Do enteric neurons make hypocretin?

Area of Science:

• Neuroscience
• Gastroenterology

Background:

• Hypocretins (orexins) are crucial for wakefulness and are deficient in narcolepsy.
• Hypocretin neurons in the hypothalamus are targeted in narcolepsy, potentially via autoimmunity.
• Previous research suggested the presence of hypocretin neurons in the enteric nervous system.

Purpose of the Study:

• To investigate the presence and potential loss of enteric hypocretin neurons in narcolepsy.
• To determine if the enteric nervous system is a potential autoimmune target in narcolepsy.

Main Methods:

• Utilized multiple techniques including whole mounts and sectioned tissue.
• Employed pre-treatment of mice with colchicine.
• Tested various primary antisera for hypocretin detection.

Main Results:

• Failed to identify hypocretin-producing cells in enteric nervous tissue from mice.
• Could not detect hypocretin-producing cells in enteric nervous tissue from normal human subjects.
• The study did not find evidence of enteric hypocretin neurons.

Conclusions:

• The existence of functional hypocretin neurons in the enteric nervous system is questionable.
• Enteric hypocretin neurons are unlikely to be involved in the autoimmune pathology of narcolepsy.