Background:Human immune system (HIS)-engrafted mice are new tools to investigate human immune responses. Here, we used HIS mice to study human immune responses against human HER-2-positive cancer cells and their ability to control tumour growth and metastasis.Methods:BALB/c Rag2(-/-), Il2rg(-/-) mice were engrafted with CD34(+) or CD133(+) human cord blood hematopoietic stem cells (HSC) and vaccinated with human HER-2-positive cancer cells SK-OV-3 combined to human IL-12.Results:Both CD34(+) or CD133(+) human HSC gave long-term engraftment and differentiation, both in peripheral blood and in lymphoid organs, and production of human antibodies. Vaccinated mice produced specific anti-HER-2 human IgG. An s.c. SK-OV-3 challenge was significantly inhibited (but not abolished) in both vaccinated and non-vaccinated HIS mice. Tumours were heavily infiltrated with human and murine cells, mice showed NK cells and production of human interferon-gamma, that could contribute to tumour growth inhibition. Vaccinated HIS mice showed significantly inhibited lung metastases when compared with non-vaccinated HIS mice and to non-HIS mice, along with higher levels of tumour-infiltrating human dendritic cells.Conclusion:Anti-HER-2 responses were elicited through an adjuvanted allogeneic cancer cell vaccine in HIS mice. Human immune responses elicited in HIS mice effectively inhibited lung metastases.

Human responses against HER-2-positive cancer cells in human immune system-engrafted mice.

DE GIOVANNI, CARLA;NICOLETTI, GIORDANO;LANDUZZI, LORENA;CROCI, STEFANIA;PALLADINI, ARIANNA;Antognoli A.;IANZANO, MARIANNA LUCIA;GROSSO, VALENTINA;NANNI, PATRIZIA;LOLLINI, PIER LUIGI
2012

Abstract

Background:Human immune system (HIS)-engrafted mice are new tools to investigate human immune responses. Here, we used HIS mice to study human immune responses against human HER-2-positive cancer cells and their ability to control tumour growth and metastasis.Methods:BALB/c Rag2(-/-), Il2rg(-/-) mice were engrafted with CD34(+) or CD133(+) human cord blood hematopoietic stem cells (HSC) and vaccinated with human HER-2-positive cancer cells SK-OV-3 combined to human IL-12.Results:Both CD34(+) or CD133(+) human HSC gave long-term engraftment and differentiation, both in peripheral blood and in lymphoid organs, and production of human antibodies. Vaccinated mice produced specific anti-HER-2 human IgG. An s.c. SK-OV-3 challenge was significantly inhibited (but not abolished) in both vaccinated and non-vaccinated HIS mice. Tumours were heavily infiltrated with human and murine cells, mice showed NK cells and production of human interferon-gamma, that could contribute to tumour growth inhibition. Vaccinated HIS mice showed significantly inhibited lung metastases when compared with non-vaccinated HIS mice and to non-HIS mice, along with higher levels of tumour-infiltrating human dendritic cells.Conclusion:Anti-HER-2 responses were elicited through an adjuvanted allogeneic cancer cell vaccine in HIS mice. Human immune responses elicited in HIS mice effectively inhibited lung metastases.
De Giovanni C.; Nicoletti G.; Landuzzi L.; Romani F.; Croci S.; Palladini A.; Murgo A.; Antognoli A.; Ianzano M.L.; Stivani V.; Grosso V.; Iezzi M.; Stramucci L.; Barbieri E.; Lemoli R.M.; Nanni P.; Lollini P.L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/130650
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