B7H6 is a functional ligand for NKp30 in rat and cattle and determines NKp30 reactivity toward human cancer cell lines
| Autor: | Erik Dissen, Camilla Henden, Preben Boysen, Lavanya Thiruchelvam-Kyle, Sigurd E. Hoelsbrekken, Elisabeth Gyllensten Bjørnsen, Per C. Saether, Michael R. Daws |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
B7 Antigens Pseudogene Immunology Biology Ligands Lymphocyte Activation 03 medical and health sciences Mice 0302 clinical medicine Cell surface receptor In vivo Antigens Neoplasm Cell Line Tumor medicine Immunology and Allergy Animals Humans Cloning Molecular Phylogeny Natural Cytotoxicity Triggering Receptor 3 Ligand Cancer Transfection medicine.disease Biological Evolution Cell biology Rats Killer Cells Natural 030104 developmental biology Cell culture Cancer cell Cattle Pseudogenes 030215 immunology |
| ISSN: | 0014-2980 |
| Popis: | NK cells kill cancer cells and infected cells upon activation by cell surface receptors. Human NKp30 is an activating receptor expressed by all mature NK cells. The B7 family member B7H6 has been identified as one ligand for NKp30. Several alternative ligands have also been reported, and the field remains unsettled. To this end, we have identified full-length functional B7H6 orthologs in rat and cattle, demonstrated by phylogenetic analysis and transfection experiments. In cell-cell contact-dependent assays, chimeric NKp30 reporter cells responded strongly to B7H6 in rat and cattle. Likewise, rat NKp30 expressing target cells induced strong activation of B7H6 reporter cells. Together, these observations demonstrate that B7H6 is conserved as a functional ligand for NKp30 in mammalian species separated by more than 100 million years of evolution. B7H6 and NKp30 are pseudogenes in laboratory mice. The rat thus represents an attractive experimental animal model to study the NKp30-B7H6 interaction in vivo. B7H6 was widely expressed among human cancer cell lines, and the expression level correlated strongly with the activation of human NKp30 reporter cells. Furthermore, siRNA knockdown of B7H6 abolished NKp30 reporter responses, suggesting that B7H6 is the major functionally relevant expressed ligand for NKp30 on these cancer cell lines. |
| Databáze: | OpenAIRE |
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