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J Biol Chem. 2011 Mar 25;286(12):10702-11. doi: 10.1074/jbc.M110.185793. Epub 2011 Jan 25.

Raftlin is involved in the nucleocapture complex to induce poly(I:C)-mediated TLR3 activation.

Author information

1
Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo 060-8638, Japan.

Abstract

The double-stranded RNA analog, poly(I:C), extracellularly activates both the endosomal Toll-like receptor (TLR) 3 and the cytoplasmic RNA helicase, melanoma differentiation-associated gene 5, leading to the production of type I interferons (IFNs) and inflammatory cytokines. The mechanism by which extracellular poly(I:C) is delivered to TLR3-positive organelles and the cytoplasm remains to be elucidated. Here, we show that the cytoplasmic lipid raft protein, Raftlin, is essential for poly(I:C) cellular uptake in human myeloid dendritic cells and epithelial cells. When Raftlin was silenced, poly(I:C) failed to enter cells and induction of IFN-β production was inhibited. In addition, cellular uptake of B-type oligodeoxynucleotide that shares its uptake receptor with poly(I:C) was suppressed in Raftlin knockdown cells. Upon poly(I:C) stimulation, Raftlin was translocated from the cytoplasm to the plasma membrane where it colocalized with poly(I:C), and thereafter moved to TLR3-positive endosomes. Thus, Raftlin cooperates with the uptake receptor to mediate cell entry of poly(I:C), which is critical for activation of TLR3.

PMID:
21266579
PMCID:
PMC3060521
DOI:
10.1074/jbc.M110.185793
[Indexed for MEDLINE]
Free PMC Article
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