Lipopolysaccharide degradation pathway

The lipopolysaccharide degradation pathway, sometimes referred to as LPS detoxification, is not a single molecule or receptor but rather a series of enzymatic processes that break down bacterial lipopolysaccharides (LPS), which are major components of the outer membrane in Gram-negative bacteria. These pathways are crucial for host defense because intact LPS is a potent endotoxin that triggers strong inflammatory responses via receptors such as TLR4/MD2/CD14 on host cells. Key enzymes involved include acyloxyacyl hydrolase (AOAH)—which removes secondary acyl chains from lipid A, reducing its toxicity—and intestinal alkaline phosphatase, which dephosphorylates lipid A to further diminish its pro-inflammatory effects. The proper functioning of these pathways helps restore homeostasis after exposure to bacterial endotoxins and prevents excessive inflammation and related pathologies such as sepsis and chronic inflammatory diseases[3].

Enzymatic cleavage or modification of lipopolysaccharide molecules to reduce their endotoxic activity