Antibody-metal ion complexes
First Claim
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1. A method for preparing an antibody-chelator conjugate, comprising:
- (a) reacting an antibody or antibody fragment with an oxidizing agent to form an aldehyde group in the carbohydrate moiety of the antibody or antibody fragment, in which the carbohydrate moiety is not part of nor directly involved with the antigen binding site of the antibody or antibody fragment; and
(b) reacting the aldehyde group of the resultant oxidized antibody or antibody fragment with a compatible chelator containing an amine group selected from the group consisting of primary amine, hydrazine, hydrazide, hydroxylamine, phenylhydrazine, semicarbazide and thiosemicarbazide groups to form a water-soluble antibody-chelator conjugate being characterized by (i) substantially the same immunospecificity as the unconjugated antibody or antibody fragment; and
(ii) aqueous solubility such that the antibody-chelator conjugate, when reacted with a metal ion, is suitable for in vivo administration.
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Abstract
This invention relates to antibody-metal ion complexes having a metal ion coordinately bound to a compatible chelator covalently bound to an antibody or antibody fragment. Also described are methods for intermediates in the preparation of antibody-metal ion complexes. Therapeutic and in vitro and in vivo diagnostic methods utilizing such antibody-metal ion complexes are described.
384 Citations
81 Claims
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1. A method for preparing an antibody-chelator conjugate, comprising:
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(a) reacting an antibody or antibody fragment with an oxidizing agent to form an aldehyde group in the carbohydrate moiety of the antibody or antibody fragment, in which the carbohydrate moiety is not part of nor directly involved with the antigen binding site of the antibody or antibody fragment; and (b) reacting the aldehyde group of the resultant oxidized antibody or antibody fragment with a compatible chelator containing an amine group selected from the group consisting of primary amine, hydrazine, hydrazide, hydroxylamine, phenylhydrazine, semicarbazide and thiosemicarbazide groups to form a water-soluble antibody-chelator conjugate being characterized by (i) substantially the same immunospecificity as the unconjugated antibody or antibody fragment; and
(ii) aqueous solubility such that the antibody-chelator conjugate, when reacted with a metal ion, is suitable for in vivo administration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16)
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11. A method for preparing an antibody-metal ion complex, comprising:
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(a) reacting an antibody or antibody fragment with an oxidizing agent to form an aldehyde group in the carbohydrate moiety of the antibody or antibody fragment, in which the carbohydrate moiety is not part of nor directly involved with the antigen binding site of the antibody or antibody fragment; (b) reacting the aldehyde group of the resultant oxidized antibody or antibody fragment with a compatible chelator containing an amine group selected from the group consisting of primary amine, hydrazine, hydrazide, hydroxylamine, phenylhydrazine, semicarbazide and thiosemicarbazide groups to form a water-soluble antibody-chelator conjugate; and (c) combining the antibody-chelator conjugate with a metal ion under conditions which allow chelation of the metal ion to the antibody-chelator conjugate to form a water-soluble antibody-metal ion complex being characterized by (i) substantially the same immunospecificity as the unconjugated antibody or antibody fragment and (ii) an aqueous solubility such that the antibody metal ion complex is suitable for in vivo administration. - View Dependent Claims (12, 13, 14, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method for preparing an antibody-metal ion complex, comprising:
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(a) reacting an antibody or antibody fragment with an oxidizing agent to form an aldehyde group in the carbohydrate moiety of the antibody or antibody fragment, in which the carbohydrate moiety is not part of nor directly involved with the antigen binding site of the antibody or antibody fragment; and (b) reacting the aldehyde group of the resultant oxidized antibody or antibody fragment with a chelator-metal ion complex, said chelator-metal ion complex comprising a compatible chelator-metal ion complex comprising a compatible chelator containing an amine group selected from the group consisting of primary amine, hydrazine, hydrazide, hydroxylamine, phenylhydrazine, semicarbazide and thiosemicarbazide groups coordinately bound to a metal ion, to form a water-soluble antibody-metal ion complex being characterized by (i) substantially the same immunospecificity as the unconjugated antibody or antibody fragment, and (ii) aqueous solubility such that the antibody-chelator metal ion complex is suitable for in vivo administration. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. An antibody-chelator conjugate, comprising:
- a compatible chelator attached through a covalent bond to a carbohydrate moiety of an oxidized antibody or antibody fragment, in which the carbohydrate moiety is not part or nor directly involved with the antigen binding site of the antibody or antibody fragment, said water-soluble antibody-chelator conjugate being characterized (i) substantially the same immunospecificity as the unconjugated antibody or antibody fragment, and (ii) aqueous solubility such that the antibody-chelator conjugate, when reacted with a metal ion, is suitable for in vivo administration.
- View Dependent Claims (54, 55, 56, 57, 58, 59, 60)
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61. An antibody-metal ion complex, comprising:
- an antibody-chelator conjugate comprising a compatible chelator attached through a covalent bond to a carbohydrate moiety of an oxidized antibody or antibody fragment, in which the carbohydrate moiety is not part of nor directly involved with the antigen binding site of the antibody or antibody fragment;
said water-soluble antibody-chelator conjugate coordinately bound through said compatible chelator to a metal ion to form a water-soluble antibody-metal ion complex being characterized by (i) substantially the same immunospecificity as the unconjugated antibody or antibody fragment, and (ii) aqueous solubility such that the antibody-chelator metal ion complex is suitable for in vivo administration. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
- an antibody-chelator conjugate comprising a compatible chelator attached through a covalent bond to a carbohydrate moiety of an oxidized antibody or antibody fragment, in which the carbohydrate moiety is not part of nor directly involved with the antigen binding site of the antibody or antibody fragment;
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79. A method for in vivo imaging a specific tissue, comprising:
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(a) administering to an animal or a human an effective amount of a water-soluble antibody metal ion complex which (i) is immunoreactive with and immunospecific for an antigenic determinant of the specific tissue and substantially non-immunoreactive with and non-immunospecific for non-specific tissue and the antigenic determinant is not found in substantial amounts in non-specific tissue; and (ii) comprises an antibody or antibody fragment, a compatible chelator and metal ion in which the compatible chelator is covalently bound to the antibody or antibody fragment at a carbohydrate moiety located outside the antigen binding region of the antibody or antibody fragment, and coordinately bound to the metal ion so that the antibody-metal ion complex is characterized by substantially the same immunospecificity as the antibody or antibody fragment and an aqueous solubility such that the antibody-metal ion complex is suitable for administration in vivo; and (b) detecting whether the antibody-metal ion complex localized at the specific tissue.
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80. A method for therapeutic treatment of a cellular disorder, comprising:
- administering to an animal or a human a therapeutically effective amount of a water-soluble antibody metal-ion complex which
(a) is immunoreactive with and immunospecific for a target site associated with the cellular disorder and substantially non-immunoreactive with and non-immunospecific for tissue not associated with the cellular disorder; and (b) which comprises an antibody or antibody fragment, a compatible chelator and a metal ion which emits cytotoxic beta or alpha particles, in which the compatible chelator is covalently bound to the antibody or antibody fragment at a carbohydrate moiety located outside the antigen binding region of the antibody or antibody fragment, and coordinately bound to the metal ion so that the antibody-metal ion complex is characterized by substantially the same immunospecificity as the antibody or antibody fragment and an aqueous solubility such that the antibody-metal ion complex is suitable for administration in vivo.
- administering to an animal or a human a therapeutically effective amount of a water-soluble antibody metal-ion complex which
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81. A method for testing for an antigen, comprising:
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(a) mixing a sample suspected of containing the antigen with a water-soluble antibody metal ion complex which (i) is immunoreactive with and immunospecific for the antigen; and (ii) which comprises an antibody or antibody fragment, a compatible chelator and metal ion in which the compatible chelator is covalently bound to the antibody or antibody fragment at a carbohydrate moiety located outside the antigen binding region of the antibody or antibody fragment, and coordinately bound to the metal ion so that the antibody-metal ion complex is characterized by substantially the same immunospecificity as the antibody or antibody fragment and an aqueous solubility such that the antibody-metal ion complex is suitable for administration in vivo; and (b) detecting any interaction of the antibody-metal ion complex with the sample.
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Specification