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Volume 16, Number 22, Issue of November 15, 1996 pp. 7161-7170
Copyright ©1996 Society for Neuroscience

Modulatory Role of Drebrin on the Cytoskeleton within Dendritic Spines in the Rat Cerebral Cortex

Received Feb. 22, 1996; revised Aug. 29, 1996; accepted Aug. 30, 1996.

Kensuke Hayashi¹, Ryoki Ishikawa², Li-Hong Ye², Xiao-Ling He¹, Kuniaki Takata³, Kazuhiro Kohama², and Tomoaki Shirao¹

Departments of ¹ Neurobiology and Behavior and ² Pharmacology, Gunma University School of Medicine, and ³ Laboratory of Molecular and Cellular Morphology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma 371, Japan

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

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