Scientists Pinpoint Key Gene Driving Chronic Pain After Stroke

For nearly one-third of people who survive a stroke involving the thalamus, a deep brain structure, the ordeal is followed by chronic, hard-to-treat pain. Now, a new study in mice offers a vital clue to its cause. By analysing gene activity after a thalamic haemorrhage, scientists have pinpointed a specific gene, Gja1, as a key contributor to this pain.

This gene is active in astrocytes, the supportive star-shaped cells of the brain. The researchers found that increased Gja1 activity was strongly correlated with more severe pain-like behaviours in the animals. This process appears to be linked to ferroptosis, a form of programmed cell death involving iron that contributes to neuroinflammation.

The investigation combined advanced bioinformatics with experimental validation in mouse models. By identifying the central role of astrocytic Gja1, this work provides a preliminary experimental basis for developing targeted drugs to alleviate central post-stroke pain, offering new hope for survivors.