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- W1595579629 abstract "The lipid moiety of natural haemozoin (nHZ, malarial pigment) was previously shown to enhance expression and release of human monocyte matrix metalloproteinase‐9 (MMP‐9), and a major role for 15‐( S , R )‐hydroxy‐6,8,11,13‐eicosatetraenoic acid (15‐HETE), a nHZ lipoperoxidation product, was proposed. Here, the underlying mechanisms were investigated, focusing on the involvement of mitogen‐activated protein kinases (MAPKs). Results showed that nHZ promoted either early or late p38 MAPK phosphorylation; however, nHZ did not modify basal phosphorylation/expression ratios of extracellular signal‐regulated kinase‐1/2 and c‐jun N‐terminal kinase‐1/2. 15‐HETE mimicked nHZ effects on p38 MAPK, whereas lipid‐free synthetic (s)HZ and delipidized (d)HZ did not. Consistently, both nHZ and 15‐HETE also promoted phosphorylation of MAPK‐activated protein kinase‐2, a known p38 MAPK substrate; such an effect was abolished by SB203580, a synthetic p38 MAPK inhibitor. SB203580 also abrogated nHZ‐dependent and 15‐HETE‐dependent enhancement of MMP‐9 mRNA and protein (latent and activated forms) levels in cell lysates and supernatants. Collectively, these data suggest that in human monocytes, nHZ and 15‐HETE upregulate MMP‐9 expression and secretion through activation of p38 MAPK pathway. The present work provides new evidence on mechanisms underlying MMP‐9 deregulation in malaria, which might be helpful to design new specific drugs for adjuvant therapy in complicated malaria. Copyright © 2013 John Wiley & Sons, Ltd." @default.
- W1595579629 created "2016-06-24" @default.
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- W1595579629 date "2013-03-07" @default.
- W1595579629 modified "2023-10-16" @default.
- W1595579629 title "Involvement of p38 MAPK in haemozoin-dependent MMP-9 enhancement in human monocytes" @default.
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- W1595579629 doi "https://doi.org/10.1002/cbf.2963" @default.
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