The link between calorie restriction and a longer, healthier life may lie in the head, not in the gut, MIT biologists report.
Dietary restriction extends lifespan and retards age-related disease in many species, although the phenomenon's underlying mechanisms remain a mystery. Underfeeding an organism such as the ordinary roundworm alters its endocrine function, which regulates hormones instrumental in metabolism. But no connection between the longevity induced by calorie restriction and the endocrine system has been found-until now.
In a recent issue of Nature, Leonard P. Guarente, Novartis Professor of Biology, and postdoctoral associate Nicholas A. Bishop show that a particular pair of neurons in the heads of underfed worms may play an essential role in their lengthy lives. When these two individual neurons were killed by a laser beam, the worms could not enjoy the longevity normally associated with calorie restriction.
"This study directs our attention to the brain as a center for mediating the beneficial effects of calorie restriction in higher organisms, potentially including us," Guarente said. "A complete molecular understanding of calorie restriction may lead to new drugs for the major diseases of aging."
Restricting calories activates a gene in two neurons, Guarente and Bishop report. The gene, called skn-1, is found in a particular pair of sensory neurons in the head of the nematode worm Caenorhabditis elegans. These neurons are critical in translating information about food availability into endocrine signals. The neurons lead peripheral tissues to increase their metabolic activity, and this enhanced metabolism makes the worms live longer than normally fed counterparts.
In the study, the researchers also confirmed the results with a genetic test: They showed that skn-1 genes expressed only in these two cells support dietary-restriction longevity; without the genes, the longevity increase on dietary restriction disappeared. At the same time, the lack of skn-1 genes had little or no effect on the lifespan of worms whose calorie intake was not restricted, Guarente said.
"We suspect that the two neurons sense dietary restriction and secrete a hormone that increases metabolism-and life span-in the animal," he said.
Guarente, who published "Ageless Quest: One Scientist's Search for Genes that Prolong Youth" in 2003, discovered in 2000 that calorie restriction activates the silenced information regulator (SIR2) gene, which has the apparent ability to slow aging. This gene makes a protein called Sir2, which Guarente has shown is integrally tied to extending life span in yeast and in the roundworm. Humans carry a similar gene. How Sir2 relates to the two neurons identified in the findings is not yet clear, Guarente said.
Guarente suggests that the first commercial products based on manipulating Sir2 to slow aging will appear in the next 10 to 20 years. It is only a matter of time, he said, before aging itself is declared a disease.
This work is supported by the National Institutes of Health and the Glenn Foundation.
Deborah Halber | MIT News Office
Researchers target protein that protects bacteria's DNA 'recipes'
21.08.2018 | University of Rochester
Protein interaction helps Yersinia cause disease
21.08.2018 | Schwedischer Forschungsrat - The Swedish Research Council
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Ecology, The Environment and Conservation
21.08.2018 | Life Sciences
21.08.2018 | Power and Electrical Engineering