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Amyloid β protein immunotherapy neutralizes Aβ oligomers that disrupt synaptic plasticity in vivo

Abstract

One of the most clinically advanced forms of experimental disease-modifying treatment for Alzheimer disease is immunization against the amyloid β protein (Aβ)1,2,3,4,5,6,7, but how this may prevent cognitive impairment is unclear8,9,10,11,12,13. We hypothesized that antibodies to Aβ could exert a beneficial action by directly neutralizing potentially synaptotoxic soluble Aβ species14,15,16 in the brain. Intracerebroventricular injection of naturally secreted human Aβ inhibited long-term potentiation (LTP), a correlate of learning and memory17, in rat hippocampus in vivo but a monoclonal antibody to Aβ completely prevented the inhibition of LTP when injected after Aβ. Size fractionation showed that Aβ oligomers, not monomers or fibrils, were responsible for inhibiting LTP, and an Aβ antibody again prevented such inhibition. Active immunization against Aβ was partially effective, and the effects correlated positively with levels of antibodies to Aβ oligomers. The ability of exogenous and endogenous antibodies to rapidly neutralize soluble Aβ oligomers that disrupt synaptic plasticity in vivo suggests that treatment with such antibodies might show reversible cognitive deficits in early Alzheimer disease.

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Figure 1: In vivo administration of monoclonal antibodies to Aβ prevents the inhibition of hippocampal LTP by naturally secreted Aβ.
Figure 2: Direct neutralization of naturally secreted Aβ in the brain by antibody to Aβ.
Figure 3: Oligomers are the synaptotoxic Aβ species neutralized by antibodies to Aβ in vivo.
Figure 4: Endogenous antibodies to Aβ partially prevent the inhibition of LTP by natural Aβ oligomers.

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Acknowledgements

This research was funded by Science Foundation Ireland (M.R. and R.A.), the Health Research Board of Ireland (M.R. and R.A.), Enterprise Ireland (M.R. and R.A.), the Irish Higher Education Authority (Programme for Research in Third Level Institutions) (M.R. and R.A.), the Wellcome Trust (M.R., R.A. and D.W.), the US National Institutes of Health (grant number AG06173 to D.S.) and the Foundation for Neurologic Diseases (C.L. and D.S.).

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Correspondence to Dennis J Selkoe or Michael J Rowan.

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Dennis J. Selkoe is a consultant to Elan, plc.

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Isotope analysis (PDF 24 kb)

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Klyubin, I., Walsh, D., Lemere, C. et al. Amyloid β protein immunotherapy neutralizes Aβ oligomers that disrupt synaptic plasticity in vivo. Nat Med 11, 556–561 (2005). https://doi.org/10.1038/nm1234

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