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- W2099046597 abstract "Amyloid beta-protein (A beta), the principal constituent of the senile plaques seen in Alzheimer's disease (AD), is derived by proteolysis from the beta-amyloid precursor protein (beta PP). The distribution and trafficking of cell surface beta PP are of particular interest because some of these molecules are direct precursors of secreted A beta and because the localization of beta PP at the cell surface may be related directly to its physiological functions. Recently, we reported that, in cultured hippocampal neurons, cell surface beta PP is preferentially expressed on axons in a striking discontinuous pattern. In this study, we describe the colocalization of cell surface beta PP and integrins in primary cultured cells. In rat hippocampal neurons, cell surface beta PP was colocalized selectively with alpha 1 beta 1 and alpha 5 beta 1 integrin heterodimers at these characteristic segmental locations. In rat cortical astrocytes, both cell surface beta PP and beta 1 integrin were located at the cell periphery in the spreading stage shortly after plating. In flattened astrocytes cultured for several days, beta PP was found in punctate deposits called point contacts. In these sites, beta PP was colocalized with alpha 1 beta 1, but not with alpha 5 beta 1 integrin heterodimers, the latter of which were situated at focal contact sites. In both neurons and astrocytes examined after shearing, clathrin and alpha-adaptin were colocalized with beta PP on the surface that directly contacts the substratum. These results are consistent with the putative role of beta PP in cell adhesion and suggests that beta PP either interacts with selected integrins or shares similar cellular machinery to promote cell adhesion." @default.
- W2099046597 created "2016-06-24" @default.
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- W2099046597 date "1997-02-01" @default.
- W2099046597 modified "2023-10-13" @default.
- W2099046597 title "Cell surface amyloid beta-protein precursor colocalizes with beta 1 integrins at substrate contact sites in neural cells." @default.
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