The Axis of Aging

Editor's choice in developmental biology

By | June 14, 2011

Fish image of telomere Alexei Protopopov, Ph.D. Belfer Institute for Applied Cancer Sciences

Fish image of telomereALEXEI PROTOPOPOV, PH.D. BELFER INSTITUTE FOR APPLIED CANCER SCIENCES

The paper

E. Sahin et al., “Telomere dysfunction induces metabolic and mitochondrial compromise,” Nature, 470:359-65, 2011. Free F1000 evaluation

The finding

Many cellular processes have been implicated in aging, but how these systems interact has remained a mystery. Ron DePinho of Dana-Farber Cancer Institute linked DNA damage from telomere dysfunction to reduced mitochondrial function, placing “telomeres and mitochondria right in the same axis of aging science,” DePinho says.

The phenotypes

In a mouse model of aging, animals with short telomeres display downregulated mitochondrial master regulator proteins known as PGCs as well as increased heart failure and liver dysfunction. When researchers forced expression of telomerase to rebuild telomeres, or when the PGC proteins were overexpressed, the aging phenotype was partially rescued.

The thread

In these mice, p53 overexpression led to mitochondrial dysfunction via blocking PGC expression. Conversely, when researchers knocked out p53, which responds to telomere shortening by triggering DNA repair, mitochondrial functions were partially restored. Thus p53 directly links telomeric aging to mitochondrial function, tying “loose ends into a common thread,” writes Kevin Conley in his F1000 evaluation.

The feedback

Free radicals are normal byproducts of the mitochondrial electron transport chain, though they can cause DNA damage. DePinho’s work suggests that telomere degradation exacerbates a feedback loop in which short-telomere-instigated suppression of mitochondrial regulation leads to the generation of more free radicals, suggesting the value of moderating this pathway in age-related diseases, says DePinho.

 

Add a Comment

Avatar of: You

You

Processing...
Processing...

Sign In with your LabX Media Group Passport to leave a comment

Not a member? Register Now!

LabX Media Group Passport Logo

Popular Now

  1. Top 10 Innovations 2016
    Features Top 10 Innovations 2016

    This year’s list of winners celebrates both large leaps and small (but important) steps in life science technology.

  2. Gut Microbes Linked to Neurodegenerative Disease
  3. Pubic Hair Grooming Linked to STI Risk
    The Nutshell Pubic Hair Grooming Linked to STI Risk

    Observational study suggests pubic hair grooming correlates with heightened risk of acquiring sexually transmitted infections, although causation remains unclear.

  4. Image of the Day: Parting Ways
    Image of the Day Image of the Day: Parting Ways

    The Allen Institute for Cell Science releases the first public collection of human induced pluripotent stem cells that have been fluorescently tagged using CRISPR.

Rockland