Neutral sphingomyelinase (nSMase)

Neutral sphingomyelinase is a hydrolase enzyme that catalyzes the breakdown of sphingomyelin (a plasma membrane lipid) to generate ceramide and phosphocholine, functioning as a key regulator of sphingolipid metabolism and cellular signaling pathways[1][2][5]. The enzymatic activity is optimal at neutral pH and generally requires divalent cations such as Mg²⁺ for catalysis[2][4]. Several isoforms exist in mammals, including nSMase1 (SMPD2), nSMase2 (SMPD3; the predominant form in signaling), nSMase3, and mitochondria-associated nSMase (SMPD5)[4]. nSMase2 in particular is membrane-bound and plays an important role in stress responses, apoptosis, inflammation, exosome generation, and certain pathologies, such as cancer metastasis and neurodegeneration[2][3][4]. Dysregulation or abnormal activation of nSMase, especially nSMase2, has been implicated in a range of diseases due to its impact on ceramide-mediated signaling pathways[2][4]. Experimental inhibitors of neutral sphingomyelinase are under investigation as potential therapeutic agents for diverse indications[2].

Other names

Sphingomyelin phosphodiesteraseSMasesphingomyelin cholinephosphohydrolaseMg²⁺-dependent neutral sphingomyelinaseSMPD3 (neutral sphingomyelinase-2 gene)nSMase1nSMase2nSMase3

Enzyme inhibition (targeted to reduce ceramide production and downstream signaling pathways, including inflammation and apoptosis)[2]