Researchers Link Oxidation of Potassium Channel in Cells to Loss of Sensory Function in Aging


Newswise — Researchers at UMDNJ-Robert Wood Johnson Medical School are one step closer to determining how human cells can be protected against the affects of age-related neurodegeneration including Alzheimer's and Parkinson's disease. The findings, published this past month in Nature Neuroscience, link the oxidation of potassium channels, which control a variety of cell functions and are essential to neuronal function, to the loss of neuronal function in aging. The study further shows that the oxidation process can be blocked by modifying the potassium channel, thereby making it resistant to age-related deterioration.

The study was conducted by Federico Sesti, PhD, associate professor, Shi-Qing Cai, PhD, research associate, both in the department of physiology and biophysics. The research was supported by a grant from the National Institutes of Health.

Oxygen metabolism (the process by which living cells produce energy), leads to the production of highly reactive oxygen species (ROS), which can cause significant neurodegenerative damage in cells that are unable to protect themselves. This is seen most remarkably in aging cells, which experience both an increase in ROS production and a decrease in defense mechanisms, a condition known as oxidative stress.

Through their examination of cells in the laboratory, the researchers concluded that potassium channels are targets of ROS, resulting in modification to the cell that causes neuronal dysfunction. The researchers showed that by modifying a single cysteine residue, they could make the potassium channel resistant to oxidation, thereby allowing for normal functioning of the nervous system.

"ROS is a natural product of cell metabolism and normal, young cells are known to be resistant to its negative affects, however uncontrolled ROS can cause considerable damage to proteins, DNA and cell membranes," said Dr. Sesti. "It was our goal to determine the mechanism underlying age-related cell dysfunction and if there was a method to safeguard aging cells from damage. This discovery provides a foundation for developing therapies for neurodegenerative disorders, including multiple sclerosis and cardiovascular disease."

UMDNJ-ROBERT WOOD JOHNSON MEDICAL SCHOOLAs one of the nation's leading comprehensive medical schools, Robert Wood Johnson Medical School of the University of Medicine and Dentistry of New Jersey is dedicated to the pursuit of excellence in education, research, health care delivery, and the promotion of community health. In cooperation with Robert Wood Johnson University Hospital, the medical school's principal affiliate, they comprise New Jersey's premier academic medical center. In addition, Robert Wood Johnson Medical School has 34 hospital affiliates and ambulatory care sites throughout the region.

As one of the eight schools of the University of Medicine and Dentistry of New Jersey with 2,500 full-time and volunteer faculty, Robert Wood Johnson Medical School encompasses 22 basic science and clinical departments and hosts centers and institutes including The Cancer Institute of New Jersey, the Child Health Institute of New Jersey, the Center for Advanced Biotechnology and Medicine, the Environmental and Occupational Health Sciences Institute, and the Stem Cell Institute of New Jersey. The medical school maintains educational programs at the undergraduate, graduate and postgraduate levels for more than 1,500 students on its campuses in New Brunswick, Piscataway, and Camden, and provides continuing education courses for health care professionals and community education programs.

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