研究目的
To present a roadmap for the development and translation of monoclonal antibody tracers into cGMP-compliant drug products, specifically for cetuximab-800CW and trastuzumab-800CW, to facilitate their use in clinical trials for optical molecular imaging.
研究成果
The roadmap successfully standardized the development and cGMP translation of cetuximab-800CW and trastuzumab-800CW, resulting in stable tracers suitable for clinical use. This approach can be applied to other antibody-based tracers to improve their translation to human applications.
研究不足
The approach may be inefficient for screening large numbers of additives and excipients, and it is based on European Pharmacopeia requirements, which may differ in other regions. Additionally, for new antibodies not yet marketed, compatible excipients may not be fully known, making buffer discovery more challenging.
1:Experimental Design and Method Selection:
The study involved optimizing the production process for cetuximab-800CW and trastuzumab-800CW, focusing on dye-to-protein label ratio and formulation buffer. Methods included SE-HPLC, pH measurement, osmolality, visual inspection, and sterility testing as per European Pharmacopeia and cGMP guidelines.
2:Sample Selection and Data Sources:
Samples were formulations of cetuximab-800CW and trastuzumab-800CW, with specific buffers and dye-to-protein ratios. Data were collected from stability studies.
3:List of Experimental Equipment and Materials:
Equipment included SE-HPLC system (Hitachi Chromaster series), ELISA plates, pH meters, osmometers, and sterility testing kits. Materials included cetuximab (Erbitux), trastuzumab (Herceptin), IRDye 800CW, various buffers, and excipients.
4:Experimental Procedures and Operational Workflow:
Conjugation and purification of antibodies with IRDye 800CW, formulation studies with different buffers, full-scale stability studies under cGMP conditions, and quality control analyses.
5:Data Analysis Methods:
Data were analyzed using SE-HPLC for monomer concentration and impurities, ELISA for target affinity, and statistical methods with GraphPad Prism software.
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Chromaster pump
5110
Hitachi
Used in the SE-HPLC system for pumping the mobile phase.
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Chromaster injector
5210
Hitachi
Used in the SE-HPLC system for sample injection.
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Chromaster Diode-array detector
5430
Hitachi
Used in the SE-HPLC system for detecting absorption from 200-900nm.
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IRDye 800CW
cGMP grade
LI-COR bioscience
Fluorescent dye conjugated to antibodies for optical imaging.
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Biosep SEC S3000 column
300x7.2mm
Phenomenex
Used in the SE-HPLC system for size-exclusion chromatography.
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Millex GV filter
0.22 μm
Merck Millipore
Used for bacteria-retaining filtration of the tracer solutions.
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Cetuximab
Erbitux
Merck KGaA
Monoclonal antibody used as the base for tracer conjugation.
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Trastuzumab
Herceptin
Roche Pharma AG
Monoclonal antibody used as the base for tracer conjugation.
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