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Electric Field Directed Structural Modulation and Nanoassembly of Peptide Hydrogels.

Kalpana Kumari1, Naveen Kumar1, Vibin Ramakrishnan1,2

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Summary

An electric field can alter peptide hydrogel structure and function without changing secondary structures. This approach offers potential therapeutic benefits for neurodegenerative diseases like Alzheimer's and Parkinson's.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Biophysics

Background:

  • Peptide self-assembly is crucial for hydrogel formation and function.
  • Controlling peptide assembly is key to developing advanced biomaterials.
  • External stimuli offer non-invasive methods for modulating peptide behavior.

Purpose of the Study:

  • To investigate the effect of electric fields on peptide hydrogel self-assembly, solubility, and functional properties.
  • To explore the potential of electric fields as a tool for modulating peptide-based biomaterials.
  • To assess the therapeutic implications of electric field-induced peptide modulation.

Main Methods:

  • Design and synthesis of three heterochiral tripeptides (P1, P2, P3) capable of hydrogel formation.
  • Application of electric fields to peptide hydrogels.
  • Structural and morphological characterization using field emission-scanning electron microscopy (FE-SEM), field emission-transmission electron microscopy (FE-TEM), and atomic force microscopy (AFM).
  • Assessment of electrical conductivity and mechanical robustness of hydrogels.

Main Results:

  • Electric fields modulated supramolecular assembly at the nanoscale, altering morphology from nanofibrillar to nanoflakes, vesicles, and globular aggregates.
  • Secondary peptide structures remained unchanged, indicating specific modulation of assembly.
  • Electrical conductivity of the hydrogel was modulated by the electric field.
  • An inverse relationship was observed between peptide solubility and hydrogel mechanical robustness.

Conclusions:

  • Electric fields can non-invasively perturb and modulate peptide solubility and aggregation characteristics.
  • This method offers a promising strategy for developing therapeutic interventions for diseases characterized by peptide misfolding and aggregation, such as Alzheimer's and Parkinson's.
  • The study highlights the potential of external electric fields in designing and controlling peptide-based functional materials.