ノズミ　モトヒロ   野住　素広    所属   新潟薬科大学  医療技術学部 臨床検査学科    職種   教授
言語種別	英語
発行・発表の年月	2017/04/12
形態種別	論文 - 研究論文（学術雑誌）
査読	査読あり
標題	Extracellular Signals Induce Glycoprotein M6a Clustering of Lipid Rafts and Associated Signaling Molecules.
執筆形態	その他 - 指定なし
掲載誌名	The Journal of neuroscience : the official journal of the Society for Neuroscience
掲載区分	国外
巻・号・頁	37(15),pp.4046-4064
著者・共著者	Atsuko Honda,Yasuyuki Ito,Kazuko Takahashi-Niki,Natsuki Matsushita,Motohiro Nozumi,Hidenori Tabata,Kosei Takeuchi,Michihiro Igarashi
概要	Lipid raft domains, where sphingolipids and cholesterol are enriched, concentrate signaling molecules. To examine how signaling protein complexes are clustered in rafts, we focused on the functions of glycoprotein M6a (GPM6a), which is expressed at a high concentration in developing mouse neurons. Using imaging of lipid rafts, we found that GPM6a congregated in rafts in a GPM6a palmitoylation-dependent manner, thereby contributing to lipid raft clustering. In addition, we found that signaling proteins downstream of GPM6a, such as Rufy3, Rap2, and Tiam2/STEF, accumulated in lipid rafts in a GPM6a-dependent manner and were essential for laminin-dependent polarity during neurite formation in neuronal development. In utero RNAi targeting of GPM6a resulted in abnormally polarized neurons with multiple neurites. These results demonstrate that GPM6a induces the clustering of lipid rafts, which supports the raft aggregation of its associated downstream molecules for acceleration of neuronal polarity determination. Therefore, GPM6a acts as a signal transducer that responds to extracellular signals.SIGNIFICANCE STATEMENT Lipid raft domains, where sphingolipids and cholesterol are enriched, concentrate signaling molecules. We focused on glycoprotein M6a (GPM6a), which is expressed at a high concentration in developing neurons. Using imaging of lipid rafts, we found that GPM6a congregated in rafts in a palmitoylation-dependent manner, thereby contributing to lipid raft clustering. In addition, we found that signaling proteins downstream of GPM6a accumulated in lipid rafts in a GPM6a-dependent manner and were essential for laminin-dependent polarity during neurite formation. In utero RNAi targeting of GPM6a resulted in abnormally polarized neurons with multiple neurites. These results demonstrate that GPM6a induces the clustering of lipid rafts, which supports the raft aggregation of its associated downstream molecules for acceleration of polarity determination. Therefore, GPM6a acts as a signal transducer that responds to extracellular signals.
DOI	10.1523/JNEUROSCI.3319-16.2017
PMID	28275160