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Hirayama M, Hoshino Y, Yoshii K, Toda R, Kawabata Y, Nakanishi T, Tamai I. Identification of the Uptake Transporter Responsible for Distribution of Acotiamide into Stomach Tissue. Mol Pharm 2020; 17:1071-1078. [PMID: 32105080 DOI: 10.1021/acs.molpharmaceut.9b00894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The acetylcholinesterase inhibitor, acotiamide, improves gastric motility and is clinically used to treat functional dyspepsia. The present study aimed to identify the transporters involved in the distribution of acotiamide in stomach tissue. Acotiamide uptake by the gastric cancer-derived model cell line, Hs746 T, was Na+- and pH-independent. The initial uptake velocity of acotiamide was saturable with increasing concentrations of acotiamide and was inhibited by selective serotonin reuptake inhibitors, which are potent inhibitors of the plasma membrane monoamine transporter (PMAT). The uptake of acotiamide by PMAT gene-transfected HEK293 cells was saturable, with similar Km (197.9 μM) values to those of uptake by Hs 746T cells (106 μM). Moreover, immunoreactivity of PMAT was found in the gastric smooth muscle and vascular endothelial cells. These results suggest that PMAT contributes to the distribution of acotiamide in the stomach, where it exerts its pharmacological effects.
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Affiliation(s)
- Masamichi Hirayama
- Toxicology & Pharmacokinetics Research, Central Research Laboratories, Zeria Pharmaceutical Corporation Ltd., Saitama 360-0111, Japan.,Institute of Medical Pharmaceutical and Health Sciences, Faculty of Pharmacy, Kanazawa University, Kanazawa 920-1192, Japan
| | - Yusuke Hoshino
- Toxicology & Pharmacokinetics Research, Central Research Laboratories, Zeria Pharmaceutical Corporation Ltd., Saitama 360-0111, Japan
| | - Kazuyoshi Yoshii
- Toxicology & Pharmacokinetics Research, Central Research Laboratories, Zeria Pharmaceutical Corporation Ltd., Saitama 360-0111, Japan
| | - Ryoko Toda
- Toxicology & Pharmacokinetics Research, Central Research Laboratories, Zeria Pharmaceutical Corporation Ltd., Saitama 360-0111, Japan
| | - Yoshihiro Kawabata
- Toxicology & Pharmacokinetics Research, Central Research Laboratories, Zeria Pharmaceutical Corporation Ltd., Saitama 360-0111, Japan
| | - Takeo Nakanishi
- Institute of Medical Pharmaceutical and Health Sciences, Faculty of Pharmacy, Kanazawa University, Kanazawa 920-1192, Japan
| | - Ikumi Tamai
- Institute of Medical Pharmaceutical and Health Sciences, Faculty of Pharmacy, Kanazawa University, Kanazawa 920-1192, Japan
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Karunanayake A, Rajindrajith S, de Silva HA, Gunawardena S, Devanarayana NM. Autonomic functions and gastric motility in children with functional abdominal pain disorders. World J Gastroenterol 2019; 25:95-106. [PMID: 30643361 PMCID: PMC6328964 DOI: 10.3748/wjg.v25.i1.95] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 12/01/2018] [Accepted: 12/13/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Abdominal pain-predominant functional gastrointestinal disorders (AP-FGIDs) are the most common cause of recurrent abdominal pain in children. Despite its high prevalence, the underlying pathophysiology of this condition is poorly understood.
AIM To assess the role of gastric dysmotility and autonomic nervous system dysfunction in the pathophysiology of AP-FGIDs.
METHODS One hundred children, fulfilling Rome III criteria for AP-FGIDs, and 50 healthy controls, aged 5 to 12 years, were recruited after obtaining parental consent. All patients were investigated for underlying organic disorders. Gastric motility and cardiovascular autonomic functions were assessed using validated non-invasive techniques.
RESULTS The main gastric motility parameters assessed (gastric emptying rate [45.7 vs 59.6 in controls], amplitude [48.7 vs 58.2], frequency of antral contractions [8.3 vs 9.4], and antral motility index [4.1 vs 6.4]) were significantly lower in children with AP-FGIDs (P < 0.05). The post-prandial antral dilatation at 1 min after the test meal significantly correlated with the severity of abdominal pain (P < 0.05). Assessment of autonomic functions in AP-FGID patients showed neither a significant difference compared to the control group, nor a correlation with gastric motility abnormalities (P > 0.05). The duration of pain episodes negatively correlated with the parasympathetic tone (maladaptive parasympathetic tone) (P < 0.05).
CONCLUSION Children with AP-FGIDs have abnormal gastric motility but normal cardiovascular autonomic functions. There is no relationship between abnormal gastric motility and autonomic functions. The pathogenesis of AP-FGIDs is not related to cardiovascular autonomic dysfunction.
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Affiliation(s)
- Amaranath Karunanayake
- Department of Physiology, Faculty of Medicine, University of Ruhuna, Karapitiya, Galle 80000, Sri Lanka
| | - Shaman Rajindrajith
- Department of Paediatrics, Faculty of Medicine, University of Kelaniya, Ragama 11010, Sri Lanka
| | | | - Sampath Gunawardena
- Department of Physiology, Faculty of Medicine, University of Ruhuna, Karapitiya, Galle 80000, Sri Lanka
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Devanarayana NM, Rajindrajith S, Benninga MA. Abdominal migraine in children: association between gastric motility parameters and clinical characteristics. BMC Gastroenterol 2016; 16:26. [PMID: 26924750 PMCID: PMC4770524 DOI: 10.1186/s12876-016-0435-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 02/17/2016] [Indexed: 12/12/2022] Open
Abstract
Background Approximately 0.2–1 % of children suffers from abdominal migraine (AM). Pathophysiology of AM has not been adequately studied. This study evaluated gastric motility in children with AM. Methods Seventeen children (6 boys), within an age range of 4–15 years, referred to a tertiary care paediatric unit, North Colombo Teaching Hospital Ragama, Sri Lanka, from 2007 to 2012, were screened. Those fulfilling Rome III criteria for AM were recruited after obtaining parental consent. None had clinical or laboratory evidence of organic disorders. Twenty healthy children (8 boys), with an age range of 4–14 years, were recruited as controls. Liquid gastric emptying rate (GE) and antral motility parameters were assessed using an ultrasound method. Results Average GE (41.6 % vs. 66.2 %, in controls), amplitude of antral contractions (A) (57.9 % vs. 89.0 %) and antral motility index (MI) (5.0 vs. 8.3) were lower and fasting antral area (1.8 cm2 vs. 0.6 cm2) was higher in children with AM (p < 0.01). No significant difference in the frequency of antral contractions (F) (8.8/3 min vs. 9.3/3 min, p = 0.08) was found between the two groups. Scores obtained for severity of abdominal pain had a negative correlation with A (r = −0.55, p = 0.03). Average duration of abdominal pain episodes correlated with GE (r = −0.58, p = 0.02). Negative correlations were observed between duration of AM and A (r = −0.55), F (r = −0.52), and MI (r = −0.57) (p < 0.05). Conclusions GE and antral motility parameters were significantly lower in children with AM. A significant correlation was found between symptoms and gastric motility. These findings suggest a possible role of abnormal gastric motility in the pathogenesis of AM.
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Affiliation(s)
- Niranga Manjuri Devanarayana
- Department of Physiology, Faculty of Medicine, University of Kelaniya, Thalagolla Road, Ragama, 11010, Sri Lanka.
| | - Shaman Rajindrajith
- Department of Paediatrics, Faculty of Medicine, University of Kelaniya, Thalagolla Road, Ragama, 11010, Sri Lanka
| | - Marc A Benninga
- Department of Pediatric Gastroenterology and Nutrition, Emma Children's Hospital, Academic Medical Centre, Amsterdam, The Netherlands
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Tominaga K, Fujikawa Y, Tsumoto C, Kadouchi K, Tanaka F, Kamata N, Yamagami H, Tanigawa T, Watanabe T, Fujiwara Y, Arakawa T. Disorder of autonomic nervous system and its vulnerability to external stimulation in functional dyspepsia. J Clin Biochem Nutr 2016; 58:161-5. [PMID: 27013784 PMCID: PMC4788403 DOI: 10.3164/jcbn.15-140] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 11/12/2015] [Indexed: 01/19/2023] Open
Abstract
To elucidate the role of autonomic nervous system in functional dyspepsia patients, we examined 24-h heart rate variability: the basal levels, responses after lunch, cold pressor and mental arithmetic tests, and the efficacy of an autonomic drug (tofisopam). The high-frequency component (HF: 0.15–0.40 Hz) and the ratio of HF to the low-frequency component (LF: 0.04–0.15 Hz; LF/HF ratio) were used as indicators of parasympathetic and sympathetic autonomic nervous system function. The HF component in the 24-h, daytime, and nighttime was low in 86.7%, 97.8%, and 66.7% of patients (n = 45) and the LF/HF ratio was high in 51.1%, 73.3%, and 26.6% of patients. Gastrointestinal symptom tended to be severe in patients with autonomic nervous system disorder (p = 0.085). The abnormal response in HF component after lunch occurred in 38.2% (13/34) of patients who revealed a greater tendency towards in indigestion score (p = 0.061). Delays in recovery to the basal autonomic nervous system level after stimulus of the cold pressor and the mental arithmetic tests occurred in parts of patients. Tofisopam partially improved autonomic nervous system dysfunction and abdominal pain/indigestion. Imbalanced autonomic nervous system function and vulnerability for recovery from external stimuli were observed in functional dyspepsia patients, which was associated with dyspeptic symptoms.
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Affiliation(s)
- Kazunari Tominaga
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Yoshiko Fujikawa
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan; Samurai GI Research Center, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Chikako Tsumoto
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Kaori Kadouchi
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Fumio Tanaka
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Noriko Kamata
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Hirokazu Yamagami
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Tetsuya Tanigawa
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Toshio Watanabe
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Yasuhiro Fujiwara
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
| | - Tetsuo Arakawa
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
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Yoshii K, Yamaguchi T, Hirayama M, Toda R, Kinomoto T, Kawabata Y, Chiba K. Distribution of acotiamide, an orally active acetylcholinesterase inhibitor, into the myenteric plexus of rat and dog stomachs. Life Sci 2016; 145:93-7. [DOI: 10.1016/j.lfs.2015.12.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 11/05/2015] [Accepted: 12/08/2015] [Indexed: 01/05/2023]
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Dalitong granule combined with electroacupuncture in the treatment of functional dyspepsia: A randomized controlled trial. Chin J Integr Med 2015; 21:743-50. [PMID: 26129900 DOI: 10.1007/s11655-015-2175-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To explore clinical short and long-term effect of combining dalitong granule (DG) and electroacupuncture group (EA) in the treatment of functional dyspepsia. METHODS Totally 640 patients with confirmed functional dyspepsia were randomly divided into 4 groups using a randomized digital table: the DG group, the EA group, the combined group and the control group, 160 cases in each group. The DG group was treated with 6 g DG 3 times daily; the EA group was treated with puncture of points Zusanli (ST36), Zhongwan (CV12), Neiguan (PC6), Taichong (LR3) and Gongsun (SP4) twice daily; the combined group with above-mentioned DG and EA; and the control group with 5 mg mosapride 3 times, 20 mg pantoprazole and 25 mg amitriptylines twice daily. The treatment course was 4 weeks for all groups. The symptom score, quality of life score by Short Form 36 Health Survey Questionnaires (SF-36), plasma motilin by radioimmunoassay, electrogastrographic frequencies by electrogastrogram (EGG) and gastric emptying by B-sonography were examined, and adverse reactions were observed before, at the end of treatment and 60 weeks post-treatment. RESULTS In the DG group 1 case dropped out for not taking medicine strictly and 1 case was lost to follow-up, while 1 case in the EA group and 2 cases in the combined therapy group were lost to follow-up. Compared with pre-treatment, quality of life score, plasma motilin, electrogastrographic frequencies and gastric emptying were all increased significantly, while symptom score was decreased significantly at the end of treatment in each group (P<0.01); in the combined group quality of life score, plasma motilin, electrogastrographic frequencies and gastric emptying were all significantly higher than those in the other groups, while symptom score was significantly lower than in the other groups (P<0.05). Compared with at the end of treatment, these indices changed insignificantly in the combined group and the EA group 60 weeks post-treatment (P>0.05), but the 4 increased indices were all decreased significantly, and symptom score was increased significantly in the DG and the control groups (P>0.05). The short and long-term total effective rates in the combined group were all significantly higher than those in the other treatment groups (P<0.05 or P<0.01). No serious adverse reaction occurred in the four groups. CONCLUSION Combined treatment of DG and EA could increase both plasma motilin and electrogastrographic frequencies, promote gastric emptying, alleviate the symptom of dyspepsia so as to increase quality of life, with better safety and long-term effect.
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Gomi A, Iino T, Nonaka C, Miyazaki K, Ishikawa F. Health benefits of fermented milk containing Bifidobacterium bifidum YIT 10347 on gastric symptoms in adults. J Dairy Sci 2015; 98:2277-83. [PMID: 25648808 DOI: 10.3168/jds.2014-9158] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 12/12/2014] [Indexed: 12/19/2022]
Abstract
We conducted a preliminary open trial (trial 1) and a double-blind, placebo-controlled, crossover trial (trial 2) to examine how fermented milk containing the probiotic Bifidobacterium bifidum YIT 10347 affects gastric and lower abdominal symptoms in adults taking no medication. In trial 1, subjects with or without gastric and lower abdominal symptoms ingested fermented milk containing B. bifidum YIT 10347 daily for 2 wk. In trial 2, subjects with gastric symptoms ingested fermented milk containing B. bifidum YIT 10347 (active preparation) or placebo daily for 2 wk, followed by crossover for 3 wk after a washout period. Before (baseline) and 1 and 2 wk after ingestion, subjects completed a questionnaire. In trial 1 (305 subjects), the prevalence of gastric and lower abdominal symptoms was 46 and 58%, respectively, at baseline. Ingestion of B. bifidum YIT 10347 significantly decreased the prevalence of gastric and lower abdominal symptoms from 45 to 33% at 1 wk and to 28% at 2 wk, and from 57 to 40% at 2 wk, respectively. In subjects with gastric symptoms at baseline, the average gastric symptom score per subject significantly decreased by 0.9 at 1 wk and 1.2 at 2 wk. In trial 2 (27 subjects), ingestion of the active preparation significantly decreased the average gastric symptoms score per subject by 1.0 at 1 wk and 1.1 at 2 wk, but ingestion of placebo milk had no effect. No side effects were reported by any subjects in either trial. We conclude that fermented milk containing B. bifidum YIT 10347 has the potential to provide health benefits by alleviating gastric symptoms in subjects taking no medication.
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Affiliation(s)
- A Gomi
- Yakult Central Institute, Kunitachi, Tokyo 186-8650, Japan.
| | - T Iino
- Yakult Central Institute, Kunitachi, Tokyo 186-8650, Japan
| | - C Nonaka
- Faculty of Research and Development, Yakult Honsha, Shimbashi, Tokyo 105-8660, Japan
| | - K Miyazaki
- Yakult Central Institute, Kunitachi, Tokyo 186-8650, Japan
| | - F Ishikawa
- Yakult Central Institute, Kunitachi, Tokyo 186-8650, Japan
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Nakano M, Oka S, Tanaka S, Aoyama T, Watari I, Hayashi R, Miyaki R, Nagai K, Sanomura Y, Yoshida S, Ueno Y, Chayama K. Clinical usefulness of classification by transabdominal ultrasonography for detection of small-bowel stricture. Scand J Gastroenterol 2013; 48:1041-7. [PMID: 23906185 DOI: 10.3109/00365521.2013.822546] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To assess the clinical usefulness of transabdominal ultrasonography (TUS) for detection of small-bowel stricture. PATIENTS AND METHODS Subjects were 796 patients undergoing double-balloon endoscopy (DBE), December 2003-October 2011. All underwent TUS prior to DBE. The TUS findings were classified by type as intestinal narrowing and distension at the oral side (Type A); extensive bowel wall thickening (Type B); focal bowel wall thickening (Type C) or no abnormality detected (Type D). We compared TUS findings against DBE findings with respect to small-bowel stricture, defined as failure of the enteroscope to pass through the small bowel. RESULTS Small-bowel stricture was detected by DBE in 11.3% (90/796) of patients. Strictures resulted from Crohn's disease (n = 36), intestinal tuberculosis (n = 24), malignant lymphoma (n = 9), ischemic enteritis (n = 6), NSAID ulcer (n = 5), radiation enteritis (n = 2), surgical anastomosis (n = 2) and other abnormalities (n = 6). Stricture was detected by TUS in 93.3% (84/90) of patients, and each such stricture fell into one of the three types of TUS abnormality. The remaining 6 strictures were detected only by DBE. DBE-identified strictures corresponded to TUS findings as follows: 100% (43/43) to Type A, 59.1% (29/49) to Type B, 14.8% (12/81) to Type C and 1% (6/623) to Type D. Correspondence between stricture and the Type A classification (vs. Types B, C and D) was significantly high, as was correspondence between stricture and Type B (vs. Types C and D). CONCLUSIONS TUS was shown to be useful for detecting small-bowel stricture. We recommend performing TUS first when a small-bowel stricture is suspected.
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Affiliation(s)
- Makoto Nakano
- Department of Gastroenterology and Metabolism, Graduate School of Biomedical Sciences, Hiroshima University , Hiroshima , Japan
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Devanarayana NM, Rajindrajith S, Perera MS, Nishanthanie SW, Benninga MA. Gastric emptying and antral motility parameters in children with functional dyspepsia: association with symptom severity. J Gastroenterol Hepatol 2013; 28:1161-6. [PMID: 23517336 DOI: 10.1111/jgh.12205] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/13/2013] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND AIMS Functional dyspepsia (FD) is an important gastrointestinal problem with obscure etiology. Abnormal gastric motility is suggested as a possible pathophysiological mechanism for symptoms. The main objective of this study was to assess gastric motility in Sri Lankan children with FD. METHODS Forty-one children (19 [46.3%] males, age 4-14 years, mean 7.5 years, SD 2.6 years) referred to the Gastroenterology Research Laboratory, Faculty of Medicine, University of Kelaniya, from January 2007 to December 2011, were screened. Those fulfilling Rome III criteria for FD were recruited. None had clinical or laboratory evidence of organic disorders. Twenty healthy children were recruited as controls (eight [40%] males, age 4-14 years, mean 8.4 years, SD 3.0 years). Liquid gastric emptying rate (GE) and antral motility parameters were assessed using an ultrasound-based method. RESULTS Average GE (45.6% vs 66.2% in controls), amplitude of antral contractions (58.2% vs 89.0%) and antral motility index (5.1 vs 8.3) were lower and fasting antral area (1.5 cm(2) vs 0.6 cm(2)) was higher in patients with FD (P < 0.01). Frequency of antral contractions (8.8 vs 9.3) did not show a significant difference (P = 0.07). Scores obtained for severity of abdominal pain negatively correlated with GE (r = -0.35, P = 0.025). Children with FD, exposed to stressful events had higher fasting antral area (1.9 cm(2)) than those not exposed to stress (1.0 cm(2)) (P = 0.02). CONCLUSIONS GE and antral motility parameters were significantly impaired in children with FD compared with controls. GE negatively correlated with severity of symptoms. This study points to disturbances in gastric motility as an etiological factor for FD.
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Liu B, Piao X, Guo L. Effect of herbal formula Xiao Pi-II on functional dyspepsia. J TRADIT CHIN MED 2013; 33:298-302. [DOI: 10.1016/s0254-6272(13)60168-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Nagahama K, Matsunaga Y, Kawachi M, Ito K, Tanaka T, Hori Y, Oka H, Takei M. Acotiamide, a new orally active acetylcholinesterase inhibitor, stimulates gastrointestinal motor activity in conscious dogs. Neurogastroenterol Motil 2012; 24:566-74, e256. [PMID: 22429221 DOI: 10.1111/j.1365-2982.2012.01912.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
UNLABELLED BACKGROUND Acotiamide hydrochloride (acotiamide), a novel selective acetylcholinesterase (AChE) inhibitor, has proven significantly effective in treating functional dyspepsia (FD) in clinical trials, particularly in alleviating meal-related symptoms. In the present study, we examined the gastrointestinal prokinetic effects of acotiamide administered orally or intraduodenally in conscious dogs and investigated in vivo and ex vivo anti-AChE activity of acotiamide to clarify its mechanism of prokinetic action. METHODS Gastrointestinal motility was measured in conscious dogs with chronically implanted force transducers. KEY RESULTS Oral administration of acotiamide stimulated postprandial gastroduodenal and colonic motor activities. Measurement of gastrointestinal motility showed that acotiamide, like itopride and mosapride, enhanced gastric antral motility. Further, acotiamide markedly improved clonidine (an α(2) -adrenoceptor agonist)-induced hypomotility in a dog model of gastric motor dysfunction. The postprandial gastric antral motility enhanced by acotiamide was completely abolished on treatment with the muscarinic receptor antagonist atropine. Results of an in vivo experiment on anti-AChE activity showed clearly increased acetylcholine-induced gastric motility on intraduodenal administration of acotiamide, just as observed with the AChE inhibitor neostigmine. Further, in ex vivo experiment, intraduodenal administration of acotiamide significantly inhibited AChE activity in canine gastric antrum. CONCLUSIONS & INFERENCES Our findings revealed that acotiamide administered through the alimentary tract exerts gastroprokinetic action via cholinergic pathways by inhibiting AChE activity. These results may also confirm the mechanism of action in clinical efficacy of acotiamide on FD.
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Affiliation(s)
- K Nagahama
- Central Research Laboratories, Zeria Pharmaceutical Co., Ltd., Saitama, Japan.
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Ecabet sodium induces neuronal nitric oxide synthase-derived nitric oxide synthesis and gastric adaptive relaxation in the human stomach. J Gastroenterol 2010; 44:1118-24. [PMID: 19685003 DOI: 10.1007/s00535-009-0113-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2008] [Accepted: 07/20/2009] [Indexed: 02/07/2023]
Abstract
BACKGROUND Gastric adaptive relaxation (GAR) is a major factor of functional dyspepsia (FD). Nitric oxide (NO) could be the key molecule responsible for GAR. We previously reported that the physiological gastric reservoir ability can be evaluated by measuring the cross-sectional area of the proximal stomach by abdominal ultrasonography (US). Ecabet sodium (ES), a gastro-protective antiulcer agent, has been shown to improve symptoms in FD patients. We examined the effects of ES on GAR in humans and on NO synthesis in vitro. METHODS GAR was measured by US in 14 subjects, 8 of whom had a pressure sensor inserted into their stomach, after treatment with ES, placebo, or no drugs. NO was measured in SH-SY 5Y cells using a fluorescent indicator. Neuronal, endothelial and inducible NO synthase (nNOS, eNOS and iNOS, respectively) expressions were examined in SH-SY 5Y cells by Western blotting. RESULTS Compared to placebo, ES induced significantly greater dilatation of the proximal stomach after the subjects drank 300-400 ml water (P < 0.05). After ES intake, the intragastric pressure did not change significantly, but it tended to be lower (n = 8; P = 0.15). ES increased NO production and nNOS expression, but not iNOS or eNOS expression, in SH-SY 5Y cells in vitro. Pretreatment with non-selective NO synthase (NOS) inhibitor, but not with iNOS-selective inhibitor, reduced NO production by ES. CONCLUSION ES may promote GAR in humans through nNOS-related NO; therefore, it may be useful for patients with FD.
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Matsumoto Y, Ito M, Kamino D, Tanaka S, Haruma K, Chayama K. Relation between histologic gastritis and gastric motility in Japanese patients with functional dyspepsia: evaluation by transabdominal ultrasonography. J Gastroenterol 2008; 43:332-7. [PMID: 18592150 DOI: 10.1007/s00535-008-2172-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2007] [Accepted: 02/01/2008] [Indexed: 02/04/2023]
Abstract
BACKGROUND Whether mucosal inflammation affects gastric motility in patients with functional dyspepsia (FD) is controversial. Few reports discuss gastric motility in relation to histologic gastritis. We examined the relation between gastric motility and histologic gastritis in Japanese patients with FD. METHODS Subjects were 198 patients examined by ultrasonography (US) and endoscopic biopsy. Histologic gastritis scores were compared to three US gastric motility indices: the motility index (MI), gastroduodenal reflux index (RI), and gastric emptying rate (GER). In cases of gastritis with a high inflammation score (score 2-3), the macrophages in biopsy specimens were counted and compared to the motility indices. RESULTS Of the 198 patients, 159 were Helicobacter pylori positive. Comparison of 39 age-and sex-matched H. pylori-positive and 39 H. pylori-negative patients showed that the MI was lower in H. pylori-positive patients (6.78+/-2.17 vs. 7.63+/-2.35, P<0.05), and the RI was higher (5.64+/-4.70 vs. 2.13+/-2.58, P<0.01). Among H. pylori-positive patients, US revealed a decreased MI in patients with a high inflammation score (score 2-3) in the antrum compared with the MI of those with a low inflammation score (score 0-1) (6.52+/-2.38 vs. 7.82+/-1.89, P<0.01). The number of macrophages was not associated with motility indices in patients with a high inflammation score. CONCLUSION Histologic gastritis with severe inflammation may inhibit gastric motility.
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Affiliation(s)
- Yoshiaki Matsumoto
- Department of Medicine and Molecular Science, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan
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