Human monoclonal antibodies to the hepatitis b surface antigen

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 5/28 (2006.01) A01K 67/027 (2006.01) A61K 39/42 (2006.01) C07K 16/08 (2006.01) G01N 33/576 (2006.01) G01N 33/577 (2006.01) A61K 38/00 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2254931

Disclosed is a process for obtaining hybridoma cell lines which produce human antibodies capable of binding to the hepatitis B virus surface antigen (HBVsAg), as well as the hybridoma cell lines, and antibodies produced by the cell lines. Also disclosed are various uses of said antibodies in the prevention and treatment of HBV infection. Peripheral blood lymphocytes obtained from human donors having a high titer of anti HBVsAg antibodies are engrafted into normal strains of mice which were lethally irradiated and radioprotected with SCID bone marrow. After immunization of such chimeric mice with HBVsAg, human cells are obtained from the mice spleens and fused in vitro with heteromyeloma cells to generate hybridomas secreting human antibodies having a high affinity and specificity to HBVsAg.

Procédé de préparation de lignées cellulaires d'hybridomes produisant des anticorps humains aptes à se lier à l'antigène de surface du virus de l'hépatite B (HBVsAg), lignées cellulaires d'hybridomes ainsi obtenues, et anticorps produits par ces lignées cellulaires. On a également prévu différentes applications de ces anticorps à la prévention et au traitement de l'infection par le VHB. On greffe sur des souches normales de souris les lymphocytes circulant dans le sang périphérique de donneurs humains présentant un titre élevé d'anticorps anti-HBVsAg, lesdites souris ayant été soumises à une irradiation à une dose mortelle, et radioprotégées par de la moelle osseuse SCID. A la suite de l'immunisation de ces souris chimériques par l'HBVsAg, on obtient des cellules humaines à partir des rates des souris et on effectue leur fusion in vitro avec des cellules hétéromyélomateuses afin de créer des hybridomes sécrétant des anticorps humains présentant une affinité et une spécificité élevées vis-à-vis du HBVsAg.

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