Neural mechanisms of motion sickness

Area of Science:

• Neuroscience
• Pharmacology
• Gastroenterology

Background:

• Motion sickness involves complex neural pathways.
• Neurotransmitters like histamine, acetylcholine, and noradrenaline are implicated.
• Existing medications suggest specific receptor targets.

Purpose of the Study:

• To elucidate the roles of histamine, acetylcholine, and noradrenaline in motion sickness.
• To understand the mechanisms of action for antihistamines, scopolamine, and amphetamine.
• To identify specific neural pathways and receptors involved in motion sickness and emesis.

Main Methods:

• Review of neurochemical and pharmacological data.
• Analysis of neural pathways involved in motion sickness.
• Examination of receptor interactions in the emetic reflex.

Main Results:

• Histamine acts via H1-receptors in the brainstem's emetic center, independent of dopamine D2 and serotonin 5HT3 receptors.
• Antihistamines block these H1-receptors to prevent motion sickness.
• Scopolamine reduces neural mismatch signals and aids habituation.
• Amphetamine counteracts suppression of noradrenergic pathways.

Conclusions:

• Histaminergic pathways are critical for motion sickness, targeted effectively by antihistamines.
• Acetylcholine and noradrenaline systems are also modulated by motion sickness stimuli and medications.
• Understanding these neurotransmitter systems offers insights into effective motion sickness prevention.