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Transl Res. 2016 Apr;170:89-98.e3. doi: 10.1016/j.trsl.2015.12.007. Epub 2015 Dec 18.

Novel immunologic tolerance of human cancer cell xenotransplants in zebrafish.

Author information

1
Department of Molecular and Cellular Pharmacology, Mie University Graduate School of Medicine, Mie, Japan; Department of Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Mie, Japan.
2
Department of Molecular and Cellular Pharmacology, Mie University Graduate School of Medicine, Mie, Japan; Department of Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Mie, Japan; Department of Systems Pharmacology, Mie University Graduate School of Medicine, Mie, Japan; Mie University Medical Zebrafish Research Center, Mie, Japan; Department of Bioinformatics, Mie University Life Science Research Center, Mie, Japan; Department of Omics Medicine, Mie University Industrial Technology Innovation Institute, Mie, Japan.
3
Department of Molecular and Cellular Pharmacology, Mie University Graduate School of Medicine, Mie, Japan; Department of Pharmacogenomics and Pharmacoinformatics, Mie University Graduate School of Medicine, Mie, Japan; Department of Systems Pharmacology, Mie University Graduate School of Medicine, Mie, Japan; Mie University Medical Zebrafish Research Center, Mie, Japan; Department of Bioinformatics, Mie University Life Science Research Center, Mie, Japan; Department of Omics Medicine, Mie University Industrial Technology Innovation Institute, Mie, Japan. Electronic address: tanaka@doc.medic.mie-u.ac.jp.

Abstract

Immune deficiency or suppression in host animals is an essential precondition for the success of cancer cell xenotransplantation because the host immune system has a tendency to reject implanted cells. However, in such animals, the typical tumor microenvironment seen in cancer subjects does not form because of the lack of normal immunity. Here, we developed a novel zebrafish (Danio rerio) model based on 2 rounds of cancer cell xenotransplantation that achieved cancer-specific immunologic tolerance without immunosuppression. We irradiated human cancer cells (PC-3, K562 and HepG2) to abolish their proliferative abilities and implanted them into zebrafish larvae. These cells survived for 2 weeks in the developing host. Three months after the first implantation, the zebrafish were implanted with the same, but nonirradiated, cell lines. These cancer cells proliferated and exhibited metastasis without immune suppression. To reveal the transcriptional mechanism of this immune tolerance, we conducted dual RNA-seq of the tumor with its surrounding tissues and identified several regulatory zebrafish genes that are involved in immunity; the expression of plasminogen activator, urokinase, and forkhead box P3 was altered in response to immunologic tolerance. In conclusion, this xenograft method has potential as a platform for zebrafish-based anticancer drug discovery because it can closely mimic human clinical cancers without inducing immune suppression.

PMID:
26746804
DOI:
10.1016/j.trsl.2015.12.007
[Indexed for MEDLINE]

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