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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Levesque, J. P. Hatzfeld, J. Hatzfeld, A. |
| Abstract | The possibility that the mitogenic effect of fibrinogen, a major plasma protein (3 mg/ml), is mediated by specific membrane receptors was studied. Specific binding analysis showed that fibrinogen receptors are present only on hemopoietic cell lines that respond to its mitogenic effect. The mitogenic fibrinogen receptor is not recognized by antibodies specific for the platelet fibrinogen receptor or is not competitively blocked by synthetic peptides containing the Arg-Gly-Asp sequence, which is common to fibronectin, fibrinogen, vitronectin, and other cell-attachment proteins. The lymphoma-derived pre-B-cells (Raji) have 149,000 receptors, whereas the lymphoma-derived T cells (JM), which are 3 times smaller, have 54,000 receptors. These receptors have a Kd of 2 X 10(-7) M. They are inducible by stimuli specific for the cell lineage: activators of the breakdown of phosphatidylinositol phosphates, such as platelet activating factor for Raji cells, and adenylate cyclase agonists and cAMP analogues for JM cells. The stimuli have no mitogenic effect in the absence of fibrinogen; they do not change the Kd. Each stimulus increases the number of fibrinogen receptors in a dose-dependent manner, which correlates strongly (r = -0.98, n = 5) with an increased growth rate of cells in the presence of fibrinogen. This correlation concludes that the mitogenic effect of fibrinogen is controlled via receptor modulation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 83 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1986-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Fibrinogen Pharmacology Hematopoietic Stem Cells Cytology Mitogens Receptors, Cell Surface Metabolism Adenosine Diphosphate Binding Sites Binding, Competitive Blood Platelets Physiology Bucladesine Cell Line Edetic Acid Drug Effects Platelet Activating Factor Platelet Membrane Glycoproteins Thrombin Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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