Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells

Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells. Platelet-derived growth factor (PDGF)-B regulates mesangial cell and vessel development during embryogenesis, and contributes to the pathogenesis of adult renal and vascular diseases. Endothelial cell...

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Veröffentlicht in:Kidney international 2005-08, Vol.68 (2), p.695-703
Hauptverfasser: Eng, Eudora, Holgren, Cory, Hubchak, Susan, Naaz, Parveen, Schnaper, H. William
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creator Eng, Eudora
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Hubchak, Susan
Naaz, Parveen
Schnaper, H. William
description Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells. Platelet-derived growth factor (PDGF)-B regulates mesangial cell and vessel development during embryogenesis, and contributes to the pathogenesis of adult renal and vascular diseases. Endothelial cell PDGF-B exerts paracrine effects on mesangial cells, but its regulation is not well defined. We examined the impact of hypoxia on PDGF-B-mediated interactions between glomerular endothelial and mesangial cells, a condition of potential relevance in developing, and diseased adult, kidneys. Glomerular endothelial or mesangial cells were subjected to hypoxia and responses compared to normoxic cells. Endothelial PDGF-B was studied by Northern and Western analysis. Mesangial proliferative responses to PDGF-B were assessed by3H-thymidine incorporation, and migration by a modified Boyden chamber assay. Hypoxia-induced changes in receptor specific binding capacity were studied by saturation binding assays. Hypoxia stimulated increases in endothelial PDGF-B mRNA and protein. In normoxic mesangial cells, PDGF-B stimulated dose-dependent proliferation, but the proliferative response of hypoxic cells was two to three times greater. Exogenous PDGF-B also caused prompter migration in hypoxic mesangial cells. Mesangial cells were treated with endothelial cell-conditioned medium. More cells migrated when hypoxic cells were stimulated with hypoxic conditioned medium, than when normoxic cells were stimulated with normoxic conditioned medium. Preincubating conditioned medium with PDGF-B neutralizing antibody greatly decreased the chemoattractant activity. Binding studies demonstrated increased specific binding capacity in hypoxic cells. Hypoxia enhances PDGF-B paracrine interactions between glomerular endothelial and mesangial cells. These hypoxia-regulated interactions may be important during glomerulogenesis in fetal life and during the pathogenesis of adult glomerular disease.
doi_str_mv 10.1111/j.1523-1755.2005.00448.x
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William</creatorcontrib><title>Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells</title><title>Kidney international</title><addtitle>Kidney Int</addtitle><description>Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells. Platelet-derived growth factor (PDGF)-B regulates mesangial cell and vessel development during embryogenesis, and contributes to the pathogenesis of adult renal and vascular diseases. Endothelial cell PDGF-B exerts paracrine effects on mesangial cells, but its regulation is not well defined. We examined the impact of hypoxia on PDGF-B-mediated interactions between glomerular endothelial and mesangial cells, a condition of potential relevance in developing, and diseased adult, kidneys. Glomerular endothelial or mesangial cells were subjected to hypoxia and responses compared to normoxic cells. Endothelial PDGF-B was studied by Northern and Western analysis. 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William</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells</atitle><jtitle>Kidney international</jtitle><addtitle>Kidney Int</addtitle><date>2005-08-01</date><risdate>2005</risdate><volume>68</volume><issue>2</issue><spage>695</spage><epage>703</epage><pages>695-703</pages><issn>0085-2538</issn><eissn>1523-1755</eissn><coden>KDYIA5</coden><abstract>Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells. Platelet-derived growth factor (PDGF)-B regulates mesangial cell and vessel development during embryogenesis, and contributes to the pathogenesis of adult renal and vascular diseases. Endothelial cell PDGF-B exerts paracrine effects on mesangial cells, but its regulation is not well defined. We examined the impact of hypoxia on PDGF-B-mediated interactions between glomerular endothelial and mesangial cells, a condition of potential relevance in developing, and diseased adult, kidneys. Glomerular endothelial or mesangial cells were subjected to hypoxia and responses compared to normoxic cells. Endothelial PDGF-B was studied by Northern and Western analysis. Mesangial proliferative responses to PDGF-B were assessed by3H-thymidine incorporation, and migration by a modified Boyden chamber assay. Hypoxia-induced changes in receptor specific binding capacity were studied by saturation binding assays. Hypoxia stimulated increases in endothelial PDGF-B mRNA and protein. In normoxic mesangial cells, PDGF-B stimulated dose-dependent proliferation, but the proliferative response of hypoxic cells was two to three times greater. Exogenous PDGF-B also caused prompter migration in hypoxic mesangial cells. Mesangial cells were treated with endothelial cell-conditioned medium. More cells migrated when hypoxic cells were stimulated with hypoxic conditioned medium, than when normoxic cells were stimulated with normoxic conditioned medium. Preincubating conditioned medium with PDGF-B neutralizing antibody greatly decreased the chemoattractant activity. Binding studies demonstrated increased specific binding capacity in hypoxic cells. Hypoxia enhances PDGF-B paracrine interactions between glomerular endothelial and mesangial cells. These hypoxia-regulated interactions may be important during glomerulogenesis in fetal life and during the pathogenesis of adult glomerular disease.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>16014047</pmid><doi>10.1111/j.1523-1755.2005.00448.x</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects Animals
Biological and medical sciences
Cattle
Cell Communication - physiology
Cell Membrane - metabolism
Cell Movement - physiology
Cells, Cultured
Endothelial Cells - cytology
Endothelial Cells - metabolism
glomerular endothelial cell
Glomerular Mesangium - cytology
Glomerular Mesangium - metabolism
hypoxia
Hypoxia - metabolism
Hypoxia - pathology
Hypoxia - physiopathology
Hypoxia-Inducible Factor 1, alpha Subunit
Kidney Glomerulus - blood supply
Kidney Glomerulus - cytology
Kidney Glomerulus - metabolism
Medical sciences
mesangial cell
Nephrology. Urinary tract diseases
PDGF-B
PDGF-β receptor
Protein Binding - physiology
Proto-Oncogene Proteins c-sis - genetics
Proto-Oncogene Proteins c-sis - metabolism
Receptor, Platelet-Derived Growth Factor beta - metabolism
renal organogenesis
specific binding capacity
Transcription Factors - metabolism
Transcription, Genetic - physiology
Vascular Endothelial Growth Factor A - metabolism
vessel formation
title Hypoxia regulates PDGF-B interactions between glomerular capillary endothelial and mesangial cells
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