AUTHOR=Zoccal Karina F. , Gardinassi Luiz G. , Sorgi Carlos A. , Meirelles Alyne F. G. , Bordon Karla C. F. , Glezer Isaias , Cupo Palmira , Matsuno Alessandra K. , Bollela Valdes R. , Arantes Eliane C. , Guimarães Francisco S. , Faccioli Lúcia Helena 

TITLE=CD36 Shunts Eicosanoid Metabolism to Repress CD14 Licensed Interleukin-1β Release and Inflammation

JOURNAL=Frontiers in Immunology

VOLUME=9

YEAR=2018

URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2018.00890

DOI=10.3389/fimmu.2018.00890

ISSN=1664-3224

ABSTRACT=<p>Interleukin (IL)-1β is a potential target for treatment of several inflammatory diseases, including envenomation by the scorpion <italic>Tityus serrulatus</italic>. In this context, bioactive lipids such as prostaglandin (PG)E<sub>2</sub> and leukotriene (LT)B<sub>4</sub> modulate the production of IL-1β by innate immune cells. Pattern recognition receptors (PRRs) that perceive <italic>T. serrulatus</italic> venom (TsV), and orchestrate LTB<sub>4</sub>, PGE<sub>2</sub>, and cyclic adenosine monophosphate (cAMP) production to regulate IL-1β release are unknown. Furthermore, molecular mechanisms driving human cell responses to TsV remain uncharacterized. Here, we identified that both CD14 and CD36 control the synthesis of bioactive lipids, inflammatory cytokines, and mortality mediated by TsV. CD14 induces PGE<sub>2</sub>/cAMP/IL-1β release and inflammation. By contrast, CD36 shunts eicosanoid metabolism toward production of LTB<sub>4</sub>, which represses the PGE<sub>2</sub>/cAMP/IL-1β axis and mortality. Of importance, the molecular mechanisms observed in mice strongly correlate with those of human cell responses to TsV. Overall, this study provides major insights into molecular mechanisms connecting CD14 and CD36 with differential eicosanoid metabolism and inflammation mediated by IL-1β.</p>