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Mouchtouri ET, Konstantinou T, Lekkas P, Lianopoulou A, Kotsaridou Z, Mourouzis I, Pantos C, Kolettis TM. Endothelin Modulates Rhythm Disturbances and Autonomic Responses to Acute Emotional Stress in Rats. BIOLOGY 2023; 12:1401. [PMID: 37998000 PMCID: PMC10669295 DOI: 10.3390/biology12111401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/11/2023] [Accepted: 11/03/2023] [Indexed: 11/25/2023]
Abstract
The ubiquitous peptide endothelin is currently under investigation as a modulatory factor of autonomic responses to acute emotional stress. Baseline plasma levels of endothelin alter blood pressure responses, but it remains unclear whether autonomic activity and arrhythmogenesis (i.e., brady- or tachyarrhythmias) are affected. We recorded sympathetic and vagal indices (derived from heart rate variability analysis), rhythm disturbances, voluntary motion, and systolic blood pressure after acute emotional stress in conscious rats with implanted telemetry devices. Two strains were compared, namely wild-type and ETB-deficient rats, the latter displaying elevated plasma endothelin. No differences in heart rate or blood pressure were evident, but sympathetic responses were blunted in ETB-deficient rats, contrasting prompt activation in wild-type rats. Vagal withdrawal was observed in both strains at the onset of stress, but vagal activity was subsequently restored in ETB-deficient rats, accompanied by low voluntary motion during recovery. Reflecting such distinct autonomic patterns, frequent premature ventricular contractions were recorded in wild-type rats, as opposed to sinus pauses in ETB-deficient rats. Thus, chronically elevated plasma endothelin levels blunt autonomic responses to acute emotional stress, resulting in vagal dominance and bradyarrhythmias. Our study provides further insights into the pathophysiology of stress-induced tachyarrhythmias and syncope.
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Affiliation(s)
- Eleni-Taxiarchia Mouchtouri
- Department of Cardiology, Medical School, University of Ioannina, 45500 Ioannina, Greece; (E.-T.M.); (T.K.)
- Cardiovascular Research Institute, 45500 Ioannina, Greece;
| | - Thomas Konstantinou
- Department of Cardiology, Medical School, University of Ioannina, 45500 Ioannina, Greece; (E.-T.M.); (T.K.)
- Cardiovascular Research Institute, 45500 Ioannina, Greece;
| | | | - Alexandra Lianopoulou
- School of Applied Biology and Biotechnology, Agricultural University of Athens, 10447 Athens, Greece; (A.L.); (Z.K.)
| | - Zoi Kotsaridou
- School of Applied Biology and Biotechnology, Agricultural University of Athens, 10447 Athens, Greece; (A.L.); (Z.K.)
| | - Iordanis Mourouzis
- Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece; (I.M.); (C.P.)
| | - Constantinos Pantos
- Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece; (I.M.); (C.P.)
| | - Theofilos M. Kolettis
- Department of Cardiology, Medical School, University of Ioannina, 45500 Ioannina, Greece; (E.-T.M.); (T.K.)
- Cardiovascular Research Institute, 45500 Ioannina, Greece;
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Mazzotta E, Grants I, Villalobos-Hernandez E, Chaudhuri S, McClain JL, Seguella L, Kendig DM, Blakeney BA, Murthy SK, Schneider R, Leven P, Wehner S, Harzman A, Grider JR, Gulbransen BD, Christofi FL. BQ788 reveals glial ET B receptor modulation of neuronal cholinergic and nitrergic pathways to inhibit intestinal motility: Linked to postoperative ileus. Br J Pharmacol 2023; 180:2550-2576. [PMID: 37198101 PMCID: PMC11085045 DOI: 10.1111/bph.16145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 05/03/2023] [Accepted: 05/05/2023] [Indexed: 05/19/2023] Open
Abstract
BACKGROUND AND PURPOSE ET-1 signalling modulates intestinal motility and inflammation, but the role of ET-1/ETB receptor signalling is poorly understood. Enteric glia modulate normal motility and inflammation. We investigated whether glial ETB signalling regulates neural-motor pathways of intestinal motility and inflammation. EXPERIMENTAL APPROACH We studied ETB signalling using: ETB drugs (ET-1, SaTX, BQ788), activity-dependent stimulation of neurons (high K+ -depolarization, EFS), gliotoxins, Tg (Ednrb-EGFP)EP59Gsat/Mmucd mice, cell-specific mRNA in Sox10CreERT2 ;Rpl22-HAflx or ChATCre ;Rpl22-HAflx mice, Sox10CreERT2 ::GCaMP5g-tdT, Wnt1Cre2 ::GCaMP5g-tdT mice, muscle tension recordings, fluid-induced peristalsis, ET-1 expression, qPCR, western blots, 3-D LSM-immunofluorescence co-labelling studies in LMMP-CM and a postoperative ileus (POI) model of intestinal inflammation. KEY RESULTS In the muscularis externa ETB receptor is expressed exclusively in glia. ET-1 is expressed in RiboTag (ChAT)-neurons, isolated ganglia and intra-ganglionic varicose-nerve fibres co-labelled with peripherin or SP. ET-1 release provides activity-dependent glial ETB receptor modulation of Ca2+ waves in neural evoked glial responses. BQ788 reveals amplification of glial and neuronal Ca2+ responses and excitatory cholinergic contractions, sensitive to L-NAME. Gliotoxins disrupt SaTX-induced glial-Ca2+ waves and prevent BQ788 amplification of contractions. The ETB receptor is linked to inhibition of contractions and peristalsis. Inflammation causes glial ETB up-regulation, SaTX-hypersensitivity and glial amplification of ETB signalling. In vivo BQ788 (i.p., 1 mg·kg-1 ) attenuates intestinal inflammation in POI. CONCLUSION AND IMPLICATIONS Enteric glial ET-1/ETB signalling provides dual modulation of neural-motor circuits to inhibit motility. It inhibits excitatory cholinergic and stimulates inhibitory nitrergic motor pathways. Amplification of glial ETB receptors is linked to muscularis externa inflammation and possibly pathogenic mechanisms of POI.
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Affiliation(s)
- Elvio Mazzotta
- Department of Anesthesiology, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| | - Iveta Grants
- Department of Anesthesiology, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| | | | - Samhita Chaudhuri
- Department of Anesthesiology, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| | - Jonathon L McClain
- Department of Physiology, Michigan State University, East Lansing, Michigan, USA
| | - Luisa Seguella
- Department of Physiology and Pharmacology "V. Erspamer", Sapienza University of Rome, Rome, Italy
| | - Derek M Kendig
- Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Bryan A Blakeney
- Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Srinivasa K Murthy
- Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia, USA
| | | | - Patrick Leven
- Department of Surgery, University of Bonn, Bonn, Germany
| | - Sven Wehner
- Department of Surgery, University of Bonn, Bonn, Germany
| | - Alan Harzman
- Department of GI Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| | - John R Grider
- Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Brian D Gulbransen
- Department of Physiology, Michigan State University, East Lansing, Michigan, USA
| | - Fedias L Christofi
- Department of Anesthesiology, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
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3
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Becker BK, Grady CM, Markl AE, Torres Rodriguez AA, Pollock DM. Elevated renal afferent nerve activity in a rat model of endothelin B receptor deficiency. Am J Physiol Renal Physiol 2023; 325:F235-F247. [PMID: 37348026 PMCID: PMC10396274 DOI: 10.1152/ajprenal.00064.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 06/13/2023] [Accepted: 06/21/2023] [Indexed: 06/24/2023] Open
Abstract
Renal nerves have been an attractive target for interventions aimed at lowering blood pressure; however, the specific roles of renal afferent (sensory) versus efferent sympathetic nerves in mediating hypertension are poorly characterized. A number of studies have suggested that a sympathoexcitatory signal conveyed by renal afferents elicits increases in blood pressure, whereas other studies identified sympathoinhibitory afferent pathways. These sympathoinhibitory pathways have been identified as protective against salt-sensitive increases in blood pressure through endothelin B (ETB) receptor activation. We hypothesized that ETB-deficient (ETB-def) rats, which are devoid of functional ETB receptors except in adrenergic tissues, lack appropriate sympathoinhibition and have lower renal afferent nerve activity following a high-salt diet compared with transgenic controls. We found that isolated renal pelvises from high salt-fed ETB-def animals lack a response to a physiological stimulus, prostaglandin E2, compared with transgenic controls but respond equally to a noxious stimulus, capsaicin. Surprisingly, we observed elevated renal afferent nerve activity in intact ETB-def rats compared with transgenic controls under both normal- and high-salt diets. ETB-def rats have been previously shown to have heightened global sympathetic tone, and we also observed higher total renal sympathetic nerve activity in ETB-def rats compared with transgenic controls under both normal- and high-salt diets. These data indicate that ETB receptors are integral mediators of the sympathoinhibitory renal afferent reflex (renorenal reflex), and, in a genetic rat model of ETB deficiency, the preponderance of sympathoexcitatory renal afferent nerve activity prevails and may contribute to hypertension.NEW & NOTEWORTHY Here, we found that endothelin B receptors are an important contributor to renal afferent nerve responsiveness to a high-salt diet. Rats lacking endothelin B receptors have increased afferent nerve activity that is not responsive to a high-salt diet.
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Affiliation(s)
- Bryan K Becker
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
| | - Caroline M Grady
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
| | - Alexa E Markl
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
| | - Alfredo A Torres Rodriguez
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
| | - David M Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States
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Mueller JL, Goldstein AM. The science of Hirschsprung disease: What we know and where we are headed. Semin Pediatr Surg 2022; 31:151157. [PMID: 35690468 DOI: 10.1016/j.sempedsurg.2022.151157] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The enteric nervous system (ENS) is a rich network of neurons and glial cells that comprise the gastrointestinal tract's intrinsic nervous system and are responsible for controlling numerous complex functions, including digestion, transit, secretion, barrier function, and maintenance of a healthy microbiome. Development of a functional ENS relies on the coordinated interaction between enteric neural crest-derived cells and their environment as the neural crest-derived cells migrate rostrocaudally along the embryonic gut mesenchyme. Congenital or acquired disruption of ENS development leads to various neurointestinal diseases. Hirschsprung disease is a congenital neurocristopathy, a disease of the neural crest. It is characterized by a variable length of distal colonic aganglionosis due to a failure in enteric neural crest-derived cell proliferation, migration, differentiation, and/or survival. In this review, we will review the science of Hirschsprung disease, targeting an audience of pediatric surgeons. We will discuss the basic biology of normal ENS development, as well as what goes awry in ENS development in Hirschsprung disease. We will review animal models that have been integral to studying this disease, as well as current hot topics and future research, including genetic risk profiling, stem cell therapy, non-invasive diagnostic techniques, single-cell sequencing techniques, and genotype-phenotype correlation.
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Affiliation(s)
- Jessica L Mueller
- Department of Pediatric Surgery, Massachusetts General Hospital, Massachusetts General Hospital for Children, Harvard Medical School, 55 Fruit St., WRN 1151, Boston, MA 02114, United States
| | - Allan M Goldstein
- Department of Pediatric Surgery, Massachusetts General Hospital, Massachusetts General Hospital for Children, Harvard Medical School, 55 Fruit St., WRN 1151, Boston, MA 02114, United States.
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Chen KC, Song ZM, Croaker GD. Brain size reductions associated with endothelin B receptor mutation, a cause of Hirschsprung's disease. BMC Neurosci 2021; 22:42. [PMID: 34147087 PMCID: PMC8214790 DOI: 10.1186/s12868-021-00646-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 06/08/2021] [Indexed: 01/03/2023] Open
Abstract
Background ETB has been reported to regulate neurogenesis and vasoregulation in foetal development. Its dysfunction was known to cause HSCR, an aganglionic colonic disorder with syndromic forms reported to associate with both small heads and developmental delay. We therefore asked, "is CNS maldevelopment a more general feature of ETB mutation?" To investigate, we reviewed the micro-CT scans of an ETB−/− model animal, sl/sl rat, and quantitatively evaluated the structural changes of its brain constituents. Methods Eleven neonatal rats generated from ETB+/− cross breeding were sacrificed. Micro-CT scans were completed following 1.5% iodine-staining protocols. All scans were reviewed for morphological changes. Selected organs were segmented semi-automatically post-NLM filtering: TBr, T-CC, T-CP, OB, Med, Cer, Pit, and S&I Col. Volumetric measurements were made using Drishti rendering software. Rat genotyping was completed following analysis. Statistical comparisons on organ volume, organ growth rate, and organ volume/bodyweight ratios were made between sl/sl and the control groups based on autosomal recessive inheritance. One-way ANOVA was also performed to evaluate potential dose-dependent effect. Results sl/sl rat has 16.32% lower body weight with 3.53% lower growth rate than the control group. Gross intracranial morphology was preserved in sl/sl rats. However, significant volumetric reduction of 20.33% was detected in TBr; similar reductions were extended to the measurements of T-CC, T-CP, OB, Med, and Pit. Consistently, lower brain and selected constituent growth rates were detected in sl/sl rat, ranging from 6.21% to 11.51% reduction. Lower organ volume/bodyweight ratio was detected in sl/sl rats, reflecting disproportional neural changes with respect to body size. No consistent linear relationships exist between ETB copies and intracranial organ size or growth rates. Conclusion Although ETB−/− mutant has a normal CNS morphology, significant size reductions in brain and constituents were detected. These structural changes likely arise from a combination of factors secondary to dysfunctional ET-1/ET-3/ETB signalling, including global growth impairment from HSCR-induced malnutrition and dysregulations in the neurogenesis, angiogenesis, and cerebral vascular control. These changes have important clinical implications, such as autonomic dysfunction or intellectual delay. Although further human study is warranted, our study suggested comprehensive managements are required for HSCR patients, at least in ETB−/− subtype. Supplementary Information The online version contains supplementary material available at 10.1186/s12868-021-00646-z.
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Affiliation(s)
- Ko-Chin Chen
- Medical School, Australian National University, Canberra, ACT, 2601, Australia.
| | - Zan-Min Song
- Medical School, Australian National University, Canberra, ACT, 2601, Australia
| | - Geoffrey D Croaker
- Medical School, Australian National University, Canberra, ACT, 2601, Australia.,The Canberra Hospital, Yamba Drive, Garran, ACT, 2605, Australia
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Becker BK, Johnston JG, Young CM, Torres Rodriguez AA, Jin C, Pollock DM. Endothelin B receptors impair baroreflex function and increase blood pressure variability during high salt diet. Auton Neurosci 2021; 232:102796. [PMID: 33798837 PMCID: PMC8040376 DOI: 10.1016/j.autneu.2021.102796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 03/01/2021] [Accepted: 03/04/2021] [Indexed: 10/21/2022]
Abstract
Baroreflex function is an integral component maintaining consistent blood pressure. Hypertension is often associated with baroreflex dysfunction, and environmental risk factors such as high salt diet exacerbate hypertension in subjects with baroreflex dysfunction. However, the interactions between high salt diet, baroreflex dysfunction, and hypertension are incompletely understood. The endothelin system is another potent mediator of blood pressure control especially in response to a high salt diet. We hypothesized that the endothelin B (ETB) receptor activation on adrenergic nerves decreases baroreflex sensitivity. We utilized male ETB receptor deficient (ETB-def) rats that express functional ETB receptors only on adrenergic nerves and transgenic (TG) controls to evaluate baroreflex function during normal (0.49% NaCl) and high (4.0% NaCl) salt diets. In conscious rats equipped with telemetry, ETB-def rats had an increased lability of systolic blood pressure (SBP) compared to TG controls as indicated by higher standard deviation (SD) of SBP under both normal (10.2 ± 0.6 vs. 12.4 ± 0.9 mmHg, respectively, p = 0.0001) and high (11.7 ± 0.6 vs. 16.1 ± 1.0 mmHg, p = 0.0001) salt diets. In anesthetized preparations, ETB-def rats displayed reduced heart rate (p genotype = 0.0167) and renal sympathetic nerve (p genotype = 0.0022) baroreflex sensitivity. We then gave male Sprague-Dawley rats the selective ETB receptor antagonist, A-192621 (10 mg/kg/day), to block ETB receptors. Following ETB receptor antagonism, even though SBP increased (131 ± 7 before vs. 152 ± 8 mmHg after, p < 0.0001), the lability (standard deviation) of SBP decreased (9.3 ± 2.0 vs. 7.1 ± 1.1 mmHg, p = 0.0155). These data support our hypothesis that ETB receptors on adrenergic nerves contribute to baroreflex dysfunction.
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Affiliation(s)
- Bryan K Becker
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35294, United States of America.
| | - Jermaine G Johnston
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35294, United States of America
| | - Carolyn M Young
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35294, United States of America
| | - Alfredo A Torres Rodriguez
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35294, United States of America
| | - Chunhua Jin
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35294, United States of America
| | - David M Pollock
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35294, United States of America
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Gohar EY, Pollock DM. Functional Interaction of Endothelin Receptors in Mediating Natriuresis Evoked by G Protein-Coupled Estrogen Receptor 1. J Pharmacol Exp Ther 2020; 376:98-105. [PMID: 33127751 PMCID: PMC7788354 DOI: 10.1124/jpet.120.000322] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 10/26/2020] [Indexed: 01/14/2023] Open
Abstract
The G protein–coupled estrogen receptor 1 (GPER1) mediates rapid estrogenic signaling. We recently reported that activation of GPER1 in the renal medulla evokes endothelin-1–dependent natriuresis in female, but not male, rats. However, the involvement of the ET receptors, ETA and ETB, underlying GPER1 natriuretic action remain unclear. In this study, we used genetic and pharmacologic methods to identify the contributions of ETA and ETB in mediating this female-specific natriuretic effect of renal medullary GPER1. Infusion of the GPER1-selective agonist G1 (5 pmol/kg per minute) into the renal medulla for 40 minutes increased Na+ excretion and urine flow in anesthetized female ETB-deficient (ETB def) rats and littermate controls but did not affect blood pressure or urinary K+ excretion in either group. Pretreatment with the selective ETA inhibitor ABT-627 (5 mg/kg, intravenous) abolished G1-induced natriuresis in ETB def rats. To further isolate the effects of inhibiting either receptor alone, we conducted the same experiments in anesthetized female Sprague-Dawley (SD) rats pretreated or not with ABT-627 and/or the selective ETB inhibitor A-192621 (10 mg/kg, intravenous). Neither antagonism of ETA nor antagonism of ETB receptor alone affected the G1-induced increase in Na+ excretion and urine flow in SD rats. However, simultaneous antagonism of both receptors completely abolished these effects. These data suggest that ETA and ETB receptors can mediate the natriuretic and diuretic response to renal medullary GPER1 activation in female rats.
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Affiliation(s)
- Eman Y Gohar
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Alabama (E.Y.G, D.M.P); and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt (E.Y.G)
| | - David M Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Alabama (E.Y.G, D.M.P); and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt (E.Y.G)
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8
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Ibrahimi Disha S, Furlani B, Drevensek G, Plut A, Yanagisawa M, Hudoklin S, Prodan Žitnik I, Marc J, Drevensek M. The role of endothelin B receptor in bone modelling during orthodontic tooth movement: a study on ET B knockout rats. Sci Rep 2020; 10:14226. [PMID: 32848199 PMCID: PMC7450079 DOI: 10.1038/s41598-020-71159-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 08/10/2020] [Indexed: 02/06/2023] Open
Abstract
The endothelin system has an important role in bone modelling during orthodontic tooth movement (OTM); however, little is known about the involvement of endothelin B receptors (ETB) in this process. The aim of this study was to evaluate the role of ETB in bone modelling during OTM using ETB knockout rats (ETB-KO). Thirty-two male rats were divided into 4 groups (n = 8 per group): the ETB-KO appliance group, ETB-KO control group, wild type (ETB-WT) appliance group, and ETB-WT control group. The appliance consisted of a super-elastic closed-coil spring placed between the first and second left maxillary molar and the incisors. Tooth movement was measured on days 0 and 35, and maxillary alveolar bone volume, osteoblast, and osteoclast volume were determined histomorphometrically on day 35 of OTM. Next, we determined the serum endothelin 1 (ET-1) level and gene expression levels of the osteoclast activity marker cathepsin K and osteoblast activity markers osteocalcin and dentin matrix acidic phosphoprotein 1 (DMP1) on day 35. The ETB-KO appliance group showed significantly lower osteoblast activity, diminished alveolar bone volume and less OTM than the ETB-WT appliance group. Our results showed that ETB is involved in bone modelling in the late stage of OTM.
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Affiliation(s)
- S Ibrahimi Disha
- Department of Orthodontics, Faculty of Medicine, University of Ljubljana, Hrvatski trg 6, 1000, Ljubljana, Slovenia
| | - B Furlani
- Institute of Pharmacology and Experimental Toxicology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - G Drevensek
- Institute of Pharmacology and Experimental Toxicology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - A Plut
- Department of Orthodontics, University Medical Center Ljubljana, Ljubljana, Slovenia
| | - M Yanagisawa
- International Institute for Integrative Sleep Medicine, University of Tsukuba, Tsukuba, Japan
| | - S Hudoklin
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - I Prodan Žitnik
- Department of Clinical Biochemistry, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - J Marc
- Department of Clinical Biochemistry, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - M Drevensek
- Department of Orthodontics, Faculty of Medicine, University of Ljubljana, Hrvatski trg 6, 1000, Ljubljana, Slovenia. .,Department of Orthodontics, University Medical Center Ljubljana, Ljubljana, Slovenia.
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9
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Bhave S, Arciero E, Baker C, Ho WL, Stavely R, Goldstein AM, Hotta R. Enteric neuronal cell therapy reverses architectural changes in a novel diphtheria toxin-mediated model of colonic aganglionosis. Sci Rep 2019; 9:18756. [PMID: 31822721 PMCID: PMC6904570 DOI: 10.1038/s41598-019-55128-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 11/19/2019] [Indexed: 01/14/2023] Open
Abstract
Hirschsprung disease (HSCR) is characterized by absence of the enteric nervous system (ENS) in the distal bowel. Despite removal of the aganglionic segment, gastrointestinal (GI) problems persist. Cell therapy offers potential treatment but use of genetic models is limited by their poor survival. We have developed a novel model of aganglionosis in which enteric neural crest-derived cells (ENCDCs) express diphtheria toxin (DT) receptor. Local DT injection into the colon wall results in focal, specific, and sustained ENS ablation without altering GI transit or colonic contractility, allowing improved survival over other aganglionosis models. Focal ENS ablation leads to increased smooth muscle and mucosal thickness, and localized inflammation. Transplantation of ENCDCs into this region leads to engraftment, migration, and differentiation of enteric neurons and glial cells, with restoration of normal architecture of the colonic epithelium and muscle, reduction in inflammation, and improved survival.
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Affiliation(s)
- Sukhada Bhave
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Emily Arciero
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Corey Baker
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Wing Lam Ho
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Rhian Stavely
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Allan M Goldstein
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Ryo Hotta
- Department of Pediatric Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
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10
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Bondurand N, Dufour S, Pingault V. News from the endothelin-3/EDNRB signaling pathway: Role during enteric nervous system development and involvement in neural crest-associated disorders. Dev Biol 2018; 444 Suppl 1:S156-S169. [PMID: 30171849 DOI: 10.1016/j.ydbio.2018.08.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 08/27/2018] [Accepted: 08/27/2018] [Indexed: 01/08/2023]
Abstract
The endothelin system is a vertebrate-specific innovation with important roles in regulating the cardiovascular system and renal and pulmonary processes, as well as the development of the vertebrate-specific neural crest cell population and its derivatives. This system is comprised of three structurally similar 21-amino acid peptides that bind and activate two G-protein coupled receptors. In 1994, knockouts of the Edn3 and Ednrb genes revealed their crucial function during development of the enteric nervous system and melanocytes, two neural-crest derivatives. Since then, human and mouse genetics, combined with cellular and developmental studies, have helped to unravel the role of this signaling pathway during development and adulthood. In this review, we will summarize the known functions of the EDN3/EDNRB pathway during neural crest development, with a specific focus on recent scientific advances, and the enteric nervous system in normal and pathological conditions.
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Affiliation(s)
- Nadege Bondurand
- Laboratory of Embryology and Genetics of Congenital Malformations, INSERM U1163, Institut Imagine, Paris, France; Paris Descartes-Sorbonne Paris Cité University, Institut Imagine, Paris, France.
| | - Sylvie Dufour
- INSERM, U955, Equipe 06, Créteil 94000, France; Université Paris Est, Faculté de Médecine, Créteil 94000, France
| | - Veronique Pingault
- Laboratory of Embryology and Genetics of Congenital Malformations, INSERM U1163, Institut Imagine, Paris, France; Paris Descartes-Sorbonne Paris Cité University, Institut Imagine, Paris, France; Service de Génétique Moléculaire, Hôpital Necker-Enfants Malades, Assistance Publique - Hôpitaux de Paris, Paris, France
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11
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Stobdan T, Zhou D, Williams AT, Cabrales P, Haddad GG. Cardiac-specific knockout and pharmacological inhibition of Endothelin receptor type B lead to cardiac resistance to extreme hypoxia. J Mol Med (Berl) 2018; 96:975-982. [PMID: 30069745 DOI: 10.1007/s00109-018-1673-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 07/11/2018] [Accepted: 07/23/2018] [Indexed: 11/27/2022]
Abstract
Oxygen plays a central role in cardiac energy metabolism. At high altitude where the ambient oxygen level is low, we found EDNRB is associated with human hypoxia adaptation. Our subsequent study in global heterozygous knockout mice (Ednrb-/+) revealed that cardiac function was conserved in these mice when exposed to extreme hypoxia. The major goal of this study was (i) to determine the functional role of cardiomyocyte EdnrB in maintaining cardiac function under hypoxic stress and (ii) to validate the phenotypes we detected in Ednrb-/+ mice using EDNRB blockers. Unlike the global knockouts, cardiac-specific heterozygote (EdnrBflox/+) and homozygote (EdnrBflox/flox) EdnrB knockout mice were phenotypically normal. When treated with graded low levels of oxygen (10% and 5% O2), both EdnrBflox/+ and EdnrBflox/flox were hypoxia tolerant. The cardiac indexes at 10% and 5% O2 for EdnrBflox/+ were significantly higher and lactate levels were significantly lower when compared to the cre-negative controls (P < 0.05). Simultaneously, mice treated with BQ-788 (EDNRB-specific blocker) had a significantly higher cardiac index (P < 0.005) and significantly lower lactate levels (P < 0.0001) than in control mice. A similar result was obtained with mice treated with Bosentan (non-specific). These data indicate that a lower level or complete lack of EdnrB in the cardiomyocytes significantly improves cardiac performance under extreme hypoxia, a novel role of cardiomyocyte EdnrB in the regulation of cardiac function. Furthermore, this rescue under extreme hypoxia can also be achieved using EDNRB-specific pharmacological agents, e.g., BQ-788. This systematically confirms, both genetically and pharmacologically, the protective role of a lower EDNRB under extreme hypoxia stress. KEY MESSAGES Under normal condition, cardiomyocytes-specific EdnrB knockout mice, both heterozygote and homozygote, are phenotypically normal. Under hypoxic condition, a lower level or complete deletion of cardiomyocyte EdnrB conserves cardiac function by maintaining high cardiac index. Similarly, mice treated with both specific (BQ-788) and non-specific (Bosentan) EDNRB blockers are tolerant to hypoxia by maintaining better cardiac function. The oxygen perfusion under extreme hypoxia is better in the mice with lower EDNRB, as depicted by lower lactate level at 5% oxygen. Our current study systematically confirms, both genetically and pharmacologically, the protective role of a lower EDNRB under extreme hypoxia stress. Overall, it supports our hypothesis that studies on human hypoxia adaptation provide new insight to common disease pathogenesis and treatments.
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Affiliation(s)
- Tsering Stobdan
- Division of Respiratory Medicine, Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, MC 0735, La Jolla, CA, 92093, USA
| | - Dan Zhou
- Division of Respiratory Medicine, Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, MC 0735, La Jolla, CA, 92093, USA
| | - Alexander T Williams
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Pedro Cabrales
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Gabriel G Haddad
- Division of Respiratory Medicine, Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, MC 0735, La Jolla, CA, 92093, USA. .,Department of Neurosciences, University of California, San Diego, La Jolla, CA, 92093, USA. .,Rady Children's Hospital, San Diego, CA, 92123, USA.
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12
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Fujiwara N, Miyahara K, Nakazawa-Tanaka N, Akazawa C, Yamataka A. Increased expression of Semaphorin 3A in the endothelin receptor-B null mouse model of Hirschsprung disease. J Pediatr Surg 2018; 53:326-329. [PMID: 29224790 DOI: 10.1016/j.jpedsurg.2017.11.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 11/08/2017] [Indexed: 12/20/2022]
Abstract
PURPOSE Semaphorins are guidance cues for developing neurons, implicated in the determination of the migratory pathway of neural crest-derived neural precursors during enteric nervous system development. Recently, it has been reported that Semaphorin 3A (SEMA3A) expression is up-regulated in the aganglionic colon in Hirschsprung disease (HD) patients, suggesting that increased SEMA3A expression may be a risk factor for HD. Thus, the aim of our study was to determine the expression of SEMA3A using Sox10-Venus mice gut. METHODS We harvested the gut on postnatal day 2 (P2). SOX10-Venus+/EDNRB-/- mice were compared with SOX10-Venus+/EDNRB+/+ mice as controls. QRT-PCR was performed to determine gene expression of SEMA3A (n=8). Fluorescent immunohistochemistry was performed to assess protein distribution. RESULTS On P2, gene expression levels of SEMA3A were significantly increased in the HD group compared to controls in the proximal and distal colon (p<0.05). Laser scanning microscopy revealed SEMA3A expression was localized within the submucosa and muscle layer of the gut in both HD and controls. In HD, SEMA3A was highly expressed in the proximal and distal colon. CONCLUSIONS In the present study, we demonstrated that SEMA3A expression is increased in the EDNRB-/- HD model on P2, suggesting that SEMA3A may interfere with ENCC migration, resulting in an absence of enteric neurons.
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Affiliation(s)
- Naho Fujiwara
- Department of Pediatric Surgery, Juntendo University School of Medicine.
| | - Katsumi Miyahara
- Department of Pediatric Surgery, Juntendo University School of Medicine
| | - Nana Nakazawa-Tanaka
- Department of Pediatric Surgery, Juntendo University School of Medicine; Department of Pediatric Surgery, Juntendo Nerima Hospital
| | - Chihiro Akazawa
- Department of Biochemistry and Biophysics, Graduate School of Health Care Science, Tokyo Medical and Dental University
| | - Atsuyuki Yamataka
- Department of Pediatric Surgery, Juntendo University School of Medicine
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13
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Li HB, Jin XQ, Jin X, Guo ZH, Ding XH, Wang Q, Liu RZ. BMP4 knockdown of NCSCs leads to aganglionosis in the middle embryonic stage. Mol Med Rep 2018; 17:5423-5427. [PMID: 29393463 DOI: 10.3892/mmr.2018.8519] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Accepted: 12/14/2017] [Indexed: 11/06/2022] Open
Abstract
Transplacental bone morphogenetic protein (BMP)4 RNA interference (RNAi) is a technique used to knockdown genes in embryos. BMP4 are essential for the development of nervous system in the differentiation of neural crest stem cells (NCSCs). The failure of differentiation and migration of NCSCs may lead to aganglionosis. In the present study, pregnant mice were divided into three groups: Ringer's group, pSES group and RNAi‑BMP4 group. In order to silence the BMP4 gene in the first generation (F1), 11.5 day pregnant mice were injected with the small interfering RNA BMP4 plasmid, pSES or Ringer's solution via the tail vein. Semi‑quantitative reverse transcriptase‑polymerase chain reaction (RT‑PCR)and western blotting were employed to ensure the downregulation of BMP4. Finally, X‑rays were performed following a barium enema. Aganglionosis was diagnosed by general anatomy and immunohistochemistry. Compared with the control group, transplacental RNAi was able to downregulate the BMP4‑Smad4 of 11.5 day embryos, as determined by semi‑quantitative RT‑PCR and western blotting. The megacolons of the mice were demonstrated by X‑ray and confirmed by general anatomy. Aganglionosis of colonic mucosa and submucosa were diagnosed by pathology, and immunohistochemistry. Knockdown of BMP4 in pregnant mice at the middle embryonic stage led to aganglionosis. It was therefore demonstrated that BMP‑Smad was essential to the NCSCs of middle stage embryos. BMP‑Smad served important roles in the generation of aganglionosis. This technique of knockdown BMP4 gene may be used to establish an aganglionosis mouse model.
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Affiliation(s)
- Hong-Bo Li
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
| | - Xian-Qing Jin
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
| | - Xin Jin
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
| | - Zheng-Hua Guo
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
| | - Xiong-Hui Ding
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
| | - Quan Wang
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
| | - Rui-Zhuo Liu
- Department of Pediatric Surgery, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400014, P.R. China
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14
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Becker BK, Speed JS, Powell M, Pollock DM. Activation of neuronal endothelin B receptors mediates pressor response through alpha-1 adrenergic receptors. Physiol Rep 2017; 5:5/4/e13077. [PMID: 28219980 PMCID: PMC5328762 DOI: 10.14814/phy2.13077] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 11/10/2016] [Accepted: 11/12/2016] [Indexed: 12/20/2022] Open
Abstract
Abnormalities in activity of the endothelin (ET) system have been widely reported in a number of cardiovascular disease states such as hypertension and heart failure. Although the vascular responses to ET are well established, the interaction between ET and other important modulators of blood pressure, such as the sympathetic nervous system, are less understood. Previous reports implicate ET signaling through ET type B (ETB) receptors in increasing neuronal activity. Therefore, we hypothesized that activation of ETB receptors on sympathetic nerves would increase blood pressure through an adrenergic‐mediated mechanism. Thus, we used anesthetized ETB‐deficient rats, which only express functional ETB receptors on adrenergic neurons, and genetic controls, which express functional ETB receptors in vascular tissue and kidney epithelium. We determined the pressor response to the selective ETB receptor agonist sarafotoxin c (S6c). Separate groups of rats were treated with the α1‐adrenergic receptor antagonist prazosin or the β‐adrenergic receptor antagonist propranolol to elucidate the role of adrenergic signaling in mediating the blood pressure response. We observed a dose‐dependent pressor response to S6c in ETB‐deficient rats that was reversed by prazosin treatment and augmented by propranolol. In genetic control rats, the effects of S6c on sympathetic neurons were mostly masked by the direct activity of ETB receptor activation on the vasculature. Heart rate was mostly unaffected by S6c across all groups and treatments. These results suggest that ETB activation on sympathetic neurons causes an increase in blood pressure mediated through α1‐adrenergic receptor signaling.
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Affiliation(s)
- Bryan K Becker
- Division of Nephrology, Department of Medicine, Cardio-Renal Physiology and Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Joshua S Speed
- Division of Nephrology, Department of Medicine, Cardio-Renal Physiology and Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Mackenzie Powell
- Division of Nephrology, Department of Medicine, Cardio-Renal Physiology and Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M Pollock
- Division of Nephrology, Department of Medicine, Cardio-Renal Physiology and Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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15
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Becker BK, Feagans AC, Chen D, Kasztan M, Jin C, Speed JS, Pollock JS, Pollock DM. Renal denervation attenuates hypertension but not salt sensitivity in ET B receptor-deficient rats. Am J Physiol Regul Integr Comp Physiol 2017; 313:R425-R437. [PMID: 28701323 DOI: 10.1152/ajpregu.00174.2017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 06/16/2017] [Accepted: 07/06/2017] [Indexed: 02/07/2023]
Abstract
Hypertension is a prevalent pathology that increases risk for numerous cardiovascular diseases. Because the etiology of hypertension varies across patients, specific and effective therapeutic approaches are needed. The role of renal sympathetic nerves is established in numerous forms of hypertension, but their contribution to salt sensitivity and interaction with factors such as endothelin-1 are poorly understood. Rats deficient of functional ETB receptors (ETB-def) on all tissues except sympathetic nerves are hypertensive and exhibit salt-sensitive increases in blood pressure. We hypothesized that renal sympathetic nerves contribute to hypertension and salt sensitivity in ETB-def rats. The hypothesis was tested through bilateral renal sympathetic nerve denervation and measuring blood pressure during normal salt (0.49% NaCl) and high-salt (4.0% NaCl) diets. Denervation reduced mean arterial pressure in ETB-def rats compared with sham-operated controls by 12 ± 3 (SE) mmHg; however, denervation did not affect the increase in blood pressure after 2 wk of high-salt diet (+19 ± 3 vs. +16 ± 3 mmHg relative to normal salt diet; denervated vs. sham, respectively). Denervation reduced cardiac sympathetic-to-parasympathetic tone [low frequency-high frequency (LF/HF)] during normal salt diet and vasomotor LF/HF tone during high-salt diet in ETB-def rats. We conclude that the renal sympathetic nerves contribute to the hypertension but not to salt sensitivity of ETB-def rats.
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Affiliation(s)
- Bryan K Becker
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Amanda C Feagans
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Daian Chen
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Malgorzata Kasztan
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Chunhua Jin
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Joshua S Speed
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Jennifer S Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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16
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Endothelin receptor-specific control of endoplasmic reticulum stress and apoptosis in the kidney. Sci Rep 2017; 7:43152. [PMID: 28230089 PMCID: PMC5322462 DOI: 10.1038/srep43152] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 01/20/2017] [Indexed: 12/14/2022] Open
Abstract
Endothelin-1 (ET-1) promotes renal damage during cardiovascular disease; yet, the molecular mechanisms involved remain unknown. Endoplasmic reticulum (ER) stress, triggered by unfolded protein accumulation in the ER, contributes to apoptosis and organ injury. These studies aimed to determine whether the ET-1 system promotes renal ER stress development in response to tunicamycin. ETB deficient (ETB def) or transgenic control (TG-con) rats were used in the presence or absence of ETA receptor antagonism. Tunicamycin treatment similarly increased cortical ER stress markers in both rat genotypes; however, only ETB def rats showed a 14-24 fold increase from baseline for medullary GRP78, sXBP-1, and CHOP. Pre-treatment of TG-con rats with the ETA blocker ABT-627 for 1 week prior to tunicamycin injection significantly reduced the ER stress response in cortex and medulla, and also inhibited renal apoptosis. Pre-treatment with ABT-627 failed to decrease renal ER stress and apoptosis in ETB def rats. In conclusion, the ET-1 system is important for the development of tunicamycin-induced renal ER stress and apoptosis. ETA receptor activation induces renal ER stress genes and apoptosis, while functional activation of the ETB receptor has protective effects. These results highlight targeting the ETA receptor as a therapeutic approach against ER stress-induced kidney injury.
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17
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Miller E, Czopek A, Duthie KM, Kirkby NS, van de Putte EEF, Christen S, Kimmitt RA, Moorhouse R, Castellan RFP, Kotelevtsev YV, Kuc RE, Davenport AP, Dhaun N, Webb DJ, Hadoke PWF. Smooth Muscle Endothelin B Receptors Regulate Blood Pressure but Not Vascular Function or Neointimal Remodeling. Hypertension 2016; 69:275-285. [PMID: 28028193 PMCID: PMC5222555 DOI: 10.1161/hypertensionaha.115.07031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 01/02/2016] [Accepted: 11/30/2016] [Indexed: 01/06/2023]
Abstract
Supplemental Digital Content is available in the text. The role of smooth muscle endothelinB (ETB) receptors in regulating vascular function, blood pressure (BP), and neointimal remodeling has not been established. Selective knockout mice were generated to address the hypothesis that loss of smooth muscle ETB receptors would reduce BP, alter vascular contractility, and inhibit neointimal remodeling. ETB receptors were selectively deleted from smooth muscle by crossing floxed ETB mice with those expressing cre-recombinase controlled by the transgelin promoter. Functional consequences of ETB deletion were assessed using myography. BP was measured by telemetry, and neointimal lesion formation induced by femoral artery injury. Lesion size and composition (day 28) were analyzed using optical projection tomography, histology, and immunohistochemistry. Selective deletion of ETB was confirmed by genotyping, autoradiography, polymerase chain reaction, and immunohistochemistry. ETB-mediated contraction was reduced in trachea, but abolished from mesenteric veins, of knockout mice. Induction of ETB-mediated contraction in mesenteric arteries was also abolished in these mice. Femoral artery function was unaltered, and baseline BP modestly elevated in smooth muscle ETB knockout compared with controls (+4.2±0.2 mm Hg; P<0.0001), but salt-induced and ETB blockade–mediated hypertension were unaltered. Circulating endothelin-1 was not altered in knockout mice. ETB-mediated contraction was not induced in femoral arteries by incubation in culture medium or lesion formation, and lesion size was not altered in smooth muscle ETB knockout mice. In the absence of other pathology, ETB receptors in vascular smooth muscle make a small but significant contribution to ETB-dependent regulation of BP. These ETB receptors have no effect on vascular contraction or neointimal remodeling.
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Affiliation(s)
- Eileen Miller
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Alicja Czopek
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Karolina M Duthie
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Nicholas S Kirkby
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Elisabeth E Fransen van de Putte
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Sibylle Christen
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Robert A Kimmitt
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Rebecca Moorhouse
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Raphael F P Castellan
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Yuri V Kotelevtsev
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Rhoda E Kuc
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Anthony P Davenport
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Neeraj Dhaun
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - David J Webb
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.)
| | - Patrick W F Hadoke
- From the University/BHF Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (E.M., A.C., K.M.D., N.S.K., E.E.F.v.d.P., R.A.K., R.M., R.F.P.C., N.D., D.J.W., P.W.F.H.); University of Basel, Switzerland (S.C.); Centre for Functional Genomics, Skolkovo Institute of Science and Technology, Russian Federation (Y.V.K.); and Division of Experimental Medicine and Immunotherapeutics, Addenbrooke's Hospital, Cambridge, United Kingdom (R.E.K., A.P.D.).
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Functional ET(A)-ET(B) Receptor Cross-talk in Basilar Artery In Situ From ET(B) Receptor Deficient Rats. J Cardiovasc Pharmacol 2016; 67:212-7. [PMID: 26528589 DOI: 10.1097/fjc.0000000000000335] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The role of endothelin (ET)(A)-ET(B) receptor cross-talk in limiting the ET(A) receptor antagonist inhibition of ET-1 constriction is revealed by the partial or complete dependency of the ET(A) receptor antagonist inhibition on functional removal of the ET(B) receptor. Although functional removal of the ET(B) receptor is generally accomplished with ET(B) receptor antagonist, a novel approach using rats containing a naturally occurring deletion mutation in the ET(B) receptor [rescued "spotting lethal" (sl) rats; ET(B)(sl/sl)] demonstrated increased ET(A) receptor antagonist inhibition of ET-1 constriction in vena cava. We investigated whether this deletion mutation was also sufficient to remove the ET(B) receptor dependency of the ET(A) receptor antagonist inhibition of ET-1 constriction in the basilar artery. Consistent with previous reports, ET-1 plasma levels were elevated in ET(B)(sl/sl) as compared with ET(B)(+/+) rats. ET(B) receptor antagonist failed to relax the ET-1 constricted basilar artery from ET(B)(+/+) and ET(B)(sl/sl) rats. Relaxation to combined ET(A) and ET(B) receptor antagonist was greater than relaxation to ET(A) receptor antagonist in the basilar artery from ET(B)(+/+) and, unexpectedly, ET(B)(sl/sl) rats. These findings confirm the presence of ET(A)-ET(B) receptor cross-talk in the basilar artery. We speculate that mutant ET(B) receptor expression produced by alternative splicing may be sufficient to allow cross-talk.
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Johnston JG, Speed JS, Jin C, Pollock DM. Loss of endothelin B receptor function impairs sodium excretion in a time- and sex-dependent manner. Am J Physiol Renal Physiol 2016; 311:F991-F998. [PMID: 27582096 DOI: 10.1152/ajprenal.00103.2016] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 08/27/2016] [Indexed: 12/28/2022] Open
Abstract
Recent studies suggested a direct link between circadian rhythms and regulation of sodium excretion. Endothelin-1 (ET-1) regulates sodium balance by promoting natriuresis through the endothelin B receptor (ETB) in response to increased salt in the diet, but the effect that the time of day has on this natriuretic response is not known. Therefore, this study was designed to test the hypothesis that ETB receptor activation contributes to the diurnal control of sodium excretion and that sex differences contribute to this control as well. Twelve-hour urine collections were used to measure sodium excretion. On day 3 of the experiment, a NaCl load (900 μeq) was given by oral gavage either at Zeitgeber time [ZT] 0 (inactive period) or ZT12 (active period) to examine the natriuretic response to the acute salt load. Male and female ETB-deficient (ETB def) rats showed an impaired natriuretic response to a salt load at ZT0 compared with their respective transgenic controls (Tg cont). Male ETB def rats showed a delayed natriuretic response to a salt load given at ZT12 compared with male Tg cont, a contrast to the prompt response shown by female ETB def rats. Treatment with ABT-627, an ETA receptor antagonist, improved the natriuretic response seen within the first 12 h of a ZT0 salt load in both sexes. These findings demonstrate that diurnal excretion of an acute salt load 1) requires ET-1 and the ETB receptor, 2) is more evident in male vs. female rats, and 3) is opposed by the ETA receptor.
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Affiliation(s)
- Jermaine G Johnston
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Joshua S Speed
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Chunhua Jin
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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20
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Abstract
Glomerular filtration rate (GFR) and renal plasma flow (RPF) increase by 40-65% and 50-85%, respectively, during normal pregnancy in women. Studies using the gravid rat as a model have greatly enhanced our understanding of mechanisms underlying these remarkable changes in the renal circulation during gestation. Hyperfiltration appears to be almost completely due to the increase in RPF, the latter attributable to profound reductions in both the renal afferent and efferent arteriolar resistances. The major pregnancy hormone involved is relaxin. The mediators downstream from relaxin include endothelin (ET) and nitric oxide (NO). New evidence indicates that relaxin increases vascular gelatinase activity during pregnancy, thereby converting big ET to ET(1-32), which leads to renal vasodilation, hyperfiltration, and reduced myogenic reactivity of small renal arteries via the endothelial ET(B) receptor and NO. Whether the chronic volume expansion characteristic of pregnancy contributes to the maintenance of gestational renal changes requires further investigation. Additional studies are also needed to further delineate the molecular basis of these mechanisms and, importantly, to investigate whether they apply to women.
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Affiliation(s)
- Kirk P Conrad
- Departments of Obstetrics, Gynecology and Reproductive Sciences, and Cell Biology and Physiology, University of Pittsburgh School of Medicine and Magee-Women's Research Institute, Pittsburgh, Pennsylvania 15213, USA.
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21
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Ayala-Valdovinos MA, Galindo-García J, Sánchez-Chiprés D, Duifhuis-Rivera T. New test for endothelin receptor type B (EDNRB) mutation genotyping in horses. Mol Cell Probes 2016; 30:182-4. [DOI: 10.1016/j.mcp.2016.03.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 03/18/2016] [Accepted: 03/24/2016] [Indexed: 10/22/2022]
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22
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Akashi K, Saegusa J, Sendo S, Nishimura K, Okano T, Yagi K, Yanagisawa M, Emoto N, Morinobu A. Knockout of endothelin type B receptor signaling attenuates bleomycin-induced skin sclerosis in mice. Arthritis Res Ther 2016; 18:113. [PMID: 27209208 PMCID: PMC4875589 DOI: 10.1186/s13075-016-1011-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 05/03/2016] [Indexed: 02/07/2023] Open
Abstract
Background Endothelin-1 (ET-1) is important in the pathogenesis of systemic sclerosis (SSc). ET-1 binds two receptors, endothelin type A (ETA) and endothelin type B (ETB). Dual ETA/ETB receptor antagonists and a selective ETA receptor antagonist are used clinically to treat SSc, and the effect of these antagonists on fibroblast activation has been described. However, the role of ETB receptor signaling in fibrogenesis is less clear. This study was conducted to evaluate the profibrotic function of ETB receptor signaling in a murine model of bleomycin (BLM)-induced scleroderma. Methods We used ETB receptor–knockout (ETBKO) mice, which are genetically rescued from lethal intestinal aganglionosis by an ETB receptor transgene driven by the human dopamine β-hydroxylase (DβH)-gene promoter, and wild-type mice with DβH-ETB (WT). BLM or phosphate-buffered saline (PBS) was administered subcutaneously by osmotic minipump, and skin fibrosis was assessed by dermal thickness, subcutaneous fat atrophy, and myofibroblast count in the dermis. Dermal fibroblasts isolated from ETBKO and WT mice were cultured in vitro, stimulated with BLM or ET-1, and the expression of profibrotic genes was compared by quantitative PCR. Results Dermal thickness, subcutaneous fat atrophy, and myofibroblast counts in the dermis were significantly reduced in ETBKO mice compared to WT mice, after BLM treatment. Compared with wild-type, dermal fibroblasts isolated from ETBKO mice showed lower gene expressions of α-smooth muscle actin and collagen 1α1 in response to BLM or ET-1 stimulation in vitro. Conclusions ET-1–ETB receptor signaling is involved in skin sclerosis and in collagen synthesis by dermal fibroblasts. Electronic supplementary material The online version of this article (doi:10.1186/s13075-016-1011-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kengo Akashi
- Department of Rheumatology and Clinical Immunology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Jun Saegusa
- Department of Rheumatology and Clinical Immunology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Sho Sendo
- Department of Rheumatology and Clinical Immunology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Keisuke Nishimura
- Department of Rheumatology and Clinical Immunology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Takuya Okano
- Department of Clinical Pharmacy, Kobe Pharmaceutical University, Kobe, Japan.,Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Keiko Yagi
- Department of Clinical Pharmacy, Kobe Pharmaceutical University, Kobe, Japan
| | - Masashi Yanagisawa
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Japan
| | - Noriaki Emoto
- Department of Clinical Pharmacy, Kobe Pharmaceutical University, Kobe, Japan.,Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Akio Morinobu
- Department of Rheumatology and Clinical Immunology, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan.
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23
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Davenport AP, Hyndman KA, Dhaun N, Southan C, Kohan DE, Pollock JS, Pollock DM, Webb DJ, Maguire JJ. Endothelin. Pharmacol Rev 2016; 68:357-418. [PMID: 26956245 PMCID: PMC4815360 DOI: 10.1124/pr.115.011833] [Citation(s) in RCA: 489] [Impact Index Per Article: 61.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The endothelins comprise three structurally similar 21-amino acid peptides. Endothelin-1 and -2 activate two G-protein coupled receptors, ETA and ETB, with equal affinity, whereas endothelin-3 has a lower affinity for the ETA subtype. Genes encoding the peptides are present only among vertebrates. The ligand-receptor signaling pathway is a vertebrate innovation and may reflect the evolution of endothelin-1 as the most potent vasoconstrictor in the human cardiovascular system with remarkably long lasting action. Highly selective peptide ETA and ETB antagonists and ETB agonists together with radiolabeled analogs have accurately delineated endothelin pharmacology in humans and animal models, although surprisingly no ETA agonist has been discovered. ET antagonists (bosentan, ambrisentan) have revolutionized the treatment of pulmonary arterial hypertension, with the next generation of antagonists exhibiting improved efficacy (macitentan). Clinical trials continue to explore new applications, particularly in renal failure and for reducing proteinuria in diabetic nephropathy. Translational studies suggest a potential benefit of ETB agonists in chemotherapy and neuroprotection. However, demonstrating clinical efficacy of combined inhibitors of the endothelin converting enzyme and neutral endopeptidase has proved elusive. Over 28 genetic modifications have been made to the ET system in mice through global or cell-specific knockouts, knock ins, or alterations in gene expression of endothelin ligands or their target receptors. These studies have identified key roles for the endothelin isoforms and new therapeutic targets in development, fluid-electrolyte homeostasis, and cardiovascular and neuronal function. For the future, novel pharmacological strategies are emerging via small molecule epigenetic modulators, biologicals such as ETB monoclonal antibodies and the potential of signaling pathway biased agonists and antagonists.
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Affiliation(s)
- Anthony P Davenport
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - Kelly A Hyndman
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - Neeraj Dhaun
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - Christopher Southan
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - Donald E Kohan
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - Jennifer S Pollock
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - David M Pollock
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - David J Webb
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
| | - Janet J Maguire
- Experimental Medicine and Immunotherapeutics, University of Cambridge, Cambridge, United Kingdom (A.P.D., J.J.M.); IUPHAR/BPS Guide to PHARMACOLOGY, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, Edinburgh, United Kingdom (C.S.); Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah (D.E.K.); Cardio-Renal Physiology & Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama (K.A.H., J.S.P., D.M.P.); and Department of Renal Medicine, Royal Infirmary of Edinburgh (N.D.) and University/British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute (D.J.W.N.D.), Edinburgh, Scotland, United Kingdom
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Abstract
PURPOSE Hirschsprung disease (HSCR) is a congenital and heterogeneous disorder, which is caused by no neuronal ganglion cells in part or all of distal gastrointestinal tract. Recently, our genome-wide association study has identified solute carrier family 6, proline IMINO transporter, member 20 (SLC6A20) as one of the potential risk factors for HSCR development. This study performed a replication study for the association of SLC6A20 polymorphisms with HSCR and an extended analysis to investigate further associations for subgroups and haplotypes. METHODS For the replication study, a total of 40 single nucleotide polymorphisms (SNPs) of SLC6A20 were genotyped in 187 HSCR subjects composed of 121 short-segment HSCR, 45 long-segment HSCR (L-HSCR), 21 total colonic aganglionosis, and 283 unaffected controls. Imputation was performed using genotype data from our genome-wide association study and this replication study. RESULTS Imputed meta-analysis revealed that 13 SLC6A20 SNPs (minimum P = 0.0002 at rs6770261) were significantly associated with HSCR even after correction for multiple comparisons using false discovery rate (FDR) (minimum PFDR = .005). In further subgroup analysis, SLC6A20 polymorphisms appeared to have increased associations with L-HSCR. Moreover, haplotype analysis also showed significant associations between 2 haplotypes (BL3_ht2 and BL4_ht2) and HSCR susceptibility (PFDR < .05). CONCLUSIONS Although further replications and functional evaluations are required, our results suggest that SLC6A20 may have roles in HSCR development and in the extent of aganglionic segment during enteric nervous system development.
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Saldana-Caboverde A, Perera EM, Watkins-Chow DE, Hansen NF, Vemulapalli M, Mullikin JC, Pavan WJ, Kos L. The transcription factors Ets1 and Sox10 interact during murine melanocyte development. Dev Biol 2015; 407:300-12. [PMID: 25912689 PMCID: PMC4618791 DOI: 10.1016/j.ydbio.2015.04.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 04/06/2015] [Accepted: 04/07/2015] [Indexed: 11/19/2022]
Abstract
Melanocytes, the pigment-producing cells, arise from multipotent neural crest (NC) cells during embryogenesis. Many genes required for melanocyte development were identified using mouse pigmentation mutants. The variable spotting mouse pigmentation mutant arose spontaneously at the Jackson Laboratory. We identified a G-to-A nucleotide transition in exon 3 of the Ets1 gene in variable spotting, which results in a missense G102E mutation. Homozygous variable spotting mice exhibit sporadic white spotting. Similarly, mice carrying a targeted deletion of Ets1 exhibit hypopigmentation; nevertheless, the function of Ets1 in melanocyte development is unknown. The transcription factor Ets1 is widely expressed in developing organs and tissues, including the NC. In the chick, Ets1 is required for the expression of Sox10, a transcription factor critical for the development of various NC derivatives, including melanocytes. We show that Ets1 is required early for murine NC cell and melanocyte precursor survival in vivo. Given the importance of Ets1 for Sox10 expression in the chick, we investigated a potential genetic interaction between these genes by comparing the hypopigmentation phenotypes of single and double heterozygous mice. The incidence of hypopigmentation in double heterozygotes was significantly greater than in single heterozygotes. The area of hypopigmentation in double heterozygotes was significantly larger than would be expected from the addition of the areas of hypopigmentation of single heterozygotes, suggesting that Ets1 and Sox10 interact synergistically in melanocyte development. Since Sox10 is also essential for enteric ganglia development, we examined the distal colons of Ets1 null mutants and found a significant decrease in enteric innervation, which was exacerbated by Sox10 heterozygosity. At the molecular level, Ets1 was found to activate an enhancer critical for Sox10 expression in NC-derived structures. Furthermore, enhancer activation was significantly inhibited by the variable spotting mutation. Together, these results suggest that Ets1 and Sox10 interact to promote proper melanocyte and enteric ganglia development from the NC.
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Affiliation(s)
| | - Erasmo M Perera
- Department of Biological Sciences, Florida International University, Miami, FL, USA
| | - Dawn E Watkins-Chow
- Genetic Disease Research Branch, National Human Genome Institute, National Institutes of Health, Bethesda, MD, USA
| | - Nancy F Hansen
- Comparative Genomics Analysis Unit, CGCGB, National Human Genome Research Institute, Bethesda, MD, USA
| | - Meghana Vemulapalli
- NIH Intramural Sequencing Center, National Human Genome Research Institute, Rockville, MD, USA
| | - James C Mullikin
- Comparative Genomics Analysis Unit, CGCGB, National Human Genome Research Institute, Bethesda, MD, USA; NIH Intramural Sequencing Center, National Human Genome Research Institute, Rockville, MD, USA
| | - William J Pavan
- Genetic Disease Research Branch, National Human Genome Institute, National Institutes of Health, Bethesda, MD, USA
| | - Lidia Kos
- Department of Biological Sciences, Florida International University, Miami, FL, USA; Biomolecular Sciences Institute, Florida International University, Miami, FL.
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26
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Fellner RC, Guan Z, Cook AK, Pollock DM, Inscho EW. Endothelin contributes to blunted renal autoregulation observed with a high-salt diet. Am J Physiol Renal Physiol 2015; 309:F687-96. [PMID: 26246513 DOI: 10.1152/ajprenal.00641.2014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 07/29/2015] [Indexed: 01/03/2023] Open
Abstract
Autoregulation of renal blood flow (RBF) is an essential function of the renal microcirculation that has been previously shown to be blunted by excessive dietary salt. Endogenous endothelin 1 (ET-1) is increased following a high-salt (HS) diet and contributes to the control of RBF but the differential effects of ET-1 on renal microvessel autoregulation in response to HS remain to be established. We hypothesized that a HS diet increases endothelin receptor activation in normal Sprague-Dawley rats and blunts autoregulation of RBF. The role of ET-1 in the blunted autoregulation produced by a HS diet was assessed in vitro and in vivo using the blood-perfused juxtamedullary nephron preparation and anesthetized rats, respectively. Using highly selective antagonists, we observed that blockade of either ETA or ETB receptors was sufficient to restore normal autoregulatory behavior in afferent arterioles from HS-fed rats. Additionally, normal autoregulatory behavior was restored in vivo in HS-fed rats by simultaneous ETA and ETB receptor blockade, whereas blockade of ETB receptors alone showed significant improvement of normal autoregulation of RBF. Consistent with this observation, autoregulation of RBF in ETB receptor-deficient rats fed HS was similar to both ETB-deficient rats and transgenic control rats on normal-salt diets. These data support the hypothesis that endogenous ET-1, working through ETB and possibly ETA receptors, contributes to the blunted renal autoregulatory behavior in rats fed a HS diet.
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Affiliation(s)
- Robert C Fellner
- Department of Physiology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia
| | - Zhengrong Guan
- Department of Physiology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia; Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Anthony K Cook
- Department of Physiology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia; Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M Pollock
- Section of Experimental Medicine, Department of Medicine, Medical College of Georgia, Georgia Regents University, Augusta, Georgia; and Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Edward W Inscho
- Department of Physiology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia; Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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Impaired Cellular Immunity in the Murine Neural Crest Conditional Deletion of Endothelin Receptor-B Model of Hirschsprung's Disease. PLoS One 2015; 10:e0128822. [PMID: 26061883 PMCID: PMC4465674 DOI: 10.1371/journal.pone.0128822] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 05/01/2015] [Indexed: 12/22/2022] Open
Abstract
Hirschsprung’s disease (HSCR) is characterized by aganglionosis from failure of neural crest cell (NCC) migration to the distal hindgut. Up to 40% of HSCR patients suffer Hirschsprung’s-associated enterocolitis (HAEC), with an incidence that is unchanged from the pre-operative to the post-operative state. Recent reports indicate that signaling pathways involved in NCC migration may also be involved in the development of secondary lymphoid organs. We hypothesize that gastrointestinal (GI) mucosal immune defects occur in HSCR that may contribute to enterocolitis. EdnrB was deleted from the neural crest (EdnrBNCC-/-) resulting in mutants with defective NCC migration, distal colonic aganglionosis and the development of enterocolitis. The mucosal immune apparatus of these mice was interrogated at post-natal day (P) 21–24, prior to histological signs of enterocolitis. We found that EdnrBNCC-/- display lymphopenia of their Peyer’s Patches, the major inductive site of GI mucosal immunity. EdnrBNCC-/- Peyer’s Patches demonstrate decreased B-lymphocytes, specifically IgM+IgDhi (Mature) B-lymphocytes, which are normally activated and produce IgA following antigen presentation. EdnrBNCC-/- animals demonstrate decreased small intestinal secretory IgA, but unchanged nasal and bronchial airway secretory IgA, indicating a gut-specific defect in IgA production or secretion. In the spleen, which is the primary source of IgA-producing Mature B-lymphocytes, EdnrBNCC-/- animals display decreased B-lymphocytes, but an increase in Mature B-lymphocytes. EdnrBNCC-/- spleens are also small and show altered architecture, with decreased red pulp and a paucity of B-lymphocytes in the germinal centers and marginal zone. Taken together, these findings suggest impaired GI mucosal immunity in EdnrBNCC-/- animals, with the spleen as a potential site of the defect. These findings build upon the growing body of literature that suggests that intestinal defects in HSCR are not restricted to the aganglionic colon but extend proximally, even into the ganglionated small intestine and immune cells.
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Speed JS, D'Angelo G, Wach PA, Sullivan JC, Pollock JS, Pollock DM. High salt diet increases the pressor response to stress in female, but not male ETB-receptor-deficient rats. Physiol Rep 2015; 3:3/3/e12326. [PMID: 25802361 PMCID: PMC4393160 DOI: 10.14814/phy2.12326] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Acute stress in both rodents and humans causes a transient rise in blood pressure associated with an increase in plasma endothelin-1 (ET-1). High salt (HS) intake also increases ET-1 production, and interestingly, blunts the pressor response to acute air jet stress in rats. We previously reported that female rats lacking functional ETB receptors everywhere except sympathetic nerves (ETB def) had a greater degree of hypertension in response to a HS diet compared to their male counterparts when measured by the tail cuff method. However, we now report that salt-induced hypertension is not different between sexes when measured by telemetry. Therefore, additional experiments were designed to test the hypothesis that female ETB def rats are more sensitive to acute stress when on a HS diet. The pressor response, measured by telemetry, to acute air jet stress was similar between male transgenic control (Tg control) and ETB def rats following chronic HS intake. In contrast, female ETB def rats had a significantly greater pressor response (about twofold higher) than female or male Tg control or male ETB def rats maintained on HS, a finding that cannot be explained by increased vascular reactivity to ET-1 in female rats as we observed that male ETB def rats had a greater pressor response to i.v. infusion of ET-1 compared to females. Furthermore, HS feeding exacerbated the pressor response to ET-1 in both male and female ETB def rats. Given our previous studies demonstrating that the ETA receptor functions to reduce the pressor response to acute stress, these findings further support a role for the ET receptor system in the pressor response to acute stress and that female rats have reduced ETA receptor activity when on a HS diet compared to males.
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Affiliation(s)
- Joshua S Speed
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Gerard D'Angelo
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Paul A Wach
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jennifer C Sullivan
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jennifer S Pollock
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - David M Pollock
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
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Abstract
Total colonic aganglionosis is a relatively uncommon form of Hirschsprung's disease (HSCR). It occurs in approximately 2-13 % of HSCR cases and involves the entire colon which is aganglionic but may extend proximally into varying lengths of small bowel. As a result, it should be separated into Total colonic aganglionosis (TCA) [defined as aganglionosis extending from the anus to at least the ileocaecal valve but no more than 50 cm small bowel proximal to the ileocaecal valve] and total colonic and small bowel aganglionosis (TCSA) which may involve very long segments of small bowel aganglionosis. Clinically, TCA appears to represent a different spectrum of disease in terms of presentation and difficulties which may be experienced in diagnosis suggesting a different pathophysiology from the more common forms of HSCR. It is therefore not yet clear whether TCA merely represents a long form of HSCR or a different expression of the disease. A number of differences exist between TCA and other forms of HSCR which require explanation if its ubiquitous clinical features are to be understood. In addition to the usual explanations for the aganglionosis of HSCR, there is some evidence suggesting that in place of being purely congenital, it may represent certain different pathophysiologic mechanisms, some of which may continue to be active after birth. This study reviews what is known about the clinical, radiological and histopathologic differences between TCA and the more frequently encountered recto-sigmoid (or short-segment; S-HSCR) and correlates them with what is currently known about the genetic and molecular biologic background to find possible pathogenetic mechanisms.
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Affiliation(s)
- S W Moore
- Department of Paediatric Surgery, Faculty of Medicine, University of Stellenbosch, P.O. Box 19063, Tygerberg, 7505, South Africa,
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30
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Lehmann LH, Stanmore DA, Backs J. The role of endothelin-1 in the sympathetic nervous system in the heart. Life Sci 2014; 118:165-72. [PMID: 24632477 DOI: 10.1016/j.lfs.2014.03.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Revised: 02/10/2014] [Accepted: 03/01/2014] [Indexed: 12/15/2022]
Abstract
Endothelin-1 (ET1) is a peptide that was initially identified as a strong inductor of vascular contraction. In the last 25 years, there have been several biological processes identified in which ET1 seems to play a critical role. In particular, genetic studies have unveiled that ET1 is important for neuronal development, growth and function. Experimental studies identified ET1 as a regulator of the interaction between sympathetic neurons and cardiac myocytes. This might be of clinical importance since patients suffering from heart failure are characterized by disrupted norepinephrine homeostasis in the heart. This review summarizes the important findings on the role of ET1 for sympathetic neurons and norepinephrine homeostasis in the heart.
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Affiliation(s)
- Lorenz H Lehmann
- Research Unit Cardiac Epigenetics, Department of Cardiology, University of Heidelberg, and DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - David A Stanmore
- Research Unit Cardiac Epigenetics, Department of Cardiology, University of Heidelberg, and DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany
| | - Johannes Backs
- Research Unit Cardiac Epigenetics, Department of Cardiology, University of Heidelberg, and DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, 69120 Heidelberg, Germany.
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31
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Pollock DM. 2013 Dahl Lecture: American Heart Association council for high blood pressure research clarifying the physiology of endothelin. Hypertension 2014; 63:e110-7. [PMID: 24614220 DOI: 10.1161/hypertensionaha.114.02441] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- David M Pollock
- Cardio-Renal Physiology and Medicine, Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL 35233.
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Kolettis TM, Oikonomidis DL, Baibaki MEE, Barka E, Kontonika M, Tsalikakis DG, Papalois A, Kyriakides ZS. Endothelin B-receptors and sympathetic activation: impact on ventricular arrhythmogenesis during acute myocardial infarction. Life Sci 2014; 118:281-7. [PMID: 24503339 DOI: 10.1016/j.lfs.2014.01.069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 12/26/2013] [Accepted: 01/23/2014] [Indexed: 12/26/2022]
Abstract
AIMS We investigated the role of endothelin-B receptors on sympathetic activation originating from the adrenal gland or from the myocardium and its impact on arrhythmogenesis during acute myocardial infarction. MAIN METHODS We studied two groups of rats (n=120, 284±2 g), namely wild-type and ETB-deficient. Myocardial infarction was induced by permanent ligation of the left coronary artery and ventricular tachyarrhythmias were evaluated from continuous electrocardiographic recordings. Sympathetic activation, measured by indices of heart rate variability, was evaluated after adrenalectomy or catecholamine depletion induced by reserpine. Acute left ventricular failure was assessed by total animal activity. KEY FINDINGS Adrenalectomy decreased the total duration of tachyarrhythmias in ETB-deficient rats, but their incidence remained higher, compared to wild-type rats. After reserpine, heart rate variability indices and tachyarrhythmias were similar in the two groups during the initial, ischaemic phase. During evolving infarction, tachyarrhythmia duration was longer in ETB-deficient rats, despite lower sympathetic activation. Heart rate was lower in ETB-deficient rats throughout the 24-hour observation period, whereas activity was comparable in the two groups. SIGNIFICANCE Endothelin-B receptors modulate sympathetic activation during acute myocardial infarction not only in the ventricular myocardium, but also in the adrenal gland. Sympathetic activation markedly increases early-phase ventricular tachyarrhythmias, but other mechanisms involving the endothelin system underlie delayed arrhythmogenesis.
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Affiliation(s)
- Theofilos M Kolettis
- Department of Cardiology, University of Ioannina, Ioannina, Greece; Cardiovascular Research Institute, Ioannina and Athens, Greece.
| | | | - Maria-Eleni E Baibaki
- Department of Cardiology, University of Ioannina, Ioannina, Greece; Cardiovascular Research Institute, Ioannina and Athens, Greece; Experimental Research Center ELPEN, Pikermi, Athens, Greece
| | - Eleonora Barka
- Department of Materials Science and Engineering, University of Ioannina, Greece
| | - Marianthi Kontonika
- Department of Cardiology, University of Ioannina, Ioannina, Greece; Cardiovascular Research Institute, Ioannina and Athens, Greece
| | - Dimitrios G Tsalikakis
- Engineering Informatics and Telecommunications, University of Western Macedonia, Kozani, Greece
| | - Apostolos Papalois
- Cardiovascular Research Institute, Ioannina and Athens, Greece; Experimental Research Center ELPEN, Pikermi, Athens, Greece
| | - Zenon S Kyriakides
- Cardiovascular Research Institute, Ioannina and Athens, Greece; First Department of Cardiology, Red Cross Hospital, Athens, Greece
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Gisser JM, Cohen AR, Yin H, Gariepy CE. A novel bidirectional interaction between endothelin-3 and retinoic acid in rat enteric nervous system precursors. PLoS One 2013; 8:e74311. [PMID: 24040226 PMCID: PMC3767828 DOI: 10.1371/journal.pone.0074311] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 08/02/2013] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Signaling through the endothelin receptor B (EDNRB) is critical for the development of the enteric nervous system (ENS) and mutations in endothelin system genes cause Hirschsprung's aganglionosis in humans. Penetrance of the disease is modulated by other genetic factors. Mutations affecting retinoic acid (RA) signaling also produce aganglionosis in mice. Thus, we hypothesized that RA and endothelin signaling pathways may interact in controlling development of the ENS. METHODS Rat immunoselected ENS precursor cells were cultured with the EDNRB ligand endothelin-3, an EDNRB-selective antagonist (BQ-788), and/or RA for 3 or 14 days. mRNA levels of genes related to ENS development, RA- and EDNRB-signaling were measured at 3 days. Proliferating cells and cells expressing neuronal, glial, and myofibroblast markers were quantified. RESULTS Culture of isolated ENS precursors for 3 days with RA decreases expression of the endothelin-3 gene and that of its activation enzyme. These changes are associated with glial proliferation, a higher percentage of glia, and a lower percentage of neurons compared to cultures without RA. These changes are independent of EDNRB signaling. Conversely, EDNRB activation in these cultures decreases expression of RA receptors β and γ mRNA and affects the expression of the RA synthetic and degradative enzymes. These gene expression changes are associated with reduced glial proliferation and a lower percentage of glia in the culture. Over 14 days in the absence of EDNRB signaling, RA induces the formation of a heterocellular plexus replete with ganglia, glia and myofibroblasts. CONCLUSIONS A complex endothelin-RA interaction exists that coordinately regulates the development of rat ENS precursors in vitro. These results suggest that environmental RA may modulate the expression of aganglionosis in individuals with endothelin mutations.
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Affiliation(s)
- Jonathan M. Gisser
- The Center for Molecular and Human Genetics, the Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
- Department of Pediatrics, the Ohio State University, Columbus, Ohio, United States of America
| | - Ariella R. Cohen
- The Center for Molecular and Human Genetics, the Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
| | - Han Yin
- The Biostatistics Shared Resources, Nationwide Children’s Hospital, Columbus, Ohio, United States of America
| | - Cheryl E. Gariepy
- The Center for Molecular and Human Genetics, the Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
- Department of Pediatrics, the Ohio State University, Columbus, Ohio, United States of America
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Lake JI, Heuckeroth RO. Enteric nervous system development: migration, differentiation, and disease. Am J Physiol Gastrointest Liver Physiol 2013; 305:G1-24. [PMID: 23639815 PMCID: PMC3725693 DOI: 10.1152/ajpgi.00452.2012] [Citation(s) in RCA: 229] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The enteric nervous system (ENS) provides the intrinsic innervation of the bowel and is the most neurochemically diverse branch of the peripheral nervous system, consisting of two layers of ganglia and fibers encircling the gastrointestinal tract. The ENS is vital for life and is capable of autonomous regulation of motility and secretion. Developmental studies in model organisms and genetic studies of the most common congenital disease of the ENS, Hirschsprung disease, have provided a detailed understanding of ENS development. The ENS originates in the neural crest, mostly from the vagal levels of the neuraxis, which invades, proliferates, and migrates within the intestinal wall until the entire bowel is colonized with enteric neural crest-derived cells (ENCDCs). After initial migration, the ENS develops further by responding to guidance factors and morphogens that pattern the bowel concentrically, differentiating into glia and neuronal subtypes and wiring together to form a functional nervous system. Molecules controlling this process, including glial cell line-derived neurotrophic factor and its receptor RET, endothelin (ET)-3 and its receptor endothelin receptor type B, and transcription factors such as SOX10 and PHOX2B, are required for ENS development in humans. Important areas of active investigation include mechanisms that guide ENCDC migration, the role and signals downstream of endothelin receptor type B, and control of differentiation, neurochemical coding, and axonal targeting. Recent work also focuses on disease treatment by exploring the natural role of ENS stem cells and investigating potential therapeutic uses. Disease prevention may also be possible by modifying the fetal microenvironment to reduce the penetrance of Hirschsprung disease-causing mutations.
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Affiliation(s)
- Jonathan I. Lake
- 1Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri; and
| | - Robert O. Heuckeroth
- 1Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri; and ,2Department of Developmental, Regenerative, and Stem Cell Biology, Washington University School of Medicine, St. Louis, Missouri
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Butler Tjaden NE, Trainor PA. The developmental etiology and pathogenesis of Hirschsprung disease. Transl Res 2013; 162:1-15. [PMID: 23528997 PMCID: PMC3691347 DOI: 10.1016/j.trsl.2013.03.001] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/25/2013] [Accepted: 03/01/2013] [Indexed: 02/08/2023]
Abstract
The enteric nervous system is the part of the autonomic nervous system that directly controls the gastrointestinal tract. Derived from a multipotent, migratory cell population called the neural crest, a complete enteric nervous system is necessary for proper gut function. Disorders that arise as a consequence of defective neural crest cell development are termed neurocristopathies. One such disorder is Hirschsprung disease (HSCR), also known as congenital megacolon or intestinal aganglionosis. HSCR occurs in 1/5000 live births and typically presents with the inability to pass meconium, along with abdominal distension and discomfort that usually requires surgical resection of the aganglionic bowel. This disorder is characterized by a congenital absence of neurons in a portion of the intestinal tract, usually the distal colon, because of a disruption of normal neural crest cell migration, proliferation, differentiation, survival, and/or apoptosis. The inheritance of HSCR disease is complex, often non-Mendelian, and characterized by variable penetrance. Extensive research has identified a number of key genes that regulate neural crest cell development in the pathogenesis of HSCR including RET, GDNF, GFRα1, NRTN, EDNRB, ET3, ZFHX1B, PHOX2b, SOX10, and SHH. However, mutations in these genes account for only ∼50% of the known cases of HSCR. Thus, other genetic mutations and combinations of genetic mutations and modifiers likely contribute to the etiology and pathogenesis of HSCR. The aims of this review are to summarize the HSCR phenotype, diagnosis, and treatment options; to discuss the major genetic causes and the mechanisms by which they disrupt normal enteric neural crest cell development; and to explore new pathways that may contribute to HSCR pathogenesis.
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Reissmann M, Ludwig A. Pleiotropic effects of coat colour-associated mutations in humans, mice and other mammals. Semin Cell Dev Biol 2013; 24:576-86. [PMID: 23583561 DOI: 10.1016/j.semcdb.2013.03.014] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 03/27/2013] [Accepted: 03/28/2013] [Indexed: 12/20/2022]
Abstract
The characterisation of the pleiotropic effects of coat colour-associated mutations in mammals illustrates that sensory organs and nerves are particularly affected by disorders because of the shared origin of melanocytes and neurocytes in the neural crest; e.g. the eye-colour is a valuable indicator of disorders in pigment production and eye dysfunctions. Disorders related to coat colour-associated alleles also occur in the skin (melanoma), reproductive tract and immune system. Additionally, the coat colour phenotype of an individual influences its general behaviour and fitness. Mutations in the same genes often produce similar coat colours and pleiotropic effects in different species (e.g., KIT [reproductive disorders, lethality], EDNRB [megacolon] and LYST [CHS]). Whereas similar disorders and similar-looking coat colour phenotypes sometimes have a different genetic background (e.g., deafness [EDN3/EDNRB, MITF, PAX and SNAI2] and visual diseases [OCA2, RAB38, SLC24A5, SLC45A2, TRPM1 and TYR]). The human predilection for fancy phenotypes that ignore disorders and genetic defects is a major driving force for the increase of pleiotropic effects in domestic species and laboratory subjects since domestication has commenced approximately 18,000 years ago.
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Key Words
- AS
- ASIP
- ATRN
- Agouti signalling protein
- Albino
- Angelman syndrome
- Attractin (mahogany)
- BLOC
- Biogenesis of lysosomal organelles complex
- CCSD
- CHS
- CSD
- CSNB
- Canine congenital sensorineural deafness
- Chediak-Higashi syndrome
- Coat colour gene
- Congenital sensorineural deafness
- Congenital stationary night blindness
- Disorder
- EDN3
- EDNRB
- Endothelin 3
- Endothelin receptor type B
- Epistasis
- Fitness
- GS
- Griscelli syndrome (type 1 or 2)
- HPS
- HSCR
- Hermansky-Pudlak syndrome with different types
- Hirschsprung disease
- IPE
- Iris pigment epithelium
- KIT
- KIT ligand (steel factor)
- KITLG
- LFS
- LYST
- Lavender foal syndrome
- Lethal
- Leucism
- Lysosomal trafficking regulator
- MC1R
- MCOA
- MCOLN3
- MGRN1
- MITF
- MYO5A
- Mahogunin ring finger 1 (E3 ubiquitin protein ligase)
- Melanocortin 1 receptor
- Melanoma
- Microphthalmia-associated transcription factor
- Mucolipin 3 (TRPML3)
- Multiple congenital ocular anomalies
- Myosin VA (heavy chain 12, myoxin)
- OA
- OCA
- OCA2
- OLWS
- OSTM1
- Ocular albinism
- Oculocutaneous albinism II (pink-eye dilution homolog)
- Oculocutaneous albinism type 1–4
- Osteopetrosis associated transmembrane protein 1 (Grey lethal osteopetrosis)
- Overo lethal white syndrome
- PAX3
- PMEL
- PWS
- Paired box 3
- Pleiotropy
- Prader-Willi syndrome
- Premelanosome protein (Pmel17, SILV)
- RAB27A
- RAB27A member RAS oncogene family
- RAB38
- RAB38 member RAS oncogene family
- RPE
- Reproduction
- Retinal pigmented epithelium
- SLC24A5
- SLC2A9
- SLC45A2
- SNAI2
- STX17
- Snail homolog 2 (Drosophila), (SLUG), SOX10, SRY (sex determining region Y)-box 10
- Solute carrier family 2 (facilitated glucose transporter), member 9
- Solute carrier family 24, member 5
- Solute carrier family 45, member 2, MATP
- Syntaxin 17
- TRPM1
- TYR
- Tameness
- Transient receptor potential cation channel, subfamily M, member 1 (melastatin-1)
- Tyrosinase, TYRP1, Tyrosinase-related protein 1
- V-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog, tyrosine kinase receptor (c-kit)
- WS
- Waardenburg syndrome (type 1, type 2 combined with Tietz syndrome type 3 Klein-Waardenburg syndrome, type 4 Waardenburg-Shah syndrome)
- alpha-melanocyte-stimulating hormone
- αMSH
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Affiliation(s)
- Monika Reissmann
- Humboldt University Berlin, Department for Crop and Animal Sciences, Berlin, Germany.
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A high resolution genetic mapping of the faded (fe) gene to a region between D10mit156 and D10mit193 on mouse chromosome 10. Lab Anim Res 2013; 29:33-8. [PMID: 23573106 PMCID: PMC3616207 DOI: 10.5625/lar.2013.29.1.33] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 02/28/2013] [Accepted: 03/02/2013] [Indexed: 01/28/2023] Open
Abstract
The C57BL/6J-fe/fe mouse is a coat color mutant. The coat color of the homozygote mouse becomes progressively lighter with advancing age. The faded gene (fe) of C57BL/6J-fe/fe was mapped in a 2.0 cM distal to D10mit191 by our group. To make a high-resolution map, we used the Korean wild mouse (KWHM) for a backcross panel, which was captured in 1995 and has been maintained as an inbred line by our laboratory. In the inter-specific backcross panel (N=400), the fe gene was mapped to 1.0 cM distal to D10mit156. The gene order was defined: centromere -D10mit3/85 (1.3±0.6 cM)-D10mit155 (1.3±0.6 cM)-D10mit191 (2.0±0.7 cM)-D10mit156 (1.0±0.5 cM)-fe-D10mit193 (1.3±0.6 cM)-D10mit54 (1.0±0.5 cM)-D10mit44 (8.5±1.4 cM)-D10mit42 (10.0±1.5 cM). The measured distance between D10mit191 and D10mit 44 differed in both inter-specific (DBA/2) and intra-specific (KWHM) backcross panels (14.2 vs 13.8 cM). Taken together, our high-resolution linkage map of the fe locus from an intra-specific backcross panel will provide a good entry point to isolate the fe gene.
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Anorectal neural crest derived cell behavior after the migration of vagal neural crest derived cells is surgically disrupted: implications for the etiology of Hirschsprung's disease. Pediatr Surg Int 2013; 29:9-12. [PMID: 23143079 DOI: 10.1007/s00383-012-3201-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND/PURPOSE In Hirschsprung's disease (HD), thick extrinsic nerve fibers can be associated with the aganglionic segment in the anorectum. We surgically disrupted the migration of vagal neural crest cell-derived cells (vagal NCC) in embryos from transgenic mice we created previously (SOX10-VENUS Tg) which have the SOX10 gene labeled with Venus (V), a green fluorescent protein, to observe sacral NCC activity in the anorectum. METHOD Proximal colon harvested from SOX10-VENUS Tg embryos on day 10.5 (n = 10) was transected at the ascending colon. V-positive sacral NCC in the anorectum were observed during organ culture under fluorescence stereoscopic microscopy, and compared with non-transected control specimens (n = 10). RESULTS In transected specimens, no V-positive sacral NCC were identified initially in the anorectum. By day 2, there were thick beaded sacral NCC in the anorectum in 6/10 (60 %) that migrated steadily to the transected end over 3-4 days. In controls, thinner and shorter V-positive sacral NCC began migrating cranially on day 2, and were met by distally migrating vagal NCC. CONCLUSION Disruption of vagal NCC migration appears to induce sacral NCC activity in the anorectum, suggesting that thick extrinsic nerve fibers seen in HD may be a secondary phenomenon.
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Minton AZ, Phatak NR, Stankowska DL, He S, Ma HY, Mueller BH, Jiang M, Luedtke R, Yang S, Brownlee C, Krishnamoorthy RR. Endothelin B receptors contribute to retinal ganglion cell loss in a rat model of glaucoma. PLoS One 2012; 7:e43199. [PMID: 22916224 PMCID: PMC3423444 DOI: 10.1371/journal.pone.0043199] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Accepted: 07/18/2012] [Indexed: 12/29/2022] Open
Abstract
Glaucoma is an optic neuropathy, commonly associated with elevated intraocular pressure (IOP) characterized by optic nerve degeneration, cupping of the optic disc, and loss of retinal ganglion cells which could lead to loss of vision. Endothelin-1 (ET-1) is a 21-amino acid vasoactive peptide that plays a key role in the pathogenesis of glaucoma; however, the receptors mediating these effects have not been defined. In the current study, endothelin B (ETB) receptor expression was assessed in vivo, in the Morrison's ocular hypertension model of glaucoma in rats. Elevation of IOP in Brown Norway rats produced increased expression of ETB receptors in the retina, mainly in retinal ganglion cells (RGCs), nerve fiber layer (NFL), and also in the inner plexiform layer (IPL) and inner nuclear layer (INL). To determine the role of ETB receptors in neurodegeneration, Wistar-Kyoto wild type (WT) and ETB receptor-deficient (KO) rats were subjected to retrograde labeling with Fluoro-Gold (FG), following which IOP was elevated in one eye while the contralateral eye served as control. IOP elevation for 4 weeks in WT rats caused an appreciable loss of RGCs, which was significantly attenuated in KO rats. In addition, degenerative changes in the optic nerve were greatly reduced in KO rats compared to those in WT rats. Taken together, elevated intraocular pressure mediated increase in ETB receptor expression and its activation may contribute to a decrease in RGC survival as seen in glaucoma. These findings raise the possibility of using endothelin receptor antagonists as neuroprotective agents for the treatment of glaucoma.
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Affiliation(s)
- Alena Z. Minton
- Department of Cell Biology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Nitasha R. Phatak
- Department of Cell Biology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Dorota L. Stankowska
- Department of Cell Biology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Shaoqing He
- Department of Cell Biology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Hai-Ying Ma
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Brett H. Mueller
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Ming Jiang
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Robert Luedtke
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Shaohua Yang
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Colby Brownlee
- Department of Cell Biology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
| | - Raghu R. Krishnamoorthy
- Department of Cell Biology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States of America
- * E-mail:
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Endothelin-B Receptors and Left Ventricular Dysfunction after Regional versus Global Ischaemia-Reperfusion in Rat Hearts. Cardiol Res Pract 2012; 2012:986813. [PMID: 22844633 PMCID: PMC3403336 DOI: 10.1155/2012/986813] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 05/23/2012] [Accepted: 06/01/2012] [Indexed: 11/20/2022] Open
Abstract
Background. Endothelin-1 (ET-1) is implicated in left ventricular dysfunction after ischaemia-reperfusion. ETA and ETB receptors mediate diverse actions, but it is unknown whether these actions depend on ischaemia type and duration. We investigated the role of ETB receptors after four ischaemia-reperfusion protocols in isolated rat hearts.
Methods. Left ventricular haemodynamic variables were measured in the Langendorff-perfused model after 40- and 20-minute regional or global ischaemia, followed by 30-minute reperfusion. Wild-type (n = 39) and ETB-deficient (n = 41) rats were compared. Infarct size was measured using fluorescent microspheres after regional ischaemia-reperfusion.
Results. Left ventricular dysfunction was more prominent in ETB-deficient rats, particularly after regional ischaemia. Infarct size was smaller (P = 0.006) in wild-type (31.5 ± 4.4%) than ETB-deficient (45.0 ± 7.3%) rats after 40 minutes of regional ischaemia-reperfusion. Although the recovery of left ventricular function was poorer after 40-minute ischaemia-reperfusion, end-diastolic pressure in ETB-deficient rats was higher after 20 than after 40 minutes of regional ischaemia-reperfusion.
Conclusion. ETB receptors exert cytoprotective effects in the rat heart, mainly after regional ischaemia-reperfusion. Longer periods of ischaemia suppress the recovery of left ventricular function after reperfusion, but the role of ETB receptors may be more important during the early phases.
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Cho J, Kim H, Kang DW, Yanagisawa M, Ko C. Endothelin B receptor is not required but necessary for finite regulation of ovulation. Life Sci 2012; 91:613-7. [PMID: 22406076 DOI: 10.1016/j.lfs.2012.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2011] [Revised: 02/07/2012] [Accepted: 02/13/2012] [Indexed: 11/28/2022]
Abstract
AIMS In the ovary, endothelins regulate a variety of ovarian functions that include but not limited to folliculogenesis, steroidogenesis, oocyte maturation, ovulation and corpus luteum (CL) function. Two cognate receptors, EDNRA and EDNRB are constitutively expressed in the ovary, and mediate the regulatory endothelin actions. However, the physiological significance of the presence of the two receptors that often elicit opposite responses upon activation by an endothelin is yet to be determined. This study was proposed to test the hypothesis that both receptors are present in the ovary to lend an endothelin a finite regulation of ovulation. MAIN METHODS A rescued EDNRB knockout (rEDNRB-KO) mouse that is deficient of EDNRB expression in all cells but adrenergic cell lineage was used to test the impact of the loss of function of EDNRB on ovulation. The EDNRB gene deletion and its confirmation at mRNA level were assessed by molecular biology techniques, and the number and size of corpus lutea was determined by ovarian histology. KEY FINDINGS Female rEDNRB-KO mice had larger litter sizes (numbers of pups per birth) and their ovaries contained more corpora lutea than wild type littermates. SIGNIFICANCE This result shows that without EDNRB excessive ovulation occurs, suggesting a role of EDNRB in having the extent of ovulation confined.
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Affiliation(s)
- Jongki Cho
- Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA
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Abstract
The enteric nervous system (ENS), the intrinsic innervation of the gastrointestinal tract, consists of numerous types of neurons, and glial cells, that are distributed in two intramuscular plexuses that extend along the entire length of the gut and control co-ordinated smooth muscle contractile activity and other gut functions. All enteric neurons and glia are derived from neural crest cells (NCC). Vagal (hindbrain) level NCC provide the majority of enteric precursors along the entire length of the gut, while a lesser contribution, that is restricted to the hindgut, arises from the sacral region of the neuraxis. After leaving the dorsal neural tube NCC undergo extensive migration, proliferation, survival and differentiation in order to form a functional ENS. This article reviews the molecular mechanisms underlying these key developmental processes and highlights the major groups of molecules that affect enteric NCC proliferation and survival (Ret/Gdnf and EdnrB/Et-3 pathways, Sox10 and Phox2b transcription factors), cell migration (Ret and EdnrB signalling, semaphorin 3A, cell adhesion molecules, Rho GTPases), and the development of enteric neuronal subtypes and morphologies (Mash1, Gdnf/neurturin, BMPs, Hand2, retinoic acid). Finally, looking to the future, we discuss the need to translate the wealth of data gleaned from animal studies to the clinical area and thus better understand, and develop treatments for, congenital human diseases affecting the ENS.
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Ida-Eto M, Ohgami N, Iida M, Yajima I, Kumasaka MY, Takaiwa K, Kimitsuki T, Sone M, Nakashima T, Tsuzuki T, Komune S, Yanagisawa M, Kato M. Partial requirement of endothelin receptor B in spiral ganglion neurons for postnatal development of hearing. J Biol Chem 2011; 286:29621-6. [PMID: 21715336 DOI: 10.1074/jbc.m111.236802] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Impairments of endothelin receptor B (Ednrb/EDNRB) cause the development of Waardenburg-Shah syndrome with congenital hearing loss, hypopigmentation, and megacolon disease in mice and humans. Hearing loss in Waardenburg-Shah syndrome has been thought to be caused by an Ednrb-mediated congenital defect of melanocytes in the stria vascularis (SV) of inner ears. Here we show that Ednrb expressed in spiral ganglion neurons (SGNs) in inner ears is required for postnatal development of hearing in mice. Ednrb protein was expressed in SGNs from WT mice on postnatal day 19 (P19), whereas it was undetectable in SGNs from WT mice on P3. Correspondingly, Ednrb homozygously deleted mice (Ednrb(-/-) mice) with congenital hearing loss showed degeneration of SGNs on P19 but not on P3. The congenital hearing loss involving neurodegeneration of SGNs as well as megacolon disease in Ednrb(-/-) mice were markedly improved by introducing an Ednrb transgene under control of the dopamine β-hydroxylase promoter (Ednrb(-/-);DBH-Ednrb mice) on P19. Neither defects of melanocytes nor hypopigmentation in the SV and skin in Ednrb(-/-) mice was rescued in the Ednrb(-/-);DBH-Ednrb mice. Thus, the results of this study indicate a novel role of Ednrb expressed in SGNs distinct from that in melanocytes in the SV contributing partially to postnatal hearing development.
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Affiliation(s)
- Michiru Ida-Eto
- Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Kasugai, Aichi, Japan
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Tsai YH, Murakami N, Gariepy CE. Postnatal intestinal engraftment of prospectively selected enteric neural crest stem cells in a rat model of Hirschsprung disease. Neurogastroenterol Motil 2011; 23:362-9. [PMID: 21199176 PMCID: PMC3105196 DOI: 10.1111/j.1365-2982.2010.01656.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Identification of neuronal progenitor/stem cells in the postnatal gut suggests the development of transplantation approaches to enteric nervous system (ENS) diseases. Many clinical applications would require engrafting large segments of postnatal gut in vivo. We investigated the ability of unselected gut cells vs selected enteric neural crest stem cells (eNCSCs) to engraft and differentiate in the postnatal gut in the Hirschsprung disease (HD, ednrb(sl/sl)) rat. METHODS Total intestinal cells or eNCSCs (α(4) integrin(+), p75(++)) from embryonic day (E)14.5 rats carrying a marker transgene (human placental alkaline phosphatase, hPAP) were injected intraperitoneally (i.p.) into neonatal HD rats and their healthy littermates. The entire gut was systematically analyzed 3 weeks later for hPAP(+) cells between the serosal surface and the muscularis mucosae. Engrafted cells were examined for HuC/D, S-100B, neuropeptide Y (NPY), neuronal nitric oxide synthase (nNOS), and vasoactive intestinal peptide (VIP) expression. KEY RESULTS No rats (0/33) injected with unselected cells had hPAP(+) cells in the ENS that expressed neuronal or glial markers. 5/11 healthy and 4/5 HD rats injected with eNCSCs showed widespread but low density engraftment in the ENS with cells expressing neuronal or glial markers. Neurons expressed nNOS and VIP. There was no engraftment in the colon of either HD or wildtype rats. CONCLUSIONS & INFERENCES Enteric neural crest stem cells will engraft diffusely throughout the postnatal gut of HD rats and differentiate into neurons and glia. Engraftment is not uniform, likely related to age-dependent changes in the gut mesenchyme. Intraperitoneal injection is easily performed in sick neonates and may be developed as a technique to supply exogenous ENS cells to the diseased postnatal gut.
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Affiliation(s)
- Yu-Hwai Tsai
- Department of Pediatrics, University of Michigan Medical School, Ann Arbor, Michigan 48109-0622
| | - Naoko Murakami
- The Research Institute at Nationwide Children’s Hospital, Columbus, Ohio 43205
| | - Cheryl E. Gariepy
- The Research Institute at Nationwide Children’s Hospital, Columbus, Ohio 43205, Department of Pediatrics, The Ohio State University College of Medicine, Columbus Ohio 43210, Pediatric Gastroenterology, Nationwide Children’s Hospital, Columbus, Ohio 43205
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Mapping of the Faded ( fe) Gene to a Region between D10mit191and D10mit44on Mouse Chromosome 10. Lab Anim Res 2011; 27:41-6. [PMID: 21826159 PMCID: PMC3145985 DOI: 10.5625/lar.2011.27.1.41] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2011] [Revised: 02/26/2011] [Accepted: 02/28/2011] [Indexed: 11/21/2022] Open
Abstract
The faded mouse is a coat color mutant that shows faded coat color and age-related loss of pigmentation. This mutation is transmitted by an autosomal recessive gene with 100% penetrance. In the present study, we carried out linkage analysis of the faded (fe) gene using intra-specific backcross panels. Affected faded mice were carefully confirmed by their faded coat color at about 4 weeks of age. In the intra-specific backcross between faded and CBA mice (n=198), the fe gene was mapped to a region 2.1 cM distal to D10mit191. Therefore, the gene order was defined as follows: centromere-D10mit51 (12.4±2.4 cM)-D10mit191 (2.1±1.0 cM)-fe-D10mit44 (13.3±2.4 cM)-D10mit42 (14.4±2.5 cM). This linkage map of the fe locus will provide a good entry point to isolate the fe gene. Since the faded mouse has pigmentary abnormalities, this mutant may be a useful model for studies of pigmentary abnormalities in humans.
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Kitada K, Yui N, Koyama M, Kimura K, Suzuki R, Tanaka R, Mori T, Ohkita M, Matsumura Y. Endothelin ETB Receptor Is Involved in Sex Differences in the Development of Balloon Injury-Induced Neointimal Formation. J Pharmacol Exp Ther 2010; 336:533-9. [DOI: 10.1124/jpet.109.165308] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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Liu L, Zacchia M, Tian X, Wan L, Sakamoto A, Yanagisawa M, Alpern RJ, Preisig PA. Acid regulation of NaDC-1 requires a functional endothelin B receptor. Kidney Int 2010; 78:895-904. [DOI: 10.1038/ki.2010.264] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Oikonomidis DL, Baltogiannis GG, Kolettis TM. Do endothelin receptor antagonists have an antiarrhythmic potential during acute myocardial infarction? Evidence from experimental studies. J Interv Card Electrophysiol 2010; 28:157-65. [DOI: 10.1007/s10840-010-9493-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 05/05/2010] [Indexed: 11/24/2022]
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