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Fei Y, Xu J, Ge L, Chen L, Yu H, Pan L, Chen P. Establishment and validation of individualized clinical prognostic markers for LUAD patients based on autophagy-related genes. Aging (Albany NY) 2022; 14:7328-7347. [PMID: 36178365 PMCID: PMC9550247 DOI: 10.18632/aging.204097] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 05/13/2022] [Indexed: 12/24/2022]
Abstract
There is considerable heterogeneity in the genomic drivers of lung adenocarcinoma, which has a dismal prognosis. Bioinformatics analysis was performed on lung adenocarcinoma (LUAD) datasets to establish a multi-autophagy gene model to predict patient prognosis. LUAD data were downloaded from The Cancer Genome Atlas (TCGA) database as a training set to construct a LUAD prognostic model. According to the risk score, a Kaplan-Meier cumulative curve was plotted to evaluate the prognostic value. Furthermore, a nomogram was established to predict the three-year and five-year survival of patients with LUAD based on their prognostic characteristics. Two genes (ITGB1 and EIF2AK3) were identified in the autophagy-related prognostic model, and the multivariate Cox proportional risk model showed that risk score was an independent predictor of prognosis in LUAD patients (HR=3.3, 95%CI= 2.3 to 4.6, P< 0.0001). The Kaplan-Meier cumulative curve showed that low-risk patients had significantly better overall (P<0.0001). The validation dataset GSE68465 further confirmed the nomogram’s robust ability to assess the prognosis of LUAD patients. A prognosis model of autophagy-related genes based on a LUAD dataset was constructed and exhibited diagnostic value in the prognosis of LUAD patients. Moreover, real-time qPCR confirmed the expression patterns of EIF2AK3 and ITGB1 in LUAD cell lines. Two key autophagy-related genes have been suggested as prognostic markers for lung adenocarcinoma.
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Affiliation(s)
- Yuchang Fei
- Department of Integrated Chinese and Western Medicine, The First People’s Hospital of Jiashan, Jiaxing, Zhejiang, China
| | - Junyi Xu
- Information Center, The First People’s Hospital of Jiashan, Jiaxing, Zhejiang, China
| | - Liping Ge
- Department of Breast Surgery, Fudan University Shanghai Cancer Center, Xuhui, Shanghai, China
| | - Luting Chen
- Department of Integrated Chinese and Western Medicine, The First People’s Hospital of Wenling, Taizhou, Zhejiang, China
| | - Huan Yu
- Ningbo Yinzhou Second Hospital, Ningbo, Zhejiang, China
| | - Lei Pan
- Department of Oncology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Peifeng Chen
- Department of Oncology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
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Li D, He C, Ye F, Ye E, He H, Chen G, Zhang J. p62 Overexpression Promotes Bone Metastasis of Lung Adenocarcinoma out of LC3-Dependent Autophagy. Front Oncol 2021; 11:609548. [PMID: 34094898 PMCID: PMC8175982 DOI: 10.3389/fonc.2021.609548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 04/06/2021] [Indexed: 11/20/2022] Open
Abstract
p62 protein has been implicated in bone metastasis and is a multifunctional adaptor protein usually correlated with autophagy. Herein, we investigated p62 expression and its prognostic significance in bone metastasis of lung adenocarcinoma, and analyzed whether the mechanism involved depends on autophagy. mRNA and protein expression of p62, LC3B and Beclin 1 were detected by reverse transcription-quantitative PCR and western blotting, respectively, in fresh bone metastasis tissues (n=6 cases) and normal cancellous bone tissues (n=3 cases). The association between p62 and LC3B expression and patient prognosis was subsequently analyzed in 62 paraffin-embedded bone metastasis specimens by immunohistochemistry assay. Small interfering RNA (siRNA) was employed to downregulate p62 expression in SPC-A-1 and A549 cells. Cell proliferation and migration ability were tested by CCK8, CCF and Transwell assays respectively. Autophagy was induced by Rapamycin or inhibited by Atg 7 knockout/Chloroquine in A549 cells and p62 and LC3II/I expression were analyzed. After subcutaneous inoculation or intracardial injection of A549 cells into nude mice, the effect of p62 downregulation in vivo was analyzed by histopathological examination. The results showed that p62, LC3B and Beclin 1 mRNA and protein were all overexpressed in bone metastasis tissues (all P<0.01). Patient samples with high p62 expression levels were significantly associated with more bone lesions (>3), shorter overall survival rates and shorter progression free survival rates compared with patients having lower p62 expression (P=0.014, P=0.003, P=0.048, respectively). Cox regression analysis identified p62 expression as an independent prognostic indicator of overall survival of patients with bone metastasis (P=0.007). In vitro p62 downregulation inhibited SPC-A-1 and A549 cells migration but had no effect on cell proliferation. After autophagy induction or inhibition, p62 expression involved in autophagy flux and changed inconsistently according to the switch of LC3I to LC3II in different autophagy conditions. In vivo p62 downregulation had no effect on growth of subcutaneous tumor. Lung or bone metastasis lesion was not found in all mice model. These findings suggested that p62 overexpression promotes tumor cell invasion out of LC3-dependent autophagy, which could be used a potential prognostic biomarker and therapeutic target for bone metastasis of lung adenocarcinoma.
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Affiliation(s)
- Dongqi Li
- Department of Orthopaedics, Bone and Soft Tissue Tumors Research Center of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
| | - Chuanchun He
- Department of Orthopaedics, Bone and Soft Tissue Tumors Research Center of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
| | - Fan Ye
- Department of Orthopaedics, Bone and Soft Tissue Tumors Research Center of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
| | - En Ye
- Department of Pathology, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
| | - Hao He
- Department of Orthopaedics, Bone and Soft Tissue Tumors Research Center of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
| | - Gong Chen
- Department of Orthopaedics, Bone and Soft Tissue Tumors Research Center of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
| | - Jing Zhang
- Department of Orthopaedics, Bone and Soft Tissue Tumors Research Center of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Tumor Hospital of Yunnan Province, Kunming, China
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