Insight on the Impact of the Reduction Step on the Site‐Directed Conjugation of an Anti‐HER2 Cysteine‐Engineered Antibody

Autor: Ramón Román, Jordi J. Cairó, Sarah Cianférani, Antoni Casablancas, Mercè Farràs, Joan Miret, Marc Camps, Stéphane Erb
Přispěvatelé: Universitat Autònoma de Barcelona (UAB), Farmhispania SA, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: ChemistrySelect
ChemistrySelect, Wiley, 2020, 5 (11), pp.3187-3190. ⟨10.1002/slct.201903913⟩
ISSN: 2365-6549
Popis: International audience; Cysteine‐based conjugation is one of the main antibody conjugation strategies for generating both heterogeneous and homogeneous Antibody Drug Conjugates (ADCs), being the reduction of the antibody a crucial step in these processes. In this work we have analysed the reduction conditions for the site‐directed conjugation of an anti‐HER2 (Human Epidermal Receptor 2) Trastuzumab_cys114 antibody to the cytotoxic drug vcMMAE (valine‐citrulline monomethyl auristatin E), with an aimed average DAR (Drug‐Antibody Ratio) of 2. Initial reduction was found to have a direct impact on the availability of free thiols for the conjugation: increasing of reducing agent concentration (until a molar excess of 50x) in the reduction step resulted in a lower proportion of naked antibody in the final ADC product and allowed us to obtain an ADC close to the DAR of interest. This work shows that reduction conditions must be adjusted in order to obtain the desired homogeneous ADC product.
Databáze: OpenAIRE
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