pH-Responsive Charge-Conversion Progelator Peptides

Andrea S. Carlini*, Wonmin Choi, Naneki C. McCallum, Nathan C. Gianneschi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A simple strategy for generating stimuli-responsive peptide-based hydrogels via charge-conversion of a self-assembling peptide (SAP) is described. These materials are formulated as soluble, polyanionic peptides, containing maleic acid, citraconic acid, or dimethylmaleic acid amide masking groups on each lysine residue, which do not form assemblies, but instead flow easily through high gauge needles and catheters. Acid-induced mask hydrolysis renews the zwitterionic nature of the peptides with concomitant and rapid self-assembly via β-sheet formation into rehealable hydrogels. The use of different masks enables one to tune pH responsiveness and assembly kinetics. In anticipation of their potential for in vivo hydrogel delivery and use, progelators exhibit hemocompatibility in whole human blood, and their peptide components are shown to be noncytotoxic. Finally, demonstration of stimuli-induced self-assembly for dye sequestration suggests a simple, non-covalent strategy for small molecule encapsulation in a degradable scaffold. In summary, this simple, scalable masking strategy allows for preparation of responsive, dynamic self-assembling biomaterials. This work sets the stage for implementing biodegradable therapeutic hydrogels that assemble in response to physiological, disease-relevant states of acidosis.

Original languageEnglish (US)
Article number2007733
JournalAdvanced Functional Materials
Volume31
Issue number13
DOIs
StatePublished - Mar 24 2021

Keywords

  • catheter
  • charge-conversion
  • hemocompatible
  • hydrogels
  • pH-responsive
  • peptides
  • self-assembly

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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