The aim of this study was toinvestigate the effects of soluble amyloid βprotein (Aβ), with the amino acid sequence 25–35 (Aβ25–35), on delayed rectifier potassium current (Ik) in CA3 neurons of rat hippocampal slices using blind whole-cell patch-clamp recording techniques. We also studied the neurotoxic mechanism of soluble Aβ25–35 in Alzheimer’s disease. Results showed thatsoluble Aβ25–35 significantly suppressed Ik in CA3 neurons of rat hippocampal slices in time-dependent and voltage-dependent manners. Soluble Aβ25–35 significantly shifted the steady-state activation curve of Ik to more negative potentials. Before and after application of Aβ25–35, the half-activation potentials of Ik were 5.88 ± 0.67 and –2.81 ± 0.76 mV, respectively (n = 8; p < 0.05), but the slope factor was not significantly changed. The results suggest that the inhibitory effect of soluble Aβ25–35 on Ik may be one of the mechanisms of neurotoxicity, which may play an important role in the pathogenesis of Alzheimer’s disease.

This content is only available via PDF.
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.