Nod1, a CARD protein,enhances pro-interleukin-1beta processing through the interaction with pro-caspase-1 |
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Authors: | Yoo Nam Jin Park Won Sang Kim Su Young Reed John C Son Seong Gon Lee Jung Young Lee Sug Hyung |
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Affiliation: | Department of Pathology, College of Medicine, The Catholic University of Korea, 505 Banpo-dong, Socho-gu, Seoul 137-701, South Korea. |
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Abstract: | The production of bioactive interleukin-1beta (IL-1beta), a pro-inflammatory cytokine, is mediated by activated caspase-1. One of the known molecular mechanisms underlying pro-caspase-1 processing and activation involves interaction between the caspase recruit domains (CARDs) of caspase-1 and a serine/threonine kinase RIP2. While the association of Nod1 with both caspase-1 and RIP2 is already known, the consequences of these interactions are poorly understood. Because Nod1 also binds to RIP2, we hypothesized that Nod1 plays a role in pro-caspase-1 activation and IL-1beta processing. We show here that Nod1 binds to both RIP2 and caspase-1 by CARD interactions. Nod1 enhances pro-caspase-1 oligomerization and pro-caspase-1 processing. Nod1 enhances caspase-1-induced IL-1beta secretion, as well as lipopolysaccharide (LPS)-induced IL-1beta secretion in transfected cells. Moreover, HT1080 cells stably transfected with Nod1 showed higher LPS-induced IL-1beta secretion than non-transfected cells, suggesting a role of Nod1 in LPS-induced responses. Our data indicate that Nod1 can regulate IL-1beta secretion, implying that Nod1 may play a role in inflammatory responses to bacterial LPS. |
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Keywords: | Caspase-1 Interleukin-1β Nod1 Lipopolysaccharide |
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