Quantitative whole-body autoradiography: past, present and future

Area of Science:

• Pharmacokinetics and Drug Metabolism
• Preclinical Drug Development
• Bioanalytical Chemistry

Background:

• Most drugs act in target tissues, not plasma.
• Plasma drug concentrations do not reliably predict tissue concentrations.
• Understanding tissue distribution is crucial for new therapeutics.

Purpose of the Study:

• To evaluate the role of Quantitative Whole-Body Autoradiography (QWBA) in preclinical drug distribution studies.
• To assess the relevance of QWBA in light of modern analytical techniques.
• To re-evaluate the industry standard for tissue distribution analysis.

Main Methods:

• Quantitative Whole-Body Autoradiography (QWBA) for radiolabeled compounds.
• Analysis of drug and metabolite distribution in animal tissues.
• Assessment of tissue pharmacokinetics (PKs), penetration, accumulation, and retention.

Main Results:

• QWBA provides data on tissue drug concentrations and distribution.
• The technique offers insights into drug absorption, distribution, metabolism, and excretion (ADME).
• QWBA is the established industry standard for preclinical tissue distribution.

Conclusions:

• Re-evaluation of QWBA is timely given its 60-year history.
• Modern alternatives should be considered alongside QWBA for comprehensive tissue distribution analysis.
• Further research is needed to compare QWBA with emerging bioanalytical methods.