Investigating Hapten Clustering as a Strategy to Enhance Vaccines against Drugs of Abuse
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Abstract
Vaccines for drugs of abuse have yet to achieve full clinical relevance, largely due to poor/inconsistent immune responses in patients. The use of multivalent scaffolding as a means to tailor drug-hapten density and clustering was examined in the context of drug-immune response modulation. A modular trivalent hapten containing a diglycine spacer, triAM1(Gly)2, was synthesized and shown to elicit anti-nicotine antibodies at equivalent affinity and concentration to the monovalent AM1 analog, despite in this instance having a lower effective hapten density. Augmenting this data, the corresponding monovalent hapten AM1(Gly)2 resulted in enhanced antibody affinity and concentration. Drug-hapten clustering represents a new vaccine paradigm, and, while examined only in the context of nicotine, it should be readily translatable to other drugs of abuse.
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