Navigation Links
Cell death from cytomegalovirus may bring new life to treatment of retinal disease
Date:1/5/2009

AUGUSTA, Ga. Just days after the first retinal cell gets infected with the common cytomegalovirus, contiguous cells start committing suicide and researchers believe their death may provide clues to better treatment of this potentially blinding infection.

Understanding the cell death may also provide new insight into the larger issue of how the retina responds to assault, whether by infection or a disease process such as diabetes, said Dr. Sally Atherton, virologist and immunologist who chairs the Department of Cellular Biology and Anatomy in the Medical College of Georgia School of Medicine. "We are trying to get to the bottom of the mechanisms of that cell death."

A recent $1.3 million grant from the National Eye Institute is enabling studies of what's likely the body's well-intended effort to stop cytomegalovirus retinitis. "We can try to infect certain cells and see what happens. We can try to inhibit the virus and see what that does. The immediate goal is to look at the apoptosis (cell death) trigger but the bigger picture is really looking at mechanisms of retinal damage during cytomegalovirus infection," Dr. Atherton said. Tools include a mouse model of human disease as well as a retinal cell culture system developed by MCG Assistant Research Scientist Ming Zhang.

Their perusing may identify new treatment targets; a modulator made by infected cells that prompts adjacent cell death could be one such target. And certainly there is plenty to study: "Lots of signaling pathways are activated. There are a whole host of genes that are up-regulated and down-regulated," Dr. Atherton said. Infected cells as well as cells that come in to cart off dead cells may secrete tumor necrosis factor, for example, an immune cell regulator that causes inflammation and also may trigger cell death. "There are various mechanisms by which apoptosis, or cell death, can be induced," Dr. Atherton said.

As activity and damage increase, patients may experience blurred vision and floaters, eye pain and redness. Treatments include antivirals that may need to be injected or implanted directly into the eye or even surgery.

"Normally the retina is neatly stratified. What happens is you get an infection in the most external part of the retina in humans the virus may actually have been latent in the retina and it triggers cell death of the next layer and eventually virus spreads deeper into the retina and spreads out more," Dr. Atherton said. "Unchecked it can ruin your vision," especially if it affects the macula, or central part of the retina responsible for highest visual acuity.

Fortunately, despite the fact that most people are infected with this herpesvirus family member that can be found in saliva, blood and semen, it's most typically latent.

Cytomegalovirus retinitis' last big resurrection came with the AIDS epidemic of the 1980s, when nearly half of patients who were dying were going blind as well, Dr. Atherton said. The advent of antiretrovirals to keep HIV in check helped silence cytomegalovirus retinitis as well but today the incidence is again increasing, she said. A suppressed immune system is the primary reason cytomegalovirus becomes active, which means neonates and patients with organ or bone marrow transplants or taking therapy also are increased risk. Scientists aren't certain about the recent, albeit less severe, increase in disease incidence, but HIV patients who have become resistant to their therapy or just tired of taking it, likely are a factor.


'/>"/>

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

Related medicine news :

1. Preventive Use of Antibiotics Cuts ICU Deaths
2. Sinovac Announces that Government Investigation Rules Out Healives Role in Childs Death
3. Newborn Hospital Deaths Highest for Those Without Insurance
4. Radiation Plus Hormone Therapy Cuts Prostate Cancer Deaths
5. Deaths From Heart Disease, Stroke Down 30%
6. Most Mt. Everest Deaths Occur Near Summit During Descent
7. Scientists ID Enzyme Causing Brain Cell Death
8. Hormone therapy for prostate cancer does not appear to increase cardiac deaths
9. Death rates in hospital highest for infants, and children without insurance
10. Painkillers Linked to Increase in Overdose Deaths
11. Cancer Deaths Take Heavy Financial Toll
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Cell death from cytomegalovirus may bring new life to treatment of retinal disease
(Date:5/5/2016)... ... May 05, 2016 , ... ... (LAIs), today announced a development collaboration with the Australian critical medicine company, ... such as schizophrenia. , LAI medicines can offer improved therapeutic benefits over oral ...
(Date:5/5/2016)... ... ... Einstein Medical is proud to announce that it has created ... at the 2016 ASCRS/ASOA Symposium and Congress, which takes place in New Orleans, LA ... Surgery and the American Society of Ophthalmic Administrations will be held at the Ernest ...
(Date:5/5/2016)... ... ... from Friday, May 6 - Sunday, May 8, fifteen elite athletes from Team Semper ... Mountain Bike Camp, hosted in conjunction with WTB and Cannondale in ... who’ll share pro tips with the injured veterans as they rip down some of the ...
(Date:5/5/2016)... Francisco, CA (PRWEB) , ... ... ... intensive lectures and hands-on exercises, the Wharton Seminars for Business Journalists ... a better understanding of key business and economic issues.  This one-day program ...
(Date:5/5/2016)... ... ... Derrin Doty Group has unveiled the latest charity campaign in their ongoing community ... The insurance provider’s caring team has been so moved by the sudden death of ... the flu, that they have decided to extend their original campaign. Compassionate community members ...
Breaking Medicine News(10 mins):
(Date:5/3/2016)... , May 4, 2016 ... 154 pages, profiling 09 key companies and supported ... professional and in-depth study on the current state ... overview of the industry including definitions, classifications, applications ... analysis is provided for the international market including ...
(Date:5/3/2016)... Germany , May 3, 2016  Axiogenesis has acquired a major investment from Sino-German High-Tech Fund to further ...    Photo - http://photos.prnewswire.com/prnh/20160503/362921 ... ... ... ...
(Date:5/3/2016)... 3, 2016   BIOTRONIK , a leader ... Food and Drug Administration (FDA) approval of Iperia ... heart failure patients with access to diagnostic magnetic ... remote monitoring with daily automatic transmission and closed ... in response to physiological demands. ...
Breaking Medicine Technology: