Abstract
Extracellular vesicles (EVs) are cell-released, membranous structures essential for intercellular communication. The biochemical compositions and physiological impacts of exosomes, lipid-bound, endosomal origin EVs, have been focused on, especially on the tumor-host interactions in a defined tumor microenvironment (TME). Despite recent progress in targeted therapy and cancer immunotherapy in colorectal cancer (CRC), cancer patients still suffer from distal metastasis and tumor relapse, suggesting unmet needs for biomarkers directing therapeutic interventions and predicting treatment responsiveness. As exosomes are indispensable for intercellular communication and high exosome abundance makes them feasible biomarker molecules, this review discusses exosome heterogeneity and how exosomes orchestrate the interplay among tumor cells, cancer stem cells (CSCs) and host cells, including stromal cells, endothelial cells and immunocytes, in the CRC TME. This review also discusses mechanisms for loading exosomal contents and potential exosomal DNA, RNA and protein biomarkers for early CRC detection. Finally, we summarize the diagnostic and therapeutic exosomes in clinical trials. We envision that detecting and targeting cancer-specific exosomes could provide therapeutic advances in developing personalized cancer medicine.
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Abbreviations
- CAFs:
-
Cancer-associated fibroblasts
- CEA:
-
Carcinoembryonic antigen
- ceRNA:
-
Endogenous RNA
- circRNAs:
-
Circular RNAs
- CRC:
-
Colorectal cancer
- CRCSCs:
-
Colorectal cancer stem cells
- CSCs:
-
Cancer stem cells
- CTC:
-
Circulating tumor cells
- DCs:
-
Dendritic cells
- ECM:
-
Extracellular matrix
- EMT:
-
Epithelial-mesenchymal transition
- ESCRT:
-
Endosomal sorting complexes required for transport
- EVs:
-
Extracellular vesicles
- FOBT:
-
Fecal occult blood test
- HDI:
-
High developing index
- HLECs:
-
Human lymphatic endothelial cells
- HMEC-1:
-
Human microvascular endothelial cells
- HUVECs:
-
Human umbilical vein endothelial cells
- ILVs:
-
Intraluminal vesicles
- LPS:
-
Lipopolysaccharide
- MDSCs:
-
Myeloid-derived suppressor cells
- MIIC:
-
Major histocompatibility complex class II-enriched component
- MISEVs:
-
Minimal information for studies of extracellular vesicles
- MN:
-
Micronuclei
- mtDNA:
-
Mitochondria DNA
- MVBs:
-
Multivesicular bodies
- nSMase:
-
Neutral sphingomyelinase
- SCD:
-
Symmetric cell division
- SEER:
-
Surveillance, Epidemiology, and End Results
- SLNs:
-
Sentinel lymph nodes
- TGF-β1:
-
Transforming growth factor-β1
- TME:
-
Tumor microenvironment
- TRAF3:
-
TNF receptor-associated Factor 3
- Tregs:
-
Regulatory T cells
- VEGF:
-
Vascular endothelial growth factor
- WHO:
-
World Health Organization
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Acknowledgements
This work was supported by the Cancer Progression Research Center, National Yang Ming Chiao Tung University from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and YEN TJING LAING MEDICAL FOUNDATION in Taiwan.
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Ministry of Science and Technology (109–2320-B-010–021 and 111–2628-B-A49-017 to W-L.H., 109–2314-B-075–081-MY3 to H-W. T., 109–2314-B-075–026 to C–C.L.); a grant from the Yen Tjing Ling Medical Foundation (CI-111–15 to W-L.H.), a grant from the Ministry of Health and Welfare, Center of Excellence for Cancer Research (MOHW107-TDU-B-211–114019, 111 W31208 to W-L.H.) and a grant from the Higher Education Sprout Project by the Ministry of Education (MOE) (110AC-D303 to W-L.H.). Taipei Veterans General Hospital (V111C-069 and V110C-189 to H-W.T.). The Innovative Research Grant of the National Health Research Institutes of Taiwan (NHRI-EX110-11010BI to W–H.Y.) and Ying Tsai Young Scholar Award (CMU108-YTY-04 to W–H.Y.).
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W–C.L., C–C.L. Y-Y.L., H-W.T. and W-L.H. wrote and revised the manuscript with assistance from W–H.Y. and Y-C.T.
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Lin, WC., Lin, CC., Lin, YY. et al. Molecular actions of exosomes and their theragnostics in colorectal cancer: current findings and limitations. Cell Oncol. 45, 1043–1052 (2022). https://doi.org/10.1007/s13402-022-00711-7
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DOI: https://doi.org/10.1007/s13402-022-00711-7