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https://hdl.handle.net/2440/7382
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Type: | Journal article |
Title: | Regulation of human neutrophil-mediated cartilage proteoglycan degradation by phosphatidylinositol-3-kinase |
Author: | Hii, C. Marin, L. Halliday, D. Roberton, D. Murray, A. Ferrante, A. |
Citation: | Immunology, 2001; 102(1):59-66 |
Publisher: | Blackwell Publishing Ltd |
Issue Date: | 2001 |
ISSN: | 0019-2805 1365-2567 |
Statement of Responsibility: | C. S. T. Hii, L. A. Marin, D. Halliday, D. M. Roberton, A. W. Murray and A. Ferrante |
Abstract: | The ability of neutrophils to degrade cartilage proteoglycan suggests that the neutrophils that accumulate in the joints of rheumatoid arthritis patients are mediators of tissue damage. The regulatory mechanisms which are relevant to the proteoglycan-degrading activity of neutrophils are poorly understood. Since phosphatidylinositol 3-kinase (PI3-K), protein kinase C (PKC), the extracellular signal-regulated protein kinase (ERK)1/ERK2 and cyclic adenosine monophosphate (cAMP) have been reported to regulate neutrophil respiratory burst and/or degranulation, a role for these signalling molecules in regulating proteoglycan degradation was investigated. Preincubation of human neutrophils with GF109203X (an inhibitor of PKC), PD98059 (an inhibitor of MEK, the upstream regulator of ERK1/ERK2) or with forskolin or dibutyryl cAMP, failed to suppress proteoglycan degradation of opsonized bovine cartilage. In contrast, preincubation of neutrophils with wortmannin or LY294002, specific inhibitors of PI3-K, inhibited proteoglycan degradation. Incubation of neutrophils with cartilage resulted in the activation of PI3-K in neutrophils, consistent with a role for PI3-K in proteoglycan degradation. Activation of PI3-K and proteoglycan degradation was enhanced by tumour necrosis factor-α. Degradation caused by neutrophils from the synovial fluid of rheumatoid arthritis patients was also inhibited by wortmannin. These data demonstrate that the proteoglycan degradative activity of neutrophils required PI3-K but not PKC or the ERK1/ERK2/ERK5 cascades and was insensitive to increases in intracellular cAMP concentrations. |
Keywords: | Cartilage, Articular Synovial Fluid Neutrophils Animals Cattle Humans Proteoglycans Cyclic AMP Enzyme Inhibitors Culture Techniques Cell Adhesion Dose-Response Relationship, Drug Phosphatidylinositol 3-Kinases Arthritis, Juvenile Phosphoinositide-3 Kinase Inhibitors |
Description: | Article first published online: 21 DEC 2001 |
Rights: | © 2001 Blackwell Science Ltd |
DOI: | 10.1046/j.1365-2567.2001.01156.x |
Published version: | http://dx.doi.org/10.1046/j.1365-2567.2001.01156.x |
Appears in Collections: | Aurora harvest Paediatrics publications |
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