The usefulness of psychotherapy, such as cognitive behavioral therapy (CBT) that encompasses cognitive and behavioral strategies that aim to improve the underlying thinking or behavioral patterns, extends far beyond the treatment of stress-related mood and psychological disorders such as anxiety and depression. 1-3 Nowadays, CBT is also being used to improve the quality of life in patients suffering from chronic pain, such as musculoskeletal pain, 4-6 pelvic pain, 7 and arthritic pain. 8 Clinical evidence suggests that CBT also improves in the overall symptomatology of patients with irritable bowel syndrome (IBS). 9 Irritable bowel syndrome a common gastrointestinal disorders characterized by chronic abdominal pain, due to increased visceral sensitivity, and abnormal bowel habits. These symptoms Abstract Background: Cognitive behavioral therapy (CBT) improves quality of life of patients with irritable bowel syndrome (IBS), a disorder characterized by chronic visceral pain and abnormal bowel habits. Whether CBT can actually improve visceral pain in IBS patients is still unknown. The aim of this study is to evaluate whether environment enrichment (EE), the animal analog of CBT, can prevent stress-induced viscerosomatic hypersensitivity through changes in glucocorticoid receptor (GR) signaling within the central nucleus of the amygdala (CeA).Methods: Rats were housed in either standard housing (SH) or EE for 7 days before and during daily water avoidance stress (WAS) exposure (1-h/d for 7 days). In the first cohort, visceral and somatic sensitivity were assessed via visceromotor response to colorectal distention and von Frey Anesthesiometer 24 hous and 21 days after WAS.In another cohort, the CeA was isolated for GR mRNA quantification.Key Results: Environment enrichment for 7 days before and during the 7 days of WAS persistently attenuated visceral and somatic hypersensitivity when compared to rats placed in SH. Environment enrichment exposure also prevented the WASinduced decrease in GR expression in the CeA.
Conclusion & Inferences:Pre-exposure to short-term EE prevents the stress-induced downregulation of GR, and inhibits visceral and somatic hypersensitivity induced by chronic stress. These results suggest that a positive environment can ameliorate stress-induced pathology and provide a non-pharmacological therapeutic option for disorders such as IBS.
K E Y W O R D Senvironmental enrichment, pain, rat, visceral hypersensitivity