Immunogenicity of coiled-coil based drug-free macromolecular therapeutics

Biomaterials. 2014 Jul;35(22):5886-96. doi: 10.1016/j.biomaterials.2014.03.063. Epub 2014 Apr 22.


A two-component CD20 (non-internalizing) receptor crosslinking system based on the biorecognition of complementary coiled-coil forming peptides was evaluated. Exposure of B cells to Fab'-peptide1 conjugate decorates the cell surface with peptide1; further exposure of the decorated cells to P-(peptide2)x (P is the N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer backbone) results in the formation of coiled-coil heterodimers at the cell surface with concomitant induction of apoptosis. The aim of this study was to determine the potential immunogenicity of this therapeutic system that does not contain low molecular weight drugs. Enantiomeric peptides (L- and D-CCE and L- and D-CCK), HPMA copolymer-peptide conjugates, and Fab' fragment-peptide conjugates were synthesized and the immunological properties of peptide conjugates evaluated in vitro on RAW264.7 macrophages and in vivo on immunocompetent BALB/c mice. HPMA copolymer did not induce immune response in vitro and in vivo. Administration of P-peptide conjugates with strong adjuvant resulted in antibody response directed to the peptide. Fab' was responsible for macrophage activation of Fab'-peptide conjugates and a major factor in the antibody induction following i.v. administration of Fab'-conjugates. There was no substantial difference in the ability of conjugates of D-peptides and conjugates of L-peptides to induce Ab response.

Keywords: Coiled-coil peptides; Drug-free macromolecular therapeutics; Enantiomers; Fab' fragment; HPMA copolymer; Immunogenicity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acrylamides / administration & dosage
  • Acrylamides / chemistry
  • Acrylamides / immunology*
  • Amino Acid Sequence
  • Animals
  • Antibody Formation / drug effects
  • Cell Line
  • Immunoglobulin Fab Fragments / administration & dosage
  • Immunoglobulin Fab Fragments / chemistry
  • Immunoglobulin Fab Fragments / immunology*
  • Macrophages / drug effects
  • Macrophages / immunology
  • Mice
  • Mice, Inbred BALB C
  • Molecular Sequence Data
  • Peptides / administration & dosage
  • Peptides / chemistry
  • Peptides / immunology*
  • T-Lymphocytes / drug effects
  • T-Lymphocytes / immunology


  • Acrylamides
  • Immunoglobulin Fab Fragments
  • Peptides
  • N-(2-hydroxypropyl)methacrylamide