Abstract
A critical component of antibody-drug conjugate (ADC) development is identification or verification of the active released entity upon cellular uptake and exposure to lysosomal enzymes. Coupled with LC/MS, commercial human lysosomal preparations can be used as an in vitro tool to explore the release characteristics of new ADCs, and gain information on potential metabolic or chemical liabilities of new payload structures. A general method for approaching this is described for cathepsin B-cleavable as well as non-cleavable ADCs, and opportunities for tailoring the method to specific cases are indicated.
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