Papillomavirus-specific CD4+ T cells exhibit reduced STAT-5 signaling and altered cytokine profiles in patients with recurrent respiratory papillomatosis

J Immunol. 2011 Jun 1;186(11):6633-40. doi: 10.4049/jimmunol.1004181. Epub 2011 Apr 29.

Abstract

Recurrent respiratory papillomatosis (RRP) is caused by human papillomavirus type 6 (HPV-6) or HPV-11. Specific HLA-DR haplotypes DRB1*01:02 and DRB1*03:01 are associated with the development of RRP, disease severity, and Th2-like responses to HPV early proteins. Th1-like responses to HPV proteins have been shown to be protective in animal models. Therefore, we investigated the hypothesis that RRP patients have dysfunctional Th1-like, HPV-specific T cell responses. Using MHC class II tetramers, we identified immunogenic peptides within HPV-11 early proteins. Two distinct peptides (E6(113-132) and E2(1-20)) contained DRB1*01:02- or DRB1*03:01-restricted epitopes, respectively. An additional peptide (E2(281-300)) contained an epitope presented by both alleles. Peptide binding, tetramer, and proliferation assays identified minimal epitopes within these peptides. These epitopes elicited E2/E6-specific CD4(+) T cell responses in RRP patients and healthy control subjects, allowing the isolation of HPV-specific T cell lines using tetramers. The cytokine profiles and STAT signaling of these tetramer-positive T cells were measured to compare the polarization and responsiveness of HPV-specific T cells from patients with RRP and healthy subjects. HPV-specific IFN-γ secretion was substantially lower in T cells from RRP patients. HPV-specific IL-13 secretion was seen at modest levels in T cells from RRP patients and was absent in T cells from healthy control subjects. HPV-specific T cells from RRP patients exhibited reduced STAT-5 phosphorylation and reduced IL-2 secretion, suggesting anergy. Levels of STAT-5 phosphorylation and IFN-γ secretion could be improved through addition of IL-2 to HPV-specific T cell lines from RRP patients. Therapeutic vaccination or interventions aimed at restoring Th1-like cytokine responses to HPV proteins and reversing anergy could improve clinical outcomes for RRP patients.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Amino Acid Sequence
  • CD4-Positive T-Lymphocytes / drug effects
  • CD4-Positive T-Lymphocytes / immunology*
  • CD4-Positive T-Lymphocytes / metabolism
  • Cell Line
  • Cells, Cultured
  • Cytokines / immunology*
  • Cytokines / metabolism
  • Epitopes, T-Lymphocyte / immunology
  • Flow Cytometry
  • HLA-DR Antigens / immunology
  • HLA-DR alpha-Chains
  • HLA-DRB1 Chains
  • Host-Pathogen Interactions / immunology
  • Human papillomavirus 11 / immunology*
  • Human papillomavirus 11 / physiology
  • Interferon-gamma / immunology
  • Interferon-gamma / metabolism
  • Interleukin-13 / immunology
  • Interleukin-13 / metabolism
  • Interleukin-2 / immunology
  • Interleukin-2 / metabolism
  • Interleukin-2 / pharmacology
  • Molecular Sequence Data
  • Oncogene Proteins, Viral / chemistry
  • Oncogene Proteins, Viral / immunology
  • Papillomavirus Infections / immunology
  • Papillomavirus Infections / metabolism
  • Papillomavirus Infections / virology
  • Peptides / immunology
  • Phosphorylation / immunology
  • Respiratory Tract Infections / immunology
  • Respiratory Tract Infections / metabolism
  • Respiratory Tract Infections / virology
  • STAT5 Transcription Factor / immunology*
  • STAT5 Transcription Factor / metabolism
  • Signal Transduction / drug effects
  • Signal Transduction / immunology
  • Tumor Necrosis Factor-alpha / immunology
  • Tumor Necrosis Factor-alpha / metabolism
  • Viral Proteins / chemistry
  • Viral Proteins / immunology

Substances

  • Cytokines
  • E2 protein, Human papillomavirus type 11
  • E6 protein, Human papillomavirus type 11
  • Epitopes, T-Lymphocyte
  • HLA-DR Antigens
  • HLA-DR alpha-Chains
  • HLA-DRB1 Chains
  • HLA-DRB1*03:01 antigen
  • Interleukin-13
  • Interleukin-2
  • Oncogene Proteins, Viral
  • Peptides
  • STAT5 Transcription Factor
  • Tumor Necrosis Factor-alpha
  • Viral Proteins
  • Interferon-gamma

Supplementary concepts

  • Recurrent respiratory papillomatosis