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. 1996 May 15;15(10):2468–2475.

Negative transactivation of cAMP response element by familial Alzheimer's mutants of APP.

T Ikezu 1, T Okamoto 1, K Komatsuzaki 1, T Matsui 1, J A Martyn 1, I Nishimoto 1
PMCID: PMC450179  PMID: 8665854

Abstract

In familial Alzheimer's disease (FAD), missense point mutations V642I/F/G, which co-segregate with the disease phenotype, have been discovered in amyloid precursor APP695. Here, we report that three FAD mutants (FAD-APPs) negatively regulated the transcriptional activity of cAMP response element (CRE) by a G(o)-dependent mechanism, but expression of wildtype APP695 had no effect on CRE. Experiments with various Galpha(s) chimeras demonstrated that Phe-APP coupled selectively to the C-terminus of Galpha(0). Again, wild-type APP695 had no effect on its C-terminus. These data indicate that FAD-APPs are gain-of-function mutants of APP695 that negatively regulate the CRE activity through G(o). This negative transactivation of CRE is the first biochemically analyzed signal evoked by the three FAD-APPs, but not by wild-type APP695, in a whole-cell system. We discuss the significance of constitutive CRE suppression by FAD-APPs, which is potentially relevant to synaptic malplasticity or memory disorders.

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