JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Early detection of memory deficits and memory improvement with vaccinia virus complement control protein in an Alzheimer's disease model.

Vaccinia virus complement control protein (VCP) inhibits both the classical and alternate complement pathways. In diseases such as traumatic brain injury (TBI) and Alzheimer's disease (AD), pathological inflammation is caused by amongst several factors, prolonged or inappropriate activation of the complement system and is a significant cause of neurodegeneration. This study investigates for the first time the use of a cheeseboard maze to evaluate cognitive deficits and the effect of VCP on memory processes in 2- and 3-month-old mice that express mutant amyloid precursor protein (APPswe) and mutant presenilin 1 (Ps1dE9) that correspond to a form of early onset AD. A four-phase training schedule was carried out on the cheeseboard maze before intracranial injections of 5 microl of VCP (1.7 microg/microl) or 5 microl saline. Two weeks later the effect of VCP on memory was evaluated. A statistically significant decrease in goal latency in VCP-treated mice than saline-treated transgenic mice in both the first probe and reverse tasks was observed. Similarly, after a second intracranial VCP or saline injection performed 2 months later, the 6.5- and 7.5-month aged VCP-injected mice performed significantly better in goal latency in both second probe and reverse tasks than saline-treated mice. These data also demonstrated that the use of a dry maze is a sensitive technique for distinguishing cognitive measures between non-transgenic and APPswe/PS1De9 transgenic mice at a much earlier stage.

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