Production of antibodies and to medical uses involving antibodies

A method of producing antibodies that are specific to hidden epitopes of immunoglobulin light chains, hidden epitopes being epitopes that are hidden when a light chain is bound to a heavy chain and which are not available for binding to antibodies in an intact immunoglobulin, the method comprising administering to an animal source of antibodies having an immune system intact IgG as a tolerogen and also administering to the animal antibodies specific to IgG Fc, wherein the antibodies specific to IgG Fc and the intact IgG are administered simultaneously or sequentially, and also immunising with free light chain, wherein the free light chain is administered simultaneously or sequentially with intact IgG tolerogen and antibodies to IgG Fc.

A method of producing antibodies that are specific to hidden epitopes of immunoglobulin light chains, said hidden epitopes being epitopes that are hidden when a light chain is bound to a heavy chain and which are not available for binding to antibodies in an intact immunoglobulin, the method comprising administering to animal intact IgG as a tolerogen and then administering to the animal antibodies specific to IgG Fc at the time of immunising the animal with free light chain.

A method of producing antibodies that are specific to hidden epitopes of immunoglobulin light chains, said hidden epitopes being epitopes that are hidden when a light chain is bound to a heavy chain and which are not available for binding to antibodies in an intact immunoglobulin, the method comprising administering to an animal intact IgG as a tolerogen and then administering to the animal antibodies specific to IgG Fc at the time of immunizing the animal with free light chain, and wherein the method further comprises using an animal which is naïve to the intact IgG administered as a tolerogen.

A method of producing antibodies that are specific to hidden determinants of immunoglobulin light chains, said hidden determinants being epitopes that are hidden when a light chain is bound to a heavy chain and which are not available for binding to antibodies in an intact immunoglobulin, the method comprising tolerising an antibody producing animal with immunoglobulin paraprotein having bound light chains and with antibodies to exposed determinants of the immunoglobulin paraprotein with bound light chains, with hidden determinants of the bound light chains not being available for binding to antibodies of the animal and immunizing the animal with free light chains of the immunoglobulin paraprotein, wherein the antibodies to exposed determinants of the immunoglobulin paraprotein with bound light chains are specific to an Fc region of the immunoglobulin.

A method of producing antibodies that are specific to hidden epitopes of immunoglobulin light chains, said hidden epitopes being epitopes that are hidden when a light chain is bound to a heavy chain and which are not available for binding to antibodies in an intact immunoglobulin, the method comprising, injecting an animal, as a source of antibodies, with free light chain, tolerizing with intact immunoglobulin and antibodies that bind only to parts of immunoglobulin that are not the hidden epitopes and that do not bind to said hidden epitopes of said light chains, wherein the antibodies that bind only to parts of immunoglobulin that are not the hidden epitopes and that do not bind to said hidden epitopes of said light chains are specific to an Fc region of the immunoglobulin.

A method of making antibodies specific for epitopes on free immunoglobulin light chains which are hidden and will not be available for binding in an intact immunoglobulin but are exposed on free immunoglobulin light chains comprising tolerising the immune system of a first non-human animal source of antibodies with immunoglobulin with bound immunoglobulin light chain and with antibodies to exposed epitopes of the immunoglobulin, wherein the antibodies to exposed epitopes of the immunoglobulin are specific to an Fc region of the immunoglobulin;

• and immunizing the first source of antibodies with free immunoglobulin light chain and allowing the first source of antibodies to produce antibodies specific for the free immunoglobulin light chain, and extracting said antibodies to the hidden epitopes produced from the first source, and in which a second source of antibodies is used to produce the antibodies to the exposed epitopes of the immunoglobulin which second source is not the same individual non-human animal source as the first source that is later used to produce the antibody to the hidden epitopes on the free immunoglobulin light chains, and in which the first source chosen to produce the antibody to the free immunoglobulin light chain has not been immunized with the immunoglobulin beforehand.

A method of making antibodies specific for determinants on free immunoglobulin light chains which are hidden and will not be available for binding in an intact immunoglobulin but are exposed on free immunoglobulin light chains, comprising tolerising an antibody-producing non-human animal with intact immunoglobulin with bound light chains and antibodies to the exposed determinants on the intact immunoglobulin, wherein the antibodies to the exposed determinants on the intact immunoglobulin are specific to an Fc region of the intact immunoglobulin;

• and immunizing the animal with free immunoglobulin light chains of the immunoglobulin, and allowing the animal to produce antibodies to the hidden determinant exposed on the free immunoglobulin light chain, and extracting antibodies from the animal specific for the hidden determinants exposed on the free immunoglobulin light chains.