Evaluation of the TLR negative regulatory network in CVID patients

Genes Immun. 2019 Mar;20(3):198-206. doi: 10.1038/s41435-018-0022-3. Epub 2018 Apr 5.

Abstract

Common variable immunodeficiency (CVID), a clinically symptomatic primary immunodeficiency disease (PID), is characterized by hypogammaglobulinemia leading to recurrent infections and various complications. Recently, some defects in the signaling of TLRs have been identified in CVID patients which led us to investigate the expression of TLR4 and 9 negative regulatory molecules and their upregulation status following their activation. Using TaqMan real-time PCR, SOCS1, TNFAIP3, RFN216, and IRAK-M transcripts among peripheral blood mononuclear cells (PBMCs) were measured with/without TLR4 and 9 activations. TLR4 and 9 were activated by lipopolysaccharide (LPS) and unmethylated CpG-oligodeoxynucleotide (CpG-ODN), respectively. Production of IFN-α and TNF-α cytokines, as a part of the functional response of mentioned TLRs, was also measured using ELISA. Deficient transcripts of IRAK-M and TNFAIP3 in unstimulated PBMCs and lower production of TNF-α and IFN-α after treatments were observed. Upregulation of RFN216 and TNFAIP3 after TLR9 activation was abnormal compared to healthy individuals. Significant correlations were found between abnormal IRAK-M and TNFAIP3 transcripts, and lymphadenopathy and inflammatory scenarios in patients, respectively. It seems that the transcriptional status of some negative regulatory molecules is disturbed in CVID patients, and this could be caused by the underlying pathogenesis of CVID and could involve complications like autoimmunity and inflammatory responses.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Cells, Cultured
  • Common Variable Immunodeficiency / genetics*
  • Common Variable Immunodeficiency / immunology
  • Cytokines / genetics
  • Cytokines / metabolism
  • Female
  • Gene Regulatory Networks*
  • Humans
  • Interleukin-1 Receptor-Associated Kinases / genetics
  • Interleukin-1 Receptor-Associated Kinases / metabolism
  • Male
  • Monocytes / metabolism
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Signal Transduction
  • Suppressor of Cytokine Signaling 1 Protein / genetics
  • Suppressor of Cytokine Signaling 1 Protein / metabolism
  • Toll-Like Receptor 4 / genetics*
  • Toll-Like Receptor 4 / metabolism
  • Toll-Like Receptor 9 / genetics*
  • Toll-Like Receptor 9 / metabolism
  • Tumor Necrosis Factor alpha-Induced Protein 3 / genetics
  • Tumor Necrosis Factor alpha-Induced Protein 3 / metabolism

Substances

  • Cytokines
  • RNA, Messenger
  • SOCS1 protein, human
  • Suppressor of Cytokine Signaling 1 Protein
  • TLR4 protein, human
  • TLR9 protein, human
  • Toll-Like Receptor 4
  • Toll-Like Receptor 9
  • IRAK3 protein, human
  • Interleukin-1 Receptor-Associated Kinases
  • TNFAIP3 protein, human
  • Tumor Necrosis Factor alpha-Induced Protein 3