Prevention of prion disease symptoms in mice with deep PrP lowering
How to prepare an accurate paper press kit? Illustrated guide
J. E. Gentile, J. E. Farley, M. N. Kelemen, M. A. Mortberg, T. L. Corridon, V. Laversenne et al. · DOI: 10.64898/2026.10.22.761034 · Summary page
Why cover this story this week?
How low must a disease-linked protein go?
Lowering the prion protein PrP can slow prion disease in animals, but preventing symptoms has proved harder. A new preprint reports that a potent siRNA, delivered into the cerebrospinal fluid, reduced PrP to 12% residual in whole brain hemispheres of mice. Early, repeated treatment kept infected animals free of symptoms through 500 days post-inoculation, suppressed prion replication by 100-fold and minimized neuropathological changes. Treatment begun after symptoms appeared also substantially extended survival.
The depth of the reduction appears important: prion strains that respond differently to more modest lowering were both effectively addressed by deep knockdown. The researchers suggest that differences between these strains may involve neurotoxicity rather than replication speed. A separate siRNA targeting human PRNP durably lowered PrP in humanized mice and cynomolgus macaques, providing a bridge toward translation—not evidence of disease prevention in people. Beyond prion research, the study illustrates how the degree of target suppression can determine whether an intervention merely slows a process or keeps its consequences at bay.
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