Analysis of Influence of Cigarette Smoke on Signaling Pathways of Innate Immune System in Monocytes of Peripheral Blood

Abstract

 

INTRODUCTION: Tobacco smoking is an important medical problem since it has a significant impact on the development and progression of chronic obstructive pulmonary disease (COPD). The components of tobacco smoke can initiate and support local and systemic inflammation with participation of monocytes and macrophages.

AIM: To study molecular mechanisms associated with the impact of cigarette smoke on signaling pathways of the innate immune system in monocytes of peripheral blood.

MATERIALS AND METHODS: The methods of in silico analysis was used to identify genes associated with the impact of tobacco smoke. On the basis of the data obtained, a cellular model of inflammation was created in vitro using tobacco smoke extract and monocytes of peripheral blood isolated by immunomagnetic separation. An enzyme-linked immunoassay (ELISA) kit was used to measure the concentration of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) in cell supernatants, and of Toll-like receptor 4 (TLR4), ATP-binding cassette A1 (ABCA1) in homogenates of cell membranes of native monocytes and monocytes exposed to 4% tobacco smoke extract. These data were compared with the levels of TNF-α, IL-1β, TLR4 and ABCA1 in monocytes of peripheral blood of patients with COPD with frequent exacerbation phenotype and with obliterating atherosclerosis of lower limb arteries (OALLA). For statistical processing and visualization of the data, MedCalc 20.1.4 and R (version 4.2.2) software was used.

RESULTS: Tobacco smoke influences TLR4, TNF-α signaling pathways and lipid metabolism. Cigarette smoke extract enhanced the expression of proinflammatory cytokines TNF-α and IL-1β in cell supernatants, increased the level of TLR4 and decreased that of ABCA1 in plasmolemma of monocytes of peripheral blood. In patients with COPD with frequent exacerbation phenotype and with OALLA, there were shown increase in the levels of proinflammatory TNF-α and IL-1β cytokines in cell supernatants, increase in the level of TLR4 and reduction of the level of ABCA1 in plasmolemma of monocytes of peripheral blood compared to native monocytes of healthy individuals.

CONCLUSION: Cigarette smoke enhances the production of proinflammatory TNF-α and IL-1β cytokines, increases the levels of TLR4 protein and reduces the amount of ABCA1 transporter in membranes of monocytes of peripheral blood. This may partially explain the cause of the influence of cigarette smoke on development of the pulmonary and cardiovascular diseases. COPD with frequent exacerbation phenotype and OALLA are characterized by enhancement of inflammation with participation of monocytes.

Keywords

smoking / chronic obstructive pulmonary disease / inflammation / monocytes / innate immune system

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