IL-17 family cytokines such as IL-17 and IL-25 have been implicated in the pathogenesis of inflammatory and auto-immune diseases. In order to devise strategies to disable signaling by these cytokines in disease, it is imperative to understand the pathways and molecular mechanisms by which these cytokines transmit signals in target cells to effect gene expression. In FY 2009 we have been able to directly demonstrate that IL-17 signaling requires the CIKS adaptor protein to activate NF-kappaB and other specific downstream targets;some of these findings have also been reported by others. In FY 2009 we have also been able to show that IL-25 signals via the CIKS adaptor as well, even though IL-25 and IL-17 are part very different adaptive immune responses. IL-25 contributes to T helper 2 cell (Th2) directed responses, while IL-17 is central to Th17 responses;these two responses may even oppose each other. Specifically we have been able to demonstrate that the CIKS adaptor is transiently recruited to the IL-17RB chain upon stimulation of cells with IL-25;these experiments were carried out with cells transfected with expression constructs encoding molecularly tagged IL-17RB and CIKS. Finally we have been able to demonstrate that IL-25 can directly induce Th2-type cytokines in populations of bone marrow derived dendritic cells and macrophages and that it does so in a CIKS-dependent manner;identification of IL-25 responsive cells is critical as the direct targets of IL-25 have not been clearly defined in the past.

Project Start
Project End
Budget Start
Budget End
Support Year
1
Fiscal Year
2009
Total Cost
$696,457
Indirect Cost
City
State
Country
Zip Code
Valente, Anthony J; Sakamuri, Siva S V P; Siddesha, Jalahalli M et al. (2013) TRAF3IP2 mediates interleukin-18-induced cardiac fibroblast migration and differentiation. Cell Signal 25:2176-84
Venkatesan, Balachandar; Valente, Anthony J; Das, Nitin A et al. (2013) CIKS (Act1 or TRAF3IP2) mediates high glucose-induced endothelial dysfunction. Cell Signal 25:359-71
Valente, Anthony J; Yoshida, Tadashi; Clark, Robert A et al. (2013) Advanced oxidation protein products induce cardiomyocyte death via Nox2/Rac1/superoxide-dependent TRAF3IP2/JNK signaling. Free Radic Biol Med 60:125-35
Valente, Anthony J; Yoshida, Tadashi; Izadpanah, Reza et al. (2013) Interleukin-18 enhances IL-18R/Nox1 binding, and mediates TRAF3IP2-dependent smooth muscle cell migration. Inhibition by simvastatin. Cell Signal 25:1447-56
Valente, Anthony J; Clark, Robert A; Siddesha, Jalahalli M et al. (2012) CIKS (Act1 or TRAF3IP2) mediates Angiotensin-II-induced Interleukin-18 expression, and Nox2-dependent cardiomyocyte hypertrophy. J Mol Cell Cardiol 53:113-24
Pisitkun, Prapaporn; Ha, Hye-Lin; Wang, Hongshan et al. (2012) Interleukin-17 cytokines are critical in development of fatal lupus glomerulonephritis. Immunity 37:1104-15
Sønder, Søren Ulrik; Paun, Andrea; Ha, Hye-Lin et al. (2012) CIKS/Act1-mediated signaling by IL-17 cytokines in context: implications for how a CIKS gene variant may predispose to psoriasis. J Immunol 188:5906-14
Sonder, Soren Ulrik; Saret, Sun; Tang, Wanhu et al. (2011) IL-17-induced NF-kappaB activation via CIKS/Act1: physiologic significance and signaling mechanisms. J Biol Chem 286:12881-90
Pisitkun, Prapaporn; Claudio, Estefania; Ren, Nina et al. (2010) The adaptor protein CIKS/Act1 is necessary to induce collagen-induced arthritis pathology and it contributes to collagen-specific antibody production. Arthritis Rheum :
Claudio, Estefania; Sønder, Søren Ulrik; Saret, Sun et al. (2009) The adaptor protein CIKS/Act1 is essential for IL-25-mediated allergic airway inflammation. J Immunol 182:1617-30