Method of forming vertebrate pancreas in vitro

C - Chemistry – Metallurgy – 12 – N

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C12N 5/071 (2010.01) A61K 35/39 (2006.01) A61P 1/18 (2006.01) C12Q 1/02 (2006.01) G01N 33/50 (2006.01) A61K 35/12 (2006.01)

Patent

CA 2407287

The present invention provides a pancreas induced in vitro which enables to obtain knowledge regarding the mechanisms of differentiation and formation of pancreas that is useful for developmental engineering and organ engineering, and organ engineering, a pancreas for transplantation by which it can be evaluated whether or not a pancreas induced in vitro can function in practice in vivo, and a method wherein a pancreas induced in vitro which contributes to the development of diagnosis and treatment of pancreas disorder for higher animals, can artificially and efficiently be induced from a gastrula apart from the presumptive region of pancreas. Pancreas is formed in vitro by treating the blastopore upper lip of an early gastrula of a vertebrate such as Xenopus with retinoic acid in vitro, and then culturing. The treatment with retinoic acid can be carried out, for example, by treating with retinoic acid at a concentration of 10-5 M or above for three hours.

L'invention concerne un procédé de production <i>in vitro</i> d'un pancréas. Ce procédé permet de collecter des observations sur les mécanismes de différenciation et de formation du pancréas. Il est pas conséquent utile pour les techniques de développement ou de production d'organes. L'invention concerne également un pancréas destiné à une transplantation, permettant d'évaluer si oui ou non un pancréas produit <i>in vitro</i> peut fonctionner <i>in vivo</i>, ou permettant de contribuer à la mise au point de diagnostics et de traitements pour les animaux d'espèces supérieures. Ce pancréas peut être cultivé artificiellement et efficacement à partir d'une gastrula dont on a séparé la région de formation prospective du pancréas. On produit ce pancréas in vitro en traitant la lèvre supérieure du blastopore d'un vertébré tel que Xenopus avec de l'acide rétinoïque, puis en le mettant en culture. Ce traitement à l'acide rétinoïque peut par exemple comprendre un traitement de 3 heures avec un acide rétinoïque à une concentration égale ou supérieure à 10?-5¿M.

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