Two novel agents affecting eating through an action on monoaminergic systems

Area of Science:

• Pharmacology
• Neuroscience
• Drug Discovery

Background:

• Newly synthesized anorectic agents CM 57373 and CM 57493 were investigated for their effects on food intake.
• Understanding the mechanisms of novel appetite suppressants is crucial for developing new obesity treatments.

Purpose of the Study:

• To characterize the pharmacological effects and mechanisms of action of CM 57373 and CM 57493.
• To determine the neurotransmitter systems involved in the anorectic activity of these compounds.

Main Methods:

• Dose-dependent food intake studies in rats.
• Behavioral observation for stimulant effects.
• Receptor antagonist studies (serotonergic, noradrenergic, dopaminergic).
• Cross-tolerance experiments with fenfluramine.
• In vitro and in vivo biochemical assays.

Main Results:

• Both CM 57373 and CM 57493 dose-dependently decreased food intake in rats without causing stimulant effects.
• CM 57373's anorectic effect was partially mediated by the serotonergic system.
• CM 57493's mechanism involved both serotonergic and beta-noradrenergic systems, with cross-tolerance to fenfluramine.
• Biochemical studies confirmed central serotonergic mechanisms for both agents.

Conclusions:

• CM 57373 acts as a serotonin releaser and reuptake inhibitor, primarily affecting a functional serotonin pool.
• CM 57493 interacts with postsynaptic serotonin receptors and involves the beta-noradrenergic system.
• These findings highlight distinct yet overlapping mechanisms for novel anorectic agents, offering potential for targeted therapeutic development.