Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 65, Issue 9, Pages 6953-6968Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jmedchem.2c00401
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- CEA
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This article presents a bioanalytical strategy based on dual radiolabeling and ex vivo digital imaging for accurate determination of the plasma and tissue profiles of protein-drug conjugates. The strategy involves enzymatic and chemical reactions to obtain dual-labeled anti-MMP-14 Fabs conjugated to monomethyl auristatin E, allowing for simultaneous monitoring and accurate quantification of the components during circulation phase and accumulation in different organs.
In preclinical models, the development and opti-mization of protein-drug conjugates require accurate determinationof the plasma and tissue profiles of both the protein and itsconjugated drug. To this aim, we developed a bioanalytical strategybased on dual radiolabeling and ex vivo digital imaging. Bycombining enzymatic and chemical reactions, we obtainedhomogeneous dual-labeled anti-MMP-14 Fabs (antigen-bindingfragments) conjugated to monomethyl auristatin E where theprotein scaffold was labeled with carbon-14 (14C) and theconjugated drug with tritium (3H). These antibody-drugconjugates with either a noncleavable or a cleavable linker werethen evaluated in vivo. By combining liquid scintillation countingand ex vivo dual-isotope radio-imaging, it was possible not only tomonitor both components simultaneously during their circulation phase but also to quantify accurately their amount accumulatedwithin the different organs.
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