Method for conversion of blood type

A - Human Necessities – 01 – N

Patent

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A01N 1/02 (2006.01) A01N 63/00 (2006.01) A61K 35/18 (2006.01)

Patent

CA 2272925

The present invention relates to an improved method for enzymatically removing blood type-specific antigens from erythrocytes, comprising titrating the pH of the erythrocytes first to a pH suitable for enzyme activity and then, once the desired extent of antigen removal has been achieved, to a pH appropriate for storage and/or transfusion. The buffers used for titration have pH values significantly above or below the target pHs for erythrocyte conversion or storage/transfusion. The invention is based, at least in part, on the discovery that the structural integrity of the erythrocytes is not substantially disrupted by titration. The present invention further relates to methods wherein the addition of polyethylene glycol improves the efficiency of enzymatic removal of erythrocyte antigens.

L'invention concerne une méthode améliorée permettant d'éliminer des érythrocytes, par action enzymatique, les antigènes spécifiques de type. Selon la méthode, on titre le pH des érythrocytes d'abord sur un pH convenant pour l'activité enzymatique, puis, quand l'élimination désirée des antigènes est achevée, sur un pH convenant pour le stockage et/ou la transfusion. Les tampons utilisés pour le titrage ont un pH significativement supérieur ou inférieur au pH cible nécessaire à la conversion des érythrocytes ou au stockage et/ou à la transfusion. L'invention est basée, au moins en partie, sur la découverte que l'intégrité structurelle des érythrocytes n'est pas sensiblement perturbée par le titrage. L'invention concerne également des méthodes selon lesquelles l'adjonction de polyéthylène glycol accroît l'élimination enzymatique des antigènes érythrocytaires.

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