Identification and engineering of antibodies with variant fc...

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 16/00 (2006.01) A61K 39/395 (2006.01) A61P 35/00 (2006.01) C12N 15/13 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2573659

The present invention relates to molecules, particularly polypeptides, more particularly immunoglobins (e.g., antibodies), comprising a variant Fc region, wherein said variant Fc region comprises at least one amino acid modification relative to a wild-type Fc region, which variant Fc region binds Fc.gamma.RIIIA and/or Fc.gamma.RIIA with a greater affinity, relative to a comparable molecule comprising the wild-type Fc region. The molecules of the invention are particularly useful in preventing, treating, or ameliorating one or more symptoms associated with a disease, disorder, or infection. The molecules of the invention are particularly useful for the treatment or prevention of a disease or disorder where an enhanced efficacy of effector cell function (e.g., ADCC) mediated by Fc.gamma.R is desired, e.g., cancer, infectious disease, and in enhancing the therapeutic efficacy of therapeutic antibodies the effect of which is mediated by ADCC.

L'invention concerne des molécules, en particulier des polypeptides, et plus spécifiquement des immunoglobines (par exemple des anticorps), comprenant une zone de variants Fc. La zone de variants Fc comprend au moins une modification d'acide aminé associée à une zone Fc de type sauvage. La zone de variants Fc se lie à Fc.gamma.RIIIA et/ou à Fc.gamma.RIIA avec une plus grande affinité que celle d'une molécule comparable comprenant la zone Fc de type sauvage. Les molécules de l'invention sont particulièrement utiles pour prévenir, pour traiter ou pour soulager au moins un symptôme associé à une maladie, à un trouble, ou à une infection. Les molécules de l'invention sont particulièrement utiles pour traiter ou pour prévenir une maladie ou un trouble dans lesquels l'efficacité améliorée d'une fonction d'effecteur (par exemple, ADCC) médiée par Fc.gamma.R est voulue, par exemple, le cancer, une maladie infectieuse, et dans laquelle l'accroissement de l'efficacité thérapeutique des anticorps thérapeutiques est médiée par ADCC.

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