Featured Research

from universities, journals, and other organizations

Biomarkers Used To Predict Chronological And Physiological Age

Date:
November 20, 2008
Source:
Buck Institute for Age Research
Summary:
How old are you really? Chronological age is easy -- count forward from birth. But establishing physiological age is purely subjective, based on how someone looks, feels and functions. Research in nematode worms is providing a crucial first step toward the development of biomarkers to predict chronological and physiological age in humans. This technology could facilitate testing of anti-aging therapies as well as give physicians a means of tracking how individuals "withstand the tests of time."

Scientists at the Buck Institute for Age Research have identified for the first time biomarkers of aging which are highly predictive of both chronological and physiological age. Biomarkers are biochemical features that can be used to measure the progress of disease or the effects of treatment. The research involves nematode worms, microarrays which measure changes in gene expression, and complex computer algorithms.

This is the first step toward identifying similar biomarkers in humans which would provide a means of scientifically validating anti-aging therapies.

Chronological and physiological age are rarely in sync. Determining chronological age in both worms and humans is easy – count forward from birth. Determining physiological age remains subjective – based on how someone looks or functions. Some 70 year old humans function at the level of those in their 50's, others become frail elderly sooner than would be expected. C. elegans, the nematode worm, is a similar creature. With an average lifespan of three weeks, some nematodes remain spry much longer than then their similarly-aged brethren, while others show signs of premature aging (lack of symmetrical appearance, uncoordinated motion, and the need to be prodded into movement).

Buck researchers were able to predict the age of the worms by doing whole-genome expression profiles of 104 individual wild-type worms covering the entire nematode lifespan and correlating that profiling with age-related behavior and survival. The study revealed a suite of genes that are actively involved in the aging process. The research was the largest study of aging utilizing gene profiling to date.

"This is the first evidence that physiological age can be predicted non-subjectively," said Simon Melov, PhD, Buck faculty member and lead author of the study. "This is a first step; our results were not perfect, but we were able to predict the ages of the animals 70% of the time, which is far better than anything that has been done before."

The findings have major implications for age research in humans. Examining biomarkers over time would provide a scientific baseline for clinical trials of anti-aging medicines, which is currently impossible to determine given the lengthy lifetime of human beings. The technology would also provide a means of determining whether an individual is aging faster or slower than would normally be expected.

Melov and his Buck Institute colleagues are considering several options for further studies. The next step is to do a larger study involving wild-type nematodes to see if the same suite of genes remains active in the aging process and to see if the predictive rate can be increased. Scientists are also considering comparing biomarkers in wild-type worms with mutant long-lived strains of the worms. Mouse studies may focus on gene expression profiling in different types of body tissue – for example, does heart muscle age faster than liver tissue given a certain set of environmental or nutritional factors. Melov also plans on utilizing this biomarker technology in studies involving humans who undertake various forms of exercise over a set length of time. Melov published a study in 2007 showing that regular strength training reversed aspects of aging in skeletal muscle in healthy seniors.

"I am optimistic that we will be able to pursue this line of research further," said Melov. "Research into the biology of aging in humans has been hampered by the lack of irrefutable biomarkers that correlate with the aging process". He added, "I am confident that at some point there will be a non-subjective method of determining how old someone is with a high level of confidence."

The research is due to appear in the November 20, 2008 online edition of Aging Cell.

Other researchers involved in the study include Buck scientist Tamara Golden; Alan Hubbard, University of California Berkeley, School of Public Health, Division of Biostatistics; and Caroline Dando and Michael Herren, both with the Fluidigm Corporation. The work was funded by grants from the National Institutes of Health.


Story Source:

The above story is based on materials provided by Buck Institute for Age Research. Note: Materials may be edited for content and length.


Cite This Page:

Buck Institute for Age Research. "Biomarkers Used To Predict Chronological And Physiological Age." ScienceDaily. ScienceDaily, 20 November 2008. <www.sciencedaily.com/releases/2008/11/081119171316.htm>.
Buck Institute for Age Research. (2008, November 20). Biomarkers Used To Predict Chronological And Physiological Age. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2008/11/081119171316.htm
Buck Institute for Age Research. "Biomarkers Used To Predict Chronological And Physiological Age." ScienceDaily. www.sciencedaily.com/releases/2008/11/081119171316.htm (accessed August 20, 2014).

Share This




More Health & Medicine News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: World's Oldest Man Lives in Japan

Raw: World's Oldest Man Lives in Japan

AP (Aug. 20, 2014) A 111-year-old Japanese was certified as the world's oldest man by Guinness World Records on Wednesday. Sakari Momoi, a native of Fukushima in northern Japan, was given a certificate at a hospital in Tokyo. (Aug. 20) Video provided by AP
Powered by NewsLook.com
Ebola-Hit Sierra Leone's Freetown a City on Edge

Ebola-Hit Sierra Leone's Freetown a City on Edge

AFP (Aug. 19, 2014) Residents of Sierra Leone's capital voice their fears as the Ebola virus sweeps through west Africa. Duration: 00:56 Video provided by AFP
Powered by NewsLook.com
101-Year-Old Working Man Has All The Advice You Need

101-Year-Old Working Man Has All The Advice You Need

Newsy (Aug. 19, 2014) Herman Goldman has worked at the same lighting store for almost 75 years. Find out his secrets to a happy, productive life. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
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