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Gut-derived serotonin contributes to bone deficits in colitis
B Lavoie1, J A Roberts1, M M Haag1
1Department of Neurological Sciences, The University of Vermont, Burlington, VT, USA.
Serotonin (5-HT) contributes to bone loss in inflammatory bowel disease (IBD) models. Inhibiting serotonin synthesis or blocking its receptors significantly reduced bone loss in colitis, suggesting 5-HT plays a key role.
Area of Science:
- Gastroenterology
- Endocrinology
- Bone Biology
Background:
- Inflammatory bowel disease (IBD) is linked to osteoporosis and bone fractures.
- Increased serotonin (5-HT) in the gut mucosa is a hallmark of colitis.
- Gut-derived 5-HT can negatively impact bone mass by activating 5-HT1B receptors.
Purpose of the Study:
- To investigate the role of serotonin (5-HT) in bone loss associated with colitis.
- To test the hypothesis that 5-HT contributes to reduced bone mass in inflammatory bowel disease models.
Main Methods:
- Chronic colitis was induced in mice using dextran sodium sulfate (DSS).
- Bone mass was assessed using micro-computed tomography.
- Mice were treated with a 5-HT synthesis inhibitor (PCPA) or a 5-HT1B receptor antagonist (GR55562).
- Studies included serotonin transporter (SERT)-deficient mice.
Main Results:
- DSS-induced colitis led to elevated circulating 5-HT and decreased trabecular bone mass in mice.
- Treatment with PCPA or GR55562 significantly suppressed colitis-induced bone loss.
- SERT-deficient mice exhibited reduced bone mass, and DSS did not exacerbate these deficits.
Conclusions:
- Serotonin (5-HT) significantly contributes to bone loss observed in colitis models.
- Targeting 5-HT synthesis or its receptors may offer therapeutic strategies for bone loss in IBD.
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