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Gastrointestinal distress to serotonergic challenge: a risk marker for emotional disorder?
John V Campo1, Ronald E Dahl, Douglas E Williamson
1Western Psychiatric Institute and Clinic, University of Pittsburgh Medical Center, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. campojv@msx.upmc.edu
Insights
Children experiencing gastrointestinal distress from a serotonergic challenge are at higher risk for developing major depressive and/or anxiety disorders later in life. This finding highlights a potential link between gut sensitivity and emotional health.
Area of Science:
- Neuroscience
- Psychiatry
- Gastroenterology
Background:
- Serotonin plays a key role in mediating gut sensation and motility.
- Functional gastrointestinal (GI) symptoms are often comorbid with mood and anxiety disorders.
- Understanding the early life predictors of these comorbidities is crucial for timely intervention.
Purpose of the Study:
- To investigate whether gastrointestinal distress following a serotonergic challenge in childhood predicts the later development of major depressive and/or anxiety disorders.
- To explore the association between early-life GI distress and subsequent emotional disorders.
Main Methods:
- A cohort of 119 prepubertal children, initially free of psychiatric disorders, underwent a psychobiological study.
- l-5-hydroxytryptophan was administered to assess serotonergic challenge.
- Children were followed longitudinally for an average of 90.3 months, with psychiatric interviews to identify new-onset mood and anxiety disorders.
Main Results:
- Twenty-three children (19.3%) reported gastrointestinal distress during the serotonergic challenge.
- Children who experienced GI distress were significantly more likely to develop major depressive and/or anxiety disorders (30.4% vs. 10.4%).
- This increased risk remained significant even after controlling for a family history of psychiatric disorder (p = .026).
Conclusions:
- Childhood gastrointestinal distress in response to a serotonergic challenge is a significant predictor of heightened risk for subsequent major depressive and/or anxiety disorders.
- This finding suggests a potential link between serotonergic pathways, gut function, and emotional well-being.
- Further research into serotonergic neurotransmission may elucidate the nonrandom association between functional GI and emotional disorders.
Objective:
Serotonin is an important mediator of gut sensation and motility. The authors' aim was to determine whether inadvertent gastrointestinal (GI) distress to serotonergic challenge predicted future major depressive and/or anxiety disorders in exposed children.
Method:
l-5-hydroxytryptophan was administered to 119 prepubertal children free of psychiatric disorder as part of a psychobiological cohort study initially designed to examine familial loading for mood disorder as the exposure of interest. Subjects were followed longitudinally with standardized psychiatric interviews to identify new-onset mood and anxiety disorders over 90.3 +/- 29.2 months, with the average assessment interval being 16.6 +/- 6.2 months. Reports of GI distress in a subgroup during serotonergic challenge led the authors to examine GI distress to infusion as an exposure post hoc and to perform survival analysis using major depressive and/or anxiety disorders as the outcomes of interest.
Results:
GI distress to serotonergic challenge was experienced by 23 subjects, with 7 (30.4%) developing an emotional disorder during follow-up in comparison to 12 (10.4%) of 96 nondistressed subjects. The distressed group was at significantly greater risk of subsequent major depression and/or anxiety (p =.026), even after controlling for family history of psychiatric disorder.
Conclusions:
GI distress to serotonergic challenge in childhood is associated with heightened risk for subsequent major depressive and/or anxiety disorders. Studies of serotonergic neurotransmission may aid our understanding of nonrandom associations between functional GI symptoms and emotional symptoms and disorders.
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