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Study shows how aging impairs immune response
Date:7/17/2012

lained Dr. Santambrogio. "When you are exposed to viruses or bacteria, these cells engulf the pathogens and present them to the immune system, saying in effect, 'There's an infection going on, and here is the culpritgo get it.'"

Dr. Santambrogio, in collaboration with Einstein colleagues Fernando Macian-Juan, M.D., Ph.D. , and Ana Maria Cuervo, M.D., Ph.D. , isolated dendritic cells from aging mice and found that oxidation-damaged proteins had accumulated in those cells and had caused harmful effects. For example, oxidatively modified proteins hampered the function of endosomes, the cell's organelle where pathogens are inactivated.

When the mice were injected with a potent antioxidant in the abdominal cavity daily for two weeks, some of the effects of oxidative stress were reversed. This finding has implications for designing vaccines or therapies for humans, especially the elderly, whose weakened immune systems increase their susceptibility to infections and cancer, and reduces vaccine effectiveness. "Many elderly people respond very poorly to vaccination, so perhaps a cycle of therapy with antioxidants before vaccination might improve their immune response to vaccines," Dr. Santambrogio noted.


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Contact: Kim Newman
kimberly.newman@einstein.yu.edu
718-430-3101
Albert Einstein College of Medicine
Source:Eurekalert

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