Featured Research

from universities, journals, and other organizations

'Holy Grail' Of Cancer Therapy: Researchers Find Way To Protect Healthy Cells From Radiation Damage

Date:
October 21, 2009
Source:
University of Pittsburgh Schools of the Health Sciences
Summary:
Researchers may be hot on the heels of a Holy Grail of cancer therapy: They have found a way to not only protect healthy tissue from the toxic effects of radiation treatment, but also increase tumor death.

Researchers at the University of Pittsburgh School of Medicine and the National Cancer Institute (NCI), part of the National Institutes of Health, may be hot on the heels of a Holy Grail of cancer therapy: They have found a way to not only protect healthy tissue from the toxic effects of radiation treatment, but also increase tumor death. The findings appear today in Science Translational Medicine.

More than half of all cancer patients are treated at least in part with radiation, said study co-author Jeff S. Isenberg, M.D., M.P.H., associate professor, Division of Pulmonary, Allergy, and Critical Care Medicine, Pitt School of Medicine. But the same radiation that kills cancer cells can also destroy healthy ones, causing side effects such as nausea and vomiting, skin sores and rashes, and weakness and fatigue. Long-term radiation exposure can lead to the scarring and death of normal tissue.

He and his NCI colleagues have identified a biochemical signaling pathway that can profoundly influence what happens to both cancerous and healthy cells when they are exposed to radiation. In mouse experiments, they found that blocking a molecule called thrombospondin-1 from binding to its cell surface receptor, called CD47, affords normal tissues nearly complete protection from both standard and very high doses of radiation.

"We almost couldn't believe what we were seeing," Dr. Isenberg said. "This dramatic protective effect occurred in skin, muscle and bone marrow cells, which is very encouraging. Cells that might have died of radiation exposure remained viable and functional when pre-treated with agents that interfere with the thrombospondin-1/CD47 pathway."

There have been concerns that approaches to spare healthy cells will risk inadvertently protecting tumor cells, noted senior author David D. Roberts, Ph.D., of the NCI's Center for Cancer Research. But, he added, "in our experiments, suppression of CD47 robustly delayed the regrowth of tumors in radiation-treated mice."

It's not yet clear why disrupting the CD47 signaling pathway leads to these effects, the researchers said. It's possible that radiation impairs the immune response to tumors even while killing tumor cells, but suppression of CD47 keeps the immune cells safe. Decreasing CD47 levels on tumor cells also could make them more sensitive to attack by the patient's immune system after treatment. Or, suppression of injury to vascular cells might improve blood flow to allow naturally occurring anti-tumor immunity to reach cancer cells more easily.

The researchers are already exploring the signaling pathway's role in several other domains, noted Mark Gladwin, M.D., chief of Pitt's Division of Pulmonary, Allergy, and Critical Care Medicine and director of the Vascular Medicine Institute, where Dr. Isenberg is a principal investigator.

"Dr. Isenberg and his team are examining multiple disease treatment strategies for pulmonary hypertension, wound healing, sickle cell disease and heart attacks, based on the blockade of the thrombospondin-1/CD47 pathway," he said.

Co-authors of the paper include lead author Justin B. Maxhimer, M.D., David R. Soto-Pantoja, Ph.D., Lisa A. Ridnour, Ph.D., Hubert B. Shih, William G. Degraff, Maria Tsokos, M.D., and David A. Wink, Ph.D., all of the Center for Cancer Research, NCI.

The research was funded by the Intramural Research Program of the National Cancer Institute, the Howard Hughes Medical Institute-NIH Research Scholars Program and the NIH. The inventions described in this paper are the subject of a patent application.


Story Source:

The above story is based on materials provided by University of Pittsburgh Schools of the Health Sciences. Note: Materials may be edited for content and length.


Cite This Page:

University of Pittsburgh Schools of the Health Sciences. "'Holy Grail' Of Cancer Therapy: Researchers Find Way To Protect Healthy Cells From Radiation Damage." ScienceDaily. ScienceDaily, 21 October 2009. <www.sciencedaily.com/releases/2009/10/091021144246.htm>.
University of Pittsburgh Schools of the Health Sciences. (2009, October 21). 'Holy Grail' Of Cancer Therapy: Researchers Find Way To Protect Healthy Cells From Radiation Damage. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2009/10/091021144246.htm
University of Pittsburgh Schools of the Health Sciences. "'Holy Grail' Of Cancer Therapy: Researchers Find Way To Protect Healthy Cells From Radiation Damage." ScienceDaily. www.sciencedaily.com/releases/2009/10/091021144246.htm (accessed April 18, 2014).

Share This



More Health & Medicine News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Obama: 8 Million Healthcare Signups

Obama: 8 Million Healthcare Signups

AP (Apr. 17, 2014) President Barack Obama gave a briefing Thursday announcing 8 million people have signed up under the Affordable Care Act. He blasted continued Republican efforts to repeal the law. (April 17) Video provided by AP
Powered by NewsLook.com
Is Apathy A Sign Of A Shrinking Brain?

Is Apathy A Sign Of A Shrinking Brain?

Newsy (Apr. 17, 2014) A recent study links apathetic feelings to a smaller brain. Researchers say the results indicate a need for apathy screening for at-risk seniors. Video provided by Newsy
Powered by NewsLook.com
Could Even Casual Marijuana Use Alter Your Brain?

Could Even Casual Marijuana Use Alter Your Brain?

Newsy (Apr. 16, 2014) A new study conducted by researchers at Northwestern and Harvard suggests even casual marijuana use can alter your brain. Video provided by Newsy
Powered by NewsLook.com
Thousands Of Vials Of SARS Virus Go Missing

Thousands Of Vials Of SARS Virus Go Missing

Newsy (Apr. 16, 2014) A research institute in Paris somehow misplaced more than 2,000 vials of the deadly SARS virus. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins