Anti-tumour immunity induction by a non-replicatmg...

A - Human Necessities – 61 – K

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A61K 48/00 (2006.01) A61P 35/00 (2006.01) A61P 35/04 (2006.01) A61P 37/04 (2006.01) C12N 15/861 (2006.01) G01N 33/68 (2006.01)

Patent

CA 2672784

Impaired transporter-associated-with-antigen-processing (TAP) expression is associated with downregulation of MHC class 1 antigen expression in many tumours, including melanoma, making the tumours invisible to effector cytotoxic T cells. Restoration of TAP expression revives immunosurveillance mechanisms, leading to anti-tumour responses and enhanced memory T-cell subpopulations. The present invention comprises the use of TAP-1 for treatment of cancers in a human patient, wherein the cancer has cells that are deficient in MHC class 1 antigen presentation. The cancer cells are transfected in low doses with a vector encoding TAP-1, and the TAP-1 expression or activity elicits a memory T cell response directed to an endogenous cancer cell antigen.

L'expression défectueuse d'un transporteur associé au traitement de l'antigène (TAP) est associée à une régulation négative de l'expression d'un antigène du CMH de classe 1 dans de nombreuses tumeurs, comprenant le mélanome, rendant les tumeurs invisibles aux lymphocytes T cytotoxiques effecteurs. La restauration de l'expression de TAP ranime des mécanismes d'immunosurveillance, conduisant à des réponses antitumorales et à des sous-populations accrues de lymphocytes T mémoire. La présente invention comprend l'utilisation de TAP-1 pour le traitement de cancers dans un patient humain, le cancer ayant des cellules qui sont déficientes en présentation d'un antigène de CMH de classe 1. Les cellules cancéreuses sont transfectées en faibles doses par un vecteur codant pour TAP-1, et l'expression ou l'activité TAP-1 déclenche une réponse des lymphocytes T mémoire dirigée contre un antigène endogène de cellules cancéreuses.

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