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

July17, 2012 (Bronx, NY) Researchers at Albert Einstein College of Medicine of Yeshiva University have uncovered one of the mechanisms by which aging may compromise the ability of the immune system to fight infections and respond to vaccines. The study, conducted in aging mice, shows that administering antioxidants may help reverse this loss of immune function. The findings were published online this month in the journal Cell Reports.

"Aging is known to affect immune function, a phenomenon known as immunosenescence, but how this happens is not clear," said study leader Laura Santambrogio, M.D., Ph.D. , associate professor of pathology and of microbiology & immunology at Einstein. "Our study has uncovered several ways in which aging can worsen the body's overall ability to mount an effective immune response."

All cells generate chemicals called free radicals as a normal part of metabolism. These highly reactive, unstable molecules can readily damage proteins, lipids and other cellular components through oxidation (the reaction between oxygen and substances it comes in contact with). Cells keep "oxidative stress" in check by producing several enzymes that are scavengers of free radicals. But in aging, increased production of free radicals coupled with cells' decreased production of antioxidant enzymes cause a buildup of damaged proteins and other molecules that can be toxic to cells.

The current study is the first to examine whether age-related oxidative stress compromises the function of a type of immune cell called dendritic cells. "Dendritic cells are known as the 'sentinels of the immune system' and alert the rest of the immune system to the presence of microbial invaders," exp
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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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