Induction of dissociated cytokine profiles by ISRAA with selective critical involvement of ERK1/2 in its signaling functions

Elhannan,Sahar; Taha,Safa; Ben Khalaf,Noureddine; Bakheit,Halla; Fathallah,M.   Dahmani; Bakhiet,Moiz

doi:10.3892/ijmm.2015.2376

Induction of dissociated cytokine profiles by ISRAA with selective critical involvement of ERK1/2 in its signaling functions

Authors:
- Sahar Elhannan
- Safa Taha
- Noureddine Ben Khalaf
- Halla Bakheit
- M. Dahmani Fathallah
- Moiz Bakhiet
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Affiliations: Department of Molecular Medicine, Princess Al‑Jawhara Center for Genetics and Inherited Diseases, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain, Biotechnology Program, College of Graduate Studies, Arabian Gulf University, Manama, Bahrain
Published online on: October 15, 2015 https://doi.org/10.3892/ijmm.2015.2376
Pages: 1583-1592

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Abstract

The immune system-released activating agent (ISRAA) is an immune mediator activated as a result of a nerve stimulus initiated by immune challenge. We have previously demonstrated that ISRAA and tumor necrosis factor (TNF) receptor 1 (TNFR1) share an interspecies‑conserved motif (72% homology) that induces the apoptosis and proliferation of human peripheral blood mononuclear cells (hPBMCs) in a dose‑dependent manner. In the present study, cytokine profiles were examined in response to the stimulation of hPBMCs with ISRAA. Furthermore, the signaling pathways induced by ISRAA were mapped. The results revealed high measurable levels of TNF‑α, interleukin (IL)‑6, IL‑8, IL‑10 and interferon (IFN)‑γ, but not IL‑4, IL‑17 (IL-17A) or transforming growth factor (TGF)‑β. The analysis of signaling pathways revealed the activation of extracellular‑regulated protein kinase (ERK)1/2 as a downstream signal in the mitogen‑activated protein kinase (MAPK) pathway during TNF‑α and IL‑6 production and apoptosis, but not during proliferation following stimulation with ISRAA by triggering the Fas-associated protein with death domain (FADD). STAT3 was found to be unphosphorylated in the ISRAA‑stimulated hPBMCs, and STAT3 was ubiquitously expressed in unstimulated cells, suggesting that ISRAA has a protein inhibitor of activated STAT (PIAS)‑like activity, by functioning as a negative regulator of the effects of STAT3 on the Janus kinase (JAK)/STAT pathway. The determination of the nature of cytokine responses together with the signaling pathways of cellular activity induced by ISRAA paves the way for the investigation of a potential target of ISRAA and for the development of novel therapeutic approaches for the treatment of immune-regulated disorders.

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