Together with colleagues in Japan, Prof. Dr. Christine Rose and her doctoral student Jan Meyer from the Institute of Neurobiology at HHU have performed a study to address the cellular mechanisms that promote the development of epilepsy. While up to now, most studies and anti-epileptic drugs targeted nerve cells (neurons), this research team focused on a class of glial cells known as astrocytes.

Glial cells account for approximately half of all cells in the brain. There are different types of glial cells, which perform different functions. Astrocytes control the local environment and are responsible for the ion balance in the brain, but also play an important role in signal transmission between neurons.

In their recent paper, the researchers show that epileptic discharges lead to a rise in the pH of astrocytes, that is in their intracellular 'alkalisation'. The change in pH disrupts the communication within the intercellular astrocyte networks. This reduced communication between astrocytes appears to exacerbate epileptic activity of neurons.

This finding points towards a potential new target for suppressing epileptogenesis at a very early stage, namely by using drugs to suppress changes in astrocytic pH accompanying neuronal activity.

The researchers were able to confirm this option by showing that animals which were given such drugs suffered less severely from epileptic hyperexcitability than untreated animals.

Prof. Rose said: "This observation is very intriguing. But it still needs to be established whether or not it can be transferred to humans. And it will take a very long time before any potential drug can be developed and be really used in the clinics."

Story Source:

Materials provided by Heinrich-Heine University Duesseldorf. Original written by Arne Claussen. Note: Content may be edited for style and length.

Journal Reference:

1. Mariko Onodera, Jan Meyer, Kota Furukawa, Yuichi Hiraoka, Tomomi Aida, Kohichi Tanaka, Kenji F. Tanaka, Christine R. Rose and Ko Matsui. Exacerbation of epilepsy by astrocyte alkalization and gap junction uncoupling. Journal of Neuroscience, 2021 DOI: 10.1523/JNEUROSCI.2365-20.2020