Humanised antibody to integrin chain beta-1

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/13 (2006.01) C07K 16/00 (2006.01) C07K 16/28 (2006.01) C07K 16/46 (2006.01) C12N 5/10 (2006.01) C12N 7/01 (2006.01) C12N 15/86 (2006.01) C12N 15/866 (2006.01) C12P 21/08 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2199749

Variable domains of a non-human immunoglobulin are humanised by selecting DNA sequences coding for the variable domains of a human immunoglobulin wherein the amino acid sequence of the framework regions of variable domains VH and VL is 70-95 % homologous with the amino acid sequence of the framework regions of variable domains VH and VL of non-human immunoglobulin, and wherein hypervariable loops H1 and H2 or L1, L2 and L3 have the same kind of canonical structure as hypervariable loops H1 and H2 or L1, L2 and L3, respectively, of non-human immunoglobulin, and by replacing the oligonucleotide sequences coding for the CDRs of human immunoglobulin with oligonucleotide sequences coding for the corresponding CDRs of non-human immunoglobulin. The cloning, in a baculovirus, of DNA fragments that code for said humanised variable domains, and the expression of the resulting humanised recombinant antibody, are also disclosed. Murine monoclonal antibody K20 has thus been humanised and expressed according to the Invention.

L'invention est relative à l'humanisation des domaines variables d'une immunoglobuline non-humaine, par sélection de séquences d'ADN codant pour les domaines variables d'une immunoglobuline humaine dont la séquence en acides aminés des régions de charpente des domaines variables V H et V L présente entre 70 et 95 % d'homologie avec la séquence en acides aminés des régions de charpente des domaines variables V H et V L, de l'immunoglobuline non-humaine, et dont les boucles hypervariables H1 et H2 ou L1, L2 et L3 présentent respectivement le même type de structure canonique que les boucles hypervariables H1 et H2 ou L1, L2 et L3 de l'immunoglobuline non-humaine, et remplacement des séquences oligonucléotidiques codant pour les CDR de l'immunoglobuline humaine, par les séquences oligonucléotidiques codant pour les CDR correspondantes de l'immunoglobuline non-humaine. L'invention est également relative au clonage dans un baculovirus, de fragments d'ADN qui codent pour lesdits domaines variables humanisés, et à l'expression d'un anticorps recombinant humanisé obtenu de la sorte. L'anticorps monoclonal murin K20 a été ainsi humanisé et exprimé conformément à l'invention.

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