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Detail of Fig2a_WT_180221_area5

Shinji Tanaka, Yasutaka Masuda, Akihiro Harada, Shigeo Okabe (2020) Impaired actin dynamics and suppression of Shank2-mediated spine enlargement in cortactin knockout mice., Microscopy (Oxford, England), Volume 69, Number 1, pp. 44-52

Published in 2020 Mar 9

• doi: 10.1093/jmicro/dfaa001
• pmid: 31990031
  

(Abstract) Cortactin regulates actin polymerization and stabilizes branched actin network. In neurons, cortactin is enriched in dendritic spines that contain abundant actin polymers. To explore the function of cortactin in dendritic spines, we examined spine morphology and dynamics in cultured neurons taken from cortactin knockout (KO) mice. Histological analysis revealed that the density and morphology of dendritic spines were not significantly different between wild-type (WT) and cortactin KO neurons. Time-lapse imaging of hippocampal slice cultures showed that the extent of spine volume change was similar between WT and cortactin KO neurons. Despite little effect of cortactin deletion on spine morphology and dynamics, actin turnover in dendritic spines was accelerated in cortactin KO neurons. Furthermore, we detected a suppressive effect of cortactin KO on spine head size under the condition of excessive spine enlargement induced by overexpression of a prominent postsynaptic density protein Shank2. These results suggest that cortactin may have a role in maintaining actin organization by stabilizing actin filaments near the postsynaptic density.

• Actins/physiology[major]
• Animals
• Cells, Cultured
• Cortactin/genetics[major]
• Dendritic Spines/physiology[major]
• Dendritic Spines/ultrastructure
• Hippocampus
• Mice
• Mice, Inbred C57BL
• Mice, Knockout
• Nerve Tissue Proteins/genetics[major]
• Neurons/physiology[major]
• Time-Lapse Imaging