Platelet derived growth factor-evoked Ca2+ wave and matrix gene expression through phospholipase C in human pulmonary fibroblast

The primary role of fibroblasts is production and degradation of extracellular matrix, and thus it helps in the structural framework of tissues. The close relation between fibroblast malfunction and many diseases such as chronic obstructive pulmonary disease, asthma, and fibrosis is widely accepted....

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Bibliographic Details
Published in:The international journal of biochemistry & cell biology 2013-07, Vol.45 (7), p.1516-1524
Main Authors: Mukherjee, Subhendu, Duan, Fuqin, Kolb, Martin R.J., Janssen, Luke J.
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
asthma
calcium
Calcium - metabolism
Calcium Channel Blockers
Calcium signaling
Calcium Signaling - drug effects
Calcium Signaling - physiology
Cells, Cultured
chronic diseases
collagen
Collagen Type I - biosynthesis
cyclopiazonic acid
cytokines
Estrenes
Extracellular matrix
Extracellular Matrix - genetics
Extracellular Matrix - metabolism
Female
fibroblasts
Fibroblasts - drug effects
Fibroblasts - metabolism
Fibronectins - biosynthesis
Fibrosis
fluorometry
gene expression
Gene Expression - drug effects
Gene Expression Regulation
genes
Humans
Indoles
Inositol 1,4,5-Trisphosphate Receptors - antagonists & inhibitors
Inositol 1,4,5-Trisphosphate Receptors - metabolism
Lung - cytology
lungs
Macrocyclic Compounds
Male
Middle Aged
Oxazoles
phospholipase C
platelet-derived growth factor
Platelet-Derived Growth Factor - drug effects
Platelet-Derived Growth Factor - metabolism
Pyrrolidinones
reverse transcriptase polymerase chain reaction
Ryanodine
Ryanodine Receptor Calcium Release Channel
Type C Phospholipases - antagonists & inhibitors
Type C Phospholipases - metabolism
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Summary:The primary role of fibroblasts is production and degradation of extracellular matrix, and thus it helps in the structural framework of tissues. The close relation between fibroblast malfunction and many diseases such as chronic obstructive pulmonary disease, asthma, and fibrosis is widely accepted. Fibroblasts are known to respond to different growth factors and cytokines including platelet-derived growth factors (PDGF). However, the intracellular signaling mechanisms are not entirely clear. In addition to complex phosphorylation-driven signaling pathways, PDGF is also known to work through Ca2+ signaling. We hypothesize that in human pulmonary fibroblasts, Ca2+ waves play an important role in PDGF-mediated changes. To test this hypothesis, we treated human pulmonary fibroblasts, obtained from the lungs of ten donors, with PDGF acutely or overnight plus/minus a variety of blockers under various conditions. Ca2+ waves were monitored by confocal [Ca2+]i fluorimetry, while gene expression of extracellular matrix genes was assessed via RT-PCR method. We found that both acute and overnight PDGF treatment evoked Ca2+ waves. Removal of external Ca2+ or depletion of internal Ca2+ store using Cyclopiazonic acid (CPA) completely occluded PDGF-evoked Ca2+ waves. Ryanodine, which blocks ryanodine receptor channels, had no effect on PDGF-evoked Ca2+ wave, whereas the phospholipase C inhibitor U73122 and Xestospongin C, a potent IP3 receptor blocker, reduced the rapid PDGF-response to a relatively slowly-developing rise in [Ca2+]i. We also found that PDGF dramatically increased the expression of fibronectin1 and collagen A1 genes, which was reversed by the use of CPA or U73122. Our study indicates that, in human pulmonary fibroblasts, PDGF acts through IP3-induced Ca2+-release to trigger Ca2+ waves, which in turn modulate gene expression of several matrix proteins.
ISSN:1357-2725
1878-5875
DOI:10.1016/j.biocel.2013.04.018