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Daiichi Seiyaku Co., Ltd.

Toshiyuki Hamaoka Daiichi Seiyaku Co., Ltd.

Toshiyuki Hamaoka

Tsuneo Kusama

Hiromi Fujiwara

Kayoko Tateishi

Masahiro Komiya

A process for producing an antibody having a high specificity to a first antigen and a low cross-reactivity with at least one second antigen, said first antigen comprising a desired antigenic determinant and said second antigen comprising at least one antigenic determinant which is structurally related to said desired antigenic determinant of said first antigen, which process comprises treating a mammal with a copolymer of D-glutamic acid and D-lysine coupled with said second antigen whereby to induce a substantially effective immunological tolerance to said second antigen and then immunizing said mammal with said first antigen. This process results in a higher productivity of a mammal cell capable of producing said desired antibody by culturing said mammal cell, for example, by forming a hybridoma with a suitable tumor cell and implanting the hybridoma into another mammal. The antibody or antiserum of this invention may with advantage be used for immunoassay such as radioimmunoassay.

Producing highly specific, low cross-reactive antibody by immunizing

Muramyldipeptide active ester derivatives represented by the formula: ##STR1## wherein R.sub.1 represents a straight or branched chain fatty acid residue having 2 to 30 carbon atoms; R.sub.2 represents an active ester residue; and 'Acyl' represents an acyl group having 2 to 6 carbon atoms. These compounds are applicable as haptens for the immunotherapy and exhibit antitumor activity.

Muramyldipeptide active ester derivatives

Muramylpeptide active ester derivatives represented by the formula: ##STR1## wherein R.sub.1 represents a hydrogen atom or a fatty acid residue having from 2 to 10 carbon atoms; --COR.sub.2 represents an active ester group; R.sub.3 represents a fatty acid residue having from 1 to 10 carbon atoms; X represents an alanine, N-methylalanine or valine residue; 'Acyl' represents a fatty acid residue having from 2 to 6 carbon atoms; and n represents an integer of from 1 to 6. These compounds are applicable as haptens for the immunotherapy and exhibit antitumor activity.

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Nara, Japan

Toshiyuki Hamaoka