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Young LEA, Conroy LR, Clarke HA, Hawkinson TR, Bolton KE, Sanders WC, Chang JE, Webb MB, Alilain WJ, Vander Kooi CW, Drake RR, Andres DA, Badgett TC, Wagner LM, Allison DB, Sun RC, Gentry MS. In situ mass spectrometry imaging reveals heterogeneous glycogen stores in human normal and cancerous tissues. EMBO Mol Med 2022; 14:e16029. [PMID: 36059248 PMCID: PMC9641418 DOI: 10.15252/emmm.202216029] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 07/25/2022] [Accepted: 08/03/2022] [Indexed: 01/19/2023] Open
Abstract
Glycogen dysregulation is a hallmark of aging, and aberrant glycogen drives metabolic reprogramming and pathogenesis in multiple diseases. However, glycogen heterogeneity in healthy and diseased tissues remains largely unknown. Herein, we describe a method to define spatial glycogen architecture in mouse and human tissues using matrix-assisted laser desorption/ionization mass spectrometry imaging. This assay provides robust and sensitive spatial glycogen quantification and architecture characterization in the brain, liver, kidney, testis, lung, bladder, and even the bone. Armed with this tool, we interrogated glycogen spatial distribution and architecture in different types of human cancers. We demonstrate that glycogen stores and architecture are heterogeneous among diseases. Additionally, we observe unique hyperphosphorylated glycogen accumulation in Ewing sarcoma, a pediatric bone cancer. Using preclinical models, we correct glycogen hyperphosphorylation in Ewing sarcoma through genetic and pharmacological interventions that ablate in vivo tumor growth, demonstrating the clinical therapeutic potential of targeting glycogen in Ewing sarcoma.
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Affiliation(s)
- Lyndsay E A Young
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
- Markey Cancer CenterUniversity of KentuckyLexingtonKYUSA
| | - Lindsey R Conroy
- Markey Cancer CenterUniversity of KentuckyLexingtonKYUSA
- Department of Neuroscience, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Harrison A Clarke
- Department of Neuroscience, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Tara R Hawkinson
- Department of Neuroscience, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Kayli E Bolton
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - William C Sanders
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Josephine E Chang
- Department of Neuroscience, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Madison B Webb
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Warren J Alilain
- Department of Neuroscience, College of MedicineUniversity of KentuckyLexingtonKYUSA
- Spinal Cord and Brain Injury Research CenterUniversity of KentuckyLexingtonKYUSA
| | - Craig W Vander Kooi
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
- Markey Cancer CenterUniversity of KentuckyLexingtonKYUSA
| | - Richard R Drake
- Cell and Molecular Pharmacology and Experimental TherapeuticsMedical University of South CarolinaCharlestonSCUSA
| | - Douglas A Andres
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Tom C Badgett
- Pediatric Hematology‐Oncology, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Lars M Wagner
- Pediatric Hematology‐OncologyDuke UniversityDurhamNCUSA
| | - Derek B Allison
- Department of Pathology and Laboratory Medicine, College of MedicineUniversity of KentuckyLexingtonKYUSA
| | - Ramon C Sun
- Markey Cancer CenterUniversity of KentuckyLexingtonKYUSA
- Department of Neuroscience, College of MedicineUniversity of KentuckyLexingtonKYUSA
- Spinal Cord and Brain Injury Research CenterUniversity of KentuckyLexingtonKYUSA
- Department of Biochemistry & Molecular Biology, College of MedicineUniversity of FloridaGainesvilleFLUSA
- Center for Advanced Spatial Biomolecule ResearchUniversity of FloridaGainesvilleFLUSA
| | - Matthew S Gentry
- Department of Molecular and Cellular Biochemistry, College of MedicineUniversity of KentuckyLexingtonKYUSA
- Markey Cancer CenterUniversity of KentuckyLexingtonKYUSA
- Department of Biochemistry & Molecular Biology, College of MedicineUniversity of FloridaGainesvilleFLUSA
- Center for Advanced Spatial Biomolecule ResearchUniversity of FloridaGainesvilleFLUSA
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Takagi M, Ito M, Morino H, Miura T, Oshida K, Suzuki M, Takemori H, Shibata T. Anti-Diarrheal Effects of Wood Creosote, Seirogan, in Japanese Patients. Reports 2019; 2:28. [DOI: 10.3390/reports2040028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Wood creosote, Seirogan, is a non-prescription drug used to treat diarrhea. However, reports of its clinical use are rare. Here, we report the efficacy of wood creosote (3 capsules daily) in alleviating diarrheal symptoms in 148 patients from 10 clinics in Osaka, Japan. Wood creosote was classified to be remarkably effective, effective, partially effective, or not effective on the basis of the degree of alleviation of diarrheal symptoms. The anti-diarrheal efficacy of wood creosote soft capsules did not differ between males and females. Younger patients (21–30 years) showed greater improvement in diarrhea symptoms than elderly patients (>61 years) did. Wood creosote soft capsules were remarkably effective (44 patients), effective (71 patients), and partially effective (13 patients) in alleviating diarrhea symptoms due to a variety of causes. To the best of our knowledge, this is the first report on the clinical effectiveness of wood creosote soft capsules in treating diarrhea.
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Zhang Z, Hamada H, Gerk PM. Selectivity of Dietary Phenolics for Inhibition of Human Monoamine Oxidases A and B. Biomed Res Int 2019; 2019:8361858. [PMID: 30809547 DOI: 10.1155/2019/8361858] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 12/12/2018] [Accepted: 12/31/2018] [Indexed: 01/07/2023]
Abstract
Monoamine oxidases (MAOs) regulate local levels of neurotransmitters such as dopamine, norepinephrine, and serotonin and thus have been targeted by drugs for the treatment of certain CNS disorders. However, recent studies have shown that these enzymes are upregulated with age in nervous and cardiac tissues and may be involved in degeneration of these tissues, since their metabolic mechanism releases hydrogen peroxide leading to oxidative stress. Thus, targeting these enzymes may be a potential anti-aging strategy. The purpose of this study was to compare the MAO inhibition and selectivity of selected dietary phenolic compounds, using a previously validated assay that would avoid interference from the compounds. Kynuramine metabolism by human recombinant MAO-A and MAO-B leads to formation of 4-hydroxyquinoline, with Vmax values of 10.2±0.2 and 7.35±0.69 nmol/mg/min, respectively, and Km values of 23.1±0.8 μM and 18.0±2.3 μM, respectively. For oral dosing and interactions with the gastrointestinal tract, curcumin, guaiacol, isoeugenol, pterostilbene, resveratrol, and zingerone were tested at their highest expected luminal concentrations from an oral dose. Each of these significantly inhibited both enzymes except for zingerone, which only inhibited MAO-A. The IC50 values were determined, and selectivity indices (MAO-A/MAO-B IC50 ratios) were calculated. Resveratrol and isoeugenol were selective for MAO-A, with IC50 values of 0.313±0.008 and 3.72±0.20 μM and selectivity indices of 50.5 and 27.4, respectively. Pterostilbene was selective for MAO-B, with IC50 of 0.138±0.013 μM and selectivity index of 0.0103. The inhibition of resveratrol (MAO-A) and pterostilbene (MAO-B) was consistent with competitive time-independent mechanisms. Resveratrol 4'-glucoside was the only compound which inhibited MAO-A, but itself, resveratrol 3-glucoside, and pterostilbene 4'-glucoside failed to inhibit MAO-B. Additional studies are needed to establish the effects of these compounds on MAO-A and/or MAO-B in humans.
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Gnessi L, Bacarea V, Marusteri M, Piqué N. Xyloglucan for the treatment of acute diarrhea: results of a randomized, controlled, open-label, parallel group, multicentre, national clinical trial. BMC Gastroenterol 2015; 15:153. [PMID: 26518158 PMCID: PMC4628347 DOI: 10.1186/s12876-015-0386-z] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 10/22/2015] [Indexed: 02/24/2023] Open
Abstract
Background There is a strong rationale for the use of agents with film-forming protective properties, like xyloglucan, for the treatment of acute diarrhea. However, few data from clinical trials are available. Methods A randomized, controlled, open-label, parallel group, multicentre, clinical trial was performed to evaluate the efficacy and safety of xyloglucan, in comparison with diosmectite and Saccharomyces in adult patients with acute diarrhea due to different causes. Patients were randomized to receive a 3-day treatment. Symptoms (stools type, nausea, vomiting, abdominal pain and flatulence) were assessed by a self-administered ad-hoc questionnaire 1, 3, 6, 12, 24, 48 and 72 h following the first dose administration. Adverse events were also recorded. Results A total of 150 patients (69.3 % women and 30.7 % men, mean age 47.3 ± 14.7 years) were included (n = 50 in each group). A faster onset of action was observed in the xyloglucan group compared with the diosmectite and S. bouliardii groups. At 6 h xyloglucan produced a statistically significant higher decrease in the mean number of type 6 and 7 stools compared with diosmectite (p = 0.031). Xyloglucan was the most efficient treatment in reducing the percentage of patients with nausea throughout the study period, particularly during the first hours (from 26 % at baseline to 4 % after 6 and 12 h). An important improvement of vomiting was observed in all three treatment groups. Xyloglucan was more effective than diosmectite and S. bouliardii in reducing abdominal pain, with a constant improvement observed throughout the study. The clinical evolution of flatulence followed similar patterns in the three groups, with continuous improvement of the symptom. All treatments were well tolerated, without reported adverse events. Conclusions Xyloglucan is a fast, efficacious and safe option for the treatment of acute diarrhea. Trial registration EudraCT number 2014-001814-24 (date: 2014-04-28) ISRCTN number: 90311828
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Affiliation(s)
- Lucio Gnessi
- Department of Experimental Medicine, University of Rome "La Sapienza", 00161, Rome, Italy.
| | - Vladimir Bacarea
- Department of Epidemiology, University of Medicine & Pharmacy, Targu-Mures, Romania.
| | - Marius Marusteri
- Department of Medical Informatics and Biostatistics, University of Medicine & Pharmacy, Targu-Mures, Romania.
| | - Núria Piqué
- Department of Microbiology and Parasitology, Pharmacy Faculty, Universitat de Barcelona, Diagonal Sud, Facultat de Farmàcia, Edifici A, Av Joan XXIII, 08028, Barcelona, Spain.
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Quynh ANT, Sharma N, Cho KK, Yeo TJ, Kim KB, Jeong CY, Min TS, Young KJ, Kim JN, Jeong DK. Efficacious rat model displays non-toxic effect with Korean beechwood creosote: a possible antibiotic substitute. BIOTECHNOL BIOTEC EQ 2014; 28:447-454. [PMID: 26019530 PMCID: PMC4433953 DOI: 10.1080/13102818.2014.931696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 03/03/2014] [Indexed: 12/03/2022] Open
Abstract
Wood creosote, an herbal anti-diarrheal and a mixture of major volatile compounds, was tested for its non-toxicological effects, using a rat model, with the objective to use the creosote as an antibiotic substitute. A total of 30 Sprague-Dawley rats were studied to form five groups with 6 rats each. Korea beechwood creosote was supplemented into three test groups with 0.03 g/kg, 0.07 g/kg and 0.1 g/kg body weight/day without antibiotic support, along with a positive control of Apramycin sulphate (at 0.5% of the daily feed) and a negative control. Korean beechwood creosote supplementation showed no negative effect on the body weight gain in comparison to the negative and the positive control groups and the feed conversion ratio was also comparable with that of the control groups. The clinical pathology parameters studied were also under the umbrella of normal range, including liver specific enzymes, blood glucose, total protein, blood urea nitrogen (BUN), which indicated no toxic effect of creosote at the given doses. The non-hepatotoxic effect was also confirmed using hepatic damage specific molecular markers like Tim-p1, Tim-p2 and Tgf-β1. The results suggested that Korean beechwood may be used as antibiotic substitute in weanling pigs feed without any toxic effect on the body. Although the antimicrobial properties of creosote were not absolutely similar to those of apramycin sulphate, they were comparable.
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Affiliation(s)
| | - Neelesh Sharma
- Faculty of Biotechnology, Jeju National University , Jeju , Korea
| | - Kwang Keun Cho
- Department of Animal Resources Technology, Gyeongnam National University of Science and Technology , Jinju , Korea
| | - Tae Jong Yeo
- Department of Animal Resources Technology, Gyeongnam National University of Science and Technology , Jinju , Korea
| | - Ki Beom Kim
- Korea Institute for Animal Products Quality Evaluation , Anyang , Korea
| | - Chul Yon Jeong
- Changjobio Research Institute, Changjobio Corporation , Jeju , Korea
| | - Tae Sun Min
- National Research Foundation (NRF), R&D Policy Team , Daejeon , Korea
| | - Kim Jae Young
- Swine Science & Technology Center, Gyeongnam National University of Science and Technology , Jinju , Korea
| | - Jin Nam Kim
- Faculty of Biotechnology, Jeju National University , Jeju , Korea
| | - Dong-Kee Jeong
- Faculty of Biotechnology, Jeju National University , Jeju , Korea
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Dubreuil JD. Antibacterial and antidiarrheal activities of plant products against enterotoxinogenic Escherichia coli. Toxins (Basel) 2013; 5:2009-41. [PMID: 24212181 PMCID: PMC3847712 DOI: 10.3390/toxins5112009] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 10/25/2013] [Accepted: 10/30/2013] [Indexed: 12/22/2022] Open
Abstract
Enterotoxigenic Escherichia coli (ETEC) produces two types of enterotoxins: heat-labile (LT) and heat-stable (STa and STb). These molecules are involved in the induction of secretory diarrhea in animals including humans. This condition is currently treated using a fluid replacement therapy and antibiotics. This treatment is often not available to people in developing countries, and several die from the condition provoke by ETEC. Over the years, plants and plant extracts have been use as traditional medicine to treat various gastrointestinal ailments including diarrhea. Many of these plant products have been claimed to be active against diarrhea, however few have been extensively studied. The main objective of this review was to gather the scattered information on the antidiarrheal activities reported for various plant products on ETEC. This includes two major effects: (1) The inhibitory effect on bacterial growth or viability and (2) The interference with ETEC enterotoxins activity upon the intestinal epithelium. We will focus on plant products and extracts for which we have major indications of their biological activity against ETEC and their enterotoxins. Because Vibrio cholerae toxin (CT) is structurally, antigenically and mechanistically related to LT, it will also be discussed in this review.
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Affiliation(s)
- J Daniel Dubreuil
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, Québec, Canada.
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Ho CL, Lin CY, Ka SM, Chen A, Tasi YL, Liu ML, Chiu YC, Hua KF. Bamboo vinegar decreases inflammatory mediator expression and NLRP3 inflammasome activation by inhibiting reactive oxygen species generation and protein kinase C-α/δ activation. PLoS One 2013; 8:e75738. [PMID: 24124509 PMCID: PMC3790849 DOI: 10.1371/journal.pone.0075738] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 08/16/2013] [Indexed: 11/18/2022] Open
Abstract
Bamboo vinegar (BV), a natural liquid derived from the condensation produced during bamboo charcoal production, has been used in agriculture and as a food additive, but its application to immune modulation has not been reported. Here, we demonstrated that BV has anti-inflammatory activities both in vitro and in vivo. BV reduced inducible nitric oxide synthase expression and nitric oxide levels in, and interleukin-6 secretion by, lipopolysaccharide-activated macrophages without affecting tumor necrosis factor-α secretion and cyclooxygenase-2 expression. The mechanism for the anti-inflammatory effect of BV involved decreased reactive oxygen species production and protein kinase C-α/δ activation. Furthermore, creosol (2-methoxy-4-methylphenol) was indentified as the major anti-inflammatory compound in BV. Impaired cytokine expression and NLR family, pyrin domain-containing 3 (NLRP3) inflammasome activation was seen in mice treated with creosol. These findings provide insights into how BV regulates inflammation and suggest that it may be a new source for the development of anti-inflammatory agents or a healthy supplement for preventing and ameliorating inflammation- and NLRP3 inflammasome-related diseases, including metabolic syndrome.
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Affiliation(s)
- Chen-Lung Ho
- Division of Wood Cellulose, Taiwan Forestry Research Institute, Taipei, Taiwan
| | - Chai-Yi Lin
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
| | - Shuk-Man Ka
- Graduate Institute of Aerospace and Undersea Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Ann Chen
- Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Yu-Ling Tasi
- Graduate Institute of Life Science, National Defense Medical Center, Taipei, Taiwan
| | - May-Lan Liu
- Department of Nutritional Science, Toko University, Chiayi, Taiwan
| | - Yi-Chich Chiu
- Department of Biomechatronic Engineering, National Ilan University, Ilan, Taiwan
| | - Kuo-Feng Hua
- Department of Biotechnology and Animal Science, National Ilan University, Ilan, Taiwan
- * E-mail:
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Lekhooa M, Walubo A, Du Plessis JJB, Matsabisa MG. Evaluation of traditional medicines II: the use of metabolite peak-kinetics to monitor PHELA in rat plasma. Afr J Tradit Complement Altern Med 2012; 9:73-80. [PMID: 23983357 DOI: 10.4314/ajtcam.v9i3s.9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PHELA is a herbal mixture of four African traditional medicinal plants that is under development by the Medical Research Council (MRC) for use as an immune stimulant in immune compromised individuals. Before major in vivo investigations could be conducted, there was a need to establish a plasma marker for concentration monitoring of PHELA. Chromatographic separation was achieved using a C18 RP column (250 mm × 4.6 mm × 5 µm), 70% acetonitrile in water and fluorescent detection. Three groups of rats (n=5) were administered with PHELA (15.4 mg/kg) and one rat from each group was sacrificed at 1, 2, 4, 6 and 8 hours. Surprisingly, on the HPLC analysis, none of the marker peaks of spiked plasma were detectable in the plasma of treated animals. Instead, a new peak was observed at 9.2 minutes, which implied that it was a metabolite of PHELA. Using peak area per unit plasma volume (PK-area/L), the relevant pharmacokinetic parameters were derived. The metabolite's half-life was 3.47±0.35 hours and reached maximum concentration at 4.67 ± 1.15 hrs. It was estimated that with once daily dosing of PHELA, the concentration at steady state (Css) would be 47.52 ± 5.94 PK-area/L with no drug accumulation (Acc index =.009 ± 0.004). In conclusion, the use of peak area per unit volume to derive pharmacokinetics of unknown compounds (Peak-kinetics) and to confirm ingestion of PHELA were demonstrated with a hope that they may appeal to those experiencing similar problems with monitoring of herbal products of which little is known.
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Affiliation(s)
- Makhotso Lekhooa
- Department of Pharmacology, University of the Free State, Francie van Ziyl Drive, Tygerberg 7505, Parow Valley, Cape Town, South Africa
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Fukumori R, Nakamichi N, Takarada T, Kambe Y, Matsushima N, Moriguchi N, Yoneda Y. Inhibition by 2-Methoxy-4-ethylphenol of Ca2+ Influx Through Acquired and Native N-Methyl-D-aspartate–Receptor Channels. J Pharmacol Sci 2010; 112:273-81. [DOI: 10.1254/jphs.09294fp] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Kuge T, Greenwood-Van Meerveld B, Sokabe M. Stress-induced breakdown of intestinal barrier function in the rat: reversal by wood creosote. Life Sci 2006; 79:913-8. [PMID: 16643959 DOI: 10.1016/j.lfs.2006.03.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2005] [Revised: 01/25/2006] [Accepted: 03/06/2006] [Indexed: 10/24/2022]
Abstract
Our previous studies demonstrated that wood creosote (Seirogan) inhibits intestinal secretion and normalizes the transport of electrolytes and water in rats subjected to restraint stress. The goal of the present study was to examine whether wood creosote has a protective effect against stress-induced breakdown of intestinal barrier function. F-344 rats were subjected to 90-min water avoidance stress (WAS) with wood creosote (30 mg/kg) or vehicle administered intragastrically 30 min prior to WAS. Sham stressed rats received wood creosote or vehicle treatment but did not experience the WAS. All rats were euthanized at the end of the WAS or sham-stress and the jejunum and colon were isolated. Epithelial transport was studied in modified Ussing chambers. Spontaneous secretion was assessed by electrophysiological measurement of the short circuit current (I(sc)) while electrical conductance (G) was calculated from the potential difference (PD) and I(sc) using Ohm's law. Intestinal permeability was defined by the mucosal-to-serosal flux of horseradish peroxidase (HRP). WAS significantly elevated basal I(sc) and G and increased epithelial permeability to HRP in the jejunum but not in the colon. Wood creosote resulted in a significant reduction of the stress-induced increase in I(sc), G and the mucosal-to-serosal flux of HRP compared to the vehicle-treated group. Wood creosote caused no significant effects in sham-stressed rats. The results suggest that oral administration of wood creosote may prevent stress-induced diarrhea by preventing aversive effects on small intestinal secretion and barrier function.
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Affiliation(s)
- Tomoo Kuge
- Taiko Pharmaceutical Co., Ltd., Suita, Osaka 564-0032, Japan
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Abstract
Wood creosote, the principal ingredient in Seirogan, has a long history as a known gastrointestinal microbicidal agent. When administered orally, the intraluminal concentration of wood creosote is not sufficiently high to achieve this microbicidal effect. Through further animal tests, we have shown that antimotility and antisecretory actions are the principal antidiarrheal effects of wood creosote. Wood creosote inhibits intestinal secretion induced by enterotoxins by blocking the Cl(-) channel on the intestinal epithelium. Wood creosote also decreases intestinal motility accelerated by mechanical, chemical, or electrical stimulus by the inhibition of the Ca(2+) influx into the smooth muscle cells. In this overview, the antimotility and antisecretory effects of wood creosote are compared with those of loperamide. Wood creosote was observed to inhibit stimulated colonic motility, but not normal jejunal motility. Loperamide inhibits normal jejunal motility, but not stimulated colonic motility. Both wood creosote and loperamide inhibit intestinal secretion accelerated by acetylcholine. Wood creosote was found to have greater antisecretory effects in the colon than loperamide. Based upon these findings, we conclude that the antidiarrheal effects of wood creosote are due to both antisecretory activity in the intestine and antimotility in the colon, but not due to the microbicidal activity as previously thought. Wood creosote was found to have no effects on normal intestinal activity. These conclusions are supported by the results of a recent clinical study comparing wood creosote and loperamide, which concluded that wood creosote was more efficacious in relieving abdominal pain and comparable to loperamide in relieving diarrhea.
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Affiliation(s)
- Koji Ataka
- Research Institute, Taiko Pharmaceutical Co. Ltd., 3-34-14 Uchihonmachi, Suita City 564-0032, Japan.
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Abstract
Wood creosote, a mixture of simple phenolic compounds, has long been used as an herbal antidiarrheal medicine. Previous studies have shown that wood creosote has antimotility activity on the gastrointestinal (GI) tract, although its mechanism of action is not completely understood. The in vitro efficacy of wood creosote on calcium mobilization in guinea pig colonic smooth muscle was evaluated using a digital video camera system mounted on an inverted fluorescence microscope. The effects of wood creosote on spontaneous periodic increases in the free cytosolic calcium concentration ([Ca(2+)](i)), acetylcholine (ACh)-enhanced periodic increases in [Ca(2+)](i), and tetrodotoxin- or nifedipine-resistant spontaneous periodic increases in [Ca(2+)](i) were evaluated. Wood creosote decreased the amplitude of spontaneous (IC(50)=21 microg/ml) and ACh-enhanced (IC(50)=40 microg/ml) periodic increases in [Ca(2+)](i) in guinea pig colonic smooth muscle. Wood creosote also decreased the amplitude of both tetrodotoxin- and nifedipine-resistant spontaneous periodic increases in [Ca(2+)](i). These results suggest that antimotility activity through inhibition of Ca(2+) mobilization in the GI tract is at least partially responsible for the antidiarrheal activity of wood creosote. Wood creosote may exert its antimotility effect, at least in part, on network regions of interstitial cells of Cajal, which act as pacemaker cells and mediators of neurotransmission in the GI tract.
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