The TLR-independent DNA recognition pathway in murine macrophages: Ligand features and molecular signature.

Abstract:

:Recognition of foreign DNA by cytosolic innate immune receptors triggers the production of IFN-beta. However, it is unclear whether different types of DNA ligands are recognized by similar receptors and whether the resulting response is distinct from the endosomal TLR response. To address these questions, we compared the two most commonly used types of DNA ligands (IFN-stimulatory DNA (ISD) and poly(dAdT)) and assessed the minimal structural requirements for stimulatory capacity in RAW264.7 cells. Gene expression signatures and competition experiments suggest that ISD and poly(dAdT) are qualitatively indistinguishable and differ from the CpG-containing oligonucleotides triggering the TLR9 pathway. Structure - activity relationship analyses revealed that a minimal length of two helical turns is sufficient for ISD-mediated IFN-beta induction, while phosphorylation at the 5'-end is dispensable. Altogether, our data suggest that, in murine macrophages, only one major cytosolic DNA recognition pathway is operational.

journal_name

Eur J Immunol

authors

Karayel E,Bürckstümmer T,Bilban M,Dürnberger G,Weitzer S,Martinez J,Superti-Furga G

doi

10.1002/eji.200939344

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

1929-36

issue

7

eissn

0014-2980

issn

1521-4141

journal_volume

39

pub_type

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