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Modulatory role of drebrin on the cytoskeleton within dendritic spines in the rat cerebral cotex

By Kensuke Hayashi, Ryoki Ishikawa, Li-hong Ye, Xiao-ling He, Kuniaki Takata, Kazuhiro Kohama and Tomoaki Shirao


Morphological changes in the dendritic spines have been postulated to participate in the expression of synaptic plasticity. The cytoskeleton is likely to play a key role in regulating spine structure. Here we examine the molecular mechanisms responsible for the changes in spine morphology, focusing on drebrin, an actin-binding protein that is known to change the properties of actin filaments. We found that adult-type drebrin is localized in the dendritic spines of rat forebrain neurons, where it binds to the cytoskeleton. To identify the cytoskeletal proteins that associated with drebrin, we isolated drebrin-containing cytoskeletons using immunoprecipitation with a drebrin antibody. Drebrin, actin, myosin, and gelsolin were co-precipitated. We next examined the effect of drebrin on actomyosin interaction. In vitro, drebrin reduced the sliding velocity of actin filaments on immobilized myosin and inhibited the actin-activated ATPase activity of myosin. These results suggest that drebrin may modulate the actomyosin interaction within spines and may play a role in the structure-based plasticity of synapses. Key words: spine; synapse; cytoskeleton; plasticity; actomyosin; drebrin A dendritic spine is a dynamic structure that is extremely responsive to changes in ambient conditions (for review, see Koch and Zador, 1993). The shape of spines changes during neuronal developmen

Topics: Harris and Stevens, 1989, Harris et al, 1992, Papa et
Year: 1996
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