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Neuron-enriched phosphatase and actin regulator 3 (Phactr3)/ nuclear scaffold-associated PP1-inhibiting protein (Scapinin) regulates dendritic morphology via its protein phosphatase 1-binding domain.

Biochem Biophys Res Commun. 2020 Jul 23;528(2):322-329. Epub 2020 May 15
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摘要


Phosphatase and actin regulator 3/nuclear scaffold-associated protein phosphatase 1-inhibiting protein (Phactr3/Scapinin) is an actin- and protein phosphatase 1 (PP1)-binding protein known to negatively regulate axon elongation. In this study, we examined the expression pattern of Phactr3/Scapinin in several tissues and investigated the effect of Phactr3/Scapinin on dendritic morphology of cortical neurons. Results showed that Phactr3/Scapinin expression was up-regulated in the developing brain and enriched in neurons and in the postsynaptic density fraction, but not in astrocytes. Overexpression of wild type or mutant Phactr3/Scapinin, which lacked actin-binding activity, resulted in increased dendritic complexity and percentage of spines with a mushroom or stubby shape, as well as a decrease in spine density. However, overexpression of mutant Phactr3/Scapinin that lacked PP1-binding activity did not. Taken together, these findings suggest that Phactr3/Scapinin expression is neuronal and might contribute to synaptic formation via distinct actin- and PP1-binding domains involved in dendritic and axonal morphology, respectively.

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