• Molecular pharmacology · Jan 2013

    Identification and characterization of poly(I:C)-induced molecular responses attenuated by nicotine in mouse macrophages.

    • Wen-Yan Cui, Shufang Zhao, Renata Polanowska-Grabowska, Ju Wang, Jinxue Wei, Bhagirathi Dash, Sulie L Chang, Jeffrey J Saucerman, Jun Gu, and Ming D Li.
    • Department of Psychiatry and Neurobehavioral Sciences University of Virginia 1670 Discovery Drive, Suite 110, Charlottesville, VA 22911, USA.
    • Mol. Pharmacol. 2013 Jan 1; 83 (1): 61-72.

    AbstractTo further our understanding of the effects of nicotine on the molecular responses of macrophages during virus or virus-like infections, poly(I:C)-stimulated macrophage-like RAW264.2 cells or mouse primary peritoneal macrophages were challenged with nicotine; and their molecular responses were evaluated using a qRT-PCR array, antibody array, ELISA, Western blotting, and Ca(2+) imaging. Of 51 genes expressed in the Toll-like receptor (TLR) and RIG-I-like receptor (RLR) pathways, mRNA expression of 15 genes in RAW264.7 cells was attenuated by nicotine, of which mRNA expression of IL-6, TNF-α, and IL-1β was confirmed to be attenuated in peritoneal macrophages. Concurrently, nicotine treatment attenuated the release of IL-6 and TNF-α from poly(I:C)-stimulated macrophages. However, when poly(I:C)-stimulated macrophages were challenged with nicotine plus α-bungarotoxin (α-BTX), secretion of IL-6 and TNF-α was found to be in a level seen with poly(I:C) stimulation only, indicating that α7-nAChR, a highly Ca(2+) permeable ion channel sensitive to blockade by α-BTX, is involved in this process. Furthermore, results from an antibody array indicated that nicotine treatment attenuated the phosphorylation of 82 sites, including Thr286 on CaMKIIα, from poly(I:C)-stimulated RAW264.7 cells, of which 28 are expressed in the downstream cascade of Ca(2+) signaling. Coincidentally, poly(I:C)-stimulated macrophages showed attenuated expression of phosphorylated CaMKIIα when pretreated with nicotine. In addition, nicotine attenuated intracellular Ca(2+) signal from poly(I:C)-stimulated RAW264.7 cells. Collectively, these results indicate that poly(I:C)-induced molecular responses of macrophages could be significantly attenuated by nicotine.

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