title: Transient RNA silencing of tissue factor pathway inhibitor-2 modulates lung cancer cell invasion.
abstract: Tissue Factor Pathway Inhibitor-2 (TFPI-2) is a potent inhibitor of plasmin which activates metalloproteinases (MMPs) involved in extracellular matrix (ECM) degradation. Its secretion in ECM makes TFPI-2 a potential inhibitor to regulate tumour invasion and metastasis. Moreover, TFPI-2 is frequently downregulated, particularly in aggressive cancers. In this study, we silenced TFPI-2 in the NCI-H460 non-small cell lung cancer cell line and evaluated the role of TFPI-2 in cell invasion and its impact on MMPs expression. As the effects of siRNA are transient, the consequences of both gene silencing and restoration to normal expression could be studied kinetically in the same cells. We showed that TFPI-2 expression by NCI-H460 cells was effectively downregulated using specific small interfering RNA and this silencing was associated with an increase in the invasive potential of tumour cells while migration was not affected. We also showed that mRNA levels and protein expression of MMP-2, -3, -9, -14 were not influenced by TFPI-2 silencing. Moreover, the gelatinase activity of MMP-2 and MMP-9 was unmodified. In contrast, MMP-1 mRNA levels and protein were significantly and similarly increased in cells transfected with TFPI-2 siRNA. In conclusion, this study confirms that TFPI-2 downregulation can contribute to tumour invasion of lung cancer cells.
authors.affiliation: Inserm U618, Protéases et Vectorisation Pulmonaires, Faculté de Médecine, Université François Rabelais, IFR 135, 10 Boulevard Tonnellé, 37032, Tours Cedex, France. iochmann@med.univ-tours.fr
authors.forename: Sophie
authors.initials: S
authors.lastname: Iochmann
authors.forename: Claire
authors.initials: C
authors.lastname: Bléchet
authors.forename: Valérie
authors.initials: V
authors.lastname: Chabot
authors.forename: Annabelle
authors.initials: A
authors.lastname: Saulnier
authors.forename: Aniça
authors.initials: A
authors.lastname: Amini
authors.forename: Guillaume
authors.initials: G
authors.lastname: Gaud
authors.forename: Yves
authors.initials: Y
authors.lastname: Gruel
authors.forename: Pascale
authors.initials: P
authors.lastname: Reverdiau
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D002465:Cell Movement; D015536:Down-Regulation; D005109:Extracellular Matrix / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D020868:Gene Silencing; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D009361:Neoplasm Invasiveness; D012313:RNA / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000378:metabolism
chemical_list: D006023:Glycoproteins; D034741:RNA, Small Interfering; C021240:tissue-factor-pathway inhibitor 2; D012313:RNA; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9