Itional fileAdditional file 1: Figure S1. Effect of CSE prepared from filtered and non-filtered cigarettes on CFTR expression. 16HBE14o- cells were incubated with 10 CSE ready from filtered or non-filtered cigarettes. CFTR protein was detected by immunoblotting as described in Techniques section. Blots are representative of 3 independent experiments. Competing interests The authors declare that they have no competing interests. Authors’ contributions FH contributed for the execution from the experiments, qRT-PCR, immunoblotting and immunohistochemistry. XX contributed for the execution in the experimentsHassan et al. Respiratory Research 2014, 15:69 http://respiratory-research/TBK1 Inhibitor web content/15/1/Page 9 of11.12.13.14.15.16.17.18. 19. 20.21.22. 23. 24.25. 26.27.28.29.30.31.transmembrane conductance regulator (CFTR) chloride channels in human airway epithelial cells. J Biol Chem 2012, 287:171307139. Caruso RV, O’Connor RJ, Stephens WE, Cummings KM, Fong GT: Toxic metal concentrations in cigarettes obtained from U.S. smokers in 2009: outcomes from the International Tobacco Control (ITC) United states of america survey cohort. Int J Environ Res Public Overall health 2014, 11:20217. Matsui H, Grubb BR, MEK Inhibitor MedChemExpress Tarran R, Randell SH, Gatzy JT, Davis CW, Boucher RC: Evidence for periciliary liquid layer depletion, not abnormal ion composition, in the pathogenesis of cystic fibrosis airways disease. Cell 1998, 95:1005015. Ghio AJ, Hilborn ED, Stonehuerner JG, Dailey LA, Carter JD, Richards JH, Crissman KM, Foronjy RF, Uyeminami DL, Pinkerton KE: Particulate matter in cigarette smoke alters iron homeostasis to generate a biological impact. Am J Respir Crit Care Med 2008, 178:1130138. Tarran R, Sabater JR, Clarke TC, Tan CD, Davies CM, Liu J, Yeung A, Garland AL, Stutts MJ, Abraham WM, Phillips G, Baker WR, Wright CD, Wilbert S: Nonantibiotic macrolides protect against human neutrophil elastase-induced mucus stasis and airway surface liquid volume depletion. Am J Physiol Lung Cell Mol Physiol 2013, 304:L746 756. Rollins BM, Burn M, Coakley RD, Chambers LA, Hirsh AJ, Clunes MT, Lethem MI, Donaldson SH, Tarran R: A2B adenosine receptors regulate the mucus clearance component in the lung’s innate defense system. Am J Respir Cell Mol Biol 2008, 39:19097. Cormet-Boyaka E, Di A, Chang SY, Naren AP, Tousson A, Nelson DJ, Kirk KL: CFTR chloride channels are regulated by a SNAP-23/syntaxin 1A complex. Proc Natl Acad Sci U S A 2002, 99:124772482. Rennolds J, Malireddy S, Hassan F, Tridandapani S, Parinandi N, Boyaka PN, Cormet-Boyaka E: Curcumin regulates airway epithelial cell cytokine responses towards the pollutant cadmium. Biochem Biophys Res Commun 2012, 417:25661. Killilea AN, Downing KH, Killilea DW: Zinc deficiency reduces paclitaxel efficacy in LNCaP prostate cancer cells. Cancer Lett 2007, 258:709. Boucher RC: Proof for airway surface dehydration because the initiating event in CF airway disease. J Intern Med 2007, 261:56. Stanton CR, Thibodeau R, Lankowski A, Shaw JR, Hamilton JW, Stanton BA: Arsenic inhibits CFTR-mediated chloride secretion by killifish (Fundulus heteroclitus) opercular membrane. Cell Physiol Biochem 2006, 17:26978. Maitra R, Hamilton JW: Arsenite regulates Cystic Fibrosis Transmembrane Conductance Regulator and P-glycoprotein: evidence of pathway independence. Cell Physiol Biochem 2005, 16:10918. Bernhard D, Rossmann A, Wick G: Metals in cigarette smoke. IUBMB Life 2005, 57:80509. Mizumura K, Cloonan SM, Haspel JA, Choi AM: The emerging importance of autophagy in pulmonary dis.