alexa Cigarette smoke activates human monocytes by an oxidant-AP-1 signaling pathway: implications for steroid resistance.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Walters MJ, PaulClark MJ, McMaster SK, Ito K, Adcock IM,

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Abstract Smoking cigarettes is a major risk factor for the development of cardiovascular and respiratory disease. Moreover, smoking-induced pathophysiology is often resistant to the anti-inflammatory effects of glucocorticoids. The nature of cigarette smoke-induced inflammation is still not defined, although neutrophil recruitment and activation seem to be consistent features. In the current study, we have used a range of approaches to demonstrate that cigarette smoke activates human monocytes and macrophages to release the CXC chemokine CXCL8 [(interleukin-8 (IL-8)]. Furthermore, we show for the first time that cigarette smoke synergizes with proinflammatory cytokines IL-1beta and tumor necrosis factor-alpha, and it is this interaction that confers steroid resistance to smoke-induced CXCL8 release. We go on to show that smoke-induced activation of human cells is an oxidant-mediated phenomenon acting through activator protein-1, but not nuclear factor kappaB, pathway. These observations add significantly to our understanding of smoke as an inflammatory stimulus that has implications for potential the development of treatments of smoking or related disease. This article was published in Mol Pharmacol and referenced in Journal of Addiction Research & Therapy

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