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Tumor Suppressor Role for TLR4 gene

 
  December, 21 2005 15:13
your information resource in human molecular genetics
 
     
A new study finds that a gene which plays an important role in immune function, known as toll-like receptor 4 (TLR4), may also play a critical role in suppressing chronic lung inflammation and tumor development in mice.

In the December 7, 2005 issue of the Journal of the National Cancer Institute, researchers at the National Institute of Environmental Health Sciences (NIEHS), a part of the National Institutes of Health, report that mice prone to lung cancer that had TLR4 removed or altered had 60 percent more tumors than mice that had intact receptors, illustrating a new protective role for this gene. There were no differences in overall tumor size or structure between the mice. TLR4 is part of what immunologists refer to as the “innate immune system” which acts as the body’s first line of defense against harmful substances.

Researchers explain the immune system actually is comprised of two components or systems, the innate and the acquired. The innate system can be thought of as the way the body is naturally programmed to respond, forming the front line of defense against infection. The acquired depends on the development of antibodies and other systems to recognize pathogens and other foreign objects that might upset the body’s ability to fight off diseases. Understanding more about how the innate system works will help inform how the more complex, acquired system works.


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