Julien Saint-Pol joined the Jean Perrin Faculty of Sciences in Lens in 2006 in the general biology and earth and universe sciences (BGSTU) course. Having obtained his license in 2008, he reoriented himself towards the research sector and obtained his master's degree in biology-health research at the University of Lille II in 2010. His thesis research carried out within the LBHE focused on the impact of oxysterols, natural endogenous agonists of nuclear receptors in liver. In 2014, he carried out his post-doctoral fellowship within the INSERM U935 team (ex. U1004), led by Eric Rubinstein in Villejuif, on an in vitro and in vivo project concerning the study of the regulation of the metalloprotease ADAM10 (A disintegrin and metalloprotease 10) by a subgroup of tetraspanins, TspanC8, and more particularly Tspan5. Then, he became a lecturer at the University of Artois in 2017 and joined the LBHE again with a project focused on cell–cell communications at the BBB level by exosomes, and their impact(s) on the BBB phenotype and pathophysiological condition.