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Extracellular Zn 2+-independently attenuated LTP by human amyloid β 1-40 and rat amyloid β 1-42

Extracellular Zn 2+-independently attenuated LTP by human amyloid β 1-40 and rat amyloid β 1-42

Haruna Tamano, Mako Takiguchi, Ryota Shimaya, Paul A Adlard, Ashley I Bush, Atsushi Takeda

Biochem Biophys Res Commun. 2019 Jun 30;514(3):888-892.

PMID: 31084925

Abstract:

Human amyloid-β1-40 (Aβ1-40) and rat Aβ1-42 have lower affinity for extracellular Zn2+ than human Aβ1-42. Here we report extracellular Zn2+-independent attenuation of dentate gyrus long-term potentiation (LTP) by human Aβ1-40 and rat Aβ1-42. On the basis of the data that dentate gyrus LTP is extracellular Zn2+-dependently attenuated after local injection of human Aβ1-42 (25 pmol, 1 μl) into the dentate gyrus, which increases intracellular Zn2+ in the dentate gyrus, the toxicity of human Aβ1-40 and rat Aβ1-42 was compared in the in vivo system with human Aβ1-42. Dentate gyrus LTP was attenuated after injection of human Aβ1-40 and rat Aβ1-42 (25 pmol, 1 μl) into the dentate gyrus, which did not increase intracellular Zn2+ in the dentate gyrus. The attenuated LTP was not rescued by co-injection of CaEDTA, an extracellular Zn2+ chelator. The present study suggests that human Aβ1-40 and rat Aβ1-42 affect cognitive activity via extracellular Zn2+-independent mechanism at low micromolar concentration.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4248095	Amyloid β 1-40 rat			Price

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