Abstract
The glycosylation pattern of chCE7, an antineuroblastoma chimeric IgG1, was engineered in Chinese hamster ovary cells with tetracycline–regulated expression of β(1,4)–N–acetylglucosaminyltransferase III (GnTIII), a glycosyltransferase catalyzing formation of bisected oligosaccharides that have been implicated in antibody–dependent cellular cytotoxicity (ADCC). Measurement of the ADCC activity of chCE7 produced at different tetracycline levels showed an optimal range of GnTIII expression for maximal chCE7 in vitro ADCC activity, and this activity correlated with the level of constant region–associated, bisected complex oligosaccharides determined by matrix–assisted laser desorption/ionization time–of–flight mass spectrometry. The new optimized variants of chCE7 exhibit substantial ADCC activity and, hence, may be useful for treatment of neuroblastoma. The strategy presented here should be applicable to optimize the ADCC activity of other therapeutic IgGs.
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Acknowledgements
This research was supported by the Swiss Priority Program in Biotechnology (SPP BioTech). We would like to thank Ilse Novak for comparing the binding of different chCE7 samples to neuroblastoma cells, Heidi Ernst for DNA sequencing, and Naoyuki Taniguchi for providing us with the rat GnTIII cDNA.
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Umaña, P., Jean–Mairet, J., Moudry, R. et al. Engineered glycoforms of an antineuroblastoma IgG1 with optimized antibody-dependent cellular cytotoxic activity. Nat Biotechnol 17, 176–180 (1999). https://doi.org/10.1038/6179
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DOI: https://doi.org/10.1038/6179
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