Intracellular degradation of type I collagen and fibronectin in human lung fibroblasts: evidence against degradation in pre-lysosomal compartments.
Identifieur interne : 002A72 ( Main/Exploration ); précédent : 002A71; suivant : 002A73Intracellular degradation of type I collagen and fibronectin in human lung fibroblasts: evidence against degradation in pre-lysosomal compartments.
Auteurs : L M Andersson [Royaume-Uni] ; M J WarburtonSource :
- Biochimica et biophysica acta [ 0006-3002 ] ; 1995.
Descripteurs français
- KwdFr :
- 2,2'-Bipyridine (pharmacologie), Appareil de Golgi (), Bréfeldine A, Canavanine (pharmacologie), Chloroquine (pharmacologie), Collagène (), Collagène (métabolisme), Cyclopentanes (pharmacologie), Fibroblastes (), Fibroblastes (métabolisme), Fibronectines (métabolisme), Guanosine 5'-O-(3-thiotriphosphate) (pharmacologie), Humains, Hydroxybenzoates (pharmacologie), Inhibiteurs de la cystéine protéinase (pharmacologie), Inhibiteurs de la synthèse protéique (pharmacologie), Lignée cellulaire, Monensin (pharmacologie), Organites (métabolisme), Perméabilité de la membrane cellulaire, Pliage des protéines, Poumon (cytologie), Poumon (métabolisme), Réticulum endoplasmique (), Transport biologique ().
- MESH :
- cytologie : Poumon.
- métabolisme : Collagène, Fibroblastes, Fibronectines, Organites, Poumon.
- pharmacologie : 2,2'-Bipyridine, Canavanine, Chloroquine, Cyclopentanes, Guanosine 5'-O-(3-thiotriphosphate), Hydroxybenzoates, Inhibiteurs de la cystéine protéinase, Inhibiteurs de la synthèse protéique, Monensin.
- Appareil de Golgi, Bréfeldine A, Collagène, Fibroblastes, Humains, Lignée cellulaire, Perméabilité de la membrane cellulaire, Pliage des protéines, Réticulum endoplasmique, Transport biologique.
English descriptors
- KwdEn :
- 2,2'-Dipyridyl (pharmacology), Biological Transport (drug effects), Brefeldin A, Canavanine (pharmacology), Cell Line, Cell Membrane Permeability, Chloroquine (pharmacology), Collagen (chemistry), Collagen (metabolism), Cyclopentanes (pharmacology), Cysteine Proteinase Inhibitors (pharmacology), Endoplasmic Reticulum (drug effects), Fibroblasts (drug effects), Fibroblasts (metabolism), Fibronectins (metabolism), Golgi Apparatus (drug effects), Guanosine 5'-O-(3-Thiotriphosphate) (pharmacology), Humans, Hydroxybenzoates (pharmacology), Lung (cytology), Lung (metabolism), Monensin (pharmacology), Organelles (metabolism), Protein Folding, Protein Synthesis Inhibitors (pharmacology).
- MESH :
- chemical , chemistry : Collagen.
- chemical , metabolism : Collagen, Fibronectins.
- chemical , pharmacology : 2,2'-Dipyridyl, Canavanine, Chloroquine, Cyclopentanes, Cysteine Proteinase Inhibitors, Guanosine 5'-O-(3-Thiotriphosphate), Hydroxybenzoates, Monensin, Protein Synthesis Inhibitors.
- cytology : Lung.
- drug effects : Biological Transport, Endoplasmic Reticulum, Fibroblasts, Golgi Apparatus.
- metabolism : Fibroblasts, Lung, Organelles.
- chemical : Brefeldin A, Cell Line, Cell Membrane Permeability, Humans, Protein Folding.
Abstract
Fibroblasts degrade about 15% of newly synthesised collagen within the cell before it can be secreted. When the helical structure of collagen is disrupted, about 30% is degraded intracellularly. To determine if collagen degradation occurs in a pre-lysosomal compartment, the passage of type 1 collagen out of the endoplasmic reticulum or Golgi was inhibited by incubating human lung fibroblasts with brefeldin A or monensin. In both cases, the type I collagen retained within the cell was stable over a 20 h period. Disrupting the helical structure of collagen with cis-hydroxyproline, 2,2'-bipyridyl or ethyl 3,4-dihydroxybenzoate did not alter the stability of type I collagen in brefeldin or monensin-treated cells. Incubating permeabilised cells in the presence of GTP gamma S (guanosine 5'-(3-O-thio)triphosphate), which blocks transport out of the endoplasmic reticulum, also resulted in the stable retention of type I collagen. Addition of dithiothreitol to permeabilised cells failed to initiate intracellular degradation. Similar results were obtained with fibronectin. Both normal fibronectin and fibronectin in which canavanine replaced arginine were stable for 20 h in cells treated with brefeldin A or monensin. The degradation of native collagen is sensitive to inhibition by a cell-permeable cysteine proteinase inhibitor (ALLN) but is insensitive to chloroquine (which raises the pH of acidic intracellular compartments), whereas the degradation of abnormal collagen was sensitive to both ALLN and chloroquine. These results argue against the intracellular degradation of collagen or fibronectin in a pre-lysosomal compartment.
DOI: 10.1016/0167-4889(95)00038-t
PubMed: 7626659
Affiliations:
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Le document en format XML
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uniqKey="Warburton M" first="M J" last="Warburton">M J Warburton</name></author></analytic><series><title level="j">Biochimica et biophysica acta</title><idno type="ISSN">0006-3002</idno><imprint><date when="1995" type="published">1995</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>2,2'-Dipyridyl (pharmacology)</term><term>Biological Transport (drug effects)</term><term>Brefeldin A</term><term>Canavanine (pharmacology)</term><term>Cell Line</term><term>Cell Membrane Permeability</term><term>Chloroquine (pharmacology)</term><term>Collagen (chemistry)</term><term>Collagen (metabolism)</term><term>Cyclopentanes (pharmacology)</term><term>Cysteine Proteinase Inhibitors (pharmacology)</term><term>Endoplasmic Reticulum (drug effects)</term><term>Fibroblasts (drug effects)</term><term>Fibroblasts (metabolism)</term><term>Fibronectins (metabolism)</term><term>Golgi Apparatus (drug effects)</term><term>Guanosine 5'-O-(3-Thiotriphosphate) (pharmacology)</term><term>Humans</term><term>Hydroxybenzoates (pharmacology)</term><term>Lung (cytology)</term><term>Lung (metabolism)</term><term>Monensin (pharmacology)</term><term>Organelles (metabolism)</term><term>Protein Folding</term><term>Protein Synthesis Inhibitors (pharmacology)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>2,2'-Bipyridine (pharmacologie)</term><term>Appareil de Golgi ()</term><term>Bréfeldine A</term><term>Canavanine (pharmacologie)</term><term>Chloroquine (pharmacologie)</term><term>Collagène ()</term><term>Collagène (métabolisme)</term><term>Cyclopentanes (pharmacologie)</term><term>Fibroblastes ()</term><term>Fibroblastes (métabolisme)</term><term>Fibronectines (métabolisme)</term><term>Guanosine 5'-O-(3-thiotriphosphate) (pharmacologie)</term><term>Humains</term><term>Hydroxybenzoates (pharmacologie)</term><term>Inhibiteurs de la cystéine protéinase (pharmacologie)</term><term>Inhibiteurs de la synthèse protéique (pharmacologie)</term><term>Lignée cellulaire</term><term>Monensin (pharmacologie)</term><term>Organites (métabolisme)</term><term>Perméabilité de la membrane cellulaire</term><term>Pliage des protéines</term><term>Poumon (cytologie)</term><term>Poumon (métabolisme)</term><term>Réticulum endoplasmique ()</term><term>Transport biologique ()</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Collagen</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Collagen</term><term>Fibronectins</term></keywords><keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>2,2'-Dipyridyl</term><term>Canavanine</term><term>Chloroquine</term><term>Cyclopentanes</term><term>Cysteine Proteinase Inhibitors</term><term>Guanosine 5'-O-(3-Thiotriphosphate)</term><term>Hydroxybenzoates</term><term>Monensin</term><term>Protein Synthesis Inhibitors</term></keywords><keywords scheme="MESH" qualifier="cytologie" xml:lang="fr"><term>Poumon</term></keywords><keywords scheme="MESH" qualifier="cytology" xml:lang="en"><term>Lung</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Biological Transport</term><term>Endoplasmic Reticulum</term><term>Fibroblasts</term><term>Golgi Apparatus</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Fibroblasts</term><term>Lung</term><term>Organelles</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Collagène</term><term>Fibroblastes</term><term>Fibronectines</term><term>Organites</term><term>Poumon</term></keywords><keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>2,2'-Bipyridine</term><term>Canavanine</term><term>Chloroquine</term><term>Cyclopentanes</term><term>Guanosine 5'-O-(3-thiotriphosphate)</term><term>Hydroxybenzoates</term><term>Inhibiteurs de la cystéine protéinase</term><term>Inhibiteurs de la synthèse protéique</term><term>Monensin</term></keywords><keywords scheme="MESH" type="chemical" xml:lang="en"><term>Brefeldin A</term><term>Cell Line</term><term>Cell Membrane Permeability</term><term>Humans</term><term>Protein Folding</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Appareil de Golgi</term><term>Bréfeldine A</term><term>Collagène</term><term>Fibroblastes</term><term>Humains</term><term>Lignée cellulaire</term><term>Perméabilité de la membrane cellulaire</term><term>Pliage des protéines</term><term>Réticulum endoplasmique</term><term>Transport biologique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Fibroblasts degrade about 15% of newly synthesised collagen within the cell before it can be secreted. When the helical structure of collagen is disrupted, about 30% is degraded intracellularly. To determine if collagen degradation occurs in a pre-lysosomal compartment, the passage of type 1 collagen out of the endoplasmic reticulum or Golgi was inhibited by incubating human lung fibroblasts with brefeldin A or monensin. In both cases, the type I collagen retained within the cell was stable over a 20 h period. Disrupting the helical structure of collagen with cis-hydroxyproline, 2,2'-bipyridyl or ethyl 3,4-dihydroxybenzoate did not alter the stability of type I collagen in brefeldin or monensin-treated cells. Incubating permeabilised cells in the presence of GTP gamma S (guanosine 5'-(3-O-thio)triphosphate), which blocks transport out of the endoplasmic reticulum, also resulted in the stable retention of type I collagen. Addition of dithiothreitol to permeabilised cells failed to initiate intracellular degradation. Similar results were obtained with fibronectin. Both normal fibronectin and fibronectin in which canavanine replaced arginine were stable for 20 h in cells treated with brefeldin A or monensin. The degradation of native collagen is sensitive to inhibition by a cell-permeable cysteine proteinase inhibitor (ALLN) but is insensitive to chloroquine (which raises the pH of acidic intracellular compartments), whereas the degradation of abnormal collagen was sensitive to both ALLN and chloroquine. These results argue against the intracellular degradation of collagen or fibronectin in a pre-lysosomal compartment.</div></front></TEI><affiliations><list><country><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Grand Londres</li></region><settlement><li>Londres</li></settlement></list><tree><noCountry><name sortKey="Warburton, M J" sort="Warburton, M J" uniqKey="Warburton M" first="M J" last="Warburton">M J Warburton</name></noCountry><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Andersson, L M" sort="Andersson, L M" uniqKey="Andersson L" first="L M" last="Andersson">L M Andersson</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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