Apomorphine anorexia: a behavioural and neuropharmacological analysis

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• Apomorphine is known to affect feeding behavior.
• Understanding the precise mechanisms of appetite regulation is crucial for treating eating disorders.

Purpose of the Study:

• To investigate the microstructural components of apomorphine-induced anorexia.
• To explore the role of dopamine receptors in mediating these effects.

Main Methods:

• Microstructural analysis of feeding behavior in response to apomorphine.
• Administration of apomorphine to specific brain regions (ventral tegmental area, substantia nigra).
• Assessment of the effects of neuroleptics (haloperidol, thioridazine) on apomorphine's actions.

Main Results:

• Low-dose apomorphine reduced food intake by decreasing both eating rate and time.
• Neuroleptics blocked the effect of apomorphine on eating time but not eating rate.
• Apomorphine's anorectic effects in the ventral tegmental area and substantia nigra were primarily mediated by reduced eating time.

Conclusions:

• Apomorphine's effect on eating time is likely mediated by presynaptic dopamine receptors.
• The mechanism underlying apomorphine's effect on eating rate remains undetermined.
• Selective reduction in eating time is a key component of apomorphine-induced anorexia.