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Turning brain cells on using the power of light

Rochester researchers have refined the noninvasive method of bioluminescent optogenetics to activate parts of the brain

Harnessing light to activate brain cells

University of Rochester researchers have demonstrated a noninvasive method using BL-OG, or bioluminescent optogenetics, that harnesses light to activate neurons (brain cells) in the brain. The ability to regulate brain activation could transform invasive procedures such as deep brain stimulation that are used to treat Parkinson’s disease and other neurological conditions.

The advantage of this new technique is that it can create brain (as well as brain cells) activation without the use of an implanted device in the brain to deliver physical light, according to Manuel Gomez-Ramirez, an assistant professor of brain and cognitive sciences and with the University’s Del Monte Institute for Neuroscience, and the senior author of the study, which appears in the journal NeuroImage.

“BL-OG is an ideal method for noninvasively teasing apart neural circuits in the brain,” says Emily Murphy, the first author of the study and manager of the Haptics Lab, led by Gomez-Ramirez. “There are still so many things to learn about the structure and function of distinct brain areas and neuronal cell types that will help us understand how healthy brains function.”

How to turn on a light — without a switch

To turn on light in the brain, researchers need a few tools. The first one is optogenetics, an established research technique that uses light to activate or inactivate brain cells. The next tool is bioluminescence, the same chemical reaction that gives a firefly its glow, which provides the light optogenetics needs to work.

Combining these tools creates the material needed for BL-OG. But in order to work, BL-OG still needs something to “turn on” the light. The organic substance luciferin, when combined with bioluminescence, creates light that activates optogenetics and modulates cellular response in the brain and brain cells without an incision. Previous work by Gomez-Ramirez has shown that the chemical luciferin is harmless to the body.

The researchers in the Haptics Lab tested this combination. They put BL-OG into a pre-determined brain region in mice. They then injected luciferin through a vein in the animal’s tail to activate the targeted brain cells. They found that BL-OG effects occur rapidly in the brain, but that these effects could be controlled by scaling the dosage of the luciferin in the animal.

‘Fine-tuning’ bioluminescent optogenetics

“The advantage of this technique is we can create brain activation without a cable. There is less risk for infection and other things to go awry because it is a noninvasive method,” Gomez-Ramirez says. “If we want to standardize this technique in the lab, and potentially in the clinic, it is critical to map all the important parameters around using it. These latest findings allow us to now work on fine-tuning the desired effects of BL-OG based on need and requirements.”

Researchers were also able to track the neuromodulation effects of BL-OG through the bioluminescent activity in the brain and brain cells, another potential feature of this method that could provide insight into how the brain works.

The Alfred P. Sloan Foundation supported this research.


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References/Sources/Materials provided by:

This article was written by Kelsie Smith Hayduk at the University of Rochester Medical Center

https://www.rochester.edu/newscenter/bioluminescent-optogenetics-technique-noninvasive-brain-cells-621732/

https://www.urmc.rochester.edu

http://dx.doi.org/10.1016/j.neuroimage.2024.120882

Posted by the WHN News Desk
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