Scientists at the Max Planck Institute for Biology of Ageing discovered that a hormone receptor is one of the links between nutrition and life expectancy in the roundworms. The receptor protein NHR-62 increases the lifespan of the animals by twenty per cent if their calorie intake is reduced.
Roundworm C. elegans
Picture: MPI for Biology of Ageing
Another study showed that the hormone receptor NHR-8 affects development into adulthood as well as the maximum lifespan of the worms. Possibly receptors related to these also regulate life expectancy in human beings.
The roundworm Caenorhabditis elegans lives only about 20 days. This makes it an ideal research subject, as the complete lifecycle of the worm can be studied in a short time. Also, the worm consists of less than a thousand cells, and its genetic make-up has been extensively analysed, and contains many genes similar to humans. The scientists in Adam Antebi’s team at the Max Planck Institute for Biology of Ageing use Caenorhabditis elegans to find out how hormones influence ageing. They are particularly interested in hormone receptors that reside in the cell nucleus, which regulate the activity of metabolic genes.
Their results indicate that the receptor NHR-62 must be active for reduced dietary intake to fully prolong the life of worms. If NHR-62 is inactive, Caenorhabditis elegans will live 25% longer under dietary restriction than if this receptor is inactive. “It seems that there is an as yet unknown hormone which regulates lifespan using NHR-62. If we can identify this hormone and administer it to the worm, we may prolong its life without having to change its calorie intake”, Antebi explains.
A restricted diet also affects the expression of genes dramatically: out of the approximate 20,000 worm genes, 3,000 change their activity, and 600 of these show a dependence on NHR-62. It follows that there are many other candidates for improving life expectancy. Since humans have receptors similar to NHR-62, so-called HNF-4α, the Max Planck scientists suspect that the hormone receptors may not only control the maximum lifespan of roundworms, but might affect human beings as well.
However, nutrition also affects lifespan in several other ways. Another study by the scientists has shown that worms lacking the hormone receptor NHR-8 will remain longer in a pre-pubertal stage before they reach adulthood. They also die earlier than animals with this receptor. NHR-8 is a nuclear receptor, responsible for the animal’s cholesterol balance. “Without it, the worm cannot produce enough steroid hormones from the cholesterol and therefore reaches sexual maturity later on. In addition, its fatty acid metabolism changes and its life expectancy drops”, explains Antebi. Receptors similar to NHR-8 can be found in human beings too. Conceivably cholesterol metabolism could therefore regulate physical development and affect life expectancy in humans as well.
Title: Dietary Restriction Induced Longevity is Mediated by Nuclear Receptor NHR-62 in Caenorhabditis elegansAuthors: Heestand, B.N., Shen, Y., Liu, W., Magner, D.B., Storm, N., Meharg, C., Habermann, B., and Antebi, A. (2013)
PLoS Genet 9(7): e1003651.
Title: The NHR-8 Nuclear Receptor Regulates Cholesterol and Bile Acid Homeostasis in C. elegansAuthors: Daniel B. Magner, Joshua Wollam, Yidong Shen, Caroline Hoppe, Dongling Li, Christian Latza, Veerle Rottiers, Harald Hutter, Adam Antebi
CellMetabolism, 6 August 2013
Sabine Dzuck | Max-Planck-Institut
Further reports about: > Anti-ageing > Biology of Ageing > Caenorhabditis > Caenorhabditis elegans > Max Planck Institute > Nuclear > ageing > caloric intake > calorie intake > cholesterol metabolism > historical life expectancy > hormone receptor NHR-8 > human beings > metabolic genes > steroid hormone > synthetic biology
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