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A role for apoE in regulating the levels of alpha-1-antichymotrypsin in the aging mouse brain and in Alzheimer's disease.

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By Licastro F, Campbell IL, Kincaid C, Veinbergs I, V • www.ProHealth.com • September 1, 1999


This study was designed to explore the possible functional relationships between apolipoprotein E (apoE) and the protease inhibitor alpha-1-antichymotrypsin in the aging mouse brain and in Alzheimer's disease. For this purpose, levels of EB22/5 (the mouse homologue to human alpha-1-antichymotrypsin) mRNA expression was studied in apoE-deficient mice.

These mice showed an age-dependent increase of EB22/5 mRNA expression in the brain. Furthermore, overexpression of allele 3 of human APOE gene in transgenic mice (in an apoE-deficient background) resulted in normalization of levels of EB22/5 mRNA expression compatible with levels found in control mice. In contrast, overexpression of human APOE4 allele or down-regulation of the apoE receptor low density lipoprotein receptor-related protein by deletion of the receptor-associated protein was associated with elevated levels of EB22/5 similar to apoE-deficient mice. Consistent with the findings in murine models, human alpha-1-antichymotrypsin protein was increased in brain homogenates from patients with Alzheimer's disease, and levels of this serpin were the highest in patients with the APOE4 allele.

In summary, the present study showed evidence supporting a role for apoE in regulating alpha-1-antichymotrypsin expression. This is relevant to Alzheimer's disease because these two molecules appear to be closely associated with the pathogenesis of this disorder.

Source: Am J Pathol 1999 Sep;155(3):869-75
PMID: 10487844, UI: 99419284

(Dipartimento di Patologia Sperimentale, University of Bologna, Bologna, Italy.)







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