Biological products

Abstract

There is disclosed antibody molecules containing at least one CDR derived from a mouse monoclonal antibody having specificity for human CD22. There is also disclosed a CDR grafted antibody wherein at least one of the CDRs is a modified CDR. Further disclosed are DNA sequences encoding the chains of the antibody molecules, vectors, transformed host cells and uses of the antibody molecules in the treatment of diseases mediated by cells expressing CD22.

What is claimed is: 
     
         1 . A DNA sequence encoding a murine anti-CD22 monoclonal antibody, wherein the variable domain of the light chain has the sequence given in SEQ ID NO:7 and the variable domain of the heavy chain has the sequence given in SEQ ID NO:8. 
     
     
         2 . The DNA sequence of  claim 1 , wherein the light chain variable domain is encoded by SEQ ID NO:48. 
     
     
         3 . The DNA sequence of  claim 1 , wherein the heavy chain variable domain is encoded by SEQ ID NO:49. 
     
     
         4 . The DNA sequence of  claim 2 , wherein the heavy chain variable domain is encoded by SEQ ID NO:49. 
     
     
         5 . A cloning or expression vector comprising a DNA according to  claims 1 - 4   
     
     
         6 . A host cell comprising a cloning or expression vector according to  claim 5 . 
     
     
         7 . A DNA sequence encoding a chimeric antibody molecule, wherein the variable domain of the light chain has the sequence given in SEQ ID NO: 7 and the variable domain of the heavy chain has the sequence given in SEQ ID NO:8. 
     
     
         8 . The DNA sequence of  claim 7 , wherein the light chain variable domain is encoded by SEQ ID NO:48. 
     
     
         9 . The DNA sequence of  claim 7 , wherein the heavy chain variable domain is encoded by SEQ ID NO:49. 
     
     
         10 . The DNA sequence of  claim 8 , wherein the heavy chain variable domain is encoded by SEQ ID NO:49. 
     
     
         11 . A cloning or expression vector comprising a DNA according to  claims 7 - 10 . 
     
     
         12 . A host cell comprising a cloning or expression vector according to  claim 11 . 
     
     
         13 . A DNA sequence encoding an antibody or fragment thereof comprising a light chain variable domain and a heavy chain variable domain, wherein the antibody or fragment thereof is expressed in a mammalian cell and wherein the light chain variable domain has a sequence set forth in SEQ ID NO:7 and the heavy chain variable domain has a sequence set forth in SEQ ID NO:8. 
     
     
         14 . The DNA sequence of  claim 13 , wherein the light chain variable domain is encoded by SEQ ID NO:48. 
     
     
         15 . The DNA sequence of  claim 13 , wherein the heavy chain variable domain is encoded by SEQ ID NO:49. 
     
     
         16 . The DNA sequence of  claim 14 , wherein the heavy chain variable domain is encoded by SEQ ID NO:49. 
     
     
         17 . A cloning or expression vector comprising a DNA according to  claims 13 - 16 . 
     
     
         18 . A host cell comprising a cloning or expression vector according to  claim 17 .