Increased clusterin (apolipoprotein J) expression in human and mouse brains infected with transmissible spongiform encephalopathies

Acta Neuropathologica
K SasakiToru Iwaki

Abstract

Clusterin (apolipoprotein J), a multifunctional protein involved in amyloidogenesis in Alzheimer's disease, was studied immunohistochemically in both human transmissible spongiform encephalopathies (TSEs) and a mouse model of human TSE. Clusterin immunoreactivity was co-localized with plaque-type deposits but not with punctate-type prion protein (PrP) deposits in human TSEs. On the other hand, clusterin-positive astrocytes were readily demonstrated in the regions of punctate PrP deposits, but not around plaque PrP deposits despite the presence of surrounding astrocytes. Clusterin expression in astrocytes was not disease specific, but the punctate immunoreactivity for clusterin was more prominently demonstrated in TSEs with punctate PrP deposits. Serial analysis in the mouse model of human TSE revealed that clusterin expression in astrocytes was enhanced in the lesions with punctate-type PrP deposits during the disease progression. Thus, the induction of clusterin expression in astrocytes could be more enhanced by punctate-type PrP deposits than by plaque-type deposits. The clusterin molecules co-localized in plaque PrP deposits might be derived not from surrounding astrocytes but from other resources such as cerebrospinal fluid...Continue Reading

Citations

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