Human plasma hyaluronidase

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/56 (2006.01) A61K 31/70 (2006.01) A61K 38/47 (2006.01) A61K 48/00 (2006.01) C07K 16/40 (2006.01) C12N 5/18 (2006.01) C12N 9/24 (2006.01) G01N 33/573 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2264484

The invention is based on the discovery of methods for purification of an acid active hyaluronidase found in human plasma (hpHAse), including both biochemical and immunoaffinity purification methods. The method of immunoaffinity purification of the invention is based on the discovery of a method for identifying antibodies that specifically bind native hpHAse (anti- native hpHAse antibodies), and anti-native hpHAse antibodies identified by this screening method. The invention also features an assay for sensitive detection of HAse activity using biotinylated hyaluronic acid (bHA). Purification and characterization of hpHAse lead to the inventors' additional discovery that hpHAse is encoded by the LuCa-1 gene, which gene is present in the human chromosome at 3p21.3, a region associated with tumor suppression. The invention additionally features methods of treating tumor-bearing patients by administration of hpHAse and/or transformation of cells with hpHAse- encoding DNA.

Cette invention est fondée sur la découverte de procédés de purification d'un hyaluronidase ayant une activité sur l'acide présent dans le plasma humain (hpHAse), y compris des procédés de purification biochimiques et d'immunoaffinité. Le procédé de purification d'immunoaffinité est fondée sur la découverte d'une méthode qui permet d'identifier des anticorps fixant spécifiquement le hpHAse naturel (anticorps anti-hpHAse natif) et des anticorps anti-hpHAse natif identifiés grâce à cette méthode de sélection. L'invention concerne également un dosage permettant une détection sensible de l'activité HAse à l'aide d'un acide hyaluronique biotinylé (bHA). La purification et la caractérisation de hpHAse ont abouti à une nouvelle découverte de l'inventeur selon laquelle hpHAse est codé par le gène LuCa-1 présent dans le chromosome humain à 3p21.3, une région associée à la suppression tumorale. L'invention concerne en outre des procédés de traitement de patients porteurs d'une tumeur par administration de hpHAse et/ou transformation de cellules au moyen de l'ADN codant hpHAse.

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