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Camilleri M, Jencks K. Pharmacogenetics in IBS: update and impact of GWAS studies in drug targets and metabolism. Expert Opin Drug Metab Toxicol 2024; 20:319-332. [PMID: 38785066 PMCID: PMC11139426 DOI: 10.1080/17425255.2024.2349716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 04/26/2024] [Indexed: 05/25/2024]
Abstract
INTRODUCTION Medications are frequently prescribed for patients with irritable bowel syndrome (IBS) or disorders of gut brain interaction. The level of drug metabolism and modifications in drug targets determine medication efficacy to modify motor or sensory function as well as patient response outcomes. AREAS COVERED The literature search included PubMed searches with the terms: pharmacokinetics, pharmacogenomics, epigenetics, clinical trials, irritable bowel syndrome, disorders of gut brain interaction, and genome-wide association studies. The main topics covered in relation to irritable bowel syndrome were precision medicine, pharmacogenomics related to drug metabolism, pharmacogenomics related to mechanistic targets, and epigenetics. EXPERT OPINION Pharmacogenomics impacting drug metabolism [CYP 2D6 (cytochrome P450 2D6) or 2C19 (cytochrome P450 2C19)] is the most practical approach to precision medicine in the treatment of IBS. Although there are proof of concept studies that have documented the importance of genetic modification of transmitters or receptors in altering responses to medications in IBS, these principles have rarely been applied in patient response outcomes. Genome-wide association (GWAS) studies have now documented the association of symptoms with genetic variation but not the evaluation of treatment responses. Considerably more research, particularly focused on patient response outcomes and epigenetics, is essential to impact this field in clinical medicine.
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Affiliation(s)
- Michael Camilleri
- Clinical Enteric Neuroscience Translational and Epidemiological Research (CENTER), Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Kara Jencks
- Clinical Enteric Neuroscience Translational and Epidemiological Research (CENTER), Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
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2
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Szentirmai E, Buckley K, Massie AR, Kapas L. Lipopolysaccharide-Mediated Effects of the Microbiota on Sleep and Body Temperature. RESEARCH SQUARE 2024:rs.3.rs-3995260. [PMID: 38496422 PMCID: PMC10942547 DOI: 10.21203/rs.3.rs-3995260/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Background Recent research suggests that microbial molecules translocated from the intestinal lumen into the host's internal environment may play a role in various physiological functions, including sleep. Previously, we identified that butyrate, a short-chain fatty acid, produced by intestinal bacteria, and lipoteichoic acid, a cell wall component of gram-positive bacteria induce sleep when their naturally occurring translocation is mimicked by direct delivery into the portal vein. Building upon these findings, we aimed to explore the sleep signaling potential of intraportally administered lipopolysaccharide, a primary component of gram-negative bacterial cell walls, in rats. Results Low dose of lipopolysaccharide (1 μg/kg) increased sleep duration and prolonged fever, without affecting systemic lipopolysaccharide levels. Interestingly, administering LPS systemically outside the portal region at a dose 20 times higher did not affect sleep, indicating a localized sensitivity within the hepatoportal region, encompassing the portal vein and liver, for the sleep and febrile effects of lipopolysaccharide. Furthermore, both the sleep- and fever-inducing effects of LPS were inhibited by indomethacin, a prostaglandin synthesis inhibitor, and replicated by intraportal administration of prostaglandin E2 or arachidonic acid, suggesting the involvement of the prostaglandin system in mediating these actions. Conclusions These findings underscore the dynamic influence of lipopolysaccharide in the hepatoportal region on sleep and fever mechanisms, contributing to a complex microbial molecular assembly that orchestrates communication between the intestinal microbiota and brain. Lipopolysaccharide is a physiological component of plasma in both the portal and extra-portal circulation, with its levels rising in response to everyday challenges like high-fat meals, moderate alcohol intake, sleep loss and psychological stress. The increased translocation of lipopolysaccharide under such conditions may account for their physiological impact in daily life, highlighting the intricate interplay between microbial molecules and host physiology.
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Mayorga EJ, Horst EA, Goetz BM, Rodriguez-Jimenez S, Abeyta MA, Al-Qaisi M, Rhoads RP, Selsby JT, Baumgard LH. Therapeutic effects of mitoquinol during an acute heat stress challenge in growing barrows. J Anim Sci 2024; 102:skae161. [PMID: 38860702 PMCID: PMC11208932 DOI: 10.1093/jas/skae161] [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: 01/23/2024] [Accepted: 06/10/2024] [Indexed: 06/12/2024] Open
Abstract
Study objectives were to determine the effects of mitoquinol (MitoQ, a mitochondrial-targeted antioxidant) on biomarkers of metabolism and inflammation during acute heat stress (HS). Crossbred barrows [n = 32; 59.0 ± 5.6 kg body weight (BW)] were blocked by BW and randomly assigned to 1 of 4 environmental-therapeutic treatments: 1) thermoneutral (TN) control (n = 8; TNCon), 2) TN and MitoQ (n = 8; TNMitoQ), 3) HS control (n = 8; HSCon), or 4) HS and MitoQ (n = 8; HSMitoQ). Pigs were acclimated for 6 d to individual pens before study initiation. The trial consisted of two experimental periods (P). During P1 (2 d), pigs were fed ad libitum and housed in TN conditions (20.6 ± 0.8 °C). During P2 (24 h), HSCon and HSMitoQ pigs were exposed to continuous HS (35.2 ± 0.2 °C), while TNCon and TNMitoQ remained in TN conditions. MitoQ (40 mg/d) was orally administered twice daily (0700 and 1800 hours) during P1 and P2. Pigs exposed to HS had increased rectal temperature, skin temperature, and respiration rate (+1.5 °C, +6.8 °C, and +101 breaths per minute, respectively; P < 0.01) compared to their TN counterparts. Acute HS markedly decreased feed intake (FI; 67%; P < 0.01); however, FI tended to be increased in HSMitoQ relative to HSCon pigs (1.5 kg vs. 0.9 kg, respectively; P = 0.08). Heat-stressed pigs lost BW compared to their TN counterparts (-4.7 kg vs. +1.6 kg, respectively; P < 0.01); however, the reduction in BW was attenuated in HSMitoQ compared to HSCon pigs (-3.9 kg vs. -5.5 kg, respectively; P < 0.01). Total gastrointestinal tract weight (empty tissue and luminal contents) was decreased in HS pigs relative to their TN counterparts (6.2 kg vs. 8.6 kg, respectively; P < 0.01). Blood glucose increased in HSMitoQ relative to HSCon pigs (15%; P = 0.04). Circulating non-esterified fatty acids (NEFA) increased in HS compared to TN pigs (P < 0.01), although this difference was disproportionately influenced by elevated NEFA in HSCon relative to HSMitoQ pigs (251 μEq/L vs. 142 μEq/L; P < 0.01). Heat-stressed pigs had decreased circulating insulin relative to their TN counterparts (47%; P = 0.04); however, the insulin:FI ratio tended to increase in HS relative to TN pigs (P = 0.09). Overall, circulating leukocytes were similar across treatments (P > 0.10). Plasma C-reactive protein remained similar among treatments; however, haptoglobin increased in HS relative to TN pigs (48%; P = 0.03). In conclusion, acute HS exposure negatively altered animal performance, inflammation, and metabolism, which were partially ameliorated by MitoQ.
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Affiliation(s)
- Edith J Mayorga
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Erin A Horst
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Brady M Goetz
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | | | - Megan A Abeyta
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Mohmmad Al-Qaisi
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Robert P Rhoads
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - Joshua T Selsby
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Lance H Baumgard
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
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4
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Hanning N, Verboven R, De Man JG, Ceuleers H, De Schepper HU, Smet A, De Winter BY. Single-day and multi-day exposure to orogastric gavages does not affect intestinal barrier function in mice. Am J Physiol Gastrointest Liver Physiol 2023; 324:G281-G294. [PMID: 36749571 DOI: 10.1152/ajpgi.00203.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 01/26/2023] [Accepted: 01/29/2023] [Indexed: 02/08/2023]
Abstract
Animals involved in common laboratory procedures experience minor levels of stress. The direct effect of limited amounts of stress on gastrointestinal function has not been reported yet. Therefore, this study aimed to assess the effect of single-day and multi-day orogastric gavages on gut physiology in mice. To this end, 12-wk-old female C57Bl6/J mice were randomized to receive treatment with sterile water (200 µL) delivered by orogastric gavages twice daily for a total of 1 or 10 day(s). Control animals did not receive any treatment. Subsequently, gastrointestinal function was assessed by measuring fecal pellet production. Furthermore, ex vivo intestinal barrier and secretory function of the distal colon, proximal colon, and terminal ileum were quantified in Ussing chambers. In mice, single-day gavages did neither influence corticosterone levels nor gastrointestinal function. In mice exposed to multi-day gavages, corticosterone levels were slightly but significantly increased compared with controls after 10 days of treatment. Gastrointestinal motor function was altered, as evidenced by increased fecal pellet counts and a small increase in fecal water content. However, exposure to repeated gavages did not lead to detectable alterations in gastrointestinal barrier function as quantified by the paracellular flux of the probe 4 kDa FITC-dextran as well as transepithelial resistance measurements. Thus, the administration of drugs via single-day or multi-day orogastric gavages leads to no or minor stress in mice, respectively. In both cases, it does not hamper the study of the intestinal barrier function and therefore remains a valuable administration route in preclinical pharmacological research.NEW & NOTEWORTHY Exposure of mice to serial orogastric gavages over the course of 10 days leads to a small but significant increase in plasma corticosterone levels, indicating the presence of a limited amount of stress that is absent after a single-day treatment. This minor stress after multi-day gavages results in increased fecal pellet production and fecal water content in exposed compared with nontreated mice but does not affect the intestinal barrier function in the distal colon, proximal colon, or terminal ileum.
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Affiliation(s)
- Nikita Hanning
- Laboratory of Experimental Medicine and Pediatrics and Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
| | - Rosanne Verboven
- Laboratory of Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
| | - Joris G De Man
- Laboratory of Experimental Medicine and Pediatrics and Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
| | - Hannah Ceuleers
- Laboratory of Experimental Medicine and Pediatrics and Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
| | - Heiko U De Schepper
- Laboratory of Experimental Medicine and Pediatrics and Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Department of Gastroenterology and Hepatology, Antwerp University Hospital, Edegem, Belgium
| | - Annemieke Smet
- Laboratory of Experimental Medicine and Pediatrics and Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
| | - Benedicte Y De Winter
- Laboratory of Experimental Medicine and Pediatrics and Infla-Med Centre of Excellence, University of Antwerp, Antwerp, Belgium
- Department of Gastroenterology and Hepatology, Antwerp University Hospital, Edegem, Belgium
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Babic NL, Johnstone CP, Reljić S, Sergiel A, Huber Đ, Reina RD. Evaluation of physiological stress in free-ranging bears: current knowledge and future directions. Biol Rev Camb Philos Soc 2023; 98:168-190. [PMID: 36176191 PMCID: PMC10086944 DOI: 10.1111/brv.12902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 08/25/2022] [Accepted: 08/31/2022] [Indexed: 01/12/2023]
Abstract
Stress responses, which are mediated by the neurogenic system (NS) and hypothalamic-pituitary-adrenal (HPA) axis help vertebrates maintain physiological homeostasis. Fight-or-flight responses are activated by the NS, which releases norepinephrine/noradrenaline and epinephrine/adrenaline in response to immediate stressors, whilst the HPA axis releases glucocorticoid hormones (e.g. cortisol and corticosterone) to help mitigate allostatic load. There have been many studies on stress responses of captive animals, but they are not truly reflective of typical ranges or the types of stressors encountered by free-ranging wildlife, such as responses and adaptation to environmental change, which are particularly important from a conservation perspective. As stress can influence the composition of age and sex classes of free-ranging populations both directly and indirectly, ecological research must be prioritised towards more vulnerable taxa. Generally, large predators tend to be particularly at risk of anthropogenically driven population declines because they exhibit reduced behavioural plasticity required to adapt to changing landscapes and exist in reduced geographic ranges, have small population sizes, low fecundity rates, large spatial requirements and occupy high trophic positions. As a keystone species with a long history of coexistence with humans in highly anthropogenic landscapes, there has been growing concern about how humans influence bear behaviour and physiology, via numerous short- and long-term stressors. In this review, we synthesise research on the stress response in free-ranging bear populations and evaluate the effectiveness and limitations of current methodology in measuring stress in bears to identify the most effective metrics for future research. Particularly, we integrate research that utilised haematological variables, cardiac monitors and Global Positioning System (GPS) collars, serum/plasma and faecal glucocorticoid concentrations, hair cortisol levels, and morphological metrics (primarily skulls) to investigate the stress response in ursids in both short- and long-term contexts. We found that in free-ranging bears, food availability and consumption have the greatest influence on individual stress, with mixed responses to anthropogenic influences. Effects of sex and age on stress are also mixed, likely attributable to inconsistent methods. We recommend that methodology across all stress indicators used in free-ranging bears should be standardised to improve interpretation of results and that a wider range of species should be incorporated in future studies.
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Affiliation(s)
- Natarsha L Babic
- School of Biological Sciences, Monash University, 25 Rainforest Walk, Clayton, 3800, Victoria, Australia
| | - Christopher P Johnstone
- School of Biological Sciences, Monash University, 25 Rainforest Walk, Clayton, 3800, Victoria, Australia
| | - Slaven Reljić
- Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, Zagreb, 10000, Croatia
| | - Agnieszka Sergiel
- Institute of Nature Conservation, Polish Academy of Sciences, Adama Mickiewicza 33, Krakow, 31120, Poland
| | - Đuro Huber
- Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, Zagreb, 10000, Croatia.,Institute of Nature Conservation, Polish Academy of Sciences, Adama Mickiewicza 33, Krakow, 31120, Poland
| | - Richard D Reina
- School of Biological Sciences, Monash University, 25 Rainforest Walk, Clayton, 3800, Victoria, Australia
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Lobo B, Tramullas M, Finger BC, Lomasney KW, Beltran C, Clarke G, Santos J, Hyland NP, Dinan TG, Cryan JF. The Stressed Gut: Region-specific Immune and Neuroplasticity Changes in Response to Chronic Psychosocial Stress. J Neurogastroenterol Motil 2023; 29:72-84. [PMID: 36606438 PMCID: PMC9837549 DOI: 10.5056/jnm22009] [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: 01/24/2022] [Revised: 05/05/2022] [Accepted: 06/03/2022] [Indexed: 01/07/2023] Open
Abstract
Background/Aims Chronic psychological stress affects gastrointestinal physiology which may underpin alterations in the immune response and epithelial transport, both functions are partly regulated by enteric nervous system. However, its effects on enteric neuroplasticity are still unclear. This study aims to investigate the effects of chronic unpredictable psychological stress on intestinal motility and prominent markers of enteric function. Methods Adult male C57BL/6J mice were exposed to 19 day of unpredictable stress protocol schedule of social defeat and overcrowding. We investigated the effects on plasma corticosterone, food intake, and body weight. In vivo gastrointestinal motility was assessed by fecal pellet output and by whole-gastrointestinal transit (using the carmine red method). Tissue monoamine level, neural and glial markers, neurotrophic factors, monoamine signaling, and Toll-like receptor expression in the proximal and distal colon, and terminal ileum were also assessed. Results Following chronic unpredictable psychological stress, stressed mice showed increased food intake and body weight gain (P < 0.001), and reduced corticosterone levels (P < 0.05) compared to control mice. Stressed mice had reduced stool output without differences in water content, and showed a delayed gastrointestinal transit compared to control mice (P < 0.05). Stressed mice exhibited decreased mRNA expression of tyrosine hydroxylase (Th), brain-derived neurotrophic factor (Bdnf) and glial cell-derived neurotrophic factor (Gdnf), as well as Toll-like receptor 2 (Tlr2) compared to control (P < 0.05), only proximal colon. These molecular changes in proximal colon were associated with higher levels of monoamines in tissue. Conclusion Unpredictable psychological chronic stress induces region-specific impairment in monoamine levels and neuroplasticity markers that may relate to delayed intestinal transit.
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Affiliation(s)
- Beatriz Lobo
- APC Microbiome Ireland, University College Cork, Ireland,Digestive System Research Unit, Laboratory of Neuro-Immuno-Gastroenterology, Vall d’Hebron Institut de Recerca (VHIR), Vall d’Hebron Hospital Universitari, Barcelona, Spain,Department of Gastroenterology, Vall d’Hebron Hospital Universitari, Passeig Vall d’Hebron Barcelona, Spain,Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain,Correspondence: Beatriz Lobo, PhD, MD, Laboratory of Neuro-Immuno-Gastroenterology, Digestive Diseases Research Unit. Vall d’Hebron Institut de Recerca (VHIR), Vall d’Hebron Hospital Universitari, Vall d’Hebron Barcelona Hospital Campus, Passeig Vall d’Hebron 119-129, 08035 Barcelona, Spain, Tel: +34-93-489-4035, E-mail:
| | - Mónica Tramullas
- APC Microbiome Ireland, University College Cork, Ireland,Departamento de Fisiología y Farmacología, Facultad de Medicina, Universidad de Cantabria, Santander, Spain (Current address)
| | - Beate-C Finger
- APC Microbiome Ireland, University College Cork, Ireland
| | - Kevin W Lomasney
- APC Microbiome Ireland, University College Cork, Ireland,Departments of Anatomy and Neuroscience, University College Cork, Ireland
| | - Caroll Beltran
- APC Microbiome Ireland, University College Cork, Ireland,Laboratory of Immunogastroenterology, Gastroenterology Unit, Hospital Clinico Universidad de Chile, Faculty of Medicine Universidad de Chile, Santiago, Chile
| | - Gerard Clarke
- APC Microbiome Ireland, University College Cork, Ireland
| | - Javier Santos
- Digestive System Research Unit, Laboratory of Neuro-Immuno-Gastroenterology, Vall d’Hebron Institut de Recerca (VHIR), Vall d’Hebron Hospital Universitari, Barcelona, Spain,Department of Gastroenterology, Vall d’Hebron Hospital Universitari, Passeig Vall d’Hebron Barcelona, Spain,Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Instituto de Salud Carlos III, Madrid, Spain
| | - Niall P Hyland
- APC Microbiome Ireland, University College Cork, Ireland,Departments of Physiology, University College Cork, Ireland
| | - Timothy G Dinan
- APC Microbiome Ireland, University College Cork, Ireland,Departments of Psychiatry and Neurobehavioural Science, University College Cork, Ireland
| | - John F Cryan
- APC Microbiome Ireland, University College Cork, Ireland,Departments of Anatomy and Neuroscience, University College Cork, Ireland,John F Cryan, PhD, Department of Anatomy and Neuroscience, University College Cork, room 3.86 Western Gateway Building, Ireland, Fax: +353-0214205497, E-mail:
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Acute Stress Regulates Sex-Related Molecular Responses in the Human Jejunal Mucosa: Implications for Irritable Bowel Syndrome. Cells 2023; 12:cells12030423. [PMID: 36766765 PMCID: PMC9913488 DOI: 10.3390/cells12030423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/17/2023] [Accepted: 01/23/2023] [Indexed: 02/03/2023] Open
Abstract
Irritable bowel syndrome (IBS) is a prevalent gastrointestinal disorder linked to intestinal barrier dysfunction and life stress. We have previously reported that female sex per se determines an increased susceptibility to intestinal barrier dysfunction after cold pain stress (CPS). We aimed to identify sex-related molecular differences in response to CPS in healthy subjects to understand the origin of sex bias predominance in IBS. In 13 healthy males and 21 females, two consecutive jejunal biopsies were obtained using Watson's capsule, at baseline, and ninety minutes after CPS. Total mucosal RNA and protein were isolated from jejunal biopsies. Expression of genes related to epithelial barrier (CLDN1, CLDN2, OCLN, ZO-1, and ZO-3), mast cell (MC) activation (TPSAB1, SERPINA1), and the glucocorticoid receptor (NR3C1) were analyzed using RT-qPCR. NR3C1, ZO-1 and OCLN protein expression were evaluated through immunohistochemistry and western blot, and mucosal inflammation through MC, lymphocyte, and eosinophil numbering. Autonomic, hormonal, and psychological responses to CPS were monitored. We found an increase in jejunal MCs, a reduced CLDN1 and OCLN expression, and an increased CLDN2 and SERPINA1 expression 90 min after CPS. We also found a significant decrease in ZO-1, OCLN, and NR3C1 gene expression, and a decrease in OCLN protein expression only in females, when compared to males. CPS induced a significant increase in blood pressure, plasma cortisol and ACTH, and subjective stress perception in all participants. Specific and independent sex-related molecular responses in epithelial barrier regulation are unraveled by acute stress in the jejunum of healthy subjects and may partially explain female predominance in IBS.
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8
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Hasler WL, Grabauskas G, Singh P, Owyang C. Mast cell mediation of visceral sensation and permeability in irritable bowel syndrome. Neurogastroenterol Motil 2022; 34:e14339. [PMID: 35315179 PMCID: PMC9286860 DOI: 10.1111/nmo.14339] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 11/09/2021] [Accepted: 12/03/2021] [Indexed: 12/13/2022]
Abstract
Abnormalities of mast cell structure or function may play prominent roles in irritable bowel syndrome (IBS) symptom genesis. Mast cells show close apposition to sensory nerves and release bioactive substances in response to varied stimuli including infection, stress, and other neuroendocrine factors. Most studies focus on patients who develop IBS after enteric infection or who report diarrhea-predominant symptoms. Three topics underlying IBS pathogenesis have been emphasized in recent investigations. Visceral hypersensitivity to luminal stimulation is found in most IBS patients and may contribute to abdominal pain. Mast cell dysfunction also may disrupt epithelial barrier function which alters mucosal permeability potentially leading to altered bowel function and pain. Mast cell products including histamine, proteases, prostaglandins, and cytokines may participate in hypersensitivity and permeability defects, especially with diarrhea-predominant IBS. Recent experimental evidence indicates that the pronociceptive effects of histamine and proteases are mediated by the generation of prostaglandins in the mast cell. Enteric microbiome interactions including increased mucosal bacterial translocation may activate mast cells to elicit inflammatory responses underlying some of these pathogenic effects. Therapies to alter mast cell activity (mast cell stabilizers) or function (histamine antagonists) have shown modest benefits in IBS. Future investigations will seek to define patient subsets with greater potential to respond to therapies that address visceral hypersensitivity, epithelial permeability defects, and microbiome alterations secondary to mast cell dysfunction in IBS.
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Affiliation(s)
- William L. Hasler
- Division of Gastroenterology and HepatologyUniversity of Michigan Health SystemAnn ArborMichiganUSA
| | - Gintautas Grabauskas
- Division of Gastroenterology and HepatologyUniversity of Michigan Health SystemAnn ArborMichiganUSA
| | - Prashant Singh
- Division of Gastroenterology and HepatologyUniversity of Michigan Health SystemAnn ArborMichiganUSA
| | - Chung Owyang
- Division of Gastroenterology and HepatologyUniversity of Michigan Health SystemAnn ArborMichiganUSA
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Wiley JW, Higgins GA, Hong S. Chronic psychological stress alters gene expression in rat colon epithelial cells promoting chromatin remodeling, barrier dysfunction and inflammation. PeerJ 2022; 10:e13287. [PMID: 35509963 PMCID: PMC9059753 DOI: 10.7717/peerj.13287] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 03/28/2022] [Indexed: 01/25/2023] Open
Abstract
Chronic stress is commonly associated with enhanced abdominal pain (visceral hypersensitivity), but the cellular mechanisms underlying how chronic stress induces visceral hypersensitivity are poorly understood. In this study, we examined changes in gene expression in colon epithelial cells from a rat model using RNA-sequencing to examine stress-induced changes to the transcriptome. Following chronic stress, the most significantly up-regulated genes included Atg16l1, Coq10b, Dcaf13, Nat2, Ptbp2, Rras2, Spink4 and down-regulated genes including Abat, Cited2, Cnnm2, Dab2ip, Plekhm1, Scd2, and Tab2. The primary altered biological processes revealed by network enrichment analysis were inflammation/immune response, tissue morphogenesis and development, and nucleosome/chromatin assembly. The most significantly down-regulated process was the digestive system development/function, whereas the most significantly up-regulated processes were inflammatory response, organismal injury, and chromatin remodeling mediated by H3K9 methylation. Furthermore, a subpopulation of stressed rats demonstrated very significantly altered gene expression and transcript isoforms, enriched for the differential expression of genes involved in the inflammatory response, including upregulation of cytokine and chemokine receptor gene expression coupled with downregulation of epithelial adherens and tight junction mRNAs. In summary, these findings support that chronic stress is associated with increased levels of cytokines and chemokines, their downstream signaling pathways coupled to dysregulation of intestinal cell development and function. Epigenetic regulation of chromatin remodeling likely plays a prominent role in this process. Results also suggest that super enhancers play a primary role in chronic stress-associated intestinal barrier dysfunction.
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Affiliation(s)
- John W. Wiley
- Department of Internal Medicine, University of Michigan - Ann Arbor, Ann Arbor, MI, United States of America
| | - Gerald A. Higgins
- Department of Computational Medicine and Bioinformatics, University of Michigan - Ann Arbor, Ann Arbor, MI, United States of America
| | - Shuangsong Hong
- Department of Internal Medicine, University of Michigan - Ann Arbor, Ann Arbor, MI, United States of America
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10
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Rodrigues V, Rao MS, Rao GS, Rao K G M. Neuroprotective potential of ocimum sanctum (Linn) leaf extract in preventing and attenuating stress induced substantia nigral neuronal damage in rats. J Ayurveda Integr Med 2022; 13:100651. [PMID: 36370484 PMCID: PMC9647530 DOI: 10.1016/j.jaim.2022.100651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 09/29/2022] [Accepted: 10/03/2022] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND In Ayurveda; an Indian system of traditional medicine, Ocimum sanctum is said to have remedial effect on hriddaurbalya (problems affecting the mind), aakshepayukta vikara (nervous disorders) and shiroroga (diseases of head). Hence, in Ayurvedic practice, it is profoundly used as an antistress medicine. Stress is known to affect neurons of functionally significant brain regions like substantia nigra. However, experimental evidence showing its effect on morphology of substantia nigral neurons is lacking. In addition, whether the O. sanctum treatment attenuates stress induced substantia nigral neuronal structural changes is not known. OBJECTIVES To know the effect of stress on morphology of substantia nigral neurons and the effect of O. sanctum fresh leaf extract (OSE) on substantia nigral neurons of stressed rats. MATERIAL AND METHODS Present study included three experiments. Experiment I: To study the effect of 3 and 6 weeks of foot shock stress in rats; Experiment II- To study the effect of 3 weeks of OSE treatment on 3 week-stress undergoing rats and on 3 week-stressed rats; Experiment III- To study the effect of 6 weeks of OSE treatment in 6 week-stress undergoing rats and in 6 week-stressed rats. RESULTS In experiment I, stress had significant deleterious effect on dendritic arborization of substantia nigral neurons. Experiments II and III showed prevention and attenuation of the stress induced dendritic atrophy of substantia nigral neurons in both 2 ml and 4 ml OSE treatment groups. Protective effect of OSE was more pronounced in rats which are treated for a longer duration. CONCLUSIONS Foot shock stress induces neuronal damage in the substantia nigra of rats. Treatment with fresh leaf extract of O. sanctum could prevent and attenuate the foot shock stress induced behavioral deficit and substantia nigral neuronal damage.
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Affiliation(s)
- Vincent Rodrigues
- Department of Preclinical Sciences, Faculty of Medical Sciences, University of the West Indies, St. Augustine, Trinidad and Tobago
| | - Muddanna S Rao
- Department of Anatomy, Faculty of Medicine, Kuwait University, Safat, Kuwait
| | - Gurumadhva S Rao
- Department of Pharmacology, RAK Medical and Health Sciences University, Ras Al Khaimah, United Arab Emirates
| | - Mohandas Rao K G
- Department of Anatomy, Melaka Manipal Medical College, Manipal Academy of Higher Education, Manipal, India.
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11
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Ergün P, Capanoglu D, Kipcak S, Bor S. Response of Esophageal Epithelium to Acute and Chronic Stress in Rabbits. Bull Exp Biol Med 2021; 171:582-587. [PMID: 34617182 DOI: 10.1007/s10517-021-05273-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Indexed: 12/17/2022]
Abstract
We studied electrophysiological changes in rabbit esophageal epithelium following acute (AS) and chronic stress (CS). Esophageal tissue was placed in Ussing chamber and the potential difference U between the luminal and abluminal sides, the short-circuit current Isc, as well as the tissue resistance R were measured. The initial values of these parameters for each sample were determined after the samples were stabilized in Ringer solution. Then, the tissues were exposed for 1 h to normal Ringer solution or Ringer solution with pH 4.0 and pH 1.7 with or without pepsin (0.25 mg/ml). Fluorescein was added to the luminal side of the sample to measure its permeability. In the AS group, U at Ringer solution (pH 1.7)+pepsin was significantly decreased in comparison with the baseline and control values (by 46 and 22%, respectively, p<0.05). R decreased by 74% in comparison with baseline, which little differed from the decrease in control samples exposed to Ringer solution (pH 1.7)+pepsin (by 62%). CS did not change U relative to baseline values, while changes in R were similar to those in the AS group. In the AS group, the permeability of the esophageal tissue perfused with Ringer solution (pH 1.7)+pepsin was significantly higher than in both the control and CS groups. AS, but not CS, made the esophageal epithelium more sensitive to the effects of noxious agents, disrupted barrier properties, and increased permeability. The effects of stress on gastroesophageal reflux disease symptoms can be related to severe exposure to acid and/or pepsin; however, the mechanisms other than epithelial defense should be evaluated.
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Affiliation(s)
- P Ergün
- Ege Reflux Study Group, Division of Gastroenterology, Izmir, Turkey.,Department of Medical Biochemistry, Izmir, Turkey
| | - D Capanoglu
- Ege Reflux Study Group, Division of Gastroenterology, Izmir, Turkey
| | - S Kipcak
- Ege Reflux Study Group, Division of Gastroenterology, Izmir, Turkey.,Department of Medical Biology, Faculty of Medicine, Ege University, Izmir, Turkey
| | - S Bor
- Ege Reflux Study Group, Division of Gastroenterology, Izmir, Turkey.
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12
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Mayorga EJ, Kvidera SK, Horst EA, Al-Qaisi M, McCarthy CS, Abeyta MA, Lei S, Elsasser TH, Kahl S, Kiros TG, Baumgard LH. Effects of dietary live yeast supplementation on growth performance and biomarkers of metabolism and inflammation in heat-stressed and nutrient-restricted pigs. Transl Anim Sci 2021; 5:txab072. [PMID: 34189415 PMCID: PMC8223600 DOI: 10.1093/tas/txab072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 04/20/2021] [Indexed: 01/20/2023] Open
Abstract
Study objectives were to determine the effects of dietary live yeast (Saccharomyces cerevisiae strain CNCM I-4407; ActisafHR+; 0.25g/kg of feed; Phileo by Lesaffre, Milwaukee, WI) on growth performance and biomarkers of metabolism and inflammation in heat-stressed and nutrient-restricted pigs. Crossbred barrows (n = 96; 79 ± 1 kg body weight [BW]) were blocked by initial BW and randomly assigned to one of six dietary-environmental treatments: 1) thermoneutral (TN) and fed ad libitum the control diet (TNCon), 2) TN and fed ad libitum a yeast containing diet (TNYeast), 3) TN and pair-fed (PF) the control diet (PFCon), 4) TN and PF the yeast containing diet (PFYeast), 5) heat stress (HS) and fed ad libitum the control diet (HSCon), or 6) HS and fed ad libitum the yeast diet (HSYeast). Following 5 d of acclimation to individual pens, pigs were enrolled in two experimental periods (P). During P1 (7 d), pigs were housed in TN conditions (20 °C) and fed their respective dietary treatments ad libitum. During P2 (28 d), HSCon and HSYeast pigs were fed ad libitum and exposed to progressive cyclical HS (28–33 °C) while TN and PF pigs remained in TN conditions and were fed ad libitum or PF to their HSCon and HSYeast counterparts. Pigs exposed to HS had an overall increase in rectal temperature, skin temperature, and respiration rate compared to TN pigs (0.3 °C, 5.5 °C, and 23 breaths per minute, respectively; P < 0.01). During P2, average daily feed intake (ADFI) decreased in HS compared to TN pigs (30%; P < 0.01). Average daily gain and final BW decreased in HS relative to TN pigs (P < 0.01); however, no differences in feed efficiency (G:F) were observed between HS and TN treatments (P > 0.16). A tendency for decreased ADFI and increased G:F was observed in TNYeast relative to TNCon pigs (P < 0.10). Circulating insulin was similar between HS and TN pigs (P > 0.42). Triiodothyronine and thyroxine levels decreased in HS compared to TN treatments (~19% and 20%, respectively; P < 0.05). Plasma tumor necrosis factor-alpha (TNF-α) did not differ across treatments (P > 0.57) but tended to decrease in HSYeast relative to HSCon pigs (P = 0.09). In summary, dietary live yeast did not affect body temperature indices or growth performance and had minimal effects on biomarkers of metabolism; however, it tended to improve G:F under TN conditions and tended to reduce the proinflammatory mediator TNF-α during HS. Further research on the potential role of dietary live yeast in pigs during HS or nutrient restriction scenarios is warranted.
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Affiliation(s)
- Edith J Mayorga
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Sara K Kvidera
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Erin A Horst
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Mohmmad Al-Qaisi
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Carrie S McCarthy
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Megan A Abeyta
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Samantha Lei
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Theodore H Elsasser
- U.S. Department of Agriculture, Animal Biosciences and Biotechnology Laboratory, Beltsville, MD 20705, USA
| | - Stanislaw Kahl
- U.S. Department of Agriculture, Animal Biosciences and Biotechnology Laboratory, Beltsville, MD 20705, USA
| | | | - Lance H Baumgard
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
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13
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The effectiveness of continuous and interval exercise preconditioning against chronic unpredictable stress: Involvement of hippocampal PGC-1α/FNDC5/BDNF pathway. J Psychiatr Res 2021; 136:173-183. [PMID: 33607579 DOI: 10.1016/j.jpsychires.2021.02.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 01/13/2021] [Accepted: 02/08/2021] [Indexed: 11/24/2022]
Abstract
Various exercise-training types are known to prevent depression, but mechanisms underlying their beneficial effects remain unknown. In the present study, the preconditioning effect of continuous and interval exercise on stress-induced depression was evaluated. Adult male Wistar rats in the exercise groups were made to run on a motorized treadmill, five sessions per week for six weeks. After that, to induce the depression model, the rats were exposed to chronic unpredictable stress for three weeks. Behavioral tests were assessed by open field, elevated plus maze, and forced swim tests. Hippocampal PGC-1α, FNDC5, and BDNF protein expression by Western blot and serum corticosterone by ELISA were detected. In the present results, after continuous and interval exercise periods, locomotor activity, the number of entries and time spent in the open arms were increased, and immobility time was significantly reduced. PGC-1α, FNDC5, and BDNF protein levels had a significant increase, and serum corticosterone did not change. Also, interval exercise training increased PGC-1α and FNDC5 more than continuous. Chronic unpredictable stress reduced the positive changes caused by exercise training, although, except FNDC5, exercise preconditioned groups experienced less significant adverse changes in most variables. These findings showed that both continuous and interval exercise preconditioning with increasing hippocampal PGC-1α, FNDC5, and BDNF proteins and improve the anxiety- and depression-like behaviors have a protective effect against chronic unpredictable stress.
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14
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Liu S, Karo A, Agterberg S, Hua H, Bhargava A. Effects of stress-related peptides on chloride secretion in the mouse proximal colon. Neurogastroenterol Motil 2021; 33:e14021. [PMID: 33118282 DOI: 10.1111/nmo.14021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 09/22/2020] [Accepted: 10/01/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND Stress increases intestinal secretion and exacerbates symptoms of irritable bowel syndrome (IBS). Peripherally derived corticotropin-releasing factor (CRF) is known to mediate stress-induced intestinal secretion, presumably by activation of CRF1 receptors in the gut. The present study aimed to ascertain the role of CRF2 activation in intestinal secretion by three other members of CRF peptide family, urocortin (UCN) 1-3, in wild type (WT) and CRF2 knockout (Crhr2-/- ) mice. METHODS Mucosal/submucosal preparations from proximal colon of WT and Crhr2-/- mice of both sexes were mounted in Ussing chambers for measurement of short-circuit current (Isc ) as an indicator of ion secretion. KEY RESULTS Male mice demonstrated a significantly higher baseline Isc than female in both WT and Crhr2-/- genotypes. CRF and UCN1-3 (1 μM) caused greater increases in colonic Isc (ΔIsc ) in male than female. Colonic Isc response to the selective CRF1 agonist, stressin1, was similar in both sexes. In male mice, the selective CRF2 agonists (UCN2 and UCN3) caused significantly greater ΔIsc than CRF and stressin1. UCN2- and UCN3-evoked ΔISC was significantly reduced in preparations pretreated with the selective CRF2 antagonist antisauvagine-30 and in Crhr2-/- mice. The prosecretory effects of urocortins were due to increases in Cl- secretion and involved enteric neurons and mast cells. CONCLUSIONS AND INFERENCE The findings revealed sex differences in baseline colonic secretion and responses to stress-related peptides. CRF2 receptors play a more prominent role in colonic secretion in male mice. The greater baseline secretion and responses to UCNs may contribute to the higher prevalence of diarrhea-predominant IBS in males.
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Affiliation(s)
- Sumei Liu
- Department of Biology, College of Science and Health, University of Wisconsin-La Crosse, La Crosse, WI, USA
| | - Aaron Karo
- Department of Biology, College of Science and Health, University of Wisconsin-La Crosse, La Crosse, WI, USA
| | - Sita Agterberg
- Department of Biology, College of Science and Health, University of Wisconsin-La Crosse, La Crosse, WI, USA
| | - Howard Hua
- Department of Biology, College of Science and Health, University of Wisconsin-La Crosse, La Crosse, WI, USA
| | - Aditi Bhargava
- Department of OBGYN, Center for Reproductive Sciences, University of California San Francisco, San Francisco, CA, USA
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15
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Yamani A, Wu D, Ahrens R, Waggoner L, Noah TK, Garcia-Hernandez V, Ptaschinski C, Parkos CA, Lukacs NW, Nusrat A, Hogan SP. Dysregulation of intestinal epithelial CFTR-dependent Cl - ion transport and paracellular barrier function drives gastrointestinal symptoms of food-induced anaphylaxis in mice. Mucosal Immunol 2021; 14:135-143. [PMID: 32576925 PMCID: PMC11197992 DOI: 10.1038/s41385-020-0306-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 04/20/2020] [Accepted: 05/01/2020] [Indexed: 02/04/2023]
Abstract
Food-triggered anaphylaxis can encompass a variety of systemic and intestinal symptoms. Murine-based and clinical studies have revealed a role for histamine and H1R and H2R-pathway in the systemic response; however, the molecular processes that regulate the gastrointestinal (GI) response are not as well defined. In the present study, by utilizing an IgE-mast cell (MC)-dependent experimental model of oral antigen-induced anaphylaxis, we define the intestinal epithelial response during a food-induced anaphylactic reaction. We show that oral allergen-challenge stimulates a rapid dysregulation of intestinal epithelial transcellular and paracellular transport that was associated with the development of secretory diarrhea. Allergen-challenge induced (1) a rapid intestinal epithelial Cftr-dependent Cl- secretory response and (2) paracellular macromolecular leak that was associated with modification in epithelial intercellular junction proteins claudin-1, 2, 3 and 5, E-cadherin and desmosomal cadherins. OVA-induced Cftr-dependent Cl- secretion and junctional protein degradation was rapid occurring and was sustained for 72 h following allergen-challenge. Blockade of both the proteolytic activity and Cl- secretory response was required to alleviate intestinal symptoms of food-induced anaphylaxis. Collectively, these data suggest that the GI symptom of food-induced anaphylactic reaction, secretory diarrhea, is a consequence of CFTR-dependent Cl- secretion and proteolytic activity.
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Affiliation(s)
- Amnah Yamani
- Mary H Weiser Food Allergy Center, Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Ave, Cincinnati, OH, 45229-3026, USA
| | - David Wu
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Ave, Cincinnati, OH, 45229-3026, USA
| | - Richard Ahrens
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Ave, Cincinnati, OH, 45229-3026, USA
| | - Lisa Waggoner
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Ave, Cincinnati, OH, 45229-3026, USA
| | - Taeko K Noah
- Mary H Weiser Food Allergy Center, Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Ave, Cincinnati, OH, 45229-3026, USA
| | - Vicky Garcia-Hernandez
- Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
| | - Catherine Ptaschinski
- Mary H Weiser Food Allergy Center, Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
| | - Charles A Parkos
- Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
| | - Nicholas W Lukacs
- Mary H Weiser Food Allergy Center, Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
- Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
| | - Asma Nusrat
- Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
| | - Simon P Hogan
- Mary H Weiser Food Allergy Center, Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA.
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Ave, Cincinnati, OH, 45229-3026, USA.
- Department of Pathology, Michigan Medicine, University of Michigan, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA.
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16
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Guo S, Yang C, Jiang S, Ni Y, Zhao R, Ma W. Repeated Restraint Stress Enhances Hepatic TFR2 Expression and Induces Hepatic Iron Accumulation in Rats. Biol Trace Elem Res 2020; 196:590-596. [PMID: 31707638 DOI: 10.1007/s12011-019-01956-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 10/24/2019] [Indexed: 12/26/2022]
Abstract
Abnormal hepatic iron metabolism is detrimental to health. The objective of this study was to detect repeated restraint stress on liver iron metabolism in rats. Twenty-four male rats aged 7 weeks were randomly divided into 2 groups: control group (Con) and repeated restraint stress group (RS). Rats were subjected to 6 h of daily restraint stress for 14 consecutive days in the repeated restraint stress group. The results showed that repeated restraint stress exposure decreased growth performance including impaired final weight (P = 0.07), reducing average daily gain (P = 0.01), and average daily feed intake (P = 0.00) during the 14-day experimental period. Repeated restraint stress exposure did not affect hemoglobin content and plasma iron parameters except downregulated unsaturated iron-binding capacity (P = 0.04). Repeated restraint stress exposure inhibited liver development (P = 0.03) and induced liver iron accumulation (P = 0.05). In addition, repeated restraint stress downregulated the expression of transferrin (TF) and transferrin receptor 2 (TFR2) at the mRNA level (P < 0.01), but upregulated at the protein level (P = 0.03 for TF; P = 0.00 for TFR2). These results indicated that repeated restraint stress induces hepatic iron accumulation, which is closely related to higher expression of hepatic TFR2 protein in rats.
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Affiliation(s)
- Shihui Guo
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, 210095, Jiangsu, People's Republic of China
- MOE Joint International Research Laboratory of Animal Health & Food Safety, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Chun Yang
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, 210095, Jiangsu, People's Republic of China
- MOE Joint International Research Laboratory of Animal Health & Food Safety, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Shuxia Jiang
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, 210095, Jiangsu, People's Republic of China
- MOE Joint International Research Laboratory of Animal Health & Food Safety, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Yingdong Ni
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, 210095, Jiangsu, People's Republic of China
- MOE Joint International Research Laboratory of Animal Health & Food Safety, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Ruqian Zhao
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, 210095, Jiangsu, People's Republic of China
- MOE Joint International Research Laboratory of Animal Health & Food Safety, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Wenqiang Ma
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing, 210095, Jiangsu, People's Republic of China.
- MOE Joint International Research Laboratory of Animal Health & Food Safety, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China.
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17
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Mayorga EJ, Ross JW, Keating AF, Rhoads RP, Baumgard LH. Biology of heat stress; the nexus between intestinal hyperpermeability and swine reproduction. Theriogenology 2020; 154:73-83. [PMID: 32531658 DOI: 10.1016/j.theriogenology.2020.05.023] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 05/15/2020] [Accepted: 05/17/2020] [Indexed: 02/06/2023]
Abstract
Unfavorable weather conditions are one of the largest constraints to maximizing farm animal productivity. Heat stress (HS), in particular, compromises almost every metric of profitability and this is especially apparent in the grow-finish and reproductive aspects of the swine industry. Suboptimal production during HS was traditionally thought to result from hypophagia. However, independent of inadequate nutrient consumption, HS affects a plethora of endocrine, physiological, metabolic, circulatory, and immunological variables. Whether these changes are homeorhetic strategies to survive the heat load or are pathological remains unclear, nor is it understood if they temporally occur by coincidence or if they are chronologically causal. However, mounting evidence suggest that the origin of the aforementioned changes lie at the gastrointestinal tract. Heat stress compromises intestinal barrier integrity, and increased appearance of luminal contents in circulation causes local and systemic inflammatory responses. The resulting immune activation is seemingly the epicenter to many, if not most of the negative consequences HS has on reproduction, growth, and lactation. Interestingly, thermoregulatory and production responses to HS are only marginally related. In other words, increased body temperature indices poorly predict decreases in productivity. Further, HS induced malnutrition is also a surprisingly inaccurate predictor of productivity. Thus, selecting animals with a "heat tolerant" phenotype based solely or separately on thermoregulatory capacity or production may not ultimately increase resilience. Describing the physiology and mechanisms that underpin how HS jeopardizes animal performance is critical for developing approaches to ameliorate current production issues and requisite for generating future strategies (genetic, managerial, nutritional, and pharmaceutical) aimed at optimizing animal well-being, and improving the sustainable production of high-quality protein for human consumption.
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Affiliation(s)
- E J Mayorga
- Department of Animal Science, Iowa State University, Ames, IA, 50011, USA
| | - J W Ross
- Department of Animal Science, Iowa State University, Ames, IA, 50011, USA
| | - A F Keating
- Department of Animal Science, Iowa State University, Ames, IA, 50011, USA
| | - R P Rhoads
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - L H Baumgard
- Department of Animal Science, Iowa State University, Ames, IA, 50011, USA.
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18
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Itomi Y, Tanaka T, Matsushita K, Kawamura T, Kojima T, Aso K, Matsumoto-Okano S, Tsukimi Y. Pharmacological evaluation of a novel corticotropin-releasing factor 1 receptor antagonist T-3047928 in stress-induced animal models in a comparison with alosetron. Neurogastroenterol Motil 2020; 32:e13795. [PMID: 31970891 DOI: 10.1111/nmo.13795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/19/2019] [Accepted: 12/13/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND The major symptoms of irritable bowel syndrome (IBS) are changes in bowel habits and abdominal pain. Psychological stress is the major pathophysiological components of IBS. Corticotropin-releasing factor (CRF) is a well-known integrator in response to psychological stress. In this study, a novel CRF1 receptor antagonist T-3047928 was evaluated in stress-induced IBS models of rats to explore its potency for IBS. METHODS Plasma adrenocorticotropic hormone (ACTH) levels after intravenous oCRH challenge were measured as a pharmacodynamic marker. Efficacies of oral T-3047928 were compared with oral alosetron, a 5-HT3 antagonist, on conditioning fear stress (CFS)-induced defecation, restraint stress (RS)-induced acute visceral pain, specific alteration of rhythm in temperature (SART) stress-induced chronic visceral pain, and normal defecation. RESULTS T-3047928 (1-10 mg/kg, p.o.) demonstrated a dose-dependent inhibition on oCRH-induced ACTH secretion. In disease models, T-3047928 suppressed fecal pellet output induced by CFS and improved both acute and chronic visceral hypersensitivity induced by RS and SART stress, respectively. Alosetron was also efficacious in stress-induced defecation and visceral pain models at 1 and 10 mg/kg, respectively. Alosetron, however, also suppressed normal defecation at lower those. On the other hand, T-3047928 did not change normal defecation even at higher dose than those in disease models. CONCLUSION T-3047928 is an orally active CRF1 antagonist that demonstrated potent inhibitory effects in stress-associated IBS models with no effect on normal defecation. Therefore, it is suggested that T-3047928 may have a potency as a novel option for IBS-D therapy with minimal constipation risk.
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Affiliation(s)
- Yasuo Itomi
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Takahiro Tanaka
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Kozo Matsushita
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Toru Kawamura
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Takuto Kojima
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Kazuyoshi Aso
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Shiho Matsumoto-Okano
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Yasuhiro Tsukimi
- Inflammation DDU, Pharmacological Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
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19
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Mahurkar-Joshi S, Chang L. Epigenetic Mechanisms in Irritable Bowel Syndrome. Front Psychiatry 2020; 11:805. [PMID: 32922317 PMCID: PMC7456856 DOI: 10.3389/fpsyt.2020.00805] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 07/27/2020] [Indexed: 12/12/2022] Open
Abstract
Irritable bowel syndrome (IBS) is a brain-gut axis disorder characterized by abdominal pain and altered bowel habits. IBS is a multifactorial, stress-sensitive disorder with evidence for familial clustering attributed to genetic or shared environmental factors. However, there are weak genetic associations reported with IBS and a lack of evidence to suggest that major genetic factor(s) contribute to IBS pathophysiology. Studies on animal models of stress, including early life stress, suggest a role for environmental factors, specifically, stress associated with dysregulation of corticotropin releasing factor and hypothalamus-pituitary-adrenal (HPA) axis pathways in the pathophysiology of IBS. Recent evidence suggests that epigenetic mechanisms, which constitute molecular changes not driven by a change in gene sequence, can mediate environmental effects on central and peripheral function. Epigenetic alterations including DNA methylation changes, histone modifications, and differential expression of non-coding RNAs (microRNA [miRNA] and long non-coding RNA) have been associated with several diseases. The objective of this review is to elucidate the molecular factors in the pathophysiology of IBS with an emphasis on epigenetic mechanisms. Emerging evidence for epigenetic changes in IBS includes changes in DNA methylation in animal models of IBS and patients with IBS, and various miRNAs that have been associated with IBS and endophenotypes, such as increased visceral sensitivity and intestinal permeability. DNA methylation, in particular, is an emerging field in the realm of complex diseases and a promising mechanism which can provide important insights into IBS pathogenesis and identify potential targets for treatment.
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Affiliation(s)
- Swapna Mahurkar-Joshi
- G. Oppenheimer Center for Neurobiology of Stress and Resilience, Division of Digestive Diseases, Department of Medicine at UCLA, Los Angeles, CA, United States
| | - Lin Chang
- G. Oppenheimer Center for Neurobiology of Stress and Resilience, Division of Digestive Diseases, Department of Medicine at UCLA, Los Angeles, CA, United States
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20
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Noah TK, Knoop KA, McDonald KG, Gustafsson JK, Waggoner L, Vanoni S, Batie M, Arora K, Naren AP, Wang YH, Lukacs NW, Munitz A, Helmrath MA, Mahe MM, Newberry RD, Hogan SP. IL-13-induced intestinal secretory epithelial cell antigen passages are required for IgE-mediated food-induced anaphylaxis. J Allergy Clin Immunol 2019; 144:1058-1073.e3. [PMID: 31175877 PMCID: PMC6779525 DOI: 10.1016/j.jaci.2019.04.030] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 03/15/2019] [Accepted: 04/29/2019] [Indexed: 01/10/2023]
Abstract
BACKGROUND Food-induced anaphylaxis (FIA) is an IgE-dependent immune response that can affect multiple organs and lead to life-threatening complications. The processes by which food allergens cross the mucosal surface and are delivered to the subepithelial immune compartment to promote the clinical manifestations associated with food-triggered anaphylaxis are largely unexplored. OBJECTIVE We sought to define the processes involved in the translocation of food allergens across the mucosal epithelial surface to the subepithelial immune compartment in FIA. METHODS Two-photon confocal and immunofluorescence microscopy was used to visualize and trace food allergen passage in a murine model of FIA. A human colon cancer cell line, RNA silencing, and pharmacologic approaches were used to identify the molecular regulation of intestinal epithelial allergen uptake and translocation. Human intestinal organoid transplants were used to demonstrate the conservation of these molecular processes in human tissues. RESULTS Food allergens are sampled by using small intestine (SI) epithelial secretory cells (termed secretory antigen passages [SAPs]) that are localized to the SI villous and crypt region. SAPs channel food allergens to lamina propria mucosal mast cells through an IL-13-CD38-cyclic adenosine diphosphate ribose (cADPR)-dependent process. Blockade of IL-13-induced CD38/cADPR-dependent SAP antigen passaging in mice inhibited induction of clinical manifestations of FIA. IL-13-CD38-cADPR-dependent SAP sampling of food allergens was conserved in human intestinal organoids. CONCLUSION We identify that SAPs are a mechanism by which food allergens are channeled across the SI epithelium mediated by the IL-13/CD38/cADPR pathway, regulate the onset of FIA reactions, and are conserved in human intestine.
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Affiliation(s)
- Taeko K Noah
- Mary H. Weiser Food Allergy Center, Department of Pathology, University of Michigan, Ann Arbor, Mich; Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Kathryn A Knoop
- Division of Gastroenterology, Washington University School of Medicine St Louis, St Louis, Mo
| | - Keely G McDonald
- Division of Gastroenterology, Washington University School of Medicine St Louis, St Louis, Mo
| | - Jenny K Gustafsson
- Division of Gastroenterology, Washington University School of Medicine St Louis, St Louis, Mo
| | - Lisa Waggoner
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Simone Vanoni
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Matthew Batie
- Division of Clinical Engineering, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Kavisha Arora
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Anjaparavanda P Naren
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Yui-Hsi Wang
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Nicholas W Lukacs
- Mary H. Weiser Food Allergy Center, Department of Pathology, University of Michigan, Ann Arbor, Mich
| | - Ariel Munitz
- Department of Clinical Microbiology and Immunology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Michael A Helmrath
- Division of Pediatric Surgery, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Maxime M Mahe
- Division of Pediatric Surgery, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Rodney D Newberry
- Division of Gastroenterology, Washington University School of Medicine St Louis, St Louis, Mo
| | - Simon P Hogan
- Mary H. Weiser Food Allergy Center, Department of Pathology, University of Michigan, Ann Arbor, Mich; Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.
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21
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Duff AF, Baxter MFA, Graham BD, Hargis BM, Bielke LR. Mode of Action of Dietary Dexamethasone May Not Be Dependent Upon Microbial Mechanisms in Broilers. Microorganisms 2019; 7:microorganisms7090346. [PMID: 31547289 PMCID: PMC6780751 DOI: 10.3390/microorganisms7090346] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 09/07/2019] [Accepted: 09/09/2019] [Indexed: 12/26/2022] Open
Abstract
Dexamethasone (Dex), a synthetic glucocorticoid (GC), in feed has been shown to increase gut permeability via stress-mediated mechanisms, but the exact mode of action on gut barrier function is not fully understood. Stress has been reported to alter the profile and virulence of intestinal flora predisposing for opportunistic disease. This study aimed to evaluate the relationship between dietary Dex and recoverable intestinal microbial profile in broilers to better understand mode of action and refine future uses of the model. Three experiments were conducted that administered Dex-treated feed for one week in conjunction with the antibiotics BMD (bacitracin methylene disalicylate) or Baytril® (enrofloxacin) to evaluate if enteric microbial mechanisms were important in Dex-induced permeability. Serum fluorescein isothiocyanate-dextran (FITC-d) and bacterial translocation (BT) have been reported to increase after Dex treatment and were used to assess gut epithelial leakage. Shifts in bacterial profiles were also measured on selective agar. Combining Dex with BMD or Baytril resulted in increased (P < 0.05) serum FITC-d versus Dex-only. Additionally, Baytril did not reduce aerobic BT and bacterial profiles remained similar after Dex. These results suggest a minimal role of intestinal microbes in Dex-induced changes to intestinal barrier function.
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Affiliation(s)
- Audrey F Duff
- Department of Animal Sciences The Ohio State University, Columbus, OH 43210, USA.
| | - Mikayla F A Baxter
- Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA.
| | - B Danielle Graham
- Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA.
| | - Billy M Hargis
- Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA.
| | - Lisa R Bielke
- Department of Animal Sciences The Ohio State University, Columbus, OH 43210, USA.
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22
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Zhao T, Hu S, Ma P, Che D, Liu R, Zhang Y, Wang J, Li C, Ding Y, Fu J, An H, Gao Z, Zhang T. Neohesperidin suppresses IgE‐mediated anaphylactic reactions and mast cell activation via Lyn‐PLC‐Ca
2+
pathway. Phytother Res 2019; 33:2034-2043. [PMID: 31197891 DOI: 10.1002/ptr.6385] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 04/03/2019] [Accepted: 04/17/2019] [Indexed: 12/12/2022]
Affiliation(s)
- Tingting Zhao
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Shiling Hu
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Pengyu Ma
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Delu Che
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Rui Liu
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Yongjing Zhang
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Jue Wang
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Chaomei Li
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Yuanyuan Ding
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Jia Fu
- College of PharmacyXi'an Jiaotong University Xi'an China
| | - Hongli An
- Center for Translational MedicineFirst Affiliated Hospital of Xi'an Jiaotong University Xi'an China
| | - Zijun Gao
- Department of AnesthesiologyXi'an Honghui Hospital of Xi'an Jiaotong University Xi'an China
| | - Tao Zhang
- College of PharmacyXi'an Jiaotong University Xi'an China
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Joung JY, Cho JH, Kim YH, Choi SH, Son CG. A literature review for the mechanisms of stress-induced liver injury. Brain Behav 2019; 9:e01235. [PMID: 30761781 PMCID: PMC6422711 DOI: 10.1002/brb3.1235] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/15/2019] [Accepted: 01/18/2019] [Indexed: 02/06/2023] Open
Abstract
INTRODUCTION Experimental studies and clinical observations have shown that stress can damage hepatic tissue both directly and indirectly. Many studies have partially revealed the contributors of stress-induced liver injury; however, the whole process has not yet been uncovered. This review aims to summarize the mechanisms that have been proposed to be involved. METHODS A literature search was conducted using PubMed (http://www.ncbi.nlm.nih.gov/pubmed) in its entirety up to March 2018, and analyzed the animal-derived mechanistic studies on stress-induced liver injury. RESULTS The liver is the organ that meets and filters a mass of alien material, and then maintains immune tolerance under physiological conditions. Under stress conditions, however, immune tolerance is interrupted, which results in the induction of inflammation in the liver. Contributors to this process can be categorized as follows: hypoxia-reoxygenation, over-activation of Kupffer cells and oxidative stress, influx of gut-derived lipopolysaccharide and norepinephrine, and over-production of stress hormones and activation of the sympathetic nerve. CONCLUSIONS Psychological stress is associated with a variety of pathological conditions resulting in liver injury through multiple systems, including the sympathetic nervous and adrenocortical system. Mechanistic understanding of this phenomenon is important for the clinical practice of managing patients with hepatic disorders and should be explored further in the future.
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Affiliation(s)
- Jin-Yong Joung
- Liver and Immunology Research Center, Daejeon Oriental Hospital of Daejeon University, Daejeon, Korea
| | - Jung-Hyo Cho
- Liver and Immunology Research Center, Daejeon Oriental Hospital of Daejeon University, Daejeon, Korea
| | - Yun-Hee Kim
- Korean Medicine Convergence Research Division, Korea Institute of Oriental Medicine (KIOM), Daejeon, Korea
| | - Seung-Hoon Choi
- Department of Life Convergence, Graduate School of Dankook University, Yongin, Korea
| | - Chang-Gue Son
- Liver and Immunology Research Center, Daejeon Oriental Hospital of Daejeon University, Daejeon, Korea
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Calarge CA, Devaraj S, Shulman RJ. Gut permeability and depressive symptom severity in unmedicated adolescents. J Affect Disord 2019; 246:586-594. [PMID: 30605877 DOI: 10.1016/j.jad.2018.12.077] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 11/13/2018] [Accepted: 12/24/2018] [Indexed: 12/14/2022]
Abstract
OBJECTIVE This study examined gut permeability in unmedicated adolescents with and without major depressive disorder. METHOD Medically healthy, non-medicated, 12-17 year-old females in a major depressive episode (MDE) or healthy controls, without any psychiatric condition, were enrolled. They completed the Children's Depression Rating Scale-Revised (CDRS-R) and underwent a clinical interview. Preejection period (PEP) and respiratory sinus arrhythmia (RSA) data were collected to measure autonomic nervous system activity. Following an overnight fast, participants ingested lactulose and mannitol and collected urine for 4 hours while still fasting, to examine gut permeability. Plasma cytokines (interleukin 1β, interleukin 6, and tumor necrosis factor α) were measured. Correlational analyses were used to examine the associations between relevant variables. RESULTS 41 female participants (age: 14.8 ± 1.6 years, n = 25 with MDE) were enrolled. PEP, but not RSA, was inversely associated with neurovegetative symptom severity on the CDRS-R (r = -0.31, p < 0.06). In the 30 participants with gut permeability data, the lactulose to mannitol ratio (LMR) was significantly positively associated with depression severity, particularly neurovegetative symptom severity (r = 0.37, p < 0.05). Notably, the association between neurovegetative symptom severity and PEP was substantially reduced after adjusting for LMR. Additionally, depression severity was significantly associated with circulating cytokines. CONCLUSIONS This is the first study to examine gut permeability in unmedicated adolescents, offering preliminary support for a mechanistic pathway linking sympathetic nervous system activation to increased gut permeability and activation of the innate immune system, likely contributing to the emergence of neurovegetative symptoms of depression.
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Affiliation(s)
- Chadi A Calarge
- Menninger Department of Psychiatry and Behavioral Sciences and Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, 1102 Bates Ave, Suite 790 (C-0790.03) Houston, TX 77030, USA.
| | - Sridevi Devaraj
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
| | - Robert J Shulman
- Department of Pediatrics, Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
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25
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D'Costa S, Ayyadurai S, Gibson AJ, Mackey E, Rajput M, Sommerville LJ, Wilson N, Li Y, Kubat E, Kumar A, Subramanian H, Bhargava A, Moeser AJ. Mast cell corticotropin-releasing factor subtype 2 suppresses mast cell degranulation and limits the severity of anaphylaxis and stress-induced intestinal permeability. J Allergy Clin Immunol 2018; 143:1865-1877.e4. [PMID: 30439403 DOI: 10.1016/j.jaci.2018.08.053] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 08/03/2018] [Accepted: 08/17/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Psychological stress and heightened mast cell (MC) activation are linked with important immunologic disorders, including allergy, anaphylaxis, asthma, and functional bowel diseases, but the mechanisms remain poorly defined. We have previously demonstrated that activation of the corticotropin-releasing factor (CRF) system potentiates MC degranulation responses during IgE-mediated anaphylaxis and psychological stress through corticotropin-releasing factor receptor subtype 1 (CRF1) expressed on MCs. OBJECTIVE In this study we investigated the role of corticotropin-releasing factor receptor subtype 2 (CRF2) as a modulator of stress-induced MC degranulation and associated disease pathophysiology. METHODS In vitro MC degranulation assays were performed with bone marrow-derived mast cells (BMMCs) derived from wild-type (WT) and CRF2-deficient (CRF2-/-) mice and RBL-2H3 MCs transfected with CRF2-overexpressing plasmid or CRF2 small interfering RNA. In vivo MC responses and associated pathophysiology in IgE-mediated passive systemic anaphylaxis and acute psychological restraint stress were measured in WT, CRF2-/-, and MC-deficient KitW-sh/W-sh knock-in mice. RESULTS Compared with WT mice, CRF2-/- mice exhibited greater serum histamine levels and exacerbated IgE-mediated anaphylaxis and colonic permeability. In addition, CRF2-/- mice exhibited increased serum histamine levels and colonic permeability after acute restraint stress. Experiments with BMMCs and RBL-2H3 MCs demonstrated that CRF2 expressed on MCs suppresses store-operated Ca2+ entry signaling and MC degranulation induced by diverse MC stimuli. Experiments with MC-deficient KitW-sh/W-sh mice systemically engrafted with WT and CRF2-/- BMMCs demonstrated the functional importance of MC CRF2 in modulating stress-induced pathophysiology. CONCLUSIONS MC CRF2 is a negative global modulator of stimuli-induced MC degranulation and limits the severity of IgE-mediated anaphylaxis and stress-related disease pathogenesis.
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Affiliation(s)
- Susan D'Costa
- Thurston Arthritis Research Center, University of North Carolina, Chapel Hill, NC
| | - Saravanan Ayyadurai
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, East Lansing, Mich
| | | | - Emily Mackey
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, East Lansing, Mich; Comparative Biomedical Sciences Program, North Carolina State University, Raleigh, NC
| | - Mrigendra Rajput
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, East Lansing, Mich
| | | | - Neco Wilson
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, East Lansing, Mich
| | - Yihang Li
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, East Lansing, Mich
| | - Eric Kubat
- Department of Surgery, East Bay, University of California, San Francisco, Calif
| | - Ananth Kumar
- Department of Physiology, Michigan State University, East Lansing, Mich
| | | | - Aditi Bhargava
- Department of Surgery and Osher Center for Integrative Medicine, University of California, San Francisco, Calif
| | - Adam J Moeser
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, East Lansing, Mich; Department of Physiology, Michigan State University, East Lansing, Mich.
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Creekmore AL, Hong S, Zhu S, Xue J, Wiley JW. Chronic stress-associated visceral hyperalgesia correlates with severity of intestinal barrier dysfunction. Pain 2018; 159:1777-1789. [PMID: 29912860 PMCID: PMC6097612 DOI: 10.1097/j.pain.0000000000001271] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In humans, chronic psychological stress is associated with increased intestinal paracellular permeability and visceral hyperalgesia, which is recapitulated in the chronic intermittent water avoidance stress (WAS) rat model. However, it is unknown whether enhanced visceral pain and permeability are intrinsically linked and correlate. Treatment of rats with lubiprostone during WAS significantly reduced WAS-induced changes in intestinal epithelial paracellular permeability and visceral hyperalgesia in a subpopulation of rats. Lubiprostone also prevented WAS-induced decreases in the epithelial tight junction protein, occludin (Ocln). To address the question of whether the magnitude of visceral pain correlates with the extent of altered intestinal permeability, we measured both end points in the same animal because of well-described individual differences in pain response. Our studies demonstrate that visceral pain and increased colon permeability positively correlate (0.6008, P = 0.0084). Finally, exposure of the distal colon in control animals to Ocln siRNA in vivo revealed that knockdown of Ocln protein inversely correlated with increased paracellular permeability and enhanced visceral pain similar to the levels observed in WAS-responsive rats. These data support that Ocln plays a potentially significant role in the development of stress-induced increased colon permeability. We believe this is the first demonstration that the level of chronic stress-associated visceral hyperalgesia directly correlates with the magnitude of altered colon epithelial paracellular permeability.
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Affiliation(s)
| | | | | | | | - John W. Wiley
- Corresponding Author: John W Wiley, MD, University of Michigan Medical School, 1150 W Medical Center Drive, 9301A MSRB III, Ann Arbor MI 48109-5648, 734-615-6621,
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Wang N, McKell M, Dang A, Yamani A, Waggoner L, Vanoni S, Noah T, Wu D, Kordowski A, Köhl J, Hoebe K, Divanovic S, Hogan SP. Lipopolysaccharide suppresses IgE-mast cell-mediated reactions. Clin Exp Allergy 2017; 47:1574-1585. [PMID: 28833704 PMCID: PMC5865592 DOI: 10.1111/cea.13013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 07/11/2017] [Accepted: 08/02/2017] [Indexed: 12/12/2022]
Abstract
BACKGROUND Clinical and experimental analyses have identified a central role for IgE/FcεRI/mast cells in promoting IgE-mediated anaphylaxis. Recent data from human studies suggest that bacterial infections can alter susceptibility to anaphylaxis. OBJECTIVE We examined the effect of LPS exposure on the induction of IgE-mast cell (MC) mediated reactions in mice. METHODS C57BL/6 WT, tlr4-/- and IL10-/- mice were exposed to LPS, and serum cytokines (TNF and IL-10) were measured. Mice were subsequently treated with anti-IgE, and the symptoms of passive IgE-mediated anaphylaxis, MC activation, Ca2+ -mobilization and the expression of FcεRI on peritoneal MCs were quantitated. RESULTS We show that LPS exposure of C57BL/6 WT mice constraints IgE-MC-mediated reactions. LPS-induced suppression of IgE-MC-mediated responses was TLR-4-dependent and associated with increased systemic IL-10 levels, decreased surface expression of FcεRI on MCs and loss of sensitivity to IgE activation. Notably, LPS-induced desensitization of MCs was short term with MC sensitivity to IgE reconstituted within 48 hours, which was associated with recapitulation of FcεRI expression on the MCs. Mechanistic analyses revealed a requirement for IL-10 in LPS-mediated decrease in MC FcεRI surface expression. CONCLUSIONS & CLINICAL RELEVANCE Collectively, these studies suggest that LPS-induced IL-10 promotes the down-regulation of MC surface FcεRI expression and leads to desensitization of mice to IgE-mediated reactions. These studies indicate that targeting of the LPS-TLR-4-IL-10 pathway may be used as a therapeutic approach to prevent adverse IgE-mediated reactions.
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Affiliation(s)
- Nianrong Wang
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
- Chongqing Health Center for Women and Children, Yuzhong Qu, 400065 Chongqing Shi China
| | - Melanie McKell
- Immunobiology, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Andrew Dang
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Amnah Yamani
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Lisa Waggoner
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Simone Vanoni
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Taeko Noah
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - David Wu
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Anna Kordowski
- Institute for Systemic Inflammation Research, University of Lübeck, 23562 Lübeck, Germany
| | - Jörg Köhl
- Immunobiology, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
- Institute for Systemic Inflammation Research, University of Lübeck, 23562 Lübeck, Germany
| | - Kasper Hoebe
- Immunobiology, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Senad Divanovic
- Immunobiology, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
| | - Simon P. Hogan
- Division of Allergy and Immunology, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45229
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Yamada C, Mogami S, Hattori T. Psychological stress exposure to aged mice causes abnormal feeding patterns with changes in the bout number. Aging (Albany NY) 2017; 9:2269-2287. [PMID: 29129830 PMCID: PMC5723686 DOI: 10.18632/aging.101320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 11/02/2017] [Indexed: 12/11/2022]
Abstract
Stress responses are affected by aging. However, studies on stress-related changes in feeding patterns with aging subject are minimal. We investigated feeding patterns induced by two psychological stress models, revealing characteristics of stress-induced feeding patterns as “meal” and “bout” (defined as the minimum feeding behavior parameters) in aged mice. Feeding behaviors of C57BL/6J mice were monitored for 24 h by an automatic monitoring device. Novelty stress reduced the meal amount over the 24 h in both young and aged mice, but as a result of a time course study it was persistent in aged mice. In addition, the decreased bout number was more pronounced in aged mice than in young mice. The 24-h meal and bout parameters did not change in either the young or aged mice following water avoidance stress (WAS). However, the meal amount and bout number increased in aged mice for 0–6 h after WAS exposure but remained unchanged in young mice. Our findings suggest that changes in bout number may lead to abnormal stress-related feeding patterns and may be one tool for evaluating eating abnormality in aged mice.
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Affiliation(s)
- Chihiro Yamada
- Tsumura Research Laboratories, Tsumura & Co., Ibaraki, Japan
| | - Sachiko Mogami
- Tsumura Research Laboratories, Tsumura & Co., Ibaraki, Japan
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Ayyadurai S, Gibson AJ, D'Costa S, Overman EL, Sommerville LJ, Poopal AC, Mackey E, Li Y, Moeser AJ. Frontline Science: Corticotropin-releasing factor receptor subtype 1 is a critical modulator of mast cell degranulation and stress-induced pathophysiology. J Leukoc Biol 2017; 102:1299-1312. [PMID: 28684600 DOI: 10.1189/jlb.2hi0317-088rr] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 05/28/2017] [Accepted: 06/05/2017] [Indexed: 12/23/2022] Open
Abstract
Life stress is a major risk factor in the onset and exacerbation of mast cell-associated diseases, including allergy/anaphylaxis, asthma, and irritable bowel syndrome. Although it is known that mast cells are highly activated upon stressful events, the mechanisms by which stress modulates mast cell function and disease pathophysiology remains poorly understood. Here, we investigated the role of corticotropin-releasing factor receptor subtype 1 (CRF1) in mast cell degranulation and associated disease pathophysiology. In a mast cell-dependent model of IgE-mediated passive systemic anaphylaxis (PSA), prophylactic administration of the CRF1-antagonist antalarmin attenuated mast cell degranulation and hypothermia. Mast cell-deficient KitW-sh/W-sh mice engrafted with CRF1-/- bone marrow-derived mast cells (BMMCs) exhibited attenuated PSA-induced serum histamine, hypothermia, and clinical scores compared with wild-type BMMC-engrafted KitW-sh/W-sh mice. KitW-sh/W-sh mice engrafted with CRF1-/- BMMCs also exhibited suppressed in vivo mast cell degranulation and intestinal permeability in response to acute restraint stress. Genetic and pharmacologic experiments with murine BMMCs, rat RBL-2H3, and human LAD2 mast cells demonstrated that although CRF1 activation did not directly induce MC degranulation, CRF1 signaling potentiated the degranulation responses triggered by diverse mast cell stimuli and was associated with enhanced release of Ca2+ from intracellular stores. Taken together, our results revealed a prominent role for CRF1 signaling in mast cells as a positive modulator of stimuli-induced degranulation and in vivo pathophysiologic responses to immunologic and psychologic stress.
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Affiliation(s)
- Saravanan Ayyadurai
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA
| | | | - Susan D'Costa
- Department of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Elizabeth L Overman
- Department of Biology, Methodist University, Fayetteville, North Carolina, USA
| | - Laura J Sommerville
- Department of Pathology, Duke University, School of Medicine, Durham, North Carolina, USA
| | - Ashwini C Poopal
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA
| | - Emily Mackey
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA.,Comparative Biomedical Sciences Graduate Program, North Carolina State University, Raleigh, North Carolina, USA
| | - Yihang Li
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA
| | - Adam J Moeser
- Gastrointestinal Stress Biology Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA; .,Neuroscience Program, Michigan State University, East Lansing, Michigan, USA; and.,Department of Physiology, Michigan State University, East Lansing, Michigan, USA
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Hattay P, Prusator DK, Tran L, Greenwood-Van Meerveld B. Psychological stress-induced colonic barrier dysfunction: Role of immune-mediated mechanisms. Neurogastroenterol Motil 2017; 29. [PMID: 28300333 DOI: 10.1111/nmo.13043] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 01/09/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND Evidence suggests that patients with irritable bowel syndrome (IBS) exhibit increases in gut permeability and alterations in tight junction (TJ) protein expression. Although psychological stress worsens IBS symptoms, the mechanisms by which stress enhances gut permeability and affects TJ protein expression remain to be determined. Here, we test the hypothesis that chronic intermittent psychological stress activates the release of proinflammatory cytokines to alter TJ proteins and promotes increased gut permeability. METHODS Male Fischer-344 rats were subjected to 1 hour of water avoidance stress (WAS) or SHAM stress per day for 7 days. Following the stress protocol, colonic permeability was measured via transepithelial electrical resistance (TEER) and macromolecular flux of horseradish peroxidase (HRP). In tissue isolated from rats exposed to the WAS or SHAM stress, TJ proteins claudin-2, junctional adhesion molecule-A (JAM-A) and zonula occluden-1 (ZO-1) were measured via Western blotting, histological appearance of the colonic segments was assessed via hematoxylin and eosin staining, and an inflammatory cytokine panel was quantified via quantitative reverse transcription-polymerase chain reaction. KEY RESULTS Repetitive daily exposure to WAS decreased the TEER, increased the macromolecular flux of HRP, and altered the expression of claudin-2, JAM-A and ZO-1 proteins within colonic tissue compared to SHAM controls. In the absence of a histologically defined inflammation, the cytokine profiles of WAS-treated animals revealed an increase in interleukin-1β and tumor necrosis factor (TNF)-α. Subsequent analysis revealed a significant positive correlation between TNF-α and expression of TJ protein claudin-2. CONCLUSIONS & INFERENCES Our findings suggest that chronic stress increases colonic permeability via sub-inflammatory cytokine-mediated remodeling of TJ protein expression.
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Affiliation(s)
- P Hattay
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - D K Prusator
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - L Tran
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - B Greenwood-Van Meerveld
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.,VA Medical Center, Oklahoma City, OK, USA.,Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
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31
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Calcium-mediated oxidative stress: a common mechanism in tight junction disruption by different types of cellular stress. Biochem J 2017; 474:731-749. [PMID: 28057718 DOI: 10.1042/bcj20160679] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/10/2016] [Accepted: 01/05/2017] [Indexed: 02/07/2023]
Abstract
The role of reactive oxygen species (ROS) in osmotic stress, dextran sulfate sodium (DSS) and cyclic stretch-induced tight junction (TJ) disruption was investigated in Caco-2 cell monolayers in vitro and restraint stress-induced barrier dysfunction in mouse colon in vivo Live cell imaging showed that osmotic stress, cyclic stretch and DSS triggered rapid production of ROS in Caco-2 cell monolayers, which was blocked by depletion of intracellular Ca2+ by 1,2-bis-(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid. Knockdown of CaV1.3 or TRPV6 channels blocked osmotic stress and DSS-induced ROS production and attenuated TJ disruption and barrier dysfunction. N-Acetyl l-cysteine (NAC) and l-NG-Nitroarginine methyl ester (l-NAME) blocked stress-induced TJ disruption and barrier dysfunction. NAC and l-NAME also blocked stress-induced activation of c-Jun N-terminal kinase (JNK) and c-Src. ROS was colocalized with the mitochondrial marker in stressed cells. Cyclosporin A blocked osmotic stress and DSS-induced ROS production, barrier dysfunction, TJ disruption and JNK activation. Mitochondria-targeted Mito-TEMPO blocked osmotic stress and DSS-induced barrier dysfunction and TJ disruption. Chronic restraint stress in mice resulted in the elevation of intracellular Ca2+, activation of JNK and c-Src, and disruption of TJ in the colonic epithelium. Furthermore, corticosterone administration induced JNK and c-Src activation, TJ disruption and protein thiol oxidation in colonic mucosa. The present study demonstrates that oxidative stress is a common signal in the mechanism of TJ disruption in the intestinal epithelium by different types of cellular stress in vitro and bio behavioral stress in vivo.
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Chronic social stress in pigs impairs intestinal barrier and nutrient transporter function, and alters neuro-immune mediator and receptor expression. PLoS One 2017; 12:e0171617. [PMID: 28170426 PMCID: PMC5295718 DOI: 10.1371/journal.pone.0171617] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/23/2017] [Indexed: 12/17/2022] Open
Abstract
Psychosocial stress is a major factor driving gastrointestinal (GI) pathophysiology and disease susceptibility in humans and animals. The mechanisms governing susceptibility to stress-induced GI disease remain poorly understood. In the present study, we investigated the influence of chronic social stress (CSS) in pigs, induced by 7 d of chronic mixing/crowding stress, on intestinal barrier and nutrient transport function, corticotropin releasing factor (CRF) signaling and immunological responses. Results from this study showed that CSS resulted in a significant impairment of ileal and colonic barrier function indicated by reduced transepithelial electrical resistance (TER) in the ileum and increased FD4 flux in the ileum (by 0.8 fold) and colon (by 0.7 fold). Ileal sodium glucose linked transporter 1 (SGLT-1) function, measured as glucose-induced changes in short-circuit current (Isc), was diminished (by 52%) in CSS pigs, associated with reduced body weight gain and feed efficiency. Although reductions in SGLT-1 function were observed in CSS pigs, mRNA expression for SGLT-1, villus heights were increased in CSS pigs. Corticotropin releasing factor (CRF) mRNA was upregulated (by 0.9 fold) in the ileum of CSS pigs but not in the colon. Urocortin 2 (Ucn2) mRNA was upregulated (by 1.5 fold) in the colon of CSS pigs, but not in the ileum. In CSS pigs, a downregulation of pro-inflammatory cytokines mRNA (IL1B, TNFA, IL8, and IL6) was observed in both ileum and colon, compared with controls. In contrast CSS induced a marked upregulation of mRNA for IL10 and mast cell chymase gene (CMA1) in the ileum and colon. Together, these data demonstrate that chronic stress in pigs results in significant alterations in intestinal barrier and nutrient transport function and neuro-immune mediator and receptor expression.
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Fish oil enhances intestinal barrier function and inhibits corticotropin-releasing hormone/corticotropin-releasing hormone receptor 1 signalling pathway in weaned pigs after lipopolysaccharide challenge. Br J Nutr 2016; 115:1947-57. [PMID: 27080003 DOI: 10.1017/s0007114516001100] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Stress induces injury in intestinal barrier function in piglets. Long-chain n-3 PUFA have been shown to exhibit potential immunomodulatory and barrier protective effects in animal models and clinical trials. In addition, corticotropin-releasing hormone (CRH)/CRH receptor (CRHR) signalling pathways play an important role in stress-induced alterations of intestinal barrier function. We hypothesised that fish oil could affect intestinal barrier function and CRH/CRHR signalling pathways. In total, thirty-two weaned pigs were allocated to one of four treatments. The experiment consisted of a 2×2 factorial design, and the main factors included immunological challenge (saline or lipopolysaccharide (LPS)) and diet (5 % maize oil or 5 % fish oil). On d 19 of the trial, piglets were treated with saline or LPS. At 4 h after injection, all pigs were killed, and the mesenteric lymph nodes (MLN), liver, spleen and intestinal samples were collected. Fish oil decreased bacterial translocation incidence and the number of translocated micro-organisms in the MLN. Fish oil increased intestinal claudin-1 protein relative concentration and villus height, as well as improved the intestinal morphology. In addition, fish oil supplementation increased intestinal intraepithelial lymphocyte number and prevented elevations in intestinal mast cell and neutrophil numbers induced by LPS challenge. Moreover, fish oil tended to decrease the mRNA expression of intestinal CRHR1, CRH and glucocorticoid receptors. These results suggest that fish oil supplementation improves intestinal barrier function and inhibits CRH/CRHR1 signalling pathway and mast cell tissue density.
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Carlitz EHD, Miller R, Kirschbaum C, Gao W, Hänni DC, van Schaik CP. Measuring Hair Cortisol Concentrations to Assess the Effect of Anthropogenic Impacts on Wild Chimpanzees (Pan troglodytes). PLoS One 2016; 11:e0151870. [PMID: 27050418 PMCID: PMC4822880 DOI: 10.1371/journal.pone.0151870] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 03/04/2016] [Indexed: 01/04/2023] Open
Abstract
Non-human primates face major environmental changes due to increased human impacts all over the world. Although some species are able to survive in certain landscapes with anthropogenic impact, their long-term viability and fitness may be decreased due to chronic stress. Here we assessed long-term stress levels through cortisol analysis in chimpanzee hair obtained from sleeping nests in northwestern Uganda, in order to estimate welfare in the context of ecotourism, forest fragmentation with human-wildlife conflicts, and illegal logging with hunting activity (albeit not of primates), compared with a control without human contact or conflict. Concerning methodological issues, season [F(2,129) = 37.4, p < 0.0001, r2 = 0.18] and the age of nests [F(2,178) = 20.3, p < 0.0001, r2 = 0.11] significantly predicted hair cortisol concentrations (HCC). With regard to effects of anthropogenic impacts, our results neither showed elevation of HCC due to ecotourism, nor due to illegal logging compared to their control groups. We did, however, find significantly increased HCC in the fragment group compared to chimpanzees living in a nearby intact forest [F(1,88) = 5.0, p = 0.03, r2 = 0.20]. In conclusion, our results suggest that hair cortisol analysis is a powerful tool that can help understanding the impact of anthropogenic disturbances on chimpanzee well-being and could be applied to other great ape species.
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Affiliation(s)
- Esther H. D. Carlitz
- Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- Department of Psychology, Technische Universität Dresden, Dresden, Germany
- The Jane Goodall Institute Switzerland, Zurich, Switzerland
- * E-mail:
| | - Robert Miller
- Department of Psychology, Technische Universität Dresden, Dresden, Germany
| | - Clemens Kirschbaum
- Department of Psychology, Technische Universität Dresden, Dresden, Germany
| | - Wei Gao
- Department of Psychology, Technische Universität Dresden, Dresden, Germany
| | - Daniel C. Hänni
- Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- The Jane Goodall Institute Switzerland, Zurich, Switzerland
| | - Carel P. van Schaik
- Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
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Pigrau M, Rodiño-Janeiro BK, Casado-Bedmar M, Lobo B, Vicario M, Santos J, Alonso-Cotoner C. The joint power of sex and stress to modulate brain-gut-microbiota axis and intestinal barrier homeostasis: implications for irritable bowel syndrome. Neurogastroenterol Motil 2016; 28:463-86. [PMID: 26556786 DOI: 10.1111/nmo.12717] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 10/05/2015] [Indexed: 02/06/2023]
Abstract
BACKGROUND Intestinal homeostasis is a dynamic process that takes place at the interface between the lumen and the mucosa of the gastrointestinal tract, where a constant scrutiny for antigens and toxins derived from food and microorganisms is carried out by the vast gut-associated immune system. Intestinal homeostasis is preserved by the ability of the mucus layer and the mucosal barrier to keep the passage of small-sized and antigenic molecules across the epithelium highly selective. When combined and preserved, immune surveillance and barrier's selective permeability, the host capacity of preventing the development of intestinal inflammation is optimized, and viceversa. In addition, the brain-gut-microbiome axis, a multidirectional communication system that integrates distant and local regulatory networks through neural, immunological, metabolic, and hormonal signaling pathways, also regulates intestinal function. Dysfunction of the brain-gut-microbiome axis may induce the loss of gut mucosal homeostasis, leading to uncontrolled permeation of toxins and immunogenic particles, increasing the risk of appearance of intestinal inflammation, mucosal damage, and gut disorders. Irritable bowel syndrome is prevalent stress-sensitive gastrointestinal disorder that shows a female predominance. Interestingly, the role of stress, sex and gonadal hormones in the regulation of intestinal mucosal and the brain-gut-microbiome axis functioning is being increasingly recognized. PURPOSE We aim to critically review the evidence linking sex, and stress to intestinal barrier and brain-gut-microbiome axis dysfunction and the implications for irritable bowel syndrome.
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Affiliation(s)
- M Pigrau
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada.,Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - B K Rodiño-Janeiro
- Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - M Casado-Bedmar
- Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - B Lobo
- Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - M Vicario
- Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain
| | - J Santos
- Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain
| | - C Alonso-Cotoner
- Laboratory of Neuro-immuno-gastroenterology, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitario Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain
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Yarandi SS, Peterson DA, Treisman GJ, Moran TH, Pasricha PJ. Modulatory Effects of Gut Microbiota on the Central Nervous System: How Gut Could Play a Role in Neuropsychiatric Health and Diseases. J Neurogastroenterol Motil 2016; 22:201-12. [PMID: 27032544 PMCID: PMC4819858 DOI: 10.5056/jnm15146] [Citation(s) in RCA: 157] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 01/12/2016] [Accepted: 01/27/2016] [Indexed: 12/11/2022] Open
Abstract
Gut microbiome is an integral part of the Gut-Brain axis. It is becoming increasingly recognized that the presence of a healthy and diverse gut microbiota is important to normal cognitive and emotional processing. It was known that altered emotional state and chronic stress can change the composition of gut microbiome, but it is becoming more evident that interaction between gut microbiome and central nervous system is bidirectional. Alteration in the composition of the gut microbiome can potentially lead to increased intestinal permeability and impair the function of the intestinal barrier. Subsequently, neuro-active compounds and metabolites can gain access to the areas within the central nervous system that regulate cognition and emotional responses. Deregulated inflammatory response, promoted by harmful microbiota, can activate the vagal system and impact neuropsychological functions. Some bacteria can produce peptides or short chain fatty acids that can affect gene expression and inflammation within the central nervous system. In this review, we summarize the evidence supporting the role of gut microbiota in modulating neuropsychological functions of the central nervous system and exploring the potential underlying mechanisms.
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Affiliation(s)
- Shadi S Yarandi
- Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Daniel A Peterson
- Division of Immunology, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Glen J Treisman
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Timothy H Moran
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Pankaj J Pasricha
- Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
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37
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Wouters MM, Vicario M, Santos J. The role of mast cells in functional GI disorders. Gut 2016; 65:155-68. [PMID: 26194403 DOI: 10.1136/gutjnl-2015-309151] [Citation(s) in RCA: 222] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Accepted: 06/30/2015] [Indexed: 02/06/2023]
Abstract
Functional gastrointestinal disorders (FGIDs) are characterized by chronic complaints arising from disorganized brain-gut interactions leading to dysmotility and hypersensitivity. The two most prevalent FGIDs, affecting up to 16-26% of worldwide population, are functional dyspepsia and irritable bowel syndrome. Their etiopathogenic mechanisms remain unclear, however, recent observations reveal low-grade mucosal inflammation and immune activation, in association with impaired epithelial barrier function and aberrant neuronal sensitivity. These findings come to challenge the traditional view of FGIDs as pure functional disorders, and relate the origin to a tangible organic substrate. The mucosal inflammatory infiltrate is dominated by mast cells, eosinophils and intraepithelial lymphocytes in the intestine of FGIDs. It is well established that mast cell activation can generate epithelial and neuro-muscular dysfunction and promote visceral hypersensitivity and altered motility patterns in FGIDs, postoperative ileus, food allergy and inflammatory bowel disease. This review will discuss the role of mucosal mast cells in the gastrointestinal tract with a specific focus on recent advances in disease mechanisms and clinical management in irritable bowel syndrome and functional dyspepsia.
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Affiliation(s)
- Mira M Wouters
- Translational Research Center for Gastrointestinal Disorders (TARGID), University Hospital Leuven, Leuven, Belgium
| | - Maria Vicario
- Neuro-immuno-gastroenterology Laboratory, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitari Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Barcelona, Spain
| | - Javier Santos
- Neuro-immuno-gastroenterology Laboratory, Digestive Diseases Research Unit. Vall d'Hebron Institut de Recerca, Department of Gastroenterology, Hospital Universitari Vall d'Hebron & Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Barcelona, Spain
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38
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Sledd J, Wu D, Ahrens R, Lee J, Waggoner L, Tsai YT, Wang YH, Hogan SP. Loss of IL-4Rα-mediated PI3K signaling accelerates the progression of IgE/mast cell-mediated reactions. IMMUNITY INFLAMMATION AND DISEASE 2015; 3:420-30. [PMID: 26734464 PMCID: PMC4693723 DOI: 10.1002/iid3.80] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 07/27/2015] [Accepted: 08/10/2015] [Indexed: 02/06/2023]
Abstract
Clinical and experimental evidence indicate that polymorphisms within the interleukin 4 (IL‐4) receptor (IL‐4R) chain are sufficient for altered strength of IL‐4/IL‐13 signaling, leading to an exaggerated allergic inflammatory response and increase susceptibility to allergic phenotypes. In the present study, we show that ablation of IL‐4Rα–induced phosphatidylinositol 3‐kinase (PI3K) activating signal by germline point mutation within the IL‐4Rα motif (Y500F) did not alter susceptibility to IgE‐mediated, food‐induced experimental anaphylaxis. Moreover, diarrhea occurrence, antigen‐specific IgE and intestinal mastocytosis were comparable between WT and IL‐4RαY500F mice. However, mice unable to stimulate IL‐4Rα–mediated PI3K signaling had accelerated disease progression. Notably, the accelerated anaphylactic response was associated with more rapid histamine‐induced hypovolemia. Mechanistic in vitro and in vivo analyses revealed that endothelial IL‐4Rα PI3K signaling negatively regulates the histamine‐induced endothelial leak response. These results define an unanticipated role for IL‐4Rα–mediated PI3K signaling in negative regulation of IgE‐mediated anaphylactic reactions.
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Affiliation(s)
- Jane Sledd
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - David Wu
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - Richard Ahrens
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - Jeebong Lee
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - Lisa Waggoner
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - Ying Ting Tsai
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - Yui-Hsi Wang
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
| | - Simon P Hogan
- Divisions of Allergy and Immunology and of Immunobiology Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Children's Hospital Medical Center 3333 Burnet Avenue Cincinnati OH 45229
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Rodiño-Janeiro BK, Alonso-Cotoner C, Pigrau M, Lobo B, Vicario M, Santos J. Role of Corticotropin-releasing Factor in Gastrointestinal Permeability. J Neurogastroenterol Motil 2015; 21:33-50. [PMID: 25537677 PMCID: PMC4288093 DOI: 10.5056/jnm14084] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/06/2014] [Accepted: 10/07/2014] [Indexed: 12/11/2022] Open
Abstract
The interface between the intestinal lumen and the mucosa is the location where the majority of ingested immunogenic particles face the scrutiny of the vast gastrointestinal immune system. Upon regular physiological conditions, the intestinal micro-flora and the epithelial barrier are well prepared to process daily a huge amount of food-derived antigens and non-immunogenic particles. Similarly, they are ready to prevent environmental toxins and microbial antigens to penetrate further and interact with the mucosal-associated immune system. These functions promote the development of proper immune responses and oral tolerance and prevent disease and inflammation. Brain-gut axis structures participate in the processing and execution of response signals to external and internal stimuli. The brain-gut axis integrates local and distant regulatory networks and super-systems that serve key housekeeping physiological functions including the balanced functioning of the intestinal barrier. Disturbance of the brain-gut axis may induce intestinal barrier dysfunction, increasing the risk of uncontrolled immunological reactions, which may indeed trigger transient mucosal inflammation and gut disease. There is a large body of evidence indicating that stress, through the brain-gut axis, may cause intestinal barrier dysfunction, mainly via the systemic and peripheral release of corticotropin-releasing factor. In this review, we describe the role of stress and corticotropin-releasing factor in the regulation of gastrointestinal permeability, and discuss the link to both health and pathological conditions.
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Affiliation(s)
- Bruno K Rodiño-Janeiro
- Neuro-Immuno-Gastroenterology Group, Digestive Diseases Research Unit, Gastroenterology Department, Hospital Universitari Vall d'Hebron, Vall d' Hebron Research Institute; and Department of Medicine, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
| | - Carmen Alonso-Cotoner
- Neuro-Immuno-Gastroenterology Group, Digestive Diseases Research Unit, Gastroenterology Department, Hospital Universitari Vall d'Hebron, Vall d' Hebron Research Institute; and Department of Medicine, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
| | - Marc Pigrau
- Neuro-Immuno-Gastroenterology Group, Digestive Diseases Research Unit, Gastroenterology Department, Hospital Universitari Vall d'Hebron, Vall d' Hebron Research Institute; and Department of Medicine, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
| | - Beatriz Lobo
- Neuro-Immuno-Gastroenterology Group, Digestive Diseases Research Unit, Gastroenterology Department, Hospital Universitari Vall d'Hebron, Vall d' Hebron Research Institute; and Department of Medicine, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
| | - María Vicario
- Neuro-Immuno-Gastroenterology Group, Digestive Diseases Research Unit, Gastroenterology Department, Hospital Universitari Vall d'Hebron, Vall d' Hebron Research Institute; and Department of Medicine, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
| | - Javier Santos
- Neuro-Immuno-Gastroenterology Group, Digestive Diseases Research Unit, Gastroenterology Department, Hospital Universitari Vall d'Hebron, Vall d' Hebron Research Institute; and Department of Medicine, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Barcelona, Spain
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Intestinal barrier function and the brain-gut axis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 817:73-113. [PMID: 24997030 DOI: 10.1007/978-1-4939-0897-4_4] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The luminal-mucosal interface of the intestinal tract is the first relevant location where microorganism-derived antigens and all other potentially immunogenic particles face the scrutiny of the powerful mammalian immune system. Upon regular functioning conditions, the intestinal barrier is able to effectively prevent most environmental and external antigens to interact openly with the numerous and versatile elements that compose the mucosal-associated immune system. This evolutionary super system is capable of processing an astonishing amount of antigens and non-immunogenic particles, approximately 100 tons in one individual lifetime, only considering food-derived components. Most important, to develop oral tolerance and proper active immune responses needed to prevent disease and inflammation, this giant immunogenic load has to be managed in a way that physiological inflammatory balance is constantly preserved. Adequate functioning of the intestinal barrier involves local and distant regulatory networks integrating the so-called brain-gut axis. Along this complex axis both brain and gut structures participate in the processing and execution of response signals to external and internal changes coming from the digestive tract, using multidirectional pathways to communicate. Dysfunction of brain-gut axis facilitates malfunctioning of the intestinal barrier, and vice versa, increasing the risk of uncontrolled immunological reactions that may trigger mucosal and brain low-grade inflammation, a putative first step to the initiation of more permanent gut disorders. In this chapter, we describe the structure, function and interactions of intestinal barrier, microbiota and brain-gut axis in both healthy and pathological conditions.
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Housing conditions affect rat responses to two types of ambiguity in a reward-reward discrimination cognitive bias task. Behav Brain Res 2014; 274:73-83. [PMID: 25106739 PMCID: PMC4199117 DOI: 10.1016/j.bbr.2014.07.048] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 07/25/2014] [Accepted: 07/28/2014] [Indexed: 12/25/2022]
Abstract
We investigated how an unpredictable housing treatment (UHT) influenced measures of rat affect. Control rats showed more anxiety-like behaviour in open-field and elevated plus maze tests than UHT rats. Controls also made more ‘pessimistic’ decisions in an automated cognitive bias task. Our go/go reward–reward task was learnt faster than previous automated go/go tasks. We developed a new ambiguity test that may probe biases in attentional processes.
Decision-making under ambiguity in cognitive bias tasks is a promising new indicator of affective valence in animals. Rat studies support the hypothesis that animals in a negative affective state evaluate ambiguous cues negatively. Prior automated operant go/go judgement bias tasks have involved training rats that an auditory cue of one frequency predicts a Reward and a cue of a different frequency predicts a Punisher (RP task), and then measuring whether ambiguous cues of intermediate frequency are judged as predicting reward (‘optimism’) or punishment (‘pessimism’). We investigated whether an automated Reward–Reward (RR) task yielded similar results to, and was faster to train than, RP tasks. We also introduced a new ambiguity test (simultaneous presentation of the two training cues) alongside the standard single ambiguous cue test. Half of the rats experienced an unpredictable housing treatment (UHT) designed to induce a negative state. Control rats were relatively ‘pessimistic’, whilst UHT rats were quicker, but no less accurate, in their responses in the RR test, and showed less anxiety-like behaviour in independent tests. A possible reason for these findings is that rats adapted to and were stimulated by UHT, whilst control rats in a predictable environment were more sensitive to novelty and change. Responses in the new ambiguity test correlated positively with those in single ambiguous cue tests, and may provide a measure of attention bias. The RR task was quicker to train than previous automated RP tasks. Together, they could be used to disentangle how reward and punishment processes underpin affect-induced cognitive biases.
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Neilan NA, Garg UC, Schurman JV, Friesen CA. Intestinal permeability in children/adolescents with functional dyspepsia. BMC Res Notes 2014; 7:275. [PMID: 24886078 PMCID: PMC4022401 DOI: 10.1186/1756-0500-7-275] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 04/17/2014] [Indexed: 01/05/2023] Open
Abstract
Background An altered intestinal mucosal barrier has been demonstrated in subsets of patients with IBS and FAP and may be an additional biological factor contributing to symptom generation in children with FD. The objective of this study was to determine if intestinal permeability is increased in children/adolescents with functional dyspepsia (FD) and whether intestinal permeability is correlated with mucosal inflammation and/or symptoms of anxiety or depression in this population. Methods A sugar absorption test was performed in 19 patients with FD and 19 controls. Anxiety and depression were assessed in both groups utilizing a standard questionnaire. In FD patients, duodenal mean and peak mast cell and eosinophil densities were determined. Results Intestinal permeability as measured by the sugar absorption test did not differ between children with FD and controls. In children with FD, there was no correlation between permeability and mast cell density, eosinophil density, anxiety scores, or depression scores, respectively. Conclusions Pediatric FD does not appear to be associated with increased small bowel intestinal permeability, however, there are some limitations to the current study. Trial registration ClinicalTrials.gov;
NCT00363597.
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Affiliation(s)
| | | | | | - Craig A Friesen
- Division of Gastroenterology, Hepatology, & Nutrition, Children's Mercy Hospitals & Clinics, 2401 Gillham Road, Kansas City, MO 64108, USA.
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Theoharides TC. Mast cells in irritable bowel syndrome and ulcerative colitis: function not numbers is what makes all the difference. Dig Dis Sci 2014; 59:897-8. [PMID: 24445729 PMCID: PMC7003572 DOI: 10.1007/s10620-013-2988-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 12/05/2013] [Indexed: 12/13/2022]
Affiliation(s)
- Theoharis C. Theoharides
- Molecular Immunopharmacology and Drug Discovery Laboratory, Department of Integrative Physiology and Pathobiology, Tufts University School of Medicine, Boston, MA 02111, USA,Sackler School of Graduate Biomedical Sciences, Tufts University, Boston, MA 02111, USA,Department of Internal Medicine, Tufts University School of Medicine and Tufts Medical Center, Boston, MA 02111, USA,Department of Psychiatry, Tufts University School of Medicine and Tufts Medical Center, Boston, MA 02111, USA
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Farré R. Pathophysiology of gastro-esophageal reflux disease: a role for mucosa integrity? Neurogastroenterol Motil 2013; 25:783-99. [PMID: 23937353 DOI: 10.1111/nmo.12201] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 07/16/2013] [Indexed: 12/11/2022]
Abstract
BACKGROUND Gastro-esophageal reflux disease (GERD) is very prevalent and has a high burden on health security system costs. Nevertheless, pathophysiology is complex and not well-understood. Several mechanisms have been proposed: decreased salivation, impaired esophageal clearance, decreased lower esophageal sphincter pressure resting tone, presence of hiatal hernia, increased number of transient lower esophageal sphincter relaxations (TLESRs), increased acid, and pepsin secretion, pyloric incompetence provoking duodeno-gastro-esophageal reflux of bile acids and trypsin. Independent of the relevance of each mechanism, the ultimate phenomenon is that mucosal epithelium is exposed for a longer time to agents as acid and pepsin or is in contact to luminal agents not commonly present in gastric refluxate as trypsin or bile acids. This leads to a visible damage of the epithelium (erosive esophagitis -EE) or impairing mucosal integrity without any sign of macroscopic alteration as occurs in non-erosive reflux disease (NERD). Luminal factors are not the only responsible for such impairment; more recent data indicate that endogenous factors may also play a role. PURPOSE This review will update the most recent findings on the putative pathophysiological mechanisms and specially will focus on the role of esophageal mucosal integrity in GERD. Methodologies used for the evaluation of mucosal integrity, its relevance in EE and NERD, its involvement in symptoms perception and the effect of luminal and endogenous factors will be discussed.
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Affiliation(s)
- R Farré
- Translational Research Center for Gastrointestinal Disorders, KU Leuven, Leuven, Belgium; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Instituto de Salud Carlos II, Madrid, Spain
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Stress and food allergy: mechanistic considerations. Ann Allergy Asthma Immunol 2013; 112:296-301. [PMID: 24428964 DOI: 10.1016/j.anai.2013.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/24/2013] [Accepted: 08/02/2013] [Indexed: 02/08/2023]
Abstract
Recent years have seen a marked increase in food allergy prevalence among children, particularly in Western countries, that cannot be explained by genetic factors alone. This has resulted in an increased effort to identify environmental risk factors underlying food allergies and to understand how these factors may be modified through interventions. Food allergy is an immune-mediated adverse reaction to food. Consequently, considerations of candidate risk factors have begun to focus on environmental influences that perturb the healthy development of the emerging immune system during critical periods of development (eg, prenatally and during early childhood), particularly in the gut. Given that psychosocial stress is known to play an important role in other allergic and inflammatory diseases, such as asthma, its potential role in food allergy is a growing area of research. However, research to date has largely focused on animal studies. This review synthesizes relevant animal research and epidemiological data, providing proof of concept for moderating influences of psychological stress on food allergy outcomes in humans. Pathways that may underlie associations between psychosocial stress and the expression of food allergy are discussed.
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Hill LT, Kidson SH, Michell WL. Corticotropin-releasing factor: a possible key to gut dysfunction in the critically ill. Nutrition 2013; 29:948-52. [PMID: 23484741 DOI: 10.1016/j.nut.2012.12.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 12/19/2012] [Accepted: 12/20/2012] [Indexed: 12/14/2022]
Abstract
Critically ill patients frequently display unexplained or incompletely explained features of gastrointestinal (GI) dysfunction, including gastric stasis, ileus, and diarrhea. This makes nutrition delivery challenging, and may contribute to poor outcomes. The typical bowel dysfunction seen in severely ill patients includes retarded gastric emptying, unsynchronized intestinal motility, and intestinal hyperpermeability. These functional changes appear similar to the corticotropin-releasing factor (CRF)-mediated bowel dysfunctions associated with stress of various types and some GI disorders and diseases. CRF has been shown to be present within the GI tract and its action on CRF receptors within the gut have been shown to reduce gastric emptying, alter intestinal motility, and increase intestinal permeability. However, the precise role of CRF in the GI dysfunction in critical illness remains unclear. In this short review, we provide an update on GI dysfunction during stress and review the possible role of CRF in the aetiology of gut dysfunction. We suggest that activation of CRF signaling pathways in critical illness might be key to understanding the mechanisms underlying the gut dysfunction that impairs enteral feeding in the intensive care unit.
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Affiliation(s)
- Lauren T Hill
- Department of Human Biology, University of Cape Town, Cape Town, South Africa.
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Maslanik T, Tannura K, Mahaffey L, Loughridge AB, Benninson L, Ursell L, Greenwood BN, Knight R, Fleshner M. Commensal bacteria and MAMPs are necessary for stress-induced increases in IL-1β and IL-18 but not IL-6, IL-10 or MCP-1. PLoS One 2012; 7:e50636. [PMID: 23236381 PMCID: PMC3517493 DOI: 10.1371/journal.pone.0050636] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 10/23/2012] [Indexed: 12/11/2022] Open
Abstract
Regular interactions between commensal bacteria and the enteric mucosal immune environment are necessary for normal immunity. Alterations of the commensal bacterial communities or mucosal barrier can disrupt immune function. Chronic stress interferes with bacterial community structure (specifically, α-diversity) and the integrity of the intestinal barrier. These interferences can contribute to chronic stress-induced increases in systemic IL-6 and TNF-α. Chronic stress, however, produces many physiological changes that could indirectly influence immune activity. In addition to IL-6 and TNF-α, exposure to acute stressors upregulates a plethora of inflammatory proteins, each having unique synthesis and release mechanisms. We therefore tested the hypothesis that acute stress-induced inflammatory protein responses are dependent on the commensal bacteria, and more specifically, lipopolysaccharide (LPS) shed from Gram-negative intestinal commensal bacteria. We present evidence that both reducing commensal bacteria using antibiotics and neutralizing LPS using endotoxin inhibitor (EI) attenuates increases in some (inflammasome dependent, IL-1 and IL-18), but not all (inflammasome independent, IL-6, IL-10, and MCP-1) inflammatory proteins in the blood of male F344 rats exposed to an acute tail shock stressor. Acute stress did not impact α- or β- diversity measured using 16S rRNA diversity analyses, but selectively reduced the relative abundance of Prevotella. These findings indicate that commensal bacteria contribute to acute stress-induced inflammatory protein responses, and support the presence of LPS-mediated signaling in stress-evoked cytokine and chemokine production. The selectivity of the commensal bacteria in stress-evoked IL-1β and IL-18 responses may implicate the inflammasome in this response.
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Affiliation(s)
- Thomas Maslanik
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Kate Tannura
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Lucas Mahaffey
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Alice Brianne Loughridge
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Lida Benninson
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Luke Ursell
- Department of Chemistry and Biochemistry, and the Howard Hughes Medical Institute, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Benjamin N. Greenwood
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Rob Knight
- Department of Chemistry and Biochemistry, and the Howard Hughes Medical Institute, University of Colorado at Boulder, Boulder, Colorado, United States of America
| | - Monika Fleshner
- Department of Integrative Physiology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado, United States of America
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Maes M, Kubera M, Leunis JC, Berk M. Increased IgA and IgM responses against gut commensals in chronic depression: further evidence for increased bacterial translocation or leaky gut. J Affect Disord 2012; 141:55-62. [PMID: 22410503 DOI: 10.1016/j.jad.2012.02.023] [Citation(s) in RCA: 312] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 01/26/2012] [Accepted: 02/16/2012] [Indexed: 12/12/2022]
Abstract
BACKGROUND Recently, we discovered that depression is accompanied by increased IgM and IgA responses directed against gram negative gut commensals. The aim of this study was to replicate these findings in a larger study group of depressed patients and to examine the associations between the IgA and IgM responses to gut commensals and staging of depression as well as the fatigue and somatic (F&S) symptoms of depression. METHODS We measured serum concentrations of IgM and IgA against the LPS of gram-negative enterobacteria, i.e. Hafnia alvei, Pseudomonas aeruginosa, Morganella morganii, Pseudomonas putida, Citrobacter koseri, and Klebsiella pneumoniae in 112 depressed patients and 28 normal controls. The severity of F&S symptoms was measured using the Fibromyalgia and Chronic Fatigue Syndrome Rating Scale. RESULTS The prevalences and median values of serum IgM and IgA against LPS of these commensals were significantly higher in depressed patients than in controls. The IgM levels directed against the LPS of these commensal bacteria were significantly higher in patients with chronic depression than in those without. The immune responses directed against LPS were not associated with melancholia or recurrent depression. There was a significant correlation between the IgA response directed against LPS and gastro-intestinal symptoms. DISCUSSION The results indicate that increased bacterial translocation with immune responses to the LPS of commensal bacteria may play a role in the pathophysiology of depression, particularly chronic depression. Bacterial translocation may a) occur secondary to systemic inflammation in depression and intensify and perpetuate the primary inflammatory response once the commensals are translocated; or b) be a primary trigger factor associated with the onset of depression in some vulnerable individuals. The findings suggest that "translocated" gut commensal bacteria activate immune cells to elicit IgA and IgM responses and that this phenomenon may play a role in the pathophysiology of (chronic) depression by causing progressive amplifications of immune pathways.
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Liu X, Li H, Lu A, Zhong Y, Hou X, Wang N, Jia D, Zan J, Zhao H, Xu J, Liu F. Reduction of intestinal mucosal immune function in heat-stressed rats and bacterial translocation. Int J Hyperthermia 2012; 28:756-65. [PMID: 23094661 DOI: 10.3109/02656736.2012.729173] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE The aim of this study was to further understand the effects and mechanism of heat stress on the intestinal mucosal immune system of the rat, including changes in the intestinal mucosal barrier and immune function and their effects on bacterial translocation. MATERIALS AND METHODS Sprague Dawley (SD) rats were randomly divided into control and heat-stress groups. Both groups were housed in a 25°C environment of 60% relative humidity. The heat-stress group was subjected to 40°C for 2 h daily over 3 days. RESULTS Compared with the control group villi length in the small intestines of the heat-stress group was shortened. Jejunal mucosa were seriously damaged and the number of goblet cells in the epithelia of the duodenum and jejunum was significantly reduced. Electron microscopy revealed intestinal mucosal disorder, a large number of exudates of inflammatory fibrous material, fuzzy tight junction structure between epithelial cells, and cell gap increases in the heat-stress group. Transcription of IFN-γ, IL-2, IL-4, and IL-10, was significantly reduced, as was that of the intestinal mucosal immune-related proteins TLR2, TLR4, and IgA. The number of CD3(+) T cells and CD3(+)CD4(+)CD8(-) T cells in the mesenteric lymph nodes (MLNs) was significantly lower, while the number of CD3(+)CD4(-)CD8(+) T cells was significantly increased. The bacteria isolated from the MLNs were Escherichia coli. CONCLUSIONS Heat stress damages rat intestinal mechanical and mucosal immune barriers, and reduces immune function of the intestinal mucosa and mesenteric lymphoid tissues, leading to bacterial translocation.
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Affiliation(s)
- Xiaoxi Liu
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing, P.R. China
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Sundell KS, Sundh H. Intestinal fluid absorption in anadromous salmonids: importance of tight junctions and aquaporins. Front Physiol 2012; 3:388. [PMID: 23060812 PMCID: PMC3460234 DOI: 10.3389/fphys.2012.00388] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Accepted: 09/11/2012] [Indexed: 01/17/2023] Open
Abstract
The anadromous salmonid life cycle includes both fresh water (FW) and seawater (SW) stages. The parr-smolt transformation (smoltification) pre-adapt the fish to SW while still in FW. The osmoregulatory organs change their mode of action from a role of preventing water inflow in FW, to absorb ions to replace water lost by osmosis in SW. During smoltification, the drinking rate increases, in the intestine the ion and fluid transport increases and is further elevated after SW entry. In SW, the intestine absorbs ions to create an inwardly directed water flow which is accomplished by increased Na+, K+-ATPase (NKA) activity in the basolateral membrane, driving ion absorption via ion channels and/or co-transporters. This review will aim at discussing the expression patterns of the ion transporting proteins involved in intestinal fluid absorption in the FW stage, during smoltification and after SW entry. Of equal importance for intestinal fluid absorption as the active absorption of ions is the permeability of the epithelium to ions and water. During the smoltification the increase in NKA activity and water uptake in SW is accompanied by decreased paracellular permeability suggesting a redirection of the fluid movement from a paracellular route in FW, to a transcellular route in SW. Increased transcellular fluid absorption could be achieved by incorporation of aquaporins (AQPs) into the enterocyte membranes and/or by a change in fatty acid profile of the enterocyte lipid bilayer. An increased incorporation of unsaturated fatty acids into the membrane phospholipids will increase water permeability by enhancing the fluidity of the membrane. A second aim of the present review is therefore to discuss the presence and regulation of expression of AQPs in the enterocyte membrane as well as to discuss the profile of fatty acids present in the membrane phospholipids during different stages of the salmonid lifecycle.
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Affiliation(s)
- Kristina S Sundell
- Fish Endocrinology Laboratory, Department of Biology and Environmental Sciences, University of Gothenburg Gothenburg, Sweden
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