Kidney & Blood Pressure Research (Dec 2020)

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

  • Tadaatsu Imaizumi,
  • Shun Hashimoto,
  • Riko Sato,
  • Hidenori Umetsu,
  • Tomomi Aizawa,
  • Shojiro Watanabe,
  • Shogo Kawaguchi,
  • Tomoh Matsumiya,
  • Kazuhiko Seya,
  • Jiangli Ding,
  • Hiroshi Tanaka

DOI
https://doi.org/10.1159/000511915

Abstract

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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.

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