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Amphetamine-induced anorexia: analysis with hypothalamic lesions and knife cuts
Pharmacology, Biochemistry, and Behavior
|April 1, 1986
Summary
This study shows the midlateral perifornical hypothalamus (PFH) is key for amphetamine (AMPH)-induced anorexia. Specific ascending fibers in the hypothalamus mediate this drug
Area of Science:
- Neuroscience
- Behavioral Neuroscience
Background:
- Amphetamine (AMPH) is known to suppress feeding behavior.
- The precise neural circuits mediating AMPH-induced anorexia are not fully understood.
Purpose of the Study:
- To investigate the role of the midlateral perifornical region of the hypothalamus (PFH) in AMPH-induced anorexia.
- To determine the pathway of ascending fibers involved in this anorectic effect.
Main Methods:
- Electrolytic lesions and wire-knife cuts were used to target specific hypothalamic regions in rats.
- The effects of intraperitoneal AMPH administration on feeding behavior were assessed after lesioning.
Main Results:
- Destruction of the PFH region significantly attenuated AMPH-induced anorexia.
- Lesions in adjacent hypothalamic areas did not affect AMPH's anorectic properties.
- Midlateral cuts in the caudal hypothalamus also reduced AMPH anorexia, disrupting AMPH's effect even when directly injected into the PFH.
Conclusions:
- The PFH region is essential for the anorectic effects of amphetamine.
- Ascending catecholamine fibers mediating AMPH anorexia travel through the midlateral hypothalamus.