The predictive validity of the rat self-administration model for abuse liability

Area of Science:

• Pharmacology
• Neuroscience
• Drug Abuse Research

Background:

• The self-administration model is crucial for preclinical assessment of drug reinforcing properties.
• Rats are frequently used in these studies, necessitating an understanding of their predictive validity for human abuse liability.

Purpose of the Study:

• To review the predictive validity of the rat self-administration model for assessing drug abuse liability.
• To compare rodent and non-human primate (NHP) self-administration data to understand species-specific influences.

Main Methods:

• Systematic review of 71 drugs evaluated in rat self-administration studies.
• Comparison of rat self-administration findings with clinical indicators (subjective effects, DEA scheduling).
• Comparative analysis of rodent and NHP self-administration data.

Main Results:

• High concordance was found between rat self-administration data and clinical indicators of abuse liability.
• In cases of discrepancy, rat data generally aligned with NHP self-administration findings.
• Factors like sex, strain, food deprivation, and study design influence self-administration outcomes.

Conclusions:

• The rat self-administration model demonstrates significant predictive validity for human drug abuse liability.
• NHP data supports rat findings when discrepancies with clinical data arise.
• Optimizing study design and considering genetic factors can further enhance the model's predictive power.