Intracisternal sauvagine is more potent than corticotropin-releasing factor to decrease gastric vagal efferent...

Area of Science:

• Neuroendocrinology
• Gastrointestinal Physiology
• Autonomic Nervous System Function

Background:

• The role of corticotropin-releasing factor (CRF) in regulating gastrointestinal functions is increasingly recognized.
• CRF and related peptides like sauvagine are known to influence autonomic pathways.
• Gastric vagal efferent activity is a key regulator of gastric function.

Purpose of the Study:

• To investigate the effect of intracisternal administration of CRF and sauvagine on gastric vagal efferent multiunit discharge (GVED) in rats.
• To determine the potency of sauvagine relative to CRF in modulating GVED.
• To examine the role of endogenous CRF in maintaining basal GVED.

Main Methods:

• Rats anesthetized with urethane underwent intracisternal injections of CRF, sauvagine, or vehicle.
• Gastric vagal efferent multiunit discharge (GVED) was recorded before and after injections.
• A specific CRF antagonist was used to block CRF-induced effects and assess endogenous CRF tone.

Main Results:

• Both CRF and sauvagine dose-dependently decreased GVED.
• Sauvagine was found to be more potent than CRF in inhibiting GVED.
• CRF antagonist administration increased GVED and blocked CRF-induced inhibition, suggesting endogenous CRF exerts an inhibitory tone.

Conclusions:

• CRF and sauvagine inhibit GVED via CRF receptors.
• Sauvagine exhibits greater potency than CRF in this inhibitory action.
• Endogenous CRF contributes to the regulation of basal GVED in anesthetized rats.