scholarly journals Platelet-activating factor exerts mitogenic activity and stimulates expression of interleukin 6 and interleukin 8 in human lung fibroblasts via binding to its functional receptor.

1996 ◽  
Vol 184 (1) ◽  
pp. 191-201 ◽  
Author(s):  
M Roth ◽  
M Nauck ◽  
S Yousefi ◽  
M Tamm ◽  
K Blaser ◽  
...  
Keyword(s):  
Pertussis Toxin ◽  
Tyrosine Kinases ◽  
Human Lung ◽  
Human Fibroblasts ◽  
Platelet Activating Factor ◽  
Lung Fibroblasts ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Human Lung Fibroblasts ◽  
Paf Receptor

Platelet-activating factor (PAF) is a potent proinflammatory phospholipid mediator of the lung. In this study, we demonstrate that PAF receptor mRNA and protein is expressed by human lung fibroblasts. Interaction of PAF with its specific receptor resulted in increases of tyrosine phosphorylation of several intracellular proteins, indicating that the PAF-receptor might be functionally active. PAF-induced transcription of protooncogenes c-fos and c-jun as well as of interleukin (IL)-6 and IL-8 genes in human fibroblasts. Transcription of the interleukins was followed by secretion of the respective proteins. Moreover, PAF enhanced proliferation of fibroblasts in a concentration-dependent manner. Using signaling inhibitors, we demonstrate that PAF-induced transcription of the c-fos, IL-6, and IL-8 genes, as well as proliferation, require activation of pertussis toxin-sensitive G proteins, tyrosine kinases, and protein kinase C (PKC). In contrast, transcription of c-jun was blocked by pertussis toxin, but not by inhibitors for tyrosine kinases or PKC. These data suggest that PAF stimulates distinct signaling pathways in human lung fibroblasts. In addition, the activation of human fibroblasts by PAF leads to enhanced proliferation and to the expression of proinflammatory cytokines, which may contribute to the pathophysiological changes in pulmonary inflammation.

TNF-± Induces TSLP Expression By Human Lung Fibroblasts In An AP-1 / JNK Dependent Manner

2010 ◽  
Author(s):  
Arnab Datta ◽  
Chris J. Scotton ◽  
Alejandro Ortiz-Stern ◽  
Robin J. McAnulty ◽  
Rachel C. Chambers
Keyword(s):  
Human Lung ◽  
Lung Fibroblasts ◽  
Dependent Manner ◽  
Human Lung Fibroblasts

TGF-β1 Induces Tissue Factor Expression in Human Lung Fibroblasts in a PI3K/JNK/Akt-Dependent and AP-1–Dependent Manner

2012 ◽  
Vol 47 (5) ◽  
pp. 614-627 ◽  
Author(s):  
Malgorzata Wygrecka ◽  
Dariusz Zakrzewicz ◽  
Brigitte Taborski ◽  
Miroslava Didiasova ◽  
Grazyna Kwapiszewska ◽  
...  
Keyword(s):  
Tissue Factor ◽  
Human Lung ◽  
Lung Fibroblasts ◽  
Dependent Manner ◽  
Tissue Factor Expression ◽  
Human Lung Fibroblasts ◽  
Factor Expression ◽  
Tgf Β1

scholarly journals Membrane-associated chondroitin sulfate proteoglycans of human lung fibroblasts.

1989 ◽  
Vol 108 (3) ◽  
pp. 1165-1173 ◽  
Author(s):  
G David ◽  
V Lories ◽  
A Heremans ◽  
B Van der Schueren ◽  
J J Cassiman ◽  
...  
Keyword(s):  
Chondroitin Sulfate ◽  
Human Lung ◽  
Core Protein ◽  
Human Fibroblasts ◽  
Chondroitin Sulfate Proteoglycans ◽  
Lung Fibroblasts ◽  
Hydrophobic Membrane ◽  
Human Lung Fibroblasts ◽  
Core Proteins

Cultured human fetal lung fibroblasts produce some chondroitin sulfate proteoglycans that are extracted as an aggregate in chaotropic buffers containing 4 M guanidinium chloride. The aggregated proteoglycans are excluded from Sepharose CL4B and 2B, but become included, eluting with a Kav value of 0.53 from Sepharose CL4B, when Triton X-100 is included in the buffer. Conversely, some of the detergent-extractable chondroitin sulfate proteoglycans can be incorporated into liposomes, suggesting the existence of a hydrophobic membrane-intercalated chondroitin sulfate proteoglycan fraction. Purified preparations of hydrophobic chondroitin sulfate proteoglycans contain two major core protein forms of 90 and 52 kD. A monoclonal antibody (F58-7D8) obtained from the fusion of myeloma cells with spleen cells of BALB/c mice that were immunized with hydrophobic proteoglycans recognized the 90- but not the 52-kD core protein. The epitope that is recognized by the antibody is exposed at the surface of cultured human lung fibroblasts and at the surface of several stromal cells in vivo, but also at the surface of Kupffer cells and of epidermal cells. The core proteins of these small membrane-associated chondroitin sulfate proteoglycans are probably distinct from those previously identified in human fibroblasts by biochemical, immunological, and molecular biological approaches.

scholarly journals Differential regulation of metalloproteinase production, proliferation and chemotaxis of human lung fibroblasts by PDGF, Interleukin-1β and TNF-α

2000 ◽  
Vol 9 (3-4) ◽  
pp. 155-160 ◽  
Author(s):  
Masahiro Sasaki ◽  
Masayuki Kashima ◽  
Takefumi Ito ◽  
Akiko Watanabe ◽  
Noriko Izumiyama ◽  
...  
Keyword(s):  
Matrix Metalloproteinase ◽  
Human Lung ◽  
Lung Fibroblast ◽  
Differential Sensitivity ◽  
Lung Fibroblasts ◽  
Type I ◽  
Dependent Manner ◽  
Human Lung Fibroblast ◽  
Human Lung Fibroblasts ◽  
Tnf Α

Fibroblast migration, proliferation, extracellular matrix protein synthesis and degradation,all of which play important roles in inflammation, are them selves induced by various growth factors and cytokines. Less is known about the interaction of these substances on lung fibroblast function in pulmonary fibrosis.The goal of this study was to investigate the effects of PDGF alone and in combination with IL–1β and TNF–α on the production of human lung fibroblast matrix metalloproteinases, proliferation, and the chemotactic response. The assay for MMPs activity against FITC labeled type I and IV collagen was based on the specificity of the enzyme cleavage of collagen. Caseinolytis and gelatinolytic activities of secreted proteinases were analyzed by zymography. Fibronectin in conditioned media was measured using human lung fibronectin enzyme immunoassay. Cell proliferation was measured by 3H-Thymidine incorporation assay. Cell culture supernatants were tested for PGE2 content by ELISA. Chemotactic activity was measured using the modified Boyden chamber.Matrix metalloproteinase assay indicated that IL–1β, TNF–α and PDGF induced intestitial collagenase (MMP-1) production. MMP assay also indicated that IL–1β and TNF–α had inhibitory effects on MMP-2,9(gelatinaseA,B) production. Casein zymography confirmed that IL–1β stimulated stromlysin (matrix metalloproteinase 3; MMP–3) and gelatin zymography demonstrated that TNF–α induced MMP–9 production in human lung fibroblast, whereas PDGF alone did not. PDGF in combination with IL–1β and TNF–α induced MMP–3 and MMP–9 activity, as demonstrated by zymography. PDGF stimulated lung fibroblast proliferation in a concentration-dependent manner, whereas IL–1β and TNF–α alone had no effect. In contrast, the proliferation of human lung fibroblasts by PDGF was inhibited in the presence of IL–1β and TNF–α, and this inhibition was not a consequence of any elevation of PGE2. PDGF stimulated fibroblast chemotaxis in a concentrationdependent manner, and this stimulation was augmented by combining PDGF with IL–1β and TNF–α.These findings suggested that PDGF differentially regulated MMPs production in combination with cytokines, and further that MMP assay and zymography had differential sensitivity for detecting MMPs. The presence of cytokines with PDGF appears to modulate the proliferation and chemotaxis of human lung fibroblasts.

scholarly journals Amorphous Silica Nanoparticles Obtained by Laser Ablation Induce Inflammatory Response in Human Lung Fibroblasts

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1026 ◽  
Author(s):  
Sorina Voicu ◽  
Mihaela Balas ◽  
Miruna Stan ◽  
Bogdan Trică ◽  
Andreea Serban ◽  
...  
Keyword(s):  
Inflammatory Response ◽  
Silica Nanoparticles ◽  
Human Lung ◽  
Lung Fibroblasts ◽  
No Production ◽  
Dependent Manner ◽  
Amorphous Sio2 ◽  
Human Lung Fibroblasts ◽  
Transmission Electron ◽  
Cox 2

Silica nanoparticles (SiO2 NPs) represent environmentally born nanomaterials that are used in multiple biomedical applications. Our aim was to study the amorphous SiO2 NP-induced inflammatory response in MRC-5 human lung fibroblasts up to 72 hours of exposure. The intracellular distribution of SiO2 NPs was measured by transmission electron microscopy (TEM). The lactate dehydrogenase (LDH) test was used for cellular viability evaluation. We have also investigated the lysosomes formation, protein expression of interleukins (IL-1β, IL-2, IL-6, IL-8, and IL-18), COX-2, Nrf2, TNF-α, and nitric oxide (NO) production. Our results showed that the level of lysosomes increased in time after exposure to the SiO2 NPs. The expressions of interleukins and COX-2 were upregulated, whereas the expressions and activities of MMP-2 and MMP-9 decreased in a time-dependent manner. Our findings demonstrated that the exposure of MRC-5 cells to 62.5 µg/mL of SiO2 NPs induced an inflammatory response.

Prostacyclin analogs stimulate VEGF production from human lung fibroblasts in culture

2008 ◽  
Vol 294 (6) ◽  
pp. L1226-L1232 ◽  
Author(s):  
Koichiro Kamio ◽  
Tadashi Sato ◽  
Xiangde Liu ◽  
Hisatoshi Sugiura ◽  
Shinsaku Togo ◽  
...  
Keyword(s):  
Human Lung ◽  
Mesenchymal Cells ◽  
Lung Fibroblasts ◽  
Intracellular Camp ◽  
Alveolar Wall ◽  
Mrna Levels ◽  
Dependent Manner ◽  
Collagen Gels ◽  
Human Lung Fibroblasts ◽  
Cell Functions

Prostacyclin is a short-lived metabolite of arachidonic acid that is produced by several cells in the lung and prominently by endothelial cells. It increases intracellular cAMP levels activating downstream signaling thus regulating vascular mesenchymal cell functions. The alveolar wall contains a rich capillary network as well as a population of mesenchymal cells, i.e., fibroblasts. The current study evaluated the hypothesis that prostacyclin may mediate signaling between endothelial and mesenchymal cells in the alveolar wall by assessing the ability of prostacyclin analogs to modulate fibroblast release of VEGF. To accomplish this study, human lung fibroblasts were cultured in routine culture on plastic support and in three-dimensional collagen gels with or without three prostacyclin analogs, carbaprostacyclin, iloprost, and beraprost, and the production of VEGF was evaluated by ELISA and quantitative real-time PCR. Iloprost and beraprost significantly stimulated VEGF mRNA levels and protein release in a concentration-dependent manner. These effects were blocked by the adenylate cyclase inhibitor SQ-22536 and by the protein kinase A (PKA) inhibitor KT-5720 and were reproduced by a direct PKA activator but not by an activator of exchange protein directly activated by cAMP (Epac), indicating that cAMP-activated PKA signaling mediated the effect. Since VEGF serves to maintain the pulmonary microvasculature, the current study suggests that prostacyclin is part of a bidirectional signaling network between the mesenchymal and vascular cells of the alveolar wall. Prostacyclin analogs, therefore, have the potential to modulate the maintenance of the pulmonary microcirculation by driving the production of VEGF from lung fibroblasts.

scholarly journals Serum albumin enhances the uptake of [3H]cholesterol from phosphatidylcholine vesicles by cultured human fibroblasts

1984 ◽  
Vol 220 (2) ◽  
pp. 605-608 ◽  
Author(s):  
J P Slotte ◽  
S Björkerud
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Human Lung ◽  
Exchange Process ◽  
Human Fibroblasts ◽  
Lung Fibroblasts ◽  
Molar Ratio ◽  
Human Lung Fibroblasts ◽  
Cultured Human Fibroblasts

Cultured human lung fibroblasts, incubated with cholesterol/phosphatidylcholine vesicles (cholesterol: phosphatidylcholine molar ratio 1:1) incorporated vesicle [3H]-cholesterol linearly for at least 48 h by an exchange process without gaining sterol mass. The incorporation of [3H]cholesterol by the cells was markedly enhanced in the presence of purified bovine serum albumin. A fraction of the incorporated vesicle [3H]cholesterol was esterified by the cells.

Human lung fibroblasts release chemokinetic activity for monocytes constitutively

1998 ◽  
Vol 275 (2) ◽  
pp. L223-L230 ◽  
Author(s):  
Sekiya Koyama ◽  
Etsuro Sato ◽  
Tsuyoshi Masubuchi ◽  
Akemi Takamizawa ◽  
Hiroshi Nomura ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Sieve ◽  
Transforming Growth Factor ◽  
Human Lung ◽  
Lung Fibroblasts ◽  
Dependent Manner ◽  
Lipoxygenase Inhibitors ◽  
Human Lung Fibroblasts ◽  
Gm Csf ◽  
Molecular Sieve Column

We determined whether human lung fibroblasts (HLFs) might release mediators that are responsible for monocyte chemokinetic activity (MCA) constitutively. HLF supernatant fluids showed MCA in a time-dependent manner ( P < 0.001). Checkerboard analysis of 24- and 72-h supernatant fluids showed that the activity was chemokinetic. Partial characterization of 24- and 72-h supernatant fluids revealed that the mediators released after 24 h were predominantly composed of lipid-soluble activity, and MCA was blocked by lipoxygenase inhibitors. The mediators released after 72 h were predominantly trypsin sensitive and blocked by cycloheximide. Molecular-sieve column chromatography identified four peaks of MCA. A polyclonal antibody to monocyte chemoattractant protein-1 (MCP-1) inhibited MCA by 20% after 24 h and by 40% after 72 h. Granulocyte-macrophage colony-stimulating factor (GM-CSF) and transforming growth factor-β (TGF-β) antibodies attenuated MCA released after 72 h by 30 and 10%, respectively. These antibodies inhibited corresponding molecular-weight peaks separated by molecular-sieve column. The concentrations of MCP-1, GM-CSF, and TGF-β were 4,698 ± 242, 26.8 ± 3.8, and 550 ± 15 pg/ml, respectively. A leukotriene B4(LTB4)-receptor antagonist attenuated the total MCA and the lowest molecular weight peak of MCA. The concentrations of LTB4were 153.4 ± 12.4 (24 h) and 212 ± 16.6 (72 h) pg/ml. These findings suggest that HLFs may modulate the recruitment of monocytes into the lung by releasing MCP-1, GM-CSF, TGF-β, and LTB4constitutively.

scholarly journals Pharmacologic inhibition of lactate production prevents myofibroblast differentiation

2015 ◽  
Vol 309 (11) ◽  
pp. L1305-L1312 ◽  
Author(s):  
Robert Matthew Kottmann ◽  
Emma Trawick ◽  
Jennifer L. Judge ◽  
Lindsay A. Wahl ◽  
Amali P. Epa ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Pulmonary Fibrosis ◽  
Human Lung ◽  
Lung Fibroblasts ◽  
Myofibroblast Differentiation ◽  
Dependent Manner ◽  
Human Lung Fibroblasts ◽  
Ldh Activity ◽  
Dose Dependent ◽  
Pharmacologic Inhibition

Myofibroblasts are one of the primary cell types responsible for the accumulation of extracellular matrix in fibrosing diseases, and targeting myofibroblast differentiation is an important therapeutic strategy for the treatment of pulmonary fibrosis. Transforming growth factor-β (TGF-β) has been shown to be an important inducer of myofibroblast differentiation. We previously demonstrated that lactate dehydrogenase and its metabolic product lactic acid are important mediators of myofibroblast differentiation, via acid-induced activation of latent TGF-β. Here we explore whether pharmacologic inhibition of LDH activity can prevent TGF-β-induced myofibroblast differentiation. Primary human lung fibroblasts from healthy patients and those with pulmonary fibrosis were treated with TGF-β and or gossypol, an LDH inhibitor. Protein and RNA were analyzed for markers of myofibroblast differentiation and extracellular matrix generation. Gossypol inhibited TGF-β-induced expression of the myofibroblast marker α-smooth muscle actin (α-SMA) in a dose-dependent manner in both healthy and fibrotic human lung fibroblasts. Gossypol also inhibited expression of collagen 1, collagen 3, and fibronectin. Gossypol inhibited LDH activity, the generation of extracellular lactic acid, and the rate of extracellular acidification in a dose-dependent manner. Furthermore, gossypol inhibited TGF-β bioactivity in a dose-dependent manner. Concurrent treatment with an LDH siRNA increased the ability of gossypol to inhibit TGF-β-induced myofibroblast differentiation. Gossypol inhibits TGF-β-induced myofibroblast differentiation through inhibition of LDH, inhibition of extracellular accumulation of lactic acid, and inhibition of TGF-β bioactivity. These data support the hypothesis that pharmacologic inhibition of LDH may play an important role in the treatment of pulmonary fibrosis.

scholarly journals LncRNA-RP11 Modulates TGF-β1-Activated Radiation-Induced Lung Injury Through Downregulating microRNA-29a

Dose-Response ◽  
2020 ◽  
Vol 18 (4) ◽  
pp. 155932582094907
Author(s):  
Xi Yang ◽  
Jianjiao Ni ◽  
Yida Li ◽  
Liqing Zou ◽  
Tiantian Guo ◽  
...  
Keyword(s):  
Lung Injury ◽  
Human Lung ◽  
Human Fibroblasts ◽  
Bioinformatic Analysis ◽  
Fine Tuning ◽  
Lung Fibroblasts ◽  
Human Lung Fibroblasts ◽  
Thoracic Radiation ◽  
Radiation Induced ◽  
Tgf Β1

Radiation-induced lung injury (RILI) is one of the most serious complications of thoracic radiation and TGF-β1 is a central regulator of RILI. However, the molecular mechanism underlying the fine tuning of TGF-β1 signaling in RILI has not been fully understood. In the current study, differentially expressed long non-coding RNAs (LncRNAs) among human lung fibroblasts cell lines HFL-1 and WI-38 treated with TGF-β1, were identified by microarray and validated by real time PCR. LncRNA-RP11 was found to be the most increased LncRNA and it mediated the promotion of fibrogenic activity in human lung fibroblasts after TGF-β1 treatment. Bioinformatic analysis revealed that TGF-β1 may be associated with the component and structure of extracellular matrix in lung fibroblasts cells, and LncRNA-RP11 was predicted and confirmed to be a competing endogenous RNA by directly binding to miR-29a. Functional experiments investigating the biological role of LncRNA-RP11/miR-29a axis in RILI, were then carried out in human fibroblasts. The results showed that radiation promoted the expression of LncRNA-RP11, but regressed the expression of miR-29a. Furthermore, radiation elevated the expression of various common collagenic proteins, which could be abolished by overexpression of miR-29a.

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