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APP/PS1KI bigenic mice develop early synaptic deficits and hippocampus atrophy.
Acta Neuropathol 2009; 117(6):677-85AN

Abstract

Abeta accumulation has an important function in the etiology of Alzheimer's disease (AD) with its typical clinical symptoms, like memory impairment and changes in personality. However, the mode of this toxic activity is still a matter of scientific debate. We used the APP/PS1KI mouse model for AD, because it is the only model so far which develops 50% hippocampal CA1 neuron loss at the age of 1 year. Previously, we have shown that this model develops severe learning deficits occurring much earlier at the age of 6 months. This observation prompted us to study the anatomical and cellular basis at this time point in more detail. In the current report, we observed that at 6 months of age there is already a 33% CA1 neuron loss and an 18% atrophy of the hippocampus, together with a drastic reduction of long-term potentiation and disrupted paired pulse facilitation. Interestingly, at 4 months of age, there was no long-term potentiation deficit in CA1. This was accompanied by reduced levels of pre- and post-synaptic markers. We also observed that intraneuronal and total amount of different Abeta peptides including N-modified, fibrillar and oligomeric Abeta species increased and coincided well with CA1 neuron loss. Overall, these data provide the basis for the observed robust working memory deficits in this mouse model for AD at 6 months of age.

Authors+Show Affiliations

Division of Molecular Psychiatry, Department of Psychiatry, Alzheimer Ph.D. Graduate School, University of Goettingen, Goettingen, Germany.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19387667

Citation

Breyhan, Henning, et al. "APP/PS1KI Bigenic Mice Develop Early Synaptic Deficits and Hippocampus Atrophy." Acta Neuropathologica, vol. 117, no. 6, 2009, pp. 677-85.
Breyhan H, Wirths O, Duan K, et al. APP/PS1KI bigenic mice develop early synaptic deficits and hippocampus atrophy. Acta Neuropathol. 2009;117(6):677-85.
Breyhan, H., Wirths, O., Duan, K., Marcello, A., Rettig, J., & Bayer, T. A. (2009). APP/PS1KI bigenic mice develop early synaptic deficits and hippocampus atrophy. Acta Neuropathologica, 117(6), pp. 677-85. doi:10.1007/s00401-009-0539-7.
Breyhan H, et al. APP/PS1KI Bigenic Mice Develop Early Synaptic Deficits and Hippocampus Atrophy. Acta Neuropathol. 2009;117(6):677-85. PubMed PMID: 19387667.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - APP/PS1KI bigenic mice develop early synaptic deficits and hippocampus atrophy. AU - Breyhan,Henning, AU - Wirths,Oliver, AU - Duan,Kailai, AU - Marcello,Andrea, AU - Rettig,Jens, AU - Bayer,Thomas A, Y1 - 2009/04/23/ PY - 2009/04/02/received PY - 2009/04/14/accepted PY - 2009/04/14/revised PY - 2009/4/24/entrez PY - 2009/4/24/pubmed PY - 2009/6/19/medline SP - 677 EP - 85 JF - Acta neuropathologica JO - Acta Neuropathol. VL - 117 IS - 6 N2 - Abeta accumulation has an important function in the etiology of Alzheimer's disease (AD) with its typical clinical symptoms, like memory impairment and changes in personality. However, the mode of this toxic activity is still a matter of scientific debate. We used the APP/PS1KI mouse model for AD, because it is the only model so far which develops 50% hippocampal CA1 neuron loss at the age of 1 year. Previously, we have shown that this model develops severe learning deficits occurring much earlier at the age of 6 months. This observation prompted us to study the anatomical and cellular basis at this time point in more detail. In the current report, we observed that at 6 months of age there is already a 33% CA1 neuron loss and an 18% atrophy of the hippocampus, together with a drastic reduction of long-term potentiation and disrupted paired pulse facilitation. Interestingly, at 4 months of age, there was no long-term potentiation deficit in CA1. This was accompanied by reduced levels of pre- and post-synaptic markers. We also observed that intraneuronal and total amount of different Abeta peptides including N-modified, fibrillar and oligomeric Abeta species increased and coincided well with CA1 neuron loss. Overall, these data provide the basis for the observed robust working memory deficits in this mouse model for AD at 6 months of age. SN - 1432-0533 UR - https://www.unboundmedicine.com/medline/citation/19387667/APP/PS1KI_bigenic_mice_develop_early_synaptic_deficits_and_hippocampus_atrophy_ L2 - https://dx.doi.org/10.1007/s00401-009-0539-7 DB - PRIME DP - Unbound Medicine ER -