The invention is directed to novel cell compositions termed AMP-N cells. In particular, the invention is directed to novel AMP-N cell compositions and novel compositions derived from the AMP-N cells including, but not limited to, novel cell-derived conditioned medium, termed ACCS-N. The invention is further directed to novel methods for making the novel AMP-N cell and ACCS-N compositions as well as uses thereof.Cette invention concerne de nouvelles compositions de cellules appelées "cellules AMP-N". En particulier, linvention concerne de nouvelles compositions de cellules AMP-N et de nouvelles compositions dérivées de cellules AMP-N comprenant, entre autres, un nouveau milieu conditionné dérivé desdites cellules, appelé ACCS-N. De nouveaux procédés de préparation desdites nouvelles cellules AMP-N et nouvelles compositions ACCS-N ainsi que leurs utilisations sont en outre décrits.