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Legrand-Poels, S.* ; Kustermans, G.* ; Bex, F.* ; Kremmer, E. ; Kufer, T.A.* ; Piette, J.*

Modulation of Nod2-dependent NF-kB signaling by the actin cytoskeleton.

J. Cell Sci. 120, 1299-1310 (2007)
Open Access Green as soon as Postprint is submitted to ZB.
Actin disruption by CytochalasinD (CytD) and LatrunculinB (LatB) induced NF-kappaB activation in myelomonocytic and intestinal epithelial cells. In an attempt to elucidate the mechanism by which actin disruption induced IKK activation, we studied the human Nod2 protein, which was able to induce NF-kappaB activation and whose expression was restricted to myelomonocytic and intestinal epithelial cells. Nod2 is thought to play key roles in pathogen defence through sensing bacteria and generating an inflammatory immune response. We showed that actin disruption by CytD significantly and specifically increased Nod2-mediated NF-kappaB signaling. Nod2 was fully partitioned in the Triton-X-100-insoluble fraction but translocated into the soluble fraction after CytD treatment, demonstrating that the presence of Nod2 in the detergent-insoluble pellet was specific to actin cytoskeleton. Confocal analysis also revealed a Nod2 colocalization with membrane-associated F-actin. Colocalization and co-immunoprecipitation assays with endogenous Rac1 have shown that Nod2 associated with activated Rac1 in membrane ruffles through both its N-terminal caspase recruitment domains (CARD) and C-terminal leucine-rich repeats (LRRs). Membrane ruffle disruption by a Rac1 dominant negative form primed Nod2-dependent NF-kappaB signaling. The recruitment of Nod2 in Rac-induced dynamic cytoskeletal structures could be a strategy to both repress the Nod2-dependent NF-kappaB signaling in unstimulated cells and rapidly mobilize Nod2 during bacterial infection.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Actin cytoskeleton; NF-{kappa}B; Nod2; Rac1
ISSN (print) / ISBN 0021-9533
e-ISSN 1477-9137
Journal Journal of Cell Science
Quellenangaben Volume: 120, Issue: 7, Pages: 1299-1310 Article Number: , Supplement: ,
Publisher Company of Biologists
Publishing Place Cambridge
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Molecular Immunology (IMI)