1. Transient RNA silencing of tissue factor pathway inhibitor-2 modulates lung cancer cell invasion
- Author
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Annabelle Saulnier, Valérie Chabot, Aniça Amini, C. Blechet, Guillaume Gaud, P. Reverdiau, Yves Gruel, and Sophie Iochmann
- Subjects
Cancer Research ,Small interfering RNA ,Lung Neoplasms ,Down-Regulation ,Biology ,Downregulation and upregulation ,Cell Movement ,Carcinoma, Non-Small-Cell Lung ,Cell Line, Tumor ,Gene silencing ,Humans ,Neoplasm Invasiveness ,Gene Silencing ,RNA, Small Interfering ,education ,Glycoproteins ,Regulation of gene expression ,education.field_of_study ,General Medicine ,Transfection ,Tissue-factor-pathway inhibitor 2 ,Cell biology ,Extracellular Matrix ,Gene Expression Regulation, Neoplastic ,RNA silencing ,Oncology ,Matrix Metalloproteinase 9 ,Cell culture ,Matrix Metalloproteinase 2 ,RNA - 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.
- Published
- 2008