Methods of preparing organs for cryopreservation and...

A - Human Necessities – 01 – N

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A01N 1/02 (2006.01)

Patent

CA 2197773

The invention relates to the field of organ and tissue perfusion. More particularly, the present invention relates to a method for preparing organs, such as the kidney and liver, for cryopreservation through the introduction of vitrifiable concentrations of cryoprotectant into them. To prepare the organ for cryopreservation, the donor human or animal, is treated in the usual manner and may also be treated with iloprost, or other vasodilators, and/or transforming growth factor .beta.1. Alternatively, or additionally, the organ which is to be cryopreserved can be administered iloprost, or other vasodilators, and/or transforming growth factor .beta.1 directly into its artery. The invention also relates to preparing organs for transplantation by a method for the removal of the cryoprotectant therefrom using low (such as raffinose, sucrose, mannitol, etc.), medium (such as agents with intermediate molecular weights of around 600-2,000) and high (such as hydroxyethyl starch) molecular weight agents osmotic buffering agents. The invention is also directed to new post-transplantation treatments such as the use of transforming growth factor .beta.1, N-acetylcysteine and aurothioglucose.

L'invention a trait au domaine de la perfusion d'organes et de tissus et plus particulièrement à la préparation d'organes tels que les reins et le foie en vue de leur cryopréservation par l'introduction, dans ces organes, de concentrations vitrifiables de cryoprotecteurs. Pour préparer l'organe en vue de sa cryopréservation, le donneur, homme ou animal, est traité de la manière habituelle, ou par l'iloprost ou d'autres vasodilatateurs et/ou le facteur transformant de croissance .beta.1. En outre, ou selon une variante, on peut administrer à l'organe à cryopréserver, l'iloprost ou d'autres vasodilatateurs et/ou du facteur transformant de croissance .beta.1 par injection directe dans les artères. L'invention porte également sur la préparation d'organes en vue de leur transplantation selon un procédé d'extraction du cryoprotecteur faisant appel à des tampons osmotiques de poids moléculaire faible (tel que le raffinose, le saccharose, le mannitol, etc.), moyen (tels que des agents de poids moléculaire intermédiaire compris entre 600 et 2000) ou élevé (tels que l'hydroxyéthyl amidon). L'invention porte en outre sur de nouveaux traitements postérieurs à la transplantation, consistant notamment à utiliser du facteur transformant de croissance .beta.1, de la N-acétylcystéine et de l'aurothioglucose.

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