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|University of Montpellier , France|
|ScientificTracks Abstracts: J Infect Dis Ther|
|The progression of human immunodeficiency virus (HIV) is associated with mucosal damage in the gastrointestinal (GI) tract. This damage enables bacterial translocation from the gut and leads to subsequent inflammation. Dextran sulphate sodium (DSS-treatment) is an established animal model for experimental colitis that was recently shown to recapitulate the link between GI-tract damage and pathogenic features of SIV infection. The current study tested the protective properties of ABX464, a first-inclass anti-HIV drug candidate that has demonstrated anti-viral activity in HIV treatment of naïve patients. ABX464 also induced a long-lasting control of the viral load in HIV infected humanized mice after treatment arrest. ABX464 treatment strongly attenuated DSS-induced colitis in mice and produced a long-term protection against prolonged DSS-exposure after drug cessation. Consistently, ABX464 reduced the colonic production of the inflammatory cytokines IL-6 and TNF as well as that of the chemoattractant MCP- 1. However, RNA profiling analysis revealed the capacity of ABX464 to induce the expression of IL-22, a cytokine involved in colitis tissue repair both in DSS-treated mice. A comprehensive analysis of the gene expression profiles by RNAseq demonstrated that the expression of IL22 was preferentially induced by ABX464 in mouse bone marrow derived macrophages only upon stimulation with LPS. Importantly, anti-IL22 antibodies abrogated the protective effect of ABX464 on colitis in DSS-treated mice. Because reduced IL-22 production in the gut mucosa is an established factor of HIV and DSS-induced immunopathogenesis, our data suggest that the anti-inflammatory properties of ABX464 warrant exploration in both HIV and inflammatory ulcerative colitis (UC) disease. In the DSS induced colitis model, ABX464 protects mice from inflammatory response by prevention of weight loss and colon size, reduced macrophage recruitment into the intestine, decreased levels of pro-inflammatory cytokines and long-lasting effect (like in the HIV humanized mouse model).|
Jamal Tazi is Professor of Functional Genomics at the University of Montpellier and Deputy Director of the Health Centre Biology "Rabelais" responsible for education and training. For 20 years, he led the team "messenger RNA metabolism in metazoans" within the Institute for Molecular Genetics in Montpellier (IGMM) where he made important contributions to understand the fundamental mechanisms of the expression of our genes and editing of their products. These discoveries are used today in the medical field through the development of a new therapy based on the use of small molecules to fight against viral infections. To ensure the transition between basic and applied research, and also to support these innovative projects to clinical stage, Hel founded in 2008 the company Splicos and established its partnership with public institutions as a cooperative laboratory where, he became the Scientific Director.
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