V. Stress and irritable bowel syndrome

Area of Science:

• Neurogastroenterology
• Psychosomatic Medicine
• Gastroenterology

Background:

• Stress is a key factor in the development and exacerbation of Irritable Bowel Syndrome (IBS) symptoms.
• The emotional motor system mediates stress effects on gut function via autonomic, neuroendocrine, attentional, and pain pathways.
• IBS patients display amplified responses within this system, impacting gastrointestinal motility, secretion, and visceral perception.

Purpose of the Study:

• To elucidate the role of stress in Irritable Bowel Syndrome (IBS).
• To understand the neural mechanisms underlying altered brain-gut interactions in IBS.
• To explore the utility of animal models in studying IBS pathophysiology.

Main Methods:

• Review of physiological effects of psychological and physical stressors on gut function.
• Analysis of brain-gut interactions mediated by the emotional motor system.
• Examination of functional brain imaging data identifying relevant brain circuits.
• Consideration of proposed animal models for IBS.

Main Results:

• Stressors modulate gut function and brain-gut interactions through the emotional motor system.
• IBS patients exhibit heightened responsiveness, leading to altered gastrointestinal function and visceral perception.
• Functional neuroimaging is identifying brain circuits involved in IBS perceptual changes.

Conclusions:

• The emotional motor system plays a critical role in mediating stress effects on the gut in IBS.
• Altered brain-gut interactions and heightened stress responsiveness characterize IBS.
• Emerging animal models offer promise for further investigation into IBS pathogenesis.