Abstract
Objective
The patients with sigmoid colorectal cancer commonly show high mortality and poor prognosis. Increasing evidence has demonstrated that the ubiquitinated proteins and ubiquitination-mediated molecular pathways influence the growth and aggressiveness of colorectal cancer. It emphasizes the scientific merits of quantitative ubiquitinomics in human sigmoid colon cancer. We hypothesize that the ubiquitinome and ubiquitination-mediated pathway networks significantly differ in sigmoid colon cancers compared to controls, which offers the promise for in-depth insight into molecular mechanisms, discovery of effective therapeutic targets, and construction of reliable biomarkers in the framework of predictive, preventive, and personalized medicine (PPPM; 3P medicine).
Methods
The first ubiquitinome analysis was performed with anti-K-ε-GG antibody beads (PTMScan ubiquitin remnant motif [K-ε-GG])-based label-free quantitative proteomics and bioinformatics to identify and quantify ubiquitination profiling between sigmoid colon cancer tissues and para-carcinoma tissues. A total of 100 human sigmoid colon cancer samples that included complete clinical information and the corresponding gene expression data were obtained from The Cancer Genome Atlas (TCGA). Ubiquitination was the main way of protein degradation; the relationships between differentially ubiquitinated proteins (DUPs) and their differently expressed genes (DEGs) and between DUPs and their differentially expressed proteins (DEPs) were analyzed between cancer tissues and control tissues. The overall survival of those DUPs was obtained with Kaplan-Meier method.
Results
A total of 1249 ubiquitinated sites within 608 DUPs were identified in human sigmoid colon cancer tissues. KEGG pathway network analysis of these DUPs revealed 35 statistically significant signaling pathways, such as salmonella infection, glycolysis/gluconeogenesis, and ferroptosis. Gene Ontology (GO) analysis of 608 DUPs revealed that protein ubiquitination was involved in 98 biological processes, 64 cellular components, 51 molecule functions, and 26 immune system processes. Protein-protein interaction (PPI) network of 608 DUPs revealed multiple high-combined scores and co-expressed DUPs. The relationship analysis between DUPs and their DEGs found 4 types of relationship models, including DUP-up (increased ubiquitination level) and DEG-up (increased gene expression), DUP-up and DEG-down (decreased gene expression), DUP-down (decreased ubiquitination level) and DEG-up, and DUP-down and DEG-down. The relationship analysis between DUPs and their DEPs found 4 types of relationship models, including DUP-up and DEP-up (increased protein expression), DUP-up and DEP-down (decreased protein expression), DUP-down and DEP-up, and DUP-down and DEP-down. Survival analysis found 46 overall survival-related DUPs in sigmoid colon cancer, and the drug sensitivity of overall survival-related DUPs were identified.
Conclusion
The study provided the first differentially ubiquitinated proteomic profiling, ubiquitination-involved signaling pathway network changes, and the relationship models between protein ubiquitination and its gene expression and between protein ubiquitination and its protein expression, in human sigmoid colon cancer. It offers the promise for deep insights into molecular mechanisms of sigmoid colon cancer, and discovery of effective therapeutic targets and biomarkers for patient stratification, predictive diagnosis, prognostic assessment, and personalized treatment in the context of 3P medicine.









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All protein and gene accession codes can be available in the Swiss-Prot and GenBank databases.
Abbreviations
- AvrA :
-
virulence factor
- ABIN-1 :
-
ubiquitin-binding protein
- ATP :
-
adenosine triphosphate
- BP :
-
biological process
- DEG :
-
differently expressed genes
- DUB :
-
deubiquitinases
- DUP :
-
differentially ubiquitinated proteins
- GO :
-
Gene Ontology
- ISP :
-
immune system process
- KEGG :
-
Kyoto Encyclopedia of Genes and Genomes
- K-ε-GG :
-
ubiquitinated lysine
- LC :
-
liquid chromatography
- MLKL :
-
mixed lineage kinase domain-like
- MS/MS :
-
tandem mass spectrometry
- OS :
-
overall survival
- PHGDH :
-
phosphoglycerate dehydrogenase
- PPI :
-
protein-protein interaction
- PPPM :
-
predictive, preventive, and personalized medicine
- PTM :
-
post-translational modifications
- RIPK3 :
-
receptor-interacting serine-threonine kinase 3
- ROS :
-
reactive oxygen species
- TCGA :
-
The Cancer Genome Atlas
- TH1 :
-
CD4+T helper 1 cells
- TH-17 :
-
T helper interleukin 17 producing
- Treg :
-
T regulatory cells
- UBD :
-
ubiquitin protein-binding domains
- UPS :
-
ubiquitin proteasome system
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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. SCIBP2021080005), the Shandong Provincial Natural Science Foundation (ZR2021MH156, ZR2022QH112, ZR2020LZL012), 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.), Shandong First Medical University Undergraduate Innovation Research Program (Project No. 2022104391511), China National Nature Scientific Funds (82203592), CSCO-CSPC Cancer Research Fund Project, and the Beijing Science and Technology Innovation Medical Development Foundation (No. KC2021-JX-0186-138).
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H. Y., N. L., and L. C. analyzed the data, prepared the figures and tables, and designed and wrote the manuscript. W. J., and L. Z. collected the clinical tissue samples, sample diagnosis, and clinical explanation. Y. Z., J. L., R. C., J. S., L. Y., and X. G. participated in the partial data analysis and experiments. X. Z. conceived the concept; obtained the ubiquitinomics original data; supervised the results; designed, wrote, and critically revised manuscript; and was responsible for its financial supports and the corresponding works. All authors approved the final manuscript.
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Supplementary information
Supplementary figure 1.
The significant signaling pathways of differentially ubiquitinated proteins in sigmoid cancer (PPTX 2470 kb)
Supplementary figure 2.
The overall survival analysis of differentially ubiquitinated proteins in sigmoid cancer (DOCX 1395 kb)
Supplementary Table 1:
Differentially ubiquitinated proteins in sigmoid cancer identified with quantitative ubiquitinomics. K* = ubiquitinated lysine residue (+114.04). M# = oxidated Met residue (+15.99). C# = Carbamidomethylated Cystine residue (+57.02). (+42.01) means protein N-terminal acetylation. Ratio (T/N) = Ratio (tumor/nornal control). Red = increased ubiquitination level. Green = Descreased ubiquitination level. (XLSX 196 kb)
Supplementary Table 2:
The significant pathways of differentially ubiquitinated proteins in sigmoid colon cancer. (XLSX 19 kb)
Supplementary Table 3:
The Biological Process analysis of differentially ubiquitinated proteins in sigmoid cancer. (XLS 189 kb)
Supplementary Table 4:
TheCellularComponent analysis of differentially ubiquitinated proteins in sigmoid cancer. (XLS 137 kb)
Supplementary Table 5:
The MolecularFunction analysis of differentially ubiquitinated proteins in sigmoid cancer. (XLS 106 kb)
Supplementary Table 6:
The Immune System Process analysis of differentially ubiquitinated proteins in sigmoid cancer. (XLS 70 kb)
Supplementary Table 7:
The protein and protein interaction network of the differentially ubiquitinated proteins in sigmoid cancer. (XLSX 29 kb)
Supplementary Table 8:
Clinical characteristic and corresponding gene expression of sigmoid colon cancer based on TCGA database. (XLSX 504 kb)
Supplementary Table 9:
Differentially expressed genes between cancer and normal tissues based on TCGA database according to the differentially ubiquitinated proteins in sigmoid cancer. (XLSX 17 kb)
Supplementary Table 10.
Differentially expressed proteins (DEPs) identified in colorectal cancers compared to controls*. (XLSX 24 kb)
Supplementary Table 11:
The overall survival of the differentially ubiquitinated proteins in sigmoid cancer. (XLSX 34 kb)
Supplementary Table 12:
The drug sensitivity of the identified differentially ubiquitinated proteins in sigmoid cancer. (XLSX 15 kb)
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Yang, H., Li, N., Chen, L. et al. Ubiquitinomics revealed disease- and stage-specific patterns relevant for the 3PM approach in human sigmoid colon cancers. EPMA Journal 14, 503–525 (2023). https://doi.org/10.1007/s13167-023-00328-2
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DOI: https://doi.org/10.1007/s13167-023-00328-2