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MedTech Outlook | Friday, September 01, 2023
Photobiomodulation therapy offers a promising avenue for cognitive rehabilitation. Integrating nanomaterials further enhances the precision and effectiveness of photobiomodulation, providing new possibilities for targeted treatments.
FREMONT, CA: Cognitive function is an important ability of the brain, but cognitive dysfunction can easily develop once the brain is injured in various neuropathological conditions or diseases. Photobiomodulation treatment is a noninvasive physical therapy slowly gaining traction in neuroscience. Transcranialphotobiomodulation is a typical method for controlling neuronal activity in the superficial cortex. Advanced photobiomodulation methods, in combination with photosensitive nanoparticles, have been created to trigger deeper brain activity.
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Because of the intricacy of cranial anatomy, noninvasive procedures have distinct benefits in treating brain illnesses. Indeed, transcranial electrical stimulation (TES) and transcranial magnetic stimulation (TMS) have been employed in therapeutic settings with significant curative results. However, these procedures continue to have poor therapeutic efficiency due to a lack of tailored therapy for specific disorders and are not without consequences, such as epilepsy. Light therapy is emerging as a novel alternative treatment to minimize negative outcomes.
Photobiomodulation uses light photon energy to regulate the physiological activities of people or animals. A near-infrared (NIR) laser that can successfully penetrate organs, including the brain, has been researched for this use. Because of the brain's complicated structure and the wide range of illness states, an NIR laser with varying wavelengths, energy densities, and irradiance was chosen for usage. The frequency and irradiation period were changed at the experimental level to get a better target on neural activity of the specified brain area and to acquire the maximum advantages.
The energy provided by photon absorption by cellular mitochondria modifies organisms' microenvironments, allowing them to treat sickness or disease situations. The photothermal conversion effect induced by photothermalnanomaterials provides photobiomodulation with precise and efficient characteristics.
Photobiomodulation was formerly referred to as low-level light treatment. This therapy generates ultraviolet, visible, and infrared light using nonionizing light sources such as lasers, light-emitting diodes (LEDs), or broadband light. The light scattering effect of the NIR laser is modest, allowing it to penetrate deeper into live tissue while causing less harm to the organism. Because of these benefits, NIR-based photobiomodulation has been widely used to treat pain and inflammation, alter immunological function, improve wound healing, and regenerate tissue.
Transcranialphotobiomodulation is a form of photobiomodulation in which light passes through the skull and into the brain matter to have an effect. Light flows through various layers, including the scalp, periosteum, skull, and meninges, inducing neurobiological changes. Transcranialphotobiomodulation improves executive performance, memory, attention, and other cognitive abilities in cognition-related disorders, indicating that it is a potential therapy for the neurorehabilitation of cognitive function.
Intranasal photobiomodulation is an alternative to transcranialphotobiomodulation because it overcomes some of the limitations of transcranialphotobiomodulation and provides effective irradiation into specific brain regions such as the ventral frontal lobe, ventral preorbital cortex, and hippocampus. Intranasal photobiomodulation enhances brain function because photothermal conversion changes hemodynamic rheology, blood viscosity, and coagulation function in areas where light radiation has been administered. It has been observed that repeated intranasal photobiomodulation may improve cognitive performance.
Another sophisticated sort of photobiomodulation is the incorporation of nanomaterials. The advantage of nanomaterial-integrated photobiomodulation is improved precision in treating disorders affecting brain regions. Combining nanodrug-carrying particles with a NIR laser represents a significant step forward in photobiomodulation research. The localized and timed release of nano drugs in the brain can be obtained by combining the tailored drug-carrying capabilities and biocompatibility of nanomaterials with the optical stimulation of a NIR laser. This is extremely useful in viewing the particular brain area/region that is being targeted and protects healthy brain tissue from further harm. As a result, nanomaterial-integrated photobiomodulation offers huge promise for cognition-related disorders such as depression, Alzheimer's, and Parkinson's diseases that affect particular encephalic areas.
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