscure, but these contrasting responses may help to explain gender-mediated differences in renal disease progression.
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Affiliation(s)
- J A Miller
- Department of Medicine, University of Toronto, Toronto, Canada.
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33
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Peters H, Border WA, Noble NA. Targeting TGF-beta overexpression in renal disease: maximizing the antifibrotic action of angiotensin II blockade. Kidney Int 1998; 54:1570-80. [PMID: 9844133 DOI: 10.1046/j.1523-1755.1998.00164.x] [Citation(s) in RCA: 176] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Overproduction of transforming growth factor-beta (TGF-beta) is a key mediator of extracellular matrix accumulation in fibrotic diseases. We hypothesized that the degree of reduction of pathological TGF-beta expression can be used as a novel index of the antifibrotic potential of angiotensin II (Ang II) blockade in renal disease. METHODS One day after induction of Thy 1.1 glomerulonephritis, rats were treated with increasing doses of the Ang I converting enzyme (ACE) inhibitor enalapril and/or the Ang II receptor blocker losartan in the drinking water. Six days after disease induction the therapeutic effect on glomerular TGF-beta overexpression was evaluated. RESULTS Both enalapril and losartan reduced TGF-beta overproduction in a dose-dependent manner, showing a moderate reduction at doses known to control blood pressure in renal forms of hypertension. A maximal reduction in TGF-beta expression of approximately 45% was seen for both drugs starting at 100 mg/liter enalapril and 500 mg/liter losartan, with no further reduction at doses of enalapril up to 1000 mg/liter or losartan up to 2500 mg/liter. Co-treatment with both drugs was not superior to single therapy. Consistent with our hypothesis that reduction in TGF-beta expression is a valid target, other disease measures, including glomerular matrix accumulation, glomerular production and mRNA expression of the matrix protein fibronectin and the protease inhibitor plasminogen-activator-inhibitor type 1 (PAI-1) closely followed TGF-beta expression. CONCLUSIONS The data suggest that these therapies act through very similar pathways and that, in order to more effectively treat renal fibrosis, these drugs must be combined with other drugs that act by different mechanisms.
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Affiliation(s)
- H Peters
- Division of Nephrology, University of Utah School of Medicine, Salt Lake City, Utah, USA
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34
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Abstract
Other than its known effects on the cardiovascular system, angiotensin II (Ang II) stimulates cell growth in several cell types. In this study, we examined whether it also might affect bone cell metabolism. Ang II stimulated DNA and collagen synthesis and decreased alkaline phosphatase (AP) activity in bone cell populations derived from the periosteum of fetal rat calvariae. Similar effects of Ang II were observed on human adult bone cells obtained by collagenase digestion from trabecular bone. Clonal cell analysis, autoradiographic studies, and receptor subtype analysis suggested the presence of specific Ang II receptor subtype 1 (AT1) binding sites on AP+ osteoblastic precursor cells. Ang II had no direct effects on osteoblastic cells with a mature phenotype, but paracrine effects of Ang II on mature osteoblasts could be observed upon coculture with Ang II-responsive bone cell populations. Because Ang II is known to be locally generated by endothelial cells, Ang II might play an important role in coordinating capillary cell growth and osteoblastic bone formation during bone remodeling.
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Affiliation(s)
- S Lamparter
- Department of Internal Medicine I, University of Heidelberg, Germany.
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35
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Franco M, Paniagua R, Herrera-Acosta J. Renal effects of renin-angiotensin system blockade. Curr Opin Nephrol Hypertens 1998; 7:153-8. [PMID: 9529617 DOI: 10.1097/00041552-199803000-00003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Pharmacological interruption of the renin-angiotensin system at different pathway levels has extended our knowledge on the distribution of angiotensin receptors in different nephron segments, its regulation and tubular cell responses. Novel beneficial effects obtained with blockade of this peptide on cellular proliferation and its interaction with other vasoactive systems are particularly important for preventing renal damage.
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Affiliation(s)
- M Franco
- Department of Nephrology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
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36
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Kim Y, Imdad RY, Stephenson AH, Sprague RS, Lonigro AJ. Vascular endothelial growth factor mRNA in pericytes is upregulated by phorbol myristate acetate. Hypertension 1998; 31:511-5. [PMID: 9453354 DOI: 10.1161/01.hyp.31.1.511] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Increased microvascular permeability, which occurs in conditions such as the adult respiratory distress syndrome and diabetes mellitus, is related to physicochemical alterations in the microvascular barrier. We postulate that, in part, capillary pericytes affect microvascular permeability via production of a vasoactive cytokine, viz, vascular endothelial growth factor (VEGF), also known as vascular permeability factor. The goal of the present study was to evaluate the effects of phorbol myristate acetate (PMA), a substance known to produce nonhydrostatic pulmonary edema in intact animals, on VEGF gene expression in pericyte cultures. Microvascular pericytes were isolated from bovine retinas using magnetic microspheres coated with 3G5 monoclonal antibody. Pericyte identity was confirmed both morphologically and by immunostaining for alpha-smooth muscle actin and 3G5 ganglioside. The cultured pericytes were stimulated with N(omega)-nitro-L-arginine methyl ester (L-NAME, 1 x 10(-4) mmol/L), angiotensin II (1 x 10(-6) mmol/L), and PMA (5 x 10(-8) mmol/L), selected because of their ability to upregulate VEGF mRNA expressions in other cell types. Northern blot analysis was performed using [32P]dCTP labeled human VEGF cDNA (Genentech). Lane-loading differences were normalized using mouse GAPDH control cDNA probe. VEGF mRNA expression was upregulated by PMA (10(-9) to 10(-6) mol/L) in a dose-dependent manner, whereas neither L-NAME nor angiotensin II affected VEGF mRNA expression in pericytes. These results support the hypothesis that pericytes increase permeability of the endothelial barrier through increased VEGF production.
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Affiliation(s)
- Y Kim
- Department of Internal Medicine, Saint Louis University School of Medicine, Mo 63104, USA
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37
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Abstract
The renin-angiotensin system (RAS) plays a key role in cardiovascular homeostasis through the interactions of angiotensin II with its receptors. All components of the RAS are developmentally regulated in the kidney. The functions of the system in the maturing kidney overlap those of the adult, but higher levels of expression and novel locations of expression in the fetus suggest that the RAS has alternate functions as well. Increasing evidence suggests that the RAS may regulate renal growth and development by initiating a complex cascade of events, involving growth factors and proto-oncogenes and other unidentified factors. These same cascades may also be important in renal disease states. Recent advances in the field of molecular and cell biology are providing new tools and strategies to elucidate the intimate mechanism whereby the RAS regulates growth processes and disease states.
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Affiliation(s)
- J M Harris
- University of Virginia Health Sciences Center, Charlottesville 22908, USA
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38
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Wolf G, Assmann KJ, Stahl RA. Overexpression of aminopeptidase A abolishes the growth promoting effects of angiotensin II in cultured mouse mesangial cells. Kidney Int 1997; 52:1250-60. [PMID: 9350648 DOI: 10.1038/ki.1997.450] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Angiotensin II (Ang II) has diverse effects on the glomerular tuft such as regulation of glomerular hemodynamics and stimulation of mesangial cell growth, and may be one pivotal factor in the progression of renal disease. In order to locally inactivate Ang II, we overexpressed aminopeptidase A (E.C. 3.4.11.7; ATA), a peptidase involved in the conversion of Ang II into angiotensin III, in a mouse mesangial cell line (MMC) that normally does not exhibit this enzyme. Stable transfections were selected in medium containing G418. ATA-overexpressing clones ATA5 and ATA21 revealed mRNA, protein, and enzyme activity in contrast to wild-type MMCs or mock-transfected Neo3 cells (stably transfected with expression vectors without ATA cDNA). There was no difference in the binding of Ang II to its putative receptors in all cell lines. Ang II increased intracellular inositol 1,4,5-triphosphate (IP3) in Neo3, but not in ATA5 and ATA21 cells. In contrast to MMCs and Neo3 cells, Ang II failed to stimulate proliferation in ATA5 and ATA21 clones as measured by [3H] thymidine incorporation and direct cell counts. However, ATA5 and ATA21 revealed a mitogenic response not different from MMCs after stimulation 2% or 10% of fetal calf serum. Treatment of ATA5 and ATA21 with 0.1 mM of the ATA-inhibitor amastatin or an ATA-inhibiting specific monoclonal antibody restored the proliferative effect of Ang II, suggesting that surface activity of ATA is involved in the attenuated mitogenesis in these cell. Our study demonstrates that it is feasible to overexpress Ang II-degrading enzymes in cultured mesangial cells and that this overexpression attenuated some effect of exogenous Ang II. These experiments are a first step toward the development of novel strategies to selectively antagonize locally generated Ang II in the kidney.
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Affiliation(s)
- G Wolf
- Department of Medicine, University of Hamburg, Germany.
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39
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Gaits F, Salles JP, Chap H. Dual effect of lysophosphatidic acid on proliferation of glomerular mesangial cells. Kidney Int 1997; 51:1022-7. [PMID: 9083266 DOI: 10.1038/ki.1997.143] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Among the variety of factors able to contribute to mesangial hypertrophy by altering mesangial cell growth, lysophosphatidic acid (LPA) is the focus of increasing attention. It is produced in plasma following platelet activation, as well as by mesangial cells stimulated by secretory phospholipase A2. As mitogenic/antimitogenic properties of LPA are already described in a variety of cells, knowledge of its specific actions on mesangial cells is of potential interest regarding the pathophysiology of glomerulus damage in situ. We tested the effect of LPA on cultured rat mesangial cell growth. At 10 to 20 microM, LPA stimulated thymidine incorporation as well as phosphorylation of mitogen-activated protein kinases (MAP-kinases) p42-p44 in dose- and time-dependent manner, which demonstrated a positive effect on cell proliferation. However, higher concentrations of LPA (100 microM) were unable to stimulate thymidine incorporation and partly inhibited the proliferative effect as well as p42-p44 phosphorylation evoked by serum. Finally, whereas lysophosphatidylcholine (10 to 20 microM) was lytic for mesangial cells, no cell lysis could be detected at the highest concentrations of LPA. Taken together, these results suggest that LPA exerts a dual effect on mesangial cell proliferation, which could be due to activation of distinct specific signaling pathways, in dose-dependent fashion. Specific actions of LPA able to modify mesangial cell proliferation in a positive or negative manner are also likely to influence the pathophysiological processes involved in the progression of glomerulosclerosis in the kidney.
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Affiliation(s)
- F Gaits
- Institut Fédératif de Recherche en Immunologie Cellulaire et Moléculaire, Université Paul Sabatier, Toulouse, France
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40
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Jimi N, Segawa K, Minami K, Sata T, Shigematsu A. Inhibitory Effect of the Intravenous Anesthetic, Ketamine, on Rat Mesangial Cell Proliferation. Anesth Analg 1997. [DOI: 10.1213/00000539-199701000-00034] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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41
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Jimi N, Segawa K, Minami K, Sata T, Shigematsu A. Inhibitory effect of the intravenous anesthetic, ketamine, on rat mesangial cell proliferation. Anesth Analg 1997; 84:190-5. [PMID: 8989023 DOI: 10.1097/00000539-199701000-00034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We studied the effects of ketamine and propofol on rat cultured mesangial cell (MC) proliferation. The 72-h exposure to ketamine (1-100 microM) inhibited [3H]thymidine incorporation into the MC in a concentration-dependent manner. Propofol, however, was not effective at inhibition of MC proliferation at doses from 1 to 100 microM. Ketamine also decreased the cell number at clinically relevant concentrations and increased adenosine 3',5'-cyclic monophosphate (cAMP) levels in MC. We also studied the effects of ketamine on cytokine-induced [3H]thymidine incorporation into the cells. Ketamine decreased the tumor necrosis factor-alpha (TNF-alpha)-, interleukin 1 (IL-1)-, and interleukin 6 (IL-6)-induced [3H]thymidine incorporation into the cells. It also decreased angiotensin II (Ag II)-induced [3H]thymidine incorporation. These results suggest that ketamine has inhibitory effects on MC proliferation, but that propofol does not. Because ketamine inhibits TNF-alpha-, IL-1-, and IL-6-induced MC proliferation, it may be useful in suppressing the cell growth clinically.
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Affiliation(s)
- N Jimi
- Department of Anesthesiology, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan
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42
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el-Dahr SS, Dipp S, Yosipiv IV, Baricos WH. Bradykinin stimulates c-fos expression, AP-1-DNA binding activity and proliferation of rat glomerular mesangial cells. Kidney Int 1996; 50:1850-5. [PMID: 8943466 DOI: 10.1038/ki.1996.505] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
An important role for bradykinin (BK) in nephrogenesis has been suggested based on impairment of renal growth in developing rats treated with a kinin antagonist. However, direct effects of BK on renal cell mitogenesis have not been reported. In the present study, we examined the mitogenic effects of BK on cultured rat mesangial cells. Transcripts encoding BK-B2 receptors were detected in quiescent and proliferating mesangial cells by reverse transcription-coupled polymerase chain reaction. In quiescent mesangial cell cultures (0.5% FCS for 48 hr), BK (10(-9) to 10 (-7)M) caused a significant increase in DNA synthesis (3H-thymidine incorporation into DNA) and cell number. BK-induced DNA synthesis was preceded by activation of c-fos gene expression and both of these effects were inhibited by Hoe-140, a specific BK-B2 antagonist. Electrophoretic gel mobility shift assays revealed enhanced binding of AP-1 complexes to a consensus AP-1 DNA sequence in BK-stimulated cells. Gel supershift assays confirmed that the AP-1 complexes contained the fos protein. These data document a direct mitogenic effect of BK, acting on B2 receptors, on mesangial cells.
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Affiliation(s)
- S S el-Dahr
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, Louisiana, USA.
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43
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Oishi T, Ogura T, Yamauchi T, Harada K, Ota Z. Effect of renin-angiotensin inhibition on glomerular injuries in DOCA-salt hypertensive rats. REGULATORY PEPTIDES 1996; 62:89-95. [PMID: 8795070 DOI: 10.1016/0167-0115(95)00166-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
To determine whether growth factors in the glomerulus are induced in the renin suppressed hypertensive model, we examined the mRNA expressions of platelet-derived growth factor (PDGF) B-chain, transforming growth factor (TGF)-beta 1 and angiotensin II type 1 (AT1) receptors in the glomeruli of deoxycorticosterone acetate (DOCA)-salt-treated hypertensive rats (DOCA-treated rats). We also examined the effects of treatment with cilazapril, an angiotensin I-converting enzyme inhibitor (ACEI), and L-158,809, an AT1 receptor antagonist, on these expressions in DOCA-treated rats. We administered oral 10 mg/kg of cilazapril (CILAZA group) and 1 mg/kg of L-158,809 (L158 group) to DOCA-treated rats daily. Systolic blood pressure in the two groups was not decreased compared with that in DOCA-treated rats given saline. The mRNA expressions were examined using reverse transcriptase polymerase chain reaction (RT-PCR) methods. The mRNA expressions of these genes were higher in DOCA-treated rats than in age-matched control rats. After treatment with these agents for 4 weeks, the mRNA expressions of growth factors were suppressed in both the CILAZA and L158 groups. Mesangial expansion and cell proliferation observed in DOCA-treated rats were suppressed in both the CILAZA and L158 groups. Decreases in the size of the glomerulus were observed only in the CILAZA group. These findings suggested that suppression of growth factors and glomerular proliferative changes of these agents are mediated by blocking tissue renin-angiotensin system (RAS) in the renin-suppressed model.
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Affiliation(s)
- T Oishi
- Third Department of Internal Medicine, Okayama University Medical School, Japan
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44
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Troyanovskaya M, Song L, Jayaraman G, Healy DP. Expression of aminopeptidase A, an angiotensinase, in glomerular mesangial cells. Hypertension 1996; 27:518-22. [PMID: 8613196 DOI: 10.1161/01.hyp.27.3.518] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Glomerular mesangial cells are known to express angiotensin II type 1 receptors and contract in response to circulating and/or locally produced angiotensin II. In addition, stimulation of mesangial cell matrix protein synthesis by elevated levels of angiotensin II is known to contribute to the development of glomerulosclerosis. Previously, we reported that mesangial cells were positively immunostained with antiserum directed against aminopeptidase A, the principal angiotensinase in the metabolism of angiotensin II. Here we demonstrate directly that aminopeptidase A is expressed in mesangial cells cultured from rat kidney. First, cultured mesangial cells had measurable aminopeptidase A enzymatic activity. Second, immunoblots for aminopeptidase A were positive for isolated glomeruli and mesangial cells, although two bands were seen for mesangial cells (approximately 138 and 144 kD), and only the larger band was seen for isolated glomeruli and kidney. Third, Northern blot hybridizations of total RNA from mesangial cells or kidney were positive and labeled similarly sized bands. Fourth, reverse transcription-polymerase chain reaction amplification of mesangial cell total RNA yielded a partial cDNA of the expected size that was confirmed by sequencing to be identical to rat kidney aminopeptidase A. These results indicate that aminopeptidase A is expressed within mesangial cells. These results further suggest that metabolism of angiotensin II by aminopeptidase A could play a protective role in minimizing the adverse effects of angiotensin II stimulation of mesangial cells.
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Affiliation(s)
- M Troyanovskaya
- Department of Pharmacology, Mount Sinai School of Medicine, New York, NY 10029, USA
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45
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Yosipiv IV, el-Dahr SS. Activation of angiotensin-generating systems in the developing rat kidney. Hypertension 1996; 27:281-6. [PMID: 8567053 DOI: 10.1161/01.hyp.27.2.281] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The present study was designed to determine the developmental changes in intrarenal angiotensin (Ang) peptides in the rat. Kidney Ang I and II levels were threefold and sixfold higher in newborn than adult kidneys, respectively (Ang I, 678 +/- 180 versus 243 +/- 38 fmol/g, P < .01; Ang II, 667 +/- 75 versus 103 +/- 6 fmol/g, P < .001). Intrarenal Ang II levels correlated positively with the temporal changes in renin gene expression (r = .93, P < .001). However, no correlation was found between renal Ang II content and angiotensin-converting enzyme (ACE) expression during development, which prompted us to evaluate whether renal enzymes, other than renin and ACE, contribute to Ang II formation in the developing kidney. Angiotensin peptide levels were measured in newborn and adult kidney homogenates incubated with human angiotensinogen (a poor rat renin substrate) for 30 minutes at 37 degrees C. Inhibitors of aspartyl proteases and metalloproteases were ineffective in preventing the formation of Ang II in either newborn or adult kidneys. However, addition of the serine protease inhibitors soybean trypsin inhibitor and phenylmethylsulfonyl fluoride inhibited Ang II generation in the newborn kidneys only. In contrast, Ang I generation was not affected by inhibition of serine proteases in either newborn or adult kidneys. We conclude that Ang I and II synthesis is activated in the developing rat kidney. In addition to renin and ACE, the newborn rat kidney expresses serine protease activity that is capable of generating Ang II directly from angiotensinogen. This putative enzyme is induced in the newborn kidney and may cooperate with renin in the activation of Ang II synthesis during early development.
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Affiliation(s)
- I V Yosipiv
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, LA 70112, USA
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46
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Ramirez M, Davidson EA, Luttenauer L, Elena PP, Cumin F, Mathis GA, De Gasparo M. The renin-angiotensin system in the rabbit eye. J Ocul Pharmacol Ther 1996; 12:299-312. [PMID: 8875336 DOI: 10.1089/jop.1996.12.299] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
We analyzed the components of the renin-angiotensin system (RAS) in ocular tissues of normal rabbit eyes and compared the results with those measured in rabbit eyes with proliferative vitreoretinopathy and ocular hypertension. Proliferative vitreoretinopathy was induced by injection of human platelets into the vitreous humor, and ocular hypertension was induced by injection of alpha-chymotrypsin into the posterior chamber. Angiotensinogen, renin, angiotensin converting enzyme (ACE), angiotensin II (Ang II), and Ang II receptors were assessed using conventional biochemical techniques. The vascularized tissues of normal eyes contained high renin and ACE activities concomitant with low concentration of angiotensinogen and Ang II. In general, in the ocular humors, the opposite was found. The Ang II receptor density was highest in the uveal tract [range 35-190 fmol/mg protein]. The AT1 receptor subtype predominated [> 80%]. The RAS was only minimally different in the two pathological models except that, in ocular hypertension, the renin activity in the uveal tract was reduced [-50%]. Also, the ratio of AT1 to AT2 receptors changed as compared to control, although the total receptor density remained unaltered. In conclusion, we present evidence for the presence of a complete local RAS in the rabbit eye, which is only marginally affected by the two pathological models studied.
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Affiliation(s)
- M Ramirez
- Research Department, Ciba-Geigy Limited, Basel, Switzerland
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47
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Bensoussan M, Heudes D, Nahmias C, Delauche M, Lelongt B, Ronco PM. Organ culture of rat kidney: a model for angiotensin II receptor ontogenic studies. Kidney Int 1995; 48:1635-40. [PMID: 8544425 DOI: 10.1038/ki.1995.458] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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48
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Abstract
Molecular, cellular, and physiological studies indicate that the renin-angiotensin system (RAS) is highly expressed during early kidney development. We propose that a major function of the RAS during early embryonic development is the modulation of growth processes that lead the primitive kidney into a properly differentiated and architecturally organized organ suited for independent extrauterine life. As development progresses, the RAS acquires new and overlapping functions such as the endocrine and paracrine regulation of blood pressure and renal hemodynamics. Disease states in adult mammals often result in expression of RAS genes and phenotypic changes resembling the embryonic pattern, emphasizing the importance of undertaking developmental studies. Because of their importance in health and disease, the immediate challenge is to identify the mechanisms that regulate the unique development of the RAS and its role(s) in normal and abnormal growth processes.
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Affiliation(s)
- R A Gomez
- Department of Pediatrics, University of Virginia Health Sciences Center, Charlottesville 22908, USA
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49
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Ikeda M, Kohno M, Takeda T. Endothelin Production in Cultured Mesangial Cells of Spontaneously Hypertensive Rats. Hypertension 1995. [DOI: 10.1161/01.hyp.25.4.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Cultured glomerular mesangial cells have been shown to produce a potent vasoconstrictive peptide, endothelin-1 (ET-1). We examined whether basal or stimulated ET-1 production by angiotensin II (Ang II) or arginine vasopressin (AVP) is enhanced in cultured mesangial cells of spontaneously hypertensive rats (SHR) compared with Wistar-Kyoto rats (WKY). Basal ET-1 production in SHR mesangial cells was not different from that in WKY cells although a trend toward increased ET-1 production was observed in SHR cells. Ang II and AVP stimulated ET-1 production in a concentration-dependent manner in cells of both rat strains, but the agonist-induced stimulation was clearly greater in SHR cells than WKY cells. The protein kinase C–activating phorbol ester phorbol myristate acetate stimulated ET-1 production in a concentration-dependent manner in cells of both rat strains, but this stimulation was significantly greater in SHR cells than in WKY cells. These results suggest that Ang II– and AVP-induced mesangial cell production of ET-1 is clearly enhanced in SHR compared with WKY. Increased response of ET-1 production to protein kinase C activation appears to contribute in part to the observed enhancement of ET-1 production in SHR mesangial cells.
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Affiliation(s)
- Miwako Ikeda
- From the First Department of Internal Medicine, Osaka City (Japan) University Medical School
| | - Masakazu Kohno
- From the First Department of Internal Medicine, Osaka City (Japan) University Medical School
| | - Tadanao Takeda
- From the First Department of Internal Medicine, Osaka City (Japan) University Medical School
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Kakuchi J, Ichiki T, Kiyama S, Hogan BL, Fogo A, Inagami T, Ichikawa I. Developmental expression of renal angiotensin II receptor genes in the mouse. Kidney Int 1995; 47:140-7. [PMID: 7731139 DOI: 10.1038/ki.1995.16] [Citation(s) in RCA: 125] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The cellular distribution of angiotensin II type 1 (AT1) and type 2 (AT2) receptor mRNA was examined in mouse kidneys at several embryonic stages (12 to 18 days; 19 days = full term) and up to three weeks after birth by in situ hybridization. The expression of both AT1 and AT2 mRNAs appeared simultaneously at 14 days of gestation. However, their distributions were contrasting: AT1 mRNA was expressed in mature glomeruli and maturing S-shaped bodies throughout the stages examined. AT1 expression was also detected at 16 days of gestation in the proximal and distal tubules and peaked at the end of gestation. Both the temporal and spatial expression of AT1 coincide with the differentiation and proliferation of glomerular mesangial and tubular cells during nephrogenesis. In contrast, AT2 mRNA was present only in the mesenchymal cells adjacent to the stalk of the ureter bud at early developmental stages, and, later, extended to the mesenchymal cells located near, but outside, the nephrogenic area of superficial cortex and also the cells between collecting ducts. AT2 expression in these regions decreased markedly within three weeks after birth. Temporally and spatially, AT2 mRNA expression coincides with the epithelial-mesenchymal interactions that take place during early phases of nephrogenesis. The site of AT2 expression also overlaps closely with that of a specific group of cells which undergo apoptosis following nephrogenesis. Thus, contrary to current belief, the activation of AT1 and AT2 genes takes place in different cell types of the kidney during embryonic development, and thereby conceivably contributes to the ontogeny of those specific renal cells.
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Affiliation(s)
- J Kakuchi
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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