Navigation Links
Discovery points toward anti-inflammation treatment for blinding disease
Date:1/14/2010

The discovery of an inflammatory mediator key to the blinding effects of diabetic retinopathy is pointing toward a potential new treatment, Medical College of Georgia researchers said.

Interleukin-6, known to contribute to the debilitating joint inflammation of rheumatoid arthritis, also helps ignite inflammation of the retina, a first step in a disease that is the leading cause of blindness is working-age adults, MCG researchers reported online in Investigative Ophthalmology & Visual Science.

The finding has the scientists looking at whether an interleukin-6 antibody, which is showing success in treating rheumatoid arthritis, can halt inflammation in mice with diabetic retinopathy. "We expect that this neutralizing antibody can be used to treat diabetic retinopathy in the future," said Dr. Wenbo Zhang, assistant research scientist in MCG's Vascular Biology Center. Drs. Zhang and Modesto Rojas, senior postdoctoral fellow, are co-first authors on the paper.

Angiotensin II, a powerful constrictor of blood vessels, is typically associated with the kidneys where it plays a vital role in regulating blood pressure. The scientists suspect angiotensin II helps promotes wound healing and regulation of pressure within small blood vessels in the eye.

However in diabetes, angiotensin II levels increase in the eye probably in response to high glucose levels and help promote inflammation, spurring remodeling of blood vessels and tissue destruction, Dr. Rojas said. "Vascular inflammation is one of the first steps to inducing the changes in the retina."

MCG scientists have shown interleukin-6 is a needed accomplice whose previously undetectable levels in the eye also increase, said Dr. Ruth Caldwell, cell biologist a the Vascular Biology Center and the Charlie Norwood Veterans Affairs Medical Center and the study's corresponding author.

With the help of interleukin-6, angiotensin II induces white blood cells to stick to the endothelial cells lining blood vessels of the retina, which slows blood flow. The white blood cells also start producing inflammatory and vascular growth factors that cause blood vessel walls to leak and thicken, further constricting blood flow. Retinal cells start dying from the reduced blood and oxygen supplies that result. In response, the body prompts growth of new blood vessels, presumably to help but instead causing more vision impairment.

If the trigger, high glucose, was temporary, these natural responses might help clear damaged cells and protect the eye. "Inflammation is a compensatory mechanism that gets activated as a survival mechanism," Dr. Rojas said. "If it continues, the effect is bad."

"We have known for along time if patients keep their blood sugar under perfect control, they don't have these problems, but that's hard," Dr. Caldwell adds. "That is why it's such a difficult disease."

To examine interleukin-6's role in the destruction, the researchers injected angiotensin II into the vitreous portion of the eyes of mice missing the gene for the inflammatory factor as well as normal mice. The extra angiotensin did little to the retinal vessels of mice lacking interleukin-6 but vessels in the normal mouse retina mimicked the inflammatory reaction found in diabetic retinopathy. When they reintroduced interleukin-6 to the genetically altered mice, the damage mimicked that of the normal mice. "So when we knock out interleukin-6, we can block the effects of angiotensin II," Dr. Caldwell said.

The scientists want to see whether the interleukin-6 antibody can be used to prevent damage by giving it shortly after the onset of diabetes in rodents and as a treatment by using it later in the disease process.


'/>"/>

Contact: Toni Baker
tbaker@mcg.edu
706-721-4421
Medical College of Georgia
Source:Eurekalert  

Related biology news :

1. Discovery at JGH opens door to new treatments for prostate, brain and skin cancers
2. Discovery of a new molecular mechanism that guides visual nerves towards the brain
3. New discovery by Harvard scientists aims to correct cellular defects leading to diabetes
4. New year, new vitamin C discovery: It cures mice with accelerated aging disease
5. Emerald BioStructures announces discovery of small molecule modulators of PDE4
6. UGA researchers lead team in discovery involving devastating freshwater fish parasite, Ich
7. Discovery makes brain tumor cells more responsive to radiation
8. Discovery of the Jekyll-and-Hyde factors in coral bleaching
9. Rocket science leads to new whale discovery
10. A year after discovery, Congos mother lode of gorillas remains vulnerable
11. Cancer metabolism discovery uncovers new role of IDH1 gene mutation in brain cancer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Discovery points toward anti-inflammation treatment for blinding disease
(Date:2/3/2016)... Calif. , Feb. 3, 2016 Vigilant ... Police Department in Missouri ... license plate reader (LPR) data from Vigilant Solutions. ... hit-and-run case in which the victim was walking out of a convenience ... parking space next to his vehicle, striking his vehicle ...
(Date:2/2/2016)... 2016 Checkpoint Inhibitors for Cancer – ... Are you interested in the future of cancer ... inhibitors. Visiongain,s report gives those predictions to 2026 ... level. Avoid falling behind in data or ... revenues those emerging cancer therapies can achieve. There ...
(Date:2/1/2016)... Canada , February 1, 2016 ... technological advancements to drive global touchfree intuitive gesture control ... --> Rising sales of consumer electronics coupled ... gesture control market size through ... consumer electronics coupled with new technological advancements to drive ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... ... February 10, 2016 , ... PatientCrossroads announces ... the secure online PatientCrossroads platform, has exceeded both its one-year and overall recruitment ... PROMPT study, which seeks to advance understanding of the hereditary risks for certain ...
(Date:2/9/2016)... ... February 09, 2016 , ... With a presidential election in November ... Business Conference will bring together over 500 top healthcare leaders for a night and ... The conference, organized by MBA students of the University of Pennsylvania’s Wharton School, will ...
(Date:2/9/2016)... ... February 09, 2016 , ... Tunnell Consulting, Inc. announced that Frédéric Lefebvre ... will focus on acquiring new accounts and work closely with existing Tunnell clients throughout ... brings to our European clients more than 15 years of experience in the pharmaceutical ...
(Date:2/9/2016)... This market research report on the global ... of the market in terms of revenue (USD Million). ... the manufacture of microbiology culture media and related products. ... snapshot providing the overall information of various market segments ... also provides the overall information and data analysis of ...
Breaking Biology Technology: