Phospholipase D1 Increases Bcl-2 Expression During Neuronal Differentiation of Rat Neural Stem Cells

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• 作者：Shin-Young Park ; Weina Ma ; Sung Nyo Yoon ; Min Jeong Kang…
• 关键词：Phospholipase D1 ; Bcl ; 2 ; Neural differentiation ; Neural stem cells
• 刊名：Molecular Neurobiology
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：51
• 期：3
• 页码：1089-1102
• 全文大小：2,771 KB
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• 作者单位：Shin-Young Park (1)
  Weina Ma (1)
  Sung Nyo Yoon (1)
  Min Jeong Kang (1)
  Joong-Soo Han (1)
  
  1. Department of Biochemistry and Molecular Biology, College of Medicine, Hanyang University, 17 Haengdang-Dong, Sungdong-Gu, Seoul, 133-791, Republic of Korea
  
• 刊物主题：Neurosciences; Neurobiology; Cell Biology; Neurology;
• 出版者：Springer US
• ISSN：1559-1182

文摘

We studied the possible role of phospholipase D1 (PLD1) in the neuronal differentiation, including neurite formation of neural stem cells. PLD1 protein and PLD activity increased during neuronal differentiation. Bcl-2 also increased. Downregulation of PLD1 by transfection with PLD1 siRNA or a dominant-negative form of PLD1 (DN-PLD1) inhibited both neurite outgrowth and Bcl-2 expression. PLD activity was dramatically reduced by a PLCγ (phospholipase Cγ) inhibitor (U73122), a Ca2+chelator (BAPTA-AM), and a PKCα (protein kinase Cα) inhibitor (RO320432). Furthermore, treatment with arachidonic acid (AA) which is generated by the action of PLA2 (phospholipase A2) on phosphatidic acid (a PLD1 product), increased the phosphorylation of p38 MAPK and CREB, as well as Bcl-2 expression, indicating that PLA2 is involved in the differentiation process resulting from PLD1 activation. PGE2 (prostaglandin E2), a cyclooxygenase product of AA, also increased during neuronal differentiation. Moreover, treatment with PGE2 increased the phosphorylation of p38 MAPK and CREB, as well as Bcl-2 expression, and this effect was inhibited by a PKA inhibitor (Rp-cAMP). As expected, inhibition of p38 MAPK resulted in loss of CREB activity, and when CREB activity was blocked with CREB siRNA, Bcl-2 production also decreased. We also showed that the EP4 receptor was required for the PKA/p38MAPK/CREB/Bcl-2 pathway. Taken together, these observations indicate that PLD1 is activated by PLCγ/PKCα signaling and stimulate Bcl-2 expression through PLA2/Cox2/EP4/PKA/p38MAPK/CREB during neuronal differentiation of rat neural stem cells.