Newly-identified exercise gene could help with depression
December 2nd, 2007Boosting an exercise-related gene in the brain works as a powerful anti-depressant in mice—a finding that could lead to a new anti-depressant drug target, according to a Yale School of Medicine report in Nature Medicine.
“The VGF exercise-related gene and target for drug development could be even better than chemical antidepressants because it is already present in the brain,” said Ronald Duman, professor of psychiatry and senior author of the study.
Depression affects 16 percent of the population in the United States, at a related cost of $83 billion each year. Currently available anti-depressants help 65 percent of patients and require weeks to months before the patients experience relief.
Duman said it is known that exercise improves brain function and mental health, and provides protective benefits in the event of a brain injury or disease, but how this all happens in the brain is not well understood. He said the fact that existing medications take so long to work indicates that some neuronal adaptation or plasticity is needed.
He and his colleagues designed a custom microarray that was optimized to show small changes in gene expression, particularly in the brain’s hippocampus, a limbic structure highly sensitive to stress hormones, depression, and anti-depressants.
They then compared the brain activity of sedentary mice to those who were given running wheels. The researchers observed that the mice with wheels within one week were running more than six miles each night. Four independent array analyses of the mice turned up 33 hippocampal exercise-regulated genes—27 of which had never been identified before.
The action of one gene in particular—VGF—was greatly enhanced by exercise. Moreover, administering VGF functioned like a powerful anti-depressant, while blocking VGF inhibited the effects of exercise and induced depressive-like behavior in the mice.
“Identification of VGF provides a mechanism by which exercise produces antidepressant effects,” Duman said. “This information further supports the benefits of exercise and provides a novel target for the development of new antidepressants with a completely different mechanism of action than existing medications.”
Source: Yale University
Jun 26, 2009 |
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Perhaps I'm blowing up a little, but that's because I just finished my 1 hour run in 4 inches of snow in just a hoodie and shorts. So there. :) (And I ENJOYED it, fancy that. :) )
Research like this may be able to help people with depression start exercising so they can gain the natural benifits that come from it. Unfortunately comments like yours only make it less likely that they will seek help, preffering instead to believe the stigma of laziness (which you have helped preserve) and wallow in self pitty. Im glad that your life is so perfect, but please think before you type.
As for this research, well, no one can exercise 24/7. A normal depressed person, sure, they'd be helped by reasonable exercise. But someone suffering from chronic depression? I doubt it. I think the idea here is to find a way to supplement current (partially effective) treatments by overstimulating the gene in question. *shrugs* Whatever the idea is, it is interesting.
Energy Expended = Energy Consumed
If you eat small amounts of food, then you can lay on a bed all day long and you won't get fat. But if you wish to eat large amounts of food, you *must* burn off that excess energy, or you will get fat. Well, unless you have a fast metabolism. Sadly, I don't. If I eat and don't move, I gain weight like crazy:P.
The thing is, most of the food available today has a huge energy density. If you don't move, you can't eat much. One large chocolate bar provides more than enough energy to survive on if you can't move at all.
The body doesn't handle food as simple physics conservation of energy equation, but as a group of complex physiological subsystems and feedback loops.
Exercise helps the body stay fit as much by appetite suppression as by burning k-Joules. It does this by keeping the body/mind balance healthy so that leptin and insulin work together to modulate energy storage/production and control appetite urges.
Many studies show exercise alleviates depression. This article simply points to one more pathway that exercise activates.
Laying on a bed all day, no matter what you eat, is a recipe for both obesity and depression.