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Gut-derived serotonin contributes to bone deficits in colitis.

B Lavoie1, J A Roberts1, M M Haag1

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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.

Keywords:
5-HT(1B) receptorDSS-induced colitisPeripheral 5-HTbone loss

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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.