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Cell receptor assays.

K C Zoon1, D L zur Nedden, R W Kozak

  • 1Laboratory of Immunology, Center for Biologics Evaluation and Research, Bethesda, MD 20892.

Journal of Pharmaceutical and Biomedical Analysis
|January 1, 1989
PubMed
Summary
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Cell receptor assays measure the initial drug-receptor interaction, a crucial step in determining drug potency. However, binding does not guarantee biological activity, necessitating comprehensive chemical and biological evaluations.

Area of Science:

  • Pharmacology
  • Biotechnology
  • Assay Development

Background:

  • Quantifying drugs/biologics involves various methods like in vivo/in vitro bioassays, immunoassays, and receptor assays.
  • Cell receptor assays assess the critical initial interaction between a drug/biologic and its specific cellular receptor.

Purpose of the Study:

  • To outline key considerations for developing robust cell receptor assays.
  • To highlight the importance of evaluating the correlation between receptor binding and actual biological activity.

Main Methods:

  • Discusses critical factors in cell receptor assay development: reference standards, biologic characterization, receptor source, methodology (separation techniques, accuracy, reproducibility), ligand specificity.
  • Emphasizes the need for careful evaluation of both chemical and biological aspects.

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Main Results:

  • Cell receptor binding is only the first step; subsequent cellular events are required for a biological effect.
  • Chemically modified drugs may bind receptors without eliciting activity, indicating potential limitations of receptor assays alone.

Conclusions:

  • Cell receptor assays are valuable for assessing initial drug-receptor interactions but require validation.
  • Thorough chemical and biological assessment is essential before accepting cell receptor assays as a definitive measure of drug potency.