Expression and role of the cell surface protease seprase/fibroblast activation protein-α (FAP-α) in astroglial tumors.
Seprase or fibroblast activation protein-α (FAP-α) is a cell-surface serine protease that was previously described nearly exclusively on reactive and tumor stromal fibroblasts and thought to be involved in tissue remodeling. We investigated the expression and significance of FAP-α in astrocytomas/glioblastomas. As shown by quantitative reverse transcription polymerase chain reaction (RT-PCR) and immunohistochemistry, FAP-α was elevated in whole glioblastoma tissues and in particular in most glioma cells in situ and in vitro. In glioma stem-like cells (gliospheres), FAP-α was detected at low levels; however, FAP-α was considerably induced upon differentiation with 10% fetal calf serum. To explore its functional role, FAP-α was silenced by siRNA transfection. In Boyden chamber assays, FAP-α silenced cells migrated similar as control cells through non-coated or Matrigel (basal lamina)-coated porous membranes, but significantly slower through membranes coated with gelatin or brevican, a major component of brain extracellular matrix. Furthermore, FAP-α-silenced glioma cells migrated through murine brain slices much slower under the conditions tested than differentially fluorescent-labeled control cells. Thus, FAP-α is highly expressed on the surface of glioma cells and contributes to diffuse glioma invasion through extracellular matrix components.
Mentlein
Rolf
R
Department of Anatomy, University of Kiel, D-24098 Kiel, Germany. rment@anat.uni-kiel.de
Hattermann
Kirsten
K
Hemion
Charles
C
Jungbluth
Achim A
AA
Held-Feindt
Janka
J
D001254:Astrocytoma / Q000201:enzymology* / Q000473:pathology; D001932:Brain Neoplasms / Q000201:enzymology* / Q000473:pathology; D058581:Brevican / Q000378:metabolism; D045744:Cell Line, Tumor; D018819:Dipeptidyl Peptidase 4 / Q000378:metabolism; D010450:Endopeptidases; D018093:Gelatinases / Q000378:metabolism*; D055785:Gene Knockdown Techniques; D005909:Glioblastoma / Q000201:enzymology* / Q000473:pathology; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism*; D009361:Neoplasm Invasiveness; D014411:Neoplastic Stem Cells / Q000201:enzymology; D012333:RNA, Messenger / Q000096:biosynthesis; D034741:RNA, Small Interfering; D012697:Serine Endopeptidases / Q000378:metabolism*; D000099167:Fibroblast Activation Protein Alpha
D058581:Brevican; D018819:Dipeptidyl Peptidase 4; D010450:Endopeptidases; D018093:Gelatinases; D008565:Membrane Proteins; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D012697:Serine Endopeptidases; D000099167:Fibroblast Activation Protein Alpha