title: Induction of matrix metalloproteinase MMP-9 (92-kDa gelatinase) by retinoic acid in human neuroblastoma SKNBE cells: relevance to neuronal differentiation.
abstract: Retinoic acid (RA) has been shown to induce human neuroblastoma SKNBE cell differentiation into a neuronal phenotype. Whether this neuronal differentiation is associated with modulation of matrix gelatinase [matrix metalloproteinase (MMP)-2 and MMP-9] expression was investigated in SKNBE cell cultures exposed to RA for 14 days. Their differentiation into a neuronal phenotype was typified by neural cell adhesion molecule and growth-associated protein-43 expression. Gelatinase expression was assessed by gel zymography, quantitative RT-PCR, and immunocytochemistry. Neuronal markers were located in neurites and ganglion-like clusters of neuronal cells induced upon RA exposure. MMP-2 expression was constitutive and remained unchanged at both the mRNA and protein levels in response to RA, tumor necrosis factor-alpha (TNFalpha), or phorbol 12-myristate 13-acetate (PMA) treatment. In contrast, MMP-9 was inducible by RA, TNFalpha, or PMA. MMP-9 was progressively enhanced by RA as a function of time exposure until day 14. The addition of TNFalpha or PMA potentiated RA-induced MMP-9 expression with a synergic maximal effect at day 14 of RA exposure. Immunoreactive MMP-9 was located early in outgrowing neurites, but only at day 14 of RA exposure in extensive neuritic networks. Taken together, the correlation between the MMP-9 expression by SKNBE cells and the time scale of their differentiation into a neuronal phenotype allowed us to propose that MMP-9 could participate in the neurite growth process and cell migration and organization into ganglion-like clusters.
authors.affiliation: INSERM U282, Hôpital Henri Mondor, Créteil, France.
authors.forename: A M
authors.initials: AM
authors.lastname: Chambaut-Guérin
authors.forename: S
authors.initials: S
authors.lastname: Hérigault
authors.forename: P
authors.initials: P
authors.lastname: Rouet-Benzineb
authors.forename: C
authors.initials: C
authors.lastname: Rouher
authors.forename: C
authors.initials: C
authors.lastname: Lafuma
mesh_terms: D002454:Cell Differentiation / Q000502:physiology; D004790:Enzyme Induction; D019922:GAP-43 Protein / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D019006:Neural Cell Adhesion Molecules / Q000378:metabolism; D009447:Neuroblastoma / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology; D009474:Neurons / Q000473:pathology; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism / Q000494:pharmacology
chemical_list: D019922:GAP-43 Protein; D019006:Neural Cell Adhesion Molecules; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D014212:Tretinoin; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D013755:Tetradecanoylphorbol Acetate