Cutting edge: Direct interaction of TLR4 with NAD(P)H oxidase 4 isozyme is essential for lipopolysaccharide-induced production of reactive oxygen species and activation of NF-κB

Hye Sun Park, Hye Young Jung, Eun Young Park, Jaesang Kim, Won Jae Lee, Yun Soo Bae

Research output: Contribution to journalArticlepeer-review

511 Scopus citations

Abstract

LPS, the primary constituent of the outer membrane of Gram-negative bacteria, is recognized by TLR4. Binding of TLR4 to LPS triggers various cell signaling pathways including NF-κB activation and reactive oxygen species (ROS) production. In this study, we present the data that LPS-induced ROS generation and NF-κB activation are mediated by a direct interaction of TLR4 with (NAD(P)H oxidase 4 (Nox) 4), a protein related to gp91phox (Nox2) of phagocytic cells, in HEK293T cells. Yeast two hybrid and GST pull-down assays indicated that the COOH-terminal region of Nox4 interacted with the cytoplasmic tail of TLR4. Knockdown of Nox4 by transfection of small interference RNA specific to the Nox4 isozyme in HEK293T cells expressing TLR4 along with MD2 and CD14 resulted in inhibition of LPS-induced ROS generation and NF-κB activation. Taken together, these results indicate that direct interaction of TLR4 with Nox4 is involved in LPS-mediated ROS generation and NF-κB activation.

Original languageEnglish
Pages (from-to)3589-3593
Number of pages5
JournalJournal of Immunology
Volume173
Issue number6
DOIs
StatePublished - 15 Sep 2004

Fingerprint

Dive into the research topics of 'Cutting edge: Direct interaction of TLR4 with NAD(P)H oxidase 4 isozyme is essential for lipopolysaccharide-induced production of reactive oxygen species and activation of NF-κB'. Together they form a unique fingerprint.

Cite this