Navigation Links
Researchers explain why some wound infections become chronic
Date:12/17/2013

RIVERSIDE, Calif. Chronic wounds affect an estimated 6.5 million Americans at an annual cost of about $25 billion. Further, foot blisters and other diabetic ulcers or sores account for the vast majority of foot and leg amputations in the United States today.

Why does treating chronic wounds cost so much? What complicates chronic wound infections, making healing difficult?

Manuela Martins-Green, a professor of cell biology at the University of California, Riverside, reports that two biological activities are out of control in chronic wound infections. These are reactive oxygen species (ROS), which are chemically reactive molecules formed by the partial reduction of oxygen, and biofilms that are formed by selective invading bacteria.

ROS is the natural byproduct of the normal oxygen metabolism and plays a role in cell signaling and homeostasis. However, excessive ROS can induce chronic inflammation, a key characteristic of wounds that do not heal. The biofilms are bacterial defense mechanisms. Together they create a toxic environment that can resist efforts to heal and close a chronic wound.

"By decreasing ROS levels within a chronic wound in a diabetic mouse model, my lab was able to normalize conditions and heal the wound," Martins-Green said. "Indeed, we saw significant improvement in healing the wound."

She announced her findings on Dec. 17 in New Orleans, La., at the 53rd annual meeting of the American Society for Cell Biology.

To identify the central role of ROS in maintaining chronic wound infection, Martins-Green's lab inhibited two antioxidant enzymes, glutathione peroxidase and catalase. Ordinarily, these enzymes help maintain normal tissue levels of ROS. But when they were inhibited, the amount of ROS in the wounds soared and the biofilm strengthened. The scientists also found that the two antioxidant enzymes were more damaging if they were inhibited in combination rather than individually.

Next, to decrease ROS to normal levels, the researchers applied two strong antioxidant supplements, vitamin E and N-Acetyl cysteine. As a result, the activities of the antioxidant enzymes glutathione peroxidase and catalase were restored, ROS levels decreased, and the bacterial biofilm disintegrated in the wound all of which resulted in the development of healthier wound tissue and led to wound healing.

"Our results show for the first time that by deliberately modulating specific parameters, we can create chronic wounds and then reverse chronicity by antioxidant treatment," Martins-Green said. "These findings should help in unraveling the mechanisms underlying the development of chronic wounds and hence in identifying potential targets for treatment of these wounds in humans."


'/>"/>

Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert  

Related biology news :

1. Stanford researchers take a step toward developing a universal flu vaccine
2. Researchers engineer a hybrid 5 times more effective in delivering genetic material into cells
3. New organization brings together top researchers to sequence genomes of invertebrates
4. Bonefish spawning behavior in the Bahamas surprises researchers, should aid conservation
5. Where water is limited, researchers determine how much water is enough
6. Researchers at Penn help develop a dynamic model of tissue failure
7. Leibniz Prizes 2014: DFG honors 11 outstanding researchers
8. Researchers named to National Academy of Inventors
9. Researchers at Penn show optimal framework for heartbeats
10. University researchers observe surprising bonefish spawning behavior in the Bahamas
11. ASU researchers discover chameleons use colorful language to communicate
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers explain why some wound infections become chronic
(Date:4/19/2016)... UAE, April 20, 2016 The ... as a compact web-based "all-in-one" system solution for all ... fingerprint reader or the door interface with integration authorization ... access control systems. The minimal dimensions of the access ... into the building installations offer considerable freedom of design ...
(Date:4/14/2016)... April 14, 2016 BioCatch ... Detection, today announced the appointment of Eyal Goldwerger ... role. Goldwerger,s leadership appointment comes at a ... of the deployment of its platform at several of ... technology, which discerns unique cognitive and physiological factors, is ...
(Date:3/31/2016)... R.I. , March 31, 2016  Genomics firm ... of founding CEO, Barrett Bready , M.D., who ... members of the original technical leadership team, including Chief ... President of Product Development, Steve Nurnberg and Vice President ... returned to the company. Dr. Bready served ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... -- Global demand for enzymes is forecast to grow ... billion.  This market includes enzymes used in industrial ... animal feed, and other markets) and specialty applications ... beverages will remain the largest market for enzymes, ... containing enzymes in developing regions.  These and other ...
(Date:6/27/2016)... 2016  Sequenom, Inc. (NASDAQ: SQNM ), ... through the development of innovative products and services, announced ... United States denied its petition to review ... Sequenom,s U.S. Patent No. 6,258,540 (",540 Patent") are not ... the Supreme Court,s Mayo Collaborative Services v. Prometheus Laboratories ...
(Date:6/27/2016)... CA (PRWEB) , ... June 27, 2016 , ... ... for clinical trials, announced today the Clinical Reach Virtual Patient Encounter CONSULT ... care circle with the physician and clinical trial team. , Using the CONSULT module, ...
(Date:6/27/2016)... ... June 27, 2016 , ... Rolf ... join the faculty of the University of North Carolina Kenan-Flagler Business School ... and entrepreneurship at UNC Kenan-Flagler, with a focus on the school’s international efforts, ...
Breaking Biology Technology: