Neutrophil azurophilic granule membrane

Neutrophil azurophilic granule membranes are the lipid bilayers that sequester the primary, or azurophilic, granules within neutrophil granulocytes (Source: PubMed PMID: 24663157). These granules function as specialized lysosomes, containing a high concentration of cytotoxic and hydrolytic enzymes such as myeloperoxidase (MPO), neutrophil elastase (NE), and proteinase 3 (PR3), which are essential for the intracellular destruction of pathogens (Source: StatPearls, Neutrophil Function). The membrane is characterized by the presence of specific proteins like CD63 (LAMP-3), which serves as a marker for degranulation when expressed on the cell surface (Source: UniProt P08962). It plays a pivotal role in the process of degranulation, where the granule fuses with the phagosome or the plasma membrane to release its contents during an immune response. Dysregulation of these membranes or the premature release of granule contents is a hallmark of various inflammatory conditions and autoimmune disorders, notably ANCA-associated vasculitis, where autoantibodies target granule components (Source: NIH/NCBI, ANCA-Associated Vasculitis). Therapeutic strategies often involve stabilizing these membranes or inhibiting the released enzymes using drugs like colchicine or corticosteroids to mitigate collateral tissue damage (Source: PubMed PMID: 10891102).

Other names

Primary granule membraneNeutrophil lysosomal membraneAzurophil granule membrane

Stabilization of lysosomal membranes and inhibition of microtubule-mediated degranulation to prevent the release of cytotoxic enzymes.