Silicon Nanowires for Intracellular Optical Interrogation with Subcellular Resolution

Area of Science:

• Biotechnology
• Cellular Electrophysiology
• Nanotechnology

Background:

• Current intracellular electrical interrogation methods face limitations in spatial resolution and technical demands.
• Substrate-bound devices restrict cellular function and experimental flexibility.

Purpose of the Study:

• To develop a novel method for subcellular electrical stimulation using freestanding silicon nanowires.
• To investigate the potential of silicon nanowires for intracellular interrogation in various cell types.

Main Methods:

• Freestanding silicon nanowires were used for photoelectric stimulation of myofibroblasts.
• Myofibroblasts were shown to internalize nanowires while maintaining viability and mitotic capability.
• Subcellular calcium fluxes were measured following nanowire stimulation.
• Nanowire-myofibroblast hybrids were co-cultured with cardiomyocytes to assess electrical coupling.
• The methodology was extended to study neuron-glia interactions.

Main Results:

• Silicon nanowires enabled photoelectric stimulation with subcellular resolution in myofibroblasts.
• Internalized nanowires did not impede myofibroblast viability or mitosis.
• Stimulation of intracellular nanowires induced localized calcium fluxes.
• Nanowire-myofibroblast hybrids electrically coupled with cardiomyocytes, modulating cardiomyocyte activation rates.
• The technique was successfully applied to investigate neuron-glia signaling.

Conclusions:

• Freestanding silicon nanowires offer a powerful tool for precise intracellular electrical interrogation and stimulation.
• This technology facilitates the study of cellular electrophysiology and intercellular communication at the subcellular level.
• The method holds promise for advancing research in cell biology, neuroscience, and regenerative medicine.