BACKGROUND AND PURPOSE: In osteosarcoma (OS) patients, only a limited number of drugs are active and the regimens currently in use include a combination of at least two of these drugs: doxorubicin, cisplatin, methotrexate and ifosfamide. Today, 30-40% of patients still die of OS highlighting the urgent need for new treatments. Invariant NKT (iNKT) cells are a lymphocyte lineage with features of both T and NK cells, playing important roles in tumour suppression. Our aim was to test whether the cytoxicity induced by cisplatin, doxorubicin and methotrexate against OS cells can be enhanced by iNKT cell treatment. EXPERIMENTAL APPROACH: iNKT cells were purified from human peripheral blood mononuclear cells by cell sorting (Vα24Vβ11(+) cells) and used as effector cells against OS cells (U2-OS, HOS, MG-63). Cell death (calcein-AM method), perforin/granzyme B and Fas/FasL expressions were determined by flow cytometry. CD1d expression was analysed at both the gene and protein level. KEY RESULTS: iNKT cells were cytotoxic against OS cells through a CD1d-dependent mechanism. This activity was specific for tumour cells, because human CD1d(+) mesenchymal stem cells and CD1d(-) osteoblasts were not affected. iNKT cell treatment enhanced drug-induced OS cell death in a concentration-dependent manner and this effect was reduced in CD1d-silenced OS cells. CONCLUSION AND IMPLICATIONS: iNKT cells kill malignant, but not non-malignant, cells. iNKT cell treatment enhances the cytotoxicity of anti-neoplastic drugs against OS cells in a CD1d-dependent manner. The present data encourage further studies on the use of iNKT cells in OS therapy.
BACKGROUND AND PURPOSE: In osteosarcoma (OS) patients, only a limited number of drugs are active and the regimens currently in use include a combination of at least two of these drugs: doxorubicin, cisplatin, methotrexate and ifosfamide. Today, 30-40% of patients still die of OS highlighting the urgent need for new treatments. Invariant NKT (iNKT) cells are a lymphocyte lineage with features of both T and NK cells, playing important roles in tumour suppression. Our aim was to test whether the cytoxicity induced by cisplatin, doxorubicin and methotrexate against OS cells can be enhanced by iNKT cell treatment. EXPERIMENTAL APPROACH: iNKT cells were purified from human peripheral blood mononuclear cells by cell sorting (Vα24Vβ11(+) cells) and used as effector cells against OS cells (U2-OS, HOS, MG-63). Cell death (calcein-AM method), perforin/granzyme B and Fas/FasL expressions were determined by flow cytometry. CD1d expression was analysed at both the gene and protein level. KEY RESULTS: iNKT cells were cytotoxic against OS cells through a CD1d-dependent mechanism. This activity was specific for tumour cells, because humanCD1d(+) mesenchymal stem cells and CD1d(-) osteoblasts were not affected. iNKT cell treatment enhanced drug-induced OS cell death in a concentration-dependent manner and this effect was reduced in CD1d-silenced OS cells. CONCLUSION AND IMPLICATIONS: iNKT cells kill malignant, but not non-malignant, cells. iNKT cell treatment enhances the cytotoxicity of anti-neoplastic drugs against OS cells in a CD1d-dependent manner. The present data encourage further studies on the use of iNKT cells in OS therapy.
Authors: Masaki Terabe; Chand Khanna; Seuli Bose; Fraia Melchionda; Arnulfo Mendoza; Crystal L Mackall; Lee J Helman; Jay A Berzofsky Journal: Cancer Res Date: 2006-04-01 Impact factor: 12.701
Authors: Carlos J Montoya; David Pollard; Jeffrey Martinson; Kumud Kumari; Clive Wasserfall; Candice B Mulder; Maria T Rugeles; Mark A Atkinson; Alan L Landay; S Brian Wilson Journal: Immunology Date: 2007-07-28 Impact factor: 7.397
Authors: Nadine Y Crowe; Jonathan M Coquet; Stuart P Berzins; Konstantinos Kyparissoudis; Rachael Keating; Daniel G Pellicci; Yoshihiro Hayakawa; Dale I Godfrey; Mark J Smyth Journal: J Exp Med Date: 2005-11-07 Impact factor: 14.307
Authors: Laura Escribà-Garcia; Carmen Alvarez-Fernández; Ana Carolina Caballero; Robert Schaub; Jorge Sierra; Javier Briones Journal: Oncoimmunology Date: 2018-11-26 Impact factor: 8.110