کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2199044 1099422 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Identification of a caspase-derived N-terminal tau fragment in cellular and animal Alzheimer's disease models
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیولوژی سلول
پیش نمایش صفحه اول مقاله
Identification of a caspase-derived N-terminal tau fragment in cellular and animal Alzheimer's disease models
چکیده انگلیسی

Biochemical modifications of tau proteins have been proposed to be among the earliest neurobiological changes in Alzheimer's disease (AD) and correlate better with cognitive symptoms than do beta-amyloid plaques. We have recently reported that adenovirus-mediated overexpression of the NH2 26–230aa tau fragment evokes a potent NMDA-mediated neurotoxic effect in primary neuronal cultures. In order to assess whether such N-terminal tau fragment(s) are indeed produced during apoptosis or neurodegeneration in vivo, we attempted to ascertain their presence in cell and animal models using an anti-tau antibody directed against the N-terminal sequence of human protein located downstream of the caspase(s)-cleavage site DRKD25-QGGYTMHQDQ. We provide biochemical evidence that a caspase(s)-cleaved NH2-terminal tau fragment of 20–22 kDa, consistent with the size of the NH2 26–230aa neurotoxic fragment of tau, is generated in vitro in differentiated human SH-SY5Y cells undergoing apoptosis by BDNF withdrawal or following treatment with staurosporine. In addition this NH2-terminally cleaved tau fragment, whose expression correlates with a significant up-regulation of caspase(s) activity, is also specifically detected in vivo in the hippocampus of 15 month-old AD11 transgenic mice, a model in which a progressive AD-like neurodegeneration is induced by the expression of transgenic anti-NGF antibodies. The results support the idea that aberrant activation of caspase(s), following apoptotic stimuli or neurodegeneration insults, may produce one or more toxic NH2 tau fragments, that further contribute to propagate and increase cellular dysfunctions in AD.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular and Cellular Neuroscience - Volume 38, Issue 3, July 2008, Pages 381–392
نویسندگان
, , , , , , , , , , ,