Irritable bowel syndrome (IBS) is one of the most common gastrointestinal disorders. Chronic stress is associated with the onset and exacerbation of symptoms in IBS and female sex is a risk factor for this detrimental stress effect. Perturbations during the pre- and perinatal period or childhood may contribute to the development of IBS in adults. Early life stress is associated with a dysregulated hypothalamic-pituitary-adrenal (HPA) axis. IBS patients report an increased prevalence of early life stress and demonstrate increased HPA axis activity. Our preliminary data shows increased methylation of the glucocorticoid receptor (GR) NR3C1 promoter in IBS patients but none in controls. This finding may be associated with decreased negative feedback of glucocorticoids and HPA axis hyperreactivity in IBS. Rodents exposed to perinatal stress (i.e., maternal separation, [MS]) are predisposed as adult rats to develop stress-induced visceral hypersensitivity, enhanced defecation, intestinal mucosal dysfunction, increased HPA axis responses and anxiety-like behavior and these responses are mediated by activation of corticotropin releasing factor receptor 1 (CRF-R1) signaling pathways. These phenotypic features are homologous to those seen in IBS patients and thus, the MS animal model is a relevant model of IBS. Project 1 focuses on the identification of a biological marker for IBS and associated alterations in the stress response systems, and on a translational approach in rodents to identify alterations in CRF-R1 signaling and GR promoter methylation in specific brain regions and circuitries following early life stress.
Aim A's objective is to conduct a comprehensive genetic, molecular and functional phenotyping of HPA axis in male and female patients with IBS, IC/PBS and controls.
Aim B proposes to establish that perinatal stress (MS) alters the pattern of regional brain CRF and CRF-R1 expression, and DNA methylation of GR promoter region in male and female rats.
Aim C intends to delineate the increased engagement of central stress responsiveness/arousal mechanisms in the rat MS model with an emphasis on identifying homologies of rodent brain imaging with human findings from Project 3.
IBS is a common, female-predominant gastrointestinal disorder that is charaterized by abdominal pain and altered bowel habits. It is associated with a significant health care and economic burden due to a lack of a diagnostic test and effective treatments. Chronic stress is associated with the development of IBS and disease flares. The proposal aims to identify biomarkers for increased stress responsiveness in IBS, which may help predict treatment response and guide the development of more effective therapeutic interventions.
|Videlock, Elizabeth J; Mahurkar-Joshi, Swapna; Hoffman, Jill M et al. (2018) Sigmoid colon mucosal gene expression supports alterations of neuronal signaling in irritable bowel syndrome with constipation. Am J Physiol Gastrointest Liver Physiol 315:G140-G157|
|Bonfiglio, Ferdinando; Zheng, Tenghao; Garcia-Etxebarria, Koldo et al. (2018) Female-Specific Association Between Variants on Chromosome 9 and Self-Reported Diagnosis of Irritable Bowel Syndrome. Gastroenterology 155:168-179|
|Park, S H; Naliboff, B D; Shih, W et al. (2018) Resilience is decreased in irritable bowel syndrome and associated with symptoms and cortisol response. Neurogastroenterol Motil 30:|
|Martin, Clair R; Osadchiy, Vadim; Kalani, Amir et al. (2018) The Brain-Gut-Microbiome Axis. Cell Mol Gastroenterol Hepatol 6:133-148|
|Addante, Raymond; Naliboff, Bruce; Shih, Wendy et al. (2018) Predictors of Health-related Quality of Life in Irritable Bowel Syndrome Patients Compared With Healthy Individuals. J Clin Gastroenterol :|
|Gupta, Arpana; Woodworth, Davis C; Ellingson, Benjamin M et al. (2018) Disease-Related Microstructural Differences in the Brain in Women With Provoked Vestibulodynia. J Pain 19:528.e1-528.e15|
|Gupta, Arpana; Mayer, Emeran A; Labus, Jennifer S et al. (2018) Sex Commonalities and Differences in Obesity-Related Alterations in Intrinsic Brain Activity and Connectivity. Obesity (Silver Spring) 26:340-350|
|Tache, Yvette; Larauche, Muriel; Yuan, Pu-Qing et al. (2018) Brain and Gut CRF Signaling: Biological Actions and Role in the Gastrointestinal Tract. Curr Mol Pharmacol 11:51-71|
|Hoffman, Jill M; Sideri, Aristea; Ruiz, Jonathan J et al. (2018) Mesenteric Adipose-derived Stromal Cells From Crohn's Disease Patients Induce Protective Effects in Colonic Epithelial Cells and Mice With Colitis. Cell Mol Gastroenterol Hepatol 6:1-16|
|Fang, Kai; Law, Ivy Ka Man; Padua, David et al. (2018) MicroRNA-31-3p Is Involved in Substance P (SP)-Associated Inflammation in Human Colonic Epithelial Cells and Experimental Colitis. Am J Pathol 188:586-599|
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