Friday, July 13, 2012
2.How does the immune system recognize and destroy the pathogenic bacteria?
Once bacteria enters into our body, the cells within our body recognize the bacteria. The cells have several pattern recognition receptors, which recognize components that are conserved among broad groups of bacteria. For example, these receptors recognize bacteria specific DNA, RNA and bacterial cell walls, respectively, but do not recognize product from ourselves. There are more than 30 receptors at the surface and inside of the cells.
However, our immune system must destroy only pathogenic bacteria because our body originally has many non-pathogenic and useful bacteria. It is still unclear how our immune systems identify only pathogenic bacteria but not non-pathogenic bacteria, though both groups of bacteria have the same components recognized by pattern recognition receptors.