CD56bright NK IL-7Rα expression negatively associates with HCV level, and IL-7-induced NK function is impaired during HCV and HIV infections

Chelsey J. Judge, Lenche Kostadinova, Kenneth E. Sherman, Adeel A. Butt, Yngve Falck-Ytter, Nicholas T. Funderburg, Alan L. Landay, Michael M. Lederman, Scott F. Sieg, Johan K. Sandberg, Donald D. Anthony

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Several lines of evidence support the concept that NK cells play an important role in control of hepatitis C virus (HCV) infection via cytokine secretion and cytotoxicity. IL-7 is a homeostatic cytokine with a role in T cell development, activation, proliferation, and cytokine secretion. The IL-7Rα chain [cluster of differentiation (CD)127] is expressed on NK cells, with greatest abundance on the CD56brightCD16dim/- (CD56bright) subset. Here, we measured CD127 expression on CD56bright, CD56dimCD16+ (CD56dim), or CD56negCD16+ (CD56neg) NK cell subsets of 25 uninfected donors (UD); 34 chronic HCV-infected, treatment-naïve; 25 HIV-infected, virally suppressed on antiretroviral therapy (ART); and 42 HCV-HIV-coinfected subjects on ART. Interestingly, CD127 expression on CD56bright NK cells negatively correlated with HCV plasma levels in HCV monoinfection and HCV-HIV coinfection. IL-7 induced CD69 expression, as well as IFN-γ production, in CD56bright NK cells and also enhanced the IFN-α-induced CD69 expression on these cells. The latter was impaired in HIV infection. Furthermore, IL-7 induced B cell lymphoma 2 (BCL-2) expression and cell cycling of CD56bright NK cells, and this effect was impaired in HCV- and HIV-infected subjects.Whereas IL- 7-stimulated CD56bright NK cell degranulation appeared intact in all cohorts, we observed impaired IL-7-activated NK cell cytolytic function in HCV- and HIV-infected subjects. Finally, IL-7-induced phosphorylation of STAT-5 (pSTAT-5) signaling was impaired in NK cells of subjects with chronic viral infection, and this was reversible upon 6 mo of viral suppression with IFN-free HCV therapy. These results implicate that IL-7-dependent NK cell activation and effector function may be other host immune surveillance mechanisms that are impaired in viral infections.

Original languageEnglish (US)
Pages (from-to)171-184
Number of pages14
JournalJournal of Leukocyte Biology
Volume102
Issue number1
DOIs
StatePublished - Jul 2017
Externally publishedYes

Keywords

  • Cellular immunity
  • Host defense
  • IFN-γ
  • Innate immunity
  • Viral immunity

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Cell Biology

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