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J Neurosci. 2003 Jan 1;23(1):1-6.

Actin-ATP hydrolysis is a major energy drain for neurons.

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  • 1Department of Biochemistry and Molecular Biology and the Program in Molecular, Cellular, and Integrative Neuroscience, Colorado State University, Fort Collins, Colorado 80523-1870, USA. bwb@lamar.colostate.edu


In cultured chick ciliary neurons, when ATP synthesis is inhibited, ATP depletion is reduced approximately 50% by slowing actin filament turnover with jasplakinolide or latrunculin A. Jasplakinolide inhibits actin disassembly, and latrunculin A prevents actin assembly by sequestering actin monomers. Cytochalasin D, which allows assembly-disassembly, but only at pointed ends, is less effective in conserving ATP. Ouabain, an Na(+)-K(+)-ATPase inhibitor, and jasplakinolide both prevent approximately 50% of the ATP loss. When applied together, they completely prevent ATP loss over a period of 20 min, suggesting that filament stabilization reduces ATP consumption by decreasing actin-ATP hydrolysis directly rather than indirectly by modulating the activity of Na(+)-K(+)-ATPase, a major energy consumer.

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