Proteases Acting on Mutant Huntingtin Generate Cleaved Products that Differentially Build Up Cytoplasmic and Nuclear Inclusions

Astrid Lunkes (1) , Katrin Lindenberg (2) , Léa Ben-Haïem (1) , Chantal Weber (1) , Didier Devys (1) , G.Bernhard Landwehrmeyer (2) , Jean-Louis Mandel (1) , Yvon Trottier (1)

1 IGBMC - Institut de Génétique et de Biologie Moléculaire et Cellulaire
2 UUlm - University of Ulm

Proteolytic processing of mutant huntingtin (mhtt) is regarded as a key event in the pathogenesis of Huntington's disease (HD). Mhtt fragments containing a polyglutamine expansion form intracellular inclusions and are more cytotoxic than full-length mhtt. Here, we report that two distinct mhtt fragments, termed cp-A and cp-B, differentially build up nuclear and cytoplasmic inclusions in HD brain and in a cellular model for HD. Cp-A is released by cleavage of htt in a 10 amino acid domain and is the major fragment that aggregates in the nucleus. Furthermore, we provide evidence that cp-A and cp-B are most likely generated by aspartic endopeptidases acting in concert with the proteasome to ensure the normal turnover of htt. These proteolytic processes are thus potential targets for therapeutic intervention in HD.

Domaines: Neurosciences [q-bio.NC]

Astrid Lunkes, Katrin Lindenberg, Léa Ben-Haïem, Chantal Weber, Didier Devys, et al.. Proteases Acting on Mutant Huntingtin Generate Cleaved Products that Differentially Build Up Cytoplasmic and Nuclear Inclusions. Molecular Cell, 2002, 10 (2), pp.259-269. ⟨10.1016/s1097-2765(02)00602-0⟩. ⟨hal-03503164⟩