Gelator Length Precisely Tunes Supramolecular Hydrogel Stiffness and Neuronal Phenotype in 3D Culture

Jacqueline M. Godbe, Ronit Freeman, Lena F. Burbulla, Jacob Lewis, Dimitri Krainc, Samuel I. Stupp

Research output: Contribution to journalArticle

Abstract

The brain is one of the softest tissues in the body with storage moduli (G′) that range from hundreds to thousands of pascals (Pa) depending on the anatomic region. Furthermore, pathological processes such as injury, aging, and disease can cause subtle changes in the mechanical properties throughout the central nervous system. However, these changes in mechanical properties lie within an extremely narrow range of moduli, and there is great interest in understanding their effect on neuron biology. We report here the design of supramolecular hydrogels based on anionic peptide amphiphile nanofibers using oligo-l-lysines of different molecular lengths to precisely tune gel stiffness over the range of interest and found that G′ increases by 10.5 Pa for each additional lysine monomer in the oligo-l-lysine chain. We found that small changes in storage modulus on the order of 70 Pa significantly affect survival, neurite growth, and tyrosine hydroxylase-positive population in dopaminergic neurons derived from induced pluripotent stem cells. The work reported here offers a strategy to tune mechanical stiffness of hydrogels for use in three-dimensional neuronal cell cultures and transplantation matrices for neural regeneration.

Original languageEnglish
Pages (from-to)1196-1207
Number of pages12
JournalACS Biomaterials Science and Engineering
Volume6
Issue number2
DOIs
Publication statusPublished - Feb 10 2020

Keywords

  • hydrogels
  • mechanical properties
  • neurons
  • peptide amphiphiles
  • supramolecular

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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