Delta-catenin-induced dendritic morphogenesis. An essential role of p190RhoGEF interaction through Akt1-mediated phosphorylation |
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Authors: | Kim Hangun Han Jeong-Ran Park Jaejun Oh Minsoo James Sarah E Chang Sunghoe Lu Qun Lee Kwang Youl Ki Hyunkyoung Song Woo-Joo Kim Kwonseop |
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Institution: | College of Pharmacy and Research Institute of Drug Development, Chonnam National University, Gwangju 500-757, Korea. |
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Abstract: | Delta-catenin was first identified through its interaction with Presenilin-1 and has been implicated in the regulation of dendrogenesis and cognitive function. However, the molecular mechanisms by which delta-catenin promotes dendritic morphogenesis were unclear. In this study, we demonstrated delta-catenin interaction with p190RhoGEF, and the importance of Akt1-mediated phosphorylation at Thr-454 residue of delta-catenin in this interaction. We have also found that delta-catenin overexpression decreased the binding between p190RhoGEF and RhoA, and significantly lowered the levels of GTP-RhoA but not those of GTP-Rac1 and -Cdc42. Delta-catenin T454A, a defective form in p190RhoGEF binding, did not decrease the binding between p190RhoGEF and RhoA. Delta-catenin T454A also did not lower GTP-RhoA levels and failed to induce dendrite-like process formation in NIH 3T3 fibroblasts. Furthermore, delta-catenin T454A significantly reduced the length and number of mature mushroom shaped spines in primary hippocampal neurons. These results highlight signaling events in the regulation of delta-catenin-induced dendrogenesis and spine morphogenesis. |
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