Featured Research

from universities, journals, and other organizations

Producing new neurons under all circumstances: A challenge that is just a mouse away

Date:
April 9, 2013
Source:
INSERM (Institut national de la santé et de la recherche médicale)
Summary:
Improving neuron production in elderly persons presenting with a decline in cognition is a major challenge facing an aging society and the emergence of neuro-degenerative conditions such as Alzheimer's disease. Researchers in France recently showed that the pharmacological blocking of the TGF-beta molecule improves the production of new neurons in the mouse model.

Improving neuron production in elderly persons presenting with a decline in cognition is a major challenge facing an aging society and the emergence of neuro-degenerative conditions such as Alzheimer's disease. INSERM and CEA researchers recently showed that the pharmacological blocking of the TGFβ molecule improves the production of new neurons in the mouse model. These results incentivise the development of targeted therapies enabling improved neuron production to alleviate cognitive decline in the elderly and reduce the cerebral lesions caused by radiotherapy.

The research is published in the journal EMBO Molecular Medicine.

New neurons are formed regularly in the adult brain in order to guarantee that all our cognitive capacities are maintained. This neurogenesis may be adversely affected in various situations and especially:

  • in the course of aging
  • after radiotherapy treatment of a brain tumour. (The irradiation of certain areas of the brain is, in fact, a central adjunctive therapy for brain tumours in adults and children).

According to certain studies, the reduction in our "stock" of neurons contributes to an irreversible decline in cognition. In the mouse, for example, researchers reported that exposing the brain to radiation in the order of 15 Gy[1] is accompanied by disruption to the olfactive memory and a reduction in neurogenesis. The same happens in aging in which a reduction in neurogenesis is associated with a loss of certain cognitive faculties. In patients receiving radiotherapy due to the removal of a brain tumour, the same phenomena can be observed.

Researchers are studying how to preserve the "neuron stock." To do this, they have tried to discover which factors are responsible for the decline in neurogenesis.

Contrary to what might have been believed, their initial observations show that neither heavy doses of radiation nor aging are responsible for the complete disappearance of the neural stem cells capable of producing neurons (and thus the origin of neurogenesis). Those that survive remain localised in a certain small area of the brain (the sub-ventricular zone (SVZ)). They nevertheless appear not to be capable of working correctly.

Additional experiments have made it possible to establish that in both situations, irradiation and aging, high levels of the cytokine[2] TGFβ cause the stem cells to become dormant, increasing their susceptibility to apoptosis (PCD) and reducing the number of new neurons.

"Our study concluded that although neurogenesis reduced in aging and after a high dose of radiation, many stem cells survive for several months, retaining their 'stem' characteristics," explains Marc-Andre Mouthon, one of the main authors of the research, that was conducted in conjunction with José Piñeda and François Boussin.

The second part of the project demonstrated that pharmacological blocking of TGFβ restores the production of new neurons in irradiated or aging mice.

For the researchers, these results will encourage the development of targeted therapies to block TGFβ in order to reduce the impact of brain lesions caused by radiotherapy and improving the production of neurons in the elderly presenting with a cognitive decline.

Notes:

[1] Molecule synthetised by immune system cells that is essential for communication between cells.

[2] The radiotherapy dosage received by living tissue is measured in grays (Gy): 1Gy corresponds to a transfer of 1 joule per 1 kilogram of matter.


Story Source:

The above story is based on materials provided by INSERM (Institut national de la santé et de la recherche médicale). Note: Materials may be edited for content and length.


Journal Reference:

  1. Jose R. Pineda, Mathieu Daynac, Alexandra Chicheportiche, Arantxa Cebrian-Silla, Karine Sii Felice, Jose Manuel Garcia-Verdugo, François D. Boussin, Marc-André Mouthon. Vascular-derived TGF-β increases in the stem cell niche and perturbs neurogenesis during aging and following irradiation in the adult mouse brain. EMBO Molecular Medicine, 2013; 5 (4): 548 DOI: 10.1002/emmm.201202197

Cite This Page:

INSERM (Institut national de la santé et de la recherche médicale). "Producing new neurons under all circumstances: A challenge that is just a mouse away." ScienceDaily. ScienceDaily, 9 April 2013. <www.sciencedaily.com/releases/2013/04/130409132002.htm>.
INSERM (Institut national de la santé et de la recherche médicale). (2013, April 9). Producing new neurons under all circumstances: A challenge that is just a mouse away. ScienceDaily. Retrieved October 2, 2014 from www.sciencedaily.com/releases/2013/04/130409132002.htm
INSERM (Institut national de la santé et de la recherche médicale). "Producing new neurons under all circumstances: A challenge that is just a mouse away." ScienceDaily. www.sciencedaily.com/releases/2013/04/130409132002.htm (accessed October 2, 2014).

Share This



More Mind & Brain News

Thursday, October 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Pregnancy Spacing Could Have Big Impact On Autism Risks

Pregnancy Spacing Could Have Big Impact On Autism Risks

Newsy (Oct. 1, 2014) — A new study says children born less than one year and more than five years after a sibling can have an increased risk for autism. Video provided by Newsy
Powered by NewsLook.com
Stopping School Violence

Stopping School Violence

Ivanhoe (Oct. 1, 2014) — A trauma doctor steps out of the hospital and into the classroom to teach kids how to calmly solve conflicts, avoiding a trip to the ER. Video provided by Ivanhoe
Powered by NewsLook.com
Pineal Cysts: Debilitating Pain

Pineal Cysts: Debilitating Pain

Ivanhoe (Oct. 1, 2014) — A tiny cyst in the brain that can cause debilitating symptoms like chronic headaches and insomnia, and the doctor who performs the delicate surgery to remove them. Video provided by Ivanhoe
Powered by NewsLook.com
Burning Away Brain Tumors

Burning Away Brain Tumors

Ivanhoe (Oct. 1, 2014) — Doctors are 'cooking' brain tumors. Hear how this new laser-heat procedure cuts down on recovery time. Video provided by Ivanhoe
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins