摘要:
A method of producing monoclonal antibodies that bind to tumor-associated gangliosides, the method comprising: (1) immunizing a host with tumor cells; (2) boosting the host with a suspension comprising a mixture of tumor cell membrane and at least one purified lactonized tumor-associated ganglioside; (3) boosting the host with an immunogen comprising a lactone of a tumor associated ganglioside adsorbed on or incorporated into a carrier; (4) fusing immunized cells from the host with myeloma cells to form hybridoma cells; (5) selecting hybridoma cells that produce antibody that binds to the ganglioside of step (3); (6) culturing the selected hybridoma cells; and (7) recovering the antibody.
摘要:
A method of producing monoclonal antibodies that bind to tumor-associated gangliosides, the method comprising: (1) immunizing a host with tumor cells; (2) boosting the host with a suspension comprising a mixture of tumor cell membrane and at least one purified lactonized tumor-associated ganglioside; (3) boosting the host with an immunogen comprising a lactone of a tumor associated ganglioside adsorbed on or incorporated into a carrier; (4) fusing immunized cells from the host with myeloma cells to form hybridoma cells: (5) selecting hybridoma cells that produce antibody that binds to the ganglioside of step (3); (6) culturing the selected hybridoma cells; and (7) recovering the antibody. Hybridomas and monoclonal antibodies produced by the above-described method. A passive immunization method for treatment of tumors containing gangliosides comprising administering to a subject: (A) a pharmaceutically effective amount of an antibody produced by the above described method. A method for detecting tumors containing gangliosides comprising: (A) contacting a test sample with an antibody produced by the above described method; and (B) assaying for the specific binding of the antibody to antigen in the test sample.
摘要:
A vaccine and method to prevent growth and replication of cancer cells that express a core structure of a mucin-type glycoprotein is disclosed. The vaccine comprises: (a) a pharmaceutically effective amount of an antigen comprising a purified mucin-type glycoprotein or a chemically synthesized mucin-type glycoprotein carbohydrate determinant conjugated to a carrier peptide or macromolecule, wherein said mucin-type glycoprotein expresses or carries the core structure of a mucin-type glycoprotein expressed on said cancer cells; and (b) a pharmaceutically acceptable carrier including natural or synthetic adjuvants. The method comprises administering the above-described vaccine to a host. A medicament and method for treating cancer wherein the cancer cells express a core structure of a mucin-type glycoprotein is disclosed. The medicament comprises: (a) a pharmaceutically effective amount of an anti-cancer antibody or fragment comprising a binding site thereof, said anti-cancer antibody having been produced against a purified core structure of a mucin-type glycoprotein; and (b) a pharmaceutically acceptable carrier, diluent or excipient. The method comprises administering the above-described medicament to a host.
摘要:
A method of producing monoclonal antibodies that bind to human cancer-associated mucin-type glycoprotein antigens comprising: (1) immunizing a host with a core structure of a mucin-type glycoprotein: (2) fusing splenocytes from said immunized host with myeloma cells to form hybridoma cells; (3) culturing said hybridoma cells on selective medium; (4) selecting hybridoma cells surviving step (3) that secrete antibody that binds to said core structure of a mucin-type glycoprotein; (5) cloning said selected hybridoma cells from step (4); (6) culturing said cloned hybridoma cells; and (7) recovering said antibody. Hybridomas and monoclonal antibodies produced by the above-described method. Methods of passive and active immunization employing the monoclonal antibodies and mucin-type glycoproteins or synthetic oligosaccharide-carrier conjugates.
摘要:
A method of producing monoclonal antibodies that bind to human cancer-associated mucin-type glycoprotein antigens comprising: (1) immunizing a host with a core structure of a mucin-type glycoprotein; (2) fusing splenocytes from said immunized host with myeloma cells to form hybridoma cells; (3) culturing said hybridoma cells on selective medium; (4) selecting hybridoma cells surviving step (3) that secrete antibody that binds to said core structure of a mucin-type glycoprotein; (5) cloning said selected hybridoma cells from step (4); (6) culturing said cloned hybridoma cells; and (7) recovering said antibody. Hybridomas and monoclonal antibodies produced by the above-described method. Methods of passive and active immunization employing the monoclonal antibodies and mucin-type glycoproteins or synthetic oligosaccharide-carrier conjugates.
摘要:
A process for preparing difucosyl Y.sub.2 antigen (dimeric Le.sup.x) , said process comprising: (1) preparing a lactonorhexaosylceramide backbone or a lactonorhexaosylsaccharide backbone linked to a carrier molecule; and (2) enzymatically fucosylating said backbone at the III.sup.3 and V.sup.3 positions through an .alpha.1.fwdarw.3 linkage. A process for preparing Le.sup.y antigen analogues, said process comprising: (1) preparing a lactonorhexaosyl-ceramide backbone or a lactonorhexaosylsaccharide backbone linked to a carrier molecule; and (2) enzymatically fucosylating said backbone at the terminal .beta.-Gal through an .alpha.1.fwdarw.2 linkage; and (3) enzymatically fucosylating said backbone at one or more positions through an .alpha.1.fwdarw.3 linkage, provided that steps (2) and (3) can be conducted simultaneously or in any order. A process for preparing a fucosylated lactonorhexaosylceramide, lactonorhexaosylsaccharide linked to a carrier molecule or higher analogues thereof, said process comprising: (1) preparing a lactonorhexaosylceramide backbone, a lactonorhexaosylsaccharide backbone linked to a carrier molecule or backbones of higher analogues thereof; and (2) enzymatically fucosylating one or more residues of said backbone. A process for preparing sialyl Le.sup.x and sialyl dimeric Le.sup.x.
摘要:
The genes defining the ABO histo-blood groups are disclosed. Methods for identification of histo-blood group ABO status are provided. The methods include the use of DNA probes or size separation of DNA fragments unique to a blood group status. The present invention also discloses DNA constructs, recombinant methods for providing histo-blood glycosyltransferases, methods for tumor suppression, purified histo-blood group glycosyltransferases, and antibodies produced therefrom which bind to protein epitopes.
摘要:
The genes defining the ABO histo-blood groups are disclosed. Methods for identification of histo-blood group ABO status are provided. The methods include the use of DNA probes or size separation of DNA fragments unique to a blood group status. The present invention also discloses DNA constructs, recombinant methods for providing histo-blood glycosyltransferases, methods for tumor suppression, purified histo-blood group glycosyltransferases, and antibodies produced therefrom which bind to protein epitopes.
摘要:
The invention relates to methods of preparing and purifying conjugates between Granulocyte Colony Stimulating Factor and PEG moieties. The conjugates are linked via an intact glycosyl linking group that is interposed between and covalently attached to the peptide and the modifying group. The conjugates are purified using various chromatography methods.
摘要:
This invention discloses the development of a novel platform for recombinant production of bioactive glycoproteins and cancer specific vaccines in plants. Plants and plant cell cultures have been humanized with respect to human mucin-type protein O-glycosylation. A panel of plant cell factories for production of recombinant glycoproteins with designed human O-glycosylation, including an improved cancer vaccine candidate, has been developed. The platform provides basis for i) production of an essentially unlimited array of O-glycosylated human glycoprotein therapeutics, such as human interferon α2B and podoplanin, and ii) for further engineering of additional cancer specific O-glycans on glycoproteins of therapeutical value. Currently, mammalian cells are required for human O-glycosylation, but plants offer a unique cell platform for engineering O-glycosylation since they do not perform human type O-glycosylation. Introduction of O-glycosylation into plant cells requires i) that wild-type plant cells do not modify the target peptide substrates and ii) that the appropriate enzymes and substrates are introduced into of plant cells such that O-glycosylation in the secretory pathway proceed and the glycosylated peptide substrates are preferentially exported to the exterior of the cell or accumulated in the cell. In this invention i) the integrity of transiently and stably expressed ‘mucin’ type target peptides in plants cells has been determined and ii) mucin-type O-glycosylation has been established in plants by transient and stable introduction of a Pseudomonas aeruginosa C4-epimerase, the human polypeptide GalNAc-transferases T2 and T4 (GalNAc-T2 and T4) and various human target peptides or proteins. In the present invention GalNAc-T2 and -T4 have been used to produce a Tn cancer glycoform of MUC1.