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Human bronchial fibroblasts express the 5-lipoxygenase pathway.

Human bronchial fibroblasts express the 5-lipoxygenase pathway.
Human bronchial fibroblasts express the 5-lipoxygenase pathway.
BACKGROUND: Fibroblasts are implicated in sub-epithelial fibrosis in remodeled asthmatic airways and contribute to airway inflammation by releasing cytokines and other mediators. Fibroblast activity is influenced by members of the leukotriene family of bronchoconstrictor and inflammatory mediators, but it is not known whether human bronchial fibroblasts can synthesize leukotrienes.
METHODS: The expression of leukotriene biosynthetic enzymes and receptors was investigated in primary fibroblasts from the bronchi of normal and asthmatic adult subjects using RT-PCR, Western blotting, immunocytochemistry and flow cytometry.
RESULTS: These techniques revealed that human bronchial fibroblasts from both subject groups constitutively express 5-lipoxygenase, its activating protein FLAP, the terminal enzymes leukotriene A4 hydrolase and leukotriene C4 synthase, and receptors for leukotriene B4 (BLT1) and cysteinyl-leukotrienes (CysLT1). Human bronchial fibroblasts generated immunoreactive leukotriene B4 and cysteinyl-leukotrienes spontaneously and in increased amounts after calcium-dependent activation. Flow cytometry showed that human bronchial fibroblasts transformed to a myofibroblast-like phenotype by culture with transforming growth factor-beta1 expressed 320-400% more immunofluorescence for leukotriene C4 synthase and CysLT1 receptors, with 60-80% reductions in leukotriene A4 hydrolase and BLT1 receptors.
CONCLUSION: These results indicate that human bronchial fibroblasts may not only respond to exogenous leukotrienes but also generate leukotrienes implicated in narrowing, inflammation and remodeling of the asthmatic airway.
1465-9921
102-113
James, A.J.
f2040b75-5c66-49ba-a2e5-bc211cfdfcda
Penrose, J.F.
3a1b8c7d-7ea8-4736-80e2-8199e269728e
Cazaly, A.M.
e9ab0071-5992-481d-b542-9a60b3cfb63d
Holgate, S.T.
2e7c17a9-6796-436e-8772-1fe6d2ac5edc
Sampson, A.P.
4ca76f6f-ff35-425d-a7e7-c2bd2ea2df60
James, A.J.
f2040b75-5c66-49ba-a2e5-bc211cfdfcda
Penrose, J.F.
3a1b8c7d-7ea8-4736-80e2-8199e269728e
Cazaly, A.M.
e9ab0071-5992-481d-b542-9a60b3cfb63d
Holgate, S.T.
2e7c17a9-6796-436e-8772-1fe6d2ac5edc
Sampson, A.P.
4ca76f6f-ff35-425d-a7e7-c2bd2ea2df60

James, A.J., Penrose, J.F., Cazaly, A.M., Holgate, S.T. and Sampson, A.P. (2006) Human bronchial fibroblasts express the 5-lipoxygenase pathway. Respiratory Research, 7 (1), 102-113. (doi:10.1186/1465-9921-7-102).

Record type: Article

Abstract

BACKGROUND: Fibroblasts are implicated in sub-epithelial fibrosis in remodeled asthmatic airways and contribute to airway inflammation by releasing cytokines and other mediators. Fibroblast activity is influenced by members of the leukotriene family of bronchoconstrictor and inflammatory mediators, but it is not known whether human bronchial fibroblasts can synthesize leukotrienes.
METHODS: The expression of leukotriene biosynthetic enzymes and receptors was investigated in primary fibroblasts from the bronchi of normal and asthmatic adult subjects using RT-PCR, Western blotting, immunocytochemistry and flow cytometry.
RESULTS: These techniques revealed that human bronchial fibroblasts from both subject groups constitutively express 5-lipoxygenase, its activating protein FLAP, the terminal enzymes leukotriene A4 hydrolase and leukotriene C4 synthase, and receptors for leukotriene B4 (BLT1) and cysteinyl-leukotrienes (CysLT1). Human bronchial fibroblasts generated immunoreactive leukotriene B4 and cysteinyl-leukotrienes spontaneously and in increased amounts after calcium-dependent activation. Flow cytometry showed that human bronchial fibroblasts transformed to a myofibroblast-like phenotype by culture with transforming growth factor-beta1 expressed 320-400% more immunofluorescence for leukotriene C4 synthase and CysLT1 receptors, with 60-80% reductions in leukotriene A4 hydrolase and BLT1 receptors.
CONCLUSION: These results indicate that human bronchial fibroblasts may not only respond to exogenous leukotrienes but also generate leukotrienes implicated in narrowing, inflammation and remodeling of the asthmatic airway.

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Published date: 27 July 2006

Identifiers

Local EPrints ID: 59340
URI: http://eprints.soton.ac.uk/id/eprint/59340
ISSN: 1465-9921
PURE UUID: bf27b1f9-433c-4eb9-85c2-04a9a0c636b1
ORCID for A.P. Sampson: ORCID iD orcid.org/0009-0008-9653-8935

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Date deposited: 02 Sep 2008
Last modified: 16 Mar 2024 02:51

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Contributors

Author: A.J. James
Author: J.F. Penrose
Author: A.M. Cazaly
Author: S.T. Holgate
Author: A.P. Sampson ORCID iD

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