Abstract:
:Reactive oxygen species (ROS) induce chemokines responsible for the recruitment of inflammatory cells to sites of injury or infection. Here we show that the plasma membrane Ca(2+)-permeable channel TRPM2 controls ROS-induced chemokine production in monocytes. In human U937 monocytes, hydrogen peroxide (H(2)O(2)) evokes Ca(2+) influx through TRPM2 to activate Ca(2+)-dependent tyrosine kinase Pyk2 and amplify Erk signaling via Ras GTPase. This elicits nuclear translocation of nuclear factor-kappaB essential for the production of the chemokine interleukin-8 (CXCL8). In monocytes from Trpm2-deficient mice, H(2)O(2)-induced Ca(2+) influx and production of the macrophage inflammatory protein-2 (CXCL2), the mouse CXCL8 functional homolog, were impaired. In the dextran sulfate sodium-induced colitis inflammation model, CXCL2 expression, neutrophil infiltration and ulceration were attenuated by Trpm2 disruption. Thus, TRPM2 Ca(2+) influx controls the ROS-induced signaling cascade responsible for chemokine production, which aggravates inflammation. We propose functional inhibition of TRPM2 channels as a new therapeutic strategy for treating inflammatory diseases.
journal_name
Nat Medjournal_title
Nature medicineauthors
Yamamoto S,Shimizu S,Kiyonaka S,Takahashi N,Wajima T,Hara Y,Negoro T,Hiroi T,Kiuchi Y,Okada T,Kaneko S,Lange I,Fleig A,Penner R,Nishi M,Takeshima H,Mori Ydoi
10.1038/nm1758subject
Has Abstractpub_date
2008-07-01 00:00:00pages
738-47issue
7eissn
1078-8956issn
1546-170Xpii
nm1758journal_volume
14pub_type
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