title: Over-expression of CD9 does not affect in vivo tumorigenic or metastatic properties of human prostate cancer cells.
abstract: Expression of tetraspanin CD9 protein is downregulated in many tumors. CD9 over-expression also reduces the tumorigenicity of some human cancer cells. Here, we determined if exogenous expression of CD9 affects the properties of human prostate cancer cells. Highly metastatic prostate cancer cells PC-3M-LN4 over-expressing exogenous CD9 were orthotopically injected into the prostate of nude mice. CD9 expression was determined in tumors using PCR and Western immunoblotting techniques. Over-expression of CD9 increased invasiveness of prostate cancer cells in vitro. Animals injected with either parental PC-3M-LN4 or CD9-transfected cells developed tumor and harbored lymph node metastasis. There was no statistical difference in tumor growth between the two cell lines. CD9 did not suppress tumorigenic or metastatic properties of PC-3M-LN4 cells. Our data contrast with published results in other tumor types and likely indicate that other proteins (CD9 partners) are needed for CD9 full anti-tumorigenic action.
authors.affiliation: Department of Medicine, Division of Experimental Medicine, McGill University, The Research Institute of the McGill University Health Centre, Montreal, Que., Canada.
authors.forename: Valerii
authors.initials: V
authors.lastname: Zvieriev
authors.forename: Jia-Chi
authors.initials: JC
authors.lastname: Wang
authors.forename: Mario
authors.initials: M
authors.lastname: Chevrette
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D001483:Base Sequence; D005786:Gene Expression Regulation; D006801:Humans; D007267:Injections; D008207:Lymphatic Metastasis / Q000235:genetics / Q000473:pathology; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D051379:Mice; D008819:Mice, Nude; D008969:Molecular Sequence Data; D009362:Neoplasm Metastasis / Q000473:pathology; D009368:Neoplasm Transplantation / Q000473:pathology; D011471:Prostatic Neoplasms / Q000473:pathology*; D060245:Tetraspanin 29; D013997:Time Factors; D014407:Tumor Cells, Cultured
chemical_list: D015703:Antigens, CD; C554869:CD9 protein, human; C554870:Cd9 protein, mouse; D008562:Membrane Glycoproteins; D060245:Tetraspanin 29