Researchers test light-activated analgesia in mice

Light activation of the inactive forms of drugs may offer a powerful strategy for pain control, but further work is needed before it can be used in a clinical setting.

Light dispersion through a prism

Drugs targeting the metabotropic glutamate (mGlu) receptors, which are involved in pain transmission, are thought to be promising treatments for pain. However, their systemic use may be limited by significant side effects such as cognitive impairment and hepatotoxicity.

In a paper published in eLife
(online, 11 April 2017), researchers explored the use of a light-activated form of a candidate mGlu5 receptor modulator in mice.

Study results showed that the administration of the inactive form of the drug resulted in significant analgesia when activated by light either at the site of pain or in the thalamus, a key region of the brain involved in pain response.

The researchers say their results show that light activation of systemically inactive drugs could be a powerful strategy for pain control, but there are still several obstacles that must be overcome to transfer it to the clinical setting, such as assessment of the stability and toxicity of photoactive compounds.


[1] Font J, López-Cano M, Notartomaso S et al. Optical control of pain in vivo with a photoactive mGlu5 receptor negative allosteric modulator. eLife 2017;6:e23545. doi: 10.7554/eLife.23545

Last updated
The Pharmaceutical Journal, Researchers test light-activated analgesia in mice;Online:DOI:10.1211/PJ.2017.20202722

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