Bispecific molecules recognizing lymphocyte antigen CD2 and tumor antigens
First Claim
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1. A molecule which is a bispecific antibody fragment, comprising(a) a first binding site specific for an epitope on a tumor cell antigen and(b) a second binding site specific for an epitope of antigen CD2, selected from the group consisting of AIDC2.M1 and AICD2.M2,of the formulae BAb<
- X,AICD2.M1>
Y or BAb<
X,AICD2.M2>
Y, whereinBAb≦
indicates the molecule is a bispecific antibody,X is a first antibody determinant specific for an epitope on a tumor cell antigen,AICD2.M1 and AICD2.M2 are antibody determinants of antibodies AICD2.M1 and AICD2.M2, respectively, which are specific for antigen CD2, and≧
Y indicates the molecule is an antibody fragment.
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Abstract
The present invention relates to novel and highly effective bispecific antibody fragments which recognize lymphocyte CD2 antigen and any variable tumor antigen. Moreover, the invention relates to two new monoclonal antibodies terms AICD2.M1 and AICD2.M2. A combination of these antibodies, whereby at least one of them is a bispecific antibody fragment, can be used successfully in tumor therapy and diagnostics.
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17 Claims
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1. A molecule which is a bispecific antibody fragment, comprising
(a) a first binding site specific for an epitope on a tumor cell antigen and (b) a second binding site specific for an epitope of antigen CD2, selected from the group consisting of AIDC2.M1 and AICD2.M2, of the formulae BAb< - X,AICD2.M1>
Y or BAb<
X,AICD2.M2>
Y, whereinBAb≦
indicates the molecule is a bispecific antibody,X is a first antibody determinant specific for an epitope on a tumor cell antigen, AICD2.M1 and AICD2.M2 are antibody determinants of antibodies AICD2.M1 and AICD2.M2, respectively, which are specific for antigen CD2, and ≧
Y indicates the molecule is an antibody fragment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17)
- X,AICD2.M1>
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12. Monoclonal antibody AICD2.M1, which is specific for an epitope of antigen CD2, and is obtainable by isolation from hybridoma cell line 1 H 10 (DSM ACC2118).
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13. Monoclonal antibody AICD2.M2, which is specific for an epitope of antigen CD2, and is obtainable by isolation from hybridoma cell line 7 D 3 (DSM ACC2119).
Specification