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.
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.
Authors: Inkyung Kang; Ingrid A Harten; Mary Y Chang; Kathleen R Braun; Alyssa Sheih; Mary P Nivison; Pamela Y Johnson; Gail Workman; Gernot Kaber; Stephen P Evanko; Christina K Chan; Mervyn J Merrilees; Steven F Ziegler; Michael G Kinsella; Charles W Frevert; Thomas N Wight Journal: J Biol Chem Date: 2016-11-28 Impact factor: 5.157
Authors: Wiparat Manuyakorn; David E Smart; Antonio Noto; Fabio Bucchieri; Hans Michael Haitchi; Stephen T Holgate; Peter H Howarth; Donna E Davies Journal: PLoS One Date: 2016-04-21 Impact factor: 3.240
Authors: Marta Michalik; Katarzyna Wójcik-Pszczoła; Milena Paw; Dawid Wnuk; Paulina Koczurkiewicz; Marek Sanak; Elżbieta Pękala; Zbigniew Madeja Journal: Cell Mol Life Sci Date: 2018-08-12 Impact factor: 9.261