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Metformin Mitigates Nickel-Elicited Angiopoietin-Like Protein 4 Expression via HIF-1α for Lung Tumorigenesis.
- Source :
-
International journal of molecular sciences [Int J Mol Sci] 2020 Jan 17; Vol. 21 (2). Date of Electronic Publication: 2020 Jan 17. - Publication Year :
- 2020
-
Abstract
- Nickel (Ni), which is a carcinogenic workplace hazard, increases the risk of lung cancer. Angiopoietin-like protein 4 (ANGPTL4) is a multifunctional cytokine that is involved in both angiogenesis and metastasis, but its role in lung cancer is still not clear. In this study, we assessed the role of ANGPTL4 in lung carcinogenesis under nickel exposure and investigated the effects of the antidiabetic drug metformin on ANGPTL4 expression and lung cancer chemoprevention. Our results showed that ANGPTL4 is increased in NiCl <subscript>2</subscript> -treated lung cells in a dose- and time-course manner. The expression of ANGPTL4 and HIF-1α induced by NiCl <subscript>2</subscript> were significantly repressed after metformin treatment. The downregulation of HIF-1α expression by ROS savenger and HIF-1α inhibitor or knockdown by lentiviral shRNA infection diminished NiCl <subscript>2</subscript> -activated ANGPTL4 expression. Chromatin immunoprecipitation and the luciferase assay revealed that NiCl <subscript>2</subscript> -induced HIF-1α hypoxia response element interactions activate ANGPTL4 expression, which is then inhibited by metformin. In conclusion, the increased presence of ANGPTL4 due to HIF-1α accumulation that is caused by nickel in lung cells may be one mechanism by which nickel exposure contributes to lung cancer progression. Additionally, metformin has the ability to prevent NiCl <subscript>2</subscript> -induced ANGPTL4 through inhibiting HIF-1α expression and its binding activity. These results provide evidence that metformin in oncology therapeutics could be a beneficial chemopreventive agent.
- Subjects :
- Angiopoietin-Like Protein 4 genetics
Apoptosis
Biomarkers, Tumor genetics
Biomarkers, Tumor metabolism
Cell Proliferation
Cell Transformation, Neoplastic metabolism
Cell Transformation, Neoplastic pathology
Humans
Hypoglycemic Agents pharmacology
Hypoxia-Inducible Factor 1, alpha Subunit genetics
Lung Neoplasms chemically induced
Lung Neoplasms metabolism
Lung Neoplasms pathology
Neovascularization, Pathologic
Trace Elements adverse effects
Tumor Cells, Cultured
Angiopoietin-Like Protein 4 metabolism
Cell Transformation, Neoplastic drug effects
Gene Expression Regulation, Neoplastic drug effects
Hypoxia-Inducible Factor 1, alpha Subunit metabolism
Lung Neoplasms prevention & control
Metformin pharmacology
Nickel adverse effects
Subjects
Details
- Language :
- English
- ISSN :
- 1422-0067
- Volume :
- 21
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- International journal of molecular sciences
- Publication Type :
- Academic Journal
- Accession number :
- 31963541
- Full Text :
- https://doi.org/10.3390/ijms21020619