Tolerogenic antigen-presenting cells

C - Chemistry – Metallurgy – 12 – N

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C12N 5/0784 (2010.01) A61P 37/02 (2006.01) A61K 35/12 (2006.01)

Patent

CA 2480751

It has been found that dendritic cells can be prepared which cannot mature. These cells can provide signal (1) to T cells but cannot provide co- stimulatory signal (2). T cells which are stimulated by the permanently immature dendritic cells therefore anergise, so the dendritic cells are tolerogenic rather than immunogenic. The cells are generally CD40-ve, CD80-ve and CD86-ve, and remain so when stimulated by inflammatory mediators such as lipopolysaccharide. The cells can be prepared conveniently by the culturing adherent embryonic stem cells in the presence of GM-CSF.

Il a été découvert qu'il est possible de préparer des cellules dendritiques ne pouvant pas parvenir à maturation. Ces cellules peuvent fournir un signal (1) aux lymphocytes T, mais ne peuvent fournir un signal co-stimulant (2). Les lymphocytes T stimulés par les cellules dendritiques immatures à titre permanent se trouvent de ce fait en état d'anergie, si bien que les cellules dendritiques sont plutôt tolérogènes qu'immunogènes. Les cellules sont généralement CD40?-ve¿, CD80?-ve¿ et CD86?-ve¿ et demeurent ainsi lorsqu'elles sont stimulées par des médiateurs inflammatoires tels que la lipopolysaccharide. Lesdites cellules peuvent être préparées comme il se doit par culture de cellules souches embryonnaires adhérentes, en présence de GM-CSF.

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