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Niemann–Pick disease (NP), also known as acid sphingomyelinase deficiency, is a group of rare genetic diseases of varying severity.These are inherited metabolic disorders in which sphingomyelin accumulates in lysosomes in cells of many organs.
The most common side events include infections, infusion-related reactions, or gastrointestinal complaints (disease signs and symptoms in children). [5] [7] Historically referred to as Niemann-Pick disease types A (NPD A) and B (NPD B), acid sphingomyelinase deficiency is a genetic disorder. [5]
The lysosomal storage disorders Niemann-Pick disease, SMPD1-associated (type A and B) are characterized by deficiencies in acid sphingomyelinase. [3] Diagnosis is confirmed by an aSMase activity less than 10% in the peripheral blood lymphocytes. [citation needed] Caused by a mutation in the SMPD1 gene, it is found in 1:250,000 in the population.
It is a genetically-inherited disease caused by a deficiency in the lysosomal enzyme acid sphingomyelinase, which causes the accumulation of sphingomyelin in spleen, liver, lungs, bone marrow, and brain, causing irreversible neurological damage. Of the two types involving sphingomyelinase, type A occurs in infants.
In Types A and B, there is complete or partial deficiency of the lysosomal enzyme called acid sphingomyelinase. In Niemann–Pick type C, the protein product of the major mutated gene NPC1 is not an enzyme but appears to function as a transporter in the endosomal-lysosomal system, which moves large water-insoluble molecules through the cell.
Sphingolipidoses are a class of lipid storage disorders or degenerative storage disorders caused by deficiency of an enzyme that is required for the catabolism of lipids that contain ceramide, [1] also relating to sphingolipid metabolism.
Sphingomyelin phosphodiesterase 1 (SMPD1), also known as acid sphingomyelinase (ASM), is an enzyme that in humans is encoded by the SMPD1 gene. Sphingomyelin phosphodiesterase 1 belongs to the sphingomyelin phosphodiesterase family. [5]
Functional inhibitors of acid sphingomyelinase, or FIASMA, [1] is a large group of pharmacological compounds inhibiting the enzyme acid sphingomyelinase (ASM, EC 3.1.4.12). ). This enzyme is mainly located within the lysosome, where it cleaves sphingomyelin to ceramide and sphingosine, the latter of which is then phosphorylated to sphingosine-1-phosp