Navigation Links
Wistar Institute team finds key target of aging regulator
Date:6/10/2009

Researchers at The Wistar Institute have defined a key target of an evolutionarily conserved protein that regulates the process of aging. The study, published June 11 in Nature, provides fundamental knowledge about key mechanisms of aging that could point toward new anti-aging strategies and cancer therapies.

Scientists have long known that a class of proteins called sirtuins promotes fitness and longevity in most organisms ranging from single-celled yeast to mammals. At the cellular level, sirtuins protect genome integrity, enhance resistance to adverse stresses, and antagonize senescence. However, the underlying molecular mechanisms have remained poorly understood. The team, led by senior author Shelley Berger, Ph.D., Hilary Koprowski Professor at The Wistar Institute, demonstrated for the first time a molecular target for a member of this class, Sir2, in regulation of aging in yeast cells. Sir2 removes an acetyl group attached to a specific site (lysine at position 16 or K16) on histone H4histones are proteins that package and organize the long strands of DNA within the nucleus and also are central regulators in turning genes on and off. The study reveals that removal of this acetyl group by Sir2 near the chromosome endsthe telomeresis important for yeast cells to maintain the ability to replicate. Researchers found that Sir2 levels decline as cells age, and there is a concomitant accumulation of the acetylation mark along with disrupted histone organization at telomeres.

Deacetylation of H4K16 by Sir2 and consequent telomere stability play a major role in maintaining long lifespan in yeast. Since sirtuins deacetylate many different proteins, these results clarify a key role of Sir2 protein in control of lifespan.

"Some modifications on histones, like this acetylation on histone H4 lysine 16, are persistent and are maintained through generations of cell divisions. This DNA-independent inheritance is called epigenetics," Berger says. "Characteristic epigenetic features have been discovered for various developmental processes in recent years. Understanding epigenetic changes associated with aging is a hugely exciting direction in aging research. It will provide insights and ideas not only for new therapies to regulate cells that have lost control of proliferation, such as 'immortal' cells found in cancers, but also for new strategies to maintain health and fitness."

"We plan to continue to search for new targets of Sir2 and other aging regulators," says lead author Weiwei Dang, Ph.D., a postdoctoral scientist working with Berger. "We are designing unbiased screens for other aging targets and mechanisms in chromatin. Using yeast as our aging model enables us to do many discovery screens that are impossible with other, more complex organisms. Yet it is remarkable that many of these chromatin mechanisms associated with yeast could turn out to be relevant even for aging human cells."


'/>"/>

Contact: Susan Finkelstein
sfinkelstein@wistar.org
215-898-3943
The Wistar Institute
Source:Eurekalert

Related medicine news :

1. Los Angeles Times writer wins Wistar Institute Science Journalism Award
2. The Wistar Institute collaborates with the Coriell Institute to distribute cell lines
3. Novel vaccine concept developed by scientists at the Wistar Institute
4. Cortiva Institute to Open Branch Location in Woodridge, IL
5. Entest BioMedical Inc. Adds Former National Cancer Institute Researcher to Scientific Advisory Board With Focus on Stem Cell Cancer Patient Therapies
6. Senetek PLC Gains Six Year Extension of Rights from Czech Republic Institute of Experimental Botany
7. Ludwig Institute of Cancer Research Ltd., Brussels Branch, Issues Statement Concerning Prospect Therapeutics Incs. GCS-100 Molecule
8. Ortho Biotech Oncology Research & Development Announces Collaboration with National Cancer Institute to Develop Novel Cell Therapies to Treat Cancer
9. Z Trim Holdings Abstract Selected as Best of the Best by Institute of Food Technologists
10. Council for American Medical Innovation and The Aspen Institute Bring Leaders Together In Washington, D.C., To Discuss The Economic Impact Of Medical Science and Discovery, and Policies Needed To Maintain U.S. Leadership at Best And Brightest Forum On Me
11. Florida Hospital Cardiovascular Institute Completes House-Wide Implementation of the LifeSync(R) Wireless ECG System
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/24/2016)... ... June 24, 2016 , ... The Pulmonary Hypertension Association ... it will receive two significant new grants to support its work to advance ... 25th anniversary by recognizing patients, medical professionals and scientists for their work in ...
(Date:6/24/2016)... ... June 24, 2016 , ... Comfort Keepers® of San Diego, ... and the Road To Recovery® program to drive cancer patients to and from their ... to ensure the highest quality of life and ongoing independence. Getting to and ...
(Date:6/24/2016)... ... 2016 , ... EB Medicine presented its first-ever “Issue of ... in Ponte Vedra Beach, FL. The awards honor the outstanding work of leading ... and Pediatric Emergency Medicine Practice. , “With this award, we recognize the efforts ...
(Date:6/24/2016)... ... June 24, 2016 , ... Strategic ... Frederick area economy by obtaining investment capital for emerging technology companies. SCP ... that have already resulted in more than a million dollars of capital investment ...
(Date:6/24/2016)... ... June 24, 2016 , ... Today, MTI-GlobalStem, a ... cells and other difficult to transfect cells, announces its launch of the PluriQ™ ... Gene Editing System is a complete system for culturing and transfecting human ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... , June 23, 2016 The vast ... an outpatient dialysis facility.  Treatments are usually 3 times ... hours per visit, including travel time, equipment preparation and ... patient, but especially grueling for patients who are elderly ... a skilled nursing and rehabilitation centers for some duration ...
(Date:6/23/2016)... 2016  Experian Health, the healthcare industry ... patient payment and care experience, today announced ... and services that will enhance the breadth ... These award-winning solutions will enable healthcare professionals ... in an ever-changing environment and redefine front-office ...
(Date:6/23/2016)... 23, 2016  The National Pharmaceutical Council (NPC) ... health policy research organization as its newest member.  ... senior vice president and chief scientific officer, Mallinckrodt ... the NPC Board of Directors. ... has joined us in support of our efforts ...
Breaking Medicine Technology: