Total recall: the role of PIDDosome components in neurodegeneration

Caspase-2 activity modulates AMP receptor trafficking and dendritic spine dynamics.A soluble tau fragment generated by caspase-2 is elevated in Alzheimer’s disease, Huntington's disease, and Lewy body disease and promotes cognitive defects.The genetic ablation of caspase-2 leads to symptomatic benefits in transgenic mice overexpressing mutant huntingtin or the amyloid-β precursor protein.Biallelic mutations in genes encoding p53-induced protein with a death domain 1, receptor-interacting protein-associated ICH-1/CED-3 homologous protein with a death domain cause intellectual, behavioral, and psychological abnormalities of varying severity, predominantly accompanied by pachygyria.Selective PIDDosome component inhibitors protect against neurotoxicity in in vitro models, which makes them promising therapeutic agents for the treatment of neurodegenerative diseases. The PIDDosome is a multiprotein complex that includes p53-induced protein with a death domain 1 (PIDD1), receptor-interacting protein-associated ICH-1/CED-3 homologous protein with a death domain (RAIDD), and caspase-2, the activation of which is driven by PIDDosome assembly. In addition to the key role of the PIDDosome in the regulation of cell differentiation, tissue homeostasis, and organogenesis and regeneration, caspase-2, RAIDD and PIDD1 engagement in neuronal development was shown. Here, we focus on the involvement of PIDDosome components in neurodegenerative disorders, including retinal neuropathies, different types of brain damage, and Alzheimer’s disease (AD), Huntington’s disease (HD), and Lewy body disease. We also discuss pathogenic variants of PIDD1, RAIDD, and caspase-2 that are associated with intellectual, behavioral, and psychological abnormalities, together with prospective PIDDosome inhibition strategies and their potential clinical application. The PIDDosome is a multiprotein complex that includes p53-induced protein with a death domain 1 (PIDD1), receptor-interacting protein-associated ICH-1/CED-3 homologous protein with a death domain (RAIDD), and caspase-2, the activation of which is driven by PIDDosome assembly. In addition to the key role of the PIDDosome in the regulation of cell differentiation, tissue homeostasis, and organogenesis and regeneration, caspase-2, RAIDD and PIDD1 engagement in neuronal development was shown. Here, we focus on the involvement of PIDDosome components in neurodegenerative disorders, including retinal neuropathies, different types of brain damag