AI Article Synopsis
- The study investigates how fibroblasts from asthmatic patients respond to mechanical strain, hypothesizing that they would increase proteoglycan (PG) expression.
- Fibroblasts were cultured from both asthmatics and healthy individuals, then subjected to a 24-hour mechanical stretch to analyze mRNA levels of PGs like decorin and versican.
- Results revealed that asthmatic fibroblasts not only had higher baseline decorin levels but also showed a greater increase in versican expression when strained, highlighting a potential mechanism for airway remodeling in asthma.
Article Abstract
Background: Remodelling of the asthmatic airway includes increased deposition of proteoglycan (PG) molecules. One of the stimuli driving airway remodelling may be excessive mechanical stimulation.
Objective: We hypothesized that fibroblasts from asthmatic patients would respond to excessive mechanical strain with up-regulation of message for PGs.
Methods: We obtained fibroblasts from asthmatic patients (AF) and normal volunteers (NF) using endobronchial biopsy. Cells were maintained in culture until the fifth passage and then grown on a flexible collagen-coated membrane. Using the Flexercell device, cells were then subjected to cyclic stretch at 30% amplitude at 1 Hz for 24 h. Control cells were unstrained. Total RNA was extracted from the cell layer and quantitative RT-PCR performed for decorin, lumican and versican mRNA.
Results: In unstrained cells, the expression of decorin mRNA was greater in AF than NF. With strain, NF showed increased expression of versican mRNA and AF showed increased expression of versican and decorin mRNA. The relative increase in versican mRNA expression with strain was greater in AF than NF.
Conclusions: These data support the hypothesis that proteoglycan message is increased in asthmatic fibroblasts subject to mechanical strain. This finding has implications for the mechanisms governing airway wall remodelling in asthma.
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| http://dx.doi.org/10.1111/j.1365-2222.2004.01980.x | DOI Listing |
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