The Dana-Farber Targeted Protein Degradation Webinar Series discusses new discoveries and modalities in protein degradation.
In this webinar, Senior Research Scientist, Dr. Danette Daniels, focuses primarily on proteolysis-targeting chimeras, or PROTACs. A variety of topics are covered including the design, potency, and efficacy of PROTACs in targeted protein degradation. Watch the video below to learn more about how PROTACs are shifting perspectives through fascinating research and discoveries in targeted protein degradation.
Learn more about targeted protein degradation and PROTACS here.
The first small-molecule kinase inhibitor approved as a cancer therapeutic, imatinib mesylate (Gleevec® treatment), has been amazingly successful. However, a thorough understanding of its molecular mechanism of action (MMOA) was not truly obtained until more than ten years after the molecule had been identified.
Understanding the MMOA for a small-molecule inhibitor can play a major role in optimizing a drug’s development. The way a drug actually works–the kinetics of binding to the target molecule and how it competes with endogenous substrates of that target–ultimately determines whether or not a a candidate therapeutic can be useful in the clinic. Drugs that fail late in development are extremely costly.
Drug research and discovery for neglected tropical diseases suffer from a lack of a large commercial market to absorb the costs of late-stage drug development failures. It becomes very important to know as much as possible, simply and quickly, about MMOA for candidate molecules for these diseases that are devastating to large populations.
Therapeutic monoclonal antibodies (mAbs) represent the majority of therapeutics biologics now on the market, with more than 20 mAbs approved as drugs (1–3). During preclinical development of therapeutic antibodies, multiple variants of each antibody are assessed for pharmacokinetic (PK) characteristics across model systems such as rodents, beagles and primates. Ligand-binding assays (LBA) are the standard technology used to perform the PK studies for mAb candidates (4). Ligand-binding assays (LBAs) are methods used to detect and measure a macromolecular interaction between a ligand and a binding molecule. In LBAs, a therapeutic monoclonal antibody is considered to be the ligand, or analyte of interest, while the binding molecule is usually a target protein.
LBAs have certain well-documented limitations (5). Specific assay reagents are often not available early in a program. Interferences from endogenous proteins, antidrug antibodies, and soluble target ligands are potential complicating factors.
Liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS)-based methods represent a viable and complementary addition to LBA for mAb quantification in biological matrixes. LC–MS/MS provides specificity, sensitivity, and multiplexing capability.
A recent reference (6) illustrates an automated method to perform LC–MS/MS-based quantitation, with IgG1 conserved peptides, a heavy isotope labeled mAb internal standard,and anti-human Fc enrichment. The method was applied to the pharmacokinetic study of a mAb dosed in cynomolgus monkey, and the results were compared with the immunoassay data. The interesting finding of the difference between ELISA and LC–MRM-MS data indicated that those two methods can provide complementary information regarding the drug’s PK profile.
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