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Pérez-Montalbán M, García-Domínguez E, Oliva-Pascual-Vaca Á. Subdiaphragmatic phrenic nerve supply: A systematic review. Ann Anat 2024; 254:152269. [PMID: 38692333 DOI: 10.1016/j.aanat.2024.152269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/18/2024] [Accepted: 04/23/2024] [Indexed: 05/03/2024]
Abstract
OBJECTIVE The aim of this systematic review is to study the subdiaphragmatic anatomy of the phrenic nerve. MATERIALS AND METHODS A computerised systematic search of the Web of Science database was conducted. The key terms used were phrenic nerve, subdiaphragmat*, esophag*, liver, stomach, pancre*, duoden*, intestin*, bowel, gangli*, biliar*, Oddi, gallbladder, peritone*, spleen, splenic, hepat*, Glisson, falciform, coronary ligament, kidney, suprarenal, and adrenal. The 'cited-by' articles were also reviewed to ensure that all appropriate studies were included. RESULTS A total of one thousand three hundred and thirty articles were found, of which eighteen met the inclusion and exclusion criteria. The Quality Appraisal for Cadaveric Studies scale revealed substantial to excellent methodological quality of human studies, while a modified version of the Systematic Review Centre for Laboratory Animal Experimentation Risk of Bias Tool denoted poor methodological quality of animal studies. According to human studies, phrenic supply has been demonstrated for the gastro-esophageal junction, stomach, celiac ganglia, liver and its coronary ligament, inferior vena cava, gallbladder and adrenal glands, with half of the human samples studied presenting phrenic nerve connections with any subdiaphragmatic structure. CONCLUSIONS This review provides the first systematic evidence of subdiaphragmatic phrenic nerve supply and connections. This is of interest to professionals who care for people suffering from neck and shoulder pain, as well as patients with peridiaphragmatic disorders or hiccups. However, there are controversies about the autonomic or sensory nature of this supply.
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Affiliation(s)
- María Pérez-Montalbán
- Universidad de Sevilla. Facultad de Enfermería, Fisioterapia y Podología, Departamento de Fisioterapia, Spain
| | | | - Ángel Oliva-Pascual-Vaca
- Instituto de Biomedicina de Sevilla, IBiS, Departamento de Fisioterapia, Universidad de Sevilla, Spain; Escuela de Osteopatía de Madrid, Madrid, Spain.
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2
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Liu T, Asif IM, Liu L, Zhang M, Li B, Wang L. Laminarin ameliorates iodoacetamide-induced functional dyspepsia via modulation of 5-HT 3 receptors and the gut microbiota. Int J Biol Macromol 2024; 268:131640. [PMID: 38636750 DOI: 10.1016/j.ijbiomac.2024.131640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 04/08/2024] [Accepted: 04/14/2024] [Indexed: 04/20/2024]
Abstract
Visceral and somatic hypersensitivity is a common cause of functional dyspepsia. Marine bioactive components have been revealed to possess numerous valuable abilities. However, as a kind of polysaccharide extracted from brown algae, the study focused on the biological properties of laminarin is still limited, especially in gastrointestinal disorders. In our study, indicators associated with visceral sensational function and gastrointestinal microecology were determined to investigate the modulatory effects of laminarin on functional dyspepsia induced by iodoacetamide. Mice with visceral hypersensitivity were orally administrated with laminarin (50 and 100 mg per kg bw) for fourteen days. The results indicated that laminarin partly alleviated the dysfunction by regulating corticosterone secretion, the expression of 5HT3 receptors at both protein and mRNA levels, and mechanical transduction through the PIEZO2-EPAC1 axis. Furthermore, laminarin administration moderated the imbalanced gut microbial profile, including modulating the abundance of Bacteroidetes and Firmicutes. Our findings revealed that laminarin may restore the overexpression of 5HT3 receptors, the abnormal mechanical transduction, and impaired gut microecology. In conclusion, we provide evidence to support the utilization of laminarin as the ingredient of complementary and alternative medicine of regulating visceral and somatic hypersensitivity.
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Affiliation(s)
- Tianxu Liu
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology Huazhong Agricultural University, Ministry of Education, Wuhan, 430070, Hubei, China.
| | - Ismail Muhammad Asif
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology Huazhong Agricultural University, Ministry of Education, Wuhan, 430070, Hubei, China.
| | - Lichong Liu
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology Huazhong Agricultural University, Ministry of Education, Wuhan, 430070, Hubei, China.
| | - Minghui Zhang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology Huazhong Agricultural University, Ministry of Education, Wuhan, 430070, Hubei, China.
| | - Bin Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology Huazhong Agricultural University, Ministry of Education, Wuhan, 430070, Hubei, China.
| | - Ling Wang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology Huazhong Agricultural University, Ministry of Education, Wuhan, 430070, Hubei, China.
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3
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Guo Y, Gharibani P. Analgesic Effects of Vagus Nerve Stimulation on Visceral Hypersensitivity: A Direct Comparison Between Invasive and Noninvasive Methods in Rats. Neuromodulation 2024; 27:284-294. [PMID: 37191611 DOI: 10.1016/j.neurom.2023.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 03/20/2023] [Accepted: 04/10/2023] [Indexed: 05/17/2023]
Abstract
OBJECTIVES The aims of this study were to investigate analgesic effects of vagus nerve stimulation (VNS) on visceral hypersensitivity (VH) in a rodent model of functional dyspepsia (FD) and to compare invasive VNS with noninvasive auricular VNS (aVNS). MATERIALS AND METHODS Eighteen ten-day-old male rats were gavaged with 0.1% iodoacetamide (IA) or 2% sucrose solution for six days. After eight weeks, IA-treated rats were implanted with electrodes for VNS or aVNS (n = 6 per group). Different parameters, varying in frequency and stimulation duty cycle, were tested to find the best parameter based on the improvement of VH assessed by electromyogram (EMG) during gastric distension. RESULTS Compared with sucrose-treated rats, visceral sensitivity was increased significantly in IA-treated "FD" rats and ameliorated remarkably by VNS (at 40, 60, and 80 mm Hg; p ≤ 0.02, respectively) and aVNS (at 60 and 80 mm Hg; p ≤ 0.05, respectively) with the parameter of 100 Hz and 20% duty cycle. There was no significant difference in area under the curve of EMG responses between VNS and aVNS (at 60 and 80 mm Hg, both p > 0.05). Spectral analysis of heart rate variability revealed a significant enhancement in vagal efferent activity while applying VNS/aVNS compared with sham stimulation (p < 0.01). In the presence of atropine, no significant differences were noted in EMG after VNS/aVNS. Naloxone blocked the analgesic effects of VNS/aVNS. CONCLUSIONS VNS/aVNS with optimized parameter elicits ameliorative effects on VH, mediated by autonomic and opioid mechanisms. aVNS is as effective as direct VNS and has great potential for treating visceral pain in patients with FD.
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Affiliation(s)
- Yu Guo
- Division of Gastroenterology and Hepatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Payam Gharibani
- Division of Gastroenterology and Hepatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Neurology, Division of Neuroimmunology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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4
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Zhang S, Chen L, Feng B. An anesthesia protocol for robust and repeatable measurement of behavioral visceromotor responses to colorectal distension in mice. FRONTIERS IN PAIN RESEARCH 2023; 4:1202590. [PMID: 37305203 PMCID: PMC10250638 DOI: 10.3389/fpain.2023.1202590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 05/10/2023] [Indexed: 06/13/2023] Open
Abstract
Introduction Visceral motor responses (VMR) to graded colorectal distension (CRD) have been extensively implemented to assess the level of visceral pain in awake rodents, which are inevitably confounded by movement artifacts and cannot be conveniently implemented to assess invasive neuromodulation protocols for treating visceral pain. In this report, we present an optimized protocol with prolonged urethane infusion that enables robust and repeatable recordings of VMR to CRD in mice under deep anesthesia, providing a two-hour window to objectively assess the efficacy of visceral pain management strategies. Methods During all surgical procedures, C57BL/6 mice of both sexes (8-12 weeks, 25-35 g) were anesthetized with 2% isoflurane inhalation. An abdominal incision was made to allow Teflon-coated stainless steel wire electrodes to be sutured to the oblique abdominal musculature. A thin polyethylene catheter (Φ 0.2 mm) was placed intraperitoneally and externalized from the abdominal incision for delivering the prolonged urethane infusion. A cylindric plastic-film balloon (Φ 8 mm x 15 mm when distended) was inserted intra-anally, and its depth into the colorectum was precisely controlled by measuring the distance between the end of the balloon and the anus. Subsequently, the mouse was switched from isoflurane anesthesia to the new urethane anesthesia protocol, which consisted of a bout of infusion (0.6 g urethane per kg weight, g/kg) administered intraperitoneally via the catheter and continuous low-dose infusion throughout the experiment at 0.15-0.23 g per kg weight per hour (g/kg/h). Results Using this new anesthesia protocol, we systematically investigated the significant impact of balloon depth into the colorectum on evoked VMR, which showed a progressive reduction with increased balloon insertion depth from the rectal region into the distal colonic region. Intracolonic TNBS treatment induced enhanced VMR to CRD of the colonic region (>10 mm from the anus) only in male mice, whereas colonic VMR was not significantly altered by TNBS in female mice. Discussion Conducting VMR to CRD in anesthetized mice using the current protocol will enable future objective assessments of various invasive neuromodulatory strategies for alleviating visceral pain.
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Affiliation(s)
| | | | - Bin Feng
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, United States
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5
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Duan S, Imamura N, Kondo T, Kanda H, Kogure Y, Okugawa T, Fukushima M, Tomita T, Oshima T, Fukui H, Noguchi K, Dai Y, Miwa H. Yokukansan Suppresses Gastric Hypersensitivity and Eosinophil-associated Microinflammation in Rats With Functional Dyspepsia. J Neurogastroenterol Motil 2022; 28:255-264. [PMID: 35362452 PMCID: PMC8978130 DOI: 10.5056/jnm21204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 01/06/2022] [Accepted: 01/18/2022] [Indexed: 11/20/2022] Open
Abstract
Background/Aims Herbal medicine is an important complementary therapy for functional dyspepsia (FD). However, its effect against gastric hypersensitivity in patients with FD has rarely been evaluated. Yokukansan (YKS), a traditional Japanese herbal medicine, is effective against neuropathic and inflammatory pain. This study aims to use a maternal separation (MS) stress-induced FD model to investigate the effects of YKS against gastric hypersensitivity, gastric motility, and duodenal micro-inflammation. Methods The MS stress model was established by separating newborn Sprague-Dawley rats from their mothers for 2 hours a day from postnatal days 1 to 10. At the age of 7-8 weeks, the rats were treated with YKS at a dose of 5 mL/kg (1 g/kg) for 7 consecutive days. After YKS treatment, electromyographic activity in the acromiotrapezius muscle by gastric distention and the gastric-emptying rate were assessed. Immunohistochemical analysis of eosinophils in the duodenum and phosphorylated extracellular signal-regulated kinase (p-ERK) 1/2 in the spinal cord was performed. Results YKS treatment suppressed MS stress-induced gastric hypersensitivity and decreased the elevated levels of p-ERK1/2 in the spinal cord. In the gastroduodenal tract, YKS inhibited eosinophil-associated micro-inflammation but did not improve gastric dysmotility. Conclusions YKS treatment improved gastric hypersensitivity by alleviating eosinophil-associated micro-inflammation in the gastroduodenal tract. This treatment may be considered an effective therapeutic option for epigastric pain and micro-inflammation in patients with FD.
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Affiliation(s)
- Shaoqi Duan
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan.,Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan
| | - Nobuko Imamura
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Takashi Kondo
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Hirosato Kanda
- Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan.,Department of Anatomy and Neuroscience, Hyogo College of Medicine, Nishinomiya, Japan
| | - Yoko Kogure
- Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan
| | - Takuya Okugawa
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Masashi Fukushima
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Toshihiko Tomita
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Tadayuki Oshima
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Hirokazu Fukui
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Koichi Noguchi
- Department of Anatomy and Neuroscience, Hyogo College of Medicine, Nishinomiya, Japan
| | - Yi Dai
- Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan.,Department of Anatomy and Neuroscience, Hyogo College of Medicine, Nishinomiya, Japan
| | - Hiroto Miwa
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
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6
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Cordner ZA, Li Q, Liu L, Tamashiro KL, Bhargava A, Moran TH, Pasricha PJ. Vagal gut-brain signaling mediates amygdaloid plasticity, affect, and pain in a functional dyspepsia model. JCI Insight 2021; 6:144046. [PMID: 33591956 PMCID: PMC8026195 DOI: 10.1172/jci.insight.144046] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 02/10/2021] [Indexed: 12/11/2022] Open
Abstract
Functional dyspepsia (FD) is associated with chronic gastrointestinal distress and with anxiety and depression. Here, we hypothesized that aberrant gastric signals, transmitted by the vagus nerve, may alter key brain regions modulating affective and pain behavior. Using a previously validated rat model of FD characterized by gastric hypersensitivity, depression-like behavior, and anxiety-like behavior, we found that vagal activity - in response to gastric distention - was increased in FD rats. The FD phenotype was associated with gastric mast cell hyperplasia and increased expression of corticotrophin-releasing factor (Crh) and decreased brain-derived neurotrophic factor genes in the central amygdala. Subdiaphragmatic vagotomy reversed these changes and restored affective behavior to that of controls. Vagotomy partially attenuated pain responses to gastric distention, which may be mediated by central reflexes in the periaqueductal gray, as determined by local injection of lidocaine. Ketotifen, a mast cell stabilizer, reduced vagal hypersensitivity, normalized affective behavior, and attenuated gastric hyperalgesia. In conclusion, vagal activity, partially driven by gastric mast cells, induces long-lasting changes in Crh signaling in the amygdala that may be responsible for enhanced pain and enhanced anxiety- and depression-like behaviors. Together, these results support a "bottom-up" pathway involving the gut-brain axis in the pathogenesis of both gastric pain and psychiatric comorbidity in FD.
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Affiliation(s)
| | - Qian Li
- Center for Neurogastroenterology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Liansheng Liu
- Center for Neurogastroenterology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | - Aditi Bhargava
- Department of Obstetrics and Gynecology and The Center for Reproductive Sciences, UCSF, San Francisco, California, USA
| | | | - Pankaj Jay Pasricha
- Center for Neurogastroenterology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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7
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Abboud C, Duveau A, Bouali-Benazzouz R, Massé K, Mattar J, Brochoire L, Fossat P, Boué-Grabot E, Hleihel W, Landry M. Animal models of pain: Diversity and benefits. J Neurosci Methods 2020; 348:108997. [PMID: 33188801 DOI: 10.1016/j.jneumeth.2020.108997] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 11/03/2020] [Accepted: 11/08/2020] [Indexed: 12/15/2022]
Abstract
Chronic pain is a maladaptive neurological disease that remains a major health problem. A deepening of our knowledge on mechanisms that cause pain is a prerequisite to developing novel treatments. A large variety of animal models of pain has been developed that recapitulate the diverse symptoms of different pain pathologies. These models reproduce different pain phenotypes and remain necessary to examine the multidimensional aspects of pain and understand the cellular and molecular basis underlying pain conditions. In this review, we propose an overview of animal models, from simple organisms to rodents and non-human primates and the specific traits of pain pathologies they model. We present the main behavioral tests for assessing pain and investing the underpinning mechanisms of chronic pathological pain. The validity of animal models is analysed based on their ability to mimic human clinical diseases and to predict treatment outcomes. Refine characterization of pathological phenotypes also requires to consider pain globally using specific procedures dedicated to study emotional comorbidities of pain. We discuss the limitations of pain models when research findings fail to be translated from animal models to human clinics. But we also point to some recent successes in analgesic drug development that highlight strategies for improving the predictive validity of animal models of pain. Finally, we emphasize the importance of using assortments of preclinical pain models to identify pain subtype mechanisms, and to foster the development of better analgesics.
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Affiliation(s)
- Cynthia Abboud
- Univ. Bordeaux, CNRS, Interdisciplinary Institute for Neuroscience, IINS, UMR 5297, F-33000 Bordeaux, France; Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France; Faculty of Arts and Sciences, Holy Spirit University of Kaslik (USEK), Lebanon
| | - Alexia Duveau
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France
| | - Rabia Bouali-Benazzouz
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France
| | - Karine Massé
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France
| | - Joseph Mattar
- School of Medicine and Medical Sciences, Holy Spirit University of Kaslik (USEK), Lebanon
| | - Louison Brochoire
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France
| | - Pascal Fossat
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France
| | - Eric Boué-Grabot
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France
| | - Walid Hleihel
- School of Medicine and Medical Sciences, Holy Spirit University of Kaslik (USEK), Lebanon; Faculty of Arts and Sciences, Holy Spirit University of Kaslik (USEK), Lebanon
| | - Marc Landry
- Univ. Bordeaux, CNRS, Institute for Neurodegenerative Diseases, IMN, UMR 5293, F-33000 Bordeaux, France.
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Upregulation of the TRPA1 Ion Channel in the Gastric Mucosa after Iodoacetamide-Induced Gastritis in Rats: A Potential New Therapeutic Target. Int J Mol Sci 2020; 21:ijms21165591. [PMID: 32764237 PMCID: PMC7460663 DOI: 10.3390/ijms21165591] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 07/20/2020] [Accepted: 07/28/2020] [Indexed: 02/08/2023] Open
Abstract
Acute gastritis is often untreatable by acid secretion-inhibiting drugs. Understanding the protective mechanisms including the role of Transient Receptor Potential Ankyrin1 (TRPA1) and Vanilloid1 (TRPV1) channels localized on capsaicin-sensitive afferents and non-neuronal structures might identify novel therapeutic approaches. Therefore, we characterized a translational gastritis model using iodoacetamide (IAA) and investigated TRPA1/V1 expressions. Wistar rats and CD1, C57Bl/6J mice were exposed to IAA-containing (0.05, 0.1, 0.2, 0.3, 0.5%) drinking water for 7 or 14 days. Body weight and water consumption were recorded daily. Macroscopic lesions were scored, qualitative histopathologic investigation was performed, TRPA1/V1 immunopositivity and mRNA expressions were measured. IAA induced a concentration-dependent weight loss and reduced water intake in both species. Hyperemia, submucosal edema, inflammatory infiltration and hemorrhagic erosions developed after 7 days, while ulcers after 14 days in rats. Trpa1 mRNA/protein expressions were upregulated at both timepoints. Meanwhile, TRPV1 immunopositivity was upregulated in the gastric corpus after 0.05% IAA ingestion, but downregulated after 0.2%, whereas Trpv1 mRNA did not change. Interestingly, no macroscopic/microscopic changes were observed in mice. These are the first data for the concentration- and duration-dependent changes in the IAA-induced gastritis in rats accompanied by TRPA1 upregulation, therefore, its therapeutic potential in gastritis should further be investigated.
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Meleine M, Mounien L, Atmani K, Ouelaa W, Bôle-Feysot C, Guérin C, Depoortere I, Gourcerol G. Ghrelin inhibits autonomic response to gastric distension in rats by acting on vagal pathway. Sci Rep 2020; 10:9986. [PMID: 32561800 PMCID: PMC7305309 DOI: 10.1038/s41598-020-67053-y] [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: 07/31/2019] [Accepted: 05/15/2020] [Indexed: 12/25/2022] Open
Abstract
Ghrelin is the only orexigenic peptide currently known and a potent prokinetic by promoting gastric motility but novel insights suggest that its role extends beyond satiety regulation. Whereas ghrelin was shown to provide somatic and colonic antinociception, its impact on gastric sensitivity is unknown even though stomach is a major ghrelin secreting tissue. Autonomic response to gastric mechanosensitivity was estimated by measuring blood pressure variation as a surrogate marker in response to gastric distension (GD) before and after ghrelin (or vehicle) administration. Involvement of spinal and vagal pathways in the ghrelin effect was studied by performing celiac ganglionectomy and subdiaphragmatic vagotomy respectively and by evaluating the expression of phosphorylated extracellular-regulated kinase 1/2 (p-ERK1/2) in dorsal root and nodose ganglia. Finally the phenotype of Ghrelin receptor expressing neurons within the nodose ganglia was determined by in situ hybridization and immunofluorescence. Ghrelin reduced blood pressure variation in response to GD except in vagotomized rats. Phosphorylated-ERK1/2 levels indicated that ghrelin reduced neuronal activation induced by GD in nodose ganglion. The effect of ghrelin on gastric mechanosensitivity was abolished by pre-treatment with antagonist [D-Lys3]-GHRP-6 (0.3 mg/kg i.v.). Immunofluorescence staining highlights the colocalization of Ghrelin receptor with ASIC3 and TRPV1 within gastric neurons of nodose ganglion. Ghrelin administration reduced autonomic response to gastric distension. This effect likely involved the Ghrelin receptor and vagal pathways.
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Affiliation(s)
- Mathieu Meleine
- Nutrition, Gut & Brain Unit (INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France. .,Université Clermont Auvergne, Inserm U1107, NeuroDol, Clermont-Ferrand, France.
| | - Lourdes Mounien
- Center for Cardiovascular and Nutrition Research, (UMR 1260 INRA/1263 INSERM), Aix-Marseille University, Marseille, France
| | - Karim Atmani
- Nutrition, Gut & Brain Unit (INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France
| | - Wassila Ouelaa
- Nutrition, Gut & Brain Unit (INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France
| | - Christine Bôle-Feysot
- Nutrition, Gut & Brain Unit (INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France
| | - Charlène Guérin
- Nutrition, Gut & Brain Unit (INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France
| | - Inge Depoortere
- Gut Peptide Research Lab, Translational Research Center for GastroIntestinal Disorders, KU Leuven, Leuven, Belgium
| | - Guillaume Gourcerol
- Nutrition, Gut & Brain Unit (INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France.,Department of Physiology, Rouen University Hospital, Rouen, France
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10
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Oliva-Pascual-Vaca Á, González-González C, Oliva-Pascual-Vaca J, Piña-Pozo F, Ferragut-Garcías A, Fernández-Domínguez JC, Heredia-Rizo AM. Visceral Origin: An Underestimated Source of Neck Pain. A Systematic Scoping Review. Diagnostics (Basel) 2019; 9:diagnostics9040186. [PMID: 31726685 PMCID: PMC6963844 DOI: 10.3390/diagnostics9040186] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/01/2019] [Accepted: 11/06/2019] [Indexed: 12/12/2022] Open
Abstract
The diagnosis of neck pain is challenging. Many visceral disorders are known to cause it, and clinical practice guidelines recommend to rule them out during neck pain diagnosis. However, the absence of suspicion of any cause impedes one from establishing that specific aetiology as the final diagnosis. To investigate the degree of consideration given to visceral aetiology, a systematic search of trials about neck pain was carried out to evaluate their selection criteria. The search yielded 309 eligible articles, which were screened by two independent reviewers. The PEDro scale score was used to assess the methodological quality of the studies. The following information was retrieved: number of authors affiliated to a clinical or non-clinical institution, number of citations in the Web of Science, study aims, characteristics of participants, and eligibility criteria. The top 15 most cited trials, and the 15 most recent studies about treatment efficacy in neck pain, published in first quartile journals of the Journal Citation Reports, were selected. Females represented 67.5% of participants. A single study was of poor methodological quality (4/10). Based on the eligibility criteria of the articles that were systematically reviewed, it would appear that visceral aetiology was not considered in eighty percent of the trials on neck pain, showing a low level of suspicion both in research and clinical settings.
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Affiliation(s)
- Ángel Oliva-Pascual-Vaca
- Department of Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, University of Sevilla, 41009 Sevilla, Spain; (Á.O.-P.-V.); (C.G.-G.); (A.M.H.-R.)
| | - Carlos González-González
- Department of Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, University of Sevilla, 41009 Sevilla, Spain; (Á.O.-P.-V.); (C.G.-G.); (A.M.H.-R.)
| | - Jesús Oliva-Pascual-Vaca
- Department of Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, University of Sevilla, 41009 Sevilla, Spain; (Á.O.-P.-V.); (C.G.-G.); (A.M.H.-R.)
- Escuela de Osteopatía de Madrid, 28002 Madrid, Spain
- Department of Physiotherapy, Universitary School of Osuna, University of Sevilla, 41640 Sevilla, Spain;
- Correspondence:
| | - Fernando Piña-Pozo
- Department of Physiotherapy, Universitary School of Osuna, University of Sevilla, 41640 Sevilla, Spain;
| | - Alejandro Ferragut-Garcías
- Department of Nursing and Physiotherapy, University of the Balearic Islands, 07112 Palma de Mallorca, Spain; (A.F.-G.); (J.C.F.-D.)
| | - Juan Carlos Fernández-Domínguez
- Department of Nursing and Physiotherapy, University of the Balearic Islands, 07112 Palma de Mallorca, Spain; (A.F.-G.); (J.C.F.-D.)
| | - Alberto Marcos Heredia-Rizo
- Department of Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, University of Sevilla, 41009 Sevilla, Spain; (Á.O.-P.-V.); (C.G.-G.); (A.M.H.-R.)
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11
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Effects of Osteopathic Visceral Treatment in Patients with Gastroesophageal Reflux: A Randomized Controlled Trial. J Clin Med 2019; 8:jcm8101738. [PMID: 31635110 PMCID: PMC6832476 DOI: 10.3390/jcm8101738] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 10/16/2019] [Accepted: 10/17/2019] [Indexed: 02/07/2023] Open
Abstract
Osteopathic manual treatment has been recommended as a non-pharmacological therapy for Gastroesophageal Reflux Disease (GERD). However, to date, no study has supported the effectiveness of this intervention with respect to the symptoms of the disease. Our goal was to assess the effect of an osteopathic manual technique for the lower esophageal sphincter on GERD symptoms, cervical mobility and on the C4 spinous process pressure pain threshold (PPTs). METHODS A randomized, double-blind placebo-controlled trial was performed. Sixty subjects suffering from GERD participated in this study and were randomly assigned to either an experimental group (EG) (n = 29), who received the osteopathic technique for the lower esophageal sphincter, or to a control group (CG) (n = 31), who received a manual contact, which mimicked the osteopathic technique without exerting any therapeutic force. Randomization was computer-generated, with allocation concealed by sequentially numbered, opaque, sealed envelopes. The GerdQ questionnaire was used to assess symptom changes the week after intervention. Cervical Range of Motion (CROM) and algometer were used to evaluate cervical mobility and PPTs before and after both treatments. Before-after between groups comparison (t-test) was used for statistical analysis of the outcome, with two measurement points (GerdQ), while repeated-measures ANOVA was used for those outcomes with four measurement points (CROM and PPT). RESULTS The application of the osteopathic manual treatment in subjects with GERD produced a significant improvement in symptoms one week after the intervention (p = 0.005) with a between-groups difference of 1.49 points in GerdQ score (95% CI: 0.47-2.49). PPT C4 improved in the EG after the treatment (p = 0.034; η2 = 0.048) (between-groups difference 8.78 Newton/cm2; 95% CI: 0.48-17.09). CROM also increased in the EG compared to the CG (p < 0.001; η2 = 0.108) (between-groups difference 33.89 degrees; 95% CI: 15.17-52.61). CONCLUSIONS The manual osteopathic technique produces an improvement in GERD symptoms one week after treatment, cervical mobility, and PPTs. This may mean that osteopathic treatment is useful for improving symptoms of GERD.
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Kozakai Y, Hori K, Aye-Mon A, Okuda H, Harada SI, Hayashi K, Ozaki N. The role of peripheral corticotropin-releasing factor signaling in a rat model of stress-induced gastric hyperalgesia. Biochem Biophys Res Commun 2019; 519:797-802. [PMID: 31558322 DOI: 10.1016/j.bbrc.2019.09.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 09/11/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND Functional dyspepsia (FD) is a common gastrointestinal disorder associated with persistent or recurrent upper gastrointestinal tract symptoms such as pain without any obvious pathological changes. Psychological and psychiatric factors might have a pathogenic role in FD. Changes in the sensation of stomach pain were determined after application of stress to adult rats. The involvement of corticotropin-releasing factor (CRF), Type 2 CRF receptor (CRF2) and inflammatory cytokine interleukin-6 (IL-6) was also investigated in the gastric hyperalgesia observed in this model. RESULTS Repeated water avoidance stress (WA-S) produced gastric hyperalgesia, with no obvious lesions in the gastric mucosa. Gastric hyperalgesia was inhibited by CRF and CRF2 antagonists, suggesting their involvement in gastric hyperalgesia observed after application of stress. Gastric hyperalgesia was inhibited by IL-6 neutralizing antibody. Immunofluorescence staining demonstrated CRF, CRF2, urocortin (Ucn)1, and Ucn2-positive cells in the gastric mucosa. CRF2-positive cells increased after WA-S, compared to sham stress. CRF2 and Ucn2 were expressed in the mast cells in the gastric mucosa. CONCLUSIONS CRF2 plays an important role in gastric hyperalgesia produced by stress. CRF2 signaling may be a useful therapeutic target for functional dyspepsia.
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Affiliation(s)
- Yu Kozakai
- Department of Functional Anatomy, Graduate School of Medical Sciences, Kanazawa University, Japan
| | - Kiyomi Hori
- Department of Functional Anatomy, Graduate School of Medical Sciences, Kanazawa University, Japan
| | - Aye Aye-Mon
- Department of Anatomy, University of Medicine (1), Yangon, Myanmar
| | - Hiroaki Okuda
- Department of Functional Anatomy, Graduate School of Medical Sciences, Kanazawa University, Japan
| | - Shin-Ichi Harada
- Department of Biochemistry and Center for Biomedical Research and Education, Graduate School of Medical Sciences, Kanazawa University, Japan
| | - Koei Hayashi
- Department of Functional Anatomy, Graduate School of Medical Sciences, Kanazawa University, Japan
| | - Noriyuki Ozaki
- Department of Functional Anatomy, Graduate School of Medical Sciences, Kanazawa University, Japan.
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13
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Dong Y, Li S, Yin J, Chen JDZ. Ameliorating effects of optimized gastric electrical stimulation and mechanisms involving nerve growth factor and opioids in a rodent model of gastric hypersensitivity. Neurogastroenterol Motil 2019; 31:e13551. [PMID: 30790401 DOI: 10.1111/nmo.13551] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 12/09/2018] [Accepted: 12/20/2018] [Indexed: 02/08/2023]
Abstract
BACKGROUND Gastric electrical stimulation (GES) has been applied to treat gastric motility disorders for decades. This study was designed to investigate the effects and mechanisms of GES for visceral hypersensitivity in a rodent model of functional dyspepsia (FD). METHODS Male Sprague-Dawley rat pups at 10-days old received 0.1% iodoacetamide (IA) daily for 6 days. The experiments were performed when the rats reached 8-11 weeks of age, and visceral hypersensitivity was established. Then, GES parameters were optimized and the chronic effects of GES on gastric hypersensitivity were assessed by electromyogram (EMG). Naloxone (3 mg/kg), D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2 (CTOP, 1 mg/kg), and anti-NGF (16 μg/kg) were individually intraperitoneally injected to investigate opioid and nerve growth factor (NGF) mechanisms. Tissues were analyzed for NGF expression. KEY RESULTS In the IA-treated rats, the visceromotor response to gastric distension was significantly increased, and both acute GES with optimized stimulation parameters (0.25 seconds on, 0.25 seconds off, 100 Hz, 0.25 ms, 6 mA) and chronic GES (7 days, 2 hours/day) normalized gastric hypersensitivity. The inhibitory effect of GES on gastric hypersensitivity was blocked by naloxone and CTOP. Anti-NGF normalized EMG responses in IA-treated rats. The expressions of NGF in the tissues of IA-treated rats were dramatically increased, and these increases were suppressed with GES. CONCLUSIONS AND INFERENCES GES with optimized parameters improves gastric hypersensitivity induced by neonatal treatment of IA mediated peripherally by suppressing NGF and via the opioid mechanism involving the µ receptor. GES as a potential therapy for treating visceral pain may be explored in clinical studies.
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Affiliation(s)
- Yan Dong
- Veterans Research and Education Foundation, VA Medical Center, Oklahoma City, Oklahoma.,Institute of Chinese Traditional Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Shiying Li
- Veterans Research and Education Foundation, VA Medical Center, Oklahoma City, Oklahoma.,Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Jieyun Yin
- Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Jiande D Z Chen
- Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
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Aye-Mon A, Hori K, Kozakai Y, Nakagawa T, Hiraga S, Nakamura T, Shiraishi Y, Okuda H, Ozaki N. CCR2 upregulation in DRG neurons plays a crucial role in gastric hyperalgesia associated with diabetic gastropathy. Mol Pain 2018; 14:1744806917751322. [PMID: 29359616 PMCID: PMC5784547 DOI: 10.1177/1744806917751322] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Background Diabetic gastropathy is a complex neuromuscular dysfunction of the stomach that commonly occurs in diabetes mellitus. Diabetic patients often present with upper gastrointestinal symptoms, such as epigastric discomfort or pain. The aim of this study was to assess gastric sensation in streptozocin-induced diabetes mellitus (DM) rats and to determine the contribution of C-C motif chemokine receptor 2 (CCR2) signaling to gastric hyperalgesia. Results DM rats showed signs of neuropathy (cutaneous mechanical hyperalgesia) from two weeks after streptozocin administration until the end of the experiment. Accelerated solid gastric emptying was observed at two weeks after streptozocin administration compared to the controls. Intense gastric hyperalgesia also developed in DM rats at two weeks after streptozocin administration, which was significantly reduced after intrathecal administration of the CCR2 antagonist INCB3344. Immunochemical analysis indicated that CCR2 expression was substantially upregulated in small and medium-sized dorsal root ganglia neurons of DM rats, although the protein level of monocyte chemoattractant protein-1, the preferred ligand for CCR2, was not significantly different between the control and DM groups. Conclusions These data suggest that CCR2 activation in nociceptive dorsal root ganglia neurons plays a role in the pathogenesis of gastric hyperalgesia associated with diabetic gastropathy and that CCR2 antagonist may be a promising treatment for therapeutic intervention.
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Affiliation(s)
- Aye Aye-Mon
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Kiyomi Hori
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Yu Kozakai
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Tatsuki Nakagawa
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Shinichiro Hiraga
- 2 Department of Molecular neuroscience, Graduate school of Medicine, Osaka University, Osaka, Japan
| | - Tsuneo Nakamura
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Yoshitake Shiraishi
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Hiroaki Okuda
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
| | - Noriyuki Ozaki
- 1 Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan
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Liang Q, Yan Y, Mao L, Du X, Liang J, Liu J, Wang L, Li H. Evaluation of a modified rat model for functional dyspepsia. Saudi J Gastroenterol 2018; 24:228-235. [PMID: 29652029 PMCID: PMC6080150 DOI: 10.4103/sjg.sjg_505_17] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND/AIM The purpose of this study was to establish a modified rat model with functional dyspepsia (FD) and analyze the changes in gastrointestinal motility and brain-gut peptide levels in serum and brain-gut axis. MATERIALS AND METHODS Male Wistar rats were divided into control group (Con) and FD model group. FD model was established by stimulating semi-starvation rats via tail damping, provocation, and forced exercise fatigue until gastrointestinal motility disorder appeared, and then levels of motilin, leptin, cholecystokinin (CCK), and vasoactive intestinal peptide (VIP) were detected in serum by enzyme linked immunosorbent assay and in duodenum, antrum, and hypothalamus by immunohistochemistry, reverse transcriptase-polymerase chain reaction, and Western blot. RESULTS The results showed rates of intestinal propulsion and gastric emptying slowed down markedly compared to Con (P < 0.05), the gastrointestinal electric activity attenuated, and migrating motor complex (MMC) interrupted in the model group. The levels of leptin and VIP markedly increased, but motilin decreased as compared to the Con (P < 0.05) in serum and in the above tissues. It is interesting that the level of CCK decreased in the antrum and duodenum but increased in the hypothalamus as compared to Con (P < 0.05). CONCLUSIONS The modified rat model meets the diagnostic criteria of FD and can be used as a method for studying FD in animals.
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Affiliation(s)
- Qiankun Liang
- Department of Physiology, College of Basic Medicine, Lanzhou University, Lanzhou, China
| | - Yuan Yan
- Department of Physiology, College of Basic Medicine, Lanzhou University, Lanzhou, China
| | - Lanfang Mao
- Department of Gastroenterology, Affiliated Hospital of Gansu University of Chinese Medicine, Lanzhou, China
| | - Xiaojuan Du
- Department of Gastroenterology, Affiliated Hospital of Gansu University of Chinese Medicine, Lanzhou, China
| | - Jingjing Liang
- Department of Physiology, College of Basic Medicine, Lanzhou University, Lanzhou, China
| | - Junhong Liu
- Department of Gastroenterology, Affiliated Hospital of Gansu University of Chinese Medicine, Lanzhou, China
| | - Longde Wang
- Department of Gastroenterology, Affiliated Hospital of Gansu University of Chinese Medicine, Lanzhou, China
| | - Hongfang Li
- Department of Physiology, College of Basic Medicine, Lanzhou University, Lanzhou, China,Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou, China,Address for correspondence: Prof. Hongfang Li, Department of Physiology, College of Basic Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou - 730 000, People's Republic of China. E-mail:
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16
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Jing FC, Zhang J, Feng C, Nian YY, Wang JH, Hu H, Yang BD, Sun XM, Zheng JY, Yin XR. Potential rat model of anxiety-like gastric hypersensitivity induced by sequential stress. World J Gastroenterol 2017; 23:7594-7608. [PMID: 29204059 PMCID: PMC5698252 DOI: 10.3748/wjg.v23.i42.7594] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 10/04/2017] [Accepted: 10/18/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To establish a rat model of anxiety-like gastric hypersensitivity (GHS) of functional dyspepsia (FD) induced by novel sequential stress.
METHODS Animal pups were divided into two groups from postnatal day 2: controls and the sequential-stress-treated. The sequential-stress-treated group received maternal separation and acute gastric irritation early in life and restraint stress in adulthood; controls were reared undisturbed with their mothers. Rats in both groups were followed to adulthood (8 wk) at which point the anxiety-like behaviors and visceromotor responses to gastric distention (20-100 mmHg) and gastric emptying were tested. Meanwhile, alterations in several anxiety-related brain-stomach modulators including 5-hydroxytryptamine (5-HT), γ-aminobutyric acid (GABA), brain-derived neurotrophic factor (BDNF) and nesfatin-1 in the rat hippocampus, plasma and gastric fundus and the 5-HT1A receptor (5-HT1AR) in the hippocampal CA1 subfield and the mucosa of the gastric fundus were examined.
RESULTS Sequential-stress-treated rats simultaneously demonstrated anxiety-like behaviors and GHS in dose-dependent manner compared with the control group. Although rats in both groups consumed similar amount of solid food, the rate of gastric emptying was lower in the sequential-stress-treated rats than in the control group. Sequential stress significantly decreased the levels of 5-HT (51.91 ± 1.88 vs 104.21 ± 2.88, P < 0.01), GABA (2.38 ± 0.16 vs 5.01 ± 0.13, P < 0.01) and BDNF (304.40 ± 10.16 vs 698.17 ± 27.91, P < 0.01) in the hippocampus but increased the content of nesfatin-1 (1961.38 ± 56.89 vs 1007.50 ± 33.05, P < 0.01) in the same site; significantly decreased the levels of 5-HT (47.82 ± 2.29 vs 89.45 ± 2.61, P < 0.01) and BDNF (257.05 ± 12.89 vs 536.71 ± 20.73, P < 0.01) in the plasma but increased the content of nesfatin-1 in it (1391.75 ± 42.77 vs 737.88 ± 33.15, P < 0.01); significantly decreased the levels of 5-HT (41.15 ± 1.81 vs 89.17 ± 2.31, P < 0.01) and BDNF (226.49 ± 12.10 vs 551.36 ± 16.47, P < 0.01) in the gastric fundus but increased the content of nesfatin-1 in the same site (1534.75 ± 38.52 vs 819.63 ± 38.04, P < 0.01). The expressions of 5-HT1AR in the hippocampal CA1 subfield and the mucosa of the gastric fundus were down-regulated measured by IHC (Optical Density value: Hippocampus 15253.50 ± 760.35 vs 21149.75 ± 834.13; gastric fundus 15865.25 ± 521.24 vs 23865.75 ± 1868.60; P < 0.05, respectively) and WB (0.38 ± 0.01 vs 0.57 ± 0.03, P < 0.01) (n = 8 in each group).
CONCLUSION Sequential stress could induce a potential rat model of anxiety-like GHS of FD, which could be used to research the mechanisms of this intractable disease.
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Affiliation(s)
- Fu-Chun Jing
- Department of Gastroenterology, Second Hospital Affiliated to the Medical School of Xi’an Jiao Tong University, Xi’an 710004, Shaanxi Province, China
- Department of Digestive Diseases, Baoji People’s Hospital Affiliated to the Medical School of Yan’an University, Baoji 721000, Shaanxi Province, China
| | - Jun Zhang
- Department of Gastroenterology, Second Hospital Affiliated to the Medical School of Xi’an Jiao Tong University, Xi’an 710004, Shaanxi Province, China
| | - Chen Feng
- Department of Gastroenterology, Second Hospital Affiliated to the Medical School of Xi’an Jiao Tong University, Xi’an 710004, Shaanxi Province, China
| | - Yuan-Yuan Nian
- Department of Gastroenterology, Second Hospital Affiliated to the Medical School of Xi’an Jiao Tong University, Xi’an 710004, Shaanxi Province, China
| | - Jin-Hai Wang
- Department of Gastroenterology, Second Hospital Affiliated to the Medical School of Xi’an Jiao Tong University, Xi’an 710004, Shaanxi Province, China
| | - Hao Hu
- Department of Pharmacology, Health Science Center, Xi’an Jiao Tong University, Xi’an 710061, Shaanxi Province, China
- Basic Medical Experiment Teaching Center, Health Science Center, Xi’an Jiao Tong University, Xi’an 710061, Shaanxi Province, China
| | - Bao-De Yang
- Department of Pharmacology, Health Science Center, Xi’an Jiao Tong University, Xi’an 710061, Shaanxi Province, China
- Basic Medical Experiment Teaching Center, Health Science Center, Xi’an Jiao Tong University, Xi’an 710061, Shaanxi Province, China
| | - Xiao-Ming Sun
- Department of Pharmacology, Health Science Center, Xi’an Jiao Tong University, Xi’an 710061, Shaanxi Province, China
- Basic Medical Experiment Teaching Center, Health Science Center, Xi’an Jiao Tong University, Xi’an 710061, Shaanxi Province, China
| | - Jian-Yun Zheng
- Department of Pathology, the First Affiliated Hospital of Xi’an Medical University, Xi’an 710077, Shaanxi Province, China
| | - Xiao-Ran Yin
- Department of Gastroenterology, Second Hospital Affiliated to the Medical School of Xi’an Jiao Tong University, Xi’an 710004, Shaanxi Province, China
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Hummel M, Knappenberger T, Reilly M, Whiteside GT. Pharmacological evaluation of NSAID-induced gastropathy as a "Translatable" model of referred visceral hypersensitivity. World J Gastroenterol 2017; 23:6065-6076. [PMID: 28970722 PMCID: PMC5597498 DOI: 10.3748/wjg.v23.i33.6065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/31/2017] [Accepted: 07/12/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To evaluate whether non-steroidal anti-inflammatory drugs (NSAIDs)-induced gastropathy is a clinically predictive model of referred visceral hypersensitivity.
METHODS Gastric ulcer pain was induced by the oral administration of indomethacin to male, CD1 mice (n = 10/group) and then assessed by measuring referred abdominal hypersensitivity to tactile application. A diverse range of pharmacological mechanisms contributing to the pain were subsequently investigated. These mechanisms included: transient receptor potential (TRP), sodium and acid-sensing ion channels (ASICs) as well as opioid receptors and guanylate cyclase C (GC-C).
RESULTS Results showed that two opioids and a GC-C agonist, morphine, asimadoline and linaclotide, respectively, the TRP antagonists, AMG9810 and HC-030031 and the sodium channel blocker, carbamazepine, elicited a dose- and/or time-dependent attenuation of referred visceral hypersensitivity, while the ASIC blocker, amiloride, was ineffective at all doses tested.
CONCLUSION Together, these findings implicate opioid receptors, GC-C, and sodium and TRP channel activation as possible mechanisms associated with visceral hypersensitivity. More importantly, these findings also validate NSAID-induced gastropathy as a sensitive and clinically predictive mouse model suitable for assessing novel molecules with potential pain-attenuating properties.
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Affiliation(s)
- Michele Hummel
- Purdue Pharma L.P., Discovery Research, Cranbury, NJ 08512, United States
| | | | - Meghan Reilly
- Purdue Pharma L.P., Discovery Research, Cranbury, NJ 08512, United States
| | - Garth T Whiteside
- Purdue Pharma L.P., Discovery Research, Cranbury, NJ 08512, United States
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18
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Uchida M, Iwamoto C. Influence of amino acids on gastric adaptive relaxation (accommodation) in rats as evaluated with a barostat. J Smooth Muscle Res 2017; 52:56-65. [PMID: 27558952 PMCID: PMC5321853 DOI: 10.1540/jsmr.52.56] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Aim: The present study aimed to evaluate the effects of selected straight alkyl chain,
hydroxylated chain and branched chain amino acids on gastric adaptive relaxation, as these
have previously been shown to have differing effects on gastric emptying. Materials and
Methods: Gastric adaptive relaxation was evaluated using a barostat in rats under urethane
anesthesia. The pressure within the balloon, introduced from the mouth to the stomach, was
changed stepwise from 1 to 8 mmHg. The increased volume just after the increase of balloon
pressure was defined as distension-induced gastric adaptive relaxation (accommodation).
Amino acids were administered orally or intravenously. Results: As compared with control
rats administered with distilled water, those rats that were orally administered amino
acids having straight alkyl chain and extra hydroxylated alkyl chain, such as glycine and
l-serine, had significantly enhanced gastric adaptive relaxation, but administration of
l-alanine and l-threonine did not. Branched chain amino acids, such as l-isoleucine,
l-leucine and l-valine, also did not significantly influence gastric adaptive relaxation.
Glycine and l-serine showed the same efficacy when administered intravenously. Conclusion:
Among the amino acids evaluated in the present study, glycine and l-serine significantly
enhanced gastric adaptive relaxation, suggesting that short alkyl chain amino acids may
enhance gastric adaptive relaxation as compared with the other amino acids. These findings
may suggest that glycine and l-serine would be useful in the therapy of functional
dyspepsia, especially for early satiety, because the dysfunction of adaptive relaxation is
one of the causes of early satiety.
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Affiliation(s)
- Masayuki Uchida
- Food Science Research Laboratories, Research and Development Division, Meiji Co., Ltd., Kanagawa, Japan
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Abstract
INTRODUCTION The etiologies of functional dyspepsia symptoms, including postprandial distress syndrome, remain unknown. We tested the hypothesis that neonatal colon inflammation induces postprandial distress syndrome-like symptoms in adult life that associate with increased activation of vagal afferent pathways and forebrain limbic regions. RESULTS These rats showed a significant decrease in nutrient meal consumption to satiety after an overnight fast, decrease in gastric emptying, decrease in total distance traveled, and decrease in percent distance traveled in midfield versus control rats in open field test, indicating postprandial anxiety- and depression-like behaviors. Adult naïve rats treated with oral iodoacetamide to induce H. pylori-like mild gastritis demonstrated similar postprandial effects as the above rats. CONCLUSIONS We concluded that neonatal colon inflammation is a risk factor for the development of postprandial distress syndrome-like symptoms. While mild gastritis can induce symptoms similar to those of neonatal colon inflammation, gastritis in these rats does not worsen the symptoms.
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21
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Uchida M, Iwamoto C. Effect of colonic distension on gastric adaptive relaxation in rats: barostatic evaluation using an orally introduced gastric balloon. J Smooth Muscle Res 2016; 50:78-84. [PMID: 26081370 PMCID: PMC5137303 DOI: 10.1540/jsmr.50.78] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
While the gastrocolonic reflex has been known, the cologastric relationship has not been
clarified especially with regard to gastric adaptive relaxation. Therefore, in this study
we have examined the correlation between gastric adaptive relaxation and colonic
distension. Male Sprague-Dawley rats were used after fasting for 18 h. Colonic distension
was performed by injecting 2.2 ml of air into a colonic balloon inserted into the colon
for 5 min in conscious state. After urethane anesthesia, gastric adaptive relaxation was
investigated by using a slightly modified gastric balloon introduced into the stomach
through the mouth. Gastric balloon volumes increased gradually just after an increment in
the gastric balloon pressure (1 to 8 mmHg), and reached a plateau within 1 min. This
increased volume was defined as gastric adaptive relaxation. In control rats, gastric
adaptive relaxation increased with pressure increments in a pressure dependent manner. In
the colon-distended rats, gastric adaptive relaxation increased also in a pressure
dependent manner, but was significantly inhibited as compared with control at 8 mmHg
(P<0.05). These findings show that colonic distension inhibits the
gastric adaptive relaxation and suggests the existence of a cologastric relationship in
rats.
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Affiliation(s)
- Masayuki Uchida
- Food Science Research Laboratories, Division of Research and Development, Meiji Co. Ltd., Japan
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Strong Manual Acupuncture Manipulation Could Better Inhibit Spike Frequency of the Dorsal Horn Neurons in Rats with Acute Visceral Nociception. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 2015:675437. [PMID: 26257816 PMCID: PMC4518182 DOI: 10.1155/2015/675437] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 04/21/2015] [Accepted: 04/21/2015] [Indexed: 12/12/2022]
Abstract
Afferent impulses from visceral nociception can be regulated by acupuncture at spinal cord level; however, the effects of different manual acupuncture (MA) manipulations on the afferent impulses are still unknown. Here, we analyzed the spike frequency of excitatory gastric-related wide dynamic range (WDR) neurons in spinal dorsal horn (SDH) following acute gastric distension (GD) in rats and compared their responses to MA manipulations with four different frequencies (0.5, 1, 2, and 3 Hz) at Zusanli (ST36). Results indicated that the spike frequency was increased by acute GD stimulation. Under acute GD circumstances, the spike frequency was further activated by weak MA stimulation (0.5 and 1 Hz), while being significantly inhibited by strong MA stimulation (2 and 3 Hz). After 10 minutes of the strong MA stimulation, same intensity of acute GD caused less spike frequency. Our previous researches had demonstrated that different MA manipulations could increase spike frequency in an intensity-dependent manner in normal rats; these findings suggest that acupuncture may have different modulatory effects depending on the state of the stomach. Since neuronal spike frequency was related to the level of nociception, the results suggest that strong MA manipulation may have better effect on acute visceral nociception.
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Abstract
The gastrointestinal tract is innervated by several distinct populations of neurons, whose cell bodies either reside within (intrinsic) or outside (extrinsic) the gastrointestinal wall. Normally, most individuals are unaware of the continuous, complicated functions of these neurons. However, for patients with gastrointestinal disorders, such as IBD and IBS, altered gastrointestinal motility, discomfort and pain are common, debilitating symptoms. Although bouts of intestinal inflammation underlie the symptoms associated with IBD, increasing preclinical and clinical evidence indicates that infection and inflammation are also key risk factors for the development of other gastrointestinal disorders. Notably, a strong correlation exists between prior exposure to gut infection and symptom occurrence in IBS. This Review discusses the evidence for neuroplasticity (structural, synaptic or intrinsic changes that alter neuronal function) affecting gastrointestinal function. Such changes are evident during inflammation and, in many cases, long after healing of the damaged tissues, when the nervous system fails to reset back to normal. Neuroplasticity within distinct populations of neurons has a fundamental role in the aberrant motility, secretion and sensation associated with common clinical gastrointestinal disorders. To find appropriate therapeutic treatments for these disorders, the extent and time course of neuroplasticity must be fully appreciated.
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Abstract
Modeling visceral pain requires an appreciation of the underlying neurobiology of visceral sensation, including characteristics of visceral pain that distinguish it from pain arising from other tissues, the unique sensory innervation of visceral organs, the functional basis of visceral pain, and the concept of viscero-somatic and viscero-visceral convergence. Further, stimuli that are noxious when applied to the viscera are different than stimuli noxious to skin, muscle, and joints, thus informing model development and assessment. Visceral pain remains an important and understudied area of pain research and basic science knowledge and mechanisms acquired using animal models can translate into approaches that can be applied to the study and development of future therapeutics.
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Affiliation(s)
- Erica S Schwartz
- Center for Pain Research, Department of Anesthesiology, School of Medicine, University of Pittsburgh, W1444 BST-Starzl, 200 Lothrop St., Pittsburgh, PA, 15213, USA
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Luo J, Wang T, Liang S, Hu X, Li W, Jin F. Experimental gastritis leads to anxiety- and depression-like behaviors in female but not male rats. BEHAVIORAL AND BRAIN FUNCTIONS : BBF 2013; 9:46. [PMID: 24345032 PMCID: PMC3878489 DOI: 10.1186/1744-9081-9-46] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 12/10/2013] [Indexed: 02/08/2023]
Abstract
Human and animals studies support the idea that there is a gender-related co-morbidity of pain-related and inflammatory gastrointestinal (GI) diseases with psychological disorders. This co-morbidity is the evidence for the existence of GI-brain axis which consists of immune (cytokines), neural (vagus nerve) and neuroendocrine (HPA axis) pathways. Psychological stress causes disturbances in GI physiology, such as altered GI barrier function, changes in motility and secretion, development of visceral hypersensitivity, and dysfunction of inflammatory responses. Whether GI inflammation would exert impact on psychological behavior is not well established. We examined the effect of experimental gastritis on anxiety- and depression-like behaviors in male and female Sprague-Dawley rats, and evaluated potential mechanisms of action. Gastritis was induced by adding 0.1% (w/v) iodoacetamide (IAA) to the sterile drinking water for 7 days. Sucrose preference test assessed the depression-like behavior, open field test and elevated plus maze evaluated the anxiety-like behavior. IAA treatment induced gastric inflammation in rats of either gender. No behavioral abnormality or dysfunction of GI-brain axis was observed in male rats with IAA-induced gastritis. Anxiety- and depression-like behaviors were apparent and the HPA axis was hyperactive in female rats with IAA-induced gastritis. Our results show that gastric inflammation leads to anxiety- and depression-like behaviors in female but not male rats via the neuroendocrine (HPA axis) pathway, suggesting that the GI inflammation can impair normal brain function and induce changes in psychological behavior in a gender-related manner through the GI-to-brain signaling.
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Affiliation(s)
- Jia Luo
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Tao Wang
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
| | - Shan Liang
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xu Hu
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
| | - Wei Li
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Feng Jin
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
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Lee SE, Song HJ, Park SY, Nam Y, Min CH, Lee DY, Jeong JY, Ha HS, Kim HJ, Whang WK, Jeong JH, Kim IK, Kim HR, Min YS, Sohn UD. Effect of ECQ on Iodoacetamide-Induced Chronic Gastritis in Rats. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2013; 17:469-77. [PMID: 24227950 PMCID: PMC3823962 DOI: 10.4196/kjpp.2013.17.5.469] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 09/16/2013] [Accepted: 09/17/2013] [Indexed: 12/25/2022]
Abstract
This study investigated effect of extract containing quercetin-3-O-β-D-glucuronopyranoside from Rumex Aquaticus Herba (ECQ) against chronic gastritis in rats. To produce chronic gastritis, the animals received a daily intra-gastric administration of 0.1 ml of 0.15% iodoacetamide (IA) solution for 7 days. Daily exposure of the gastric mucosa to IA induced both gastric lesions and significant reductions of body weight and food and water intake. These reductions recovered with treatment with ECQ for 7 days. ECQ significantly inhibited the elevation of the malondialdehyde levels and myeloperoxidase activity, which were used as indices of lipid peroxidation and neutrophil infiltration. ECQ recovered the level of glutathione, activity of superoxide dismutase (SOD), and expression of SOD-2. The increased levels of total NO concentration and iNOS expression in the IA-induced chronic gastritis were significantly reduced by treatment with ECQ. These results suggest that the ECQ has a therapeutic effect on chronic gastritis in rats by inhibitory actions on neutrophil infiltration, lipid peroxidation and various steps of reactive oxygen species (ROS) generation.
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Affiliation(s)
- Se Eun Lee
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea
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Dai F, Lei Y, Li S, Song G, Chen JDZ. Desvenlafaxine succinate ameliorates visceral hypersensitivity but delays solid gastric emptying in rats. Am J Physiol Gastrointest Liver Physiol 2013; 305:G333-9. [PMID: 23764892 DOI: 10.1152/ajpgi.00224.2012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Desvenlafaxine succinate (DVS) is a novel serotonin and norepinephrine reuptake inhibitor. The aim of this study was to investigate the effects of DVS on visceral hypersensitivity and solid gastric emptying in a rodent model of gastric hyperalgesia. Twenty-eight gastric hyperalgesia rats and 20 control rats were used. Visceral sensitivity during gastric distention (GD) was assessed by recording of electromyogram (EMG) at pressures of 20, 40, 60, and 80 mmHg. DVS with doses of 1, 10, and 30 mg/kg were administrated by gavage, 5-HT1A antagonist (WAY-100635, 0.3 mg/kg) was given subcutaneously, and 5-HT2A antagonist (ketanserin, 1 mg/kg) was given intraperitoneally. The level of norepinephrine in plasma was measured by enzyme-linked immunosorbent assay. We found that 1) visceral hypersensitivity induced by acetic acid was validated. 2) DVS dose-dependently reduced visceral hypersensitivity in the gastric hypersensitivity rats. The EMG (% of baseline value without GD) during GD at 60 and 80 mmHg with DVS at a dose of 30 mg/kg were 119.4 ± 2.3% (vs. saline 150.9 ± 2.7%, P < 0.001) and 128.2 ± 3.2% (vs. saline 171.1 ± 2.4%, P < 0.001). Similar findings were observed at a dose of 10 mg/kg. DVS at a dose of 1 mg/kg reduced visceral hypersensitivity only during GD at 60 mmHg. 3) Neither WAY-100635 nor ketanserin blocked the effect of DVS on visceral sensitivity. 4) DVS at 30 mg/kg significantly increased plasma NE level (P = 0.012 vs. saline). 5) DVS at 30 mg/kg significantly delayed solid gastric emptying (P < 0.05 vs. saline). We conclude that DVS reduces visceral sensitivity in a rodent model of visceral hypersensitivity and delays solid gastric emptying. Caution should be made when DVS is used for treating patients.
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Affiliation(s)
- Fei Dai
- Ningbo Pace Translational Medical Research Center, Beilun, Ningbo, China.
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Activation of p38 MAPK through transient receptor potential A1 in a rat model of gastric distension-induced visceral pain. Neuroreport 2013; 24:68-72. [DOI: 10.1097/wnr.0b013e32835c7df2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Keto Y, Hirata T, Takemoto Y, Yamano M, Yokoyama T. Influence of gastric acid on gastric emptying and gastric distension-induced pain response in rats--effects of famotidine and mosapride. Neurogastroenterol Motil 2012; 24:147-53, e88. [PMID: 22066725 DOI: 10.1111/j.1365-2982.2011.01809.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Gastroduodenal acidification has been reported to aggravate upper abdominal discomfort and pain that are symptoms suffered by functional dyspepsia (FD) patients. Delayed gastric emptying and hypersensitivity to gastric distension (GD) contribute importantly to the pathophysiology of FD. METHODS In the present study, we determined the influence of pentagastrin-stimulated endogenous gastric acid on gastric emptying and GD-induced pain responses using rat model systems. Moreover, we evaluated the effects of famotidine and mosapride on changes in gastric emptying and the GD-induced pain response to gastric acid hypersecretion. Gastric emptying was measured by excretion of glass beads that had been intragastrically administered with a liquid nutrient, and gastric pain response was evaluated by observing whether a GD-induced increase in mean blood pressure occurred. KEY RESULTS Pentagastrin (2 mg kg(-1), s.c.) which markedly and continuously stimulated gastric acid secretion, significantly delayed and enhanced respectively, gastric emptying and pain compared with saline-injected groups. Oral famotidine (0.1-3 mg kg(-1)) and mosapride (0.3-3 mg kg(-1)) administration in a dose-dependent manner accelerated the delay of gastric emptying. Furthermore, famotidine (0.3-3 mg kg(-1)) significantly alleviated the aggravation of the GD-induced pain response, but mosapride (10 mg kg(-1)) did not. CONCLUSIONS & INFERENCES We established rat models to evaluate the effect of gastric acid hypersecretion on gastric emptying and the GD-induced pain response. In these models, acid hypersecretion delayed gastric emptying and aggravated the pain response. Furthermore, we showed that famotidine ameliorated both delayed gastric emptying and gastric hypersensitivity, whereas mosapride only improved delayed gastric emptying.
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Affiliation(s)
- Y Keto
- Applied Pharmacology Research Laboratories, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, Japan.
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Hargrave SL, Kinzig KP. Repeated gastric distension alters food intake and neuroendocrine profiles in rats. Physiol Behav 2011; 105:975-81. [PMID: 22115950 DOI: 10.1016/j.physbeh.2011.11.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 11/07/2011] [Accepted: 11/07/2011] [Indexed: 12/23/2022]
Abstract
The consumption of a large food bolus leads to stomach distension. Gastric distension potently signals the termination of a meal by stimulating gastric mechanoreceptors and activating neuroendocrine circuitry. The ability to terminate a meal is altered in disorders such as bulimia nervosa (BN), binge-eating disorder (BED) and certain subtypes of obesity in which large quantities of food are frequently ingested. When a large meal is consumed, the stomach is rapidly stretched. We modeled this rapid distension of the stomach in order to determine if the neuroendocrine abnormalities present in these disorders, including increased gastric capacit3y, leptin dysregulation, and alterations in neuropeptide Y (NPY), and proopiomelanocortin (POMC) expression, were influenced by the rapid stretch aspect of repeatedly consuming a large meal. To test the effects of repeated gastric distension (RGD) on neuroendocrine factors involved in energy homeostasis, a permanent intra-gastric balloon was implanted in rats, and briefly inflated daily for 4 weeks. Though body weights and daily food intakes remained equivalent in RGD and control rats, a significant delay in the onset of feeding was present during the first and second, but not the third and fourth weeks of inflations. Despite equivalent body weights and daily caloric consumption, RGD animals had significantly decreased leptin levels (p<0.05), and tended to have increased fasting arcuate NPY levels (p=0.08), which were suppressed more than control animals following food intake (control and RGD decreases from baseline were 184.95% and 257.42%, respectively). NPY expression in the nucleus of the solitary tract followed a similar pattern. These data demonstrate that the act of regularly distending the stomach can have effects on the regulation of energy balance that are independent from those related to caloric consumption, and may be related to disorders such as BN, BED, and certain types of obesity in which meal termination is impaired.
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Affiliation(s)
- Sara L Hargrave
- Department of Psychological Sciences and Ingestive Behavior Research Center, Purdue University, West Lafayette, IN 47907, USA.
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Wang Z, Bradesi S, Charles JR, Pang RD, Maarek JMI, Mayer EA, Holschneider DP. Functional brain activation during retrieval of visceral pain-conditioned passive avoidance in the rat. Pain 2011; 152:2746-2756. [PMID: 21944154 DOI: 10.1016/j.pain.2011.08.022] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Revised: 07/23/2011] [Accepted: 08/22/2011] [Indexed: 01/21/2023]
Abstract
This study assessed functional brain activation in rats during expectation of visceral pain. Male rats were trained in step-down passive avoidance (PA) for 2 days. Upon stepping down from a platform, conditioned animals received noxious colorectal distension delivered through a colorectal balloon, whereas the balloon in control rats remained uninflated. On day 3, PA behavior was assessed while [(14)C]-iodoantipyrine was infused intravenously, followed by immediate euthanasia. Regional cerebral blood flow-related tissue radioactivity (rCBF) was analyzed by statistical parametric mapping using 3-dimensional brains reconstructed from autoradiographic brain slice images. Associated with retrieved PA behavior, conditioned rats compared with control subjects showed increases in rCBF in sensory (anterior insula, somatosensory cortex), limbic/paralimbic regions (anterior cingulate, prelimbic cortex, amygdala), all regions previously reported to show activation during acute visceral pain. Increases in rCBF were also noted in the dorsal hippocampus, nucleus accumbens, and caudate putamen, regions associated with retrieval of PA. Organization of the underlying brain network was further delineated by functional connectivity analysis. This revealed in conditioned rats a strongly and positively connected corticostriatal cluster (cingulate, prelimbic cortex, caudate putamen). The amygdala and cerebellar hemispheres formed another positively connected cluster, which was negatively connected with the corticostriatal cluster, suggesting corticolimbic modulation. Prelimbic cortex, nucleus accumbens, and anterior insula emerged in conditioned animals as hubs. Our results show that during retrieval of PA, brain areas implicated in PA expression as well as those implicated in acute visceral pain processing were recruited, in line with findings from human brain imaging studies on pain expectation.
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Affiliation(s)
- Zhuo Wang
- Center for the Neurobiology of Stress, Department of Medicine, University of California, Los Angeles, CA, USA Department of Psychiatry and the Behavioral Sciences, University of Southern California, Los Angeles, CA, USA Veterans Administration, Greater Los Angeles Healthcare System, Los Angeles, CA, USA Department of Chemistry and Biochemistry, California State University, Los Angeles, CA, USA Program in Neuroscience, University of Southern California, Los Angeles, CA, USA Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA Departments of Physiology, Psychiatry and Biobehavioral Sciences, Brain Research Institute, University of California, Los Angeles, CA, USA Departments of Cell and Neurobiology, Neurology, University of Southern California, Los Angeles, CA, USA
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Seto Y, Yoshida N, Kaneko H. Effects of mosapride citrate, a 5-HT4-receptor agonist, on gastric distension-induced visceromotor response in conscious rats. J Pharmacol Sci 2011; 116:47-53. [PMID: 21521930 DOI: 10.1254/jphs.11012fp] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
Mosapride citrate (mosapride), a prokinetic agent with 5-HT(4)-receptor agonistic activity, is known to enhance gastric emptying and alleviate symptoms in patients with functional dyspepsia (FD). As hyperalgesia and delayed gastric emptying play an important role in the pathogenesis of FD, we used in this study balloon gastric distension to enable abdominal muscle contractions and characterized the visceromotor response (VMR) to such distension in conscious rats. We also investigated the effects of mosapride on gastric distension-induced VMR in the same model. Mosapride (3-10 mg/kg, p.o.) dose-dependently inhibited gastric distension-induced VMR in rats. However, itopride even at 100 mg/kg failed to inhibit gastric distension-induced VMR in rats. Additionally, a major metabolite M1 of mosapride, which possesses 5-HT(3)-receptor antagonistic activity, inhibited gastric distension-induced VMR. The inhibitory effect of mosapride on gastric distension-induced visceral pain was partially, but significantly inhibited by SB-207266, a selective 5-HT(4)-receptor antagonist. This study shows that mosapride inhibits gastric distension-induced VMR in conscious rats. The inhibitory effect of mosapride is mediated via activation of 5-HT(4) receptors and blockage of 5-HT(3) receptors by a mosapride metabolite. This finding indicates that mosapride may be useful in alleviating FD-associated gastrointestinal symptoms via increase in pain threshold.
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Affiliation(s)
- Yasuhiro Seto
- Genomic Research Laboratories, Dainippon Sumitomo Pharma. Co., Ltd., Suita, Osaka 564-0053, Japan
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Miwa H, Kondo T, Oshima T, Fukui H, Tomita T, Watari J. Esophageal sensation and esophageal hypersensitivity - overview from bench to bedside. J Neurogastroenterol Motil 2010; 16:353-62. [PMID: 21103417 PMCID: PMC2978388 DOI: 10.5056/jnm.2010.16.4.353] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 08/13/2010] [Accepted: 08/19/2010] [Indexed: 12/19/2022] Open
Abstract
Noxious stimuli in the esophagus activate nociceptive receptors on esophageal mucosa, such as transient receptor potential, acid-sensing ion channel and the P2X family, a family of ligand-gated ion channels responsive to ATP, and this generates signals that are transmitted to the central nervous system via either spinal nerves or vagal nerves, resulting in esophageal sensation. Among the noxious stimuli, gastric acid and other gastric contents are clinically most important, causing typical reflux symptoms such as heartburn and regurgitation. A conventional acid penetration theory has been used to explain the mechanism of heartburn, but much recent evidence does not support this theory. Therefore, it may be necessary to approach the causes of heartburn symptoms from a new conceptual framework. Hypersensitivity of the esophagus, like that of other visceral organs, includes peripheral, central and probably psychosocial factor-mediated hypersensitivity, and is known to play crucial roles in the pathoegenesis of nonerosive reflux disease, functional heartburn and non-cardiac chest pain. There also are esophagitis patients who do not perceive typical symptoms. This condition is known as silent gastroesophageal reflux disease. Although the pathogenesis of silent gastroesophageal reflux disease is still not known, hyposensitivity to reflux of acid may possibly explain the condition.
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Affiliation(s)
- Hiroto Miwa
- Division of Upper Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
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Oshima T, Koseki J, Sakurai J, Watari J, Matsumoto T, Miwa H. NK-1 receptor is involved in the decreased movement in a rat chronic acid reflux oesophagitis model. Neurogastroenterol Motil 2010; 22:579-84, e125. [PMID: 20059697 DOI: 10.1111/j.1365-2982.2009.01450.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND We previously reported that rats with reflux oesophagitis (RE) show a decrease in voluntary movement, which could be used as a measure of chronic visceral symptoms. However, what mediates these symptoms is still unknown, and pain-related neuropeptides or their receptors in oesophageal mucosa are possibly related to the symptom generation of oesophagitis. In the present study, we investigated the role of NK-1 receptor (NK-1R) as a mediator of oesophagitis symptoms. METHODS Chronic RE was surgically induced using rats. The degree or severity of oesophageal symptoms was evaluated by assessing voluntary movement, which was monitored using an infrared sensor system. The NK-1R antagonist, L-732,138, was administered and changes in voluntary movement were assessed. Ten days after surgery, the rats were killed to examine the oesophagus. NK-1R and tachykinin-1 mRNA were detected by real-time RT-PCR. NK-1R protein expression was examined by Western blotting. KEY RESULTS Voluntary movement of the oesophagitis model rats was significantly lower than that of the sham-operated rats on day 10. The size of oesophageal mucosal erosion did not correlate with the amount of voluntary movement. The amount of NK-1R protein and mRNA in the oesophageal tissue was significantly higher at both the erosion and non-erosion sites. The amount of tachykinin-1 mRNA in oesophageal tissue at the non-erosion sites was significantly higher in oesophagitis rats. The voluntary movement of oesophagitis rats was significantly increased by the administration of L-732,138. CONCLUSIONS & INFERENCES The NK-1R and related neuropeptides are possibly involved in the decrease in voluntary movement of RE.
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Affiliation(s)
- T Oshima
- Division of Upper Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan
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Abstract
The mechanism of visceral pain is still less understood compared with that of somatic pain. This is primarily due to the diverse nature of visceral pain compounded by multiple factors such as sexual dimorphism, psychological stress, genetic trait, and the nature of predisposed disease. Due to multiple contributing factors there is an enormous challenge to develop animal models that ideally mimic the exact disease condition. In spite of that, it is well recognized that visceral hypersensitivity can occur due to (1) sensitization of primary sensory afferents innervating the viscera, (2) hyperexcitability of spinal ascending neurons (central sensitization) receiving synaptic input from the viscera, and (3) dysregulation of descending pathways that modulate spinal nociceptive transmission. Depending on the type of stimulus condition, different neural pathways are involved in chronic pain. In early-life psychological stress such as maternal separation, chronic pain occurs later in life due to dysregulation of the hypothalamic-pituitary-adrenal axis and significant increase in corticotrophin releasing factor (CRF) secretion. In contrast, in early-life inflammatory conditions such as colitis and cystitis, there is dysregulation of the descending opioidergic system that results excessive pain perception (i.e., visceral hyperalgesia). Functional bowel disorders and chronic pelvic pain represent unexplained pain that is not associated with identifiable organic diseases. Often pain overlaps between two organs and approximately 35% of patients with chronic pelvic pain showed significant improvement when treated for functional bowel disorders. Animal studies have documented that two main components such as (1) dichotomy of primary afferent fibers innervating two pelvic organs and (2) common convergence of two afferent fibers onto a spinal dorsal horn are contributing factors for organ-to-organ pain overlap. With reports emerging about the varieties of peptide molecules involved in the pathological conditions of visceral pain, it is expected that better therapy will be achieved relatively soon to manage chronic visceral pain.
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Miranda A, Mickle A, Medda B, Zhang Z, Phillips RJ, Tipnis N, Powley TL, Shaker R, Sengupta JN. Altered mechanosensitive properties of vagal afferent fibers innervating the stomach following gastric surgery in rats. Neuroscience 2009; 162:1299-306. [PMID: 19477237 DOI: 10.1016/j.neuroscience.2009.05.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2009] [Revised: 05/11/2009] [Accepted: 05/20/2009] [Indexed: 02/01/2023]
Abstract
BACKGROUND AND AIMS Several types of gastric surgeries have been associated with early satiety, dyspepsia and food intolerances. We aimed to examine alterations in gastric vagal afferents following gastric surgery-fundus ligation. METHODS Six week old, male Sprague-Dawley rats underwent chronic ligation (CL) of the fundus. Sham rats underwent abdominal surgery, but without ligation. Another group of rats underwent acute ligation (AL) of the fundus immediately prior to experiments. CL and sham rats were allowed to grow to age 3-4 months. Food intake and weights were recorded post-operatively. Gastric compliance and gastric wall thickness was measured at baseline and during gastric distension (GD). Extracellular recordings were made to examine response characteristics of vagal afferent fibers to GD and to map the stomach receptive field (RF). The morphological structures of afferent terminals in the stomach were examined with retrograde tracings from the nodose ganglion. RESULTS The CL group consumed significantly less food and weighed less than sham control. The mean compliance of the CL group was significantly less than control, but higher than the AL group. The spontaneous firing and responses to GD of afferent fibers from the CL rats were significantly higher than AL rats. There was a marked expansion of the gastric RF in the CL rats with significant reorganization and regeneration of intramuscular array (IMA) terminals. There was no difference in total wall or muscle thickness among the groups. CONCLUSION CL results in aberrant remodeling of IMAs with expansion of the gastric RF and alters the mechanotransduction properties of vagal afferent fibers. These changes could contribute to altered sensitivity following gastric surgery.
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Affiliation(s)
- A Miranda
- Division of Gastroenterology, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
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Abstract
Changes in primary sensory neurons are likely to contribute to the emergence of chronic visceral pain. An important step in understanding visceral pain is the development of comprehensive phenotypes that combines functional and anatomical properties for these neurons. We developed a novel ex vivo physiology preparation in mice that allows intracellular recording from colon sensory neurons during colon distension, in the presence and absence of pharmacologic agents. This preparation also allows recovery of functionally characterized afferents for histochemical analysis. Recordings obtained from L6 dorsal root ganglion cells in C57BL/6 mice identified two distinct populations of distension-responsive colon afferents: high-firing frequency (HF) and low-firing frequency (LF) cells. Fluid distension of the colon elicited rapid firing (>20 Hz) in HF cells, whereas LF cells seldom fired >5 Hz. Distension response thresholds were significantly lower in HF cells (LF, 17.5 +/- 1.1 cmH(2)O; HF, 2.6 +/- 1.0 cmH(2)O). Responses of most LF afferents to colon distension were sensitized by luminal application of capsaicin (1 microm; 8 of 9 LF cells), mustard oil (100 microm; 10 of 12 LF cells), and low pH (pH 4.0; 5 of 6 LF cells). In contrast, few HF afferents were sensitized by capsaicin (3 of 9), mustard oil (2 of 7), or low pH (1 of 6) application. Few HF afferents (4 of 23) expressed the capsaicin receptor, TRPV1. In contrast, 87% (25 of 29) of LF afferents expressed TRPV1. TRPV1 has been shown to be required for development of inflammatory hyperalgesia. These results suggest a unique functional role of TRPV1-positive colon afferents that could be exploited to design specific therapies for visceral hypersensitivity.
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Does Helicobacter pylori-induced inflammation of gastric mucosa determine the severity of symptoms in functional dyspepsia? J Gastroenterol 2009; 44:66-70. [PMID: 19159074 DOI: 10.1007/s00535-008-2271-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2007] [Accepted: 08/06/2008] [Indexed: 02/04/2023]
Abstract
BACKGROUND Inflammation induces some structural and biochemical alterations and oxidative damage in gastric tissue. In this study, we aimed to investigate the relationship among the severity of symptoms, oxidative stress, and grading scales of Helicobacter pylori-induced gastric inflammation in functional dyspepsia. METHODS Thirty-five patients with functional dyspepsia were enrolled in the study. The severity of dyspepsia within the last 6 months was evaluated by Glasgow Dyspepsia Severity Score. In biopsy specimens of gastric mucosa, severity of gastritis was estimated by the revised Sydney Classification System, and oxidative stress parameters were studied. RESULTS Although there was no statistically significant relationship between symptom scores and degree of chronic inflammation, a tendency for symptoms to be more severe has been observed in low levels of gastritis. Levels of sulfhydryl groups were lower in subjects with high levels of chronic inflammation, and Helicobacter pylori intensity (P < 0.001 and P = 0.02, respectively). Levels of malondialdehyde were higher in subjects with high levels of chronic inflammation (P = 0.04). There was a statistically significant but a weak positive correlation between symptom scores and sulfhydryl levels (P < 0.001, r = 0.323). CONCLUSIONS In conclusion, there may be an inverse relation between severity of symptoms and level of Helicobacter pylori induced gastric inflammation or oxidative stress in patients with functional dyspepsia.
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Miwa H, Oshima T, Sakurai J, Tomita T, Matsumoto T, Iizuka S, Koseki J. Experimental oesophagitis in the rat is associated with decreased voluntary movement. Neurogastroenterol Motil 2009; 21:296-303. [PMID: 19126182 DOI: 10.1111/j.1365-2982.2008.01221.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Growing interest has arisen regarding the mechanism of dyspeptic symptom generation. However, no evaluation system of these symptoms in animals has been developed. In this study, we examined whether voluntary movement of rats could be a measure to assess visceral symptoms of reflux oesophagitis. A chronic acid reflux oesophagitis model was made using rats, and the size of erosions was measured. Omeprazole was administered to the oesophagitis rats for 10 days. The amount of voluntary movement was measured by an infrared sensor. Intracellular spaces in oesophageal epithelium were also measured using a emission electron microscope. NP-40 soluble and insoluble fractions of claudins were examined by Western blot. Voluntary movement was significantly lower in the oesophagitis model rats than in the sham-operated rats (P < 0.01). Although omeprazole reduced the size of erosions, it did not significantly affect the total amount of voluntary movement (r = -0.033, P = 0.916). Intracellular spaces were significantly dilated in the oesophagitis model rats and claudin-3 showed a significantly lower relative quantity in the NP-40 insoluble fraction. Omeprazole significantly increased voluntary movement of oesophagitis model rats and the relative quantity of claudin-3 in the insoluble fraction (P < 0.05). Dilated intercellular spaces and the lower level of claudin-3 may relate to the voluntary movement of oesophagitis model rats. Decreases in voluntary movement of oesophagitis model rats may reflect visceral symptoms and be able to serve as an index of chronic abdominal symptoms.
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Affiliation(s)
- H Miwa
- Division of Upper Gastroenteroelogy, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan.
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Liu LS, Winston JH, Shenoy MM, Song GQ, Chen JDZ, Pasricha PJ. A rat model of chronic gastric sensorimotor dysfunction resulting from transient neonatal gastric irritation. Gastroenterology 2008; 134:2070-9. [PMID: 18448102 DOI: 10.1053/j.gastro.2008.02.093] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2007] [Revised: 02/23/2008] [Accepted: 02/28/2008] [Indexed: 02/08/2023]
Abstract
BACKGROUND & AIMS Although several pathophysiologic abnormalities have been noted in functional dyspepsia (FD), their pathogenesis is poorly understood. We hypothesized that chronic gastric hypersensitivity and gastric motor dysfunction seen in FD patients can be modeled in rats by transient gastric irritation during the neonatal period, a time of known neuronal vulnerability to long-term plasticity. METHODS Ten-day-old male rats received 0.2 mL 0.1% iodoacetamide (IA) in 2% sucrose daily by oral gavages for 6 days; controls received 2% sucrose. Rats in both groups were then followed to adulthood (8-10 weeks) at which point behavioral, visceromotor, and great splanchnic nerve responses to graded gastric balloon distention (GD; 20-80 mm Hg) and gastric motor function were tested. RESULTS IA-treated rats exhibited hypersensitivity to GD in a dose-dependent manner, as compared with the control group. The threshold of afferent nerve activation was lower and nerve responses to GD were significantly increased in IA-treated rats. Although IA-treated rats ingested food at a lower rate, gastric emptying was not significantly different between IA and control groups. However, gastric accommodation was significantly reduced in the IA group. No significant gastric pathology was seen in hypersensitive adult rats compared with controls. CONCLUSIONS These studies demonstrate that gastric irritation in the neonatal period can result in chronic gastric hypersensitivity and gastric motor dysfunction in adults even in the absence of significant detectable gastric pathology. Our results offer insight into the pathogenesis of chronic functional dyspepsia and provide a potential model for further study to this important clinical problem.
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Affiliation(s)
- Lian-Sheng Liu
- Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University School of Medicine, Stanford, California 94305-5187, USA
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Christianson JA, Gebhart GF. Assessment of colon sensitivity by luminal distension in mice. Nat Protoc 2008; 2:2624-31. [PMID: 17948005 DOI: 10.1038/nprot.2007.392] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Colorectal distension (CRD) is a widely used and reliable method for evaluating colon sensitivity in unanesthetized animals, including humans. Hollow organ distension is a mechanical stimulus that replicates in humans the sensation and pattern of referral of their visceral pain. In animals, CRD has been employed to evaluate drug efficacy, strain, sex or genetic differences and changes in colon sensitivity after inflammation or irritation of the distal colon. Responses to CRD are measured as electromyographic (EMG) recordings of the abdominal musculature, termed the visceromotor response. This protocol will provide sufficient detail to allow an investigator to surgically prepare a mouse for CRD, construct distending balloons, distend the colon, and accumulate and analyze data from EMG recordings; examples are also provided to illustrate typical experimental outcomes. CRD recording sessions are typically 2 h in duration.
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Affiliation(s)
- Julie A Christianson
- Department of Anesthesiology, Center for Pain Research, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania 15261, USA
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Painsipp E, Wultsch T, Shahbazian A, Edelsbrunner M, Kreissl MC, Schirbel A, Bock E, Pabst MA, Thoeringer CK, Huber HP, Holzer P. Experimental gastritis in mice enhances anxiety in a gender-related manner. Neuroscience 2007; 150:522-36. [PMID: 17945426 DOI: 10.1016/j.neuroscience.2007.09.024] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Revised: 09/12/2007] [Accepted: 09/17/2007] [Indexed: 01/01/2023]
Abstract
There is a gender-related comorbidity of pain-related and inflammatory bowel diseases with psychiatric diseases. Since the impact of experimental gastrointestinal inflammation on the emotional-affective behavior is little known, we examined whether experimental gastritis modifies anxiety, stress coping and circulating corticosterone in male and female Him:OF1 mice. Gastritis was induced by adding iodoacetamide (0.1%) to the drinking water for at least 7 days. Inflammation was assessed by gastric histology and myeloperoxidase activity, circulating corticosterone determined by enzyme immunoassay, anxiety-related behavior evaluated with the elevated plus maze and stress-induced hyperthermia tests, and depression-like behavior estimated with the tail suspension test. Iodoacetamide-induced gastritis was associated with gastric mucosal surface damage and an increase in gastric myeloperoxidase activity, this increase being significantly larger in female mice than in male mice. The rectal temperature of male mice treated with iodoacetamide was enhanced, whereas that of female mice was diminished. The circulating levels of corticosterone were reduced by 65% in female mice treated with iodoacetamide but did not significantly change in male mice. On the behavioral level, iodoacetamide treatment caused a decrease in nocturnal home-cage activity, drinking and feeding. While depression-related behavior remained unaltered following induction of gastritis, behavioral indices of anxiety were significantly enhanced in female but not male mice. There was no correlation between the estrous cycle and anxiety as well as circulating corticosterone. Radiotracer experiments revealed that iodoacetamide did not readily enter the brain, the blood-brain ratio being 20:1. Collectively, these data show that iodoacetamide treatment causes gastritis in a gender-related manner, its severity being significantly greater in female than in male mice. The induction of gastritis in female mice is associated with a reduction of circulating corticosterone and an enforcement of behavioral indices of anxiety. Gastric inflammation thus has a distinct gender-dependent influence on emotional-affective behavior and its neuroendocrine control.
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Affiliation(s)
- E Painsipp
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, A-8010 Graz, Austria
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Nagabukuro H, Berkley KJ. Influence of endometriosis on visceromotor and cardiovascular responses induced by vaginal distention in the rat. Pain 2007; 132 Suppl 1:S96-S103. [PMID: 17544211 PMCID: PMC2323582 DOI: 10.1016/j.pain.2007.04.039] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Revised: 04/20/2007] [Accepted: 04/30/2007] [Indexed: 11/27/2022]
Abstract
This study examined pseudoaffective responses elicited by vaginal distention in urethane-anesthetized rats, and tested hypotheses that responses would be increased by endometriosis (ENDO) and vary with the estrous cycle. Three groups were studied: ENDO, shamENDO, and Naive. ENDO was induced by autotransplanting small pieces of uterine horn (or, for shamENDO, fat) on mesenteric arteries. Ten weeks later, rats in proestrus or metestrus were anesthetized with urethane. Distendable latex balloons were inserted into the vaginal canal. While an increasing series of vaginal distentions was delivered, changes in electromyographic activity of the external oblique musculature (visceromotor response, VMR) and mean arterial pressure (pressor) responses were simultaneously measured. Vaginal distention produced VMR and pressor responses in all groups. These responses were significantly greater in ENDO than in the other groups, and greater in proestrus than metestrus. Although the overall amount of cystic tissue was greater in proestrous than metestrous rats, there was no correlation between these amounts and VMR or pressor responses. Acute spinalization (T8-T9) and bilateral pelvic, but not hypogastric, neurectomy attenuated both VMR and pressor responses, supporting the hypothesis that vaginal nociception involves suprathoracic spinal processing of information conveyed by the pelvic nerve. These effects on VMR and pressor responses to vaginal distention parallel behavioral escape responses to the same stimuli reported previously. The findings encourage continued use of VMR and pressor responses for further investigation of mechanisms underlying pain associated with ENDO and its potential treatment.
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Affiliation(s)
- Hiroshi Nagabukuro
- Program in Neuroscience, Florida State University, Tallahassee, FL 32306-1270, USA
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Increase in gastric acid-induced afferent input to the brainstem in mice with gastritis. Neuroscience 2007; 145:1108-19. [PMID: 17303342 DOI: 10.1016/j.neuroscience.2006.12.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2006] [Revised: 11/25/2006] [Accepted: 12/12/2006] [Indexed: 01/17/2023]
Abstract
Acid challenge of the gastric mucosa is signaled to the brainstem. This study examined whether mild gastritis due to dextrane sulfate sodium (DSS) or iodoacetamide (IAA) enhances gastric acid-evoked input to the brainstem and whether this effect is related to gastric myeloperoxidase activity, gastric histology, gastric volume retention or cyclooxygenase stimulation. The stomach of conscious mice was challenged with NaCl (0.15 M) or HCl (0.15 and 0.25 M) administered via gastric gavage. Two hours later, activation of neurons in the nucleus tractus solitarii (NTS) was visualized by c-Fos immunocytochemistry. Gastritis was induced by DSS (molecular weight 8000; 5%) or IAA (0.1%) added to the drinking water for 7 days. Relative to NaCl, intragastric HCl increased the number of c-Fos protein-expressing cells in the NTS. Pretreatment with DSS or IAA for 1 week did not alter the c-Fos response to NaCl but significantly enhanced the response to HCl by 54 and 74%, respectively. Either pretreatment elevated gastric myeloperoxidase activity and induced histological injury of the mucosal surface. In addition, DSS caused dilation of the gastric glands and damage to the parietal cells. HCl-induced gastric volume retention was not altered by IAA but attenuated by DSS pretreatment. Indomethacin (5 mg/kg) failed to significantly alter HCl-evoked expression of c-Fos in the NTS of control, DSS-pretreated and IAA-pretreated mice. We conclude that the gastritis-evoked increase in the gastric acid-evoked c-Fos expression in the NTS is related to disruption of the gastric mucosal barrier, mucosal inflammation, mucosal acid influx and enhanced activation of the afferent stomach-NTS axis.
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Bielefeldt K, Zhong F, Koerber HR, Davis BM. Phenotypic characterization of gastric sensory neurons in mice. Am J Physiol Gastrointest Liver Physiol 2006; 291:G987-97. [PMID: 16728726 DOI: 10.1152/ajpgi.00080.2006] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Recent studies suggest that the capsaicin receptor [transient receptor potential vanilloid (TRPV)1] may play a role in visceral mechanosensation. To address the potential role of TRPV1 in vagal sensory neurons, we developed a new in vitro technique allowing us to determine TRPV1 expression directly in physiologically characterized gastric sensory neurons. Stomach, esophagus, and intact vagus nerve up to the central terminations were carefully dissected and placed in a perfusion chamber. Intracellular recordings were made from the soma of nodose neurons during mechanical stimulation of the stomach. Physiologically characterized neurons were labeled iontophoretically with neurobiotin and processed for immunohistochemical experiments. As shown by action potential responses triggered by stimulation of the upper thoracic vagus with a suction electrode, essentially all abdominal vagal afferents in mice conduct in the C-fiber range. Mechanosensitive gastric afferents encode stimulus intensities over a wide range without apparent saturation when punctate stimuli are used. Nine of 37 mechanosensitive vagal afferents expressed TRPV1 immunoreactivity, with 8 of the TRPV1-positive cells responding to stretch. A small number of mechanosensitive gastric vagal afferents express neurofilament heavy chains and did not respond to stretch. By maintaining the structural and functional integrity of vagal afferents up to the nodose ganglion, physiological and immunohistochemical properties of mechanosensory gastric sensory neurons can be studied in vitro. Using this novel technique, we identified TRPV1 immunoreactivity in only one-fourth of gastric mechanosensitive neurons, arguing against a major role of this ion channel in sensation of mechanical stimuli under physiological conditions.
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Affiliation(s)
- Klaus Bielefeldt
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
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Sugiura T, Dang K, Lamb K, Bielefeldt K, Gebhart GF. Acid-sensing properties in rat gastric sensory neurons from normal and ulcerated stomach. J Neurosci 2006; 25:2617-27. [PMID: 15758172 PMCID: PMC6725180 DOI: 10.1523/jneurosci.2894-04.2005] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Gastric acid contributes to dyspeptic symptoms, including abdominal pain, in patients with disorders of the proximal gastrointestinal tract. To examine the molecular sensor(s) of gastric acid chemonociception, we characterized acid-elicited currents in dorsal root ganglion (DRG) and nodose ganglion (NG) neurons that innervate the stomach and examined their modulation after induction of gastric ulcers. A fluorescent dye (DiI) was injected into the stomach wall to retrogradely label gastric sensory neurons. After 1-2 weeks, gastric ulcers were induced by 45 s of luminal exposure of the stomach to 60% acetic acid injected into a clamped area of the distal stomach; control animals received saline. In whole-cell voltage-clamp recordings, all gastric DRG neurons and 55% of NG neurons exhibited transient, amiloride-sensitive, acid-sensing ion-channel (ASIC) currents. In the remaining 45% of NG neurons, protons activated a slow, sustained current that was attenuated by the transient receptor potential vanilloid subtype 1 antagonist, capsazepine. The kinetics and proton sensitivity of amiloride-sensitive ASIC currents differed between NG and DRG neurons. NG neurons had a lower proton sensitivity and faster kinetics, suggesting expression of specific subtypes of ASICs in the vagal and splanchnic innervation of the stomach. Effects of Zn2+ and N,N,N',N'-tetrakis-(2-pyridylmethyl)-ethylenediamine on acid-elicited currents suggest contributions of ASIC1a and ASIC2a subunits. Gastric ulcers altered the properties of acid-elicited currents by increasing pH sensitivity and current density and changing current kinetics in gastric DRG neurons. The distinct properties of NG and DRG neurons and their modulation after injury suggest differential contributions of vagal and spinal afferent neurons to chemosensation and chemonociception.
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Affiliation(s)
- Takeshi Sugiura
- Department of Pharmacology, Carver College of Medicine, The University of Iowa, Iowa City, Iowa 52242, USA
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Lamb K, Zhong F, Gebhart GF, Bielefeldt K. Experimental colitis in mice and sensitization of converging visceral and somatic afferent pathways. Am J Physiol Gastrointest Liver Physiol 2006; 290:G451-7. [PMID: 16195421 DOI: 10.1152/ajpgi.00353.2005] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Chronic pain syndromes affecting different organs often coexist. We hypothesized that sensitization of one afferent pathway may affect converging input from other areas of the body. We induced colitis in mice with 2,4,6-trinitrobenzenesulfonic acid (TNBS); control animals were treated with equal volumes of vehicle (50% ethanol) only. Visceromotor responses to graded colorectal distension, cystometrograms, and response thresholds to mechanical and thermal stimulation of both hind paws were determined on days 7 and 14. Inflammation of colon and bladder was assessed with validated histological markers and scores. TNBS caused significant colitis on day 7 that resolved by day 14; there was no evidence of bladder inflammation. There was a significant hypersensitivity to colorectal distension on day 7, which returned to normal on day 14. This was associated with bladder overactivity, as demonstrated by early onset of micturition and more frequent micturition on day 7 after TNBS administration. Colitis also significantly altered responses to mechanical and thermal stimulation of both hind paws on day 7 but not day 14. We conclude that cross talk between afferent visceral and somatic pathways may contribute to the coexistence of pain syndromes.
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Affiliation(s)
- Kenneth Lamb
- Department of Pharmacology, University of Iowa, Iowa City, Iowa, USA
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de Lange RPJ, Geerse GJ, Dahlhaus M, van Laar TJ, Wiegant VM, Stam R. Altered brain stem responsivity to duodenal pain after a single stressful experience. Neurosci Lett 2005; 381:144-8. [PMID: 15882806 DOI: 10.1016/j.neulet.2005.02.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2004] [Revised: 02/07/2005] [Accepted: 02/08/2005] [Indexed: 10/25/2022]
Abstract
A single session of foot shock stress produces stable and long lasting sensitization of behavioral, hormonal and intestinal motility responses to novel stressful stimuli in laboratory rats. This is reflected in increased expression of the activity marker protein Fos in brain areas involved, following an external stressor. We present data from awake, freely moving rats in which a silicone balloon was surgically implanted in the duodenum. Firstly, cardiovascular reflexes to distentions were studied using telemetry with surgically implanted transmitters, 2 weeks after a single, 15-min session of foot shocks. The distentions caused characteristic, bi-phasic responses in both mean arterial blood pressure and heart rate that were not different between preshocked and control animals. Secondly, the numbers of Fos immunopositive cells were quantified in selected brain areas, 1 h after repeated distention of the duodenum. We found an increase in distention-induced Fos in preshocked rats in the nucleus tractus solitarius and a weaker effect in the central nucleus of the amygdala. This could be a first indication that altered visceral afferent processing in previously stressed rats, found earlier for the colon, may be a general and not an organ-specific phenomenon.
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Affiliation(s)
- R P J de Lange
- Rudolf Magnus Institute of Neuroscience, P.O. Box 80040, 3508 TA Utrecht, The Netherlands
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Römer M, Painsipp E, Schwetz I, Holzer P. Facilitation of gastric compliance and cardiovascular reaction by repeated isobaric distension of the rat stomach. Neurogastroenterol Motil 2005; 17:399-409. [PMID: 15916627 PMCID: PMC4370837 DOI: 10.1111/j.1365-2982.2005.00649.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Gastric distension causes cardiovascular reactions and enhances gastric compliance. Here, we investigated how these responses are related to each other, whether they change upon repeated distension and which neural mechanisms are involved. Mean arterial blood pressure (MAP) in phenobarbital-anaesthetized rats was recorded from a carotid artery and gastric compliance determined with an electronic barostat. Runs of intermittent gastric distension were generated by stepwise increments (5 mmHg) of intragastric (IG) pressure. While gastric compliance peaked at IG pressures of 20 mmHg, the change in MAP (predominantly hypotension) was largest at IG pressures beyond 30 mmHg. Repeated distension enhanced the MAP response to IG pressures beyond 35 mmHg, whereas gastric compliance was facilitated primarily at IG pressures below 20 mmHg. This facilitation of gastric compliance depended on the magnitude of the preceding distension. The MAP response to distension was enhanced by nitric oxide synthase inhibition, inhibited by subdiaphragmatic vagotomy but hardly affected by coeliac ganglionectomy. The facilitation of gastric compliance was changed by vagotomy in a complex manner but left unaltered by the other interventions. These findings show that isobaric gastric distension elicits both MAP and gastric compliance responses whose characteristics, mechanisms and sensitization properties differ profoundly.
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Affiliation(s)
- M Römer
- Department of Experimental and Clinical Pharmacology, Medical University of Graz, Graz, Austria
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Kang YM, Lamb K, Gebhart GF, Bielefeldt K. Experimentally induced ulcers and gastric sensory-motor function in rats. Am J Physiol Gastrointest Liver Physiol 2005; 288:G284-91. [PMID: 15388487 DOI: 10.1152/ajpgi.00250.2004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Prior studies have demonstrated that inflammation can sensitize visceral afferent neurons, contributing to the development of hyperalgesia. We hypothesized that both afferent and efferent pathways are affected, resulting in changes in motor and sensory function. Kissing ulcers (KU) were induced in the distal stomach by injecting 60% acetic acid for 45 s into a clamped area of the stomach. In controls, saline was injected into the stomach. A balloon catheter was surgically placed into the stomach, and electromyographic responses to gastric distension were recorded from the acromiotrapezius muscle at various times after ulcer induction. The accommodation reflex was assessed by slowly infusing saline into the distally occluded stomach. Gastric pressure changes in response to vagal stimulation were measured in anesthetized rats. Contractile function of circular muscle strips was examined in vitro using force-displacement transducers. KU caused gastric hypersensitivity that persisted for at least 14 days. Fluid distension of the stomach led to a rapid pressure increase in KU but not in control animals, consistent with an impaired accommodation reflex. Gastric ulcers enhanced the contractile response to vagal stimulation, whereas the effect of cholinergic stimulation on smooth muscle in vitro was not changed. These data suggest that inflammation directly alters gastric sensory and motor function. Increased activation of afferents will trigger vagovagal reflexes, thereby further changing motility and indirectly activating sensory neurons. Thus afferent and efferent pathways both contribute to the development of dyspeptic symptoms.
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Affiliation(s)
- Y M Kang
- Department of Pharmacology, University of Iowa, Iowa City, Iowa, USA
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