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Endogenous ghrelin and 5-HT regulate interdigestive gastrointestinal contractions in conscious rats.

Publication ,  Journal Article
Taniguchi, H; Ariga, H; Zheng, J; Ludwig, K; Mantyh, C; Pappas, TN; Takahashi, T
Published in: Am J Physiol Gastrointest Liver Physiol
August 2008

Endogenous ghrelin causes interdigestive contractions of the stomach in rats. In contrast, previous studies showed that 5-HT(3) and 5-HT(4) receptors were involved in regulating intestinal interdigestive contractions. We studied the possible role of endogenous ghrelin and 5-HT regulating interdigestive gastrointestinal (GI) contractions in rats. Four strain gauge transducers were implanted on the antrum, duodenum, and proximal and distal jejunum. After an overnight fast, GI contractions were recorded in freely moving conscious rats and ghrelin receptor antagonists [(d-lys3)GHRP6; 1 micromol/kg], 5-HT(3) antagonists (Ondansetron; 0.5 mg/kg) and 5-HT(4) antagonists (GR 125,487; 1 mg/kg) were administered (bolus iv). To evaluate the relationship between the luminal concentrations of 5-HT and phase III-like contractions of the duodenum, duodenal juice was collected via the intraduodenal catheter. 5-HT content of the duodenal juice was measured by HPLC. (d-lys3)GHRP6 significantly attenuated the occurrence and amplitude of phase III-like contractions of the antrum, but not the duodenum and jejunum. 5-HT(4) antagonists significantly reduced spontaneous phase III-like contractions of the jejunum, without affecting those of the antrum and duodenum. In contrast, 5-HT(3) antagonists did not affect phase III-like contractions in GI tract. Luminal concentration of 5-HT at the phase III-like contraction (36.0 +/- 13.3 ng/ml, n = 9) was significantly higher than that at the phase I-like contractions of the duodenum (4.9 +/- 1.6 ng/ml, n = 9, P < 0.05). It is suggested that released ghrelin from the gastric mucosa mediates gastric phase III-like contractions, whereas 5-HT released from enterochromaffin cells of the duodenal mucosa mediates intestinal phase III-like contractions via 5-HT(4) receptors.

Duke Scholars

Published In

Am J Physiol Gastrointest Liver Physiol

DOI

ISSN

0193-1857

Publication Date

August 2008

Volume

295

Issue

2

Start / End Page

G403 / G411

Location

United States

Related Subject Headings

  • Vagotomy
  • Sulfonamides
  • Serotonin
  • Rats, Sprague-Dawley
  • Rats
  • Postprandial Period
  • Ondansetron
  • Oligopeptides
  • Muscle Contraction
  • Male
 

Citation

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Taniguchi, H., Ariga, H., Zheng, J., Ludwig, K., Mantyh, C., Pappas, T. N., & Takahashi, T. (2008). Endogenous ghrelin and 5-HT regulate interdigestive gastrointestinal contractions in conscious rats. Am J Physiol Gastrointest Liver Physiol, 295(2), G403–G411. https://doi.org/10.1152/ajpgi.90260.2008
Taniguchi, Hiroshi, Hajime Ariga, Jun Zheng, Kirk Ludwig, Christopher Mantyh, Theodore N. Pappas, and Toku Takahashi. “Endogenous ghrelin and 5-HT regulate interdigestive gastrointestinal contractions in conscious rats.Am J Physiol Gastrointest Liver Physiol 295, no. 2 (August 2008): G403–11. https://doi.org/10.1152/ajpgi.90260.2008.
Taniguchi H, Ariga H, Zheng J, Ludwig K, Mantyh C, Pappas TN, et al. Endogenous ghrelin and 5-HT regulate interdigestive gastrointestinal contractions in conscious rats. Am J Physiol Gastrointest Liver Physiol. 2008 Aug;295(2):G403–11.
Taniguchi, Hiroshi, et al. “Endogenous ghrelin and 5-HT regulate interdigestive gastrointestinal contractions in conscious rats.Am J Physiol Gastrointest Liver Physiol, vol. 295, no. 2, Aug. 2008, pp. G403–11. Pubmed, doi:10.1152/ajpgi.90260.2008.
Taniguchi H, Ariga H, Zheng J, Ludwig K, Mantyh C, Pappas TN, Takahashi T. Endogenous ghrelin and 5-HT regulate interdigestive gastrointestinal contractions in conscious rats. Am J Physiol Gastrointest Liver Physiol. 2008 Aug;295(2):G403–G411.

Published In

Am J Physiol Gastrointest Liver Physiol

DOI

ISSN

0193-1857

Publication Date

August 2008

Volume

295

Issue

2

Start / End Page

G403 / G411

Location

United States

Related Subject Headings

  • Vagotomy
  • Sulfonamides
  • Serotonin
  • Rats, Sprague-Dawley
  • Rats
  • Postprandial Period
  • Ondansetron
  • Oligopeptides
  • Muscle Contraction
  • Male