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Bernstein KE, Cao D, Shibata T, Saito S, Bernstein EA, Nishi E, Yamashita M, Tourtellotte WG, Zhao TV, Khan Z. Classical and nonclassical effects of angiotensin-converting enzyme: How increased ACE enhances myeloid immune function. J Biol Chem 2024; 300:107388. [PMID: 38763333 PMCID: PMC11208953 DOI: 10.1016/j.jbc.2024.107388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 05/01/2024] [Accepted: 05/07/2024] [Indexed: 05/21/2024] Open
Abstract
As part of the classical renin-angiotensin system, the peptidase angiotensin-converting enzyme (ACE) makes angiotensin II which has myriad effects on systemic cardiovascular function, inflammation, and cellular proliferation. Less well known is that macrophages and neutrophils make ACE in response to immune activation which has marked effects on myeloid cell function independent of angiotensin II. Here, we discuss both classical (angiotensin) and nonclassical functions of ACE and highlight mice called ACE 10/10 in which genetic manipulation increases ACE expression by macrophages and makes these mice much more resistant to models of tumors, infection, atherosclerosis, and Alzheimer's disease. In another model called NeuACE mice, neutrophils make increased ACE and these mice are much more resistant to infection. In contrast, ACE inhibitors reduce neutrophil killing of bacteria in mice and humans. Increased expression of ACE induces a marked increase in macrophage oxidative metabolism, particularly mitochondrial oxidation of lipids, secondary to increased peroxisome proliferator-activated receptor α expression, and results in increased myeloid cell ATP. ACE present in sperm has a similar metabolic effect, and the lack of ACE activity in these cells reduces both sperm motility and fertilization capacity. These nonclassical effects of ACE are not due to the actions of angiotensin II but to an unknown molecule, probably a peptide, that triggers a profound change in myeloid cell metabolism and function. Purifying and characterizing this peptide could offer a new treatment for several diseases and prove potentially lucrative.
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Affiliation(s)
- Kenneth E Bernstein
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA; Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA.
| | - DuoYao Cao
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Tomohiro Shibata
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Suguru Saito
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Ellen A Bernstein
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Erika Nishi
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA; Department of Physiology, São Paulo School of Medicine, Universidade Federal de São Paulo, Sao Paulo, Brazil
| | - Michifumi Yamashita
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Warren G Tourtellotte
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA; Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Tuantuan V Zhao
- Research Oncology, Gilead Sciences, Foster City, California, USA
| | - Zakir Khan
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA; Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California, USA; Institute for Myeloma & Bone Cancer Research, West Hollywood, California, USA
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2
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Adanas R, Turkoglu V. Exploration of inhibitor effect of Gly-Pro (GP), Arg-Gly-Asp-Ser (RGDS) and Ser-Asp-Gly-Arg-Gly (SDGRG) bioactive peptides on angiotensin-converting enzyme activity purified from human serum. J Biomol Struct Dyn 2024:1-9. [PMID: 38247271 DOI: 10.1080/07391102.2024.2306195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 01/09/2024] [Indexed: 01/23/2024]
Abstract
Bioactive peptides (BPs) are a natural and important alternative to synthetic angiotensin-converting enzyme (ACE) inhibitors used in the treatment of hypertension. In this study, ACE was 3575-fold purified from human serum with the affinity chromatography process in one step. The molecular weight and purity of ACE were identified using the SDS-PAGE process and seen in two bands at around 60 kDa and 70 kDa on the gel. Vmax and KM values from the Lineweaver-Burk graphic were determined as 96.15 (µmol/min) mL-1 and 0.2 mM, respectively. The effects of Gly-Pro (GP), Arg-Gly-Asp-Ser (RGDS) and Ser-Asp-Gly-Arg-Gly (SDGRG) BPs on purified ACE were researched. Also, lisinopril was used as a reference inhibitor. GP, RGDS and SDGRG on purified ACE demonstrated an inhibitory effect. IC50 values for these peptides were found as 184.71, 107.16 and 32.54 µM, respectively. Ki values and type of inhibitory for GP, RGDS and SDGRG by the Lineweaver-Burk chart were found. The type of inhibitory for these peptides was calculated as reversible-competitive inhibitory. Ki values for GP, RGDS and SDGRG were calculated to be 260.02, 63.44 and 11.42 µM, respectively. Also, the SDGRG indicated a higher inhibition effect on ACE activity than the GP and RGDS. The IC50 value of lisinopril was designated as 0.35 nM. The inhibition type of lisinopril was designated as reversible noncompetitive inhibition from the Lineweaver-Burk chart and the Ki value was 0.15 nM. Herein, it was concluded that GP, RGDS and SDGRG have ACE inhibitor potential.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Resul Adanas
- Science Faculty, Chemistry Department, Van Yüzüncü Yıl University, Van, Turkey
| | - Vedat Turkoglu
- Science Faculty, Chemistry Department, Van Yüzüncü Yıl University, Van, Turkey
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3
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Peptide inhibitors of angiotensin-I converting enzyme based on angiotensin (1–7) with selectivity for the C-terminal domain. Bioorg Chem 2022; 129:106204. [DOI: 10.1016/j.bioorg.2022.106204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/05/2022] [Accepted: 10/07/2022] [Indexed: 11/18/2022]
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4
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Bas Z. Inhibition effect of nicotinamide (vitamin B 3) and reduced glutathione (GSH) peptide on angiotensin-converting enzyme activity purified from sheep kidney. Int J Biol Macromol 2021; 189:65-71. [PMID: 34419538 DOI: 10.1016/j.ijbiomac.2021.08.109] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 08/13/2021] [Accepted: 08/14/2021] [Indexed: 12/11/2022]
Abstract
Angiotensin-converting enzyme (ACE, EC 3.4.15.1) plays a significant role in blood pressure regulation and inhibition of this enzyme is one of the significant drug targets for the treatment of hypertension. In this work, ACE was purified from sheep kidneys with the affinity chromatography method in one step. The purity and molecular weight of ACE were designated using the SDS-PAGE method and observed two bands at around 60 kDa and 70 kDa on the gel. The effects of nicotinamide (vitamin B3) and reduced glutathione (GSH) peptide on purified ACE were researched. Nicotinamide and GSH peptide on purified ACE showed an inhibition effect. IC50 values for nicotinamide and GSH were calculated as 14.3 μM and 7.3 μM, respectively. Type of inhibition and Ki values for nicotinamide and GSH from the Lineweaver-Burk graph were determined. The type of inhibition for nicotinamide and GSH was determined as non-competitive inhibition. Ki value was calculated as 15.4 μM for nicotinamide and 6.7 μM for GSH. Also, GSH peptide showed higher inhibitory activity on ACE activity than nicotinamide. In this study, it was concluded that nicotinamide and GSH peptide compounds, which show an inhibition effect on ACE activity, may have both protective and therapeutic effects against hypertension.
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Affiliation(s)
- Zehra Bas
- Van Yüzüncü Yıl University, Faculty of Health Sciences, Department of Nutrition and Dietetics, Van, Turkey.
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5
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Aydin F, Turkoglu V, Bas Z. Purification and characterization of angiotensin-converting enzyme (ACE) from sheep lung. Mol Biol Rep 2021; 48:4191-4199. [PMID: 34086160 PMCID: PMC8176444 DOI: 10.1007/s11033-021-06432-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/21/2021] [Indexed: 01/11/2023]
Abstract
Angiotensin-converting enzyme (ACE, EC 3.4.15.1) in the renin-angiotensin system regulates blood pressure by catalyzing angiotensin I to the vasoconstrictor angiotensin II. In this study, the ACE was purified and characterized from sheep lung. The kinetic properties of the ACE were designated. The inhibition effect of captopril, a specific ACE inhibitor, was determined. ACE was purified from sheep lung using the affinity chromatography method in one step. NHS-activated Sepharose 4 Fast Flow as column filler and lisinopril as a ligand in this method used. The molecular weight and purity of ACE were designated using the SDS-PAGE method. Optimum temperature and optimum pH were found for purified ACE. KM and Vmax values from Lineweaver–Burk charts determined. The inhibition type, IC50, and Ki values of captopril on purified ACE were identified. ACE was 6405-fold purified from sheep lung by affinity chromatography in one step and specific activity was 16871 EU/mg protein. The purity and molecular weight of ACE were found with SDS-PAGE and observed two bands at around 60 kDa and 70 kDa on the gel. Optimum temperature and optimum pH were designated for purified ACE. Optimum temperature and pH were found as 40 °C and pH 7.4, respectively. Vmax and KM values were calculated to be 35.59 (µmol/min).mL−1 and 0.18 mM, respectively. IC50 value of captopril was found as 0.51 nM. The inhibition type of captopril was determined as non-competitive from the Lineweaver–Burk graph and the Ki value was 0.39 nM. As a result, it was observed in this study that the ACE enzyme can be successfully purified from sheep lungs in one step. Also, it was determined that captopril, which is a specific ACE inhibitor, has a significant inhibitory effect with a very low IC50 value of 0.51 nM.
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Affiliation(s)
- Fatih Aydin
- Department of Chemistry, Faculty of Science, Van YüzüncüYıl University, Van, Turkey
| | - Vedat Turkoglu
- Department of Chemistry, Faculty of Science, Van YüzüncüYıl University, Van, Turkey
| | - Zehra Bas
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Van Yüzüncü Yıl University, 65080, Van, Turkey.
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Mondal R, Lahiri D, Deb S, Bandyopadhyay D, Shome G, Sarkar S, Paria SR, Thakurta TG, Singla P, Biswas SC. COVID-19: Are we dealing with a multisystem vasculopathy in disguise of a viral infection? J Thromb Thrombolysis 2020; 50:567-579. [PMID: 32627126 PMCID: PMC7335630 DOI: 10.1007/s11239-020-02210-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
After the emergence of Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) and Middle East Respiratory Syndrome Coronavirus (MERS-CoV) in the last two decades, the world is facing its new challenge in Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) pandemic with unprecedented global response. With the expanding domain of presentations in COVID-19 patients, the full range of manifestations is yet to unfold. The classical clinical symptoms for SARS-CoV-2 affected patients are dry cough, high fever, dyspnoea, lethal pneumonia whereas many patients have also been found to be associated with a few additional signs and clinical manifestations of isolated vasculopathy. Albeit a deep and profound knowledge has been gained on the clinical features and management of COVID-19, less clear association has been provided on SARS-CoV-2 mediated direct or indirect vasculopathy and its possible correlation with disease prognosis. The accumulative evidences suggest that novel coronavirus, apart from its primary respiratory confinement, may also invade vascular endothelial cells of several systems including cerebral, cardio-pulmonary as well as renal microvasculature, modulating multiple visceral perfusion indices. Here we analyse the phylogenetic perspective of SARS-CoV-2 along with other strains of β-coronaviridae from a standpoint of vasculopathic derangements. Based on the existing case reports, literature and open data bases, we also analyse the differential pattern of vasculopathy related changes in COVID-19 positive patients. Besides, we debate the need of modulation in clinical approach from a hemodynamical point of view, as a measure towards reducing disease transmission, morbidity and mortality in SARS-CoV-2 affected patients.
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Affiliation(s)
- Ritwick Mondal
- Institute of Post Graduate Medical Education and Research, SSKM Hospital, 52/1A, S.N. Pandit Street, Kolkata, 700025, India
| | - Durjoy Lahiri
- Institute of Post Graduate Medical Education and Research, SSKM Hospital, 52/1A, S.N. Pandit Street, Kolkata, 700025, India.
| | - Shramana Deb
- S.N. Pradhan Centre for Neuroscience, University of Calcutta, Kolkata, India
| | - Deebya Bandyopadhyay
- Institute of Post Graduate Medical Education and Research, SSKM Hospital, 52/1A, S.N. Pandit Street, Kolkata, 700025, India
| | - Gourav Shome
- Department of Microbiology, University of Calcutta, Kolkata, India
| | - Sukanya Sarkar
- CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Sudeb R Paria
- Institute of Post Graduate Medical Education and Research, SSKM Hospital, 52/1A, S.N. Pandit Street, Kolkata, 700025, India
| | | | - Pratibha Singla
- Gian Sagar Medical College and Hospital, Patiala, Punjab, India
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Aitken RJ. COVID-19 and human spermatozoa-Potential risks for infertility and sexual transmission? Andrology 2020; 9:48-52. [PMID: 32649023 PMCID: PMC7404878 DOI: 10.1111/andr.12859] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/29/2020] [Accepted: 07/01/2020] [Indexed: 12/21/2022]
Abstract
As COVID‐19 infections wreak havoc across the globe, attention has rightly been focused on the vital organ systems (lung, kidney and heart) that are vulnerable to viral attack and contribute to the acute pathology associated with this disease. However, we should not lose sight of the fact that COVID‐19 will attack any cell type in the body expressing ACE2 ‐ including human spermatozoa. These cells possess the entire repertoire of receptors (AT1R, AT2R, MAS) and ligand processing enzymes (ACE1 and ACE2) needed to support the angiotensin signalling cascade. The latter not only provides COVID‐19 with a foothold on the sperm surface but may also promote integration, given the additional presence of a range of proteases (TMPRSS2, TMPRSS11B, TMPRSS12, furin) capable of promoting viral fusion. This article reviews the roles played by these various cellular constituents in maintaining the vitality of human spermatozoa and their competence for fertilization. The reproductive consequences of a viral attack on these systems, in terms of fertility and the risk of sexual transmission, are currently unknown. However, we should be alive to the possibility that there may be reproductive consequences of COVID‐19 infection in young males that go beyond their capacity to survive a viral attack.
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Affiliation(s)
- Robert John Aitken
- Priority Research Centre for Reproductive Science, Faculty of Science and Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia
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8
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Gianzo M, Urizar-Arenaza I, Muñoa-Hoyos I, Larreategui Z, Garrido N, Casis L, Irazusta J, Subirán N. Human sperm testicular angiotensin-converting enzyme helps determine human embryo quality. Asian J Androl 2019; 20:498-504. [PMID: 29873314 PMCID: PMC6116683 DOI: 10.4103/aja.aja_25_18] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Angiotensin-converting enzyme functions in the male reproductive system, but the extent of its function in reproduction is not fully understood. The primary objective of this work was to investigate the relationship between the testicular isoform of angiotensin-converting enzyme present in human spermatozoa and semen parameters, human embryo quality, and assisted reproduction success. A total of 81 semen samples and 635 embryos from couples undergoing oocyte donation cycles at the IVI Bilbao Clinic were analyzed. Semen parameters, embryos quality, and blastocyst development were examined according to the World Health Organization standards and the Spanish Association of Reproduction Biology Studies criteria. The percentage of testicular angiotensin-converting enzyme-positive spermatozoa and the number of molecules per spermatozoon were analyzed by flow cytometry. Both parameters were inversely correlated with human sperm motility. Higher percentages of testicular angiotensin-converting enzyme-positive spermatozoa together with fewer enzyme molecules per spermatozoon were positively correlated with better embryo quality and development. Our results suggest that embryos with a higher implantation potential come from semen samples with higher percentages of testicular angiotensin-converting enzyme-positive cells and fewer enzyme molecules per spermatozoon. Based on these findings, we propose that testicular angiotensin-converting enzyme could be used to aid embryologists in selecting better semen samples for obtaining high-quality blastocysts during in vitro fertilization procedures.
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Affiliation(s)
- Marta Gianzo
- Department of Physiology, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Leioa, Biscay 48940, Spain
| | - Itziar Urizar-Arenaza
- Department of Physiology, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Leioa, Biscay 48940, Spain
| | - Iraia Muñoa-Hoyos
- Department of Physiology, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Leioa, Biscay 48940, Spain
| | - Zaloa Larreategui
- In Vitro Fertilization Laboratory, IVI Bilbao, Landabarri Promenade 1, Leioa, Biscay 48940, Spain
| | - Nicolás Garrido
- IVI Foundation, IVI Valencia, Local Police Square 3, Valencia 46015, Spain
| | - Luis Casis
- Department of Physiology, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Leioa, Biscay 48940, Spain
| | - Jon Irazusta
- Department of Physiology, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Leioa, Biscay 48940, Spain
| | - Nerea Subirán
- Department of Physiology, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Leioa, Biscay 48940, Spain
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9
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Alhenc-Gelas F, Bouby N, Girolami JP. Kallikrein/K1, Kinins, and ACE/Kininase II in Homeostasis and in Disease Insight From Human and Experimental Genetic Studies, Therapeutic Implication. Front Med (Lausanne) 2019; 6:136. [PMID: 31316987 PMCID: PMC6610447 DOI: 10.3389/fmed.2019.00136] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 05/31/2019] [Indexed: 01/19/2023] Open
Abstract
Kallikrein-K1 is the main kinin-forming enzyme in organs in resting condition and in several pathological situations whereas angiotensin I-converting enzyme/kininase II (ACE) is the main kinin-inactivating enzyme in the circulation. Both ACE and K1 activity levels are genetic traits in man. Recent research based mainly on human genetic studies and study of genetically modified mice has documented the physiological role of K1 in the circulation, and also refined understanding of the role of ACE. Kallikrein-K1 is synthesized in arteries and involved in flow-induced vasodilatation. Endothelial ACE synthesis displays strong vessel and organ specificity modulating bioavailability of angiotensins and kinins locally. In pathological situations resulting from hemodynamic, ischemic, or metabolic insult to the cardiovascular system and the kidney K1 and kinins exert critical end-organ protective action and K1 deficiency results in severe worsening of the conditions, at least in the mouse. On the opposite, genetically high ACE level is associated with increased risk of developing ischemic and diabetic cardiac or renal diseases and worsened prognosis of these diseases. The association has been well-documented clinically while causality was established by ACE gene titration in mice. Studies suggest that reduced bioavailability of kinins is prominently involved in the detrimental effect of K1 deficiency or high ACE activity in diseases. Kinins are involved in the therapeutic effect of both ACE inhibitors and angiotensin II AT1 receptor blockers. Based on these findings, a new therapeutic hypothesis focused on selective pharmacological activation of kinin receptors has been launched. Proof of concept was obtained by using prototypic agonists in experimental ischemic and diabetic diseases in mice.
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Affiliation(s)
- Francois Alhenc-Gelas
- INSERM U1138-CRC, Paris, France.,CRC-INSERM U1138, Paris-Descartes University, Paris, France.,CRC-INSERM U1138, Sorbonne University, Paris, France
| | - Nadine Bouby
- INSERM U1138-CRC, Paris, France.,CRC-INSERM U1138, Paris-Descartes University, Paris, France.,CRC-INSERM U1138, Sorbonne University, Paris, France
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10
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Nagaoka S, Kawasaki S, Kawasaki H, Kamei K. The angiotensin converting enzyme (ACE) inhibitor, captopril disrupts the motility activation of sperm from the silkworm, Bombyx mori. JOURNAL OF INSECT PHYSIOLOGY 2017; 103:18-28. [PMID: 28964767 DOI: 10.1016/j.jinsphys.2017.09.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 09/12/2017] [Accepted: 09/14/2017] [Indexed: 06/07/2023]
Abstract
Angiotensin I-converting enzyme (also known as peptidyl dicarboxypeptidase A, ACE, and EC 3.4.15.1), which is found in a wide range of organisms, cleaves C-terminal dipeptides from relatively short oligopeptides. Mammalian ACE plays an important role in the regulation of blood pressure. However, the precise physiological functions of insect ACE homologs have not been understood. As part of our effort to elucidate new physiological roles of insect ACE, we herein report a soluble ACE protein in male reproductive secretions from the silkmoth, Bombyx mori. Seminal vesicle sperm are quiescent in vitro, but vigorous motility is activated by treatment with either a glandula (g.) prostatica homogenate or trypsin in vitro. When seminal vesicle sperm were pre-incubated with captopril, a strong and specific inhibitor of mammalian ACE, and then stimulated to initiate motility by the addition of the g. prostatica homogenate or trypsin, the overall level of acquired motility was reduced in an inhibitor-concentration-dependent manner. In the course of this project, we detected ACE-related carboxypeptidase activity that was inhibited by captopril in both the vesicular (v.) seminalis of the noncopulative male reproductive tract and in the spermatophore that forms in the female bursa copulatrix at the time of mating, just as in an earlier report on the tomato moth, Lacanobia oleracea, which belongs to a different lepidopteran species (Ekbote et al., 2003a). Two distinct genes encoding ACE-like proteins were identified by analysis of B. mori cDNA, and were named BmAcer and BmAcer2, respectively [the former was previously reported by Quan et al. (2001) and the latter was first isolated in this paper]. RT-qPCR and Western blot analyses indicated that the BmAcer2 was predominantly produced in v. seminalis and transferred to the spermatophore during copulation, while the BmAcer was not detected in the adult male reproductive organs. A recombinant protein of BmAcer2 (devoid of a signal peptide) that was expressed in Escherichia coli cells exhibited captopril-sensitive carboxypeptidase activities. Our findings show that the BmAcre2 gene encodes a secreted ACE protein included in the Bombyx seminal plasma. In particular, the silkworm ACE protein in the seminal fluid might be involved in the signaling pathway that leads to the activation and regulation of sperm motility.
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Affiliation(s)
- Sumiharu Nagaoka
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan; The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
| | - Saori Kawasaki
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Hideki Kawasaki
- Faculty of Agriculture, Utsunomiya University, 350 Mine, Tochigi 321-8505, Japan
| | - Kaeko Kamei
- Department of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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11
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Serine proteases as candidates for proteolytic processing of angiotensin-I converting enzyme. Int J Biol Macromol 2014; 72:673-9. [PMID: 25263467 DOI: 10.1016/j.ijbiomac.2014.09.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 09/04/2014] [Accepted: 09/05/2014] [Indexed: 11/21/2022]
Abstract
Somatic angiotensin-I converting enzyme (sACE) is a broadly distributed peptidase which plays a role in blood pressure and electrolyte homeostasis by the conversion of angiotensin I into angiotensin II. N-domain isoforms (nACE) with 65 and 90 kDa have been described in body fluids, tissues and mesangial cells (MC), and a 90 kDa nACE has been described only in spontaneously hypertensive rats. The aim of this study was to investigate the existence of proteolytic enzymes that may act in the hydrolysis of sACE generating nACEs in MC. After the confirmation of the presence of ACE sheddases in Immortalized MC (IMC), we purified and characterized these enzymes using fluorogenic substrates specifically designed for ACE sheddases. Purified enzyme identified as a serine protease by N-terminal sequence was able to generate nACE. In the present study, we described for the first time the presence of ACE sheddases in IMC, identified as serine proteases able to hydrolyze sACE in vitro. Further investigations are necessary to elucidate the mechanisms responsible for the expression and regulation of ACE sheddases in MC and their roles in the generation of nACEs, especially the 90 kDa form possibly related to hypertension.
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12
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Li LJ, Zhang FB, Liu SY, Tian YH, Le F, Wang LY, Lou HY, Xu XR, Huang HF, Jin F. Human sperm devoid of germinal angiotensin-converting enzyme is responsible for total fertilization failure and lower fertilization rates by conventional in vitro fertilization. Biol Reprod 2014; 90:125. [PMID: 24790158 DOI: 10.1095/biolreprod.113.114827] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In conventional in vitro fertilization (IVF), complete failure of fertilization occurs in 5% to 15% of treatments. Although the causes may be unclear, sperm defects appear to be the major contributor. However, a convincing test is not yet available that can predict the risk of fertilization failure. In this study, we found that germinal angiotensin-converting enzyme (gACE) (also called testicular ACE) was undetectable in sperm from patients who had total fertilization failure (TFF) and lower fertilization rates (LFRs) by IVF based on Western blot and indirect immunofluorescence analyses. Additionally, almost all of the patients without gACE on sperm (23 of 25) manifested a TT genotype of the rs4316 single-nucleotide polymorphism of ACE. Overall, our results indicate that the absence of gACE expression is responsible for TFF and LFRs by IVF. The rs4316 polymorphism of ACE might be associated with infertility in those patients. We conclude that sperm lacking gACE may be recognized before commencing IVF and that the patients may be directed instead to consider intracytoplasmic sperm injection.
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Affiliation(s)
- Le-Jun Li
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Feng-Bin Zhang
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Shu-Yuan Liu
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Yong-Hong Tian
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Fang Le
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Li-Ya Wang
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Hang-Ying Lou
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Xiang-Rong Xu
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - He-Feng Huang
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Fan Jin
- Department of Reproductive Endocrinology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China Key Laboratory of Reproductive Genetics, National Ministry of Education (Zhejiang University), Women's Reproductive Health Laboratory of Zhejiang Province, Hangzhou, Zhejiang, China
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13
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Girolami JP, Blaes N, Bouby N, Alhenc-Gelas F. Genetic manipulation and genetic variation of the kallikrein-kinin system: impact on cardiovascular and renal diseases. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 2014; 69:145-196. [PMID: 25130042 DOI: 10.1007/978-3-319-06683-7_6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Genetic manipulation of the kallikrein-kinin system (KKS) in mice, with either gain or loss of function, and study of human genetic variability in KKS components which has been well documented at the phenotypic and genomic level, have allowed recognizing the physiological role of KKS in health and in disease. This role has been especially documented in the cardiovascular system and the kidney. Kinins are produced at slow rate in most organs in resting condition and/or inactivated quickly. Yet the KKS is involved in arterial function and in renal tubular function. In several pathological situations, kinin production increases, kinin receptor synthesis is upregulated, and kinins play an important role, whether beneficial or detrimental, in disease outcome. In the setting of ischemic, diabetic or hemodynamic aggression, kinin release by tissue kallikrein protects against organ damage, through B2 and/or B1 bradykinin receptor activation, depending on organ and disease. This has been well documented for the ischemic or diabetic heart, kidney and skeletal muscle, where KKS activity reduces oxidative stress, limits necrosis or fibrosis and promotes angiogenesis. On the other hand, in some pathological situations where plasma prekallikrein is inappropriately activated, excess kinin release in local or systemic circulation is detrimental, through oedema or hypotension. Putative therapeutic application of these clinical and experimental findings through current pharmacological development is discussed in the chapter.
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14
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Goyal N. Novel approaches for the identification of inhibitors of leishmanial dipeptidylcarboxypeptidase. Expert Opin Drug Discov 2013; 8:1127-34. [PMID: 23745836 DOI: 10.1517/17460441.2013.807247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Leishmaniasis imposes a substantial burden of mortality and morbidity affecting 12 million globally and continues to be a neglected tropical disease. Control of the disease is mainly based on chemotherapy, which relies on a handful of drugs with serious limitations. Over the last decade, target-based drug discovery is also being employed in addition to the random screening of compounds. Leishmanial dipeptidylcarboxypeptidase (LDCP), an angiotensin converting enzyme (ACE) related metallopeptidase, has been recently identified as a novel drug target for antileishmanial chemotherapy. AREAS COVERED This article examines dipeptidylcarboxypeptidase (DCP) of Leishmania donovani and of other sources from the international literature regarding their biochemical and structural characterization in comparison to mammalian ACE. Furthermore, the author discusses the identification of LdDCP specific inhibitors by virtual screening and their effect on parasite multiplication. Finally, the review looks ahead at areas for further exploration of DCP inhibitors in Leishmania chemotherapy. EXPERT OPINION The first step in targeted screening is to identify a suitable drug target and its validation followed by its use in high throughput screening of compounds. Limited studies on LDCP inhibitors have established a good correlation between parasite enzyme inhibition and their biological activity. This suggests that there is a potential for LDCP inhibitors as new antileishmanial drugs.
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Affiliation(s)
- Neena Goyal
- CSIR-Central Drug Research Institute, Division of Biochemistry, Chattar Manzil Palace, PO Box 173, Lucknow-226001 (UP), India.
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15
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Bernstein KE, Ong FS, Blackwell WLB, Shah KH, Giani JF, Gonzalez-Villalobos RA, Shen XZ, Fuchs S, Touyz RM. A modern understanding of the traditional and nontraditional biological functions of angiotensin-converting enzyme. Pharmacol Rev 2012; 65:1-46. [PMID: 23257181 DOI: 10.1124/pr.112.006809] [Citation(s) in RCA: 201] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Angiotensin-converting enzyme (ACE) is a zinc-dependent peptidase responsible for converting angiotensin I into the vasoconstrictor angiotensin II. However, ACE is a relatively nonspecific peptidase that is capable of cleaving a wide range of substrates. Because of this, ACE and its peptide substrates and products affect many physiologic processes, including blood pressure control, hematopoiesis, reproduction, renal development, renal function, and the immune response. The defining feature of ACE is that it is composed of two homologous and independently catalytic domains, the result of an ancient gene duplication, and ACE-like genes are widely distributed in nature. The two ACE catalytic domains contribute to the wide substrate diversity of ACE and, by extension, the physiologic impact of the enzyme. Several studies suggest that the two catalytic domains have different biologic functions. Recently, the X-ray crystal structure of ACE has elucidated some of the structural differences between the two ACE domains. This is important now that ACE domain-specific inhibitors have been synthesized and characterized. Once widely available, these reagents will undoubtedly be powerful tools for probing the physiologic actions of each ACE domain. In turn, this knowledge should allow clinicians to envision new therapies for diseases not currently treated with ACE inhibitors.
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Affiliation(s)
- Kenneth E Bernstein
- Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Davis 2021, Los Angeles, CA 90048, USA.
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16
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Lee HA, Cho HM, Lee DY, Kim KC, Han HS, Kim IK. Tissue-Specific Upregulation of Angiotensin-Converting Enzyme 1 in Spontaneously Hypertensive Rats Through Histone Code Modifications. Hypertension 2012; 59:621-6. [DOI: 10.1161/hypertensionaha.111.182428] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The renin-angiotensin system has been implicated in the development of hypertension and damages several organs. The expressions of the components of a local renin-angiotensin system (RAS) in the hypertensive rats differ from those of the normotensive rats. We hypothesized that local tissue-specific upregulation of angiotensin-converting enzyme 1 (ACE1) in hypertension is caused by epigenetic changes. Adrenal gland, aorta, heart, kidney, liver, and lung tissues were excised from normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHRs).
Ace1
mRNA and protein expressions were measured by real-time PCR and Western blot, respectively. Promoter methylation was revealed by bisulfite sequencing. Histone modifications, such as histone 3 acetylation (H3Ac), fourth lysine trimethylation (H3K4me3), and ninth lysine dimethylation (H3K9me2), were quantified by chromatin immunoprecipitation (ChIP), followed by real-time PCR. The expressions and associations of chromatin remodeling genes were analyzed by real-time PCR and ChIP, respectively. Local tissues from SHRs showed higher expressions of
Ace1
mRNA and protein than those from the WKY rats.
Ace1
promoter was mostly unmethylated in all of the tissues from both strains. The
Ace1
promoter regions of SHR tissues were more enriched with H3Ac and H3K4me3, except in the lungs. The adrenal glands, hearts, and kidneys of SHRs showed less enrichment with H3K9me2. Valsartan treatment in SHRs decreased local
Ace1
mRNA and protein expressions, which were accompanied by higher H3K9me2, as well as less H3Ac and H3K4me3. In conclusion, ACE1 is upregulated in local tissues of SHRs via histone code modifications.
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Affiliation(s)
- Hae-Ahm Lee
- From the Department of Pharmacology (H.-A.L., H.-M.C., D.-Y.L., I.K.K.), Cardiovascular Research Institute (H.-A.L., K.-C.K., I.K.K.), Department of Physiology (H.S.H.), and Cell and Matrix Research Institute (H.-A.L., I.K.K.), Kyungpook National University School of Medicine, Daegu, Republic of Korea
| | - Hyun-Min Cho
- From the Department of Pharmacology (H.-A.L., H.-M.C., D.-Y.L., I.K.K.), Cardiovascular Research Institute (H.-A.L., K.-C.K., I.K.K.), Department of Physiology (H.S.H.), and Cell and Matrix Research Institute (H.-A.L., I.K.K.), Kyungpook National University School of Medicine, Daegu, Republic of Korea
| | - Dong-Youb Lee
- From the Department of Pharmacology (H.-A.L., H.-M.C., D.-Y.L., I.K.K.), Cardiovascular Research Institute (H.-A.L., K.-C.K., I.K.K.), Department of Physiology (H.S.H.), and Cell and Matrix Research Institute (H.-A.L., I.K.K.), Kyungpook National University School of Medicine, Daegu, Republic of Korea
| | - Kee-Chul Kim
- From the Department of Pharmacology (H.-A.L., H.-M.C., D.-Y.L., I.K.K.), Cardiovascular Research Institute (H.-A.L., K.-C.K., I.K.K.), Department of Physiology (H.S.H.), and Cell and Matrix Research Institute (H.-A.L., I.K.K.), Kyungpook National University School of Medicine, Daegu, Republic of Korea
| | - Hyung Soo Han
- From the Department of Pharmacology (H.-A.L., H.-M.C., D.-Y.L., I.K.K.), Cardiovascular Research Institute (H.-A.L., K.-C.K., I.K.K.), Department of Physiology (H.S.H.), and Cell and Matrix Research Institute (H.-A.L., I.K.K.), Kyungpook National University School of Medicine, Daegu, Republic of Korea
| | - In Kyeom Kim
- From the Department of Pharmacology (H.-A.L., H.-M.C., D.-Y.L., I.K.K.), Cardiovascular Research Institute (H.-A.L., K.-C.K., I.K.K.), Department of Physiology (H.S.H.), and Cell and Matrix Research Institute (H.-A.L., I.K.K.), Kyungpook National University School of Medicine, Daegu, Republic of Korea
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17
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Synthetic peptides as structural maquettes of Angiotensin-I converting enzyme catalytic sites. Bioinorg Chem Appl 2010:820476. [PMID: 20634989 PMCID: PMC2902127 DOI: 10.1155/2010/820476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Accepted: 03/16/2010] [Indexed: 01/13/2023] Open
Abstract
The rational design of synthetic peptides is proposed as an efficient strategy for the structural investigation of crucial protein domains difficult to be produced. Only after half a century since the function of ACE was first reported, was its crystal structure solved. The main obstacle to be overcome for the determination of the high resolution structure was the crystallization of the highly hydrophobic transmembrane domain. Following our previous work, synthetic peptides and Zinc(II) metal ions are used to build structural maquettes of the two Zn-catalytic active sites of the ACE somatic isoform. Structural investigations of the synthetic peptides, representing the two different somatic isoform active sites, through circular dichroism and NMR experiments are reported.
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18
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Rivière G. L'enzyme de conversion de l'angiotensine : une protéase conservée au cours de l'évolution. ACTA ACUST UNITED AC 2010; 203:281-93. [DOI: 10.1051/jbio/2009032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Nesterovitch AB, Hogarth KD, Adarichev VA, Vinokour EI, Schwartz DE, Solway J, Danilov SM. Angiotensin I-converting enzyme mutation (Trp1197Stop) causes a dramatic increase in blood ACE. PLoS One 2009; 4:e8282. [PMID: 20011602 PMCID: PMC2788243 DOI: 10.1371/journal.pone.0008282] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2009] [Accepted: 11/18/2009] [Indexed: 11/29/2022] Open
Abstract
Background Angiotensin-converting enzyme (ACE) metabolizes many peptides and plays a key role in blood pressure regulation and vascular remodeling. Elevated ACE levels may be associated with an increased risk for different cardiovascular or respiratory diseases, including asthma. Previously, a molecular mechanism underlying a 5-fold familial increase of blood ACE was discovered: Pro1199Leu substitution enhanced the cleavage-secretion process. Carriers of this mutation were Caucasians from Europe (mostly Dutch) or had European roots. Methodology/Principal Findings We have found a family of African-American descent whose affected members' blood ACE level was increased 13-fold over normal. In affected family members, codon TGG coding for Trp1197 was substituted in one allele by TGA (stop codon). As a result, half of ACE expressed in these individuals had a length of 1196 amino acids and lacked a transmembrane anchor. This ACE mutant is not trafficked to the cell membrane and is directly secreted out of cells; this mechanism apparently accounts for the high serum ACE level seen in affected individuals. A haplotype of the mutant ACE allele was determined based on 12 polymorphisms, which may help to identify other carriers of this mutation. Some but not all carriers of this mutation demonstrated airflow obstruction, and some but not all have hypertension. Conclusions/Significance We have identified a novel Trp1197Stop mutation that results in dramatic elevation of serum ACE. Since blood ACE elevation is often taken as a marker of disease activity (sarcoidosis and Gaucher diseases), it is important for clinicians and medical scientists to be aware of alternative genetic causes of elevated blood ACE that are not apparently linked to disease.
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Affiliation(s)
- Andrew B. Nesterovitch
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Kyle D. Hogarth
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Vyacheslav A. Adarichev
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Elena I. Vinokour
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - David E. Schwartz
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Julian Solway
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Sergei M. Danilov
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- National Cardiology Research Center, Moscow, Russia
- * E-mail:
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20
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Renin-Angiotensin System. Cardiovasc Endocrinol 2008. [DOI: 10.1007/978-1-59745-141-3_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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21
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Balyasnikova IV, Metzger R, Franke FE, Conrad N, Towbin H, Schwartz DE, Sturrock ED, Danilov SM. Epitope mapping of mAbs to denatured human testicular ACE (CD143). ACTA ACUST UNITED AC 2008; 72:354-68. [PMID: 18700874 DOI: 10.1111/j.1399-0039.2008.01112.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Angiotensin I-converting enzyme (ACE; CD143) has two homologous enzymatically active domains (N and C) and plays a crucial role in blood pressure regulation and vascular remodeling. A wide spectrum of monoclonal antibodies (mAbs) to different epitopes on the N and C domains of human ACE have been used to study different aspects of ACE biology. In this study, we characterized a set of nine mAbs, developed against the C domain of human ACE, which recognize the denatured forms of ACE and thus are suitable for the detection and quantification of somatic ACE (sACE) and testicular ACE (tACE) using Western blotting and immunohistochemistry on paraffin-embedded human tissues. The epitopes for these mAbs were defined using species cross-reactivity, phage display library screening, Western blotting and ACE mutagenesis. Most of the mAbs recognized common/overlapping region(s) on both somatic and testicular forms of human ACE, whereas mAb 4E10 was relatively specific for the testicular isoform and mAb 5B9 mainly recognized the glycan attached to Asn 731. This set of mAbs is useful for identifying even subtle changes in human ACE conformation because of denaturation. These mAbs are also sensitive tools for the detection of human sACE and tACE in biological fluids and tissues using proteomic approaches. Their high reactivity in paraffin-embedded tissues provides opportunities to study changes in the pattern of ACE expression and glycosylation (particularly with mAb 5B9) in different tissues and cells.
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Affiliation(s)
- I V Balyasnikova
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, IL, USA
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22
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Naperova IA, Balyasnikova IV, Schwartz DE, Watermeyer J, Sturrock ED, Kost OA, Danilov SM. Mapping of conformational mAb epitopes to the C domain of human angiotensin I-converting enzyme. J Proteome Res 2008; 7:3396-411. [PMID: 18576678 DOI: 10.1021/pr800142w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Angiotensin I-converting enzyme (ACE, CD143) has two homologous domains, each having a functional active site. Fine epitope mapping of 8 mAbs to the C-terminal domain of human ACE was carried out using plate precipitation assays, mAbs' cross-reactivity with ACE from different species, site-directed mutagenesis, and antigen- and cell-based ELISAs. Almost all epitopes contained potential glycosylation sites. Therefore, these mAbs could be used to distinguish different glycoforms of ACE expressed in different tissues or cell lines. mAbs 1B8 and 3F10 were especially sensitive to the composition of the N-glycan attached to Asn 731; mAbs 2H9 and 3F11 detected the glycosylation status of the glycan attached to Asn 685 and perhaps Asn1162; and mAb 1E10 and 4E3 recognized the glycan on Asn 666. The epitope of mAb 1E10 is located at the N-terminal end of the C domain, close to the unique 36 amino acid residues of testicular ACE (tACE). Moreover, it binds preferentially to tACE on the surface of human spermatozoa and thus may find application as an immunocontraceptive drug. mAb 4E3 was the best mAb for quantification of ACE-expressing somatic cells by flow cytometry. In contrast to the other mAbs, binding of mAb 2B11 was not markedly influenced by ACE glycosylation or by the cell culture conditions or cell types, making this mAb a suitable reference antibody. Epitope mapping of these C-domain mAbs, particularly those that compete with N-domain mAbs, enabled us to propose a model of the two-domain somatic ACE that might explain the interdomain cooperativity. Our findings demonstrated that mAbs directed to conformational epitopes on the C-terminal domain of human ACE are very useful for the detection of testicular and somatic ACE, quantification using flow cytometry and ELISA assays, and for the study of different aspects of ACE biology.
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Affiliation(s)
- Irina A Naperova
- Chemistry Faculty, Moscow State University, Russia, Department of Anesthesiology, University of Illinois at Chicago, Chicago, IL 60612, USA
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23
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Lemeire E, Vanholme B, Van Leeuwen T, Van Camp J, Smagghe G. Angiotensin-converting enzyme in Spodoptera littoralis: molecular characterization, expression and activity profile during development. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2008; 38:166-175. [PMID: 18207078 DOI: 10.1016/j.ibmb.2007.10.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2007] [Revised: 10/07/2007] [Accepted: 10/09/2007] [Indexed: 05/25/2023]
Abstract
The characterization of the full-length angiotensin-converting enzyme (ACE) cDNA sequence of the lepidopteran Spodoptera littoralis is reported in this study. The predicted open reading frame encodes a 647 amino acids long protein (SlACE) and shows 63.6% identity with the Bombyx mori ACE sequence. A 3D-model, consisting of 26 alpha-helices and three beta-sheets, was predicted for the sequence. SlACE expression was studied in the embryonic, larval and pupal stages of S. littoralis and in different tissues of the last larval stage by reverse-transcribed PCR. This revealed that the gene is expressed throughout the life cycle and especially in brain, gut and fat body tissue of the last stage. These results are in agreement with a role of ACE in the metabolism of neuropeptides and gut hormones. In addition, ACE activity has been studied in more detail during development, making use of a fluorescent assay. High ACE peptidase activity coincides with every transition state, from embryo to larva, from larva to larva and from larva to pupa. A peak value in activity occurs during the early pupal stage. These results indicate the importance of SlACE during metamorphosis and reveal the high correlation of ACE activity with the insect's development, which is regulated by growth and developmental hormones.
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Affiliation(s)
- Els Lemeire
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium.
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24
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Carmona AK, Schwager SL, Juliano MA, Juliano L, Sturrock ED. A continuous fluorescence resonance energy transfer angiotensin I-converting enzyme assay. Nat Protoc 2007; 1:1971-6. [PMID: 17487185 DOI: 10.1038/nprot.2006.306] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Angiotensin I-converting enzyme (ACE) is involved in various physiological and physiopathological conditions; therefore, the measurement of its catalytic activity may provide essential clinical information. This protocol describes a sensitive and rapid procedure for determination of ACE activity using fluorescence resonance energy transfer (FRET) substrates containing o-aminobenzoic acid (Abz) as the fluorescent group and 2,4-dinitrophenyl (Dnp) as the quencher acceptor. Hydrolysis of a peptide bond between the donor/acceptor pair generates fluorescence that can be detected continuously, allowing quantitative measurement of the enzyme activity. The FRET substrates provide a useful tool for kinetic studies and for ACE determination in biological fluids and crude tissue extracts. An important benefit of this method is the use of substrates selective for the two active sites of the enzyme, namely Abz-SDK(Dnp)P-OH for N-domain, Abz-LFK(Dnp)-OH for C-domain and Abz-FRK(Dnp)P-OH for somatic ACE. This methodology can be adapted for determinations using a 96-well fluorescence plate reader.
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Affiliation(s)
- Adriana K Carmona
- Department of Biophysics, Escola Paulista de Medicina, Universidade Federal de São Paulo, SP, Brazil
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25
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Ronchi FA, Irigoyen MC, Casarini DE. Association of somatic and N-domain angiotensin-converting enzymes from Wistar rat tissue with renal dysfunction in diabetes mellitus. J Renin Angiotensin Aldosterone Syst 2007; 8:34-41. [PMID: 17487824 DOI: 10.3317/jraas.2007.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Diabetes mellitus (DM) is characterised by alterations in the intrarenal renin-angiotensin system (RAS). Insulin treatment may reverse these changes by an unknown mechanism. We aimed to verify the association between somatic ACE with 136 kDa (sACE) and N-domain ACE with 69 kDa (nACE) from Wistar (W) rat tissue with DM. Three groups were studied: control (CT), insulin treated diabetic (DT) and untreated (D). ACE activity was determined using Hippuryl-His-Leu and Z-Phe-His-Leu as substrates. In D group, urine ACE activity increased for both substrates when compared with CT and DT, despite the decreased activity of renal tissues. Immunostaining of renal tissue demonstrated that ACE is more strongly expressed in the proximal-tubule of D than in the same nephron portion in the other groups. Angiotensin (Ang) 1-7 and Ang II are less expressed in DT group when compared with CT and D. Ang II levels decreased in the D and DT groups showed when compared to the control. Ang 1-7 was detected in all studied groups with low levels in DT. The modulation of angiotensin peptides suggests that sACE, nACE, ACE 2 and NEP could have important functions in renal RAS regulation through a counter-regulatory mechanism to protect the kidney in diabetes mellitus.
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26
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Rivière G, Michaud A, Corradi HR, Sturrock ED, Ravi Acharya K, Cogez V, Bohin JP, Vieau D, Corvol P. Characterization of the first angiotensin-converting like enzyme in bacteria: Ancestor ACE is already active. Gene 2007; 399:81-90. [PMID: 17597310 PMCID: PMC7127174 DOI: 10.1016/j.gene.2007.05.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2007] [Revised: 05/04/2007] [Accepted: 05/04/2007] [Indexed: 12/02/2022]
Abstract
Angiotensin-converting enzyme (ACE) is a metallopeptidase that converts angiotensin I into angiotensin II. ACE is crucial in the control of cardiovascular and renal homeostasis and fertility in mammals. In vertebrates, both transmembrane and soluble ACE, containing one or two active sites, have been characterized. So far, only soluble, single domain ACEs from invertebrates have been cloned, and these have been implicated in reproduction in insects. Furthermore, an ACE-related carboxypeptidase was recently characterized in Leishmania, a unicellular eukaryote, suggesting the existence of ACE in more distant organisms. Interestingly, in silico databank analysis revealed that bacterial DNA sequences could encode putative ACE-like proteins, strikingly similar to vertebrates' enzymes. To gain more insight into the bacterial enzymes, we cloned the putative ACE from the phytopathogenic bacterium, Xanthomonas axonopodis pv. citri, named XcACE. The 2 kb open reading frame encodes a 672-amino-acid soluble protein containing a single active site. In vitro expression and biochemical characterization revealed that XcACE is a functional 72 kDa dipeptidyl-carboxypeptidase. As in mammals, this metalloprotease hydrolyses angiotensin I into angiotensin II. XcACE is sensitive to ACE inhibitors and chloride ions concentration. Variations in the active site residues, highlighted by structural modelling, can account for the different substrate selectivity and inhibition profile compared to human ACE. XcACE characterization demonstrates that ACE is an ancestral enzyme, provoking questions about its appearance and structure/activity specialisation during the course of evolution.
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Affiliation(s)
- Guillaume Rivière
- Unité Neurosciences et Physiologie Adaptative, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cédex, France.
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27
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Sabatini RA, Bersanetti PA, Farias SL, Juliano L, Juliano MA, Casarini DE, Carmona AK, Paiva ACM, Pesquero JB. Determination of angiotensin I-converting enzyme activity in cell culture using fluorescence resonance energy transfer peptides. Anal Biochem 2007; 363:255-62. [PMID: 17320031 DOI: 10.1016/j.ab.2007.01.020] [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: 12/05/2006] [Revised: 01/13/2007] [Accepted: 01/17/2007] [Indexed: 10/23/2022]
Abstract
An assay using fluorescence resonance energy transfer peptides was developed to assess angiotensin I-converting enzyme (ACE) activity directly on the membrane of transfected Chinese hamster ovary cells (CHO) stably expressing the full-length somatic form of the enzyme. The advantage of the new method is the possibility of using selective substrates for the two active sites of the enzyme, namely Abz-FRK(Dnp)P-OH for somatic ACE, Abz-SDK(Dnp)P-OH for the N domain, and Abz-LFK(Dnp)-OH for the C domain. Hydrolysis of a peptide bond between the donor/acceptor pair (Abz/Dnp) generates detectable fluorescence, allowing quantitative measurement of the enzymatic activity. The kinetic parameter K(m) for the hydrolysis of the three substrates by ACE in this system was also determined and the values are comparable to those obtained using the purified enzyme in solution. The specificity of the activity was demonstrated by the complete inhibition of the hydrolysis by the ACE inhibitor lisinopril. Therefore, the results presented in this work show for the first time that determination of ACE activity directly on the surface of intact CHO cells is feasible and that the method is reliable and sensitive. In conclusion, we describe a methodology that may represent a new tool for the assessment of ACE activity which will open the possibility to study protein interactions in cells in culture.
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Affiliation(s)
- R A Sabatini
- Department of Biophysics, Universidade Federal de São Paulo-Escola Paulista de Medicina, São Paulo, Brazil
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Lemeire E, Van Camp J, Smagghe G. Presence of angiotensin converting enzyme isoforms in larval lepidoptera (Spodoptera littoralis). Peptides 2007; 28:119-26. [PMID: 17161503 DOI: 10.1016/j.peptides.2006.08.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2006] [Revised: 08/09/2006] [Accepted: 08/09/2006] [Indexed: 10/23/2022]
Abstract
In this research the presence of angiotensin converting enzyme (ACE) in larvae of the lepidopteran Spodoptera littoralis was evaluated. Making use of the substrate Abz-FRK-(Dnp)P-OH and the specific inhibitor captopril at 10 microM, ACE activity was determined in a fluorescence assay for intact larvae, hemolymph, head, midgut and dorsal tissue. In dorsal tissue and hemolymph, ACE activity was highest. These data are consistent with a possible role for ACE in contractions of the dorsal vessel and metabolism of circulating peptide hormones in the hemolymph. After the presence of ACE was confirmed, a sequential procedure of anion exchange and size exclusion chromatography was applied to purify ACE from whole wandering larvae (last stage). With this procedure, three different ACE pools were collected that cleaved the fluorogenic substrate Abz-FRK-(Dnp)P-OH. Activity could be inhibited by a final concentration of 2.5 microM captopril. In addition, two out of three samples eluted at different salt concentration and thus ACE 1, 2 and 3 represent at least two different ACE isoforms. These data reveal that ACE is present in S. littoralis and that at least two out of three isolated ACE forms are truly isoforms.
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Affiliation(s)
- E Lemeire
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium.
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Takeuchi K, Araki H, Sakaue T, Yamamoto Y, Fujiwara M, Nishi K, Ohkubo I. Porcine germinal angiotensin I-converting enzyme: isolation, characterization and molecular cloning. Comp Biochem Physiol B Biochem Mol Biol 2006; 146:215-26. [PMID: 17145192 DOI: 10.1016/j.cbpb.2006.10.108] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2006] [Revised: 10/13/2006] [Accepted: 10/20/2006] [Indexed: 11/18/2022]
Abstract
Germinal angiotensin I-converting enzyme (gACE) was purified to homogeneity from porcine seminal plasma. The molecular weight of the purified enzyme was calculated to be 182,000 on non-denaturing PAGE and 94,000 and 93,000 on SDS-PAGE in the absence and presence of beta-ME, respectively. These findings suggest that the enzyme is composed of two identical subunits in seminal plasma. The K(m), V(max), K(cat) and K(cat)/K(m) values of gACE at optimal pH (pH 7.2) were 680 microM, 1.0 micromol/mg/min, 33.1 s(-1) and 4.87 x 10(4) s(-1) M(-1) for Z-Val-Lys-Met-MCA, respectively. gACE was potently inhibited by EDTA, 1,10-phenanthroline, captopril and lisinopril, and it promptly released the dipeptides His-Leu and Phe-Arg from angiotensin I and bradykinin. Met- and Leu-enkephalins, neuromedine B and beta-neo-endorphin were also good natural substrates for gACE. We determined the structure of gACE cDNA from the porcine testis, and deduced the amino acid sequence of gACE. The cDNA is composed of 2508 bp of nucleotides in length and encodes 745 amino acids in the coding region. The overall homology of amino acid sequences between porcine, human, sheep and rat gACEs is 72.6 to 84.7%. Zinc-binding motif, chloride-binding site and positions of cysteine residues were well conserved.
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Affiliation(s)
- Keisuke Takeuchi
- Department of Medical Biochemistry, Shiga University of Medical Science, Seta, Otsu, Japan
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Abstract
Since the first identification of renin by Tigerstedt and Bergmann in 1898, the renin-angiotensin system (RAS) has been extensively studied. The current view of the system is characterized by an increased complexity, as evidenced by the discovery of new functional components and pathways of the RAS. In recent years, the pathophysiological implications of the system have been the main focus of attention, and inhibitors of the RAS such as angiotensin-converting enzyme (ACE) inhibitors and angiotensin (ANG) II receptor blockers have become important clinical tools in the treatment of cardiovascular and renal diseases such as hypertension, heart failure, and diabetic nephropathy. Nevertheless, the tissue RAS also plays an important role in mediating diverse physiological functions. These focus not only on the classical actions of ANG on the cardiovascular system, namely, the maintenance of cardiovascular homeostasis, but also on other functions. Recently, the research efforts studying these noncardiovascular effects of the RAS have intensified, and a large body of data are now available to support the existence of numerous organ-based RAS exerting diverse physiological effects. ANG II has direct effects at the cellular level and can influence, for example, cell growth and differentiation, but also may play a role as a mediator of apoptosis. These universal paracrine and autocrine actions may be important in many organ systems and can mediate important physiological stimuli. Transgenic overexpression and knock-out strategies of RAS genes in animals have also shown a central functional role of the RAS in prenatal development. Taken together, these findings may become increasingly important in the study of organ physiology but also for a fresh look at the implications of these findings for organ pathophysiology.
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Affiliation(s)
- Martin Paul
- Institute of Clinical Pharmacology and Toxicology, Campus Benjamin Franklin, Charité-University Medicine Berlin, Berlin, Germany
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Abstract
Inhibition of the angiotensin-converting enzyme (ACE) protects against the progression of several cardiovascular diseases. Because of its dual role in regulating angiotensin II and bradykinin levels, the positive clinical effects of ACE inhibitors were thought to be the consequence of concomitant reductions in the production of angiotensin II and the degradation of bradykinin. Recent evidence suggests that some of the beneficial effects of ACE inhibitors on cardiovascular function and homeostasis can be attributed to novel mechanisms. These include the accumulation of the ACE substrate N-acetyl-seryl-aspartyl-lysyl-proline, which blocks collagen deposition in the injured heart, as well as the activation of an ACE signaling cascade that involves the activation of the kinase CK2 and the c-Jun N-terminal kinase in endothelial cells and leads to changes in gene expression. Moreover, at least one other ACE homologue (ACE2) is proposed to counteract the detrimental effects associated with the activation of the classical renin-angiotensin system. These data reveal hitherto unexpected levels of internal regulation of the renin-angiotensin system.
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Affiliation(s)
- Ingrid Fleming
- Vascular Signalling Group, Institut für Kardiovaskuläre Physiologie, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany.
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Kohlstedt K, Gershome C, Friedrich M, Müller-Esterl W, Alhenc-Gelas F, Busse R, Fleming I. Angiotensin-converting enzyme (ACE) dimerization is the initial step in the ACE inhibitor-induced ACE signaling cascade in endothelial cells. Mol Pharmacol 2006; 69:1725-32. [PMID: 16476786 DOI: 10.1124/mol.105.020636] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The binding of angiotensin-converting enzyme (ACE) inhibitors to ACE initiates a signaling cascade that involves the phosphorylation of the enzyme on Ser1270 as well as activation of the c-Jun NH2-terminal kinase (JNK) and leads to alterations in gene expression. To clarify how ACE inhibitors activate this pathway, we determined their effect on the ability of the enzyme to dimerize and the role of ACE dimerization in the initiation of the ACE signaling cascade. In endothelial cells, ACE was detected as a monomer as well as a dimer in native gel electrophoresis and dimerization/oligomerization was confirmed using the split-ubiquitin assay in yeast. ACE inhibitors elicited a rapid, concentration-dependent increase in the dimer/monomer ratio that correlated with that of the ACE inhibitorinduced phosphorylation of ACE. Cell treatment with galactose and glucose to prevent the putative lectin-mediated self-association of ACE or with specific antibodies shielding the N terminus of ACE failed to affect either the basal or the ACE inhibitor-induced dimerization of the enzyme. In ACE-expressing Chinese hamster ovary cells, ACE inhibitors elicited ACE dimerization and phosphorylation as well as the activation of JNK with similar kinetics to those observed in endothelial cells. However, these effects were prevented by the mutation of the essential Zn2+-complexing histidines in the C-terminal active site of the enzyme. Mutation of the N-terminal active site of ACE was without effect. Together, our data suggest that ACE inhibitors can initiate the ACE signaling pathway by inducing ACE dimerization, most probably via the C-terminal active site of the enzyme.
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Affiliation(s)
- Karin Kohlstedt
- Vascular Signalling Group, Institut für Kardiovaskuläre Physiologie, Johann Wolfgang Goethe-Universität, Theodor-Stern-Kai 7, D-60590 Frankfurt am Main, Germany
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33
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Ronchi FA, Andrade MCC, Carmona AK, Krieger JE, Casarini DE. N-domain angiotensin-converting enzyme isoform expression in tissues of Wistar and spontaneously hypertensive rats. J Hypertens 2005; 23:1869-78. [PMID: 16148611 DOI: 10.1097/01.hjh.0000183523.66123.95] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND Angiotensin I-converting enzyme (ACE) is a protein containing two active sites, called N- and C-domains, according to their position in the protein. AIM The aim of the present study was to verify whether the expression of the N-domain ACEs detected in the urine of Wistar and spontaneously hypertensive (SHR) rats was restricted to the kidney. METHODS Adrenal, aorta, heart, liver, lung, kidney and testicle tissue from Wistar rats and spontaneously hypertensive rats were homogenized in assay buffer and analyzed by gel filtration, Western blotting and radio-immunoassay. RESULTS Two peaks (at 136 and 69 kDa) with ACE activity upon ZPhe-His-Leu were separated by gel filtration from homogenate tissues of Wistar rats, in contrast with the tissue from hypertensive rats, which showed ACE forms of 96 and 69 kDa. The bands detected by Western blotting for all studied tissue from Wistar and spontaneously hypertensive rats showed a correspondence with the two peaks containing ACE activity detected in the polyacrylamide gel slices. Angiotensin II levels were increased in hypertensive rat tissue when compared with Wistar rat tissues. In addition, captopril 3 micromol/l inhibited the enzymic activity, where the Km was in the order of mmol/l and micromol/l using hippuryl-His-Leu and Abz-Ser-Asp-Lys(Dnp)Pro-OH as substrates, respectively. All tissues from Wistar rats presented ACE with 136 kDa, similar to somatic ACE, and N-domain ACE with 69 kDa. In the same tissue of spontaneously hypertensive rats, 96 and 69 kDa N-domain ACEs were detected. CONCLUSIONS Our results demonstrated that N-domain ACEs were not exclusively produced in the kidney and excreted in the urine; they were expressed in all tissue studied, suggesting that these enzymes could influence local angiotensin II production, contributing to organ-specific regulation.
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Affiliation(s)
- Fernanda A Ronchi
- Nephrology Division, Department of Medicine, Federal University of São Paulo, Brazil
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Thimon V, Métayer S, Belghazi M, Dacheux F, Dacheux JL, Gatti JL. Shedding of the Germinal Angiotensin I-Converting Enzyme (gACE) Involves a Serine Protease and Is Activated by Epididymal Fluid1. Biol Reprod 2005; 73:881-90. [PMID: 15987822 DOI: 10.1095/biolreprod.105.042929] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The present report describes how the soluble germinal angiotensin I-converting enzyme (gACE) appears in the epididymal fluid, where it has been identified in some laboratory rodents and domestic ungulates. We showed that this gACE results from an active proteolytic process that releases the enzyme's extracellular domain from sperm in a precise spatiotemporal location during epididymal transit and that this process involves serine protease activity. Using polyclonal antibodies against the C-terminal intracellular sequence of ACE, a fragment of approximately 10 kDa was detected on the sperm extract only in the epididymal region, where the gACE release occurs. The fluid enzyme was purified, and the cleavage site was determined by mass spectrometry to be between Arg622 and Leu623 of the mature sheep gACE sequence (equivalent to Arg627 and Arg1203 of the human mature gACE and somatic ACE sequences, respectively). Thereafter, the C-terminal Arg was removed, leaving Ala621 as a C-terminal. Using an in vitro assay, gACE cleavage from sperm was strongly increased by the presence of epididymal fluid from the release zone, and this increase was inhibited specifically by the serine protease-inhibitor AEBSF but not by para-aminobenzamidine. None of the other inhibitors tested, such as metallo- or cystein-protease inhibitors, had a similar effect on release. It was also found that this process did not involve changes in gACE phosphorylation.
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Affiliation(s)
- Véronique Thimon
- Gamètes Mâles et Fertilité, UMR 6175 INRA-CNRS-Université de Tours-Haras Nationaux, Nouzilly, France
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35
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Theoretical Study of Gas-Phase Acidities of Selected Angiotensin-Converting Enzyme Inhibitors. Struct Chem 2005. [DOI: 10.1007/s11224-005-6348-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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36
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Balyasnikova IV, Sun ZL, Franke FE, Berestetskaya YV, Chubb AJ, Albrecht RF, Sturrock ED, Danilov SM. Monoclonal antibodies 1B3 and 5C8 as probes for monitoring the integrity of the C-terminal end of soluble angiotensin-converting enzyme. Hybridoma (Larchmt) 2005; 24:14-26. [PMID: 15785205 DOI: 10.1089/hyb.2005.24.14] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Angiotensin-converting enzyme (ACE) is a membrane-anchored ectoprotein that is proteolytically cleaved, yielding an enzymatically active soluble ACE. Two mouse monoclonal antibodies, MAbs 1B3 and 5C8, were generated to the C-terminal part of human soluble ACE. MAb 1B3 recognized the catalytically active ACE, as revealed by ELISA and precipitation assays, whereas Western blotting and immunohistochemisty on paraffin- embedded sections using MAb 5C8 detected denatured ACE. MAb 1B3 showed extensive cross-reactivity, recognizing 15 species out of the 16 tested. The binding of this MAb to ACE was greatly affected by conformational changes induced by adsorption on plastic, formalin fixation, and underglycosylation. Furthermore, MAb 1B3 binding to the mutated ACE (Pro1199Leu substitution in the juxtamembrane region, leading to a fivefold increase in serum ACE level) was markedly decreased. MAb 5C8 detected all the known expression sites of full-size ACE using formalin-fixed and paraffin-embedded human tissues. The sequential epitope for MAb 5C8 is formed by the last 11 amino acid residues of soluble ACE (Pro1193-Arg1203), whereas the conformational epitope for 1B3 is formed by a motif within these 11 amino acid residues and, in addition, by at least one stretch that includes Ala837-His839 located distal to the sequential epitope. Our findings demonstrated that MAbs 1B3 and 5C8 are very useful for the study of ACE shedding, for identification of mutations in stalk regions, and for studying alternatively spliced variants of ACE. In addition, binding of MAb 1B3 is a sensitive determinant of the integrity of soluble ACE.
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Affiliation(s)
- Irina V Balyasnikova
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, Illinois 60612, USA
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37
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Alves MF, Araujo MC, Juliano MA, Oliveira EM, Krieger JE, Casarini DE, Juliano L, Carmona AK. A continuous fluorescent assay for the determination of plasma and tissue angiotensin I-converting enzyme activity. Braz J Med Biol Res 2005; 38:861-8. [PMID: 15933779 DOI: 10.1590/s0100-879x2005000600007] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A continuous assay using internally quenched fluorescent peptides with the general sequence Abz-peptidyl-(Dnp)P-OH (Abz = ortho-aminobenzoic acid; Dnp = 2,4-dinitrophenyl) was optimized for the measurement of angiotensin I-converting enzyme (ACE) in human plasma and rat tissues. Abz-FRK(Dnp)P-OH, which was cleaved at the Arg-Lys bond by ACE, was used for the enzyme evaluation in human plasma. Enzymatic activity was monitored by continuous recording of the fluorescence (lambda ex = 320 nm and lambda em = 420 nm) at 37 degrees C, in 0.1 M Tris-HCl buffer, pH 7.0, with 50 mM NaCl and 10 microM ZnCl2. The assays can be performed directly in the cuvette of the fluorimeter and the hydrolysis followed for 5 to 10 min. ACE measurements in the plasma of 80 healthy patients with Hip-His-Leu and with Abz-FRK(Dnp)P-OH correlated closely (r = 0.90, P < 0.001). The specificity of the assay was demonstrated by the complete inhibition of hydrolysis by 0.5 microM lisinopril or captopril. Abz-FRK(Dnp)P-OH cleavage by ACE was monitored in rat lung, kidney, heart, and liver homogenates in the presence of a cocktail of inhibitors containing trans-epoxy-succinyl-L-leucylamido-(4-guanido)-butene, pepstatin, phenyl-methylsulfonyl fluoride, N-tosyl-L-phenylalanyl-chloromethyl ketone, and N-tosyl-lysyl-chloromethyl ketone to prevent undesirable hydrolysis. ACE activity in lung, heart and kidney homogenates, but not in liver homogenates, was completely abolished by 0.5 microM lisinopril or captopril. The advantages of the method are the procedural simplicity and the high sensitivity providing a rapid assay for ACE determinations.
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Affiliation(s)
- M F Alves
- Departamento de Biofísica, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brasil
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38
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Galanis AS, Spyroulias GA, Pairas G, Manessi-Zoupa E, Cordopatis P. Solid-phase synthesis and conformational properties of angiotensin converting enzyme catalytic-site peptides: the basis for a structural study on the enzyme-substrate interaction. Biopolymers 2005; 76:512-26. [PMID: 15508121 DOI: 10.1002/bip.20163] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The solution NMR conformational properties of two angiotensin converting enzyme (ACE) Zn catalytic-site 36-residue peptides, with the general sequence HEMGHX23EAIGDX3, synthesized through solid-phase 9-fluorenylmethoxycarbonyl (Fmoc) chemistry, is reported. The 1H resonance assignment of Zn-bound peptides is presented and the characteristic features of the NMR solution models of the two ACE Zn(II)-bound peptides are reported. The solid-state and solution structures of the ACE C-domain catalytic site are compared while biologically important structural similarities and differences of the N- and C-terminal catalytic sites are discussed. Additionally, the structural features of the ACE substrate, the angiotensin I (AI) decapeptide, are studied using NMR spectroscopy, in order to set the structural basis for the ACE-substrate interaction in solution.
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Andújar-Sánchez M, Cámara-Artigas A, Jara-Pérez V. A calorimetric study of the binding of lisinopril, enalaprilat and captopril to angiotensin-converting enzyme. Biophys Chem 2004; 111:183-9. [PMID: 15381315 DOI: 10.1016/j.bpc.2004.05.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2004] [Revised: 05/18/2004] [Accepted: 05/26/2004] [Indexed: 11/25/2022]
Abstract
The angiotensin I-converting enzyme (ACE; EC.3.4.15.1) is a dipeptidyl carboxypeptidase that plays a central role in blood pressure regulation. The somatic form of the enzyme is composed of two highly similar domains, usually referred to as N and C domains, each containing one active site. Nevertheless, a 1:1 stoichiometry for the binding of lisinopril, captopril or enalaprilat to somatic pig lung ACE is shown by isothermal titration calorimetry (ITC) and enzymatic assays. The binding of the three inhibitors at neutral pH is very tight and the enthalpy changes are positive, indicating that the binding is entropically driven. The origin of this thermodynamic signature is discussed under the new structural information available.
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Affiliation(s)
- M Andújar-Sánchez
- Departamento Química Física, Bioquímica y Química Inorgánica, Universidad de Almería, Carretera Sacramento s/n, Almería 04120, Spain
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Macours N, Poels J, Hens K, Francis C, Huybrechts R. Structure, evolutionary conservation, and functions of angiotensin- and endothelin-converting enzymes. INTERNATIONAL REVIEW OF CYTOLOGY 2004; 239:47-97. [PMID: 15464852 PMCID: PMC7126198 DOI: 10.1016/s0074-7696(04)39002-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Angiotensin-converting enzyme, a member of the M2 metalloprotease family, and endothelin-converting enzyme, a member of the M13 family, are key components in the regulation of blood pressure and electrolyte balance in mammals. From this point of view, they serve as important drug targets. Recently, the involvement of these enzymes in the development of Alzheimer's disease was discovered. The existence of homologs of these enzymes in invertebrates indicates that these enzyme systems are highly conserved during evolution. Most invertebrates lack a closed circulatory system, which excludes the need for blood pressure regulators. Therefore, these organisms represent excellent targets for gaining new insights and revealing additional physiological roles of these important enzymes. This chapter reviews the structural and functional aspects of ACE and ECE and will particularly focus on these enzyme homologues in invertebrates.
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Affiliation(s)
- Nathalie Macours
- Laboratory for Developmental Physiology, Genomics and Proteomics, Katholieke Universteit Leuven, Naamsestraat 59, B-3000 Leuven, Belgium
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41
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Fernandez JH, Hayashi MAF, Camargo ACM, Neshich G. Structural basis of the lisinopril-binding specificity in N- and C-domains of human somatic ACE. Biochem Biophys Res Commun 2003; 308:219-26. [PMID: 12901857 DOI: 10.1016/s0006-291x(03)01363-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Angiotensin I-converting enzyme (ACE) is a dipeptidyl carboxypeptidase which converts angiotensin I into the vasopressor peptide angiotensin II and also inactivates the hypotensive peptide bradykinin, playing an important role in blood pressure regulation. The present work describes the molecular modeling of the N-terminal human somatic ACE in complex with the inhibitor lisinopril, identifying the residues involved in the inhibitor-binding pocket. The obtained results identify differences in the lisinopril lysine moiety-binding residues for N- and C-terminals of sACE domains and an important carboxy-terminal proline hydrophobic accommodations mediated by the aromatic ring of Tyr532 and Tyr1128 residues, respectively. The present model will be useful for the development of a new inhibitor family based on the natural BPP peptides and derivatives, or even to improve the binding capacities and the domain specificity of the already known inhibitors.
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42
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Cal S, Quesada V, Garabaya C, Lopez-Otin C. Polyserase-I, a human polyprotease with the ability to generate independent serine protease domains from a single translation product. Proc Natl Acad Sci U S A 2003; 100:9185-90. [PMID: 12886014 PMCID: PMC170893 DOI: 10.1073/pnas.1633392100] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2003] [Indexed: 01/27/2023] Open
Abstract
We have identified and cloned a human liver cDNA encoding an unusual mosaic polyprotein, called polyserase-I (polyserine protease-I). This protein exhibits a complex domain organization including a type II transmembrane motif, a low-density lipoprotein receptor A module, and three tandem serine protease domains. This unusual modular architecture is also present in the sequences predicted for mouse and rat polyserase-I. Human polyserase-I gene maps to 19p13, and its last exon overlaps with that corresponding to the 3' UTR of the gene encoding translocase of mitochondrial inner membrane 13. Northern blot analysis showed the presence of a major polyserase-I transcript of 5.4 kb in human fetal and adult tissues and in tumor cell lines. Analysis of processing mechanisms of polyserase-I revealed that it is synthesized as a membrane-associated polyprotein that is further processed to generate three independent serine protease units. Two of these domains are proteolytically active against synthetic peptides commonly used for assaying serine proteases. These proteolytic activities of the polyserase-I units are blocked by serine protease inhibitors. We show an example of generation of separate serine protease domains from a single translation product in human tissues and illustrate an additional mechanism for expanding the complexity of the human degradome, the entire protease complement of human cells and tissues.
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Affiliation(s)
- Santiago Cal
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología, Universidad de Oviedo, 33006-Oviedo, Spain
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43
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Hayakari M, Satoh K, Izumi H, Kudoh T, Asano J, Yamazaki T, Tsuchida S. Kinetic-controlled hydrolysis of Leu-Val-Val-hemorphin-7 catalyzed by angiotensin-converting enzyme from rat brain. Peptides 2003; 24:1075-82. [PMID: 14499287 DOI: 10.1016/s0196-9781(03)00178-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Leu-Val-Val-hemorphin-7 (LVV-H7, LVVYPWTQRY), an opioid peptide, was found to be hydrolyzed sequentially by rat brain angiotensin-converting enzyme (ACE) in three steps through dipeptidyl carboxypeptidase activity. The kinetic constants evaluated were in order of: k(1) (0.19 min(-1))>>k(2) (0.0008 min(-1)) approximately k(3) (0.0006 min(-1)) in 10 mM NaCl at pH 7.5 giving rise to LVV-H5 almost quantitatively. The decapeptide was noted to be hydrolyzed 164- and 346-fold more efficiently than angiotensin I (Ang I) in k(cat) and kcat/Km values, respectively, at their optimal conditions. The kinetic-controlled preferential action of the brain enzyme on LVV-H7 is suggestive of its multiple roles in vivo.
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Affiliation(s)
- Makoto Hayakari
- Second Department of Biochemistry, School of Medicine, Hirosaki University, 5 Zaifu-Cho, Hirosaki 036-8562, Japan.
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44
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Galanis AS, Spyroulias GA, Pierattelli R, Tzakos A, Troganis A, Gerothanassis IP, Pairas G, Manessi-Zoupa E, Cordopatis P. Zinc binding in peptide models of angiotensin-I converting enzyme active sites studied through 1H-NMR and chemical shift perturbation mapping. Biopolymers 2003; 69:244-52. [PMID: 12767125 DOI: 10.1002/bip.10362] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We report the design and synthesis through solid phase 9-flourenylmethoxycarbonyl (Fmoc) chemistry of the two angiotensin-I converting enzyme active sites possessing the general sequence HEMGHX(23)EAIGDX(3). Their zinc-binding properties were monitored in solution through high-resolution (1)H-NMR. The obtained data were analyzed in terms of chemical shift differences. The results indicate that zinc binds to the HEMGH and the EAIGD characteristic motifs, and suggest possible coordination modes of zinc in the native enzyme.
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45
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Cole JM, Xiao H, Adams JW, Disher KM, Zhao H, Bernstein KE. New approaches to genetic manipulation of mice: tissue-specific expression of ACE. Am J Physiol Renal Physiol 2003; 284:F599-607. [PMID: 12620918 DOI: 10.1152/ajprenal.00308.2002] [Citation(s) in RCA: 13] [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] Open
Abstract
The renin-angiotensin system (RAS) plays a central role in body physiology, controlling blood pressure and blood electrolyte composition. ACE.1 (null) mice are null for all expression of angiotensin-converting enzyme (ACE). These mice have low blood pressure, the inability to concentrate urine, and a maldevelopment of the kidney. In contrast, ACE.2 (tissue null) mice produce one-third normal plasma ACE but no tissue ACE. They also have low blood pressure and cannot concentrate urine, but they have normal indices of renal function. These mice, while very informative, show that the null approach to creating knockout mice has intrinsic limitations given the many different physiological systems that no longer operate in an animal without a functioning RAS. To investigate the fine control of body physiology by the RAS, we developed a novel promoter swapping approach to generate a more selective tissue knockout of ACE expression. We used this to create ACE.3 (liver ACE) mice that selectively express ACE in the liver but lack all ACE within the vasculature. Evaluation of these mice shows that endothelial expression of ACE is not required for blood pressure control or normal renal function. Targeted homologous recombination has the power to create new strains of mice expressing the RAS in selected subsets of tissues. Not only will these new genetic models be useful for studying blood pressure regulation but also they show great promise for the investigation of the function of the RAS in complicated disease models.
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Affiliation(s)
- Justin M Cole
- Department of Pathology, Emory University, Atlanta, Georgia 30322, USA
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Kim HM, Shin DR, Yoo OJ, Lee H, Lee JO. Crystal structure of Drosophila angiotensin I-converting enzyme bound to captopril and lisinopril. FEBS Lett 2003; 538:65-70. [PMID: 12633854 DOI: 10.1016/s0014-5793(03)00128-5] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Angiotensin I-converting enzymes (ACEs) are zinc metallopeptidases that cleave carboxy-terminal dipeptides from short peptide hormones. We have determined the crystal structures of AnCE, a Drosophila homolog of ACE, with and without bound inhibitors to 2.4 A resolution. AnCE contains a large internal channel encompassing the entire protein molecule. This substrate-binding channel is composed of two chambers, reminiscent of a peanut shell. The inhibitor and zinc-binding sites are located in the narrow bottleneck connecting the two chambers. The substrate and inhibitor specificity of AnCE appears to be determined by extensive hydrogen-bonding networks and ionic interactions in the active site channel. The catalytically important zinc ion is coordinated by the conserved Glu395 and histidine residues from a HExxH motif.
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Affiliation(s)
- Ho Min Kim
- Department of Biological Science, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Daejeon, South Korea
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Ball BA, Gravance CG, Wessel MT, Sabeur K. Activity of angiotensin-converting enzyme (ACE) in reproductive tissues of the stallion and effects of angiotensin II on sperm motility. Theriogenology 2003; 59:901-14. [PMID: 12517392 DOI: 10.1016/s0093-691x(02)01127-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A testis-specific isoform of angiotensin-converting enzyme (ACE) has been identified in a number of mammalian species. The purpose of this study was to characterize the activity of ACE in equine spermatozoa, seminal plasma, and testis. Activity of ACE was determined in seminal plasma, ejaculated and epididymal spermatozoa from mature stallions as well as from pre- and postpubertal testis. The effect of addition of angiotensin II on equine sperm motility was also evaluated. The activity of ACE in detergent extracted sperm plasma membrane was approximately 13-fold higher than that detected in seminal plasma (93.7 mU/mg versus 7.0 mU/mg protein, respectively). Activity of ACE in equine testis was significantly higher in postpubertal than in prepubertal males (3.0 mU/mg versus 0.4 mU/mg protein, respectively), and ACE activity was reduced (P<0.001) in a dose-dependent fashion by the addition of captopril. The effect of angiotensin II on sperm motility was evaluated by computer-assisted semen analysis in sperm incubated with angiotensin II (0, 1, 10, 100 nM) at 38.5 degrees C. There was no significant effect of angiotensin II on the percent motile sperm; however, there was a significant main effect of angiotensin II (P<0.01) on the kinematic parameters beat cross frequency (BCF), average path velocity (VAP), and curvilinear velocity (VCL), respectively. In addition, there were significant stallionxconcentration interactions for amplitude lateral movement (ALH), BCF, linearity (LIN), straightness (STR), and VCL. This study demonstrates that ACE activity is present in sperm membrane from ejaculated and epididymal spermatozoa and in postpubertal testis. Further studies are required to determine the role of this testis-specific enzyme.
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Affiliation(s)
- B A Ball
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, One Shields Avenue, Davis, CA 95616-8743, USA.
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Pauls K, Metzger R, Steger K, Klonisch T, Danilov S, Franke FE. Isoforms of angiotensin I-converting enzyme in the development and differentiation of human testis and epididymis. Andrologia 2003; 35:32-43. [PMID: 12558527 DOI: 10.1046/j.1439-0272.2003.00535.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Angiotensin I-converting enzyme (ACE; CD143, Kininase II, EC 3.4.15.1) is known to be crucial for male fertility in animal models. We therefore studied its testicular (tACE) and somatic (sACE) isoforms in foetal and adult human testis and epididymis using monoclonal antibodies and cRNA probes. During spermatogenesis, tACE was found only in differentiating germ cells and was the only isoform within the seminiferous tubules of adult men. Although tACE mRNA was present in spermatocytes, tACE protein was initially found in post-meiotic step 3 spermatids and increased markedly during further differentiation. The enzyme was strictly confined to the adluminal membrane site of elongating spermatids and was localized at the neck and midpiece region of released and ejaculated spermatozoa. In contrast, sACE was expressed heterogeneously in Leydig cells and endothelial cells of the testicular interstitium, and homogeneously along the luminal surface of epithelial cells lining the ductuli efferents, corpus and cauda of epididymis, and vas deferens. The cell- and site-restricted pattern of sACE corresponded to that found in foetal tissues except an additional and transient expression of sACE in foetal germ cells and foetal Sertoli cells. Our study documents for the first time in humans the regulation and unique cellular distribution of ACE isoforms during the ontogenesis of the lower male genital tract.
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Affiliation(s)
- K Pauls
- Department of Internal Medicine, Ludwig Maximilians University, Munich, Germany
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Andujar-Sánchez M, Cámara-Artigas A, Jara-Pérez V. Purification of angiotensin I converting enzyme from pig lung using concanavalin-A sepharose chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2003; 783:247-52. [PMID: 12450545 DOI: 10.1016/s1570-0232(02)00663-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Angiotensin I converting enzyme (ACE) plays a major role in blood pressure regulation, catalyzing the conversion of angiotensin I to the vasoconstrictor angiotensin II. In this report we describe a two-step affinity chromatography method for preparative purification of ACE from pig lung using Concanavalin-A Sepharose 4B and affinity chromatography on Lisinopril Sepharose 6B. The same purification scheme was used to obtain Cobalt-ACE, where zinc ion located at the active site is replaced by cobalt. Cobalt-ACE visible spectrum shows a characteristic broad peak from 500 to 600 nm. The shape and maximum absorptivity of this peak changes in presence of ACE inhibitors that bind at the catalytic site.
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Affiliation(s)
- M Andujar-Sánchez
- Dpto. Química Física, Bioquímica y Qui;mica Inorgánica, Universidad de Almería, Carretera Sacramento s/n, 04120, Almería, Spain.
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Balyasnikova IV, Metzger R, Franke FE, Danilov SM. Monoclonal antibodies to denatured human ACE (CD 143), broad species specificity, reactivity on paraffin sections, and detection of subtle conformational changes in the C-terminal domain of ACE. TISSUE ANTIGENS 2003; 61:49-62. [PMID: 12622775 DOI: 10.1034/j.1399-0039.2003.610104.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Two new mouse monoclonal antibodies (mAbs) were generated to denatured human angiotensin-converting enzyme (ACE, CD143). The clones 2E2 and 3C5, each of the IgG1 kappa chain isotype, detect ACE with high sensitivity, respectively, at 20 ng and 2 ng of protein per lane in Western blotting. They both recognize different epitopes on the C-domain of ACE located between amino acid residues 740 and 992. In formalin-fixed and paraffin-embedded human tissues, immunohistochemistry revealed all known expression sites of ACE, e.g. the epithelial brush borders of proximal kidney tubules, epithelial cells of epididymis, endothelial cells, activated macrophages as well as germ cells during spermatogenesis. In contrast to other mAbs to denatured human ACE, mAbs 2E2 and 3C5 demonstrate cross-reactivity with a broad spectrum of animal species such as monkey, rat, rabbit, cattle, dog, cat, and guinea pig. In addition, mAb 2E2 recognized mouse ACE in Western blotting and on paraffin sections. Our findings suggest that mAbs 2E2 and 3C5 are useful for identifying even subtle changes in ACE conformation resulting from denaturation. These mAbs are also sensitive tools for the detection of minimal amounts of ACE in biological fluids and tissues using proteomics approaches. Their reactivity in routinely processed tissues of various species may prove useful for correlation of ACE expression in animal models to human diseases.
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Affiliation(s)
- I V Balyasnikova
- Department of Anesthesiology, University of Illinois at Chicago, IL 60612, USA
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