title: Immune responses to coiled coil supramolecular biomaterials.
abstract: Self-assembly has been increasingly utilized in recent years to create peptide-based biomaterials for 3D cell culture, tissue engineering, and regenerative medicine, but the molecular determinants of these materials' immunogenicity have remained largely unexplored. In this study, a set of molecules that self-assembled through coiled coil oligomerization was designed and synthesized, and immune responses against them were investigated in mice. Experimental groups spanned a range of oligomerization behaviors and included a peptide from the coiled coil region of mouse fibrin that did not form supramolecular structures, an engineered version of this peptide that formed coiled coil bundles, and a peptide-PEG-peptide triblock bioconjugate that formed coiled coil multimers and supramolecular aggregates. In mice, the native peptide and engineered peptide did not produce any detectable antibody response, and none of the materials elicited detectable peptide-specific T cell responses, as evidenced by the absence of IL-2 and interferon-gamma in cultures of peptide-challenged splenocytes or draining lymph node cells. However, specific antibody responses were elevated in mice injected with the multimerizing peptide-PEG-peptide. Minimal changes in secondary structure were observed between the engineered peptide and the triblock peptide-PEG-peptide, making it possible that the triblock's multimerization was responsible for this antibody response.
authors: Department of Surgery, University of Chicago, 5841 S. Maryland Ave, Chicago, IL 60637, USA.
authors: Jai S
authors: JS
authors: Rudra
authors: Pulak K
authors: PK
authors: Tripathi
authors: David A
authors: DA
authors: Hildeman
authors: Jangwook P
authors: JP
authors: Jung
authors: Joel H
authors: JH
authors: Collier
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000917:Antibody Formation; D001672:Biocompatible Materials / Q000008:administration & dosage / Q000737:chemistry* / Q000378:metabolism; D005337:Fibrin / Q000737:chemistry / Q000276:immunology; D007114:Immunization; D008198:Lymph Nodes / Q000166:cytology; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D010455:Peptides / Q000008:administration & dosage / Q000138:chemical synthesis / Q000737:chemistry* / Q000276:immunology*; D011092:Polyethylene Glycols / Q000008:administration & dosage / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism; D011108:Polymers / Q000008:administration & dosage / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D017510:Protein Folding; D017433:Protein Structure, Secondary; D013154:Spleen / Q000166:cytology
chemical_list: D001672:Biocompatible Materials; D010455:Peptides; D011108:Polymers; D011092:Polyethylene Glycols; D005337:Fibrin