Method for screening peptides for use in immunotherapy

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/62 (2006.01) A61K 38/17 (2006.01) A61K 39/00 (2006.01) A61P 31/12 (2006.01) C07H 21/00 (2006.01) G01N 33/569 (2006.01)

Patent

CA 2416761

The invention concerns a method for identifying sub-dominant/cryptic epitopes exhibited by a class I HLA molecule, said method comprising at least the following steps: a) selecting, from the sequence of a protein with respect to which it is desired to induce a cytotoxic T lymphocyte response, at least a peptide sequence of 8 to 11 amino acids capable of constituting an epitope of said protein exhibited by a class I HLA molecule, and corresponding to a peptide with low affinity for said class I HLA molecule and non-immunogenic; b) preparing, for each selected sequence, a variant peptide derived from said sequence, by substituting the N-terminal amino acid with a tyrosine residue; c) determining the immunogenicity of each variant peptide obtained at step b) by selecting, among the latter, each immunogenic peptide, generating a CTL response specific to the target cells expressing the protein wherefrom it is derived and identifying the peptide sequence wherefrom said immunogenic peptide is derived. The invention is applicable to screening of peptides for use in immunotherapy.

Procédé d'identification d'épitopes sous-dominants/cryptiques présentés par une molécule HLA de classe I ; ce procédé comprend au moins les étapes suivantes :a) le choix, à partir de la séquence d'une protéine vis-à-vis de laquelle on souhaite induire une réponse cytotoxique T, d'au moins une séquence peptidique de 8 ô 11 acides aminés susceptible de constituer un épitope de ladite protéine présenté par une molécule HLA de classe I, et correspondant ô un peptide ô faible affinité pour ladite molécule HLA de classe I et non-immunogène ;b) la préparation, pour chaque séquence sélectionnée, d'un peptide variant dérivé de ladite séquence par substitution de l'acide aminé N-terminal par un résidu tyrosine ; c) la détermination de l'immunogénicité de chaque peptide variant obtenu ô l'étape b) par la sélection, parmi ceux-ci, de chaque peptide immunogène, générant une réponse CTL spécifique vis-à-vis de cellules cibles exprimant la protéi ne dont il est issu et l'identification de la séquence peptidique dont dérive ledit peptide immunogène.Applications dudit procédé au criblage de peptides utilisables en immunothérapie.

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