Immunotoxin and method of making

A - Human Necessities – 61 – K

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167/129, 195/1.1

A61K 39/00 (2006.01) A61K 47/48 (2006.01)

Patent

CA 1259920

- - IMMUNOTOXIN AND METHOD OF MAKING Abstract of the Disclosure Immunotoxins having improved toxic activity have the composition Image wherein Toxin-NH is a ribosome-inactivating protein containing no accessible sulfhydryl groups, n is an integer from 1 to 5, m is an integer from 1 to 5, and NH-Antibody is a monoclonal antibody specific to eucaryotic cells or antigens associated therewith. The immunotoxins are made by reacting the Toxin-NH with an iminothiolester salt to form a first conjugate, reacting the NH-Antibody with N-succinimidyl-3-(2-pyridyldithio) propionate to form a second conjugate, and reacting the two conjugates to form the immunotoxin.

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