New Research Sheds Light on Why Brain Tumors Recur

Gliomas are the most frequent brain tumour, and within this group glioblastomas are particularly fatal. Despite surgery, radiation and chemotherapy, gliomas may regrow and spread not only locally but also in other regions of the brain. This recurrence has puzzled scientists for decades but new research led by neuro-oncologist Dr. Annie Hsieh at the Harvard Medical School helps explain why these particular tumours are prone to recur in the brain (1^✔ ✔Trusted Source
Why do gliomas tend to recur in the brain?

Go to source).

Role of Glioma-Connecting Neurons

One of the observations made by Hsieh’s team is that while gliomas have been observed to make contacts with other gliomas, they actually make synaptic contacts with neurons that are already in existence in the brain.

By injecting a rabbit with a retrovirus and tracking the infection back to its source, the scientists were able to identify the areas of the brain in which glioma-innervating neurons are born. The study showed that neurons are originating from all parts of the brain including distant sites to form the tracts to the tumour. This integration with existing neuronal circuits shows how gliomas can invade distant areas in the brain.

Diversity of Neurons Involved

It also pointed out various forms of the neurons that are implicated with the growth of the tumor. Some of the main secreting neurotransmitters are excitatory, such as glutamate, and the majority of neurons that innervate gliomas are glutamatergic. But not all neurons are alike: some also make GABA, a inhibitory neurotransmitter, meaning the relationship between gliomas and the brain hardwiring is more complicated than anyone realized couple of years ago.

These results hold important potentials for the creation of novel therapeutics. The knowledge of glioma-innervating neurons and the way they connect with glioma lets researchers examine how these connections can be disrupted in order to stop glioma growth and avoid reoccurrence. Dr. Hsieh adds the caution that some of these discoveries will not make it into clinical use therapies for years.

Despite the gliomas being one of the most challenging tumors to manage, these studies into the neural networks supporting tumorous growth, suggests an optimistic tomorrow. Nevertheless, much effort in understanding the molecular and cellular basis of glioma is still needed, and this research forms part of the progress toward this goal.

Reference:

1. Why do gliomas tend to recur in the brain? - (https://news.harvard.edu/gazette/story/2024/12/why-do-gliomas-tend-to-recur-in-the-brain/)

Source-Medindia