Regulation of angiogenic growth factor expression by hypoxia, transition metals, and chelating agents

1995 ◽  
Vol 268 (6) ◽  
pp. C1362-C1368 ◽  
Author(s):  
J. M. Gleadle ◽  
B. L. Ebert ◽  
J. D. Firth ◽  
P. J. Ratcliffe
Keyword(s):  
Growth Factor ◽  
Chelating Agents ◽  
Transforming Growth Factor ◽  
Oxygen Sensing ◽  
Fold Increase ◽  
Vascular Endothelial ◽  
Vascular Growth ◽  
Regulated Expression ◽  
Endothelial Growth Factor ◽  
Iron Chelating Agents

Recent work has indicated that oxygen-sensing mechanism(s) resembling those controlling erythropoietin production operate in many non-erythropoietin-producing cells. To pursue the implication that such a system might control other genes, we studied oxygen-regulated expression of mRNAs for vascular endothelial growth factor, platelet-derived growth factor (PDGF) A and B chains, placental growth factor (PLGF), and transforming growth factor in four different cell lines and compared the characteristics with those of erythropoietin regulation. Oxygen-regulated expression was demonstrated for each gene in at least one cell type. However, the response to hypoxia (1% oxygen) varied markedly, ranging from a 13-fold increase (PDGF-B in Hep G2 cells) to a 2-fold decrease (PLGF in the trophoblastic line BeWo). For each gene/cell combination, both the magnitude and direction of the response to hypoxia were mimicked by exposure to cobaltous ions or two different iron-chelating agents, desferrioxamine and hydroxypyridinones. These similarities with established characteristics of erythropoietin regulation indicate that a similar mechanism of oxygen sensing is operating on a variety of vascular growth factors, and they suggest that chelatable iron is closely involved in the mechanism.

Vascular Endothelial Growth Factor Level Correlates With Transforming Growth Factor-β Isoform Levels in Pleural Effusions

CHEST Journal ◽  
2000 ◽  
Vol 118 (6) ◽  
pp. 1747-1753 ◽  
Author(s):  
Dong-sheng Cheng ◽  
Y. C. Gary Lee ◽  
Jeffrey T. Rogers ◽  
Elizabeth A. Perkett ◽  
J. Philip Moyers ◽  
...  
Keyword(s):  
Vascular Endothelial Growth Factor ◽  
Growth Factor ◽  
Transforming Growth Factor ◽  
Transforming Growth Factor Β ◽  
Vascular Endothelial ◽  
Pleural Effusions ◽  
Factor Level ◽  
Endothelial Growth Factor

scholarly journals Angiogenic and Inflammatory Properties of Psoriatic Arthritis

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Toshiyuki Yamamoto
Keyword(s):  
Psoriatic Arthritis ◽  
Growth Factor ◽  
Transforming Growth Factor ◽  
Synovial Fibroblasts ◽  
Osteoclast Formation ◽  
Endothelial Cell Migration ◽  
Vascular Endothelial ◽  
Inflammatory Arthropathy ◽  
Synovial Tissues ◽  
Endothelial Growth Factor

Psoriatic arthritis (PsA) is a chronic inflammatory arthropathy associated with psoriasis and included in seronegative spondyloarthropathy. PsA has several unique characteristics different from rheumatoid arthritis (RA), such as enthesopathy, dactylitis, and abnormal bone remodeling. As compared with synovitis of RA (pannus), proliferation of PsA synovium is mild and characterized by hypervascularity and increased infiltration of polymorphonuclear leukocytes in the synovial tissues. Angiogenesis plays a crucial role in cutaneous psoriasis, and several angiogenic factors such as vascular endothelial growth factor, interleukin-8, angiopoietin, tumor necrosis factor-α and transforming growth factor-β, are suggested to play an important role also in the pathophysiology of PsA. Further, IL-17 has various functions such as upregulation of proinflammatory cytokines, attraction of neutrophils, stimulation of keratinocytes, endothelial cell migration, and osteoclast formation via RANKL from activated synovial fibroblasts. Thus, IL-17 may be important in angiogenesis, fibrogenesis, and osteoclastogenesis in PsA. In this paper, roles of angiogenesis in the psoriatic synovium are discussed, which may strengthen the understanding of the pathogenesis of PsA.

Vascular endothelial growth factor-induced secretion of fibronectin is ERK dependent

2004 ◽  
Vol 286 (3) ◽  
pp. L539-L545 ◽  
Author(s):  
Altaf S. Kazi ◽  
Shidan Lotfi ◽  
Elena A. Goncharova ◽  
Omar Tliba ◽  
Yassine Amrani ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Vascular Endothelial Growth Factor ◽  
Smooth Muscle ◽  
Growth Factor ◽  
Transforming Growth Factor ◽  
Airway Remodeling ◽  
Vegf Receptor ◽  
Vascular Endothelial ◽  
Matrix Deposition ◽  
Endothelial Growth Factor

In severe asthma, cytokines and growth factors contribute to the proliferation of smooth muscle cells and blood vessels, and to the increased extracellular matrix deposition that constitutes the process of airway remodeling. Vascular endothelial growth factor (VEGF), which regulates vascular permeability and angiogenesis, also modulates the function of nonendothelial cell types. In this study, we demonstrate that VEGF induces fibronectin secretion by human airway smooth muscle (ASM) cells. In addition, stimulation of ASM with VEGF activates ERK, but not p38MAPK, and fibronectin secretion is ERK dependent. Both ERK activation and fibronectin secretion appear to be mediated through the VEGF receptor flt-1, as evidenced by the effects of the flt-1-specific ligand placenta growth factor. Finally, we demonstrate that ASM cells constitutively secrete VEGF, which is increased in response to PDGF, transforming growth factor-β, IL-1β, and PGE2. We conclude that ASM-derived VEGF, through modulation of the extracellular matrix, may play an important role in airway remodeling seen in asthma.

scholarly journals Pengaruh pemberian plasma kaya trombosit dan karbonat hidroksiapatit pada proses penutupan defek tulang kepala hewan coba tikus

2016 ◽  
Vol 8 (3) ◽  
Author(s):  
Lucia Nirmalasari ◽  
Maximillian Ch. Oley ◽  
Eko Prasetyo ◽  
Mendy Hatibie ◽  
Lily L. Loho
Keyword(s):  
Growth Factor ◽  
Transforming Growth Factor Beta ◽  
Rattus Norvegicus ◽  
Transforming Growth Factor ◽  
Platelet Rich Plasma ◽  
Platelet Derived Growth Factor ◽  
Vascular Endothelial ◽  
Angiogenesis Factor ◽  
Growth Factor Beta ◽  
Endothelial Growth Factor

Abstract: Recently, platelet rich plasma has been popular and its use has begin on human in developed countries. Platelet rich plasma is defined as autologus blood with concentration of platelets three to five times above baseline level, which contains at least seven growth factors like Platelet Derived Growth Factor (PDGF), Platelet Derived Angiogenesis Factor (PDAF), Platelet Derived Endothelial Growth Factor (PDEGF), Transforming Growth Factor Beta (TGF- β), Insulin like Growth Factor (IGF), Fibroblast Growth Factor (FGF), and Vascular Endothelial Growth Factor (VEGF). The golden standard for reconstruction of cranial bone defects demonstrates osteoconduction scaffold, osteoinduction like growth factors, and osteogenesis. Alloplastic biomaterials have revolutionalized craniofacial reconstruction. Carbonated hydroxyapatite (CHA) has been studied for years as implant material due to its similarity with the mineral component of bone. In this study we investigated and compare the effects of PRP and CHA on bone regeneration in rat cranial defects. This was an experimental study with a true experimental design on white male rats (Rattus norvegicus). Cranial deffects of 3 mm diameter were created in rat cranium and grafted with CHA and PRP combination, CHA alone, and control. The relationships among them were analyzed by using Mann Whitney and SPSS Statistics Program Package Version 22.0. The results showed that the experimental group of 2 weeks had no different between inflammatory reaction (P = 0.119), woven bone (P = 0.094) and lamellar bone (P = 0.130). At 4 weeks,a combination of PRP and CHA showed a superior growth of lamellar bone compared to CHA (P = 0.009). Conclusion: A combination of PRP and CHA in bone regeneration showed a histological tendency toward increased bone formation. However, future investigations should be conducted in different period times.Keywords: platelet rich plasma, carbonated hydroxyapatite, cranial defectAbstrak: Plasma kaya trombosit makin banyak digunakan dalam dunia kedokteran. Di negara maju pengunaannya sudah mulai diteliti pada manusia. Plasma kaya trombosit adalah fraksi plasma darah dengan konsentrasi platelet 3-5 kali diatas nilai normal yang mengandung sekurang-kurangnya 7 faktor pertumbuhan, diantaranya Platelet Derived Growth Factor (PDGF), Platelet Derived Angiogenesis Factor (PDAF), Platelet Derived Endothelial Growth Factor (PDEGF), Transforming Growth Factor Beta (TGF- β), Insulin like Growth Factor (IGF), Fibroblast Growth Factor (FGF), dan Vascular Endothelial Growth Factor (VEGF) yang dapat meningkatkan proses osteogenesis. Karbonat hidroksiapatit adalah material pengganti tulang yang dapat mempercepat regenerasi jaringan tulang serta memiliki kandungan kalsium,fosfat dan karbonat yang mirip dengan tulang manusia. Tulang yang tumbuh pada awal berupa tulang muda yang memiliki serat kolagen yang tidak teratur dan banyak osteosit disebut tulang imatur. Tulang imatur kemudian akan diganti oleh tulang matur yang memiliki serabut kolagen yang teratur. Jenis penelitian ini ialah eksperimental pada 36 hewan coba tikus putih wistar (Rattus norvegicus). Defek kalvaria pada tikus dengan diameter 3 mm diisi sesuai perlakuan: plasma kaya trombosit dengan karbonat hidroksiapatit, karbonat apatit tunggal, dan kontrol. Plasma kaya trombosit dibuat dari autologus darah tikus yang diberi perlakuan plasma kaya trombosit serta karbonat hidroksiapatit dan karbonat apatit tunggal. Data dianalisis dengan uji Mann Whitney dan diolah dengan SPSS. Hasil penelitian memperlihatkan pada minggu ke-2, tidak terdapat perbedaan bermakna reaksi inflamasi (P = 0,119), tulang imatur (P = 0,094), dan tulang matur (P = 0,130) diantara ketiga perlakuan. Pada minggu ke-4, tulang matur yang terbentuk lebih banyak pada perlakuan plasma kaya trombosit dan karbonat hidroksiapatit (P = 0,009). Simpulan: Pemberian plasma kaya trombosit dan karbonat hidroksiapatit dapat meningkatkan proses penutupan defek tulang kepala hewan percobaan tikus.Kata kunci : plasma kaya trombosit, karbonat hidroksiapatit, defek tulang kepala.

Anterior Diffuse Retinoblastoma: Mutational Analysis and Immunofluorescence Staining

2009 ◽  
Vol 133 (8) ◽  
pp. 1215-1218
Author(s):  
Michelle B. Crosby ◽  
G. Baker Hubbard ◽  
Brenda L. Gallie ◽  
Hans E. Grossniklaus
Keyword(s):  
Growth Factor ◽  
Transforming Growth Factor ◽  
Mutational Analysis ◽  
Hypoxia Inducible Factor ◽  
Transforming Growth Factor Β ◽  
Immunofluorescence Staining ◽  
Vascular Endothelial ◽  
Factor Α ◽  
Oxide Synthase ◽  
Endothelial Growth Factor

Abstract Retinoblastoma is the most common primary intraocular tumor of childhood and may be heritable or occur sporadically. Anterior diffuse retinoblastoma is an uncommon variant that is thought to be sporadic. We describe a child with anterior diffuse retinoblastoma who presented with a pseudohypopyon. Genetic analysis showed a germline mutation of the RB1 allele that is potentially heritable. Immunofluorescence staining was positive for transforming growth factor β and for vascular endothelial growth factor and negative for inducible nitric oxide synthase and for hypoxia inducible factor α in the tumor seeds, indicating acquisition of nonischemia-mediated survival factors of the tumor seeds in the aqueous humor.

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