Journal of Gastroenterology

, Volume 47, Issue 4, pp 404–411 | Cite as

Endogenous orexin-A in the brain mediates 2-deoxy-d-glucose-induced stimulation of gastric motility in freely moving conscious rats

  • Tsukasa Nozu
  • Yoshihiro Tuchiya
  • Shima Kumei
  • Kaoru Takakusaki
  • Koji Ataka
  • Mineko Fujimiya
  • Toshikatsu Okumura
Original Article—Alimentary Tract

Abstract

Background

Increasing evidence has indicated that brain orexin plays a vital role in the regulation of gastrointestinal (GI) physiology such as gastric acid secretion and GI motility. The aim of this study was to elucidate the effects and mechanisms of orexin on gastric motility in non-fasted rats.

Methods

In this study, we recorded intraluminal gastric pressure waves in freely moving conscious rats with a manometric catheter located in the antrum. We assessed the area under the manometric trace as the motor index (MI), and compared its values for 1 h before and after drug administration.

Results

Intracisternal (ic) injection of orexin-A (10 μg) significantly increased the MI, but intraperitoneal (ip) injection did not have any effect. Pretreatment of ip injection of atropine significantly blocked the orexin-A-induced stimulation of gastric motility. Intravenous injection of 2-deoxy-d-glucose (2-DG, 200 mg/kg), a central vagal stimulant, significantly increased the MI. The ic injection of SB-334687 (40 μg), a selective orexin-A antagonist, did not modify the basal MI, but this antagonist significantly suppressed the stimulant action of 2-DG.

Conclusions

These results suggest that endogenous orexin-A in the brain is involved in the vagal-dependent stimulation of gastric contractions.

Keywords

Orexin Brain Stomach Motility Intraluminal pressure wave 

Notes

Acknowledgments

This work was supported in part by Grants-in-Aid from the Ministry of Education, Science, Sports and Culture of Japan [C-23590252 (TN), and C-22590753 (TO)].

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer 2011

Authors and Affiliations

  • Tsukasa Nozu
    • 1
  • Yoshihiro Tuchiya
    • 2
  • Shima Kumei
    • 2
  • Kaoru Takakusaki
    • 3
  • Koji Ataka
    • 4
  • Mineko Fujimiya
    • 4
  • Toshikatsu Okumura
    • 2
  1. 1.Department of Regional Medicine and EducationAsahikawa Medical UniversityAsahikawaJapan
  2. 2.Department of General MedicineAsahikawa Medical UniversityAsahikawaJapan
  3. 3.Research Center for Brain Function and Medical EngineeringAsahikawa Medical UniversityAsahikawaJapan
  4. 4.Department of AnatomySapporo Medical University School of MedicineSapporoJapan

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