To cite this version:Pinja Ilmarinen, Hannele Hasala, Outi Sareila, Eeva Moilanen, Hannu Kankaanranta. Bacterial DNA delays human eosinophil apoptosis. Pulmonary Pharmacology & Therapeutics, 2009, 22 (3), pp.167. <10.1016/j.pupt.2008.11.012>. Please cite this article as: Ilmarinen P, Hasala H, Sareila O, Moilanen E, Kankaanranta H. Bacterial DNA delays human eosinophil apoptosis, Pulmonary Pharmacology & Therapeutics (2008), doi: 10.1016/j.pupt.2008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ODNs had occasionally parallel but less profound effect on eosinophil apoptosis, which was not dependent on endosomal acidification. The anti-apoptotic effect of CpG
AcceptedODNs was dependent on phosphatidylinositol 3-kinase (PI3K) and nuclear factor-κB (NF-κB) but not mitogen-activated protein kinases (MAPKs) as determined by inhibitor studies. Although our results suggest CpG-dependent involvement of TLR9 in the action of phosphorothioate-modified ODNs, we interestingly found that the antiapoptotic action of native bacterial DNA in eosinophils is not dependent on unmethylated CpG motifs. This suggests that bacterial DNA contains a currently unknown recognition structure lacking from vertebrate DNA. Bacterial DNA-mediated suppression of eosinophil apoptosis is a novel mechanism for exacerbation of eosinophilic lung inflammation associated with bacterial respiratory tract infection.