Featured Research

from universities, journals, and other organizations

Chronic injury found in kidneys of healthy adults

Date:
May 4, 2010
Source:
Mayo Clinic
Summary:
Researchers have found that the kidneys of healthy adults show signs of chronic mild injury that increase with age. This damage is present even though the adults showed no clinical signs of kidney disease.

Mayo Clinic researchers have found that the kidneys of healthy adults show signs of chronic mild injury that increase with age. This damage is present even though the adults showed no clinical signs of kidney disease.

The findings are reported in the current issue of the Annals of Internal Medicine.

"This was a surprise," says Andrew Rule, M.D., M.Sc., a Mayo Clinic nephrologist and epidemiologist who led the study. "These patients' kidneys are functioning normally, and this damage doesn't show up on the tests doctors routinely use to assess kidney health. It means we need to come up with new tests to detect mild kidney injury more accurately."

The medical records of 1,203 people who donated kidneys at Mayo Clinic from 1999 to 2009 were used for the cross-sectional study. The donor kidneys were examined with a needle biopsy once they were transplanted into the recipient as part of a routine procedure to gather baseline information about the new kidney.

The researchers looked at four signs of nephrosclerosis, or chronic kidney injury: glomerulosclerosis (scarring of the kidney's filtration units), tubular atrophy (loss of the tubes that process urine), interstitial fibrosis (general scarring of the kidney tissue), and arteriosclerosis (narrowing of tiny blood vessels).

Researchers discovered that the percentage of donors with nephrosclerosis ranged from 2.7 percent for men and women ages 18-29 years to 73 percent for those ages 70-77 years. The greater damage with older age was not explained by differences in kidney function or risk factors for kidney disease.

"Even though there are signs of damage, the kidneys were functioning within normal parameters," says Dr. Rule. "These findings do not mean that older people shouldn't donate kidneys. As far as we know, this mild kidney injury is an inevitable consequence of aging. Instead, we need an age-specific cut point for kidney function to identify early kidney disease. Right now, doctors use the same cut point for a 20-year-old as for a 70-year-old. This does not take into consideration the normal decline in kidney function that comes with aging. With older age there may be decreased demand for kidney function since the changes in kidney function do not reflect kidney injury on biopsy."

Dr. Rule is working with an international team to develop a new test for nephrosclerosis. He says that people can lessen damage to their kidneys by preventing and treating diabetes and controlling their blood pressure. "Even when kidney function tests are normal, people with high blood pressure have kidneys that look eight years older on biopsy than the kidneys of people with normal blood pressure," Dr. Rule says.

The study was funded by the National Institutes of Health and the U.S. Public Health Service. Other members of the Mayo Clinic research team include Hatem Amer, M.D.; Lynn Cornell, M.D.; Sandra Taler, M.D.; Fernando Cosio, M.D.; Walter Kremers, Ph.D.; Stephen Textor, M.D.; and Mark Stegall, M.D.


Story Source:

The above story is based on materials provided by Mayo Clinic. Note: Materials may be edited for content and length.


Journal Reference:

  1. Andrew D. Rule, Hatem Amer, Lynn D. Cornell, Sandra J. Taler, Fernando G. Cosio, Walter K. Kremers, Stephen C. Textor, Mark D. Stegall. The Association Between Age and Nephrosclerosis on Renal Biopsy Among Healthy Adults. Annals of Internal Medicine, 2010; 152: 561-567 [link]

Cite This Page:

Mayo Clinic. "Chronic injury found in kidneys of healthy adults." ScienceDaily. ScienceDaily, 4 May 2010. <www.sciencedaily.com/releases/2010/05/100503174024.htm>.
Mayo Clinic. (2010, May 4). Chronic injury found in kidneys of healthy adults. ScienceDaily. Retrieved August 2, 2014 from www.sciencedaily.com/releases/2010/05/100503174024.htm
Mayo Clinic. "Chronic injury found in kidneys of healthy adults." ScienceDaily. www.sciencedaily.com/releases/2010/05/100503174024.htm (accessed August 2, 2014).

Share This




More Health & Medicine News

Saturday, August 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Texas Quintuplets Head Home

Texas Quintuplets Head Home

Reuters - US Online Video (Aug. 1, 2014) After four months in the hospital, the first quintuplets to be born at Baylor University Medical Center head home. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Ebola Patient Coming to U.S. for Treatment

Ebola Patient Coming to U.S. for Treatment

Reuters - US Online Video (Aug. 1, 2014) A U.S. aid worker infected with Ebola while working in West Africa will be treated in a high security ward at Emory University in Atlanta. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Ebola Vaccine Might Be Coming, But Where's It Been?

Ebola Vaccine Might Be Coming, But Where's It Been?

Newsy (Aug. 1, 2014) Health officials are working to fast-track a vaccine — the West-African Ebola outbreak has killed more than 700. But why didn't we already have one? Video provided by Newsy
Powered by NewsLook.com
Study Links Certain Birth Control Pills To Breast Cancer

Study Links Certain Birth Control Pills To Breast Cancer

Newsy (Aug. 1, 2014) Previous studies have made the link between birth control and breast cancer, but the latest makes the link to high-estrogen oral contraceptives. 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