The secretion of the angiogenic and neurotrophic factor angiogenin is COPII and microtubule dependent

Ross Ferguson, Vasanta Subramanian

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The RNaseA superfamily member Angiogenin (ANG)is a secreted protein involved in neovascularization, cell proliferation and stress response. Dysregulation of ANG expression is found in many cancers with poor prognosis and mutations in ANG are associated with neurodegenerative diseases. While the uptake and nuclear translocation of ANG is relatively well characterised, little is known about how it reaches the plasma membrane and its mode of secretion. We generated SH-SY5Y neuroblastoma cell lines constitutively expressing wild type (WT)Hemagglutinin (HA)epitope tagged mouse Ang1 (mAng1), and two amyotrophic lateral sclerosis associated ANG variants (C39W and K40I). Herein, we show that these cell lines secrete mAng1 into the culture media. Using small molecule inhibitors we probed the route taken between the endoplasmic reticulum and trans-Golgi network during secretion and have characterised it as COPII and microtubule dependent. In addition, we show that disruption by the PI3-kinase inhibitor wortmannin of the later stages of transit to the plasma membrane leads to mAng1 trafficking to lysosomal compartments. This suggests an autophagy dependent regulation of secretion.

Original languageEnglish
Pages (from-to)265-279
Number of pages15
JournalExperimental Cell Research
Issue number2
Early online date22 May 2019
Publication statusPublished - 15 Aug 2019


  • Angiogenin
  • Epitope tag
  • Secretion
  • SH-SY5Y
  • Small molecule inhibitors. microtubule

ASJC Scopus subject areas

  • Cell Biology


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