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05.04.18 Otsuki and Brand identify new stem cells that could aid regenerative medicine for brain repair

last modified Apr 05, 2018 07:19 PM
In this paper in Science, Otsuki and Brand report the discovery in the brain of a new type of quiescent stem cell (known as ‘G2 quiescent stem cell’) with higher regenerative potential than quiescent stem cells identified previously
05.04.18 Otsuki and Brand identify new stem cells that could aid regenerative medicine for brain repair

Stem cells awakening (green, red and yellow) from quiescence (blue) in the Drosophila brain.

Cell cycle heterogeneity directs the timing of neural stem cell activation from quiescence

Otsuki L & Brand AH (2018) Science 360 (6384): 99-102. DOI:10.1126/science.aan8795

 

‘Sleeping’ stem cells could aid regenerative medicine for brain repair

Scientists at the Wellcome Trust/ Cancer Research UK Gurdon Institute, University of Cambridge, have identified a new type of stem cell in the brain which they say has a high potential for repair following brain injury or disease.

 A major goal of regenerative research is to repair the brain efficiently following injury, for example due to stroke, Alzheimer’s disease or head trauma, disease or ageing. The brain is poor at repairing itself; however, it may become possible to improve repair without surgery by targeting stem cells residing in patients’ brains. Stem cells have the unique capacity to produce all of the cells in the brain but are normally kept inactive in a form of cellular ‘sleep’ known as quiescence. Quiescent cells do not proliferate or generate new cells. Thus, any regenerative therapy targeting stem cells must first awaken them from quiescence. 

In a study published today in the journal Science, Dr Leo Otsuki and Professor Andrea Brand report the discovery in the brain of a new type of quiescent stem cell (known as ‘G2 quiescent stem cell’) with higher regenerative potential than quiescent stem cells identified previously. Importantly, G2 quiescent stem cells awaken to make the key types of cell in the brain – neurons and glia – much faster than known quiescent stem cells, making them attractive targets for therapeutic design. 

“The brain is not good at repairing itself, but these newly-discovered stem cells suggest there may be a way to improve its ability,” says Professor Brand. “These stem cells are in a dormant state, but once awake, they have the ability to generate key brain cells.” 

By studying the fruit fly (Drosophila), the authors identified a gene known as tribblesthat selectively regulates G2 quiescent stem cells. The DNA of fruit flies has many similarities with that of humans, making them a useful model to understand human biology. Sixty per cent of human genes associated with disease are also found in Drosophila. The tribbles gene has counterparts in the mammalian genome that are expressed in stem cells in the brain. The researchers believe that drugs that target tribbles might be one route to awakening G2 quiescent stem cells. 

“We’ve found the gene that directs these cells to become quiescent,” adds Otsuki. “The next step is to identify potential drug-like molecules that block this gene and awaken a person’s stem cells.

“We believe there may be similar quiescent stem cells in other organs, and this discovery could help improve or develop new regenerative medicines.”

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Read more about research in the Brand lab.

Watch Andrea Brand describe her research on video.

Studying development to understand disease

The Gurdon Institute is funded by Wellcome and Cancer Research UK to study the biology of development, and how normal growth and maintenance go wrong in cancer and other diseases.

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