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Bao C, Abraham SN. Mast cell-sensory neuron crosstalk in allergic diseases. J Allergy Clin Immunol 2024; 153:939-953. [PMID: 38373476 PMCID: PMC10999357 DOI: 10.1016/j.jaci.2024.02.005] [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: 06/15/2023] [Revised: 01/12/2024] [Accepted: 02/14/2024] [Indexed: 02/21/2024]
Abstract
Mast cells (MCs) are tissue-resident immune cells, well-positioned at the host-environment interface for detecting external antigens and playing a critical role in mobilizing innate and adaptive immune responses. Sensory neurons are afferent neurons innervating most areas of the body but especially in the periphery, where they sense external and internal signals and relay information to the brain. The significance of MC-sensory neuron communication is now increasingly becoming recognized, especially because both cell types are in close physical proximity at the host-environment interface and around major organs of the body and produce specific mediators that can activate each other. In this review, we explore the roles of MC-sensory neuron crosstalk in allergic diseases, shedding light on how activated MCs trigger sensory neurons to initiate signaling in pruritus, shock, and potentially abdominal pain in allergy, and how activated sensory neurons regulate MCs in homeostasis and atopic dermatitis associated with contact hypersensitivity and type 2 inflammation. Throughout the review, we also discuss how these 2 sentinel cell types signal each other, potentially resulting in a positive feedback loop that can sustain inflammation. Unraveling the mysteries of MC-sensory neuron crosstalk is likely to unveil their critical roles in various disease conditions and enable the development of new therapeutic approaches to combat these maladies.
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Affiliation(s)
- Chunjing Bao
- Department of Pathology, Duke University Medical Center, Durham, NC
| | - Soman N Abraham
- Department of Pathology, Duke University Medical Center, Durham, NC; Department of Immunology, Duke University Medical Center, Durham, NC; Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC; Department of Program in Emerging Infectious Diseases, Duke-National University of Singapore, Singapore, Singapore.
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Kay AB, Ying S, Ardelean E, Mlynek A, Kita H, Clark P, Maurer M. Calcitonin gene-related peptide and vascular endothelial growth factor are expressed in lesional but not uninvolved skin in chronic spontaneous urticaria. Clin Exp Allergy 2015; 44:1053-60. [PMID: 24902612 DOI: 10.1111/cea.12348] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 04/21/2014] [Accepted: 05/14/2014] [Indexed: 11/28/2022]
Abstract
BACKGROUND The mechanisms for producing weals in chronic spontaneous (idiopathic) urticaria (CSU) are incompletely understood. Leucocyte infiltration with vascular leakage and expression of the potent vasoactive agents' calcitonin gene-related peptide (CGRP) and vascular endothelial growth factor (VEGF) are features of late-phase allergic skin reactions, previously proposed as a model of CSU. OBJECTIVE To measure CGRP and VEGF expression in lesional and non-lesional skin from CSU patients and to compare results with a control group. METHODS Eight paired biopsies (one from 4-8 h spontaneous weals and one from uninvolved skin) were taken from eight patients with CSU and nine control subjects and studied by immunohistochemistry and confocal microscopy. RESULTS Lesional skin in CSU contained significantly more CGRP+ and VEGF+ cells than non-lesional skin. No significant differences were observed in CGRP and VEGF expression between non-lesional skin and controls. In lesional skin, VEGF and CGRP co-localised to UEA-1+ blood vessels. CGRP was also expressed by neutrophils and eosinophils and to a lesser extent by CD90(+) fibroblasts, mast cells, CD3(+) and CD68(+) cells. CGRP and VEGF expression was not related to the duration of disease. CONCLUSION AND CLINICAL RELEVANCE Increased expression of CGRP and VEGF in lesional, but not uninvolved, skin indicates that these potent vasoactive agents may play a role in wealing and tissue oedema in CSU so representing novel targets in therapy.
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Affiliation(s)
- A B Kay
- Leukocyte Biology Section, National Heart & Lung Institute, Imperial College London, London, UK
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Li FJ, Zou YY, Cui Y, Yin Y, Guo G, Lu FG. Calcitonin gene-related peptide is a promising marker in ulcerative colitis. Dig Dis Sci 2013; 58:686-93. [PMID: 23010746 DOI: 10.1007/s10620-012-2406-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Accepted: 09/06/2012] [Indexed: 01/15/2023]
Abstract
BACKGROUND Assessment of the severity and extent of disease activity continues to present challenges for physicians in the treatment of ulcerative colitis. Standard markers that can objectively reflect disease activity are useful for physicians to both evaluate the course of ulcerative colitis and monitor the effectiveness of therapy for any given patient. AIMS We hypothesize that calcitonin gene-related peptide (CGRP) can reflect the activity and severity of ulcerative colitis and be used as a marker to assess the effectiveness of various therapies. METHODS We examined the expression levels of CGRP by reverse transcription polymerase chain reaction (RT-PCR) and semi-quantitative immunohistochemisty in mucosal biopsies from 38 patients with UC and 18 controls. Levels of CGRP mRNA and protein expression were compared between patients and controls with the clinical activity index (CAI) and the endoscopic activity index (EAI) for various levels of UC severity. RESULTS Our results showed that the levels of CGRP mRNA and protein expression were significantly reduced in UC patients compared to controls. This effect was more pronounced in patients with more severe cases of UC. There is a statistically significant negative correlation between levels of CGRP mRNA expression and CAI/EAI scores. A statistically significant negative correlation was also found between levels of CGRP protein expression and CAI/EAI scores. Overall, high CAI and EAI scores were accompanied by low CGRP mRNA and protein expression levels. CONCLUSION Levels of CGRP protein and mRNA expression in the colonic mucosa of patients are closely associated with UC severity and corroborate traditional indices used to assess the disease.
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Affiliation(s)
- Fu-Jun Li
- Department of Gastroenterology, 2nd Xiangya Hospital, Central South University, Changsha, 410008, China
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Shimizu S, Brown M, Sengupta R, Penfold ME, Meucci O. CXCR7 protein expression in human adult brain and differentiated neurons. PLoS One 2011; 6:e20680. [PMID: 21655198 PMCID: PMC3105114 DOI: 10.1371/journal.pone.0020680] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Accepted: 05/07/2011] [Indexed: 01/22/2023] Open
Abstract
Background CXCR7 and CXCR4 are receptors for the chemokine CXCL12, which is involved in
essential functions of the immune and nervous systems. Although
CXCR7 transcripts are widely expressed throughout the
central nervous system, little is known about its protein distribution and
function in the adult brain. To evaluate its potential involvement in
CXCL12/CXCR4 signaling in differentiated neurons, we studied CXCR7 protein
expression in human brain and cultured neurons. Methodology/Principal Findings Immunohistochemistry and RT-PCR analyses of cortex and hippocampus from
control and HIV-positive subjects provided the first evidence of CXCR7
protein expression in human adult neurons, under normal and pathological
conditions. Furthermore, confocal microscopy and binding assays in cultured
neurons show that CXCR7 protein is mainly located into cytoplasm, while
little to no protein expression is found on neuronal plasma membrane.
Interestingly, specific CXCR7 ligands that inhibit CXCL12 binding to CXCR7
do not alter CXCR4-activated survival signaling (pERK/pAkt) in rat cortical
neurons. Neuronal CXCR7 co-localizes to some extent with the endoplasmic
reticulum marker ERp29, but not with early/late endosome markers.
Additionally, large areas of overlap are detected in the intracellular
pattern of CXCR7 and CXCR4 expression. Conclusions/Significance Overall, these results implicate CXCR4 as the main CXCL12 signaling receptor
on the surface of differentiated neurons and suggest that CXCR7 may interact
with CXCR4 at the intracellular level, possibly affecting CXCR4 trafficking
and/or coupling to other proteins.
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Affiliation(s)
- Saori Shimizu
- Department of Pharmacology and Physiology, Drexel University College of
Medicine, Philadelphia, Pennsylvania, United States of America
| | - Michael Brown
- Department of Pharmacology and Physiology, Drexel University College of
Medicine, Philadelphia, Pennsylvania, United States of America
| | - Rajarshi Sengupta
- Department of Pharmacology and Physiology, Drexel University College of
Medicine, Philadelphia, Pennsylvania, United States of America
| | - Mark E. Penfold
- ChemoCentryx, Mountain View, California, United States of
America
| | - Olimpia Meucci
- Department of Pharmacology and Physiology, Drexel University College of
Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Microbiology and Immunology, Drexel University College of
Medicine, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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Rychter JW, Van Nassauw L, Timmermans JP, Akkermans LMA, Westerink RHS, Kroese ABA. CGRP1 receptor activation induces piecemeal release of protease-1 from mouse bone marrow-derived mucosal mast cells. Neurogastroenterol Motil 2011; 23:e57-68. [PMID: 20964790 DOI: 10.1111/j.1365-2982.2010.01617.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND The parasitized or inflamed gastrointestinal mucosa shows an increase in the number of mucosal mast cells (MMC) and the density of extrinsic primary afferent nerve fibers containing the neuropeptide, calcitonin gene-related peptide (CGRP). Currently, the mode of action of CGRP on MMC is unknown. METHODS The effects of CGRP on mouse bone marrow-derived mucosal mast cells (BMMC) were investigated by measurements of intracellular Ca(2+)[Ca(2+)](i) and release of mMCP-1. KEY RESULTS Bone marrow-derived mucosal mast cells responded to the application of CGRP with a single transient rise in [Ca(2+)](i). The proportion of responding cells increased concentration-dependently to a maximum of 19 ± 4% at 10(-5)mol L(-1) (mean ±SEM; C48/80 100%; EC(50)10(-8) mol L(-1) ). Preincubation with the CGRP receptor antagonist BIBN4096BS (10(-5) mol L(-1)) completely inhibited BMMC activation by CGRP [range 10(-5) to 10(-11) mol L(-1); analysis of variance (ANOVA) P < 0.001], while preincubation with LaCl(3) to block Ca(2+) entry did not affect the response (P = 0.18). The presence of the CGRP1 receptor on BMMC was confirmed by simultaneous immunofluorescent detection of RAMP1 or CRLR, the two components of the CGRP1 receptor, and mMCP-1. Application of CGRP for 1 h evoked a concentration-dependent release of mMCP-1 (at EC(50) 10% of content) but not of β-hexosaminidase and alterations in granular density indicative of piecemeal release. CONCLUSIONS & INFERENCES We demonstrate that BMMC express functional CGRP1 receptors and that their activation causes mobilization of Ca(2+) from intracellular stores and piecemeal release of mMCP-1. These findings support the hypothesis that the CGRP signaling from afferent nerves to MMC in the gastrointestinal wall is receptor-mediated.
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Affiliation(s)
- J W Rychter
- Institute for Risk Assessment Sciences, Utrecht University, Utrecht, The Netherlands
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Kono T, Koseki T, Chiba S, Ebisawa Y, Chisato N, Iwamoto J, Kasai S. Colonic vascular conductance increased by Daikenchuto via calcitonin gene-related peptide and receptor-activity modifying protein 1. J Surg Res 2008; 150:78-84. [PMID: 18561951 DOI: 10.1016/j.jss.2008.02.057] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 02/21/2008] [Accepted: 02/25/2008] [Indexed: 01/17/2023]
Abstract
BACKGROUND Daikencyuto (DKT) is a traditional Japanese medicine (Kampo) and is a mixture of extract powders from dried Japanese pepper, processed ginger, ginseng radix, and maltose powder and has been used as the treatment of paralytic ileus. DKT may increase gastrointestinal motility by an up-regulation of the calcitonin gene-related peptide (CGRP). CGRP is also the most powerful vasoactive substance. In the present study, we investigated whether DKT has any effect on the colonic blood flow in rats. MATERIALS AND METHODS Experiments were performed on fasted anesthetized and artificially ventilated Wistar rats. Systemic mean arterial blood pressure and heart rate were recorded. Red blood cell flux in colonic blood flow was measured using noncontact laser tissue blood flowmetry, and colonic vascular conductance (CVC) was calculated as the ratio of flux to mean arterial blood pressure. We examined four key physiological mechanisms underlying the response using blocker drugs: CGRP1 receptor blocker (CGRP(8-37)), nitric oxide synthase inhibitor, vasoactive intestinal polypeptide (VIP) receptor blocker ([4-Cl-DPhe6, Leu17]-VIP), and substance P receptor blocker (spantide). Reverse transcription-polymerase chain reaction was used for the detection of mRNA of calcitonin receptor-like receptor, receptor-activity modifying protein 1, the component of CGRP 1 receptor and CGRP. After laparotomy, a cannula was inserted into the proximal colon to administer the DKT and to measure CVC at the distal colon. RESULTS Intracolonal administration of DKT (10, 100, and 300 mg/kg) increased CVC (basal CVC, 0.10 mL/mmHg) from the first 15-min observation period (0.14, 0.17, and 0.17 mL/mmHg, respectively) and with peak response at either 45 min (0.17 mL/mmHg by 10 mg/kg), or 75 and 60 min (0.23 and 0.21 mL/mmHg by 100 and 300 mg/kg, respectively). CGRP(8-37) completely abolished the DKT-induced hyperemia, whereas nitric oxide synthase inhibitor partially attenuated the DKT-induced hyperemia. [4-Cl-DPhe6, Leu17]-VIP and spantide did not affect the hyperemia. Japanese pepper significantly increased CVC at 45 min or later, whereas ginseng radix only showed a significant increase at 15 min. Reverse transcription-polymerase chain reaction showed that mRNA for calcitonin receptor-like receptor, receptor-activity modifying protein 1, and CGRP were expressed in rat colon and up-regulated by DKT. CONCLUSIONS The present study demonstrated that DKT increased CVC, which was mainly mediated by CGRP and its receptor components.
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Affiliation(s)
- Toru Kono
- Division of Gastroenterologic and General Surgery, Department of Surgery, Asahikawa Medical College, Hokkaido, Japan.
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Wang J, Qiu X, Kulkarni A, Hauer-Jensen M. Calcitonin gene-related peptide and substance P regulate the intestinal radiation response. Clin Cancer Res 2007; 12:4112-8. [PMID: 16818712 DOI: 10.1158/1078-0432.ccr-06-0592] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Intestinal toxicity is important in the therapeutic use of radiation as well as in nontherapeutic radiation exposure scenarios. Enteric sensory nerves are critical for mucosal homeostasis and for an appropriate response to injury. This study assessed the role of the two major neuropeptides released by sensory nerves, calcitonin gene-related peptide (CGRP) and substance P, in the intestinal radiation response. EXPERIMENTAL DESIGN Male rats received full-length CGRP, CGRP antagonist (CGRP(8-37)), a modified substance P peptide (GR73632), a small-molecule substance P receptor antagonist (neurokinin-1 receptor antagonist, SR140333), or vehicle for 2 weeks after localized X irradiation of a 4-cm loop of small bowel. Structural, cellular, and molecular aspects of the intestinal radiation response were assessed. RESULTS Intestinal CGRP and substance P transcript levels increased after irradiation. Multivariate analysis showed that CGRP and SR140333 ameliorated and CGRP(8-37) and GR73632 exacerbated intestinal radiation injury. Univariate analysis revealed increased radiation injury score, bowel wall thickening, and collagen III deposition after treatment with CGRP(8-37), whereas SR140333 ameliorated radiation injury score, loss of mucosal surface area, collagen III deposition, and mucosal inflammation. CONCLUSIONS The two major neuropeptides released by sensory neurons, CGRP and substance P, are overexpressed after irradiation and have opposing effects during development of intestinal radiation injury. Systematic studies to assess CGRP agonists and/or neurokinin-1 receptor blockers as protectors against intestinal toxicity during radiation therapy and after nontherapeutic radiation exposure are warranted.
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Affiliation(s)
- Junru Wang
- Arkansas Cancer Research Center, Little Rock, Arkansas 72205, USA
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Kulka M, Sheen CH, Tancowny BP, Grammer LC, Schleimer RP. Neuropeptides activate human mast cell degranulation and chemokine production. Immunology 2007; 123:398-410. [PMID: 17922833 DOI: 10.1111/j.1365-2567.2007.02705.x] [Citation(s) in RCA: 314] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
During neuronal-induced inflammation, mast cells may respond to stimuli such as neuropeptides in an FcepsilonRI-independent manner. In this study, we characterized human mast cell responses to substance P (SP), nerve growth factor (NGF), calcitonin gene-related peptide (CGRP) and vasoactive intestinal polypeptide (VIP) and compared these responses to human mast cell responses to immunoglobulin E (IgE)/anti-IgE and compound 48/80. Primary cultured mast cells, generated from CD34(+) progenitors in the presence of stem cell factor and interleukin-6 (IL-6), and human cultured mast cells (LAD2) were stimulated with these and other stimuli (gastrin, concanavalin A, radiocontrast media, and mannitol) and their degranulation and chemokine production was assessed. VIP and SP stimulated primary human mast cells and LAD cells to degranulate; gastrin, concanavalin A, radiocontrast media, mannitol, CGRP and NGF did not activate degranulation. While anti-IgE stimulation did not induce significant production of chemokines, stimulation with VIP, SP or compound 48/80 potently induced production of monocyte chemoattractant protein-1, inducible protein-10, monokine induced by interferon-gamma (MIG), RANTES (regulated on activation, normal, T-cell expressed, and secreted) and IL-8. VIP, SP and compound 48/80 also activated release of tumour necrosis factor, IL-3 and granulocyte-macrophage colony-stimulating factor, but not IL-4, interferon-gamma or eotaxin. Human mast cells expressed surface neurokinin 1 receptor (NK1R), NK2R, NK3R and VIP receptor type 2 (VPAC2) but not VPAC1 and activation of human mast cells by IgE/anti-IgE up-regulated expression of VPAC2, NK2R, and NK3R. These studies demonstrate the pattern of receptor expression and activation of mast cell by a host of G-protein coupled receptor ligands and suggest that SP and VIP activate a unique signalling pathway in human mast cells. These results are likely to have direct relevance to neuronally induced inflammatory diseases.
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Affiliation(s)
- Marianna Kulka
- National Research Council Canada, Room 432, 550 University Avenue, Charlottetown, PE, Canada.
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Joachim RA, Kuhlmei A, Dinh QT, Handjiski B, Fischer T, Peters EMJ, Klapp BF, Paus R, Arck PC. Neuronal plasticity of the “brain–skin connection”: stress-triggered up-regulation of neuropeptides in dorsal root ganglia and skin via nerve growth factor-dependent pathways. J Mol Med (Berl) 2007; 85:1369-78. [PMID: 17639286 DOI: 10.1007/s00109-007-0236-8] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2007] [Revised: 04/30/2007] [Accepted: 05/29/2007] [Indexed: 10/23/2022]
Abstract
Emerging research indicates that central-nervous stress perception is translated to peripheral tissues such as the skin not only via classical stress hormones but also via neurotrophins and neuropeptides. This can result in neurogenic inflammation, which is likely to contribute to the triggering and/aggravation of immunodermatoses. Although the existence of such a "brain-skin connection" is supported by steadily increasing experimental evidence, it remains unclear to which extent perceived stress affects the sensory "hardwiring" between skin and its afferent neurons in the corresponding dorsal root ganglia (DRG). In this paper, we provide experimental evidence in a murine model of stress (exposure of C57BL/6 mice to sound stress) that stress exposure, or intracutaneous injection of recombinant nerve growth factor (NGF) to mimic the skin's response to stress, up-regulate the percentage of substance P (SP)+ or calcitonin gene-related peptide (CGRP)+ sensory neurons in skin-innervating DRG. Further, we show that the number of SP+ or CGRP+ sensory nerve fibers in the dermis of stressed C57BL/6 mice is significantly increased. Finally, we document that neutralization of NGF activity abrogates stress-induced effects on the percentage of SP+ and CGRP+ sensory neurons in skin-innervating DRG as well as on dermal sensory nerve fibers. These data suggest that high stress perception results in an intense cross talk between the skin and skin-innervating DRG, which increases the likelihood of NGF-dependent neurogenic skin inflammation by enhancing sensory skin innervation.
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Affiliation(s)
- Ricarda A Joachim
- Center of Internal Medicine and Dermatology, Charité, University Medicine Berlin, Campus Virchow, Berlin, Germany
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Van Nassauw L, Adriaensen D, Timmermans JP. The bidirectional communication between neurons and mast cells within the gastrointestinal tract. Auton Neurosci 2006; 133:91-103. [PMID: 17169619 DOI: 10.1016/j.autneu.2006.10.003] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Revised: 09/26/2006] [Accepted: 10/10/2006] [Indexed: 12/12/2022]
Abstract
Normal or disordered behaviour of the gastrointestinal tract is determined by a complex interplay between the epithelial barrier, immune cells, blood vessels, smooth muscle and intramurally located nerve elements. Mucosal mast cells (MMCs), which are able to detect noxious and antigenic threats and to generate or amplify signals to the other cells, are assigned a rather central position in this complex network. Signal input from MMCs to intrinsic enteric neurons is particularly crucial, because the enteric nervous system fulfils a pivotal role in the control of gastrointestinal functions. Activated enteric neurons are able to generate an alarm program involving alterations in motility and secretion. MMC signalling to extrinsic nerve fibres takes part in pathways generating visceral pain or extrinsic reflexes contributing to the disturbed motor and secretory function. Morphological and functional studies, especially studies concerning physiological stress, have provided evidence that, apart from the interaction between the enteric nervous system and MMCs, there is also a functional communication between the central nervous system and these mast cells. Psychological factors trigger neuronal pathways, which directly or indirectly affect MMCs. Further basic and clinical research will be needed to clarify in more detail whether basic patterns of this type of interactions are conserved between species including humans.
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Affiliation(s)
- Luc Van Nassauw
- Research Group Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Belgium
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Yamashita M. Peroxisome proliferator-activated receptor alpha-independent effects of peroxisome proliferators on cysteinyl leukotriene production in mast cells. Eur J Pharmacol 2006; 556:172-80. [PMID: 17113579 DOI: 10.1016/j.ejphar.2006.10.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Revised: 10/06/2006] [Accepted: 10/10/2006] [Indexed: 11/15/2022]
Abstract
The effects of peroxisome proliferators, the ligands of a nuclear receptor peroxisome proliferator-activated receptor (PPAR) alpha, on cysteinyl leukotriene production were investigated in rodent mast cells. Peroxisome proliferators Wy-14,643 (30 microM) and fenofibrate (100 microM) significantly inhibited the cysteinyl leukotriene production that was induced by antigen (Ag) treatment after overnight sensitization to Ag specific immunoglobulin E (IgE) in a rat basophilic leukemia (RBL)-2H3 mast cell line. Similar inhibition by these drugs was observed in IgE and Ag-treated mouse bone marrow-derived mast cells, A23187-treated RBL-2H3 and A23187-treated mouse peritoneal macrophages. Wy-14,643 (30 microM) and fenofibrate (100 microM) did not affect the release of radioactivity from RBL-2H3 pre-incubated with [(3)H]-arachidonic acid, which is considered an index of phospholipase A(2) activity. Wy-14,643 (30 microM) and fenofibrate (100 microM) did not directly inhibit 5-lipoxygenase activity. Troglitazone was found to directly inhibit the activity of 5-lipoxygenase. The PPARalpha mRNA level was at less than the limit of detection for the realtime polymerase chain reaction both in RBL-2H3 and bone marrow-derived mast cells. Wy-14,643 (30 microM) and fenofibrate (100 microM) did not induce acyl-CoA oxidase mRNA in RBL-2H3, which was reported to be induced by peroxisome proliferators via PPARalpha in hepatocytes. Wy-14,643 (30 microM) and fenofibrate (100 microM) inhibited the cysteinyl leukotriene production in bone marrow-derived mast cells from PPARalpha-null mice. It was concluded that the inhibitory effects of these peroxisome proliferators on cysteinyl leukotriene production are independent of PPARalpha in mast cells.
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Affiliation(s)
- Masamichi Yamashita
- Department of Pathophysiology, Tohoku Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, Miyagi 981-8558, Japan.
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Okuyama K, Yamashita M, Kitabatake Y, Kawamura S, Takayanagi M, Ohno I. Ciglitazone inhibits the antigen-induced leukotrienes production independently of PPARgamma in RBL-2H3 mast cells. Eur J Pharmacol 2005; 521:21-8. [PMID: 16171799 DOI: 10.1016/j.ejphar.2005.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2005] [Accepted: 08/05/2005] [Indexed: 11/22/2022]
Abstract
Peroxisome prolifelator-activated receptor gamma (PPARgamma) is a ligand-activated transcription factor, through which PPARgamma agonists have been demonstrated to down-regulate inflammatory cell functions. Recently, the agonists are reported to exert, in some conditions, their inhibitory actions independently of PPARgamma. Previously, we showed that a PPARgamma agonist, troglitazone, inhibited cysteinyl (Cys)-leukotrienes production in RBL-2H3 cells after IgE receptor triggering. Here we examined whether the inhibition of cycteinyl-leukotrienes production in the cells was dependent on the activation of PPARgamma. A PPARgamma agonist, ciglitazone, significantly inhibited Cys-leukotrienes, but not prostaglandin D2, production. The inhibition was not attenuated by the pretreatment with a PPARgamma antagonist. Ciglitazone did not alter the mRNA expression of acyl-coenzyme A binding protein, the gene expression of which is up-regulated by PPARgamma, nor induce the nucleus translocation of PPARgamma. These results suggest that the inhibition by PPARgamma agonists of Cys-leukotrienes production in RBL-2H3 cells after IgE receptor triggering is not through the activation of PPARgamma.
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Affiliation(s)
- Kaori Okuyama
- Department of Pathophysiology, Tohoku Pharmaceutical University, 4-4-1 Komatsushima, Sendai 981-8558, Japan
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