Possible role of scavenger receptor SRCL in the clearance of amyloid-beta in Alzheimer's disease |
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Authors: | Nakamura Kenji Ohya Wakana Funakoshi Hiroshi Sakaguchi Gaku Kato Akira Takeda Masatoshi Kudo Takashi Nakamura Toshikazu |
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Institution: | Department of Biochemistry andMolecular Biology, Division of Molecular Regenerative Medicine, Osaka University Graduate School of Medicine, Osaka, Japan. nakamura@onbich.med.osaka-u.ac.jp |
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Abstract: | Accumulation of beta-amyloid protein (Abeta) in the brain is a hallmark of Alzheimer's disease (AD), and Abeta-mediated pathogenesis could result from increased production of Abeta or insufficient Abeta clearance by microglia, astrocytes, or the vascular system. Cell-surface receptors, such as scavenger receptors, might play a critical role in the binding and clearing of Abeta; however, the responsible receptors have yet to be identified. We show that scavenger receptor with C-type lectin (SRCL), a member of the scavenger receptor family containing coiled-coil, collagen-like, and C-type lectin/carbohydrate recognition domains, is expressed in cultured astrocytes and microglia. In contrast to the low expression of SRCL in the wild-type mouse brain, in a double transgenic mouse model of AD (Tg-APP/PS1), immunohistochemistry showed that SRCL was markedly induced in Abeta-positive astrocytes and Abeta-positive vascular/perivascular cells, which are associated closely with cerebral amyloid angiopathy. In patients with AD, the distribution of SRCL was similar to that seen in the Tg-APP/PS1 temporal cortex. The presence of a large number of SRCL/Abeta double-positive particles in the intracellular compartments of reactive astrocytes and vascular/perivascular cells in Tg-APP/PS1 mice and AD patients suggests a role for SRCL in Abeta clearance. Moreover, CHO-K1 cells transfected with SRCL isoforms were found to bind fibrillar Abeta(1-42). These findings suggest that SRCL could be the receptor involved in the binding or clearing of Abeta by glial and vascular/perivascular cells in AD. |
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Keywords: | scavenger receptor SRCL amyloid‐β astrocytes microglia |
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