title: Endosialin/TEM-1/CD248 regulates pericyte proliferation through PDGF receptor signaling.
abstract: Recent reports have described several cellular phenotypes that appear to be mediated by Endosialin/TEM-1/CD248 (TEM-1), including tubule formation on matrigel, migration and proliferation. It has been shown that siRNA knock-down of TEM-1 in primary human fibroblasts resulted in reduced proliferation. However, the downstream signaling events that mediate TEM-1 function(s) currently remain unknown. In this study, we demonstrate that TEM-1 mediates proliferation of primary human pericytes through a PDGF receptor signaling pathway. Normal pericytes expressing high levels of TEM-1 were able to proliferate, respond to PDGF-BB stimulation by phosphorylating both the PDGF receptor and the MAP kinase ERK-1/2, and induce the expression of the immediate early transcription factor c-Fos. However, when TEM-1 expression was knocked-down, PDGF-BB-induced proliferation, ERK-1/2 phosphorylation, and c-Fos expression were significantly impaired. Thus, our results provide evidence for a TEM-1-dependent signal pathway that controls proliferation of human pericytes and suggest targeting this pathway for future strategies aimed at mitigating tumor angiogenesis.
authors.affiliation: Morphotek, Inc., Exton, PA, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Tomkowicz
authors.forename: Katherine
authors.initials: K
authors.lastname: Rybinski
authors.forename: Denise
authors.initials: D
authors.lastname: Sebeck
authors.forename: Philip
authors.initials: P
authors.lastname: Sass
authors.forename: Nicolas C
authors.initials: NC
authors.lastname: Nicolaides
authors.forename: Luigi
authors.initials: L
authors.lastname: Grasso
authors.forename: Yuhong
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism*; D000951:Antigens, Neoplasm / Q000235:genetics / Q000378:metabolism*; D000077214:Becaplermin; D015153:Blotting, Western; D002460:Cell Line; D049109:Cell Proliferation; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D019950:Mitogen-Activated Protein Kinase 1 / Q000235:genetics / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000235:genetics / Q000378:metabolism; D008954:Models, Biological; D020286:Pericytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics / Q000378:metabolism; D020574:Proto-Oncogene Proteins c-sis; D034622:RNA Interference; D017479:Receptors, Platelet-Derived Growth Factor / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction
chemical_list: D015703:Antigens, CD; D000951:Antigens, Neoplasm; C078203:CD248 protein, human; D010982:Platelet-Derived Growth Factor; D016760:Proto-Oncogene Proteins c-fos; D020574:Proto-Oncogene Proteins c-sis; D000077214:Becaplermin; D017479:Receptors, Platelet-Derived Growth Factor; C535150:MAPK1 protein, human; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3