Abstract
Objective
Hepatic carcinoma is one of the most common types of malignant tumors in the digestive system, and its biological characteristics determine its high rate of metastasis and recurrence after radical resection, leading to a poor prognosis for patients. Increasing evidence demonstrates that phosphoproteins and phosphorylation-mediated molecular pathways influence the occurrence and development of hepatic carcinoma. It is urgent need to develop early-stage biomarkers for improving diagnosis, therapy, medical service, and prognostic assessment. We hypothesize that phosphoproteome and phosphorylation-mediated signaling pathway networks significantly differ in human early-stage primary hepatic carcinomas relative to control liver tissues, which will identify the key differentially phosphorylated proteins and phosphorylation-mediated signaling pathway network alterations in human early-stage primary hepatic carcinoma to innovate predictive diagnosis, prognostic assessment, and personalized medical services and progress beyond the state of the art in the framework of predictive, preventive, and personalized medicine (PPPM).
Methods
Tandem mass tag (TMT)-based quantitative proteomics coupled with TiO2 enrichment of phosphopeptides was used to identify phosphorylation profiling, and bioinformatics was used to analyze the pathways and biological functions of phosphorylation profiling between early-stage hepatic carcinoma tissues and tumor-adjacent normal control tissues. Furthermore, the integrative analysis with transcriptomic data from TCGA database obtained differently expressed genes (DEGs) corresponding to differentially phosphorylated proteins (DPPs) and overall survival (OS)-related DPPs.
Results
A total of 1326 phosphopeptides derived from 858 DPPs in human early-stage primary hepatic carcinoma were identified. KEGG pathway network analysis of 858 DPPs revealed 33 statistically significant signaling pathways, including spliceosome, glycolysis/gluconeogenesis, B-cell receptor signaling pathway, HIF-1 signaling pathway, and fatty acid degradation. Gene Ontology (GO) analysis of 858 DPPs revealed that protein phosphorylation was involved in 57 biological processes, 40 cellular components, and 37 molecular functions. Protein–protein interaction (PPI) network constructed multiple high-combined scores and co-expressed DPPs. Integrative analysis of transcriptomic data and DPP data identified 105 overlapped molecules (DPPs; DEGs) between hepatic carcinoma tissues and control tissues and 125 OS-related DPPs. Overlap** Venn plots showed 14 common molecules among datasets of DPPs, DEGs, and OS-related DDPs, including FTCD, NDRG2, CCT2, PECR, SLC23A2, PNPLA7, ANLN, HNRNPM, HJURP, MCM2, STMN1, TCOF1, TOP2A, and SSRP1. The drug sensitivities of OS-related DPPs were identified, including LMOD1, CAV2, UBE2E2, RAPH1, ANXA5, HDLBP, CUEDC1, APBB1IP, VCL, SRSF10, SLC23A2, EPB41L2, ESR1, PLEKHA4, SAFB2, SMARCAD1, VCAN, PSD4, RDH16, NOP56, MEF2C, BAIAP2L2, NAGS, SRSF2, FHOD3, and STMN1.
Conclusions
Identification and annotation of phosphoproteomes and phosphorylation-mediated signaling pathways in human early-stage primary hepatic carcinoma tissues provided new directions for tumor prevention and treatment, which (i) helps to enrich phosphorylation functional research and develop new biomarkers; (ii) enriches phosphorylation-mediated signaling pathways to gain a deeper understanding of the underlying mechanisms of early-stage primary hepatic carcinoma; and (iii) develops anti-tumor drugs that facilitate targeted phosphorylated sites. We recommend quantitative phosphoproteomics in early-stage primary hepatic carcinoma, which offers great promise for in-depth insight into the molecular mechanism of early-stage primary hepatic carcinoma, the discovery of effective therapeutic targets/drugs, and the construction of reliable phosphorylation-related biomarkers for patient stratification, predictive diagnosis, prognostic assessment, and personalized medical services in the framework of PPPM.
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Data availability
All data and materials are provided in this article, and supplemental materials can be made publicly available.
Code availability
All protein and gene accession codes are available in the Swiss-Prot and Genbank databases.
Abbreviations
- AFP:
-
Alpha-fetoprotein
- ATO:
-
Arsenic trioxide
- BP:
-
Biological processes
- CC:
-
Cellular components
- CTLA-4:
-
Cytotoxic T immune checkpoint suppressor lymphocyte-associated protein 4
- DEG:
-
Differentially expressed genes
- FAS:
-
Fatty acid synthase
- GO:
-
Gene Ontology
- HCD:
-
Higher-energy collisional dissociation
- HIF-1:
-
Hypoxia-inducible factor 1
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- LC:
-
Liquid chromatography
- MA:
-
Megestrol acetate
- MF:
-
Molecular functions
- MS/MS:
-
Tandem mass spectrometry
- OS:
-
Overall survival
- PD-1:
-
Programmed cell death protein 1
- PPI:
-
Protein–protein interaction
- PTM:
-
Post-translational modifications
- ROS:
-
Reactive oxygen species
- RS:
-
Arginine/serine
- S:
-
Serine
- SCX:
-
Strong cation exchange
- STK4:
-
Serine and threonine kinases
- T:
-
Threonine
- TCGA:
-
The Cancer Genome Atlas
- TMT:
-
Tandem mass tag
- Y:
-
Tyrosine
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Acknowledgements
The authors acknowledge The Cancer Genome Atlas (TCGA) project organizers as well as all study participants for providing the publicly available TCGA RNA-seq data and clinical data.
Funding
This work was supported by the Shandong Provincial Taishan Scholar Engineering Project Special Funds (to X.Z.), SCIBP Supported Projects (NO.SCIBP2021070018), the Shandong Provincial Natural Science Foundation (ZR2021MH156; ZR2022QH112), the Shandong First Medical University Talent Introduction Funds (to X.Z.), the Shandong First Medical University High-level Scientific Research Achievement Cultivation Funding Program (to X.Z.), and China National Nature Scientific Funds (82203592).
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Authors and Affiliations
Contributions
Y.Z. and N.L. analyzed data, prepared figures and tables, and designed and wrote the manuscript. Y.Z. and W.J. collected and processed clinical tissue samples, sample diagnoses, and clinical explanations. L.Y., Q.S., and Z. L. participated in partial data analysis. X.Z. conceived the concept, obtained phosphoproteomics original data, supervised results, designed, wrote, and critically revised the manuscript, and was responsible for its financial support and the corresponding works. All authors approved the final manuscript.