The NLRP3 inflammasome is upregulated in HIV-infected antiretroviral therapy-treated individuals with defective immune recovery

Alessandra Bandera, Michela Masetti, Massimiliano Fabbiani, Mara Biasin, Antonio Muscatello, Nicola Squillace, Mario Clerici, Andrea Gori, Daria Trabattoni

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Abstract

Background: Inflammasome-mediated activation of caspase-1 regulates inflammatory responses and pyroptosis. We analyzed possible associations between inflammasome-related genes and immune reconstitution in HIV-infected antiretroviral therapy (ART)-treated patients. Methods: Cross-sectional, case-control study. HIV-infected patients on ART for ≥24 months with HIV-RNA < 50 cp/mL for =12 months were enrolled and defined as immunological responders (IR) or non-responders (INR) if CD4 count was ≥500 or ≤350 cells/μL, respectively. Expression of inflammasome genes, caspases 1, 3, 4, 5 and γ-interferon-inducible protein 16 (IFI16) was measured in unstimulated and LPS- or aldrithiol-2-treated HIV-1BaL virions-stimulated peripheral blood mononuclear cells. Microbial translocation markers were evaluated. Results: Thirty-nine patients (22 IRs; 17 INRs) were enrolled. LPS-stimulated inflammasome genes were significantly upregulated in INRs. Whereas HIV-1BaL stimulation induced (NOD)-like receptor (NLR) family pyrin domain containing 3 (NLRP3) expression in both IRs and INRs, NLRP3 and IL-18 expression was significantly increased in INRs compared to IRs. Significant higher caspase-1 expression was seen as well, whereas caspase 3, 4, and 5 expression was similar in both groups. No differences in microbial translocation markers (LPS and soluble CD14) were detected in the two groups. Conclusion: Upregulation of NLRP3 and caspase-1 is observed in INR patients. This could play a role in persistent immune activation that characterize INRs. Caspase-1 upregulation could induce CD4 T-cell loss via pyroptosis, contributing to unsatisfactory CD4 T-cells recovery.

Original languageEnglish
Article number214
JournalFrontiers in Immunology
Volume9
Issue numberFEB
DOIs
Publication statusPublished - Feb 12 2018

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Keywords

  • Caspase
  • HIV
  • Immune reconstitution
  • Inflammasome
  • Pyroptosis

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

Cite this

Bandera, A., Masetti, M., Fabbiani, M., Biasin, M., Muscatello, A., Squillace, N., Clerici, M., Gori, A., & Trabattoni, D. (2018). The NLRP3 inflammasome is upregulated in HIV-infected antiretroviral therapy-treated individuals with defective immune recovery. Frontiers in Immunology, 9(FEB), [214]. https://doi.org/10.3389/fimmu.2018.00214