1
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Annana SK, Ferdoush J, Lamia F, Roy A, Kar P, Nandi M, Kabir M, Saha A. Computational Insights into Captopril's Inhibitory Potential Against MMP9 and LCN2 in Bladder Cancer: Implications for Therapeutic Application. Cancer Inform 2024; 23:11769351241276759. [PMID: 39315330 PMCID: PMC11418319 DOI: 10.1177/11769351241276759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 07/31/2024] [Indexed: 09/25/2024] Open
Abstract
Objectives Captopril is a commonly used therapeutic agent in the management of renovascular hypertension (high blood pressure), congestive heart failure, left ventricular dysfunction following myocardial infarction, and nephropathy. Captopril has been found to interact with proteins that are significantly associated with bladder cancer (BLCA), suggesting that it could be a potential medication for BLCA patients with concurrent hypertension. Methods DrugBank 5.0 was utilized to identify the direct protein targets (DPTs) of captopril. STRING was used to analyze the multiple protein interactions. TNMPlot was used for comparing gene expression in normal, tumor, and metastatic tissue. Then, docking with target proteins was done using Autodock. Molecular dynamics simulations were applied for estimate the diffusion coefficients and mean-square displacements in materials. Results Among all these proteins, MMP9 is observed to be an overexpressed gene in BLCA and its increased expression is linked to reduced survival in patients. Our findings indicate that captopril effectively inhibits both the wild type and common mutated forms of MMP9 in BLCA. Furthermore, the LCN2 gene, which is also overexpressed in BLCA, interacts with captopril-associated proteins. The overexpression of LCN2 is similarly associated with reduced survival in BLCA. Through molecular docking analysis, we have identified specific amino acid residues (Tyr179, Pro421, Tyr423, and Lys603) at the active pocket of MMP9, as well as Tyr78, Tyr106, Phe145, Lys147, and Lys156 at the active pocket of LCN2, with which captopril interacts. Thus, our data provide compelling evidence for the inhibitory potential of captopril against human proteins MMP9 and LCN2, both of which play crucial roles in BLCA. Conclusion These discoveries present promising prospects for conducting subsequent validation studies both in vitro and in vivo, with the aim of assessing the suitability of captopril for treating BLCA patients, irrespective of their hypertension status, who exhibit elevated levels of MMP9 and LCN2 expression.
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Affiliation(s)
- Sanjida Kabir Annana
- Department of Genetic Engineering and Biotechnology, East West University, Dhaka, Bangladesh
| | - Jannatul Ferdoush
- Department of Biology, Geology and Environmental Science, University of Tennessee at Chattanooga, Chattanooga, TN, USA
| | - Farzia Lamia
- Department of Genetic Engineering and Biotechnology, East West University, Dhaka, Bangladesh
| | - Ayan Roy
- Department of Bioinformatics and Biotechnology, Asian University for Women, Chattogram, Bangladesh
| | - Pallab Kar
- Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Monisha Nandi
- Department of Pharmacy, BGC Trust University Bangladesh, Chattogram, Bangladesh
| | - Maliha Kabir
- Department of Bioinformatics and Biotechnology, Asian University for Women, Chattogram, Bangladesh
| | - Ayan Saha
- Department of Bioinformatics and Biotechnology, Asian University for Women, Chattogram, Bangladesh
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2
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Silva WR, Oliveira LFM, Sotomayor MDPT, Petruci JFDS. Development of a "turn off" fluorescent molecularly imprinted nanoparticle-based sensor for selective captopril quantification in synthetic urine and wastewater samples. Mikrochim Acta 2024; 191:374. [PMID: 38847878 DOI: 10.1007/s00604-024-06446-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Accepted: 05/22/2024] [Indexed: 06/12/2024]
Abstract
The combination of silica nanoparticles with fluorescent molecularly imprinted polymers (Si-FMIPs) prepared by a one-pot sol-gel synthesis method to act as chemical sensors for the selective and sensitive determination of captopril is described. Several analytical parameters were optimized, including reagent ratio, solvent, concentration of Si-FMIP solutions, and contact time. Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and the ninhydrin assay were used for characterization. The selectivity was evaluated against molecules belonging to other drug classes, such as fluoroquinolones, nonacid nonopioids, benzothiadiazine, alpha amino acids, and nitroimidazoles. Under optimized conditions, the Si-FMIP-based sensor exhibited a working range of 1-15 µM, with a limit of detection (LOD) of 0.7 µM, repeatability of 6.4% (n = 10), and suitable recovery values at three concentration levels (98.5% (1.5 µM), 99.9% (3.5 µM), and 99.2% (7.5 µM)) for wastewater samples. The sensor provided a working range of 0.5-15 µM for synthetic urine samples, with an LOD of 0.4 µM and a repeatability of 7.4% (n = 10) and recovery values of 93.7%, 92.9%, and 98.0% for 1.0 µM, 3.5 µM, and 10 µM, respectively. In conclusion, our single-vessel synthesis approach for Si-FMIPs proved to be highly effective for the selective determination of captopril in wastewater and synthetic urine samples.
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Affiliation(s)
- Weida Rodrigues Silva
- Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | | | - Maria Del Pilar Taboada Sotomayor
- Institute of Chemistry, São Paulo State University (UNESP) and National Institute of Alternative Technologies for Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactive Agents (INCT-DATREM), Araraquara, 14801-970, Brazil
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3
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Exploring the Impact of ACE Inhibition in Immunity and Disease. J Renin Angiotensin Aldosterone Syst 2022; 2022:9028969. [PMID: 36016727 PMCID: PMC9371878 DOI: 10.1155/2022/9028969] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 07/07/2022] [Indexed: 11/18/2022] Open
Abstract
Angiotensin-converting enzyme (ACE) is a zinc-dependent dipeptidyl carboxypeptidase and is crucial in the renin-angiotensin-aldosterone system (RAAS) but also implicated in immune regulation. Intrinsic ACE has been detected in several immune cell populations, including macrophages and neutrophils, where its overexpression results in enhanced bactericidal and antitumour responses, independent of angiotensin II. With roles in antigen presentation and inflammation, the impact of ACE inhibitors must be explored to understand how ACE inhibition may impact our ability to clear infections or malignancy, particularly in the wake of the coronavirus (SARS-CoV2) pandemic and as antibiotic resistance grows. Patients using ACE inhibitors may be more at risk of postsurgical complications as ACE inhibition in human neutrophils results in decreased ROS and phagocytosis whilst angiotensin receptor blockers (ARBs) have no effect. In contrast, ACE is also elevated in certain autoimmune diseases such as rheumatoid arthritis and lupus, and its inhibition benefits patient outcome where inflammatory immune cells are overactive. Although the ACE autoimmune landscape is changing, some studies have conflicting results and require further input. This review seeks to highlight the need for further research covering ACE inhibitor therapeutics and their potential role in improving autoimmune conditions, cancer, or how they may contribute to immunocompromise during infection and neurodegenerative diseases. Understanding ACE inhibition in immune cells is a developing field that will alter how ACE inhibitors are designed in future and aid in developing therapeutic interventions.
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4
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Chang JC, Weiss PF, Xiao R, Atkinson MA, Wenderfer SE. Use of renin angiotensin aldosterone system inhibitors in children with lupus and time to glucocorticoid discontinuation. Kidney Int 2022; 102:395-404. [PMID: 35618096 PMCID: PMC9329244 DOI: 10.1016/j.kint.2022.04.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 03/07/2022] [Accepted: 04/08/2022] [Indexed: 02/06/2023]
Abstract
There is little data to inform use of renin angiotensin aldosterone system (RAAS) inhibitors in pediatric patients with systemic lupus erythematosus (SLE). Here, we sought to characterize RAAS inhibitor use in pediatric SLE, and determine whether early RAAS inhibitor initiation among children with incident lupus nephritis is associated with decreased duration of chronic glucocorticoid exposure. A retrospective cohort study was performed of children (ages 5-18) with SLE and/or lupus nephritis in the Truven MarketScanΤΜ Medicaid and Commercial databases (2013-2018) and estimated RAAS inhibitor use. Among incident nephritis cases, we used competing risk hazard models with inverse probability of treatment weighting to estimate the association between RAAS inhibitor initiation less than 180 days after diagnosis and time to glucocorticoid discontinuation with kidney failure as a competing event. Among 592 children with nephritis and 1407 children with non-kidney SLE, 67% and 15% ever received RAAS inhibitors, respectively. Median duration of RAAS inhibitor use among 323 incident users was 14 and 9 months in children with and without nephritis, respectively. Medicaid enrollment was independently associated with greater likelihood of RAAS inhibitor use, irrespective of nephritis. Among 158 incident nephritis cases, early RAAS inhibitor initiation was significantly associated with a faster rate of glucocorticoid discontinuation (adjusted sub-distribution hazard ratio 1.81, 95% confidence interval [1.09 - 3.00]). Thus, early initiation of RAAS inhibitors may have a role in children newly diagnosed with lupus nephritis; not only those with refractory proteinuria after induction therapy. Hence, integrated health systems data could be leveraged to confirm these findings and optimize adjunctive therapies in pediatric lupus.
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Affiliation(s)
- Joyce C Chang
- Center for Pediatric Clinical Effectiveness, The Children's Hospital of Philadelphia Research Institute, Philadelphia PA; Division of Immunology, Boston Children's Hospital and Harvard Medical School, Boston MA; Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia PA.
| | - Pamela F Weiss
- Center for Pediatric Clinical Effectiveness, The Children's Hospital of Philadelphia Research Institute, Philadelphia PA; Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia PA; Division of Rheumatology, The Children's Hospital of Philadelphia, Philadelphia PA
| | - Rui Xiao
- Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | | | - Scott E Wenderfer
- Pediatric Nephrology, Baylor College of Medicine, Texas Children's Hospital, Houston TX
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5
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Eekhoudt CR, Bortoluzzi T, Varghese SS, Cheung DYC, Christie S, Eastman S, Mittal I, Austria JA, Aukema HM, Ravandi A, Thliveris J, Singal PK, Jassal DS. Comparing Flaxseed and Perindopril in the Prevention of Doxorubicin and Trastuzumab-Induced Cardiotoxicity in C57Bl/6 Mice. Curr Oncol 2022; 29:2941-2953. [PMID: 35621631 PMCID: PMC9139942 DOI: 10.3390/curroncol29050241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/15/2022] [Accepted: 04/17/2022] [Indexed: 11/28/2022] Open
Abstract
Background: Two anti-cancer agents, doxorubicin (DOX) and trastuzumab (TRZ), are commonly used in the management of breast cancer in women. Despite their efficacy in reducing the morbidity and mortality of individuals with breast cancer, the use of these agents is limited by adverse cardiotoxic side effects. Both the nutraceutical agent flaxseed (FLX) and the pharmaceutical drug perindopril (PER) have been studied individually in the prevention of chemotherapy-mediated cardiac dysfunction. The objective of this study was to determine whether the prophylactic administration of FLX is comparable and/or synergistic with PER in preventing DOX + TRZ-induced cardiotoxicity. Methods: Over a six-week period, 81 wild-type C57Bl/6 female mice (8–12 weeks old) were randomized to receive regular chow (RC) or 10% FLX-supplemented diets with or without PER (3 mg/kg/week; oral gavage). Starting at week 4, mice were randomized to receive a weekly injection of saline or DOX (8 mg/kg) + TRZ (3 mg/kg). Serial echocardiography was conducted weekly and histological and biochemical analyses were performed at the end of the study. Results: In mice treated with RC + DOX + TRZ, left ventricular ejection (LVEF) decreased from 75 ± 2% at baseline to 37 ± 3% at week 6. However, prophylactic treatment with either FLX, PER, or FLX + PER partially preserved left ventricular systolic function with LVEF values of 61 ± 2%, 62 ± 2%, and 64 ± 2%, respectively. The administration of FLX, PER, or FLX + PER was also partially cardioprotective in preserving cardiomyocyte integrity and attenuating the expression of the inflammatory biomarker NF-κB due to DOX + TRZ administration. Conclusion: FLX was equivalent to PER at preventing DOX + TRZ-induced cardiotoxicity in a chronic in vivo murine model.
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Affiliation(s)
- Cameron R. Eekhoudt
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - Tessa Bortoluzzi
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - Sonu S. Varghese
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - David Y. C. Cheung
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - Simon Christie
- Section of Cardiology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Room GC430, Health Sciences Centre 820 Sherbrook Street, Winnipeg, MB R3A 1R9, Canada;
| | - Skyler Eastman
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - Ishika Mittal
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - J. Alejandro Austria
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - Harold M. Aukema
- Canadian Centre for Agri-Food Research in Health and Medicine, Department of Food and Human Nutritional Sciences, University of Manitoba, Room W573 Duff Roblin Building, Winnipeg, MB R3T 2N2, Canada;
| | - Amir Ravandi
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
- Section of Cardiology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Room GC430, Health Sciences Centre 820 Sherbrook Street, Winnipeg, MB R3A 1R9, Canada;
| | - James Thliveris
- Department of Human Anatomy and Cell Sciences, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 130 Basic Medical Science Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada;
| | - Pawan K. Singal
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
| | - Davinder S. Jassal
- Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, 432 Basic Medical Sciences Building, 745 Bannatyne Avenue, Winnipeg, MB R3E 0J9, Canada; (C.R.E.); (T.B.); (S.S.V.); (D.Y.C.C.); (S.E.); (I.M.); (J.A.A.); (A.R.); (P.K.S.)
- Section of Cardiology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Room GC430, Health Sciences Centre 820 Sherbrook Street, Winnipeg, MB R3A 1R9, Canada;
- Department of Radiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Room GA216, 820 Sherbrook Street, Winnipeg, MB R3T 2N2, Canada
- Correspondence: ; Tel.: +1-(204)-258-1290; Fax: +1-(204)-233-2157
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6
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Sahin B, Ergul M. Captopril exhibits protective effects through anti-inflammatory and anti-apoptotic pathways against hydrogen peroxide-induced oxidative stress in C6 glioma cells. Metab Brain Dis 2022; 37:1221-1230. [PMID: 35286533 DOI: 10.1007/s11011-022-00948-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 03/01/2022] [Indexed: 10/18/2022]
Abstract
Recent studies have shown that angiotensin-converting enzyme (ACE) inhibitors have reduced oxidative damage in the central nervous system (CNS). Accumulating evidence have also demonstrated that captopril, an ACE inhibitor, has protective effects on the CNS. However, its effects on hydrogen peroxide (H2O2)-induced oxidative damage in glial cells and interaction with the inflammatory system are still uncertain. Therefore, this study was aimed to investigate the protective effect of captopril on glial cell damage after H2O2-induced oxidative stress involved in the inflammatory and apoptotic pathways. The control group was without any treatment, and the H2O2 group was treated with 0.5 mM H2O2 for 24 h. The captopril group was treated with various concentrations of captopril for 24 h. The captopril + H2O2 group was pre-treated with captopril for 1 h and then exposed to 0.5 mM H2O2 for 24 h. In the captopril + H2O2 group, captopril at all concentrations significantly increased the cell viability in C6 cells. It also significantly increased the TAS and decreased the TOS levels which are an indicator of oxidative stress. Moreover, captopril significantly reduced the inflammation markers including NF-kB, IL-1 β, COX-1, and COX-2 levels. Flow cytometry results also exhibited that captopril pretreatment significantly decreased the apoptosis rate. Besides, captopril significantly reduced apoptotic Bax and raised anti-apoptotic Bcl-2 protein levels. In conclusion, captopril has protective effects on C6 cells after H2O2-induced oxidative damage by inhibiting oxidative stress, inflammation, and apoptosis. However, further studies need to be conducted to evaluate the potential of captopril as a neuroprotective agent.
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Affiliation(s)
- Bilal Sahin
- Departments of Physiology, School of Medicine, Sivas Cumhuriyet University, TR-58140, Sivas, Turkey.
| | - Mustafa Ergul
- Departments of Biochemistry, School of Pharmacy, Sivas Cumhuriyet University, Sivas, TR-58140, Turkey
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7
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Diamond B, Volpe BT, VanPatten S, Al Abed Y. SARS-CoV-2 and interferon blockade. Mol Med 2020; 26:103. [PMID: 33167852 PMCID: PMC7652589 DOI: 10.1186/s10020-020-00231-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 10/22/2020] [Indexed: 01/08/2023] Open
Abstract
The response to viral infection generally includes an activation of the adaptive immune response to produce cytotoxic T cells and neutralizing antibodies. We propose that SARS-CoV-2 activates the innate immune system through the renin-angiotensin and kallikrein-bradykinin pathways, blocks interferon production and reduces an effective adaptive immune response. This model has therapeutic implications.
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Affiliation(s)
- Betty Diamond
- Center for Molecular Medicine, The Feinstein Institute for Medical Research, 350 Community Drive, Manhasset, NY, 11030, USA
| | - Bruce T Volpe
- Center for Molecular Medicine, The Feinstein Institute for Medical Research, 350 Community Drive, Manhasset, NY, 11030, USA.
| | - Sonya VanPatten
- Center for Bioelectronic Medicine, The Feinstein Institute for Medical Research, 350 Community Drive, Manhasset, NY, 11030, USA
| | - Yousef Al Abed
- Center for Bioelectronic Medicine, The Feinstein Institute for Medical Research, 350 Community Drive, Manhasset, NY, 11030, USA
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8
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Solid-Phase Insertion of N-mercaptoalkylglycine Residues into Peptides. Molecules 2019; 24:molecules24234261. [PMID: 31766740 PMCID: PMC6930625 DOI: 10.3390/molecules24234261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 11/18/2019] [Accepted: 11/20/2019] [Indexed: 11/18/2022] Open
Abstract
N-mercaptoalkylglycine residues were inserted into peptides by reacting N-free amino groups of peptides, which were initially synthesized on 2-chlorotrityl resin (Cltr) using the Fmoc/tBu method, with bromoacetic acid and subsequent nucleophilic replacement of the bromide by reacting with S-4-methoxytrityl- (Mmt)/S-trityl- (Trt) protected aminothiols. The synthesized thiols containing peptide–peptoid hybrids were cleaved from the resin, either protected by treatment with dichloromethane (DCM)/trifluoroethanol (TFE)/acetic acid (AcOH) (7:2:1), or deprotected (fully or partially) by treatment with trifluoroacetic acid (TFA) solution using triethylsilane (TES) as a scavenger.
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9
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Seliga A, Lee MH, Fernandes NC, Zuluaga-Ramirez V, Didukh M, Persidsky Y, Potula R, Gallucci S, Sriram U. Kallikrein-Kinin System Suppresses Type I Interferon Responses: A Novel Pathway of Interferon Regulation. Front Immunol 2018; 9:156. [PMID: 29456540 PMCID: PMC5801412 DOI: 10.3389/fimmu.2018.00156] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 01/17/2018] [Indexed: 01/13/2023] Open
Abstract
The Kallikrein–Kinin System (KKS), comprised of kallikreins (klks), bradykinins (BKs) angiotensin-converting enzyme (ACE), and many other molecules, regulates a number of physiological processes, including inflammation, coagulation, angiogenesis, and control of blood pressure. In this report, we show that KKS regulates Type I IFN responses, thought to be important in lupus pathogenesis. We used CpG (TLR9 ligand), R848 (TLR7 ligand), or recombinant IFN-α to induce interferon-stimulated genes (ISGs) and proteins, and observed that this response was markedly diminished by BKs, klk1 (tissue kallikrein), or captopril (an ACE inhibitor). BKs significantly decreased the ISGs induced by TLRs in vitro and in vivo (in normal and lupus-prone mice), and in human PBMCs, especially the induction of Irf7 gene (p < 0.05), the master regulator of Type I IFNs. ISGs induced by IFN-α were also suppressed by the KKS. MHC Class I upregulation, a classic response to Type I IFNs, was reduced by BKs in murine dendritic cells (DCs). BKs decreased phosphorylation of STAT2 molecules that mediate IFN signaling. Among the secreted pro-inflammatory cytokines/chemokines analyzed (IL-6, IL12p70, and CXCL10), the strongest suppressive effect was on CXCL10, a highly Type I IFN-dependent cytokine, upon CpG stimulation, both in normal and lupus-prone DCs. klks that break down into BKs, also suppressed CpG-induced ISGs in murine DCs. Captopril, a drug that inhibits ACE and increases BK, suppressed ISGs, both in mouse DCs and human PBMCs. The effects of BK were reversed with indomethacin (compound that inhibits production of PGE2), suggesting that BK suppression of IFN responses may be mediated via prostaglandins. These results highlight a novel regulatory mechanism in which members of the KKS control the Type I IFN response and suggest a role for modulators of IFNs in the pathogenesis of lupus and interferonopathies.
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Affiliation(s)
- Alecia Seliga
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
| | - Michael Hweemoon Lee
- Laboratory of Dendritic Cell Biology, Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, United States
| | - Nicole C Fernandes
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
| | - Viviana Zuluaga-Ramirez
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
| | - Marta Didukh
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
| | - Yuri Persidsky
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
| | - Raghava Potula
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
| | - Stefania Gallucci
- Laboratory of Dendritic Cell Biology, Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, United States
| | - Uma Sriram
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, United States
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10
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Valachová K, Baňasová M, Topoľská D, Sasinková V, Juránek I, Collins MN, Šoltés L. Influence of tiopronin, captopril and levamisole therapeutics on the oxidative degradation of hyaluronan. Carbohydr Polym 2015; 134:516-23. [DOI: 10.1016/j.carbpol.2015.07.029] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 06/19/2015] [Accepted: 07/08/2015] [Indexed: 11/29/2022]
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11
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Chang Y, Wei W. Angiotensin II in inflammation, immunity and rheumatoid arthritis. Clin Exp Immunol 2015; 179:137-45. [PMID: 25302847 DOI: 10.1111/cei.12467] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/04/2014] [Indexed: 12/22/2022] Open
Abstract
Rheumatoid arthritis (RA) is an autoimmune inflammatory disease that is characterized by increased cardiovascular morbidity and mortality, independent of the traditional risk factors for cardiovascular disease. Although classically known for its role in the regulation of circulatory homeostasis, angiotensin II (Ang II) is recognized to act as a powerful proinflammatory mediator. Some research has showed that Ang II plays important roles in autoimmune diseases, including RA, systemic lupus erythematosus and multiple sclerosis. Ang II blockers prove effective in reducing inflammation and autoimmunity in rheumatic diseases and their relative safety, together with their effects for reducing the cardiovascular disease risk, suggest that Ang II blockers may at least act as effective adjunctive therapy for disease control in patients with RA. The present review focuses systematically on the potential impact of Ang II and its receptors on inflammation and immunomodulation in patients with RA.
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Affiliation(s)
- Y Chang
- Institute of Clinical Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immune Medicine, Ministry of Education, Hefei, China
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Ackerman Z, Grozovski M, Oron-Herman M, Rosenthal T, Sela BA, Amir G. Effects of Antihypertensive and Triglyceride Lowering Agents on Splenocyte Apoptosis in Rats with Fatty Liver. Basic Clin Pharmacol Toxicol 2013; 113:37-42. [DOI: 10.1111/bcpt.12067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Accepted: 02/25/2013] [Indexed: 01/20/2023]
Affiliation(s)
- Zvi Ackerman
- Department of Medicine; Hadassah-Hebrew University Medical Center; Jerusalem; Israel
| | | | | | - Talma Rosenthal
- Sackler Faculty of Medicine; Tel Aviv University; Tel Aviv; Israel
| | - Ben-Ami Sela
- Institute of Chemical Pathology; Sheba Medical Center; Tel Hashomer; Israel
| | - Gail Amir
- Department of Pathology; Hadassah-Hebrew University Medical Center; Jerusalem; Israel
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13
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Vitetta L, Gobe G. Uremia and chronic kidney disease: the role of the gut microflora and therapies with pro- and prebiotics. Mol Nutr Food Res 2013; 57:824-32. [PMID: 23450842 DOI: 10.1002/mnfr.201200714] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 12/10/2012] [Accepted: 12/18/2012] [Indexed: 12/17/2022]
Abstract
Uremia is an illness that accompanies kidney failure and chronic kidney disease (CKD). Uremic illness is considered to be due largely to the accumulation of organic waste products that are normally cleared by the kidneys. However, uremic retention solutes are generated in part in the gastrointestinal tract (GIT), with the gut microbiota and the ensuing micro-biometabolome playing a significant role in the proliferation of uremic retention solutes. Toxins generated in, or introduced into the body via the intestine, such as advanced glycation end products, phenols, and indoles, all may contribute to the pathogenesis of CKD. Hence, it is biologically plausible, but not well recognized, that an important participant in the toxic load that contributes to CKD originates in the GIT. The microbiota that colonize the GIT perform a number of functions that include regulating the normal development and function of the mucosal barriers; assisting with maturation of immunological tissues, which in turn promotes immunological tolerance to antigens from foods, the environment, or potentially pathogenic organisms; controlling nutrient uptake and metabolism; and preventing propagation of pathogenic micro-organisms. Here, we develop a hypothesis that probiotics and prebiotics have a therapeutic role in maintaining a metabolically balanced GIT, and reducing progression of CKD and associated uremia.
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Affiliation(s)
- Luis Vitetta
- Centre for Integrative Clinical and Molecular Medicine, School of Medicine at Princess Alexandra Hospital, The University of Queensland, Brisbane, Australia
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14
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de Jong HJI, Vandebriel RJ, Saldi SRF, van Dijk L, van Loveren H, Cohen Tervaert JW, Klungel OH. Angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers and the risk of developing rheumatoid arthritis in antihypertensive drug users. Pharmacoepidemiol Drug Saf 2012; 21:835-43. [PMID: 22674737 DOI: 10.1002/pds.3291] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 03/09/2012] [Accepted: 04/12/2012] [Indexed: 12/13/2022]
Abstract
PURPOSE Angiotensin-converting enzyme (ACE) inhibitors and angiotensin II receptor blockers (ARBs) are effective in the treatment of cardiovascular disease. Next to effects on hypertension and cardiac function, these drugs have anti-inflammatory and immunomodulating properties which may either facilitate or protect against the development of autoimmunity, potentially resulting in autoimmune diseases. Therefore, we determined in the current study the association between ACE inhibitor and ARB use and incident rheumatoid arthritis (RA). METHODS A matched case-control study was conducted among patients treated with antihypertensive drugs using the Netherlands Information Network of General Practice (LINH) database in 2001-2006. Cases were patients with a first-time diagnosis of RA. Each case was matched to five controls for age, sex, and index date, which was selected 1 year before the first diagnosis of RA. ACE inhibitor and ARB exposure was considered to be any prescription issued in the period before index date. Logistic regression analysis was used to estimate odds ratios (ORs) and their 95% confidence intervals (CI). RESULTS Our study included 211 cases and 667 matched controls. After controlling for potential confounders, ever use of ACE inhibitors or ARBs was not associated with incident RA (adjusted ORs [95%CI], 0.99 [0.55-1.79] and 1.02 [0.67-1.56], respectively). The adjusted ORs (95%CI) for current and past use of ACE inhibitors were 1.18 (0.75-1.85) and 0.61 (0.28-1.35). For current and past use of ARBs, these adjusted ORs (95%CI) were 1.40 (0.80-2.45) and 0.29 (0.05-1.67), respectively. No duration and dose-effect relationship was observed. CONCLUSIONS ACE inhibitor or ARB use is not associated with incident RA.
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Affiliation(s)
- Hilda J I de Jong
- Laboratory for Health Protection Research, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
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15
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Wang W, Xiao W, Sun L, Zhang C, Chen G, Yang H. Inhibition of ACE activity contributes to the intestinal structural compensation in a massive intestinal resection rat model. Pediatr Surg Int 2012; 28:533-41. [PMID: 22441330 DOI: 10.1007/s00383-012-3075-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/07/2012] [Indexed: 01/27/2023]
Abstract
BACKGROUND Intestinal adaptation in short bowel syndrome (SBS) consists of increased epithelial cells (ECs) proliferation as well as apoptosis. Angiotensin-converting enzyme (ACE) has been shown to regulate ECs apoptosis. In this study, we investigated the effect of ACE inhibition on intestinal adaptation after small bowel resection (SBR) in a rat model. METHODS Sprague-Dawley rats were used and were divided into four groups: (1) Sham group received an ileum transection (n = 6); (2) Sham + ACE-I group received an ileum transaction and lavage with ACE inhibitor (ACE-I, enalaprilat, 2 mg/kg/day) (n = 6); (3) SBS group received a 70 % mid-intestinal resection (n = 6); (4) SBS + ACE-I group received a 70 % mid-intestinal resection and lavage with enalaprilat (2 mg/kg/day) (n = 6). Sampling was done 10 days after surgery. ECs apoptosis was studied by TUNEL staining. ACE, angiotensin II (ANGII) receptor type 1 (AT1R) and receptor type 2 (AT2R) expressions were detected with RT-PCR and immunofluorescent confocal microscopy. RESULTS SBR leads to significant intestinal hypertrophy. The addition of ACE-I to SBS rat resulted in a significant decline in ECs apoptosis. ACE mRNA expression was significantly elevated after SBS creation (0.24 ± 0.07 vs. 0.42 ± 0.11), and ACE-I administration further increased mucosal ACE mRNA expression (0.54 ± 0.12). Interestingly, AT1R mRNA expression showed a significant decline in the SBS group compared to Sham levels, and ACE-I administration increased AT1R mRNA expression to Sham levels. No significant difference in AT2R mRNA expression was found between Sham and SBS group. CONCLUSION These results offer further insight into the role of ACE on intestinal mucosal remolding after massive bowel resection. ACE-I may be beneficial to SBS patients via a reduction of the apoptotic rate, thus facilitating the degree of adaptation.
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Affiliation(s)
- Wensheng Wang
- Department of General Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, China
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16
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Locally administrated perindopril improves healing in an ovariectomized rat tibial osteotomy model. PLoS One 2012; 7:e33228. [PMID: 22427998 PMCID: PMC3302837 DOI: 10.1371/journal.pone.0033228] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Accepted: 02/06/2012] [Indexed: 11/24/2022] Open
Abstract
Angiotensin-converting enzyme inhibitors are widely prescribed to regulate blood pressure. High doses of orally administered perindopril have previously been shown to improve fracture healing in a mouse femur fracture model. In this study, perindopril was administered directly to the fracture area with the goal of stimulating fracture repair. Three months after being ovariectomized (OVX), tibial fractures were produced in Sprague–Dawley rats and subsequently stabilized with intramedullary wires. Perindopril (0.4 mg/kg/day) was injected locally at the fractured site for a treatment period of 7 days. Vehicle reagent was used as a control. Callus quality was evaluated at 2 and 4 weeks post-fracture. Compared with the vehicle group, perindopril treatment significantly increased bone formation, increased biomechanical strength, and improved microstructural parameters of the callus. Newly woven bone was arranged more tightly and regularly at 4 weeks post-fracture. The ultimate load increased by 66.1 and 76.9% (p<0.01), and the bone volume over total volume (BV/TV) increased by 29.9% and 24.3% (p<0.01) at 2 and 4 weeks post-fracture, respectively. These findings suggest that local treatment with perindopril could promote fracture healing in ovariectomized rats.
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17
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Coelho dos Santos JS, Menezes CAS, Villani FNA, Magalhães LMD, Scharfstein J, Gollob KJ, Dutra WO. Captopril increases the intensity of monocyte infection by Trypanosoma cruzi and induces human T helper type 17 cells. Clin Exp Immunol 2010; 162:528-36. [PMID: 20964644 DOI: 10.1111/j.1365-2249.2010.04270.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The anti-hypertensive drug captopril is used commonly to reduce blood pressure of patients with severe forms of Chagas disease, a cardiomyopathy caused by chronic infection with the intracellular protozoan Trypanosoma cruzi. Captopril acts by inhibiting angiotensin-converting enzyme (ACE), the vasopressor metallopeptidase that generates angiotensin II and promotes the degradation of bradykinin (BK). Recent studies in mice models of Chagas disease indicated that captopril can potentiate the T helper type 1 (Th1)-directing natural adjuvant property of BK. Equipped with kinin-releasing cysteine proteases, T. cruzi trypomastigotes were shown previously to invade non-professional phagocytic cells, such as human endothelial cells and murine cardiomyocytes, through the signalling of G protein-coupled bradykinin receptors (B(2) KR). Monocytes are also parasitized by T. cruzi and these cells are known to be important for the host immune response during infection. Here we showed that captopril increases the intensity of T. cruzi infection of human monocytes in vitro. The increased parasitism was accompanied by up-regulated expression of ACE in human monocytes. While T. cruzi infection increased the expression of interleukin (IL)-10 by monocytes significantly, compared to uninfected cells, T. cruzi infection in association with captopril down-modulated IL-10 expression by the monocytes. Surprisingly, studies with peripheral blood mononuclear cells revealed that addition of the ACE inhibitor in association with T. cruzi increased expression of IL-17 by CD4(+) T cells in a B(2) KR-dependent manner. Collectively, our results suggest that captopril might interfere with host-parasite equilibrium by enhancing infection of monocytes, decreasing the expression of the modulatory cytokine IL-10, while guiding development of the proinflammatory Th17 subset.
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Affiliation(s)
- J S Coelho dos Santos
- Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
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18
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Garcia P, Schwenzer S, Slotta JE, Scheuer C, Tami AE, Holstein JH, Histing T, Burkhardt M, Pohlemann T, Menger MD. Inhibition of angiotensin-converting enzyme stimulates fracture healing and periosteal callus formation - role of a local renin-angiotensin system. Br J Pharmacol 2010; 159:1672-80. [PMID: 20233225 DOI: 10.1111/j.1476-5381.2010.00651.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND AND PURPOSE The renin-angiotensin system (RAS) regulates blood pressure and electrolyte homeostasis. In addition, 'local' tissue-specific RAS have been identified, regulating regeneration, cell growth, apoptosis, inflammation and angiogenesis. Although components of the RAS are expressed in osteoblasts and osteoclasts, a local RAS in bone has not yet been described and there is no information on whether the RAS is involved in fracture healing. Therefore, we studied the expression and function of the key RAS component, angiotensin-converting enzyme (ACE), during fracture healing. EXPERIMENTAL APPROACH In a murine femur fracture model, animals were treated with the ACE inhibitor perindopril or vehicle only. Fracture healing was analysed after 2, 5 and 10 weeks using X-ray, micro-CT, histomorphometry, immunohistochemistry, Western blotting and biomechanical testing. KEY RESULTS ACE was expressed in osteoblasts and hypertrophic chondrocytes in the periosteal callus during fracture healing, accompanied by expression of the angiotensin type-1 and type-2 receptors. Perindopril treatment reduced blood pressure and bone mineral density in unfractured femora. However, it improved periosteal callus formation, bone bridging of the fracture gap and torsional stiffness. ACE inhibition did not affect cell proliferation, but reduced apoptotic cell death. After 10 week treatment, a smaller callus diameter and bone volume after perindopril treatment indicated an advanced stage of bone remodelling. CONCLUSIONS Our study provides evidence for a local RAS in bone that influenced the process of fracture healing. We show for the first time that inhibition of ACE is capable of accelerating bone healing and remodelling.
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Affiliation(s)
- P Garcia
- Department of Trauma-, Hand- and Reconstructive Surgery, University of Saarland, Homburg/Saar, Germany.
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Haxhija EQ, Yang H, Spencer AU, Koga H, Sun X, Teitelbaum DH. Modulation of mouse intestinal epithelial cell turnover in the absence of angiotensin converting enzyme. Am J Physiol Gastrointest Liver Physiol 2008; 295:G88-G98. [PMID: 18483182 PMCID: PMC2494725 DOI: 10.1152/ajpgi.00589.2007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Angiotensin converting enzyme (ACE) has been shown to be involved in regulation of apoptosis in nonintestinal tissues. This study examined the role of ACE in the modulation of intestinal adaptation utilizing ACE knockout mice (ACE-/-). A 60% small bowel resection (SBR) was used, since this model results in a significant increase in intestinal epithelial cell (EC) apoptosis as well as proliferation. Baseline villus height, crypt depth, and intestinal EC proliferation were higher, and EC apoptosis rates were lower in ACE-/- compared with ACE+/+ mice. After SBR, EC apoptosis rates remained significantly lower in ACE-/- compared with ACE+/+ mice. Furthermore, villus height and crypt depth after SBR continued to be higher in ACE-/- mice. The finding of a lower bax-to-bcl-2 protein ratio in ACE-/- mice may account for reduced EC apoptotic rates after SBR in ACE-/- compared with ACE+/+ mice. The baseline higher rate of EC proliferation in ACE-/- compared with ACE+/+ mice may be due to an increase in the expression of several EC growth factor receptors. In conclusion, ACE appears to have an important role in the modulation of intestinal EC apoptosis and proliferation and suggests that the presence of ACE in the intestinal epithelium has a critical role in guiding epithelial cell adaptive response.
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Affiliation(s)
- Emir Q. Haxhija
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, and C. S. Mott Children's Hospital, Ann Arbor, Michigan; and Department of Pediatric Surgery, Medical University Graz, Graz, Austria
| | - Hua Yang
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, and C. S. Mott Children's Hospital, Ann Arbor, Michigan; and Department of Pediatric Surgery, Medical University Graz, Graz, Austria
| | - Ariel U. Spencer
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, and C. S. Mott Children's Hospital, Ann Arbor, Michigan; and Department of Pediatric Surgery, Medical University Graz, Graz, Austria
| | - Hiroyuki Koga
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, and C. S. Mott Children's Hospital, Ann Arbor, Michigan; and Department of Pediatric Surgery, Medical University Graz, Graz, Austria
| | - Xiaoyi Sun
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, and C. S. Mott Children's Hospital, Ann Arbor, Michigan; and Department of Pediatric Surgery, Medical University Graz, Graz, Austria
| | - Daniel H. Teitelbaum
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, and C. S. Mott Children's Hospital, Ann Arbor, Michigan; and Department of Pediatric Surgery, Medical University Graz, Graz, Austria
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20
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Wildhaber BE, Yang H, Haxhija EQ, Spencer AU, Teitelbaum DH. Intestinal intraepithelial lymphocyte derived angiotensin converting enzyme modulates epithelial cell apoptosis. Apoptosis 2008; 10:1305-15. [PMID: 16215678 PMCID: PMC1351359 DOI: 10.1007/s10495-005-2138-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Intestinal adaptation in short bowel syndrome (SBS) consists of increased epithelial cell (EC) proliferation as well as apoptosis. Previous microarray analyses of intraepithelial lymphocytes (IEL) gene expression after SBS showed an increased expression of angiotensin converting enzyme (ACE). Because ACE has been shown to promote alveolar EC apoptosis, we examined if IEL-derived ACE plays a role in intestinal EC apoptosis. METHODS Mice underwent either a 70% mid-intestinal resection (SBS group) or a transection (Sham group) and were studied at 7 days. ACE expression was measured, and ACE inhibition (ACE-I, enalaprilat) was used to assess ACE function. RESULTS IEL-derived ACE was significantly elevated in SBS mice. The addition of an ACE-I to SBS mice resulted in a significant decline in EC apoptosis. To address a possible mechanism, tumor necrosis factor alpha (TNF-alpha) mRNA expression was measured. TNF-alpha was significantly increased in SBS mice, and decreased with ACE-I. Interestingly, ACE-I was not able to decrease EC apoptosis in TNF-alpha knockout mice. CONCLUSIONS This study shows a previously undescribed expression of ACE by IEL. SBS was associated with an increase in IEL-derived ACE. ACE appears to be associated with an up-regulation of intestinal EC apoptosis. ACE-I significantly decreased EC apoptosis.
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Affiliation(s)
| | | | | | | | - Daniel H. Teitelbaum
- Correspondence to: Daniel H. Teitelbaum, MD, Section of Pediatric Surgery, University of Michigan Hospitals, Mott F3970, Box 0245, Ann Arbor, MI, 48109, USA, Phone: 734 764 4151, fax :734 936 9784 e-mail:
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Kossmehl P, Kurth E, Faramarzi S, Habighorst B, Shakibaei M, Wehland M, Kreutz R, Infanger M, J Danser AH, Grosse J, Paul M, Grimm D. Mechanisms of apoptosis after ischemia and reperfusion: role of the renin-angiotensin system. Apoptosis 2006; 11:347-58. [PMID: 16538381 DOI: 10.1007/s10495-006-4350-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Apoptosis plays a key role in the pathogenesis of cardiac diseases. We examined the influence of the renin-angiotensin system (RAS) on different regulators of apoptosis using an isolated hemoperfused working porcine heart model of acute ischemia (2 h), followed by reperfusion (4 h). METHODS AND RESULTS 23 porcine hearts were randomized to 5 groups: hemoperfused non-infarcted hearts (C), infarcted hearts (MI: R. circumflexus), infarcted hearts treated with quinaprilat (Q), infarcted hearts treated with angiotensin-I (Ang I), and infarcted hearts treated with angiotensin-I and quinaprilat (QA). Fas, Bax, bcl-2 and p53 proteins were increased in MI hearts and further elevated by Ang I. Quinaprilat reduced Bax and p53. Bcl-2 was elevated in Q and reduced in QA. An early upregulation of caspase-3 gene and protein expression was detected in MI and Ang I hearts compared to C. Q reduced caspase-3 gene expression, but had no effect on caspase-3 and Fas protein. CONCLUSIONS These data suggest that the RAS plays a pivotal role in cardiac apoptosis which is the early and predominant form of death in myocardial infarction. Ischemia/reperfusion induces programmed cell death via extrinsic and intrinsic pathways. Early treatment with quinaprilat attenuated cardiomyocyte apoptosis.
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Affiliation(s)
- P Kossmehl
- Institute of Clinical Pharmacology and Toxicology, Charité-University Medicine Berlin, Benjamin Franklin Campus, Berlin, Germany
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22
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Wysocki PJ, Kwiatkowska EP, Kazimierczak U, Suchorska W, Kowalczyk DW, Mackiewicz A. Captopril, an Angiotensin-Converting Enzyme Inhibitor, Promotes Growth of Immunogenic Tumors in Mice. Clin Cancer Res 2006; 12:4095-102. [PMID: 16818710 DOI: 10.1158/1078-0432.ccr-05-2489] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Antitumor potential of angiotensin-converting enzyme inhibitors has been shown in different preclinical settings, which always involved immunocompromised organisms or nonimmunogenic tumor models. In our study, we wanted to evaluate the effect of captopril on growth of immunogenic tumors in immunocompetent animals. EXPERIMENTAL DESIGN We used different murine tumor models to evaluate the effect of captopril on tumor take and survival of tumor-bearing immunocompetent and immunocompromised mice. We used an orthotopic renal cell cancer model and highly immunogenic tumor model, which were based on kidney subcapsular injection of RenCa cells or s.c. injection of MethA cells, respectively. To show the influence of captopril on antigen-specific immune responses, we have used two model antigens (green fluorescent protein and beta-galactosidase). RESULTS Captopril decreased survival of RenCa-bearing, immunocompetent mice in a dose-dependent manner and in adjuvant setting. In nephrectomized mice, captopril shortened their survival. Captopril promoted formation of immunogenic MethA sarcoma tumors but had no effect on nonimmunogenic melanoma cells (B78-H1). Treatment of immunocompromised mice bearing MethA tumors or RenCa kidney tumors with captopril did not affect tumor formation nor survival, respectively. Captopril-treated mice immunized with AdLacZ or AdGFP vectors did not generate or generated decreased numbers of antigen-specific CD8+ T cells, respectively. However, they showed B-cell responses represented by infiltration of MethA tumors with activated B cells and dramatically increased serum level of beta-galactosidase-specific antibodies. CONCLUSIONS Our results show a novel role of captopril in tumor biology and the tumor-promoting properties of captopril seem to be associated with its immunomodulatory potential.
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MESH Headings
- Angiotensin-Converting Enzyme Inhibitors/pharmacology
- Animals
- CD8-Positive T-Lymphocytes/drug effects
- CD8-Positive T-Lymphocytes/immunology
- Captopril/pharmacology
- Cell Line, Tumor
- Cell Survival/drug effects
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Drug Screening Assays, Antitumor
- Female
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, SCID
- Sarcoma, Experimental/immunology
- Sarcoma, Experimental/pathology
- Transplantation, Heterologous
- Xenograft Model Antitumor Assays
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Affiliation(s)
- Piotr J Wysocki
- Department of Cancer Immunology, University of Medical Sciences at GreatPoland Cancer Center, Poznan, Poland.
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23
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Xu J, Scholz A, Rösch N, Blume A, Unger T, Kreutz R, Culman J, Gohlke P. Low-dose lithium combined with captopril prevents stroke and improves survival in salt-loaded, stroke-prone spontaneously hypertensive rats. J Hypertens 2006; 23:2277-85. [PMID: 16269970 DOI: 10.1097/01.hjh.0000189868.48290.d8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVE A number of potential interactions between angiotensin-converting enzyme inhibitors and lithium have been described in the literature. In the present study, we investigated the effects of a low-dose combination treatment with lithium and captopril on survival and stroke prevention in salt-loaded, stroke-prone spontaneously hypertensive rats (SHRSP). METHODS Eight-week-old saline-drinking SHRSP (n = 21 per group) were treated with vehicle, LiCl (1 mmol/kg per day), captopril (25 mg/kg per day) and captopril plus LiCl for up to 37 weeks. Body weight, salt water intake blood pressure and mortality were recorded throughout the experimental period. Plasma renin activity, plasma lithium concentration and urinary excretion of albumin, sodium and potassium were measured at different time points. RESULTS Captopril treatment doubled the life expectancy when compared with vehicle-treated rats. Lithium alone had minor effects on survival but led to a dramatic increase in survival when added to captopril (mean survival time > 237 versus 147 days, P < 0.001). Systolic blood pressure increased with age in all treatment groups but was comparable in the captopril-treated and the captopril-plus-lithium-treated groups. Plasma renin activity as well as urinary sodium and potassium excretion did not differ between both groups. In the captopril group a striking fivefold increase of albuminuria occurred between 14 and 26 weeks of age, while this progression was completely abolished by the addition of lithium. CONCLUSIONS Our results demonstrate that the addition of lithium to captopril dramatically prolong the effects of the angiotensin-converting enzyme inhibitor on survival in salt-loaded SHRSP. This effect was independent of a reduction in blood pressure.
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Affiliation(s)
- Jihong Xu
- Institute of Pharmacology, University Hospital of Schleswig-Holstein, Campus Kiel, Germany
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24
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Abstract
A 59-year-old man with a 35-year personal and positive family history of psoriasis was admitted to our department for treatment of psoriatic erythroderma. The patient had commenced therapy with enalapril 10 mg b.i.d. for the treatment of hypertension approximately 6 weeks before hospitalization. Five weeks after the initiation of enalapril, his psoriasis began to flare, and for a period of about 1 week it reached the extent of erythroderma. The patient did not associate the psoriatic flare with other factors such as infections, trauma, or stress. The patient presented with diffuse erythema and pronounced desquamation covering his entire trunk, scalp, and extremities (Figure). Nearly 100% of the body surface area was involved. The palms and soles were also affected, displaying erythema, hyperkeratosis, and painful fissures. The nails showed pits, oil spots, and subungual hyperkeratosis. The patient also had psoriatic arthritis affecting the interphalangeal joints of his fingers. Laboratory tests revealed an elevated erythrocyte sedimentation rate, an elevated creatinine level of 180 mmol/L, a blood urea nitrogen level of 10.8 mmol/L, and a uric acid level of 716 mmol/L. Urinalysis showed proteinuria of 1.5 g/24 h. The patient's renal condition was diagnosed as chronic tubulointerstitial nephritis, most probably related to his dermatologic disease. Allopurinol and dietary measures were recommended. Following treatment with methotrexate and replacement of enalapril therapy, the erythema and scaling gradually subsided and became confined to his pre-eruptive chronic plaques (approximately 5% of body surface area). Rechallenge with enalapril was not performed.
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Affiliation(s)
- Dimitar Antonov
- Department of Dermatology and Venereology, Faculty of Medicine, Sofia Medical University, Sofia, Bulgaria.
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25
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Eiam-Ong S, Udom J, Sueblinvong T, Eiam-Ong S. Apoptosis of circulating lymphocyte in rats with unilateral ureteral obstruction: Role of angiotensin II. Nephrology (Carlton) 2005; 10:464-9. [PMID: 16221096 DOI: 10.1111/j.1440-1797.2005.00440.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
BACKGROUND Unilateral ureteral obstruction (UUO) could induce increased renal angiotensin II (ANG II), which enhances apoptosis of renal tubular cells and renal tissue loss. Systemic ANG II is also increased in UUO. There are no data available about whether UUO can induce apoptosis of circulating lymphocytes or not. METHODS UUO or sham-operated male Wistar rats (n = 8 in each group) were fed a drinking solution containing water, angiotensin II receptor type 1 antagonist (ARA; losartan, 500 mg/L) or angiotensin-converting enzyme inhibitor (ACEI; enalapril: 200 mg/L) for 1 day or 7 days. Blood samples were collected and circulating lymphocyte cells were separated. The apoptotic cells were detected by in situ terminal deoxynucleotidyl transferase (TdT assay)-mediated digoxigenin/antidigoxigenin conjugated fluorescein method and counted under a fluorescence microscope. The apoptotic index was calculated. RESULTS UUO caused marked increases in the apoptotic index of circulating lymphocytes in UUO rats at both 1 day and 7 days when compared with the respective sham groups (P < 0.001). Neither ARA nor ACEI treatment had an effect on the apoptotic index values in the UUO rats at 1 day. In the UUO rats at 7 days, the apoptosis of circulating lymphocytes was markedly decreased from 29.2 +/- 2.7% to 11.9 +/- 2.7% (P < 0.01) in the ARA-treated rats and to 7.6 +/- 2.7% (P < 0.001) in the ACEI-treated rats. CONCLUSION UUO, via stimulation of ANG II, could promptly enhance apoptosis of circulating lymphocytes. The apoptosis persisted throughout the 7 days of the study. Prolonged UUO would impair lymphocyte cell immunity and the host defense mechanism. Continuous treatment with either ARA or ACEI could abrogate ANG II-stimulated circulating lymphocyte apoptosis.
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Affiliation(s)
- Somchit Eiam-Ong
- Department of Physiology, Faculty of Medicine, Chulalongkorn University Hospital, Bangkok, Thailand
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Stenvinkel P, Ketteler M, Johnson RJ, Lindholm B, Pecoits-Filho R, Riella M, Heimbürger O, Cederholm T, Girndt M. IL-10, IL-6, and TNF-alpha: central factors in the altered cytokine network of uremia--the good, the bad, and the ugly. Kidney Int 2005; 67:1216-33. [PMID: 15780075 DOI: 10.1111/j.1523-1755.2005.00200.x] [Citation(s) in RCA: 609] [Impact Index Per Article: 32.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
It has been increasingly apparent that wasting and cardiovascular disease (CVD) is associated with a persistent systemic inflammatory response in end-stage renal disease (ESRD) patients. The reasons for the increased risk of inflammation in ESRD patients appear to be complex, including non-dialysis as well as dialysis-related factors. The combination of an impaired immune response coupled with persistent immune stimulation may have a role in the low-grade systemic inflammation and altered cytokine balance that characterizes the uremic state and which may translate into increased risk for vascular disease. The accelerated atherosclerotic process of ESRD may involve several interrelated processes, such as oxidative stress, endothelial dysfunction, and vascular calcification, in a milieu of constant low-grade inflammation with impaired function of neutrophils and T cells, as well as a dysregulated cytokine network. Although a large number of pro- and anti-inflammatory cytokines are of importance, available data suggest that the anti-inflammatory cytokine interleukin (IL)-10 and the mainly proinflammatory cytokines IL-6 and tumor necrosis factor-alpha (TNF-alpha) may play important roles in the development of Th imbalance, CVD and wasting in the uremic milieu. Given the strong association between proinflammatory cytokines and complications common in ESRD, such as vascular calcification and wasting, the potential role of both general and targeted anticytokine treatment strategies in ESRD patients needs further evaluation.
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Affiliation(s)
- Peter Stenvinkel
- Division of Renal Medicine and Baxter Novum, Department of Clinical Science, Karolinska Institutet, Karolinska University Hospital at Huddinge, Stockholm, Sweden.
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Daza L, Kornhauser C, Zamora L, Flores J. Captopril effect on prostaglandin E2, thromboxane B2 and proteinuria in lupus nephritis patients. Prostaglandins Other Lipid Mediat 2005; 78:194-201. [PMID: 16303616 DOI: 10.1016/j.prostaglandins.2005.08.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Revised: 08/11/2005] [Accepted: 08/12/2005] [Indexed: 11/17/2022]
Abstract
OBJECTIVE High urinary Prostaglandin E2 (PGE2) and thromboxane B2 (TxB2) levels have been reported in lupus nephritis (LN). Captopril diminishes proteinuria and improves glomerular filtration rate (GFR), and may have effect on immune function. We evaluate captopril effect on urinary PGE2, and TxB2. METHODS Eighteen LN patients were randomly assigned to two groups. Group 1 received only prednisone plus cyclophosphamide. Group 2 received also captopril. Serum creatinine, GFR, RPF, urinary proteins, PGE2 and TxB2, were assessed. RESULTS There were no differences between the initial and final assessments in Group 1. Group 2 showed a significant decrement in proteinuria (p=0.003) and serum creatinine (p=0.01) at the end of the study. PGE2 decreased significantly when compared with the initial value (p=0.02). CONCLUSION Captopril plus usual treatment, improved serum creatinine and decreased proteinuria in parallel with prostaglandin E2 reduction. This effect is not related to changes in GFR or RPF. Captopril may have an immunomodulatory effect on local inflammatory processes in lupus nephritis.
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Affiliation(s)
- L Daza
- Rheumatology and Clinical Research Unit, Hospital de Especialidades, IMSS, León Guanajuato, Mexico.
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von Haehling S, Diller GP, Anker SD. Impact of levosimendan treatment on chronic heart failure. Am J Cardiol 2004; 94:1105. [PMID: 15476643 DOI: 10.1016/j.amjcard.2004.05.078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2004] [Indexed: 10/26/2022]
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De Albuquerque DA, Saxena V, Adams DE, Boivin GP, Brunner HI, Witte DP, Singh RR. An ACE inhibitor reduces Th2 cytokines and TGF-beta1 and TGF-beta2 isoforms in murine lupus nephritis. Kidney Int 2004; 65:846-59. [PMID: 14871404 PMCID: PMC2291513 DOI: 10.1111/j.1523-1755.2004.00462.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Angiotensin-converting enzyme (ACE) inhibitors, such as captopril, are used to control hypertension. In patients and animals with primary nephropathies, these agents improve renal function more than that would be expected from their control of hypertension. Here, we examine the effects of treatment with captopril on lupus nephritis and discuss the potential mechanism(s) by which this agent exerts its renoprotective effects. METHODS Lupus-prone, NZB/NZW F1 and MRL-lpr/lpr, mice were treated with captopril or with a control antihypertensive agent, verapamil. Mice were monitored for nephritis, and their sera and tissues analyzed for cytokine and transforming growth factor-beta (TGF-beta) expression. RESULTS Captopril treatment delayed the onset of proteinuria when administered to prenephritic mice, whereas verapamil did not. Captopril treatment also retarded disease progression when given to lupus mice that had early disease, and even reversed severe proteinuria in at least some older animals with advanced disease. It reduced chronic renal lesions, but had no effect on autoantibody production. The improvement in renal disease correlated with reduced TGF-beta expression, particularly of the TGF-beta1 and TGF-beta2 isoforms, in the kidneys. Interestingly, in vivo or in vitro exposure to captopril reduced splenic levels of type 2 cytokines, interleukin (IL)-4 and IL-10, suggesting a possible role of the immune system in captopril-mediated disease modulation. CONCLUSION Since type 2 cytokines are known to promote lupus glomerulosclerosis, decreased IL-4 and IL-10 production in captopril-treated mice may be related to this agent's renoprotective effects. We argue here that ACE inhibitors not only act as selective TGF-beta inhibitors, but also as selective immunomodulators, to improve lupus nephritis.
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Affiliation(s)
- Deijanira Alves De Albuquerque
- Department of Internal Medicine, University of Cincinnati College of Medicine, Veterans Administration Medical Center and Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45267-0563, USA
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Wildhaber BE, Yang H, Coran AG, Teitelbaum DH. Gene alteration of intestinal intraepithelial lymphocytes in response to massive small bowel resection. Pediatr Surg Int 2003; 19:310-5. [PMID: 12728327 DOI: 10.1007/s00383-003-1001-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/10/2002] [Indexed: 10/26/2022]
Abstract
BACKGROUND The intestinal adaptive response [increased epithelial cell (EC) proliferation and apoptosis] after massive small bowel resection (SBR) is partially controlled by intraepithelial lymphocytes (IEL). To identify IEL factors contributing to EC adaptation post-SBR we utilized microarray assays. METHODS Mice underwent a 70% SBR (SBR1w/SBR4w) or sham operation (Sham1w/Sham4w). After 1 or 4 weeks (1w, 4w) small bowel was harvested, and IEL isolated. Determination of the EC-proliferation rate used BrdU incorporation, and of the EC-apoptotic rate used Annexin V staining. Affymetrix system microarrays (12,491 genes) were performed to examine IEL-mRNA expression. Results were considered significant if fold-change (FC) between groups was >2 and P<0.05 (F-test), or FC>3 and 0.05> P >0.01, or FC>4 and P>0.05. Significant genes were confirmed by conventional RT-PCR. RESULTS The SBR EC-proliferation rate increased significantly in both 1w and 4w groups compared to Sham: SBR1w 0.24+/-0.07 vs. Sham1w 0.12+/-0.02 (P=0.03); SBR4w 0.35+/-0.04 vs. Sham4w 0.19+/-0.02 ( P<0.01). The EC-apoptotic rate was unchanged in the 1w group, but significantly differed from controls after 4 weeks: SBR4w 39.92+/-6.78 vs. Sham4w 12.56+/-6.44 ( P<0.01). Microarray results were analyzed to identify potential growth-modifying IEL genes. The following were identified (function in parenthesis; A, apoptosis; P, proliferation): lipocalin 2 (promotes A), angiotensin converting enzyme (increases A), Rap2 interacting protein (reduces A, promotes P), amphiregulin (promotes P) and leucine-rich-alpha2-glycoprotein (promotes A, reduces P). Based on RT-PCR results these genes showed significant changes between groups. The increase in ACE at 1w preceded the observed apoptotic changes. The alterations in lipocalin 2, Rap2 and amphiregulin at 4w coincided with the marked changes in growth and apoptosis in the SBR mice. CONCLUSIONS IEL undergo temporal changes after SBR. These findings provide profound insight into potential IEL-dependent regulation of EC homeostasis post-SBR.
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Affiliation(s)
- Barbara E Wildhaber
- Department of Surgery, Section of Pediatric Surgery, C.S. Mott Children's Hospital, University of Michigan Medical School, Mott F3970, Box 0245, Ann Arbor, MI 48109, USA
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Bhaskaran M, Reddy K, Radhakrishanan N, Franki N, Ding G, Singhal PC. Angiotensin II induces apoptosis in renal proximal tubular cells. Am J Physiol Renal Physiol 2003; 284:F955-65. [PMID: 12527553 DOI: 10.1152/ajprenal.00246.2002] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
ANG II has been demonstrated to play a role in the progression of tubulointerstial injury. We studied the direct effect of ANG II on apoptosis of cultured rat renal proximal tubular epithelial cells (RPTECs). ANG II promoted RPTEC apoptosis in a dose- and time-dependent manner. This effect of ANG II was attenuated by anti-transforming growth factor (TGF)-beta antibody. Moreover, TGF-beta triggered RPTEC apoptosis in a dose-dependent manner. ANG II also enhanced RPTEC expression of Fas and Fas ligand (FasL); furthermore, anti-FasL antibody attenuated ANG II-induced RPTEC apoptosis. In addition, ANG II increased RPTEC expression of Bax, a cell death protein. Both ANG II type 1 (AT(1)) and type 2 (AT(2)) receptor blockers inhibited ANG II-induced RPTEC apoptosis. SB-202190, an inhibitor of p38 MAPK phosphorylation, and caspase-3 inhibitor also attenuated ANG II-induced RPTEC apoptosis. ANG II enhanced RPTEC heme oxygenase (HO)-1 expression. Interestingly, pretreatment with hemin as well as curcumin (inducers of HO-1) inhibited the ANG II-induced tubular cell apoptosis; conversely, pretreatment with zinc protoporphyrin, an inhibitor of HO-1 expression, promoted the effect of ANG II. These results suggest that ANG II-induced apoptosis is mediated via both AT(1) and AT(2) receptors through the generation of TGF-beta, followed by the transcription of cell death genes such as Fas, FasL, and Bax. Modulation of tubular cell expression of HO-1 has an inverse relationship with the ANG II-induced tubular cell apoptosis.
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Affiliation(s)
- Madhu Bhaskaran
- Department of Medicine, Long Island Jewish Medical Center, The Long Island Campus for the Albert Einstein College of Medicine, New Hyde Park, New York 11040, USA
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Vauquelin G, Michotte Y, Smolders I, Sarre S, Ebinger G, Dupont A, Vanderheyden P. Cellular targets for angiotensin II fragments: pharmacological and molecular evidence. J Renin Angiotensin Aldosterone Syst 2002; 3:195-204. [PMID: 12584663 DOI: 10.3317/jraas.2002.041] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Although angiotensin II has long been considered to represent the end product of the renin-angiotensin system (RAS), there is accumulating evidence that it encompasses additional effector peptides with diverse functions. In this respect, angiotensin IV (Ang IV) formed by deletion of the two N terminal amino acids, has sparked great interest because of its wide range of physiological effects. Among those, its facilitatory role in memory acquisition and retrieval is of special therapeutic relevance. High affinity binding sites for this peptide have been denoted as AT(4)- receptors and, very recently, they have been proposed to correspond to the membrane-associated OTase/ IRAP aminopeptidase. This offers new opportunities for examining physiological roles of Ang IV in the fields of cognition, cardiovascular and renal metabolism and pathophysiological conditions like diabetes and hypertension. Still new recognition sites may be unveiled for this and other angiotensin fragments. Recognition sites for Ang-(1-7) (deletion of the C terminal amino acid) are still elusive and some of the actions of angiotensin III (deletion of the N terminal amino acid) in the CNS are hard to explain on the basis of their interaction with AT(1)-receptors only. A more thorough cross-talk between in vitro investigations on native and transfected cell lines and in vivo investigations on healthy, diseased and transgenic animals may prove to be essential to further unravel the molecular basis of the physiological actions of these small endogenous angiotensin fragments.
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Affiliation(s)
- Georges Vauquelin
- Department of Molecular and Biochemical Pharmacology, Vrije Universiteit Brussel (VUB), Sint-Genesius, Rode, B-1640, Belgium
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Ruiz-Ortega M, Lorenzo O, Suzuki Y, Rupérez M, Egido J. Proinflammatory actions of angiotensins. Curr Opin Nephrol Hypertens 2001; 10:321-9. [PMID: 11342793 DOI: 10.1097/00041552-200105000-00005] [Citation(s) in RCA: 297] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Many experimental data have suggested that the renin-angiotensin system participates in immune and inflammatory responses. Angiotensin II is involved in several steps of the inflammatory process: mononuclear cells respond to angiotensin II stimulation (cell proliferation and chemotaxis); angiotensin II regulates the recruitment of proinflammatory cells into the site of injury (mediated by the expression of vascular permeability factors, adhesion molecules and chemokines by resident cells); inflammatory cells can produce angiotensin II, and might therefore contribute to the perpetuation of tissue damage. In this review, we summarize the proinflammatory properties of angiotensin II, to demonstrate the novel role of this vasoactive peptide as a true cytokine. We will show the information obtained as a result of the pharmacological blockade of the renin angiotensin system, which has demonstrated that this system is involved in immune and inflammatory diseases. In this aspect, we discuss the molecular mechanism of angiotensin II-induced tissue damage, as well as its contribution to the pathogenesis of several diseases, including atherosclerosis, hypertension and renal damage, showing that angiotensin II plays an active role in the inflammatory response of these diseases.
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Affiliation(s)
- M Ruiz-Ortega
- Laboratory of Vascular and Renal Pathology, Fundación Jiménez Díaz, Universidad Autónoma, Madrid, Spain
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