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Variability in biological activity measurements reported in the drug discovery literature

Molecular Design

In the Compatibility Issues section the authors state: Looking beyond laboratory-to-laboratory variability of assays that are nominally the same, there are numerous reasons why literature results for different assays measured against the same “target” may not be comparable.

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On quality criteria for covalent and degrader probes

Molecular Design

Covalent bond formation between ligands and targets is a drug design tactic for exploiting molecular recognition elements in targets that are difficult to make beneficial contacts with. Carefully designed biochemical assays used in determining IC50 values can be well-suited as surrogates for k.inact/K.i measurements. (

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Article FDA Thank You Draft guidance on potency assays for CGT products garners extensive stakeholder input

Agency IQ

For example, in describing how potency should be demonstrated for CGT products, the 2011 guidance simply stated that potency for gene therapy products is derived from “at least two biological activities for its potency: the ability to transfer a genetic sequence to a cell; and the biological effect of the expressed genetic sequence.”