G protein βγ complex-mediated apoptosis by familial Alzheimer's disease mutant of APP

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Abstract

In familial Alzheimer's disease (FAD), three missense mutations, V642I, V642F and V642G, that co-segregate with the disease phenotype have been discovered in the 695 amino acid form of the amyloid precursor protein APP. Expression of these mutants causes a COS cell NK1 clone to undergo pertussis toxin-sensitive apoptosis in an FAD trait-linked manner by activating the G protein G0, which consists of Gα0, and Gβγ subunits. We investigated which subunit was responsible for the induction of apoptosis by V642I APP in NK1 cells. In the same system, expression of mutationally activated Gα0, or Gα(i) induced little apoptosis. Apoptosis by V642I APP was antagonized by the overexpression of the carboxy-terminal amino acids 495-689 of the β-adrenergic receptor kinase-l, which blocks the specific functions of Gβγ. Co-transfection of Gβ2γ2 cDNAs, but not that of other Gβxγz (x = 1-3; z = 2, 3), induced DNA fragmentation in a manner sensitive to bcl-2. These data implicate Gβγ as a cell death mediator for the FAD-associated mutant of APP.

Original languageEnglish (US)
Pages (from-to)4897-4907
Number of pages11
JournalEMBO Journal
Volume16
Issue number16
DOIs
StatePublished - Aug 15 1997

Keywords

  • Amyloid precursor protein
  • Apoptosis
  • Familial Alzheimer's disease
  • G protein
  • βγ complex

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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