Cells Show Signs of Faster Aging After Depression
Study found structures called telomeres were shorter in people with the condition
By Brenda Goodman
TUESDAY, Nov. 12 (HealthDay News) -- The cells of people who have had depression may age more quickly, a new study suggests.
Dutch researchers compared cell structures called telomeres in more than 2,400 people with and without depression.
Like the plastic tips at the ends of shoelaces, telomeres cap the ends of chromosomes to protect the cell's DNA from damage. Telomeres get a bit shorter each time a cell divides, so they are useful markers for aging.
The researchers found that the telomeres of people who had ever been depressed were significantly shorter -- about 83 to 84 base pairs of DNA shorter, on average -- than those of people who had never suffered from depression.
The results remained even after researchers accounted for a host of lifestyle factors that can also damage DNA, such as heavy drinking and cigarette smoking.
Since people naturally lose about 14 to 20 base pairs of DNA in the telomeres each year, the researchers said the difference represents about four to six years of advanced aging.
The study showed only an association between depression and shorter telomeres, and didn't prove a cause-and-effect link. The researchers said they aren't entirely sure what the shorter telomeres might mean in depression.
On one hand, study author Josine Verhoeven said, it could be that having shorter telomeres somehow sets a person up for mental troubles. But it's more likely that depression causes damage that leaves traces even at the cellular level, she said.
Depression is known to disrupt many physical systems. It alters hormones, suppresses the immune function and changes how nerves work. People with a history of depression have greater risks for diseases of aging, such as heart disease, type 2 diabetes, dementia and cancer.
"Results like ours suggest that psychological distress, as experienced by depressed persons, has a large, detrimental impact on the wear and tear of a person's body, resulting in accelerated biological aging," said Verhoeven, a doctoral researcher at VU University Medical Center in Amsterdam.
The study was published online Nov. 12 in the journal Molecular Psychiatry.