|Subjective food hypersensitivity: assessment of enterochromaffin cell markers in blood and gut lavage fluid.|
|Jump to Full Text|
|PMID: 21887108 Owner: NLM Status: PubMed-not-MEDLINE|
|BACKGROUND: Food hypersensitivity is commonly suspected, but seldom verified. Patients with subjective food hypersensitivity suffer from both intestinal and extraintestinal health complaints. Abnormalities of the enterochromaffin cells may play a role in the pathogenesis. The aim of this study was to investigate enterochromaffin cell function in patients with subjective food hypersensitivity by measuring serum chromogranin A (CgA) and 5-hydroxytryptamine (5-HT, serotonin) in gut lavage fluid.
METHODS: Sixty-nine patients with subjective food hypersensitivity were examined. Twenty-three patients with inflammatory bowel disease and 35 healthy volunteers were included as comparison groups. CgA was measured in serum by enzyme-linked immunosorbent assay. Gut lavage fluid was obtained by administering 2 L of polyethylene glycol solution intraduodenally. The first clear fluid passed per rectum was collected and 5-HT was analyzed by liquid chromatography tandem mass spectrometry.
RESULTS: Serum levels of CgA were significantly lower in patients with subjective food hypersensitivity than in healthy controls (P = 0.04). No differences were found in 5-HT levels in gut lavage fluid between patients with subjective food hypersensitivity and the control groups. There was no correlation between serum CgA and gut lavage 5-HT.
CONCLUSION: Decreased blood levels of CgA suggest neuroendocrine alterations in patients with subjective food hypersensitivity. However, 5-HT levels in gut lavage fluid were normal.
|Kine Gregersen; Jørgen Valeur; Kristine Lillestøl; Livar Frøyland; Pedro Araujo; Gülen Arslan Lied; Arnold Berstad|
Related Documents :
|8477918 - Toxicological studies on debitterized neem oil (azadirachta indica).
16835098 - Constituents of the essential oil from aerial parts of chromolaena odorata from thailand.
18423768 - Influence of oil content on physicochemical properties and skin distribution of nile re...
18706468 - Chemistry, antioxidant and antimicrobial investigations on essential oil and oleoresins...
24351068 - Birch pollen sensitization with cross-reactivity to food allergens predominates in adul...
11958618 - Biodegradation of viticulture wastes by pleurotus: a source of microbial and human food...
|Type: Journal Article Date: 2011-08-10|
|Title: International journal of general medicine Volume: 4 ISSN: 1178-7074 ISO Abbreviation: Int J Gen Med Publication Date: 2011|
|Created Date: 2011-09-02 Completed Date: 2011-12-05 Revised Date: 2013-05-29|
Medline Journal Info:
|Nlm Unique ID: 101515487 Medline TA: Int J Gen Med Country: New Zealand|
|Languages: eng Pagination: 555-60 Citation Subset: -|
|Institute of Medicine, University of Bergen. email@example.com|
|APA/MLA Format Download EndNote Download BibTex|
Journal ID (nlm-ta): Int J Gen Med
Publisher: Dove Medical Press
© 2011 Gregersen et al, publisher and licensee Dove Medical Press Ltd.
Received Day: 9 Month: 8 Year: 2011
collection publication date: Year: 2011
Electronic publication date: Day: 10 Month: 8 Year: 2011
Volume: 4First Page: 555 Last Page: 560
PubMed Id: 21887108
Publisher Id: ijgm-4-555
|Subjective food hypersensitivity: assessment of enterochromaffin cell markers in blood and gut lavage fluid|
|Gülen Arslan Lied13|
1Institute of Medicine, University of Bergen
2National Institute of Nutrition and Seafood Research;
3Department of Medicine, Section for Gastroenterology, Haukeland University Hospital, Bergen, Norway
|Correspondence: Correspondence: Kine Gregersen, P. Box 2029, Nordnes, 5817 Bergen, Norway, Tel +47 41451159, Fax +47 55905299, Email firstname.lastname@example.org
Food hypersensitivity is commonly reported, but often remains unexplained, despite extensive medical examinations. Patients with such subjective food hypersensitivity attribute a number of somatic health complaints to the ingestion of specific foods, most often cow’s milk, wheat products, egg, fruits, and vegetables.2 The abdominal symptoms are typically consistent with irritable bowel syndrome.2 Psychological disturbances are often associated,3 but do not seem to be major predictors of either gastrointestinal or extraintestinal symptom severity.4 Hence, the etiology of subjective food hypersensitivity remains obscure.
Alterations of the gastrointestinal enterochromaffin cell population has been described in patients with functional gastrointestinal disorders,5,6 and are conceivably implicated in the pathogenesis of subjective food hypersensitivity. In a preliminary study, we recently observed low serum levels of chromogranin A (CgA) in patients with subjective food hypersensitivity.7 CgA is stored and secreted together with amines and peptides from the diffuse neuroendocrine system, and serve as a precursor for several peptides with regulatory functions.8 Enterochromaffin cells are a major source for circulating CgA. In addition, enterochromaffin cells secrete 5-hydroxytryptamine (5-HT, serotonin), a signaling molecule regulating several gut functions, including secretion, motility, and sensitivity. Indeed, most of the body’s 5-HT is contained within enterochromaffin cells. High systemic levels of 5-HT may cause symptoms resembling hypersensitivity reactions to food, such as diarrhea,9,10 nausea,11 or flushing and heart palpitations.12
5-HT is commonly measured in platelets or in plasma, the latter being a poor matrix due to rapid degradation of 5-HT into 5-hydroxyindolacetic acid. More than 95% of plasma 5-HT is present in platelets, and studies assessing platelet 5-HT content in patients with irritable bowel syndrome are somewhat conflicting.13–15 Alterations of 5-HT secretion within the gut are not necessarily reflected in the systemic circulation, and assessing 5-HT in gut tissue samples is often considered to be more accurate. However, the surface of the gastrointestinal tract is very large, and biopsies can only give information from a small fragment of this huge area. Indeed, enterochromaffin cell counts seem to vary a lot in different studies.16,17 Our group has developed a method for analyzing “whole gut 5-HT”, by analyzing gut lavage fluid.18 Enterochromaffin cells release 5-HT mainly from granules at the basal border, but studies have shown that enterochromaffin cells are bipolar and are able to secrete 5-HT both basally, into the systemic circulation, and apically, into the gut lumen.19–21 Our method quantifies luminal enterochromaffin cell secretion along the entire length of the small and large bowel.
The aim of the present study was to explore whether patients with subjective food hypersensitivity display abnormal enterochromaffin cell functions. To evaluate this, we extended our preliminary observations7 and employed our recently developed liquid chromatography tandem mass spectrometry (LCMS) method for determination of 5-HT in gut lavage fluid.18
This study included 69 consecutive patients with subjective food hypersensitivity and abdominal complaints (55 females and 14 males, mean age 39 years, range 21–83 years). The patients went through an extensive medical examination, including detailed medical history-taking, physical examination, and routine laboratory tests, in addition to skin-prick tests, measurements of total and food-specific IgE levels in serum, and double-blind, placebo-controlled food challenge. Gastroenterological investigations included a gastroscopy with gastric and duodenal biopsy-taking to exclude Helicobacter pylori infection and celiac disease. Intestinal permeability was assessed as previously described,22 and levels of calprotectin in gut lavage fluid samples were analyzed to exclude inflammatory bowel disease.23 Patients with organic gastrointestinal diseases, IgE-mediated food allergies, and pregnant or lactating women were not included. A screening questionnaire based on the Rome II criteria24 was applied in all patients for the diagnosis of irritable bowel syndrome.
Twenty-seven patients admitted to the Section of Gastroenterology at Haukeland University Hospital because of suspected inflammatory bowel disease were included as a “patient control group” (11 females and 16 males, mean age 35 years, range 21–65 years). A control group consisting of 35 healthy volunteers (24 females and 11 males, mean age 33 years, range 23–61 years) was also included. The participants in this group were mainly employees of National Institute of Nutrition and Seafood Research or Haukeland University Hospital and students at the University of Bergen. Pregnant or lactating women were not included. The study was performed in accordance with the Declaration of Helsinki and was approved by the Regional Committee for Medical Research Ethics.
The procedure was performed in the morning and all the participants were fasting from midnight. The method of intestinal lavage has been described previously.22 Briefly, 2 L of isotonic polyethylene glycol solution (MW 3350, Laxabon®, Tika, Sweden) was administered through a nasoduodenal feeding tube over a period of 40 minutes, using a peristaltic pump (505S/RL; Watson Marlow, Falmouth, UK). Approximately 50 μCi of 51Cr-labeled ethylenediaminetetra-acetic acid (51CrEDTA, Amersham, Little Chalfont, UK), was added to the solution to allow estimation of intestinal permeability.22 A slightly increased intestinal permeability has been reported previously in patients with subjective food hypersensitivity25 and this parameter was not included as a part of the present report. About one hour after the start of the polyethylene glycol infusion, the solution reached the distal colon and bowel movements started. The first clear fluid passed per rectum was collected and filtered through gauze, and a 4 mL aliquot was collected on tubes containing 0.5 mL of a solution with antiseptic and antiproteolytic activity prepared by adding 1 mL of 10% sodium azide (NaN3) to 50 mL of soybean trypsin inhibitor (Sigma, Taufkirchen, Germany). The samples were stored at −80°C until analysis.
5-HT was analyzed by LCMS as described previously.18 Briefly, a sample of gut lavage fluid was thawed at room temperature and centrifuged. The supernatant was collected and filtered using a hydrophilic nylon membrane syringe filter, 4 mm diameter and 0.45 μm pore size (Chromacol Ltd, Trumbull, CT). Aliquots of 50 μL of the filtered supernatants were transferred into tubes containing internal standard, which was evaporated to dryness in advance. The tubes were vortex-mixed for 1 minute, transferred to an autosampler vial and submitted to LCMS/MS analysis. The internal standard 5-methoxytryptamine (5-CH3O-HT) was purchased from Sigma.
The LCMS system used in this study was an Agilent 1100 series LC/MSD trap, SL model with an electrospray interface, a quaternary pump, degasser, autosampler, thermostated column compartment, variable wavelength ultraviolet light detector, and 25 μL injection volume. The column was a Zorbax Eclipse-C8 RP 150 × 4.6 mm, 5 μm (Agilent Technologies, Palo Alto, CA). The solvent system operated in gradient mode at 0.2 mL/min and consisted of water with formic acid 0.1% v/v and acetonitrile, and ultraviolet detection at 254 nm. Complete system control, data acquisition and processing were done using the ChemStation for LC/MSD version 4.2 from Agilent. The transitions monitored were 177 → 160 m/z for 5-HT and 191 → 174 m/z for 5-CH3O-HT.
Fasting venous blood samples were collected at 8.30 am using gel vials with no added anticoagulants. The patients were fasting for 10 hours. Serum CgA was measured by enzyme-linked immunosorbent assay following the manufacturer’s instructions (ALPCO Diagnostics, Salem, NH).
Data were analyzed and displayed using the GraphPad Prism statistical software package (v 5.00 for Windows; GraphPad Software, San Diego, CA). Log-transformed serotonin levels were evaluated by analysis of variance, whereas CgA levels were evaluated by using unpaired t-tests. All tests were two-tailed; P values of less than 5% were considered statistically significant.
Organic gastrointestinal diseases were not demonstrated in any of the patients with subjective food hypersensitivity. Sixty-four (95%) of the 69 included patients with subjective food hypersensitivity had irritable bowel syndrome according to Rome II criteria, and all completed the lavage procedure. Blood samples for CgA analysis were obtained from 32 of the patients. All of the 27 control patients with suspected inflammatory bowel disease completed the lavage procedure. However, blood samples were not obtained from this group. Based on the medical examination, including endoscopy and histological assessment of mucosal biopsies, 23 of 27 was diagnosed with inflammatory bowel disease, 19 had Crohn’s disease, and four had ulcerative colitis. The remaining patients (n = 4) were excluded from the study. Thirty-five healthy volunteers were included, and blood samples for CgA analysis were obtained from all of them. Twenty of the 35 controls agreed to participate in the lavage procedure.
Serum CgA samples from two of the 32 patients with subjective food hypersensitivity and one of the 35 healthy controls were excluded due to use of proton pump inhibitors, which elevate CgA in blood. Serum levels of CgA were significantly lower in patients with subjective food hypersensitivity compared with healthy controls (P = 0.04, Figure 1).
No significant differences in 5-HT levels were demonstrated between patients with subjective food hypersensitivity and the control groups. No differences in 5-HT levels were found between the two control groups either. In the patient group and the healthy volunteer group, two of 69 samples and three of 20 samples, respectively, were nondetectable. The 5-HT analysis revealed a high degree of variance within all three groups. There was a trend towards a higher level of 5-HT in the inflammatory bowel disease group, albeit not statistically significant (Figure 2). There was no correlation between serum CgA levels and whole gut lavage 5-HT levels, neither in patients (r = 0.00005, not statistically significant) nor in controls (r = 0.08, P = not statistically significant, Figure 3).
Most intestinal enterochromaffin cells are of the “open” type with apical cytoplasmic extensions which project into the gut lumen and short microvilli,26 where they sense and respond to the luminal contents by releasing regulatory compounds like 5-HT and CgA, both into the circulation and in the intestinal lumen. Hyperplasia of enterochromaffin cells together with an increase in 5-HT containing granules has been reported in several studies of both functional disorders and inflammatory diseases of the gut,14,27,28 and 5-HT is supposed to be involved in the pathogenesis of various gastrointestinal disorders.29–31 However, in the present study, gut lavage 5-HT were found to be normal in patients with subjective food hypersensitivity. Patients with inflammatory bowel disease had slightly higher mean levels of 5-HT, but the difference was not significant. The high degree of variance in the 5-HT data may be due to high individual differences, as well as a consequence of the preanalytical sampling procedure. The use of gut lavage fluid for analytical purposes is unique. Based on our previous experience with the procedure,22,23 the first clear fluid was chosen because it was desirable to have as few particles as possible to avoid analytical problems, but we acknowledge that the time point of sampling was not necessarily the same for each participant.
Wang et al demonstrated an interesting immunoendocrine axis in the gut, where 5-HT production in enterochromaffin cells increases in response to secretory products from CD4+ T cells.32 Production and secretion of 5-HT from enterochromaffin cells may thus depend on the immunological profile of the immune response,33 and there is also evidence that mucosal 5-HT modulates the immune response via serotonergic receptors expressed by immune cells.34 Indeed, identification of multiple 5-HT receptor subtypes in the gut, especially 5-HT3 and 5-HT4 receptors, suggests multifaceted actions of 5-HT, and have led to the development of several therapeutic agents for functional gastrointestinal disorders.35
Serum CgA was significantly lower in the patients with subjective food hypersensitivity compared with the healthy controls, which is consistent with our previous results.7 Sidhu et al have reported abnormally elevated levels of serum CgA in a small proportion of their patients with diarrhea-predominant irritable bowel syndrome.36 However, they included no healthy controls, and in many of the patients with elevated CgA, the levels declined with time, which the authors explain as short-lived enterochromaffin cell hyperplasia, as previously reported by Dunlop et al.6 Thus, it would be of interest to perform serial measurements of CgA during a day, and also for several continuous days, in future studies to verify possible fluctuations in circulating CgA levels.
Although CgA is a major enteroendocrine secretion product, little is known about its potential role in gastrointestinal pathophysiology. CgA serves as a prohormone for shorter peptide fragments with regulatory properties.8 Fragments of CgA exert antimicrobial effects and may modulate gastrointestinal motility, sensitivity, and barrier function.37,38 The low levels of CgA demonstrated in the present study could be a consequence of alterations in the gut microbial flora in patients with subjective food hypersensitivity.39,40 Intriguingly, Dlugoz et al have recently demonstrated Chlamydia trachomatis antigens in enteroendocrine cells and macrophages of the small bowel in patients with irritable bowel syndrome.41 Although the clinical significance is yet unknown, this is an exciting finding that, together with the present finding of low serum levels of CgA, could imply impairment of enterochromaffin cell function in patients with subjective food hypersensitivity and irritable bowel syndrome. El-Salhy et al recently demonstrated decreased CgA-positive cells in biopsies from patients with irritable bowel syndrome.42 Thus, a decrease in numbers of CgA secretory cells could be an explanation for the low serum CgA found in the present study.
We conclude that measurements of systemic CgA reveal significantly lower levels in patients with subjective food hypersensitivity than in healthy controls, whereas “whole gut 5-HT” levels seem to be normal. Impaired secretion of CgA may play a role in functional gastrointestinal disorders, and warrants further investigation.
The authors report no conflicts of interest in this work.
KG, JV, KL, and GAL have research grants from the Western Norway Regional Health Authority and the University of Bergen. The authors are indebted to the patients for their participation.
|1.||Lind R,Arslan G,Eriksen HR,et al. A Subjective health complaints and modern health worries in patients with subjective food hypersensitivityDig Dis SciYear: 2005501245125116047467|
|2.||Arslan G,Lind R,Olafsson S,Florvaag,Berstad A. Quality of life in patients with subjective food hypersensitivity: applicability of the 10-item short form of the Nepean Dyspepsia IndexDig Dis SciYear: 20044968068715185878|
|3.||Lillestøl K,Berstad A,Lind R,Florvaag E,Lied GA,Tangen T. Anxiety and depression in patients with self-reported food hypersensitivityGen Hosp PsychiatryYear: 201032424820114127|
|4.||Lind R,Lied GA,Lillestøl K,Valeur J,Berstad A. Do psychological factors predict symptom severity in patients with subjective food hypersensitivity?Scand J GastroenterolYear: 20104583584320433401|
|5.||Li X,Chen H,Lu H,et al. The study on the role of inflammatory cells and mediators in post-infectious functional dyspepsiaScand J GastroenterolYear: 20104557358120163288|
|6.||Dunlop SP,Jenkins D,Neal K,Spiller R. Relative importance of enterochromaffin cell hyperplasia, anxiety, and depression in postinfectious IBSGastroenterologyYear: 20031251651165914724817|
|7.||Valeur J,Milde AM,Helle KB,Berstad A. Low serum chromogranin A in patients with self-reported food hypersensitivityScand J GastroenterolYear: 2008431403140418654936|
|8.||Helle KB. Chromogranins A and B and secretogranin II as prohormones for regulatory peptides from the diffuse neuroendocrine systemResults Probl Cell DifferYear: 201050214420217490|
|9.||Lundgren O. 5-Hydroxytryptamine, enterotoxins, and intestinal fluid secretionGastroenterologyYear: 1998115100910129786724|
|10.||Turvill JL,Connor P,Farthing MJ. The inhibition of cholera toxin-induced 5-HT release by the 5-HT(3) receptor antagonist, granisetron, in the ratBr J PharmacolYear: 20001301031103610882387|
|11.||Sanger GJ. New antiemetic drugsCan J Physiol PharmacolYear: 1990683143242178755|
|12.||McCormick D. Carcinoid tumors and syndromeGastroenterol NursYear: 20022510511112055378|
|13.||Atkinson W,Lockhart S,Whorwell PJ,Keevil B,Houghton LA. Altered 5-hydroxytryptamine signaling in patients with constipation- and diarrhea-predominant irritable bowel syndromeGastroenterologyYear: 2006130344316401466|
|14.||Dunlop SP,Coleman NS,Blackshaw E,et al. Abnormalities of 5-hydroxytryptamine metabolism in irritable bowel syndromeClin Gastroenterol HepatolYear: 2005334935715822040|
|15.||Houghton LA,Atkinson W,Whitaker RP,Whorwell PJ,Rimmer MJ. Increased platelet depleted plasma 5-hydroxytryptamine concentration following meal ingestion in symptomatic female subjects with diarrhoea predominant irritable bowel syndromeGutYear: 20035266367012692050|
|16.||Wheatcroft J,Wakelin D,Smith A,Mahoney CR,Mawe G,Spiller R. Enterochromaffin cell hyperplasia and decreased serotonin transporter in a mouse model of postinfectious bowel dysfunctionNeurogastroenetrol MotilYear: 200517863870|
|17.||Wang SH,Dong L,Luo JY,et al. Decreased expression of serotonin in the jejunum and increased numbers of mast cells in the terminal ileum in patients with irritable bowel syndromeWorld J GastroenterolYear: 2007136041604718023097|
|18.||Gregersen K,Frøyland L,Berstad A,Araujo P. Direct determination of serotonin in gut lavage fluid by liquid chromatographic ion trap tandem mass spectrometryTalantaYear: 20087546647218371908|
|19.||Nilsson O,Ahlman H,Geffard M,Dahlström A,Ericson LE. Bipolarity of duodenal enterochromaffin cells in the ratCell Tissue ResYear: 198724849543552241|
|20.||Ahlman H,Bhargava HN,Dahlström A,Larsson I,Newson B,Pettersson G. On the presence of serotonin in the gut lumen and possible release mechanismsActa Physiol ScandYear: 19811122632696974954|
|21.||Forsberg EJ,Miller RJ. Cholinergic agonists induce vectorial release of serotonin from duodenal enterochromaffin cellsScienceYear: 19822173553567089569|
|22.||Berstad A,Arslan G,Folvik G. Relationship between intestinal permeability and calprotectin concentration in gut lavage fluidScand J GastroenterolYear: 20001646910672837|
|23.||Arslan G,Kahrs GE,Lind R,Frøyland L,Florvaag E,Berstad A. Patients with subjective food hypersensitivity: the value of analyzing intestinal permeability and inflammation markers in gut lavage fluidDigestionYear: 200470263515297775|
|24.||Thompson WG,Longstreth GF,Drossman DA,Heaton KW,Irvine EJ,Muller-Lissner SA. Functional bowel disorders and functional abdominal painGutYear: 199945II43II4710457044|
|25.||Lillestøl K,Helgeland LI,Lied AG,et al. Indications of ‘atopic bowel’ in patients with self-reported food hypersensitivityAliment Pharmacol TherYear: 2010311112112220163379|
|26.||Gustafsson BI,Bakke I,Tømmerås K,Waldum HL. A new method for visualization of gut mucosal cells, describing the enterochromaffin cell in the rat gastrointestinal tractScand J GastroenterolYear: 20064139039516635905|
|27.||Gershon MD. The serotonin signaling system: from basic understanding to drug development for functional GI disordersGastroenterologyYear: 200713239741417241888|
|28.||Kim HS,Lim JH,Park H,Lee SI. Increased immunoendocrine cells in intestinal mucosa of postinfectious irritable bowel syndrome patients 3 years after acute Shigella infection – an observation in a small case control studyYonsei Med JYear: 201051455120046513|
|29.||Coates MD,Mahoney CR,Linden DR,et al. Molecular defects in mucosal serotonin content and decreased serotonin reuptake transporter in ulcerative colitis and irritable bowel syndromeGastroenterologyYear: 20041261657166415188158|
|30.||Bishop AE,Pietroletti R,Taat CW,Brummelkamp WH,Polak JM. Increased populations of endocrine cells in Crohn’s ileitisVirchows Arch A Pathol Anat HistopatholYear: 19874103913963103321|
|31.||El-Salhy M,Danielsson A,Stenling R,Grimelius L. Colonic endocrine cells in inflammatory bowel diseaseJ Intern MedYear: 19972424134199408072|
|32.||Wang H,Steeds J,Motomura Y,et al. CD4+ T cell-mediated immunological control of enterochromaffin cell hyperplasia and 5-hydroxytryptamine production in enteric infectionGutYear: 20075694995717303597|
|33.||Motomura Y,Ghia JE,Wang H,et al. Enterochromaffin cell and 5-hydroxytryptamine responses to the same infectious agent differ in Th1 and Th2 dominant environmentsGutYear: 20085747548118198200|
|34.||Cloëz-Tayarani I,Changeux JP. Nicotine and serotonin in immune regulation and inflammatory processes: a perspectiveJ Leukoc BiolYear: 20078159960617108054|
|35.||Ladabaum U. Safety, efficacy and costs of pharmacotherapy for functional gastrointestinal disorders: the case of alosetron and its implicationsAliment Pharmacol TherYear: 2003171021103012694084|
|36.||Sidhu R,McAlindon ME,Leeds JS,Skilling J,Sanders DS. The role of serum chromogranin a in diarrhoea predominant irritable bowel syndromeJ Gastrointestin Liver DisYear: 200918232619337629|
|37.||Shooshtarizadeh P,Zhang D,Chich JF,et al. The antimicrobial peptides derived from chromogranin/secretogranin family, new actors of innate immunityRegul PeptYear: 201016510211019932135|
|38.||Khan WI,Ghia JE. Gut hormones: emerging role in immune activation and inflammationClin Exp ImmunolYear: 2010161192720408856|
|39.||Uribe A,Alam M,Johansson O,Midtvedt T,Theodorsson E. Microflora modulates endocrine cells in the gastrointestinal mucosa of the ratGastroenterologyYear: 1994107125912697926490|
|40.||Valeur J,Morken MH,Norin E,Midtvedt T,Berstad A. Intestinal fermentation in patients with self-reported food hypersensitivity: painful, but protective?Clin Exp GastroenterolYear: 20103657021694848|
|41.||Dlugosz A,Törnblom H,Mohammadian G,et al. Chlamydia trachomatis antigens in enteroendocrine cells and macrophages of the small bowel in patients with severe irritable bowel syndromeBMJ GastroenterolYear: 20101019|
|42.||El-Salhy M,Lomholt-Beck B,Hausken T. Chromogranin A as a possible tool in the diagnosis of irritable bowel syndromeScand J GastroenterolYear: 2010451435143920602602|
Keywords: food hypersensitivity, chromogranin A, serotonin, gut lavage fluid, liquid chromatography.
Previous Document: Hypotensive response after water-walking and land-walking exercise sessions in healthy trained and u...
Next Document: Diurnal salivary cortisol concentrations in Parkinson's disease: increased total secretion and morni...