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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Regional retinal degeneration causes blindness by damaging photoreceptor cells.
  • Restoring vision requires re-sensitizing remaining retinal neurons to light.

Purpose of the Study:

  • To develop a method for inducing near-infrared light sensitivity in retinal cells.
  • To investigate the potential for vision restoration in retinal degeneration models.

Main Methods:

  • Engineered temperature-sensitive transient receptor potential (TRP) channels were expressed in mouse retinal cones.
  • Gold nanorods were used to deliver near-infrared light, activating the TRP channels via localized heating.
  • Cellular activity was measured in response to near-infrared stimulation, and light-driven behavioral tasks were assessed.

Main Results:

  • Near-infrared stimulation successfully activated retinal cones, ganglion cell layer neurons, and cortical neurons in a mouse model.
  • Mice demonstrated the ability to perform learned light-driven behaviors after treatment.
  • The system allowed tuning of wavelength and power sensitivity by modifying nanorod length and TRP channel properties.
  • Postmortem human retinas showed cell activation upon near-infrared light exposure.

Conclusions:

  • Near-infrared light can be used to induce artificial vision in retinas with regional degeneration.
  • This approach offers a potential strategy for vision restoration in patients with conditions like retinitis pigmentosa.
  • The technology is adaptable for different light wavelengths and intensities, and shows promise for human application.