Recruitment and activation of caspase-8 by the Huntingtin-interacting protein Hip-1 and a novel partner Hippi

Francois G. Gervais, Roshni Singaraja, Steven Xanthoudakis, Claire Ann Gutekunst, Blair R. Leavitt, Martina Metzler, Abigail S Hackam, John Tam, John P. Vaillancourt, Vicky Houtzager, Dita M. Rasper, Sophie Roy, Michael R. Hayden, Donald W. Nicholson

Research output: Contribution to journalArticle

241 Citations (Scopus)

Abstract

In Huntington disease, polyglutamine expansion of the protein huntingtin (Htt) leads to selective neurodegenerative loss of medium spiny neurons throughout the striatum by an unknown apoptotic mechanism. Binding of Hip-1, a protein normally associated with Htt, is reduced by polyglutamine expansion. Free Hip-1 binds to a hitherto unknown polypeptide, Hippi (Hip-1 protein interactor), which has partial sequence homology to Hip-1 and similar tissue and subcellular distribution. The availability of free Hip-1 is modulated by polyglutamine length within Htt, with disease-associated polyglutamine expansion favouring the formation of pro-apoptotic Hippi-Hip-1 heterodimers. This heterodimer can recruit procaspase-8 into a complex of Hippi, Hip-1 and procaspase-8, and launch apoptosis through components of the 'extrinsic' cell-death pathway. We propose that Htt polyglutamine expansion liberates Hip-1 so that it can form a caspase-8 recruitment complex with Hippi. This novel non-receptor-mediated pathway for activating caspase-8 might contribute to neuronal death in Huntington disease.

Original languageEnglish
Pages (from-to)95-105
Number of pages11
JournalNature Cell Biology
Volume4
Issue number2
DOIs
StatePublished - Feb 23 2002
Externally publishedYes

Fingerprint

Caspase 8
Hip
Proteins
Huntington Disease
Huntingtin Protein
Tissue Distribution
Sequence Homology
Cell Death
polyglutamine
Apoptosis
Neurons

ASJC Scopus subject areas

  • Cell Biology

Cite this

Gervais, F. G., Singaraja, R., Xanthoudakis, S., Gutekunst, C. A., Leavitt, B. R., Metzler, M., ... Nicholson, D. W. (2002). Recruitment and activation of caspase-8 by the Huntingtin-interacting protein Hip-1 and a novel partner Hippi. Nature Cell Biology, 4(2), 95-105. https://doi.org/10.1038/ncb735

Recruitment and activation of caspase-8 by the Huntingtin-interacting protein Hip-1 and a novel partner Hippi. / Gervais, Francois G.; Singaraja, Roshni; Xanthoudakis, Steven; Gutekunst, Claire Ann; Leavitt, Blair R.; Metzler, Martina; Hackam, Abigail S; Tam, John; Vaillancourt, John P.; Houtzager, Vicky; Rasper, Dita M.; Roy, Sophie; Hayden, Michael R.; Nicholson, Donald W.

In: Nature Cell Biology, Vol. 4, No. 2, 23.02.2002, p. 95-105.

Research output: Contribution to journalArticle

Gervais, FG, Singaraja, R, Xanthoudakis, S, Gutekunst, CA, Leavitt, BR, Metzler, M, Hackam, AS, Tam, J, Vaillancourt, JP, Houtzager, V, Rasper, DM, Roy, S, Hayden, MR & Nicholson, DW 2002, 'Recruitment and activation of caspase-8 by the Huntingtin-interacting protein Hip-1 and a novel partner Hippi', Nature Cell Biology, vol. 4, no. 2, pp. 95-105. https://doi.org/10.1038/ncb735
Gervais FG, Singaraja R, Xanthoudakis S, Gutekunst CA, Leavitt BR, Metzler M et al. Recruitment and activation of caspase-8 by the Huntingtin-interacting protein Hip-1 and a novel partner Hippi. Nature Cell Biology. 2002 Feb 23;4(2):95-105. https://doi.org/10.1038/ncb735
Gervais, Francois G. ; Singaraja, Roshni ; Xanthoudakis, Steven ; Gutekunst, Claire Ann ; Leavitt, Blair R. ; Metzler, Martina ; Hackam, Abigail S ; Tam, John ; Vaillancourt, John P. ; Houtzager, Vicky ; Rasper, Dita M. ; Roy, Sophie ; Hayden, Michael R. ; Nicholson, Donald W. / Recruitment and activation of caspase-8 by the Huntingtin-interacting protein Hip-1 and a novel partner Hippi. In: Nature Cell Biology. 2002 ; Vol. 4, No. 2. pp. 95-105.
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