{"id":2268922,"date":"2020-01-31T08:46:38","date_gmt":"2020-01-31T13:46:38","guid":{"rendered":"https:\/\/www.futurity.org\/?p=2268922"},"modified":"2020-01-31T08:46:38","modified_gmt":"2020-01-31T13:46:38","slug":"stroke-glymphatic-system-cerebral-edema-2268922","status":"publish","type":"post","link":"https:\/\/www.futurity.org\/stroke-glymphatic-system-cerebral-edema-2268922\/","title":{"rendered":"After a stroke, the brain ‘drowns’ in its own fluid"},"content":{"rendered":"

During a stroke, the glymphatic system\u2014normally associated with the beneficial task of waste removal\u2014goes awry and floods the brain, triggering edema and drowning brain cells, new research in mice shows.<\/p>\n

Cerebral edema, swelling that occurs in the brain, is a severe and potentially fatal complication of stroke.<\/p>\n

The research may “point the way to potential new strategies that could improve stroke outcomes.”<\/p><\/blockquote>\n

“These findings show that the glymphatic system plays a central role in driving the acute tissue swelling in the brain after a stroke,” says senior author Maiken Nedergaard, codirector of the University of Rochester Medical Center (URMC) Center for Translational Neuromedicine.<\/p>\n

“Understanding this dynamic\u2014which is propelled by storms of electrical activity in the brain\u2014points the way to potential new strategies that could improve stroke outcomes.”<\/p>\n

First discovered<\/a> by the Nedergaard lab in 2012, the glymphatic system consists of a network that piggybacks on the brain’s blood circulation system and is comprised of layers of plumbing, with the inner blood vessel encased by a “tube” that transports cerebrospinal fluid (CSF). The system pumps CSF through brain tissue, primarily while we sleep<\/a>, washing away toxic proteins and other waste<\/a>.<\/p>\n

While edema is a well-known consequence of stroke, there are limited treatment options and the severity of swelling in the brain depends upon the extent and location of the stroke. Because the brain is trapped in the skull<\/a>, it has little room to expand.<\/p>\n

If the swelling is severe, it can push in on important structures such as the brainstem, which regulates the cardiovascular and respiratory systems, resulting in death. In extreme cases and often as a last resort, surgeons will remove a part of the skull to relieve the pressure on the brain.<\/p>\n

Prior to the findings of the new study, it has been assumed that the source of swelling was the result of fluid from blood.<\/p>\n

A flood in the brain<\/h3>\n

Ischemic stroke, the most common form of stroke, occurs when a vessel in the brain is blocked. Denied nutrients and oxygen, brain cells become compromised and depolarize\u2014often within minutes of a stroke. As the cells release energy and fire, they trigger neighboring cells, creating a domino effect that results in an electrical wave that expands outward from the site of the stroke, called spreading depolarization.<\/p>\n

As this occurs, neurons release vast amounts of potassium and neurotransmitters into the brain. This causes the smooth muscles cells that line the walls of blood vessels to seize up and contract, cutting off blood flow in a process known as spreading ischemia. CSF then flows into the ensuing vacuum, inundating brain tissue and causing edema.<\/p>\n

The already vulnerable brain cells in the path of the flood essentially drown in CSF and the brain begins to swell. These depolarization waves can continue in the brain for days and even weeks after the stroke, compounding the damage.<\/p>\n

“When you force every single cell, which is essentially a battery, to release its charge it represents the single largest disruption of brain function you can achieve\u2014you basically discharge the entire brain surface in one fell swoop,” says lead author Humberto Mestre, a PhD student in the Nedergaard lab.<\/p>\n

“The double hit of the spreading depolarization and the ischemia makes the blood vessels cramp, resulting in a level of constriction that is completely abnormal and creating conditions for CSF to rapidly flow into the brain.”<\/p>\n

The study correlates the brain regions in mice vulnerable to this post-stroke glymphatic system dysfunction with edema in the brains of humans who had sustained an ischemic stroke.<\/p>\n

Working toward new stroke therapies<\/h3>\n

The findings suggest potential new treatment strategies that could be used in combination with existing therapies focused on restoring blood flow to the brain quickly after a stroke. The study could also have implications for brain swelling observed in other conditions such as subarachnoid hemorrhage<\/a> and traumatic brain injury.<\/p>\n

Approaches that block specific receptors on nerve cells could inhibit or slow the cycle of spreading depolarization. Additionally, a water channel called aquaporin-4 on astrocytes\u2014an important support cell in the brain\u2014regulates the flow of CSF. When the team conducted the stroke experiments in mice genetically modified to lack aquaporin-4, CSF flow into the brain slowed significantly. Aquaporin-4 inhibitors currently under development as a potential treatment for cardiac arrest and other diseases could eventually be candidates to treat stroke.<\/p>\n

“Our hope is that this new finding will lead to novel interventions to reduce the severity of ischemic events, as well as other brain injuries<\/a> to which soldiers may be exposed,” says Matthew Munson, program manager in fluid dynamics at the Army Research Office, an element of the US Army Combat Capabilities Development Command’s Army Research Laboratory.<\/p>\n

“What’s equally exciting is that this new finding was not part of the original research proposal. That is the power of basic science research and working across disciplines. Scientists ‘follow their nose’ where the data and their hypotheses lead them\u2014often to important unanticipated applications.”<\/p>\n

The research will appear in 糖心视频<\/em>.<\/p>\n

Additional coauthors are from the University of Rochester; the University of Copenhagen; the Technical University of Denmark; Tel Aviv University; and the University of California, San Diego.<\/p>\n

Support for the research came from the National Institute of Neurological Disorders and Stroke, the National Institute of Aging, the US Army Research Office, Fondation Leducq Transatlantic Networks of Excellence Program, the Novo Nordisk and Lundbeck Foundations, and EU Horizon 2020.<\/p>\n

Source: University of Rochester<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

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