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Published on: February 27, 2020
Immunoaffinity purification and quantification of antibody-toxin conjugates
1Drug Targeting Laboratory, Institute of Cancer Research, Sutton, Surrey, UK.
Methods in Molecular Biology (Clifton, N.J.)
|November 15, 2012
Summary
Antibody-toxin conjugates are crucial for targeted therapies but often contain unconjugated antibodies. Current purification methods like gel permeation chromatography struggle to fully separate these essential components, impacting therapeutic efficacy.
Area of Science:
- Bioconjugation Chemistry
- Immunotoxins
- Drug Delivery Systems
Background:
- Cytotoxic antibody-toxin conjugates are developed for targeted cancer therapy.
- These conjugates are typically prepared using chemical crosslinking methods involving antibodies and ribosome-inactivating proteins (RIPs).
Purpose of the Study:
- To describe the purification of antibody-toxin conjugates prepared via chemical crosslinking.
- To highlight the limitations of current purification techniques in separating unconjugated antibodies.
Main Methods:
- Preparation of antibody-toxin conjugates using chemical crosslinking.
- Purification of conjugates using gel permeation chromatography (GPC).
Main Results:
- Gel permeation chromatography effectively removes protein aggregates, excess RIPs, and low molecular weight byproducts.
- A significant fraction of unconjugated antibody remains in the conjugate preparation after GPC.
- Size discrimination alone is insufficient for complete separation of conjugate from unconjugated antibody.
Conclusions:
- While GPC is a useful initial step, it does not fully resolve unconjugated antibodies from antibody-toxin conjugates.
- Further optimization or alternative methods are needed to achieve high purity of antibody-toxin conjugates for therapeutic applications.
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