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What (who) is O antigen - definition
![[[Toll-like receptor]]s of the [[innate immune system]] recognize LPS and trigger an [[immune response]].](https://commons.wikimedia.org/wiki/Special:FilePath/Toll-like receptor pathways revised.jpg?width=200 "[[Toll-like receptor]]s of the [[innate immune system]] recognize LPS and trigger an [[immune response]].")
![An illustration that shows how antigens induce the [[immune system]] response by interacting with an [[antibody]] that matches the [[molecular structure]] of an antigen](https://commons.wikimedia.org/wiki/Special:FilePath/Antibody.svg?width=200 "An illustration that shows how antigens induce the [[immune system]] response by interacting with an [[antibody]] that matches the [[molecular structure]] of an antigen")
Wikipedia
Lipopolysaccharides (LPS) are large molecules consisting of a lipid and a polysaccharide that are bacterial toxins. They are composed of an O-antigen, an outer core, and an inner core all joined by a covalent bond, and are found in the outer membrane of Gram-negative bacteria. Today, the term endotoxin is often used synonymously with LPS, although there are a few endotoxins (in the original sense of toxins that are inside the bacterial cell that are released when the cell disintegrates) that are not related to LPS, such as the so-called delta endotoxin proteins produced by Bacillus thuringiensis.
Lipopolysaccharides can have substantial impacts on human health, primarily through interactions with the immune system. LPS is a potent activator of the immune system and pyrogen (agent that causes fever). In severe cases, LPS can play a role in causing septic shock. In lower levels and over a longer time period, there is evidence LPS may play an important and harmful role in autoimmunity, obesity, depression, and cellular senescence.
