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Ebo DG, Van Houdt M, Beyens M, Toscano A, Mertens C, Van Gasse AL, Bruhns P, Sabato V, Elst J. IgE-Mediated Mast Cell Responses to Rocuronium: A Matter of Protonation Status. Clin Exp Allergy 2024. [PMID: 38960735 DOI: 10.1111/cea.14536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 06/11/2024] [Accepted: 06/18/2024] [Indexed: 07/05/2024]
Affiliation(s)
- Didier G Ebo
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
- Department of Immunology and Allergology, AZ Jan Palfijn Gent, Ghent, Belgium
| | - Michel Van Houdt
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
| | - Michiel Beyens
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
| | - Alessandro Toscano
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
| | - Christel Mertens
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
| | - Athina L Van Gasse
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
- Faculty of Medicine and Health Sciences, Department of Paediatrics and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Paediatrics, Antwerp University Hospital, Antwerp, Belgium
| | - Pierre Bruhns
- Antibodies in Therapy and Pathology, Institut Pasteur, Université Paris Cité, INSERM UMR1222, Paris, France
| | - Vito Sabato
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
| | - Jessy Elst
- Faculty of Medicine and Health Sciences, Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium
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Moustafa A, Habara Y. Cross talk between polysulfide and nitric oxide in rat peritoneal mast cells. Am J Physiol Cell Physiol 2016; 310:C894-902. [PMID: 27053521 DOI: 10.1152/ajpcell.00028.2016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 03/30/2016] [Indexed: 01/02/2023]
Abstract
The aim of this study was to define the effects of polysulfide on intracellular Ca(2+) concentration ([Ca(2+)]i) and the underlying machinery, especially from the hydrogen sulfide (H2S) and nitric oxide (NO) perspectives, in rat peritoneal mast cells. We found that a polysulfide donor, Na2S4, increased [Ca(2+)]i, which is both extracellular and intracellular Ca(2+) dependent. Intracellular Ca(2+) release induced by Na2S4 was attenuated by the addition of a ryanodine receptor blocker. A slow-releasing H2S donor, GYY4137, dose dependently increased [Ca(2+)]i that was independent from extracellular Ca(2+) influx. The GYY4137-induced [Ca(2+)]i release was partially attenuated in the presence of the ryanodine receptor blocker. Both polysulfide and H2S donors increased the intracellular NO levels in DAF-2-loaded mast cells, which were abolished by an NO scavenger, cPTIO. Inhibition of NO synthase (NOS) significantly abolished the polysulfide- or H2S-donor-induced [Ca(2+)]i elevation in the absence of extracellular Ca(2+) An NO donor, diethylamine (DEA) NONOate, increased [Ca(2+)]i in a concentration-dependent manner, in which both extracellular and intracellular Ca(2+) are associated. At higher concentrations, the DEA NONOate-induced [Ca(2+)]i increases were attenuated in the absence of extracellular Ca(2+) and by the addition of the ryanodine receptor blocker. H2S and NO dose dependently induced polysulfide production. Curiously, polysulfide, H2S, and NO donors had no effect on mast cell degranulation. Among synthases, cystathionine-γ-lyase, and neuronal NOS seemed to be the major H2S- and NO-producing synthases, respectively. These results indicate that polysulfide acts as a potential signaling molecule that regulates [Ca(2+)]i homeostasis in rat peritoneal mast cells via a cross talk with NO and H2S.
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Affiliation(s)
- Amira Moustafa
- Laboratory of Physiology, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan; and Department of Physiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Yoshiaki Habara
- Laboratory of Physiology, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan; and
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Yoshida Y, Hirata K, Matsuoka H, Iwamoto S, Kotaka M, Fujita H, Aisu N, Hoshino S, Kosaka T, Maeda K, Kiyomi F, Yamashita Y. A single-arm Phase II validation study of preventing oxaliplatin-induced hypersensitivity reactions by dexamethasone: the AVOID trial. Drug Des Devel Ther 2015; 9:6067-73. [PMID: 26648694 PMCID: PMC4648596 DOI: 10.2147/dddt.s94901] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Patients with colorectal cancer treated with oxaliplatin are at risk of hypersensitivity reactions, with the incidence estimated to be 12%-20%. Coinfusion of dexamethasone and oxaliplatin could potentially reduce the incidence of these reactions, but oxaliplatin is reported to be incompatible with alkaline compounds in solution. However, in a previous retrospective study we found that the pH of a solution of dexamethasone and oxaliplatin was less than 7.4, and that hypersensitivity to oxaliplatin could have been prevented by coinfusion of dexamethasone. We aimed to evaluate the effectiveness of coinfusion of dexamethasone and oxaliplatin to prevent oxaliplatin-induced hypersensitivity reactions. PATIENTS AND METHODS The AVOID trial was a prospective, multicenter, open-label, single-arm Phase II trial conducted from January to September 2013. The study included 73 patients who received capecitabine plus oxaliplatin (XELOX) or XELOX plus bevacizumab therapy for colorectal cancer. In all patients, oxaliplatin was administered in combination with dexamethasone. The primary outcome measure was the presence of hypersensitivity reactions. RESULTS Hypersensitivity reactions occurred in three patients (4.1%); all three experienced a cutaneous reaction (grade 1 erythema). None of the 73 patients developed respiratory symptoms, ocular symptoms, or anaphylaxis. Grade 3 or higher hemotoxicity occurred in 13.7% of the patients and grade 3 or higher nonhematological toxicity occurred in 13.7%. The response rate to treatment was 64.4%. CONCLUSION The coinfusion of dexamethasone and oxaliplatin effectively reduced oxaliplatin-induced hypersensitivity reactions in patients with colorectal cancer. This approach should be considered for all patients treated with oxaliplatin, allowing treatment to be completed as planned.
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Affiliation(s)
- Yoichiro Yoshida
- Department of Gastroenterological Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan
| | - Keiji Hirata
- Department of Surgery, Fukuoka Sanno Hospital, Fukuoka, Japan
| | - Hiroshi Matsuoka
- Department of Surgery, Fujita Health University School of Medicine, Toyoake, Japan
| | - Shigeyoshi Iwamoto
- Department of Surgery, Kansai Medical University Hirakata Hospital, Osaka, Japan
| | | | - Hideto Fujita
- Department of Surgical Oncology, Kanazawa Medical University, Uchinada, Japan
| | - Naoya Aisu
- Department of Gastroenterological Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan
| | - Seiichiro Hoshino
- Department of Gastroenterological Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan
| | - Takeo Kosaka
- Department of Surgical Oncology, Kanazawa Medical University, Uchinada, Japan
| | - Kotaro Maeda
- Department of Surgery, Fujita Health University School of Medicine, Toyoake, Japan
| | - Fumiaki Kiyomi
- Academia, Industry and Government Collaborative Research Institute of Translational Medicine for Life Innovation, Fukuoka University, Fukuoka, Japan
| | - Yuichi Yamashita
- Department of Gastroenterological Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan
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Wang L, Ding G, Gu Q, Schwarz W. Single-channel properties of a stretch-sensitive chloride channel in the human mast cell line HMC-1. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2010; 39:757-67. [PMID: 19823818 PMCID: PMC2847164 DOI: 10.1007/s00249-009-0542-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2009] [Accepted: 09/09/2009] [Indexed: 12/11/2022]
Abstract
A stretch-activated (SA) Cl(-) channel in the plasma membrane of the human mast cell line HMC-1 was identified in outside-out patch-clamp experiments. SA currents, induced by pressure applied to the pipette, exhibited voltage dependence with strong outward rectification (55.1 pS at +100 mV and an about tenfold lower conductance at -100 mV). The probability of the SA channel being open (P (o)) also showed steep outward rectification and pressure dependence. The open-time distribution was fitted with three components with time constants of tau(1o) = 755.1 ms, tau(2o) = 166.4 ms, and tau(3o) = 16.5 ms at +60 mV. The closed-time distribution also required three components with time constants of tau(1c) = 661.6 ms, tau(2c) = 253.2 ms, and tau(3c) = 5.6 ms at +60 mV. Lowering extracellular Cl(-) concentration reduced the conductance, shifted the reversal potential toward chloride reversal potential, and decreased the P (o) at positive potentials. The SA Cl(-) currents were reversibly blocked by the chloride channel blocker 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid (DIDS) but not by (Z)-1-(p-dimethylaminoethoxyphenyl)-1,2-diphenyl-1-butene (tamoxifen). Furthermore, in HMC-1 cells swelling due to osmotic stress, DIDS could inhibit the increase in intracellular [Ca(2+)] and degranulation. We conclude that in the HMC-1 cell line, the SA outward currents are mediated by Cl(-) influx. The SA Cl(-) channel might contribute to mast cell degranulation caused by mechanical stimuli or accelerate membrane fusion during the degranulation process.
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Affiliation(s)
- Lina Wang
- Shanghai Research Center for Acupuncture and Meridians, Department of Mechanics and Engineering Science, Fudan University, 220 Handan Rd, Shanghai, 200433 China
- Max Planck Institute for Biophysics, Max-von-Laue Str. 3, 60438 Frankfurt am Main, Germany
| | - Guanghong Ding
- Shanghai Research Center for Acupuncture and Meridians, Department of Mechanics and Engineering Science, Fudan University, 220 Handan Rd, Shanghai, 200433 China
| | - Quanbao Gu
- Shanghai Research Center for Acupuncture and Meridians, Department of Mechanics and Engineering Science, Fudan University, 220 Handan Rd, Shanghai, 200433 China
| | - Wolfgang Schwarz
- Shanghai Research Center for Acupuncture and Meridians, Department of Mechanics and Engineering Science, Fudan University, 220 Handan Rd, Shanghai, 200433 China
- Max Planck Institute for Biophysics, Max-von-Laue Str. 3, 60438 Frankfurt am Main, Germany
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Pernas-Sueiras O, Alfonso A, Vieytes MR, Botana LM. Mast cell exocytosis can be triggered by ammonium chloride with just a cytosolic alkalinization and no calcium increase. J Cell Physiol 2005; 204:775-84. [PMID: 15754334 DOI: 10.1002/jcp.20334] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A human mast cell line (HMC-1) has been used to study the effect of cytosolic alkaline pH in exocytosis. Compound 48/80, concanavalin A, and thapsigargin do not induce histamine release in HMC-1 cells. Although thapsigargin does not activate histamine release, it does show a large increase in cytosolic Ca(2+), and no change in cytosolic pH. However, when HMC-1 cells were activated with ionomycin, a significant histamine release takes place, and this effect is higher in the presence of thapsigargin. Both drugs show an additive effect on cytosolic Ca(2+) levels. Ammonium chloride (NH(4)Cl) does activate cytosolic alkalinization and histamine release, with no increase in cytosolic Ca(2+). NH(4)Cl does block the release of internal Ca(2+) by thapsigargin, not by ionomycin, and decreases Ca(2+) influx stimulated by these drugs. Under conditions in which the alkalinization induced by NH(4)Cl is blocked by acidification with sodium propionate, histamine release is inhibited. The release of histamine is also observed when NH(4)Cl is added after propionate addition, regardless of the final pH value attained. Our results show that a shift in pH alkaline values, even with final pH below 7.2 is enough to activate histamine release. A shift to less acidic values is a sufficient signal to activate the cells.
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Affiliation(s)
- O Pernas-Sueiras
- Departamento de Farmacología, Facultad de Veterinaria, USC, Lugo, Spain
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6
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Affiliation(s)
- Clifford J Holmes
- Renal Division, Baxter Healthcare Corporation, McGaw Park, Illinois 60085-6730, USA.
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Vilariño N, de la Rosa LA, Vieytes MR, Botana LM. The Cl-HCO3- exchanger slows the recovery of acute pHi changes in rat mast cells. Biochem Pharmacol 2003; 65:389-96. [PMID: 12527331 DOI: 10.1016/s0006-2952(02)01516-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The CO(2)/HCO(3)(-) buffering system is one of the main mechanisms implicated in cytosolic pH (pH(i)) regulation. We studied this pH(i)-regulatory system in rat mast cells using a fluorescent dye. Mast cells had a more alkaline pH(i) in the presence of HCO(3)(-) than in its absence. The recovery from an acid load was faster in HCO(3)(-)-free conditions than in HCO(3)(-)-containing media. In HCO(3)(-)-buffered conditions the increase of the recovery rate of an acidification in 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid-incubated cells suggested the implication of a Na(+)-independent Cl(-)/HCO(3)(-) exchanger. This HCO(3)(-) transport acidified the cytosol and was also partially responsible for the recovery of intracellular alkalinizations. Moreover, regulation of the recovery rate of an acidification by protein kinase C and calcium signaling pathways depended on the presence or absence of HCO(3)(-). The presence of HCO(3)(-) limits the recovery of acute intracellular acidifications probably through the Na(+)-independent Cl(-)/HCO(3)(-) exchanger and modulates the regulation of pH(i) by protein kinase C and calcium.
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Affiliation(s)
- Natalia Vilariño
- Departamento de Farmacología, Facultad de Veterinaria, Universidad Santiago de Compostela, 27002 Lugo, Spain
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8
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Kulka M, Gilchrist M, Duszyk M, Befus AD. Expression and functional characterization of CFTR in mast cells. J Leukoc Biol 2002. [DOI: 10.1189/jlb.71.1.54] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- M. Kulka
- Pulmonary Research Group, University of Alberta, Edmonton, Canada
| | - M. Gilchrist
- Pulmonary Research Group, University of Alberta, Edmonton, Canada
| | - M. Duszyk
- Pulmonary Research Group, University of Alberta, Edmonton, Canada
| | - A. D. Befus
- Pulmonary Research Group, University of Alberta, Edmonton, Canada
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9
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Plum J, Razeghi P, Lordnejad RM, Perniok A, Fleisch M, Fusshöller A, Schneider M, Grabensee B. Peritoneal dialysis fluids with a physiologic pH based on either lactate or bicarbonate buffer-effects on human mesothelial cells. Am J Kidney Dis 2001; 38:867-75. [PMID: 11576893 DOI: 10.1053/ajkd.2001.27709] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Conventional lactate (Lac)-buffered peritoneal dialysis (PD) solutions have turned out to be detrimental to human peritoneal cells, especially because of a low pH. In the present study, we focus on potential differences between Lac and bicarbonate (Bic) as a buffer when adjusted to a physiological pH. All test fluids were buffered with either 40 mmol/L of Lac or 34 mmol/L of Bic, sterile filtered, and adjusted to a pH of 7.4. Osmotic agents used were 1.36% glucose (Glu), 3.86% Glu, 1% amino acids (AA), and 7.5% Glu polymer (Glupoly). Human peritoneal mesothelial cells (HPMCs) were isolated from the omentum majus, grown to confluence, and incubated after the second passage for 15 minutes (37 degrees C and 5% carbon dioxide) with the test fluids. Cytotoxicity was controlled by measuring apoptotic and necrotic cells with cytofluorometry. Aerobic cell metabolism (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide [MTT] assay) and intracellular adenosine triphosphate (ATP) concentrations were measured to assess cell viability. Release of interleukin-6 (IL-6) from HPMCs was determined as a parameter of cellular host defense. No significant difference in apoptosis or necrosis rates was found between the solutions adjusted to normal pH. However, in the MTT assay, Bic solutions were superior to corresponding Lac pendants at an identical pH of 7.4 (P < 0.01). Intracellular ATP concentrations reflected a very similar pattern (P < 0.05). Glupoly in combination with Lac showed an impaired pattern with both the MTT and ATP assays. Regarding IL-1beta-stimulated IL-6 release, there was a small, but not significantly better, response for Bic. Differences in manifest cell cytotoxicity reflected by apoptosis and necrosis rates could not be detected comparing PD solutions buffered with Lac or Bic at a physiological pH. However, distinct parameters of cell metabolism were superior with Bic compared with Lac. Especially Glupoly was inferior in combination with Lac as a buffer.
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Affiliation(s)
- J Plum
- Department of Nephrology and Rheumatology, Heinrich Heine-University, Dusseldorf, Germany.
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10
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Forsythe P, Gilchrist M, Kulka M, Befus AD. Mast cells and nitric oxide: control of production, mechanisms of response. Int Immunopharmacol 2001; 1:1525-41. [PMID: 11515817 DOI: 10.1016/s1567-5769(01)00096-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Mast cells are involved in numerous activities ranging from control of the vasculature, to tissue injury and repair, allergic inflammation and host defences. They synthesize and secrete a variety of mediators, activating and modulating the functions of nearby cells and initiating complex physiological changes. Interestingly, NO produced by mast cells and/or other cells in the microenvironment appears to regulate these diverse roles. This review outlines some of the pathways central to the production of NO by mast cells and identifies many of the tightly controlled regulatory mechanisms involved. Several cofactors and regulatory elements are involved in NO production, and these act at transcriptional and post-translational sites. Their involvement in NO production will be outlined and the possibility that these pathways are critically important in mast cell functions will be discussed. The effects of NO on mast cell functions such as adhesion, activation and mediator secretion will be examined with a focus on molecular mechanisms by which NO modifies intracellular signalling pathways dependent or independent of cGMP and soluble guanylate cyclase. The possibility that NO regulates mast cell function through effects on selected ion channels will be discussed. Metabolic products of NO including peroxynitrite and other reactive species may be the critical elements that affect the actions of NO on mast cell functions. Further understanding of the actions of NO on mast cell activities may uncover novel strategies to modulate inflammatory conditions.
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Affiliation(s)
- P Forsythe
- 574 Heritage Medical Research Center, University of Alberta, Edmonton, Canada
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Lago J, Alfonso A, Vieytes MR, Botana LM. Ouabain-induced enhancement of rat mast cells response. Modulation by protein phosphorylation and intracellular pH. Cell Signal 2001; 13:515-24. [PMID: 11516627 DOI: 10.1016/s0898-6568(01)00169-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The digitalic glicoside ouabain induces potentiation of rat mast cell histamine release in response to several stimuli, which is mediated by Na+/Ca2+ exchanger. In this work, we studied the effect of ouabain on cytosolic calcium, intracellular pH and histamine release with Ca2+ ionophore A23187 in conditions designed to maximize ouabain-induced potentiation of rat mast cells response. The effect of protein kinase C (PKC), cAMP and phosphatase inhibition was also tested. Ouabain induced an enhancement in histamine release, cytosolic calcium and intracellular pH. The adenylate cyclase activator forskolin reduced the effect of ouabain on histamine release and intracellular pH, but enhanced the effect on cytosolic calcium. PKC activator PMA enhanced the effect of ouabain on histamine release and cytosolic calcium, without affecting intracellular pH. A PKC inhibitor, GF-109203X, reduced ouabain-induced enhancement of histamine release and intracellular pH, but increased the enhancement on cytosolic calcium. Finally, inhibition of protein phosphatases 1 and 2A with okadaic acid, increased the effect of ouabain on histamine release and intracellular pH, but reduced cytosolic calcium in presence of ouabain. This result suggest that ouabain-induced potentiation of rat mast cell histamine release with A23187 is modulated by kinases, and this modulation may be carried out by changes in intracellular alkalinization. However, the mechanism underlying cellular alkalinization remains to be elucidated.
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Affiliation(s)
- J Lago
- Departamento de Farmacología, Facultad de Veterinaria, 27002, Lugo, Spain
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Alfonso A, Cabado AG, Vieytes MR, Botana LM. Calcium-pH crosstalks in rat mast cells: cytosolic alkalinization, but not intracellular calcium release, is a sufficient signal for degranulation. Br J Pharmacol 2000; 130:1809-16. [PMID: 10952669 PMCID: PMC1572257 DOI: 10.1038/sj.bjp.0703490] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The aim of this work was to study the relationship between intracellular alkalinization, calcium fluxes and histamine release in rat mast cells. Intracellular alkalinization was induced by nigericin, a monovalent cation ionophore, and by NH(4)Cl (ammonium chloride). Calcium cytosolic and intracellular pH were measured by fluorescence digital imaging using Fura-2-AM and BCECF-AM. In rat mast cells, nigericin and NH(4)Cl induce a dose-dependent intracellular alkalinization, a dose-dependent increase in intracellular calcium levels by releasing calcium from intracellular pools, and an activation of capacitative calcium influx. The increase in both intracellular calcium and pH activates exocytosis (histamine release) in the absence of external calcium. Under the same conditions, thapsigargin does not activate exocytosis, the main difference being that thapsigargin does not alkalinize the cytosol. After alkalinization, histamine release is intracellular-calcium dependent. With 2.5 mM EGTA and thapsigargin the cell response decreases by 62%. The cytosolic alkalinization, in addition to the calcium increase it is enough signal to elicit the exocytotic process in rat mast cells.
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Affiliation(s)
- A Alfonso
- Departamento de Farmacologìa, Facultad de Veterinaria, 27002 Lugo, Spain
| | - A G Cabado
- Departamento de Fisiologìa, Facultad de Veterinaria, 27002 Lugo, Spain
| | - M R Vieytes
- Departamento de Fisiologìa, Facultad de Veterinaria, 27002 Lugo, Spain
| | - L M Botana
- Departamento de Farmacologìa, Facultad de Veterinaria, 27002 Lugo, Spain
- Author for correspondence:
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13
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Vilariño N, Vieytes MR, Vieites JM, Botana LM. Modulatory effect of HCO3- on rat mast cell exocytosis: cross-talks between bicarbonate and calcium. Biochem Biophys Res Commun 1999; 260:71-9. [PMID: 10381346 DOI: 10.1006/bbrc.1999.0853] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
HCO-3 modulation of histamine release and its relationship with the Ca2+ signal were studied in serosal rat mast cells. Histamine release was induced by Ca2+ mobilizing stimuli, namely compound 48/80, thapsigargin, Ca2+ chelators, ionophore A23187, and PMA and ionophore A23187 in a HCO-3-buffered medium or a HCO-3-free medium. The presence of HCO-3 reduced histamine release by 48/80, Ca2+ chelators, A23187, and PMA/A23187, but increased histamine release induced by thapsigargin. Histamine release by PMA was significantly higher in a HCO-3-free medium than in a HCO-3-free medium, as it was the PMA potentiation of histamine release by A23187. [Ca2+]i changes induced by these drugs were measured in fura-2-loaded mast cells. In thapsigargin and EGTA or BAPTA preincubated mast cells [Ca2+]i increase was higher in a HCO-3-buffered medium than in a HCO-3-free medium in the presence of Ca2+. On the contrary, in compound 48/80 and PMA/A23187 activated mast cells the [Ca2+]i increase is the same both in the presence and in the absence of HCO-3. The effect of HCO-3 on histamine release in serosal rat mast cells depends on the stimulus, but it is not related to the presence of Cl-. In thapsigargin-stimulated mast cells the effect of HCO-3 on histamine release may be related to the Ca2+ signal, but in compound 48/80, EGTA, and PMA/A23187-activated mast cells there is no relationship between intracellular Ca2+ and the inhibitory effect of HCO-3 on histamine release. Additionally, the PKC pathway is implicated in the inhibitory effect of HCO-3 on histamine release, the higher the chelation of calcium rendering the higher the enhancement of the response after adding calcium in the absence of HCO-3.
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Affiliation(s)
- N Vilariño
- Facultad de Veterinaria, Universidad Santiago de Compostela, 27002 Lugo
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