Soluble β-amyloid induction of Alzheimer's phenotype for human fibroblast K+ channels

R. Etcheberrigaray, Etsuro Ito, C. S. Kim, D. L. Alkon

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Abstract

Although β-amyloid is the main constituent of neurite plaques and may play a role in the pathophysiology of Alzheimer's disease, mechanisms by which soluble β-amyloid might produce early symptoms such as memory loss before diffuse plaque deposition have not been implicated. Treatment of fibroblasts with β-amyloid (10 nM) induced the same potassium channel dysfunction previously shown to occur specifically in fibroblasts from patients with Alzheimer's disease-namely, the absence of a 113-picosiemen potassium channel. A tetraethylammonium-induced increase of intracellular concentrations of calcium, [Ca2+](i), a response that depends on functional 113-picosiemen potassium channels, was also eliminated or markedly reduced by 10 nM β-amyloid. Increased [Ca2+](i) induced by high concentrations of extracellular potassium and 166-picosiemen potassium channels were unaffected by 10 nM β-amyloid. In Alzheimer's disease, then, β-amyloid might alter potassium channels and thus impair neuronal function to produce symptoms such as memory loss by a means other than plaque formation.

Original languageEnglish
Pages (from-to)276-279
Number of pages4
JournalScience
Volume264
Issue number5156
Publication statusPublished - 1994
Externally publishedYes

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Cite this

Etcheberrigaray, R., Ito, E., Kim, C. S., & Alkon, D. L. (1994). Soluble β-amyloid induction of Alzheimer's phenotype for human fibroblast K+ channels. Science, 264(5156), 276-279.