title: Knockdown of annexin 2 decreases migration of human glioma cells in vitro.
abstract: Diffuse invasion of brain tissue is a major reason for the poor prognosis of patients with glioblastoma. Annexin 2, a member of the large annexin family of Ca2+ and membrane-binding proteins, is expressed at high protein levels in human gliomas and has been proposed as a marker of glioma malignancy, while its functional role in these tumours is unknown so far. The ability of annexin 2 to interact with the actin cytoskeleton, as well as its potential to bind invasion-associated proteases, suggests that it could participate in invasion-associated processes in human gliomas. Therefore, we analysed here functional consequences of RNA interference-mediated silencing of annexin 2 in U87MG and U373MG human glioma cell lines. While no impact of annexin 2 downregulation on proliferation and adhesion was observed, our analyses revealed that migration of U87MG and U373MG cells was significantly inhibited following annexin 2 depletion. This effect was not related to a compensatory increase of the related annexins 1 or 6. Our findings identify annexin 2 as a potential candidate involved in glioma invasion and support the potential of RNA interference as powerful tool in the decryption of glioma invasion mechanisms.
authors.affiliation: Institute of Neuropathology, University Hospital Muenster, Muenster, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Tatenhorst
authors.forename: U
authors.initials: U
authors.lastname: Rescher
authors.forename: V
authors.initials: V
authors.lastname: Gerke
authors.forename: W
authors.initials: W
authors.lastname: Paulus
mesh_terms: D017306:Annexin A2 / Q000378:metabolism*; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000378:metabolism / Q000473:pathology*; D002448:Cell Adhesion; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000502:physiology*; D015536:Down-Regulation; D005910:Glioma / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D009361:Neoplasm Invasiveness; D034741:RNA, Small Interfering; D014162:Transfection
chemical_list: C472822:ANXA2 protein, human; D017306:Annexin A2; D034741:RNA, Small Interfering