Researchers discover powerful defense against free radicals that cause aging, disease

Free radicals cause cell damage and death, aging and disease, and scientists have sought new ways to repel them for years.

Now, a new University of Michigan study outlines the discovery of a that acts as a powerful protectant against . Ironically, the protein is activated by excessive free radicals. Human mutations of the gene for this protein are previously known to cause a rare, neurodegenerative disease.

Lysosomes, which comprise the cell's recycling center, are crucial for cleaning up injured and dying parts of the cells, said lead researcher Haoxing Xu, U-M associate professor of molecular, cellular and .

When lysosomes "sense" an overload of free radicals, they activate a calcium channel on their membranes. This triggers the expression of many genes and the production of more and stronger lysosomes, which rev into overdrive to rid the damaged parts of the cells.

Free radicals are guilty in the aging process, Xu said.

"If we have chemical compounds that can directly activate this channel, we can lower the in aging and other diseases," he said. "The result will be that cell damage and free radical levels could be reduced, and one can possibly slow down aging."

How does the body tell itself that there are too many free radicals so that they can be reduced or removed? His study tells us how it's done, Xu said.

"Nature is really cool," said. "The janitor of the cell, the lysosome, has this radical-sensing ability."

The study, "MCOLN1 is a ROS Sensor in Lysosomes that Regulates Autophagy," is published online June 30 in Nature Communications. First authors are Xiaoli Zhang, Xiping Cheng and Yu Lu, all in the Xu lab.


Explore further

Study finds unexpected link between cell suicide and longevity

Journal information: Nature Communications

Citation: Researchers discover powerful defense against free radicals that cause aging, disease (2016, June 30) retrieved 18 July 2019 from https://medicalxpress.com/news/2016-06-powerful-defense-free-radicals-aging.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
187 shares

Feedback to editors

User comments

Dug
Jun 30, 2016
Yet, free radical damage is not a problem in the young - because the damages that occur are readily repaired. Once the genetic commands comes (post reproductive age generally) to start shutting down the repair processes - like free radical damage - aging occurs. We should be focusing on the those commands that shutdown repair processes.

Jun 30, 2016
Repair mechanisms just become less efficient as we age. Also, the cell and its mitochondria accumulate metabolic waste that's removed through autophagy, which is the process that can slow aging considerably. New compounds that facilitate autophagy would be a major step in anti-aging, ridding the body of cellular garbage. Calcium 2AEP is a compound that you can easily buy which works by protecting lysosomes from toxic penetration.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more