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Orexin-A expression in human peripheral tissues.

Masao Nakabayashi1, Takashi Suzuki, Kazuhiro Takahashi

  • 1Department of Pathology, Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, 980-8575 Sendai, Japan.

Molecular and Cellular Endocrinology
|August 2, 2003
PubMed
Summary

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This study investigated the distribution of orexin-A, a neuropeptide, in human tissues. Orexin-A was found in various peripheral organs, suggesting its potential role beyond the brain.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Gastroenterology

Background:

  • Orexin-A is a neuropeptide primarily known for regulating feeding and sleep in the brain.
  • Its distribution and function in peripheral human tissues remain largely uncharacterized.

Purpose of the Study:

  • To investigate the systemic distribution of orexin-A in various human peripheral tissues.
  • To explore the potential peripheral roles of orexin-A.

Main Methods:

  • Immunohistochemistry was used to detect orexin-A immunoreactivity in human tissues.
  • Double immunostaining was performed to co-localize orexin-A with specific cell markers (e.g., insulin).
  • mRNA expression analysis (prepro-orexin) was conducted in various organs.

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Main Results:

  • Orexin-A immunoreactivity was identified in the thoracic sympathetic trunk, gastrointestinal tract (myenteric plexuses, endocrine cells), pancreatic islet cells, and placental cells.
  • Orexin-A was present in the gastrointestinal tract from 26 gestational weeks to birth.
  • A majority of insulin-positive pancreatic cells co-expressed orexin-A.
  • Prepro-orexin mRNA was detected in the kidney, adrenal gland, pancreas, placenta, stomach, ileum, colon, and colorectal epithelial cells.

Conclusions:

  • Orexin-A is produced in diverse human peripheral tissues, including the gastrointestinal tract, pancreas, and placenta.
  • These findings suggest that orexin-A may exert important functions in various peripheral organs beyond its established roles in the central nervous system.