Abstract
Metastatic liver disease is a major cause of mortality in colorectal cancer (CRC) patients. Alcohol consumption is a noted risk factor for secondary cancers yet the role of alcoholic liver disease (ALD) in colorectal liver metastases (CRLM) is not defined. This work evaluated tumor cell colonization in the alcoholic host liver using a novel preclinical model of human CRC liver metastases. Immunocompromised Rag1-deficient mice were fed either ethanol (E) or isocaloric control (C) diets for 4 weeks prior to intrasplenic injection of LS174T human CRC cells. ALD and CRLM were evaluated 3 or 5 weeks post-LS174T cell injection with continued C/E diet administration. ALD was confirmed by increased serum transaminases, hepatic steatosis and expression of cytochrome P4502E1, a major ethanol-metabolizing enzyme. Alcohol-mediated liver dysfunction was validated by impaired endocytosis of asialoorosomucoid and carcinoembryonic antigen (CEA), indicators of hepatocellular injury and progressive CRC disease, respectively. Strikingly, the rate and burden of CRLM was distinctly enhanced in alcoholic livers with metastases observed earlier and more severely in E-fed mice. Further, alcohol-related increases (1.5–3.0 fold) were observed in the expression of hepatic cytokines (TNF-α, IL-1 beta, IL-6, IL-10) and other factors noted to be involved in the colonization of CRC cells including ICAM-1, CCL-2, CCL-7, MMP-2, and MMP-9. Also, alcoholic liver injury was associated with altered hepatic localization as well as increased circulating levels of CEA released from CRC cells. Altogether, these findings indicate that the alcoholic liver provides a permissive environment for the establishment of CRLM, possibly through CEA-related inflammatory mechanisms.
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Abbreviations
- ALD:
-
Alcoholic liver disease
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- ASGPR:
-
Asialoglycoprotein receptor
- ASOR:
-
Asialoorosomucoid
- ATCC:
-
American type culture collection
- C:
-
Control
- CCL 2, 7:
-
C–C motif chemokine ligand 2, 7
- CEA:
-
Carcinoembryonic antigen
- CRC:
-
Colorectal cancer
- CRLM:
-
Colorectal liver metastasis
- E:
-
Ethanol
- ELISA:
-
Enzyme-linked immunosorbent assay
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- H&E:
-
Hematoxylin and eosin
- ICAM-1:
-
Intracellular adhesion molecule-1
- IHC:
-
Immunohistochemical
- IL-1β, IL-6, IL-10:
-
Interleukins (1-β, 6, 10)
- KC:
-
Kupffer cell
- LD:
-
Lieber-DeCarli
- M1:
-
Macrophage marker 1
- MMP-2 and 9:
-
Metalloprotease-2 and 9
- mRNA:
-
Messenger RNA
- PBS:
-
Phosphate-buffered saline
- RT-PCR:
-
Real-time polymerase chain reaction
- ROS:
-
Reactive oxygen species
- SDS–PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- TNF-α:
-
Tumor necrosis factor alpha
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Acknowledgements
We thank the staff of the UNMC Tissue Science Facility for tissue processing services and excellent technical assistance. Support for this work was provided by the Department of Veterans Affairs and the National Institute of Health Grant AA022556 awarded to C.A.C. and P.T.
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Mohr, A.M., Gould, J.J., Kubik, J.L. et al. Enhanced colorectal cancer metastases in the alcohol-injured liver. Clin Exp Metastasis 34, 171–184 (2017). https://doi.org/10.1007/s10585-017-9838-x
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DOI: https://doi.org/10.1007/s10585-017-9838-x