Calpain-12 (CAPN12)

Calpain-12 (CAPN12) is a member of the calpain family of intracellular, calcium-activated cysteine proteases. Unlike the ubiquitous calpains, calpain-12 is expressed predominantly in skin and hair follicles, where it regulates epidermal maturation and hair cycle progression[1][3][5]. Mutations in CAPN12 can lead to congenital exfoliative erythroderma, nail dystrophy, and hypotrichosis, resulting in profound defects in skin integrity[1][3][5]. In laboratory models, knockdown of CAPN12 impairs filaggrin maturation and disrupts epidermal morphogenesis. Additional studies suggest CAPN12 may participate in cytoskeletal dynamics, mitochondrial metabolism, and neurodegenerative processes. While pan-calpain inhibitors exist, no drugs with selective CAPN12 activity are currently available, and therapeutic targeting would require careful monitoring due to its crucial role in tissue homeostasis[1][3][4][5].

Other names

Calpain 12CAPN12CANP 12Calcium-activated neutral proteinase 12CAN12_HUMAN

Inhibition of calpain activity via blocking its cysteine protease function (by chelation of calcium or covalent modification of active-site cysteine) is the primary mechanism for pan-calpain inhibitors. Inhibitors typically block proteolytic activation triggered by calcium influx.