IFIT Proteins Are Involved in CXCL10 Expression in Human Glomerular Endothelial Cells Treated with a Toll-Like Receptor 3 Agonist

• Main Authors: Tadaatsu Imaizumi, Shun Hashimoto, Riko Sato, Hidenori Umetsu, Tomomi Aizawa, Shojiro Watanabe, Shogo Kawaguchi, Tomoh Matsumiya, Kazuhiko Seya, Jiangli Ding, Hiroshi Tanaka
• Format: Article
• Language: English
• Published: Karger Publishers 2020-12-01
• Series: Kidney & Blood Pressure Research
• Subjects: cxcl10; ifit1; ifit2; ifit3; glomerular endothelial cells
• Online Access: https://www.karger.com/Article/FullText/511915

Introduction: Various viruses including a novel coronavirus (SARS-CoV-2) can infect the kidney. When viruses invade the glomeruli from the bloodstream, glomerular endothelial cells (GECs) initiate the innate immune reactions. We investigated the expression of interferon (IFN)-induced protein with tetratricopeptide repeats (IFIT) 1/2/3, antiviral molecules, in human GECs treated with a toll-like receptor (TLR) 3 agonist. Role of IFIT1/2/3 in the expression of C-X-C motif chemokine ligand 10 (CXCL10) was also examined. Methods: Human GECs were cultured and stimulated with polyinosinic-polycytidylic acid (poly IC), a synthetic TLR3 agonist. Real-time qPCR, Western blotting, and ELISA were used to examine the expression of IFIT1/2/3, IFN-β, and CXCL10. RNA interference against IFN-β or IFIT1/2/3 was also performed. Results: Expression of IFIT1/2/3 and CXCL10 was induced by poly IC in GECs. The inductions were inhibited by RNA interfering of IFN-β. Knockdown of IFIT1/2/3 decreased the CXCL10 expression. Knockdown of IFIT3 decreased the expression of IFIT1 and IFIT2 proteins. Conclusion: IFIT1/2/3 and CXCL10 were induced by poly IC via IFN-β in GECs. IFIT1/2/3 may increase the expression of CXCL10 which induces lymphocyte chemotaxis and may inhibit the replication of infected viruses. These molecules may play a role in GEC innate immune reactions in response to viruses.