Navigation Links
Researchers discover molecule that causes secondary stroke

Scientists at the University of Cincinnati (UC) College of Medicine have discovered the cause of a deadly type of secondary stroke known as cerebral vasospasm.

A constriction of the blood vessels in the brain, cerebral vasospasm usually occurs three to 10 days following a massive brain bleed known as hemorrhagic stroke. Sixty percent of patients who survive the initial stroke develop vasospasm, and 40 percent of them die from it.

Vasospasm, says neurology department researcher Joseph Clark, PhD, results from a buildup of toxins caused by bleeding from the initial stroke. "Normally the cerebral spinal fluid that envelopes the brain carries off wastes and exchanges them for nutrients at what's called the blood-brain barrier," Dr. Clark says. "After a hemorrhagic stroke, however, toxins given off by the brain bleed contribute to the development of specific molecules that later causes the constricting vasospasm." A research team led by Dr. Clark has now identified the molecules that trigger vasospasm, a breakthrough, he says, that "raises hopes of developing not only new ways to treat the condition, but also a diagnostic test to determine which hemorrhagic stroke survivors are at greater risk."

Several spinal fluid components were suspected of causing the vasospasm, Dr. Clark explains. They included hemoglobin, bilirubin and peroxidized lipids, and a group of bilirubin oxidation products that the researchers called BOXes.

Building on Dr. Clark's earlier studies in rats, the team measured each of the suspect agents in 12 hemorrhagic stroke patients. Within 10 days, four of the group suffered a secondary cerebral vasospasm. The same patients were also found to have elevated levels of bilirubin and significantly higher levels of BOXes.

One of the 12 who had elevated bilirubin, but hardly any BOXes, did not experience a secondary stroke.

When bilirubin is elevated, says team member Gail Pyne-Geithman, PhD, it must be exposed to powerful oxidizers that cause the production of significant amounts of the BOXes. The correlation between elevated BOXes, bilirubin and oxidative stress in this study, she says, was "striking."

The researchers point out that although their findings are encouraging in terms of developing a diagnostic test and treatment, the number of patients in their study was small and more work is needed to confirm that vasospasm is more likely to occur in bleeding-stroke patients who have elevated levels of BOXes.


'"/>

Source:University of Cincinnati


Related biology news :

1. Researchers discover way to make cells in the eye sensitive to light
2. Researchers find how protein allows insects to detect and respond to pheromones
3. Researchers Uncover Key Step In Manufacture of Memory Protein
4. Researchers reveal the infectious impact of salmon farms on wild salmon
5. Researchers identify target for cancer drugs
6. Researchers find missing genes of ancient organism
7. Researchers trace evolution to relatively simple genetic changes
8. Researchers add new tool to tumor-treatment arsenal
9. UF Researchers Map Bacterial Proteins That Cause Tooth Loss
10. VCU Researchers Identify Networks Of Genes Responding To Alcohol In The Brain
11. Researchers develop rapid diagnostic tool for pathogen identification
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/18/2017)... a global expert in SoC-based imaging and computing solutions, has developed ... the company,s hybrid codec technology. A demonstration utilizing TeraFaces ® , ... showcased during the upcoming Medtec Japan at Tokyo Big Sight April ... Vegas Convention Center April 24-27. ... Click here for an image of the M820 ...
(Date:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
(Date:4/11/2017)... GARDENS, Fla. , April 11, 2017 /PRNewswire/ ... management and secure authentication solutions, today announced that ... by Intelligence Advanced Research Projects Activity (IARPA) to ... IARPA,s Thor program. "Innovation has been ... and IARPA,s Thor program will allow us to ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... ... first-ever genomics analysis platform specifically designed for life science researchers to analyze ... pioneering researcher Rosalind Franklin, who made a major contribution to the discovery ...
(Date:10/11/2017)... ... October 11, 2017 , ... ComplianceOnline’s Medical Device Summit is back ... 8th June 2018 in San Francisco, CA. The Summit brings together current and former ... CEOs, board directors and government officials from around the world to address key issues ...
(Date:10/11/2017)... ... 11, 2017 , ... Disappearing forests and increased emissions are the main causes ... each year. Especially those living in larger cities are affected by air pollution related ... the most pollution-affected countries globally - decided to take action. , “I knew I ...
(Date:10/10/2017)... ... October 10, 2017 , ... ... company advancing targeted antibody-drug conjugate (ADC) therapeutics, today confirmed licensing rights that ... Polymerized Liposomal Nanoparticle), a technology developed in collaboration with Children’s Hospital Los ...
Breaking Biology Technology: