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04.05.2018 | Original Article – Clinical Oncology | Ausgabe 8/2018

Journal of Cancer Research and Clinical Oncology 8/2018

Identification of aberrantly expressed F-box proteins in squamous-cell lung carcinoma

Zeitschrift:
Journal of Cancer Research and Clinical Oncology > Ausgabe 8/2018
Autoren:
Kai Wang, Xiao Qu, Shaorui Liu, Xudong Yang, Fenglong Bie, Yu Wang, Cuicui Huang, Jiajun Du
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00432-018-2653-1) contains supplementary material, which is available to authorized users.

Abstract

Purpose

F-box proteins, as components of the Skp1-Cullin 1-F-box protein (SCF) E3 ubiquitin ligase, can specifically bind to substrates and regulate multiple tumor behaviors. However, the role of F-box proteins in squamous-cell lung carcinoma (SqCLC) has not been established.

Methods

We identified the differentially expressed F-box protein-encoding genes in SqCLC by analyzing data from The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) databases. Prognosis data were evaluated using the Kaplan–Meier (KM) plotter website. The FBXO5 and FBXO45 mRNA levels were analyzed by real time RT-PCR. The impact of the inhibition of these genes with si-RNA on apoptosis and migration was also investigated.

Results

The FBXO45 and FBXO5 genes were significantly up-regulated in SqCLC compared with normal lung (p values = 0.002 and 0.025, respectively). FBXO45 was significantly elevated in each tumorigenic step, including dysplasia, in situ and SqCLC. The RT-PCR analysis results showed that FBXO5 and FBXO45 were elevated in cancer tissues (p values = 0.024 and 0.004, respectively). Overexpression of FBXO5 and FBXO45 was associated with shorter overall survival (OS) in the SqCLC patients from the K–M plotter database [FBXO5 HR: 1.53 (1.03–2.28), p = 0.036]; [FBXO45 HR: 1.47 (1.03–2.08), p = 0.030]. The GO and KEGG pathway analysis showed that FBXO5 and FBXO45 were associated with cell cycle and adhesion, respectively. Knockdown of FBXO5 leads to increased apoptosis, while knockdown of FBXO45 facilitates the process of epithelial–mesenchymal transition (EMT).

Conclusions

Our results provide evidence that FBXO45 and FBXO5 may play a key role in tumorigenesis and prognosis of SqCLC.

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Zusatzmaterial
Mutation alterations of F-box proteins in all TCGA LUSC samples from cBioportal (S1A). Detailed mutations of FBXW7 were shown in S1B. Kaplan Meier curve from K–M plotter showed that over-expression of FBXW7 indicated a favorable prognosis (S1C) (TIF 2332 KB)
432_2018_2653_MOESM1_ESM.tif
The impact of differentially expressed F-box proteins on overall survival in I-IIIA resected SqCLC patients from TCGA database (FBXL6: A; FBXL19: B; FBXO5: C; FBXO17: D; FBXO27: E; FBXO32: F; FBXO41: G; FBXO43: H; FBXO45: I) (TIF 596 KB)
432_2018_2653_MOESM2_ESM.tif
Protein-protein interaction (PPI) network of FBXO45 (S3A) and FBXO5 (S3B) in TCGA SqCLC database. GSEA analysis showed pathways enriched in high FBXO5 group (S3C), low FBXO45 group (S3D) and high FBXO45 group (S3E) (TIF 1194 KB)
432_2018_2653_MOESM3_ESM.tif
The expression of FBXO5 and FBXO45 was elevated in squamous lung cancer cell lines than lung adenocarcinoma cell lines (GSE57083, S4A). Protein expression of FBXO5 and FBXO45 in cell lines was shown in S4B. Immunohistochemical (IHC) images showed FBXO5 staining of pneumonocytes in normal lung tissues (Upper line) and FBXO5 staining in squamous lung cancer tissues (Bottom line, from left to right: not detected, weak staining, moderate/strong staining, S4E). Immunohistochemical (IHC) images showed FBXO45 staining of pneumonocytes in normal lung tissues (Upper line) and FBXO45 staining in squamous lung cancer tissues (Bottom line, from left to right: not detected, weak staining, moderate/strong staining, S4F). The quantitive scores were shown in S4C. Wound healing assay results showed the increased migration of FBXO5 knockdown group (bottom line) compared to negative group (upper line) at 0, 24, 48 hours (from left to right, S4D) (TIF 14462 KB)
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Supplementary material 5 (DOCX 14 KB)
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Supplementary material 6 (DOCX 14 KB)
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Supplementary material 7 (DOCX 14 KB)
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Supplementary material 8 (DOCX 14 KB)
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Supplementary material 9 (DOCX 23 KB)
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Literatur
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