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Endocrine, Metabolic & Immune Disorders - Drug Targets

Author(s): Sevgi Irtegun-Kandemir*, Irmak Icen-Taskin, Mehtap Bozkurt and Sevgi Kalkanli-Tas

DOI: 10.2174/1871530319666190119101756

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mRNA Expression Profile of SFKs and Involvement of SFKs in the Regulation of LPS-Induced Erk1/2 Signaling in PBMCs of Active BD Patients

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Abstract

Background: Behcet’s Disease (BD) is a multisystemic inflammatory disorder affecting large vessels, lungs joints, gastrointestinal and neurological systems. The pathogenesis of BD remains poorly understood. Identifying the key signaling pathway is crucial for a complete understanding of the pathogenesis of BD.

Objective: The aim of this study was to determine mRNA expression level of Src family kinases (SFKs) members and their involvement in lipopolysaccharide (LPS)-induced mitogen-activated protein kinases (MAPKs) regulation in peripheral blood mononuclear cells (PBMCs) of active BD patients.

Methods: Twenty- five active BD patients and twenty-five healthy controls were included in the study. PBMCs were isolated from total blood by density gradient centrifugation. The mRNA expression levels of SFKs members were measured by real-time quantitative PCR (RT-qPCR). The effect of SFKs activity on LPS-induced activation MAPKs (Erk1/2, p38 and JNK) was examined by Western blot.

Results: The mRNA expression levels of Hck, Src, Lyn, Yes and Fyn were found to be slightly decreased in active BD patients compared to the control subjects, but a slight change in mRNA level of SFKs members did not impact on protein levels and protein activity. LPS-induced Erk1/2 phosphorylation was significantly increased in the absence of SFKs activity in active BD patients. However, inhibition of SFKs activity had no effect on LPS-induced phosphorylation of p38 and JNK in both controls and active BD patients.

Conclusion: SFKs downregulate LPS-induced Erk1/2 phosphorylation in PBMCs of active BD patients.

Keywords: Behçet's disease, LPS, Mitogen-activated protein kinase, Src family kinases, PBMCs, TLR4.

Graphical Abstract

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