Cyclosporin immunoassay
First Claim
1. A cyclosporin compound conjugated to an organic radical at an alanine nitrogen atom of said cyclosporin, wherein said compound is useful in an immunological determination, and further wherein,said organic radical is an immunogenic carrier comprising a poly(amino acid) having a molecular weight greater than 2000;
- a ligand;
a residue of a small organic compound, wherein said small organic compound has a molecular weight less than about 2000;
or a label;
said organic radical is conjugated to the cyclosporin through a linking group selected from the group consisting of;
(A) an alkyleneoxide chain of the formula --(CH2)n O--, wherein an alanine nitrogen atom of cyclosporin is conjugated to a carbon atom of the alkyleneoxide, n is an integer of 1 to 6, the alkyleneoxide oxygen atom is bound to a first end of from 1 to 3 carboxamide groups linked together by alkylene chains, and the organic radical is bound to a second end of the from 1 to 3 carboxamide groups;
or(B) a carbonyloxybenzyl group of the formula;
##STR18## wherein an alanine nitrogen atom of cyclosporin is conjugated to the benzylic carbon atom, an oxygen atom of the carbonyloxy group is bound to a first end of from 1 to 3 carboxamide groups linked together by alkylene chains, and the organic radical is bound to a second end of the from 1 to 3 carboxamide groups;
such that if the linking group is the carboxamide extended alkyleneoxide chain, then the alanine nitrogen is part of cyclosporin amino acid residue no. 7, and if the linking group is the carboxamide extended carbonyloxybenzyl group, then the alanine nitrogen is part of cyclosporin amino acid residue no. 7, 8, or nos. 7 and 8.
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Accused Products
Abstract
A method of measuring the amount of cyclosporin in a sample suspected of containing cyclosporin is disclosed. A method of inactivating interfering cross-reactive material in an assay for measuring the amount of cyclosporin in a sample suspected of containing cyclosporin is also disclosed. Compositions wherein cyclosporin is conjugated to an immunogenic carrier or a label, optionally through a linking group, at an alanine nitrogen atom of the cyclic backbone of cyclosporin are also disclosed. Compositions wherein atiocyclosporin is conjugated, optionally through a linking group, to an immunogenic carrier or a label are also disclosed. Where cyclosporin is conjugated to an immunogenic carrier, the conjugates may be used as immunogens for the preparation of antibodies which are capable of recognizing cyclosporin. Where atiocyclosporin is conjugated to an immunogenic carrier, the conjugates may be used as immunogens for the preparation of antibodies which are capable of recognizing interfering cross-reactive material but substantially incapable of recognizing cyclosporin or cyclosporin-label conjugates. Where cyclosporin is conjugated to a label, the conjugates may be used as part of a signal producing system in cyclosporin assays. Both the antibodies and label conjugates are useful in the disclosed assay methods.
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Citations
38 Claims
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1. A cyclosporin compound conjugated to an organic radical at an alanine nitrogen atom of said cyclosporin, wherein said compound is useful in an immunological determination, and further wherein,
said organic radical is an immunogenic carrier comprising a poly(amino acid) having a molecular weight greater than 2000; - a ligand;
a residue of a small organic compound, wherein said small organic compound has a molecular weight less than about 2000;
or a label;said organic radical is conjugated to the cyclosporin through a linking group selected from the group consisting of; (A) an alkyleneoxide chain of the formula --(CH2)n O--, wherein an alanine nitrogen atom of cyclosporin is conjugated to a carbon atom of the alkyleneoxide, n is an integer of 1 to 6, the alkyleneoxide oxygen atom is bound to a first end of from 1 to 3 carboxamide groups linked together by alkylene chains, and the organic radical is bound to a second end of the from 1 to 3 carboxamide groups;
or(B) a carbonyloxybenzyl group of the formula;
##STR18## wherein an alanine nitrogen atom of cyclosporin is conjugated to the benzylic carbon atom, an oxygen atom of the carbonyloxy group is bound to a first end of from 1 to 3 carboxamide groups linked together by alkylene chains, and the organic radical is bound to a second end of the from 1 to 3 carboxamide groups;such that if the linking group is the carboxamide extended alkyleneoxide chain, then the alanine nitrogen is part of cyclosporin amino acid residue no. 7, and if the linking group is the carboxamide extended carbonyloxybenzyl group, then the alanine nitrogen is part of cyclosporin amino acid residue no. 7, 8, or nos. 7 and 8. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 35)
- a ligand;
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27. A compound comprising a cyclosporin conjugated via a linking group to an organic radical at an alanine nitrogen atom of said cyclosporin, said compound being useful in an immunological determination;
wherein said linking group is selected from the group consisting of;
##STR21## wherein the organic radical is an immunogenic carrier, a ligand, or a label.- View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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36. A compound of the formula:
- ##STR22## wherein either B1 or B2 is hydrogen and the other is a linking group selected from the group consisting of;
##STR23## wherein the linking group connects an alanine nitrogen atom of amino acid residue No. 7 or No. 8 to an immunogenic poly(amino acid) having a molecular weight of at least 2000.
- ##STR22## wherein either B1 or B2 is hydrogen and the other is a linking group selected from the group consisting of;
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37. A cyclosporin A compound conjugated to an organic radical at an alanine nitrogen atom of said cyclosporin, wherein said compound is useful in an immunological determination, and further wherein,
said organic radical is an immunogenic carrier or an enzyme conjugated to the cyclosporin A through a linking group selected from the group consisting of: -
(A) an alkyleneoxide of the formula --(CH2)2 O--, wherein the alanine nitrogen atom of cyclosporin is conjugated to a carbon atom of the alkyleneoxide, the alkyleneoxide oxygen atom is bound to a first end of 1 carboxamide group linked together by alkylene chains, and the organic radical is bound to a second end of the carboxamide group;
or(B) a carbonyloxybenzyl group of the formula;
##STR24## wherein the alanine nitrogen atom of cyclosporin is conjugated to the benzylic carbon atom, the carbonyloxy group is para to the benzylic carbon, an oxygen atom of the carbonyloxy group is bound to a first end of 2 carboxamide groups linked together by alkylene chains, and the organic radical is bound to a second end of the 2 carboxamide groups;such that if the linking group is the carboxamide extended, alkyleneoxide chain, then the alanine nitrogen is part of cyclosporin amino acid residue no. 7, and if the linking group is the carboxamide extended carbonyloxybenzyl group, then the alanine nitrogen is part of cyclosporin amino acid residue no. 7 or 8; wherein the immunogenic carrier is selected from the group consisting of keyhole limpet hemocyanin (KLH) or bovine serum albumin (BSA);
orwherein the enzyme is glucose-6-phosphate dehydrogenase.
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38. A compound comprising a cyclosporin conjugated via a linking group to an organic radical at an alanine nitrogen atom of said cyclosporin, said compound being useful in an immunological determination;
wherein said linking group is selected from the group consisting of;
##STR25## wherein the organic radical is an immunogenic carrier, a ligand, or a label.
Specification