51
|
Xia H, Li Y, Lv X. MicroRNA-107 inhibits tumor growth and metastasis by targeting the BDNF-mediated PI3K/AKT pathway in human non-small lung cancer. Int J Oncol 2016; 49:1325-33. [PMID: 27498977 PMCID: PMC5021252 DOI: 10.3892/ijo.2016.3628] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 07/04/2016] [Indexed: 01/20/2023] Open
Abstract
Abnormal expression of microRNA-107 (miR-107) was found in non-small cell lung cancer (NSCLC). However, little is known about its role and molecular mechanism in NSCLC progression and metastasis. Therefore, the aims of this study were to clarify the potential role of miR-107 and molecular mechanism in NSCLC progression and metastasis. Quantitative real-time polymerase chain reaction assay showed that miR-107 expression levels were significantly decreased in NSCLC tissue and cell lines. Low miR-107 levels in tumor tissue correlated with advanced TNM stage and lymph node metastasis. Function assays showed that overexpression of miR-107 suppressed cell proliferation, migration and invasion in A549 cells in vitro, and inhibited NSCLC tumor growth in vivo. Further mechanism assays suggested the brain-derived neurotrophic factor (BDNF) was identified as a target gene of miR-107 in NSCLC cells. In addition, BDNF expression was upregulated, and inversely correlated with miR-107 in NSCLC tissues. Enforced overexpression of BDNF effectively reversed the tumor suppressive functions of miR-107 on NSCLC proliferation, migration and invasion. miR-107 overexpression or downregulation of BDNF was able to inhibit activation of PI3K/AKT signaling pathway. Taken together, our findings present the first evidence that miR-107 could suppress NSCLC metastasis by targeting BDNF and indirectly regulating PI3K/AKT signaling pathway, which might lead to a potential therapeutic strategy focusing on miR-107 and BDNF for human NSCLC.
Collapse
Affiliation(s)
- Huan Xia
- Department of Respiratory Medicine, The First Hospital of Jilin University, Chaoyang, Changchun, Jilin 130021, P.R. China
| | - Yang Li
- Department of Respiratory Medicine, The First Hospital of Jilin University, Chaoyang, Changchun, Jilin 130021, P.R. China
| | - Xiaohong Lv
- Department of Respiratory Medicine, The First Hospital of Jilin University, Chaoyang, Changchun, Jilin 130021, P.R. China
| |
Collapse
|
52
|
Zhao ZH, Deng B, Xu H, Zhang JF, Mi YJ, Meng XZ, Gou XC, Xu LX. PirB Overexpression Exacerbates Neuronal Apoptosis by Inhibiting TrkB and mTOR Phosphorylation After Oxygen and Glucose Deprivation Injury. Cell Mol Neurobiol 2016; 37:707-715. [PMID: 27443384 DOI: 10.1007/s10571-016-0406-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 07/08/2016] [Indexed: 11/24/2022]
Abstract
Previous studies have proven that paired immunoglobulin-like receptor B (PirB) plays a crucial suppressant role in neurite outgrowth and neuronal plasticity after central nervous system injury. However, the role of PirB in neuronal survival after cerebral ischemic injury and its mechanisms remains unclear. In the present study, the role of PirB is investigated in the survival and apoptosis of cerebral cortical neurons in cultured primary after oxygen and glucose deprivation (OGD)-induced injury. The results have shown that rebarbative PirB exacerbates early neuron apoptosis and survival. PirB gene silencing remarkably decreases early apoptosis and promotes neuronal survival after OGD. The expression of bcl-2 markedly increased and the expression of bax significantly decreased in PirB RNAi-treated neurons, as compared with the control- and control RNAi-treated ones. Further, phosphorylated TrkB and mTOR levels are significantly downregulated in the damaged neurons. However, the PirB silencing markedly upregulates phosphorylated TrkB and mTOR levels in the neurons after the OGD. Taken together, the overexpression of PirB inhibits the neuronal survival through increased neuron apoptosis. Importantly, the inhibition of the phosphorylation of TrkB and mTOR may be one of its mechanisms.
Collapse
Affiliation(s)
- Zhao-Hua Zhao
- Department of Anesthesiology, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China.,Institute of Basic and Translational Medicine & School of Basic Medical Sciences, Xi'an Medical University, Xi'an, 710021, China
| | - Bin Deng
- Department of Anesthesiology, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China
| | - Hao Xu
- Institute of Basic and Translational Medicine & School of Basic Medical Sciences, Xi'an Medical University, Xi'an, 710021, China
| | - Jun-Feng Zhang
- Institute of Basic and Translational Medicine & School of Basic Medical Sciences, Xi'an Medical University, Xi'an, 710021, China
| | - Ya-Jing Mi
- Institute of Basic and Translational Medicine & School of Basic Medical Sciences, Xi'an Medical University, Xi'an, 710021, China
| | - Xiang-Zhong Meng
- Department of Anesthesiology, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China
| | - Xing-Chun Gou
- Department of Anesthesiology, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China. .,Institute of Basic and Translational Medicine & School of Basic Medical Sciences, Xi'an Medical University, Xi'an, 710021, China.
| | - Li-Xian Xu
- Department of Anesthesiology, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China.
| |
Collapse
|