Induction of interleukin-1 in articular cartilage by explantation and cutting.

OBJECTIVE: To investigate the effect of explantation and fine cutting of articular cartilage upon intracellular inflammatory signaling pathways and expression of interleukin-1 (IL-1). METHODS: Cartilage from porcine metacarpophalangeal joints was cultured in serum-free medium. Tissue extracts were...

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मुख्य लेखकों: Gruber, J, Vincent, T, Hermansson, M, Bolton, M, Wait, R, Saklatvala, J
स्वरूप: Journal article
भाषा:English
प्रकाशित: 2004
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author Gruber, J
Vincent, T
Hermansson, M
Bolton, M
Wait, R
Saklatvala, J
author_facet Gruber, J
Vincent, T
Hermansson, M
Bolton, M
Wait, R
Saklatvala, J
author_sort Gruber, J
collection OXFORD
description OBJECTIVE: To investigate the effect of explantation and fine cutting of articular cartilage upon intracellular inflammatory signaling pathways and expression of interleukin-1 (IL-1). METHODS: Cartilage from porcine metacarpophalangeal joints was cultured in serum-free medium. Tissue extracts were examined for ERK activation by phosphorylated-Western blotting, for JNK and p38 MAPK activity by kinase assay, and for IkappaBalpha. IL-1alpha and IL-1beta messenger RNA (mRNA) was measured by reverse transcriptase-polymerase chain reaction. IL-1 activity was measured by the induction of serum amyloid A protein in cultured chondrocytes. RESULTS: All 3 MAPKs (p38, JNK, and ERK) were rapidly activated upon dissection and explantation of the cartilage. IL-1alpha and IL-1beta mRNA was also induced: the speed and magnitude of induction were increased if the explants had been finely cut. IL-1 activity that could be inhibited by IL-1 receptor antagonist or antibodies to IL-1alpha was found in extracts of explants cultured for 20 hours or lysates of cells isolated from them. This activity was likely due to intracellular proIL-1alpha that was not secreted. ProIL-1beta would not be detected because it is biologically inactive. The mechanism of inflammatory signaling pathway activation underlying the induction of IL-1 is unknown. CONCLUSION: Explantation and cutting of articular cartilage activates intracellular inflammatory signaling pathways and induces expression of mRNA for IL-1alpha and IL-1beta. Biologically active IL-1alpha protein was detectable in cartilage lysates and was probably intracellular proIL-1alpha. We were unable to show that IL-1 was secreted by chondrocytes.
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spelling oxford-uuid:4a3f6a6a-4e89-4a05-bdc0-3a96de65a9b02022-03-26T15:36:22ZInduction of interleukin-1 in articular cartilage by explantation and cutting.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4a3f6a6a-4e89-4a05-bdc0-3a96de65a9b0EnglishSymplectic Elements at Oxford2004Gruber, JVincent, THermansson, MBolton, MWait, RSaklatvala, J OBJECTIVE: To investigate the effect of explantation and fine cutting of articular cartilage upon intracellular inflammatory signaling pathways and expression of interleukin-1 (IL-1). METHODS: Cartilage from porcine metacarpophalangeal joints was cultured in serum-free medium. Tissue extracts were examined for ERK activation by phosphorylated-Western blotting, for JNK and p38 MAPK activity by kinase assay, and for IkappaBalpha. IL-1alpha and IL-1beta messenger RNA (mRNA) was measured by reverse transcriptase-polymerase chain reaction. IL-1 activity was measured by the induction of serum amyloid A protein in cultured chondrocytes. RESULTS: All 3 MAPKs (p38, JNK, and ERK) were rapidly activated upon dissection and explantation of the cartilage. IL-1alpha and IL-1beta mRNA was also induced: the speed and magnitude of induction were increased if the explants had been finely cut. IL-1 activity that could be inhibited by IL-1 receptor antagonist or antibodies to IL-1alpha was found in extracts of explants cultured for 20 hours or lysates of cells isolated from them. This activity was likely due to intracellular proIL-1alpha that was not secreted. ProIL-1beta would not be detected because it is biologically inactive. The mechanism of inflammatory signaling pathway activation underlying the induction of IL-1 is unknown. CONCLUSION: Explantation and cutting of articular cartilage activates intracellular inflammatory signaling pathways and induces expression of mRNA for IL-1alpha and IL-1beta. Biologically active IL-1alpha protein was detectable in cartilage lysates and was probably intracellular proIL-1alpha. We were unable to show that IL-1 was secreted by chondrocytes.
spellingShingle Gruber, J
Vincent, T
Hermansson, M
Bolton, M
Wait, R
Saklatvala, J
Induction of interleukin-1 in articular cartilage by explantation and cutting.
title Induction of interleukin-1 in articular cartilage by explantation and cutting.
title_full Induction of interleukin-1 in articular cartilage by explantation and cutting.
title_fullStr Induction of interleukin-1 in articular cartilage by explantation and cutting.
title_full_unstemmed Induction of interleukin-1 in articular cartilage by explantation and cutting.
title_short Induction of interleukin-1 in articular cartilage by explantation and cutting.
title_sort induction of interleukin 1 in articular cartilage by explantation and cutting
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