Desejo a vocês uma boa noite de sono!

Caros colegas do SBlogI,

Li recentemente um artigo que gostaria de compartilhar com vocês neste final de ano. Principalmente para os que por algum motivo: deadlines ou até mesmo filhos, não tiveram a oportunidade de dormir o suficiente e estão esperando ansiosamente o recesso ou férias de final de ano.

Reference: Sleep drives metabolite clearance from the adult brain.Science. 2013 Oct 18;342(6156):373-7. doi: 10.1126/science.1241224. PMID: 24136970.

Pesquisando mais sobre o assunto achei um comentário sobre o estudo no NIH News para a sua apreciação (http://www.nih.gov/researchmatters/october2013/10282013clear.htm):

How Sleep Clears the Brain

A mouse study suggests that sleep helps restore the brain by flushing out toxins that build up during waking hours. The results point to a potential new role for sleep in health and disease.

Cerebrospinal fluid (blue) flows through the brain and clears out toxins through a series of channels that expand during sleep. Image courtesy of Maiken Nedergaard.

Scientists and philosophers have long wondered why people sleep and how it affects the brain. Sleep is important for storing memories. It also has a restorative function. Lack of sleep impairs reasoning, problem-solving, and attention to detail, among other effects. However, the mechanisms behind these sleep benefits have been unknown.

Dr. Maiken Nedergaard and her colleagues at the University of Rochester Medical Center recently discovered a system that drains waste products from the brain. Cerebrospinal fluid, a clear liquid surrounding the brain and spinal cord, moves through the brain along a series of channels that surround blood vessels. The system is managed by the brain’s glial cells, and so the researchers called it the glymphatic system.

The scientists also reported that the glymphatic system can help remove a toxic protein called beta-amyloid from brain tissue. Beta-amyloid is renowned for accumulating in the brains of patients with Alzheimer's disease. Other research has shown that brain levels of beta-amyloid decrease during sleep. In their new study, the team tested the idea that sleep might affect beta-amyloid clearance by regulating the glymphatic system. The work was funded by NIH’s National Institute of Neurological Disorders and Stroke (NINDS).

The researchers first injected dye into the cerebrospinal fluid of mice and monitored electrical brain activity as they tracked the dye flow through the animals’ brains. As reported in the October 18, 2013, edition ofScience, the dye barely flowed when the mice were awake. In contrast, when the mice were unconscious—asleep or anesthetized—it flowed rapidly.

Changes in the way fluid moves through the brain between conscious and unconscious states may reflect differences in the space available for movement. To test the idea, the team used a method that measures the volume of the space outside brain cells. They found that this “extracellular” volume increased by 60% in the brain’s cortex when the mice were asleep or anesthetized.

The researchers next injected mice with labeled beta-amyloid and measured how long it lasted in their brains when they were asleep and awake. Beta-amyloid disappeared twice as quickly in the brains of mice that were asleep.

Glial cells control flow through the glymphatic system by shrinking and swelling. The hormone noradrenaline, which increases alertness, is known to cause cells to swell. The researchers thus tested whether the hormone might affect the glymphatic system. Treating mice with drugs that block noradrenaline induced a sleep-like state and increased brain fluid flow and extracellular brain volume. This result suggests a molecular connection between the sleep-wake cycle and the brain’s cleaning system.

The study raises the possibility that certain neurological disorders might be prevented or treated by manipulating the glymphatic system. “These findings have significant implications for treating ‘dirty brain’ diseases like Alzheimer’s,” Nedergaard says. “Understanding precisely how and when the brain activates the glymphatic system and clears waste is a critical first step in efforts to potentially modulate this system and make it work more efficiently.”

RELATED LINKS:

New Brain Cleaning System Discovered:

http://www.nih.gov/researchmatters/september2012/09172012brain.htm

The Benefits of Slumber:

http://newsinhealth.nih.gov/issue/apr2013/feature1

Alzheimer's Disease May Stem from Protein Clearance Problem: 
http://www.nih.gov/researchmatters/december2010/ 12202010alzdisease.htm

Sleep and Memory in the Aging Brain:

http://www.nih.gov/researchmatters/february2013/02112013sleep.htm

Naps Can Help Preschool Children Learn:

http://www.nih.gov/researchmatters/september2013/09302013naps.htm

Gostaria de terminar com um trecho do livro de François Jacob, O rato, a mosca e o homem: “Em pesquisa básica, se não há de início uma boa dose de incerteza sobre os resultados de um experimento, não há  possibilidade  de que se trate de um assunto  interessante. Em geral, parte-se de dados algo ambíguos e incompletos. O problema consiste  em encontrar  relações entre fragmentos de informações aparentemente independentes.”

Boas Festas!