Researchers have developed a new technology that enhances the ability to communicate with neural cells using light, an advantage that could lead to new therapies that harness the potential of the human body’s own cells.
The innovation by a team led by researchers at Carnegie Mellon University is significant for our understanding of cell interactions.
Tzahi Cohen-Karni, associate professor of biomedical engineering and materials science and engineering, led the team that synthesised three-dimensional fuzzy graphene on a nanowire template, and has created a superior material for photothermally stimulating cells.
Nanowire-Mesh-templated three-dimensional (3D) fuzzy graphene (NT-3DFG) enables remote optical stimulation without need for genetic modification. It uses orders of magnitude less energy than available materials, preventing cellular stress.
Cohen-Karni’s lab used graphene, which is cheap and biocompatible, to develop a technique of synthesizing the material in 3D topologies, calling it “fuzzy” graphene. The lab has created a 3D structure with broadband optical absorption and unparalleled photothermal efficiency.
These properties make it ideal for cellular electrophysiology modulation using light through the optocapacitive effect. The optocapacitive effect alters the cell membrane capacitance due to rapidly applied light pulses. NT-3DFG can be readily made in suspension, allowing the study of cell signaling within and between both 2D cell systems and 3D, like human cell-based organoids.
Apart from understanding how cells signal and interact with each other, these systems also has great potential for the development of new, therapeutic interventions. Exploration into these opportunities, however, has been limited by the risk of cellular stress that existing optical remote-control technologies present. The use of NT-3DFG eliminates this risk by using significantly less energy, on a scale of 1-2 orders of magnitude less. Its biocompatible surface is easy to modify chemically, making it versatile for use with different cell types and environments. Using NT-3DFG, photothermal stimulation treatments could be developed for motor recruitment to induce muscle activation or could direct tissue development in an organoid system.
The Nanostructures created using NT-3DFG may have a major impact on the future of human biology and medicine.
"This is an outstanding collaborative work of experts from multiple fields, including neuroscience through Pitt and UChicago, and photonics and materials science through UNC and CMU," said Cohen-Karni. "The developed technology will allow us to interact with either engineered tissues or with nerve or muscle tissue in vivo. This will allow us to control and affect tissue functionality using light remotely with high precision and low needed energies."
Additional contributions to the project were made by Maysam Chamanzar, assistant professor of electrical and computer engineering. His team's core expertise in photonics and neurotechnologies assisted in developing the much-needed tools to allow both the characterisation of the unique hybrid-nanomaterials, and in stimulating the cells while optically recording their activity.
"The broadband absorption of these 3D nanomaterials enabled us to use light at wavelengths that can penetrate deep into the tissue to remotely excite nerve cells. This method can be used in a whole gamut of applications, from designing non-invasive therapeutics to basic scientific studies," said Chamanzar.
