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. 1994 Mar;49(3):225–232. doi: 10.1136/thx.49.3.225

Transforming growth factor beta 1 gene expression in human airways.

J D Aubert 1, B I Dalal 1, T R Bai 1, C R Roberts 1, S Hayashi 1, J C Hogg 1
PMCID: PMC1021150  PMID: 8202878

Abstract

BACKGROUND--Asthmatic airways have a characteristic deposition of connective tissue under the epithelial basement membrane, but the mediators involved in this alteration are unknown. Several authors have postulated that transforming growth factor beta 1 (TGF-beta 1) could be overexpressed in asthmatic airways. METHODS--Lung samples from 16 asthmatic patients, six patients with chronic obstructive pulmonary disease (COPD), and six non-obstructed smokers were analysed. RNA was extracted from these tissues to measure expression of TGF-beta 1 by Northern blot analysis using a cDNA probe for TGF-beta 1. The level of expression was quantitated by densitometry using glyceraldehyde 3-phosphate dehydrogenase mRNA as a control. TGF-beta 1 was localised to specific cell types in these lungs by immunohistochemical analysis using polyclonal antibodies specific for intracellular and extracellular TGF-beta 1. RESULTS--The 2.5 kb TGF-beta 1 mRNA was seen in all 18 samples analysed by Northern blotting and densitometric analysis showed no difference between the asthmatic group (mean (SD) 108% (43%)), the group with COPD (122% (33%)), and the non-obstructed group (100% (49%)). The TGF-beta 1 precursor was immunolocalised throughout the airway wall including the epithelium and in alveolar macrophages. The mature TGF-beta 1 was localised primarily within the connective tissue of the airway wall. These patterns of expression of both forms of TGF-beta 1 were similar in lungs from asthmatic patients, those with COPD, and controls. CONCLUSIONS--While TGF-beta 1 mRNA and protein are abundantly expressed in human lungs, there is no clear difference in expression between the airways of asthmatic subjects and those of smokers with and without COPD.

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Selected References

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