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Inflammation Results from Non-human Sugar in Biotech Drugs
This non-human sialic acid sugar is an ingredient in some biotechnology drugs, and may be limiting or undermining their therapeutic effectiveness in some patients, the scientists report in a letter published in the advance online July 25 edition of the journal Nature Biotechnology. However, they also propose a simple modification to the drug-making process that could solve the problem.
The presence of the non-human sialic acid sugar contaminant, called N-glycolyneuraminic acid or Neu5Gc, has long been known but ignored because it was believed healthy human immune systems did not react to it, said Ajit Varki, MD, professor of medicine and cellular and molecular medicine at UC San Diego School of Medicine. "Now we know that to be untrue." "We're all exposed to this non-human sugar," Varki added. "It's part of our diet, and especially abundant in red meat. We all develop antibodies to Neu5Gc, but this immune response varies greatly in people. Meanwhile, Neu5Gc from animal foods can get incorporated into the human body. For most people, this may not be a problem. But for some, the immune response to incorporated Neu5Gc may exacerbate a chronic inflammation process. This isn't the cause of any disease or condition, but we believe it might be akin to adding fuel to an existing fire."
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