Abstract
Purpose
Determine the effect of minute quantities of sub-visible aggregates on the in vitro immunogenicity of clinically relevant protein therapeutics.
Methods
Monoclonal chimeric (rituximab) and humanized (trastuzumab) antibodies were subjected to fine-tuned stress conditions to achieve low levels (<3% of total protein) of sub-visible aggregates. The effect of stimulating human dendritic cells (DC) and CD4+ T cells with the aggregates was measured in vitro using cytokine secretion, proliferation and confocal microscopy.
Results
Due to its intrinsic high clinical immunogenicity, aggregation of rituximab had minimal effects on DC activation and T cell responses compared to monomeric rituximab. However, in the case of trastuzumab (low clinical immunogenicity) small quantities of aggregates led to potent CD4+ T cell proliferation as a result of strong cytokine and co-stimulatory signals derived from DC. Consistent with this, confocal studies showed that stir-stressed rituximab was rapidly internalised and associated with late endosomes of DC.
Conclusions
These data link minute amounts of aggregates with activation of the innate immune response, involving DC, resulting in T cell activation. Thus, when protein therapeutics with little or no clinical immunogenicity, such as trastuzumab, contain minute amounts of sub-visible aggregates, they are associated with significantly increased potential risk of clinical immunogenicity.
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Abbreviations
- ADA:
-
Anti-drug antibody
- BCR:
-
B cell receptor
- CBA:
-
Cytometric bead array
- DC:
-
Dendritic cell
- DLS:
-
Dynamic light scattering
- mAbs:
-
Monocolonal antibodies
- MHC:
-
Major histocompatibility complex
- MoDC:
-
Monocyte derived dendritic cell
- Tfh:
-
Follicular helper T cell
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Ahmadi, M., Bryson, C.J., Cloake, E.A. et al. Small Amounts of Sub-Visible Aggregates Enhance the Immunogenic Potential of Monoclonal Antibody Therapeutics. Pharm Res 32, 1383–1394 (2015). https://doi.org/10.1007/s11095-014-1541-x
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DOI: https://doi.org/10.1007/s11095-014-1541-x