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J Control Release. 2013 Oct 10;171(1):48-56. doi: 10.1016/j.jconrel.2013.06.021. Epub 2013 Jun 22.

PK modulation of haptenylated peptides via non-covalent antibody complexation.

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Roche Pharma Research & Early Development pRED, Large Molecule Research, Nonnenwald 2, D-82372 Penzberg, Germany.


We applied noncovalent complexes of digoxigenin (Dig) binding antibodies with digoxigeninylated peptide derivatives to modulate their pharmacokinetic properties. A peptide derivative which activates the Y2R receptor was selectively mono-digoxigeninylated by reacting a NHS-Dig derivative with an ε-amino group of lysine 2. This position tolerates modifications without destroying receptor binding and functionality of the peptide. Dig-peptide derivatives can be loaded onto Dig-binding IgGs in a simple and robust reaction, thereby generating peptide-IgG complexes in a defined two to one molar ratio. This indicates that each antibody arm becomes occupied by one haptenylated peptide. In vitro receptor binding and signaling assays showed that Dig-peptides as well as the peptide-antibody complexes retain better potency than the corresponding pegylated peptides. In vivo analyses revealed prolonged serum half-life of antibody-complexed peptides compared to unmodified peptides. Thus, complexes are of sufficient stability for PK modulation. We observed more prolonged weight reduction in a murine diet-induced obesity (DIO) model with antibody-complexed peptides compared to unmodified peptides. We conclude that antibody-hapten complexation can be applied to modulate the PK of haptenylated peptides and in consequence improve the therapeutic efficacy of therapeutic peptides.


CME; Diabetes; Dig; Digoxigenin; H-chain; L-chain; PYY; Pharmacokinetics; SEC; SPR; carboxymethyl ether; digoxigenin; heavy chain; light chain; size exclusion chromatography; surface plasmon resonance

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