RRC ID 44709
Author Song Y, Ding N, Kanazawa T, Yamashita U, Yoshida Y.
Title Cucurbitacin D is a new inflammasome activator in macrophages.
Journal Int Immunopharmacol
Abstract We previously reported that cucurbitacin D isolated from Trichosanthes kirilowii has anti-tumor roles to leukemia cells. However, the effect of cucurbitacin D on immune cells is not fully understood although there is no toxic activity to normal cells. In this study, immunomodulating activities of cucurbitacin D were investigated in macrophages. Cucurbitacin D could increase LPS-induced interleukin (IL)-1β production in culture supernatant of THP-1 cells, peritoneal exudate cells (PECs), bone marrow derived macrophages (BMDMs), and RAW264 cells. At the transcriptional level, cucurbitacin D enhanced LPS-induced IL-1β mRNA expression through activation of ERK1/2 mitogen-activated protein kinases (MAPKs). At the posttranscriptional level, the activation of caspase-1 induced by cucurbitacin D has also been demonstrated following treatment with a caspase-1 inhibitor and siRNA. Importantly, cucurbitacin D has further been shown to induce inflammasome activation independent of ERK1/2 activation. Western blotting showed interaction of NOD-like receptor family, pyrin domain containing 3 (NALP3) and apoptosis-associated speck-like protein containing a caspase-activating and recruitment domain (ASC), suggesting activation of the inflammasome and a possible reason for activation of caspase-1. Taken together, these results suggest that cucurbitacin D could initiate immunomodulating activity in macrophages to lead to inflammasome activation as well as enhancement of LPS signaling.
Volume 17(4)
Pages 1044-50
Published 2013-12-1
DOI 10.1016/j.intimp.2013.10.003
PII S1567-5769(13)00371-8
PMID 24140411
MeSH Animals Bone Marrow Cells / cytology Cell Line Cells, Cultured Immunologic Factors / pharmacology* Inflammasomes / drug effects Inflammasomes / immunology Interleukin-1beta / genetics Interleukin-1beta / immunology* Lipopolysaccharides Macrophages / drug effects* Macrophages / immunology Mice Mice, Inbred BALB C Mitogen-Activated Protein Kinase 1 / immunology Mitogen-Activated Protein Kinase 3 / immunology Triterpenes / pharmacology*
IF 3.361
Times Cited 9
Human and Animal Cells