Remote Patterning of Transgene Expression Using Near Infrared-Responsive Plasmonic Hydrogels.

Area of Science:

• Biotechnology
• Biomaterials Science
• Gene Therapy

Background:

• Noninvasive remote control of gene expression is crucial for therapeutic applications.
• Near-infrared (NIR) light offers a suitable energy source for precise spatial control.
• Gold nanoparticles (AuNPs) can be functionalized for NIR light absorption within the tissue optical window (TOW).

Purpose of the Study:

• To develop a biocompatible hydrogel system for spatiotemporal control of gene expression using NIR light.
• To integrate AuNPs and heat-inducible gene switches within a fibrin-based hydrogel for remote gene regulation.
• To demonstrate the feasibility of NIR-triggered localized transgene expression for therapeutic biomolecule delivery.

Main Methods:

• Fabrication of fibrin-based hydrogels incorporating gold nanoparticles tailored for NIR absorption.
• Loading hydrogels with cells engineered to express heat-inducible gene switches responsive to small-molecule regulators (SMRs).
• Irradiation of plasmonic cell constructs with NIR lasers to induce localized heating and transgene expression.

Main Results:

• NIR laser irradiation of plasmonic cell constructs resulted in localized heat generation.
• Spatially restricted patterns of transgene expression were achieved, precisely matching illuminated hydrogel areas.
• The system demonstrated reliable and safe control over the spatiotemporal availability of therapeutic biomolecules.

Conclusions:

• NIR-responsive hydrogels incorporating gold nanoparticles offer a promising platform for noninvasive, spatiotemporal control of gene expression.
• This technology has significant potential for therapeutic applications in various clinical scenarios, including cancer and tissue engineering.
• The combination of NIR light, plasmonic nanoparticles, and engineered cells provides a versatile tool for precise control of biomolecule release in target tissues.