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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Witte, L. D. Cornicelli, J. A. |
| Abstract | Human platelets contain a mitogen, the platelet-derived growth factor (PDGF), that stimulates the proliferation of a variety of cell types in culture and that may play a role in atherogenesis. Studies were conducted to explore the effects of PDGF on low density lipoprotein (LDL) receptor activity of cultured human fibroblasts. The PDGF utilized in these studies was partially purified from human platelet-rich plama by ion exchange chromatography and gel filtration. LDL receptor activity was assessed by both specific binding of 125I-labeled LDL to the fibroblast's surface at 4 degrees C, and the incorporation of [14C]oleate into cholesteryl esters. Exposure of normal human fibroblasts to increasing amounts of PDGF (0.1-10 microgram/ml) for 48 hr caused a dose-related increase in 125I-labeled LDL binding to a maximum of approximately 300%. In the presence of added LDL, this increase in LDL binding was not seen. Cholesterol esterifiction was also stimulated following a 48-hr exposure to PDGF. Following a conditioning period in LDL- and PDGF-depleted medium, cholesterol esterification was greatly increased during a 48-hr exposure to LDL alone; a smaller but significant increase occurred with PDGF alone. However, both PDGF and LDL were required to return the level of esterification to that observed with whole human serum. Fibroblasts from a patient with homozygous familial hypercholesterolemia, which lack the LDL receptor, also showed a significant increase in cholesteol esterification with PDGF alone, whereas LDL had no effect. These studies demonstrate that PDGF can stimulate the LDL receptor activity in cultured human fibroblasts. The effect on other related activities of the LDL receptor system and the mechanism involved remain to be defined. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 10 |
| Volume Number | 77 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1980-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Blood Platelets Physiology Growth Substances Pharmacology Lipoproteins, LDL Metabolism Peptides Receptors, Cell Surface Cells, Cultured Cholesterol Esters Biosynthesis Dose-Response Relationship, Drug Mitogens Platelet-Derived Growth Factor Receptors, LDL Stimulation, Chemical Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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