alexa Adoptive T cell immunotherapy of human uveal melanoma targeting gp100.
Molecular Biology

Molecular Biology

Journal of Cytology & Histology

Author(s): Sutmuller RP, Schurmans LR, van Duivenvoorde LM, Tine JA, van Der Voort EI,

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Abstract HLA-A*0201-restricted CTL against human gp100 were isolated from HLA-A*0201/K(b) (A2/K(b))-transgenic mice immunized with recombinant canarypox virus (ALVAC-gp100). These CTL strongly responded to the gp100(154-162) epitope, in the context of both the chimeric A2/K(b) and the wild-type HLA-A*0201- molecule, and efficiently lysed human HLA-A*0201(+), gp100(+) melanoma cells in vitro. The capacity of the CTL to eradicate these tumors in vivo was analyzed in A2/K(b)-transgenic transgenic mice that had received a tumorigenic dose of human uveal melanoma cells in the anterior chamber of the eye. This immune-privileged site offered the unique opportunity to graft xenogeneic tumors into immunocompetent A2/K(b)-transgenic mice, a host in which they otherwise would not grow. Importantly, systemic (i.v.) administration of the A2/K(b)-transgenic gp100(154-162)-specific CTL resulted in rapid elimination of the intraocular uveal melanomas, indicating that anti-tumor CTL are capable of homing to the eye and exerting their tumoricidal effector function. Flow cytometry analysis of ocular cell suspensions with HLA-A*0201-gp100(154-162) tetrameric complexes confirmed the homing of adoptively transferred CTL. Therefore, the immune-privileged state of the eye permitted the outgrowth of xenogeneic uveal melanoma cells, but did not protect these tumors against adoptive immunotherapy with highly potent anti-tumor CTL. These data constitute the first direct indication that immunotherapy of human uveal melanoma may be feasible.
This article was published in J Immunol and referenced in Journal of Cytology & Histology

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