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Niemann-Pick disease type C (NPC) is a fatal,neurovisceral lipid storage disease,neuropathologically characterized by cytoplasmic sequestration of glycolipids in neurons,progressive neuronal loss,neurofibrillary tangles (NFTs) formation,and axonal spheroids (AS).Cytoskeletal pathology including accumulation of hyperphosphorylated cytoskeletal proteins is a neuropathological hallmark of the mouse model of NPC (npc mice).With a goal of elucidating the mechanisms underlying the lesion formation,we investigated the temporal and spatial characteristics of cytoskeletal lesions and the roles of cdc2,cdk4,and cdk5 in lesion formation in young npc mice.Cytoskeletal lesions were detectable in npc mice at three weeks of age.Importantly,concomitant activation of cdc2/cyclin B 1 kinase and accumulation of a subsequently generated cohort of phospho-epitopes were detected.The activation of cdk4/cyclin D1 and cdk5/p25 kinases was observed during the fourth week of life in npc mice,and this activation contributed to the lesion formation.We concluded that the progression of cytoskeletal pathology in npc mice older than four weeks is accelerated by the cumulative effect of cdc2,cdk4,and cdk5 activation.Furthermore,cdc2/cyclin B1 may act as a key initial player one week earlier.Targeting cell cycle activation may be beneficial to slow down the NPC pathogenesis.