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Epithelial expression and release of FGF-2 from heparan sulphate binding sites in bronchial tissue in asthma

Epithelial expression and release of FGF-2 from heparan sulphate binding sites in bronchial tissue in asthma
Epithelial expression and release of FGF-2 from heparan sulphate binding sites in bronchial tissue in asthma
Background: The most characteristic structural change evident in endobronchial biopsies in asthma, even in mild disease, is subepithelial collagen deposition within the lamina reticularis. This has been associated with progressive loss of lung function and the persistence of airway hyperresponsiveness, and has been linked to airway fibroblast proliferation. A potent fibroproliferative factor in bronchoalveolar lavage fluid in asthma is fibroblast growth factor-2 (FGF-2). FGF-2 is a member of a family of heparin binding growth factors that bind to heparan sulphate proteoglycans (HSPG), an important determinant of FGF-2 activity. This study compared the level of expression and distribution of FGF-2 in relation to HSPG in bronchial tissue from normal and asthmatic subjects.
Methods: The distribution of FGF-2 and HSPG in intact and cleaved forms in endobronchial biopsies from normal and asthmatic subjects was examined using an immunohistochemical approach. A novel ELISA based method was developed to detect solubilisation of FGF-2 following addition of heparin and heparitinase to bronchial tissue slices.
Results: Immunohistochemical analysis showed that FGF-2 was co-localised to HSPG in epithelial and endothelial basement membranes. Epithelial FGF-2, but not HSPG, was significantly more abundant in patients with mild asthma than in normal subjects. In vitro experiments indicated that FGF-2 was released from binding sites in the tissue by heparin and heparitinase I.
Conclusions: FGF-2 is bound by HSPG in bronchial tissue. The mast cell, through the release of heparin and endoglycosidase, may make a unique contribution to tissue remodelling in allergic asthma.
fibroblast growth factor (fgf)-2, heparin, asthma
0040-6376
557-562
Shute, J.K.
21aa47b2-7a14-4706-981d-f6cc6be58bf4
Solic, N.
5bfe40b6-894a-4a16-b917-c5ac20a019af
Shimizu, J.
5232b69a-a772-4482-936a-aabdd9544796
McConnell, W.
751ac7e8-4904-4d8e-ba44-6430c0e2ff86
Redington, A.E.
ecaab7c4-c44f-4f52-899a-18993a796c2e
Howarth, P.H.
ff19c8c4-86b0-4a88-8f76-b3d87f142a21
Shute, J.K.
21aa47b2-7a14-4706-981d-f6cc6be58bf4
Solic, N.
5bfe40b6-894a-4a16-b917-c5ac20a019af
Shimizu, J.
5232b69a-a772-4482-936a-aabdd9544796
McConnell, W.
751ac7e8-4904-4d8e-ba44-6430c0e2ff86
Redington, A.E.
ecaab7c4-c44f-4f52-899a-18993a796c2e
Howarth, P.H.
ff19c8c4-86b0-4a88-8f76-b3d87f142a21

Shute, J.K., Solic, N., Shimizu, J., McConnell, W., Redington, A.E. and Howarth, P.H. (2004) Epithelial expression and release of FGF-2 from heparan sulphate binding sites in bronchial tissue in asthma. Thorax, 59 (7), 557-562. (doi:10.1136/thx.2002.002626).

Record type: Article

Abstract

Background: The most characteristic structural change evident in endobronchial biopsies in asthma, even in mild disease, is subepithelial collagen deposition within the lamina reticularis. This has been associated with progressive loss of lung function and the persistence of airway hyperresponsiveness, and has been linked to airway fibroblast proliferation. A potent fibroproliferative factor in bronchoalveolar lavage fluid in asthma is fibroblast growth factor-2 (FGF-2). FGF-2 is a member of a family of heparin binding growth factors that bind to heparan sulphate proteoglycans (HSPG), an important determinant of FGF-2 activity. This study compared the level of expression and distribution of FGF-2 in relation to HSPG in bronchial tissue from normal and asthmatic subjects.
Methods: The distribution of FGF-2 and HSPG in intact and cleaved forms in endobronchial biopsies from normal and asthmatic subjects was examined using an immunohistochemical approach. A novel ELISA based method was developed to detect solubilisation of FGF-2 following addition of heparin and heparitinase to bronchial tissue slices.
Results: Immunohistochemical analysis showed that FGF-2 was co-localised to HSPG in epithelial and endothelial basement membranes. Epithelial FGF-2, but not HSPG, was significantly more abundant in patients with mild asthma than in normal subjects. In vitro experiments indicated that FGF-2 was released from binding sites in the tissue by heparin and heparitinase I.
Conclusions: FGF-2 is bound by HSPG in bronchial tissue. The mast cell, through the release of heparin and endoglycosidase, may make a unique contribution to tissue remodelling in allergic asthma.

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More information

Published date: 2004
Additional Information: Asthma
Keywords: fibroblast growth factor (fgf)-2, heparin, asthma

Identifiers

Local EPrints ID: 27427
URI: http://eprints.soton.ac.uk/id/eprint/27427
ISSN: 0040-6376
PURE UUID: 38a04df3-3194-476c-a465-bfb2f05695ff

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Date deposited: 26 Apr 2006
Last modified: 15 Mar 2024 07:18

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Contributors

Author: J.K. Shute
Author: N. Solic
Author: J. Shimizu
Author: W. McConnell
Author: A.E. Redington
Author: P.H. Howarth

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