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Instructing cells with programmable peptide DNA hybrids.

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Researchers developed a programmable molecular system to control cell behavior using peptide-DNA (P-DNA) molecules. This system precisely regulates signals, enabling dynamic control over cell adhesion, migration, and organization for neural stem cells.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Molecular Engineering

Background:

  • The native extracellular matrix (ECM) dynamically controls cell function through precisely positioned and synergistic signals.
  • Existing methods lack precise control over signal presentation and reversibility, limiting recapitulation of native ECM functions.

Purpose of the Study:

  • To engineer a programmable molecular system capable of dynamic, reversible, and precisely positioned signal presentation to control cell behavior.
  • To investigate the role of exogenous signals in regulating neural stem cell (NSC) migration and self-organization.

Main Methods:

  • Immobilization of peptide-DNA (P-DNA) molecules on surfaces via complementary DNA tethers.
  • Utilizing DNA tethers as molecular rulers to control peptide-peptide distances and signal synergy.
  • Employing orthogonal DNA handles for independent spatiotemporal control of distinct bioactive signals.

Main Results:

  • Demonstrated reversible cell adhesion and spreading over multiple cycles using the P-DNA system.
  • Showcased distance-dependent synergy between peptides, modulating cell responses.
  • Successfully triggered murine spinal cord-derived neurospheres to migrate in response to an external signal and subsequently reaggregate upon signal removal.

Conclusions:

  • The developed molecular system offers unprecedented control over signal presentation, mimicking key aspects of the native ECM.
  • This platform enables precise investigation of cell signaling dynamics and cell fate decisions.
  • Revealed that neural stem cell migration and self-organization can be reversibly controlled by exogenous signals.