HPV epitopes targeted by T cells infiltrating cervical malignancies for use in vaccines

Abstract

The present invention relates to novel CD4+ and CD8+ T cell epitopes that are specific for HPV-specific E6 and E7 oncoproteins, to peptides comprising these novel T cell epitopes, and to (vaccine) compositions comprising these peptides for use in methods for the prevention and / or treatment of HPV related diseases. Preferred epitopes are recognized by a T cell that infiltrates a cervical neoplastic lesion or by a T cell from a draining lymph node, and are presented by an HLA-DQ or HLA-DP molecule, or an HLA-B.

Description

RELATED APPLICATIONS[0001]This present invention is a continuation patent application that claims priority to PCT patent application number PCT / NL2008 / 050320, filed on May 27, 2008, European Patent Application No. 07109281.1, filed on May 31, 2007, European Patent Office Application No. 07109287.8, filed on May 31, 2007, which claims the benefit of U.S. Provisional Patent Application No. 61 / 941,070, filed on May, 31, 2007, the entirety of which are herein incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to the fields of medicine and immunology. In particular it relates to novel HPV epitopes that may be used in the prevention, therapy and / or diagnosis of HPV associated diseases.BACKGROUND OF THE INVENTION[0003]Cervical cancer is the second most common cancer worldwide (Bosch et al. 2003). High risk human papilloma virus (HPV) type 16 and 18 are the cause of cervical cancer in around two third of all patients (Bosch et al. 1995, Munoz et al. 2003). T...

AI Technical Summary

Benefits of technology

[0013]In one aspect, the present invention thus relates to amino acid sequences of newly identified CD4+ Th and CD8+ CTL cell epitopes of HPV, as well as HPV derived synthetic peptides and immunogenic compositions comprising these are also part of the present invention. Such peptides result in a much improved, enhanced and prolonged CD8+ CTL effector and memory response upon administration in a wide range of patients with HPV associated disease, including HPV related malignancies. Such peptides can also induce a much improved pro-inflammatory microenvironmnent that is more likely to be infiltrated by effector cells, as the result of this CD4+ Th response.

[0028]Moreover, in vitro and ex vivo T cell experiments are preferably used to confirm the capability of peptides according to the invention to induce substantial CD4+ Th and CD8+ CTL responses. The peptides of the present invention thereby provide a marked improvement in the selection of relatively short peptides that may be chemically synthesized, comprising the most potent and most widely applicable HLA class I and / or class II presented T cell epitopes derived from the HPV E6 and E7 tumor antigens. The peptides are particularly optimized with respect to their proteasomal cleavage and preferably contain at least one of HLA class I and class II epitopes and more preferably both HLA class I and class II epitopes. The liberation of the C-termini of CTL epitopes contained within the peptides of the invention by the 20S proteasome provides HLA class I binding fragments with CD8+ CTL stimulatory capacity.

[0050]The medicament as used in the invention has another advantage, which is that by intradermally administering low amounts of a peptide as earlier herein defined, an immunogenic effect may still be achieved. The amount of each peptide used is preferably ranged between 1 and 1000 μg, more preferably between 5 and 500 μg, even more preferably between 10 and 100 μg.

[0055]Another crucial advantage of the medicament of the invention is that relatively low amounts of peptides may be used, in one single shot, in a simple formulation and without any adjuvant known to give undesired side-effects as Montanide ISA-51. Without wishing to be bound by any theory, we believe the HPV intradermal peptide(s) used in the invention specifically and directly targets the epidermal Langerhans cells (LC) present in the epithelium. Langerhans cells are a specific subtype of DC which exhibit outstanding capacity to initiate primary immune responses (Romani N. et al 1992). These LC may be seen as natural adjuvants recruited by the medicament used in the invention.

[0059]We expect the combination of an intradermal and a subcutaneous administration of a medicament according to the invention is advantageous. DC in the epidermis are clearly different from DC in the dermis and in the subcutis. The intracutaneous (intradermal) immunization will cause antigen processing and activation of epidermal DC (Langerin-positive langerhans cells) that through their dendritic network are in close contact with the keratinocytes. This, will also optimally activate inflammatory pathways in the interactions between Langerhans cell and keratinocytes, followed by trafficking of antigen loaded and activated Langerhans cell to the skin-draining lymph nodes.

Problems solved by technology

2007) but in-depth knowledge on the specificity and type of the T cells infiltrating these cervical tumors is still lacking, probably due to the relative difficulties to establish T cell cultures from tumor tissue.

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