ChloroquineV1, PubMed, Corpus, bibRecord, 000567

Binding, internalization, and degradation of basic fibroblast growth factor in human microvascular endothelial cells.

Identifieur interne : 000567 ( PubMed/Corpus ); précédent : 000566; suivant : 000568

Binding, internalization, and degradation of basic fibroblast growth factor in human microvascular endothelial cells.

Auteurs : A. Bikfalvi ; E. Dupuy ; A L Inyang ; N. Fayein ; G. Leseche ; Y. Courtois ; G. Tobelem

Source :

Experimental cell research [ 0014-4827 ] ; 1989.

RBID : pubmed:2917611

English descriptors

KwdEn :
- Binding Sites, Cell Membrane (metabolism), Cells, Cultured, Chloroquine (pharmacology), Endothelium, Vascular (metabolism), Fibroblast Growth Factors (metabolism), Humans, Hydrogen-Ion Concentration, Molecular Weight, Temperature.
MESH :
- chemical , metabolism : Fibroblast Growth Factors.
- chemical , pharmacology : Chloroquine.
- metabolism : Cell Membrane, Endothelium, Vascular.
- Binding Sites, Cells, Cultured, Humans, Hydrogen-Ion Concentration, Molecular Weight, Temperature.

Abstract

The binding, internalization, and degradation of basic fibroblast growth factor (bFGF) in human omental microvascular endothelial cells (HOME cells) were investigated. Binding studies of bFGF in human endothelial cells have not yet been reported. Basic FGF bound to HOME cells (KD of 42.0 +/- 3.8 pM and 70,526 +/- 6121 binding sites/cell for the high-affinity sites, KD of 0.933 +/- 0.27 nM and 630,252 +/- 172,459 sites/cell for low-affinity binding sites). The number of low-affinity binding sites was found to be variable. Washing the cells with 2 M phosphate-buffered saline removed completely 125I-bFGF bound to low-affinity binding sites but decreased also the high-affinity binding. The majority of the surface-bound 125I-bFGF was removed by washing the cells with acetic acid buffer at pH 3. At 37 degrees C, 30% of the cell-associated 125I-bFGF became resistant to the acidic wash after 90 min, suggesting that this fraction of bound 125I-bFGF was internalized. At this temperature, degradation of the internalized ligand was followed after 1 h by the appearance of three major bands of 15,000, 10,000, and 8,000 Da and was inhibited by chloroquine. These results demonstrated two classes of binding sites for bFGF in HOME cells; the number of high-affinity binding sites being larger than the number reported for bovine capillary endothelial cells. The intracellular processing of bFGF in HOME cells seems to be different from that of heparin binding growth factor-1 in murine lung capillary endothelial cells and of eye-derived growth factor-1 in Chinese hamster fibroblasts.

DOI: 10.1016/0014-4827(89)90183-3
PubMed: 2917611

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pubmed:2917611

Le document en format XML

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<author><name sortKey="Bikfalvi, A" sort="Bikfalvi, A" uniqKey="Bikfalvi A" first="A" last="Bikfalvi">A. Bikfalvi</name>
<affiliation><nlm:affiliation>INSERM U 150, Hôpital Lariboisière, Paris, France.</nlm:affiliation>
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<author><name sortKey="Dupuy, E" sort="Dupuy, E" uniqKey="Dupuy E" first="E" last="Dupuy">E. Dupuy</name>
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<author><name sortKey="Inyang, A L" sort="Inyang, A L" uniqKey="Inyang A" first="A L" last="Inyang">A L Inyang</name>
</author>
<author><name sortKey="Fayein, N" sort="Fayein, N" uniqKey="Fayein N" first="N" last="Fayein">N. Fayein</name>
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<author><name sortKey="Leseche, G" sort="Leseche, G" uniqKey="Leseche G" first="G" last="Leseche">G. Leseche</name>
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<author><name sortKey="Courtois, Y" sort="Courtois, Y" uniqKey="Courtois Y" first="Y" last="Courtois">Y. Courtois</name>
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<author><name sortKey="Tobelem, G" sort="Tobelem, G" uniqKey="Tobelem G" first="G" last="Tobelem">G. Tobelem</name>
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<term>Chloroquine (pharmacology)</term>
<term>Endothelium, Vascular (metabolism)</term>
<term>Fibroblast Growth Factors (metabolism)</term>
<term>Humans</term>
<term>Hydrogen-Ion Concentration</term>
<term>Molecular Weight</term>
<term>Temperature</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Fibroblast Growth Factors</term>
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<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Chloroquine</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Cell Membrane</term>
<term>Endothelium, Vascular</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Binding Sites</term>
<term>Cells, Cultured</term>
<term>Humans</term>
<term>Hydrogen-Ion Concentration</term>
<term>Molecular Weight</term>
<term>Temperature</term>
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<front><div type="abstract" xml:lang="en">The binding, internalization, and degradation of basic fibroblast growth factor (bFGF) in human omental microvascular endothelial cells (HOME cells) were investigated. Binding studies of bFGF in human endothelial cells have not yet been reported. Basic FGF bound to HOME cells (KD of 42.0 +/- 3.8 pM and 70,526 +/- 6121 binding sites/cell for the high-affinity sites, KD of 0.933 +/- 0.27 nM and 630,252 +/- 172,459 sites/cell for low-affinity binding sites). The number of low-affinity binding sites was found to be variable. Washing the cells with 2 M phosphate-buffered saline removed completely 125I-bFGF bound to low-affinity binding sites but decreased also the high-affinity binding. The majority of the surface-bound 125I-bFGF was removed by washing the cells with acetic acid buffer at pH 3. At 37 degrees C, 30% of the cell-associated 125I-bFGF became resistant to the acidic wash after 90 min, suggesting that this fraction of bound 125I-bFGF was internalized. At this temperature, degradation of the internalized ligand was followed after 1 h by the appearance of three major bands of 15,000, 10,000, and 8,000 Da and was inhibited by chloroquine. These results demonstrated two classes of binding sites for bFGF in HOME cells; the number of high-affinity binding sites being larger than the number reported for bovine capillary endothelial cells. The intracellular processing of bFGF in HOME cells seems to be different from that of heparin binding growth factor-1 in murine lung capillary endothelial cells and of eye-derived growth factor-1 in Chinese hamster fibroblasts.</div>
</front>
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<Month>04</Month>
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<DateRevised><Year>2019</Year>
<Month>07</Month>
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<Article PubModel="Print"><Journal><ISSN IssnType="Print">0014-4827</ISSN>
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<Issue>1</Issue>
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<Title>Experimental cell research</Title>
<ISOAbbreviation>Exp. Cell Res.</ISOAbbreviation>
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<ArticleTitle>Binding, internalization, and degradation of basic fibroblast growth factor in human microvascular endothelial cells.</ArticleTitle>
<Pagination><MedlinePgn>75-84</MedlinePgn>
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<Abstract><AbstractText>The binding, internalization, and degradation of basic fibroblast growth factor (bFGF) in human omental microvascular endothelial cells (HOME cells) were investigated. Binding studies of bFGF in human endothelial cells have not yet been reported. Basic FGF bound to HOME cells (KD of 42.0 +/- 3.8 pM and 70,526 +/- 6121 binding sites/cell for the high-affinity sites, KD of 0.933 +/- 0.27 nM and 630,252 +/- 172,459 sites/cell for low-affinity binding sites). The number of low-affinity binding sites was found to be variable. Washing the cells with 2 M phosphate-buffered saline removed completely 125I-bFGF bound to low-affinity binding sites but decreased also the high-affinity binding. The majority of the surface-bound 125I-bFGF was removed by washing the cells with acetic acid buffer at pH 3. At 37 degrees C, 30% of the cell-associated 125I-bFGF became resistant to the acidic wash after 90 min, suggesting that this fraction of bound 125I-bFGF was internalized. At this temperature, degradation of the internalized ligand was followed after 1 h by the appearance of three major bands of 15,000, 10,000, and 8,000 Da and was inhibited by chloroquine. These results demonstrated two classes of binding sites for bFGF in HOME cells; the number of high-affinity binding sites being larger than the number reported for bovine capillary endothelial cells. The intracellular processing of bFGF in HOME cells seems to be different from that of heparin binding growth factor-1 in murine lung capillary endothelial cells and of eye-derived growth factor-1 in Chinese hamster fibroblasts.</AbstractText>
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<MeshHeading><DescriptorName UI="D006863" MajorTopicYN="N">Hydrogen-Ion Concentration</DescriptorName>
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<MeshHeading><DescriptorName UI="D008970" MajorTopicYN="N">Molecular Weight</DescriptorName>
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Binding, internalization, and degradation of basic fibroblast growth factor in human microvascular endothelial cells.

Binding, internalization, and degradation of basic fibroblast growth factor in human microvascular endothelial cells.

Source :

English descriptors

Abstract

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