51
|
Wang Y, Pratt JR, Tam FW, Hartley B, Wolff JA, Olavesen MG, Sacks SH. Up-regulation of type 1 plasminogen activator inhibitor messenger RNA with thrombotic changes in renal grafts. Transplantation 1996; 61:684-9. [PMID: 8607167 DOI: 10.1097/00007890-199603150-00002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Small vessel thrombosis is a prominent feature in kidneys undergoing vascular rejection. Type I and type 2 plasminogen activator inhibitors (PAI-1 and PAI-2, respectively) are known to mediate thrombosis. To examine the potential role of PAI-1 and PAI-2 in the mediation of vascular injury, the relationship and the time course of gene expression of PAI-1 and PAI-2 with the thrombotic changes in renal grafts were investigated in an unmodified rejection model in rats. Orthotopic renal transplantation was performed from Lewis to dark agouti (DA) rats and from DA to DA isografts; untreated normal rat kidneys were used as controls. The rats were killed on days 1-9 posttransplantation (n=18 in each allograft and isograft group). The grafts were analyzed by histopathology, in situ mRNA hybridization and Northern blot methods. The results show that PAM mRNA was first detected at day 4, when the thrombotic changes in the grafts were first seen, and that this relationship persisted during the time course observed to day 9. There was no detectable PAI-1 mRNA in the control groups and no PAI-2 in either group. In situ hybridization showed that PAI-1 positive cells were predominantly located in the cortical interstitium, consistent with the distribution of interstitial microthrombi. These results provide experimental evidence that the thrombotic changes in rejecting allografts are associated with the up-regulation of PAI-1 in the donor tissue, whereas PAI-2, from our results, does not seem to influence these changes. The data are consistent with a role for PAI-1 in the pathogenesis of vascular rejection.
Collapse
Affiliation(s)
- Y Wang
- Histopathology Department, Paediatric Research Unit, United Medical and Dental School of Guy's and St. Thomas' Hospital, Guy's Campus, London, United Kingdom
| | | | | | | | | | | | | |
Collapse
|
52
|
|
53
|
Lopez-Segura F, Velasco F, Lopez-Miranda J, Castro P, Lopez-Pedrera R, Blanco A, Jimenez-Pereperez J, Torres A, Trujillo J, Ordovas JM, Pérez-Jiménez F. Monounsaturated fatty acid-enriched diet decreases plasma plasminogen activator inhibitor type 1. Arterioscler Thromb Vasc Biol 1996; 16:82-8. [PMID: 8548431 DOI: 10.1161/01.atv.16.1.82] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
An increase in levels of plasma plasminogen activator inhibitor type 1 (PAI-1) is one of the main hemostatic alterations in patients with coronary heart disease. Despite growing interest in the fibrinolytic system, few studies have been undertaken to determine the effect exerted on it by the different dietary fatty acids. We investigated the effect of a monounsaturated fat (MUFA)-rich diet in comparison with a low-fat diet (National Cholesterol Education Program step 1 diet) (NCEP-1) on factors involved in blood coagulation and fibrinolysis. We also determined the effect of dietary cholesterol on these blood parameters. Twenty-one young, male, healthy volunteers followed two low-fat/high-carbohydrate diets (< 30% fat, < 10% saturated fat, 14% MUFA) for 24 days each, with 115 or 280 mg of cholesterol per 1000 kcal per day, and two oleic acid-enriched diets (38% fat, 24% MUFA) with the same dietary cholesterol as the low-fat/high-carbohydrate diets. Plasma levels of fibrinogen, thrombin-antithrombin complexes, prothrombin fragments 1+2, plasminogen, alpha 2 antiplasmin, and tissue plasminogen activator were not significantly different among the experimental diets used in this study. Consumption of the diet rich in MUFA resulted in a significant decrease in both PAI-1 plasma activity (P < .005) and antigenic PAI-1 (P < .04) compared with the carbohydrate-rich diet (NCEP-1). The addition of dietary cholesterol to each of these diets did not result in any significant additional effect. Changes in insulin levels and PAI-1 activity were positively correlated (r = .425; P < .02). In conclusion, consumption of diets rich in MUFAs decreases PAI-1 plasma activity, which is accompanied by a parallel decrease in plasma insulin levels.
Collapse
Affiliation(s)
- F Lopez-Segura
- Unidad de Lípidos y Arteriosclerosis, Hospital Universitario Reina Sofia, Córdoba, Spain
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
54
|
Okada K, Yuasa H, Hagiya Y, Takaishi T, Fukao H, Ueshima S, Matsuo O. Fibrinolytic activity in liver tissues of stroke-prone spontaneously hypertensive rats. CLINICAL AND EXPERIMENTAL PHARMACOLOGY & PHYSIOLOGY. SUPPLEMENT 1995; 22:S275-6. [PMID: 9072388 DOI: 10.1111/j.1440-1681.1995.tb02914.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
1. Plasminogen activator activity was detected in the extract solution of the liver tissues of both stroke-prone spontaneously hypertensive rats (SHRSP) and Wistar-Kyoto (WKY) rats by the synthetic substrate assay. 2. The total PA activity in the liver extract of WKY (26.8 +/- 8.3 i.u.) was about 1.5-fold higher than that of SHRSP (18.5 +/- 4.1 i.u., n = 8, P < 0.005). 3. The enzymography of the liver extract revealed three lytic bands with a molecular weight of 67 kDa, 44 kDa and 38 kDa. 4. The inhibitor activity of the liver extract was detected by the reverse fibrin autography method with one lytic resistance band at 70 kDa. 5. Thus, fibrinolytic components exist in the liver tissue of both strains of rats, but their contribution to the stroke requires further study.
Collapse
Affiliation(s)
- K Okada
- Department of Physiology, Kinki University School of Medicine, Osakasayama, Japan
| | | | | | | | | | | | | |
Collapse
|
55
|
Abstract
Acute coronary events result from the rupture of an atherosclerotic plaque, leading to formation of an occlusive coronary thrombus. Recent developments in the field of gene transfer provide the opportunity to genetically modify cells involved in plaque rupture as well as thrombus formation and thus prevent acute coronary syndromes. A first approach consists of transferring genes, the product of which may stabilize the vulnerable plaque by reducing the plaque content in lipids and macrophages. Alternatively, the introduction into the atherosclerotic plaque of genes encoding for thrombolytic proteins or growth factors able to restore physiologic antithrombotic functions of endothelial cells may inhibit thrombus formation should the plaque rupture. The success of such strategies depends on the efficiency with which the transgene is introduced and expressed into the target cell, the duration of transgene expression and the ability of the transgene product to ultimately prevent plaque rupture or thrombus formation, or both.
Collapse
Affiliation(s)
- L J Feldman
- Department of Medicine (Cardiology), St. Elizabeth's Medical Center, Boston, Massachusetts 02135, USA
| | | |
Collapse
|
56
|
Yamashita M, Darlington DN, Weeks EJ, Jones RO, Gann DS. Plasminogen activator inhibitor-1 rises after hemorrhage in rats. THE AMERICAN JOURNAL OF PHYSIOLOGY 1995; 268:E1065-9. [PMID: 7611379 DOI: 10.1152/ajpendo.1995.268.6.e1065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Large hemorrhage leads to hypercoagulability, a phenomenon that has never been well explained. Because an elevation of plasminogen activator inhibitor (PAI)-1 increases procoagulant activity, we have determined whether plasma PAI activity and tissue PAI-1 mRNA are elevated after hemorrhage. Sprague-Dawley rats were bled (20 or 15 ml/kg) 4 days after cannulation. Plasma PAI activity was determined by the capacity of plasma to inhibit tissue-type plasminogen activator activity. Changes of PAI-1 mRNA in various tissues were detected by high-performance liquid chromatography after reverse transcription and polymerase chain reaction. Hemorrhage (20 ml/kg) significantly elevated plasma PAI activity at 0.5, 1, 2, 4, 6, and 8 h after hemorrhage and PAI-1 mRNA in liver at 1, 2, 4, and 6 h after hemorrhage. The PAI-1 message was also significantly elevated in lung, heart, and kidney at 4 h after hemorrhage. The increases of PAI-1 mRNA after 20 ml/kg hemorrhage were significantly greater than those after 15 ml/kg hemorrhage. These findings indicate that large hemorrhage can induce the increases in PAI activity and PAI-1 message and suggest that induction of PAI-1 may be involved in the thrombogenic responses observed after large hemorrhage.
Collapse
Affiliation(s)
- M Yamashita
- Department of Surgery, University of Maryland School of Medicine, Baltimore 21201, USA
| | | | | | | | | |
Collapse
|
57
|
MacGregor RR, Klein RM, Bansal DD. Secretion of plasminogen activator activity from neonatal rat heart cells is regulated by hormones and growth factors. Ann N Y Acad Sci 1995; 752:331-42. [PMID: 7755278 DOI: 10.1111/j.1749-6632.1995.tb17442.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- R R MacGregor
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City 66160, USA
| | | | | |
Collapse
|
58
|
Thornton A, Gelehrter T. Human hepatocytes express the gene for type 1 plasminogen activator-inhibitor (PAI-1) in vivo. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/s0268-9499(08)80041-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
59
|
Abstract
Hepatic fibrosis occurs as a consequence of net accumulation of matrix proteins (particularly collagen types I and III) in liver. Current concepts of the pathogenesis of liver fibrosis place major emphasis on the activation of hepatic lipocytes (fat-storing or Ito cells) to a myofibroblast-like phenotype with a consequent increase in their synthesis of matrix proteins. While this is an important factor, there is increasing evidence to indicate that liver fibrosis is a dynamic pathologic process in which altered matrix degradation may also play a significant role. Extracellular degradation of matrix proteins is regulated by a family of enzymes called the matrix metalloproteinases, which is subdivided into three groups; collagenases which degrade interstitial collagens (types I, II and III), type IV collagenases/gelatinases which degrade basement membrane (type IV) collagen and gelatins and stromelysins which degrade a broad range of substrates including proteoglycans, laminin, gelatins and fibronectin. The extracellular activity of these enzymes is regulated by several mechanisms which include alterations in gene transcription and proenzyme synthesis, cleavage of secreted proenzymes to active forms, and specific inhibition of activated forms by tissue inhibitor(s) of metalloproteinases (TIMPs). In liver, current evidence indicates that activated hepatic lipocytes and Kupffer cells play a central role in synthesis of matrix metalloproteinases. Under defined conditions they synthesize interstitial collagenase, 72 kDa and 95 kDa type IV collagenase/gelatinase and possibly stromelysin. Moreover, lipocytes also contribute to regulation of the extracellular activity of these enzymes by secretion of TIMP-1 and alpha 2-macroglobulin.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- M J Arthur
- University Medicine, University of Southampton, UK
| |
Collapse
|
60
|
Moestrup SK, Christensen EI, Nielsen S, Jørgensen KE, Bjørn SE, Røigaard H, Gliemann J. Binding and endocytosis of proteins mediated by epithelial gp330. Ann N Y Acad Sci 1994; 737:124-37. [PMID: 7524393 DOI: 10.1111/j.1749-6632.1994.tb44306.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- S K Moestrup
- Department of Medical Biochemistry, University of Aarhus, Denmark
| | | | | | | | | | | | | |
Collapse
|
61
|
Padró T, Quax PH, van den Hoogen CM, Roholl P, Verheijen JH, Emeis JJ. Tissue-type plasminogen activator and its inhibitor in rat aorta. Effect of endotoxin. ARTERIOSCLEROSIS AND THROMBOSIS : A JOURNAL OF VASCULAR BIOLOGY 1994; 14:1459-65. [PMID: 8068608 DOI: 10.1161/01.atv.14.9.1459] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Plasminogen activator (PA) and PA inhibitor (PAI) antigen, activity, and mRNA were analyzed in the three layers of rat aorta, and the effect of endotoxin on PA and PAI was studied. All PA activity in aorta was identified as tissue-type PA (TPA) activity; no urokinase-type PA was detected. In the tunica adventitia TPA activity, TPA antigen, and TPA mRNA were detected, whereas in the tunica media TPA antigen and TPA mRNA, but no TPA activity, were found. PAI activity was detected in the tunica media, explaining the absence of TPA activity in this layer. Removal of the endothelial cells had no effect on TPA antigen and PAI activity in intima-media preparations. Also, similar amounts of PAI-1 mRNA were found in intima-media preparations, irrespective of the presence or absence of the intima. Immunohistochemical staining showed that TPA immunoreactivity was present in all three layers of the aorta, whereas PAI-1 immunoreactivity was found in medial smooth muscle cells but not in endothelial cells. After endotoxin treatment, TPA activity was decreased in extracts of the total aorta and of the adventitia, although TPA antigen and TPA mRNA were unchanged. PAI-1 mRNA was strongly increased in the tunica adventitia and in the tunica media, as was PAI activity in the tunica media. Thus, endotoxin decreased TPA activity by increasing the synthesis of PAI-1; TPA was unaffected. Our observations in rat aorta differ from observations in mouse aorta and in rat carotid artery, and they caution against extrapolation from one tissue (or species) to another.
Collapse
Affiliation(s)
- T Padró
- Gaubius Laboratory TNO-PG, Leiden, Netherlands
| | | | | | | | | | | |
Collapse
|
62
|
Healy A, Gelehrter T. Induction of plasminogen activator inhibitor-1 in HepG2 human hepatoma cells by mediators of the acute phase response. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32279-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
63
|
van Leeuwen RT, Kol A, Andreotti F, Kluft C, Maseri A, Sperti G. Angiotensin II increases plasminogen activator inhibitor type 1 and tissue-type plasminogen activator messenger RNA in cultured rat aortic smooth muscle cells. Circulation 1994; 90:362-8. [PMID: 8026020 DOI: 10.1161/01.cir.90.1.362] [Citation(s) in RCA: 114] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND The role of angiotensin as a vasoconstrictor is well established. Lately, several other actions of this hormone on vascular smooth muscle (VSM) cells have been recognized including the induction of hypertrophy and/or DNA synthesis. Platelet-derived growth factor (PDGF), a mitogen recently shown to increase plasminogen activator inhibitor type 1 (PAI-1) synthesis in VSM cells, shares with angiotensin II (Ang II) several steps of its intracellular signaling pathway. METHODS AND RESULTS The expression of PAI-1 and tissue-type plasminogen activator (TPA) mRNA in cultured rat VSM cells was studied. Northern blot analysis demonstrated a severalfold increase in the PAI-1 mRNA 3 to 8 hours after stimulation with 300 nmol/L Ang II. A similar response for TPA mRNA was observed. This induction did not require the synthesis of an intermediate protein or peptide because it was not affected by cycloheximide. In the cell-conditioned supernatant, the net result was an increase in PAI-1 activity from 4.18 +/- 1.8 to 13.2 +/- 6.8 IU/mL 6 hours after the addition of 300 nmol/L Ang II (mean +/- SD, P < or = .008, n = 6). The Ang II-induced increase in PAI activity was dose related, with a maximal effect at a concentration of 23 nmol/L (n = 3) and an ED50 of 3.3 +/- 1.5 nmol/L (n = 3). [Sar1-Ile8]angiotensin II, a specific competitive antagonist of Ang II, blocked 90 +/- 9% (n = 3) of the PAI activity induced by 10 nmol/L Ang II. In basal conditions, fibrin overlay zymography demonstrated the presence of free TPA. After stimulation with Ang II, lysis caused by the in situ dissociation of TPA was also present in the region of the TPA/PAI-1 complex. Angiotensin I (Ang I) elicited an increase in PAI activity similar to that obtained with equivalent doses of Ang II. Captopril (5 micrograms/mL), an inhibitor of the angiotensin-converting enzyme (ACE), completely prevented the Ang I effect, demonstrating that VSM cells display an ACE-like activity. CONCLUSIONS Recent research has demonstrated the existence of a localized vascular renin-angiotensin system. The finding that Ang II can potentially modulate the plasminogen activation in the arterial wall has important biological and therapeutical implications for the evolution of arterial wall thrombi and the migration of cells through the vessel wall in the genesis of atherosclerotic lesions. We speculate that the reduction in thrombotic events observed in patients with a previous myocardial infarction and in high-renin, hypertensive patients treated with ACE inhibitors could be due at least in part to the decreased production of PAI-1 by VSM cells caused by these agents.
Collapse
Affiliation(s)
- R T van Leeuwen
- Istituto di Cardiologia, Università Cattolica Del Sacro Cuore, Rome, Italy
| | | | | | | | | | | |
Collapse
|
64
|
Moestrup SK. The alpha 2-macroglobulin receptor and epithelial glycoprotein-330: two giant receptors mediating endocytosis of multiple ligands. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1197:197-213. [PMID: 7518253 DOI: 10.1016/0304-4157(94)90005-1] [Citation(s) in RCA: 121] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- S K Moestrup
- Department of Medical Biochemistry, University of Aarhus, Denmark
| |
Collapse
|
65
|
Reilly JM, Sicard GA, Lucore CL. Abnormal expression of plasminogen activators in aortic aneurysmal and occlusive disease. J Vasc Surg 1994; 19:865-72. [PMID: 8170041 DOI: 10.1016/s0741-5214(94)70012-5] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
PURPOSE AND METHODS Aortic aneurysms are characterized by the destruction of the extracellular matrix of the media, whereas occlusive disease involves excess matrix accumulation within the intima. Plasmin degrades extracellular matrix directly and indirectly by activation of latent metalloenzymes. To determine the expression of tissue- and urokinase-type plasminogen activators, immunoassay, fibrin autography, Northern analysis, and immunohistochemistry were performed on specimens of aneurysmal (n = 12), occlusive (n = 8), and healthy (n = 6) aorta. RESULTS Immunoassay of tissue-type plasminogen activator revealed 8.7 +/- 0.9 ng tissue-type plasminogen activator/mg extracted protein in aneurysmal aorta, 5.7 +/- 0.3 ng/mg in normal aorta, and 2.5 +/- 0.3 ng/mg in occlusive aorta (p < 0.05 for comparisons between all groups). No urokinase-type plasminogen activator antigen was detected by urokinase-type plasminogen activator immunoassay. Fibrin autography exhibited lytic activity at 64 kDa and 54 kDa attributable to tissue-type plasminogen activator and urokinase-type plasminogen activator. The vast majority of fibrinolysis was secondary to free tissue-type plasminogen activator and was greatest in aneurysmal disease and least in occlusive disease. There was only a small amount of lysis secondary to urokinase-type plasminogen activator. Expression of tissue-type plasminogen activator and urokinase-type plasminogen activators mRNA was comparable in aneurysmal and occlusive aortas. In contrast to occlusive disease, aneurysms had an inflammatory cell infiltrate characterized by the expression of urokinase-type plasminogen activator by specific mononuclear cells. Tissue-type plasminogen activator expression was evident in the intima of normal and diseased aorta and in the media of diseased aorta. CONCLUSION Differential expression of plasminogen activators within the arterial wall may contribute to the unique pathogenesis of aneurysmal and occlusive aortic disease.
Collapse
Affiliation(s)
- J M Reilly
- Department of Surgery, Washington University School of Medicine, St. Louis, MO
| | | | | |
Collapse
|
66
|
Korbut R, Warner TD, Gryglewski RJ, Vane JR. The effect of nitric oxide synthase inhibition on the plasma fibrinolytic system in septic shock in rats. Br J Pharmacol 1994; 112:289-91. [PMID: 7518306 PMCID: PMC1910314 DOI: 10.1111/j.1476-5381.1994.tb13066.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
1. We have investigated the effect of pretreatment of rats with nitric oxide (NO) synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME) on the E. coli lipopolysaccharide (LPS)-induced changes in the plasma fibrinolytic system, platelet count, fibrinogen level, as well as in gross and microscopic pathophysiological changes indicative of disseminated intravascular coagulation (DIC) in rats. 2. E. coli LPS (6 mg kg-1, i.p.) produced a decrease in the levels of plasma fibrinogen and a drop in the blood platelet count 6 h after administration. The decrease in fibrinogen but not the drop in platelet count was reversed by pretreatment with L-NAME (30 mg kg-1, i.p., 24 h and 15 min before administration of LPS). 3. Pretreatment with L-NAME antagonized the LPS-induced activation of fibrinolysis as measured by changes in the euglobulin clot lysis time (ECLT) and enhanced the LPS-induced rise in the plasma level of plasminogen activator inhibitor (PAI). In animals pretreated with L-NAME there was also a marked reduction in the histological changes indicative of DIC. 4. We propose that L-NAME can act as a protective agent in LPS-induced DIC, and this protection is due to an increased generation of PAI following inhibition of NO synthase.
Collapse
Affiliation(s)
- R Korbut
- William Harvey Research Institute, Saint Bartholomew's Hospital Medical College, London
| | | | | | | |
Collapse
|
67
|
Loskutoff DJ, Sawdey M, Keeton M, Schneiderman J, Lang I, Schleef R. Analysis of PAI-1 gene expression in vivo using in situ hybridization. Ann N Y Acad Sci 1994; 714:259-64. [PMID: 8017776 DOI: 10.1111/j.1749-6632.1994.tb12052.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- D J Loskutoff
- Scripps Research Institute, Department of Vascular Biology, La Jolla, California 92037
| | | | | | | | | | | |
Collapse
|
68
|
Schneiderman J, Eguchi Y, Adar R, Sawdey M. Modulation of the fibrinolytic system by major peripheral ischemia. J Vasc Surg 1994; 19:516-24. [PMID: 8126866 DOI: 10.1016/s0741-5214(94)70080-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
PURPOSE A rat model was developed to investigate the effects of acute peripheral ischemia on the components of the fibrinolytic system. METHODS Laparotomy was performed and ischemia was introduced by total aortic clamping at a subrenal position. Control animals underwent sham laparotomy alone. Plasma and tissue samples were collected for analysis at 30, 60, 90, and 120 minutes after operation. RESULTS Functional assays of rat plasma revealed a dramatic and transient increase in tissue-type plasminogen activator (tPA) activity within 30 minutes of the onset of ischemia. A simultaneous decline in plasminogen activator inhibitor activity was observed. Immunohistochemical analysis suggested this initial increase in tPA activity resulted primarily from the release of stored tPA from ischemic vascular tissues. Northern blot analysis revealed that both tPA and plasminogen activator inhibitor-1 messenger RNA levels were elevated at 60 to 120 minutes in well-perfused tissues distant from the ischemic insult. CONCLUSIONS Collectively, these data demonstrate that acute peripheral ischemia results in a rapid and transient increase in plasma fibrinolytic activity, concomitant with the early release of stored tPA from ischemic vascular tissues. In addition, peripheral ischemia appears to stimulate both tPA and plasminogen activator inhibitor-1 gene expression in well-perfused tissues at later time points, consistent with the existence of humoral mediators.
Collapse
Affiliation(s)
- J Schneiderman
- Committee on Vascular Biology, Scripps Research Institute, La Jolla, CA
| | | | | | | |
Collapse
|
69
|
Moll S, Schifferli JA, Huarte J, Lemoine R, Vassalli JD, Sappino AP. LPS induces major changes in the extracellular proteolytic balance in the murine kidney. Kidney Int 1994; 45:500-8. [PMID: 8164438 DOI: 10.1038/ki.1994.65] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Recent investigations have shown that in the murine kidney urokinase (uPA) and tissue-type plasminogen activator (tPA) are synthesized and released in urine by tubular epithelial cells, raising the possibility that plasminogen activators (PAs) may be involved in the maintenance of patency and fluidity in renal tubules. To further investigate the contribution of the PA system in renal pathology, we have determined the effects of LPS on the renal production of PAs: we localized PA-catalyzed proteolysis by zymographic analysis of tissue sections and studied the accumulation of mRNAs for PAs and their inhibitors (PAI-1 and PAI-2) by in situ hybridization. Both a single and two injections of LPS induced a dramatic reduction in urinary and renal uPA enzymatic activity; this decrease in catalytic activity was attributable to a reduction in uPA mRNA levels in both proximal and distal tubules. By contrast, we noticed a marked increase of tPA mRNA content in glomerular cells which was not accompanied by a concomitant increase in tPA-mediated proteolytic activity. In addition, a major up-regulation in PAI-1 mRNA levels was observed throughout the kidney, while PAI-2 mRNA was not detectable in the kidneys of control or LPS-injected animals. Our investigations document the profound alterations of the PA/PAI balance in renal tissue following in vivo LPS administration. They suggest that imbalanced extracellular proteolysis might participate in the alterations of kidney function observed in septic shock.
Collapse
Affiliation(s)
- S Moll
- Department of Morphology, University of Geneva Medical School, Switzerland
| | | | | | | | | | | |
Collapse
|
70
|
|
71
|
Rieder H, Armbrust T, Meyer zum Büschenfelde KH, Ramadori G. Contribution of sinusoidal endothelial liver cells to liver fibrosis: expression of transforming growth factor-beta 1 receptors and modulation of plasmin-generating enzymes by transforming growth factor-beta 1. Hepatology 1993; 18:937-44. [PMID: 8406370 DOI: 10.1002/hep.1840180427] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Transforming growth factor-beta 1 is an important cytokine in the pathophysiology of liver fibrosis, stimulating the production of extracellular matrix. Whether this cytokine can also control the degradation of matrix proteins in liver cells has not been investigated. Because plasmin is an important protease for the degradation of matrix glycoproteins, we investigated whether sinusoidal endothelial liver cells could contribute to fibrosing liver disease through the modulation of plasmin-generating enzymes in response to transforming growth factor-beta 1. Sinusoidal endothelial cells from guinea pig liver were investigated in pure monolayer culture. Using 125I-labelled transforming growth factor-beta, we demonstrated high-affinity binding sites on sinusoidal endothelial cells at a density of 9.3 x 10(2) per cell, and a dissociation constant of about 5.5 x 10(-11) mol/L. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed the known three classes of membrane receptors for transforming growth factor-beta. Using biosynthetic labeling of proteins with 35S-methionine, immunoprecipitation and sodium dodecyl sulfate-polyacrylamide gel electrophoresis, we showed that sinusoidal endothelial cells produce and secrete plasminogen activator inhibitor type 1 from the beginning of culture. Treatment of confluent cell cultures for 24 hr with transforming growth factor-beta 1 increased synthesis and release of plasminogen activator inhibitor type 1. The response was almost maximal at a concentration of 1 ng transforming growth factor-beta/ml and paralleled the increased synthesis of fibronectin. On reverse fibrin autography we proved that transforming growth factor-beta 1 stimulated the release of functionally active plasminogen activator inhibitor type 1.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- H Rieder
- I. Medizinische Klinik und Poliklinik, Johannes-Gutenberg Universität Mainz, Germany
| | | | | | | |
Collapse
|
72
|
Abstract
The dissolution by the fibrinolytic agent saruplase of microthrombi due to disseminated intravascular coagulation (DIC) has been studied in anesthetized rats. The intravenous infusion of E. coli lipopolysaccharide (endotoxin) for 4 hours (total dose: 25 mg/kg) induced marked thrombocytopenia and hypofibrinogenemia. DIC-related microthrombosis, detected as increased deposition of 125I-labelled human fibrin, was found in the liver and the kidneys, but not in the lungs, the heart, the mesenterium, the spleen and the M. rectus abdominis of endotoxemic rats. Treatment with 1-20 micrograms/kg.min saruplase, that was infused concomitantly with endotoxin, dose-dependently and significantly reduced endotoxin-induced microthrombosis in the liver and the kidneys by 85 resp. 88%. When saruplase (20 micrograms/kg.min) was administered only during the last two hours of endotoxin infusion, liver microthrombosis was still significantly dissolved by 69%, whereas renal microthrombosis was insignificantly reduced by 34%. The inhibition of endotoxin-induced microthrombosis took place in the same dosage range as the shortening of the euglobulin clot lysis time in normal rats by saruplase as a measure of its fibrinolytic activity. Saruplase did not modify thrombocytopenia and hypofibrinogenemia in endotoxemic rats. Saruplase per se did not affect plasma fibrinogen levels. Thus, in a fibrin-selective dose range saruplase is able to dissolve microthrombosis associated with DIC in endotoxemic rats.
Collapse
Affiliation(s)
- J Schneider
- Grünenthal GmbH, Center of Research, Aachen, FRG
| |
Collapse
|
73
|
Boxman I, Löwik C, Aarden L, Ponec M. Modulation of IL-6 production and IL-1 activity by keratinocyte-fibroblast interaction. J Invest Dermatol 1993; 101:316-24. [PMID: 8370968 DOI: 10.1111/1523-1747.ep12365474] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The present study was undertaken to investigate whether modulation of interleukin-6 and interleukin-1 production occurs owing to keratinocyte-fibroblast interaction. Normal human keratinocytes or squamous carcinoma cells were cultured either alone or in the presence of human foreskin fibroblasts or murine 3T3 cells. All cells tested produced interleukin-6, and interleukin-6 levels were markedly increased when normal or malignant keratinocytes were co-cultured with fibroblasts. The bioassay (species independent) and enzyme-linked immunosorbent assay (specific for human interleukin-6) together with use of complementary DNA probes specific for human or murine interleukin-6 revealed that fibroblasts are responsible for increased interleukin-6 levels. Moreover, interleukin-6 levels were increased when fibroblasts were cultured in conditioned media derived from normal human keratinocytes and squamous carcinoma cells-4 cultures. Interleukin-1 alpha secreted by normal human keratinocytes and squamous carcinoma cells-4 cells was mainly responsible for the increased interleukin-6 production in fibroblasts. Although interleukin-1 activity increased linearly with the incubation time in squamous carcinoma cells-4 monocultures, interleukin-1 activity was low and remained unchanged in squamous carcinoma cells-4/3T3 co-cultures. Low interleukin-1 activity was most probably not due to inhibition of interleukin-1 alpha production in squamous carcinoma cells-4/3T3 co-cultures because interleukin-1 alpha messenger RNA expression in squamous carcinoma cells-4 cells remained unchanged in the presence of 3T3 cells. Furthermore, when 3T3 cells were incubated in conditioned medium derived from squamous carcinoma cells-4 cells, high interleukin-1 activity decreased to an undetectable level, suggesting that fibroblasts are involved in the suppression of interleukin-1 activity. The remaining interleukin-1 activity, however, was sufficient for maximal induction of interleukin-6 production in fibroblasts. These results suggest that the interaction between epithelial and mesenchymal cells is at least partly initiated by interleukin-1 alpha secreted by the activated epithelial cell during skin injury or tumor invasion. Interleukin-1 in turn can induce modulation of the synthesis of various pro-inflammatory mediators and proteases in surrounding fibroblasts. An enhanced proteolytic activity and/or a possible induced production of an interleukin-1 inhibitor in fibroblasts and/or a receptor-mediated interleukin-1 consumption by fibroblasts will cause a decrease in interleukin-1 activity and thus exert a negative feedback.
Collapse
Affiliation(s)
- I Boxman
- Department of Dermatology, University Hospital Leiden, Amsterdam, The Netherlands
| | | | | | | |
Collapse
|
74
|
Konkle BA, Schick PK, He X, Liu RJ, Mazur EM. Plasminogen activator inhibitor-1 mRNA is expressed in platelets and megakaryocytes and the megakaryoblastic cell line CHRF-288. ARTERIOSCLEROSIS AND THROMBOSIS : A JOURNAL OF VASCULAR BIOLOGY 1993; 13:669-74. [PMID: 8485117 DOI: 10.1161/01.atv.13.5.669] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Plasminogen activator inhibitor-1 (PAI-1) is present in the platelet alpha-granule and is released on platelet activation. Platelet PAI-1 could either be synthesized by the megakaryocyte or taken up from the plasma. In this report we confirm the presence of PAI-1 protein in human megakaryocytes by Western blot analysis and show its synthesis in guinea pig megakaryocytes by metabolic labeling. We document the presence of PAI-1 mRNA in human platelets and show a 3-kb mRNA species on Northern blot analysis of guinea pig megakaryocytes. Neither untreated CHRF-288 cells, a megakaryoblastic cell line, nor human erythroleukemia (HEL) cells expressed PAI-1 mRNA. Phorbol ester (phorbol 12-myristate 13-acetate, 160 nM) treatment of CHRF-288 and HEL cells for 4 days induced PAI-1 mRNA expression in CHRF-288 cells but not in HEL cells. These studies show that PAI-1 is synthesized by megakaryocytes. Megakaryocytes most likely determine the PAI-1 content of platelets and thereby establish the antifibrinolytic potential of the platelet.
Collapse
Affiliation(s)
- B A Konkle
- Cardeza Foundation for Hematologic Research, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107
| | | | | | | | | |
Collapse
|
75
|
|
76
|
van Hinsbergh VW. Impact of endothelial activation on fibrinolysis and local proteolysis in tissue repair. Ann N Y Acad Sci 1992; 667:151-62. [PMID: 1285019 DOI: 10.1111/j.1749-6632.1992.tb51607.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
77
|
Fujii S, Sawa H, Saffitz JE, Lucore CL, Sobel BE. Induction of endothelial cell expression of the plasminogen activator inhibitor type 1 gene by thrombosis in vivo. Circulation 1992; 86:2000-10. [PMID: 1451272 DOI: 10.1161/01.cir.86.6.2000] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND We have shown previously that products from activated platelets can augment synthesis of plasminogen activator inhibitor type 1 (PAI-1) in cultured endothelial and hepatoma (Hep G2) cells in vitro and increase plasma PAI-1 activity in vivo in rabbits. Accordingly, the effects of activation of platelets associated with thrombosis and thrombolysis in vivo on plasma PAI-1 activity and expression of the PAI-1 gene in endothelium, liver, and other organs were characterized. METHODS AND RESULTS Endothelial injury giving rise to platelet-rich thrombi was induced with electrical stimulation in carotid arteries in rabbits. Clot lysis and recanalization were induced subsequently with intravenous tissue-type plasminogen activator (t-PA) and verified with Doppler flow probes. Plasma PAI-1 activity (mean +/- SD) increased from 6 +/- 2 arbitrary units (AU)/ml to 129 +/- 48 AU/ml (n = 15) within several hours after recanalization. When t-PA had failed to induce recanalization, the increase was much less (from 7 +/- 2 to 42 +/- 23 AU/ml, n = 11). To define mechanisms responsible for these changes, PAI-1 messenger RNA (mRNA) was evaluated by Northern blot analysis and localized in tissues by in situ hybridization. Strong and consistent induction of PAI-1 mRNA was evident in aorta, heart, and liver of animals subjected to thrombosis (twofold to threefold increases compared with values in controls), particularly in those in which thrombolysis had been induced (fourfold to sixfold). After thrombolysis, an intense, PAI-1 mRNA-specific signal was detected in endothelium of aorta, liver, and heart, with less intense signals in endothelium of lung, adrenals, and kidneys. CONCLUSIONS The increases in plasma PAI-1 activity follow a preceding increase in endothelial cell expression of the PAI-1 gene as reflected by PAI-1 mRNA levels. Thus, increased synthesis of endothelial cell PAI-1 after thrombosis and thrombolysis may attenuate endogenous fibrinolysis early after coronary thrombolysis, thereby potentiating early, thrombotic reocclusion.
Collapse
Affiliation(s)
- S Fujii
- Cardiovascular Division, Washington University School of Medicine, St. Louis, MO 63110
| | | | | | | | | |
Collapse
|
78
|
Changes in tissue content and hepatic clearance of tissue-type plasminogen activator during diet-induced hyperlipidaemia in rats. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0268-9499(92)90078-v] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
79
|
Reilly C, Hutzelmann J. Plasminogen activator inhibitor-1 binds to fibrin and inhibits tissue-type plasminogen activator-mediated fibrin dissolution. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)41903-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
80
|
Induction of t-PA Synthesis with intravenous bolus injection of vitamin A palmitate in vitamin a deficient rats. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0268-9499(92)90077-u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
81
|
Quax PH, Frisdal E, Pedersen N, Bonavaud S, Thibert P, Martelly I, Verheijen JH, Blasi F, Barlovatz-Meimon G. Modulation of activities and RNA level of the components of the plasminogen activation system during fusion of human myogenic satellite cells in vitro. Dev Biol 1992; 151:166-75. [PMID: 1315696 DOI: 10.1016/0012-1606(92)90224-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Primary cultures of human myogenic stem cells (satellite cells) mimic myogenic differentiation. During this process, the expression of the components of the plasminogen activation system underwent modulation. Activities and mRNA levels of tissue-type and urokinase-type plasminogen activator were increased in a reproducible pattern during differentiation. A modulation of the mRNA level of PAI-2 was also observed. Human satellite cells expressed a urokinase receptor and also the mRNA level of this component underwent modulation. With the exception of PAI-1 mRNA, the level of all mRNAs increased from Day 4 to Day 8, i.e., just before myoblasts fusion, and then remained high at later stages. The modulation of the plasminogen activating activity indicates that this system is directly involved in the fusion process of myogenic differentiation.
Collapse
Affiliation(s)
- P H Quax
- Laboratoire de Myogénèse et Régénération Musculaire (MYREM), Université Paris XII, Créteil, France
| | | | | | | | | | | | | | | | | |
Collapse
|
82
|
Kuiper J, Rijken DC, de Munk GA, van Berkel TJ. In vivo and in vitro interaction of high and low molecular weight single-chain urokinase-type plasminogen activator with rat liver cells. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)45986-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
83
|
Affiliation(s)
- M F Scully
- Thrombosis Research Institute, Chelsea, London
| |
Collapse
|
84
|
|
85
|
Bosma P, Kooistra T. Different induction of two plasminogen activator inhibitor 1 mRNA species by phorbol ester in human hepatoma cells. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)55205-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
86
|
Kooistra T. The use of cultured human endothelial cells and hepatocytes as an in vitro model system to study modulation of endogenous fibrinolysis. ACTA ACUST UNITED AC 1990. [DOI: 10.1016/0268-9499(90)90352-k] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|