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  • endotoxin  (2)
  • pseudointimal hyperplasia  (2)
  • [Ca2+]i and [Ca2+]n  (1)
  • 1
    ISSN: 1436-2813
    Keywords: prostaglandin ; aspirin ; renal insuffiency ; endotoxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of the anticoagulants, heparin and low molecular weight heparin (LMWH), and the antiplatelet agents, prostaglandin E1 (PGE1) and aspirin, on endotoxin-induced renal insufficiency not induced by prerenal factors, were investigated using rabbits to evaluate the clinical usefulness of these drugs and their possible involvement in the activation of hemostasis in renal insufficiency. The intravenous administration of PEG1, at 0.4 μg/kg/min, or aspirin, at 5 mg/kg, significantly restored all the parameters of renal function measured in the present study, namely, effective renal plasma flow, glomerular filtration rate and urine N-acetyl-β-D-glucosaminidase, as well as histological renal ischemic changes. On the other hand, neither heparin nor LMWH, even at a high dose, improved any parameter. As the antiplatelet effect is the common property of PGE1 and aspirin, it is suggested that the activation of platelets may be prerequisite to the occurrence of renal insufficiency induced by endotoxin. The results of this study thus show that PGE1 or aspirin may be applied in clinical use for renal insufficiency complicated by sepsis or endotoxemia.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2813
    Keywords: pseudointimal hyperplasia ; fibril length ; PTFE ; animal model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In addition to the polytetrafluoroethylene (PTFE) vascular graft (G) with its conventionally smooth surface, a unique PTFE graft with a ridged outer wall (T) is now also currently available for clinical use. Although an excellent antikinking property is provided by this unique outer structure, the possible influence of the structure on the formation of pseudointima has not yet been investigated in detail. Four kinds of T grafts (3 mm inner diameter, 3 cm long) with various fibril lengths (FL, T-15, T-30, T-60, T-90) and a G graft with 30 μm FL (G-30) were implanted into the inferior vena cava of rabbits. The patency of the grafts at 4 weeks were as follows: 6/8(T-15), 6/8(T-30), 5/8(T-60), 0/8(T-90) and 4/6 (G-30). Pseudointimal hyperplasia (PH) of the T grafts advanced as the FL increased, judging by the thickness of the pseudointima, cellular density, and maturity of fibroblasts. In addition, the maturity of endothelial-like cells on the luminal surface increased as the FL increased. The degree of pseudomintimal hyperplasia in G-30 was comparable to that of T-15, although the maturity of the endothelial-like cells was similar to that of T-60. Microscopically, there was a microheterogeneity of cellular density in T grafts probably due to the uneven outer structure. In conclusion, not only FL but also the outer structure of PTFE may thus influence the formation of the pseudointima.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-2813
    Keywords: prostacyclin analogue ; pseudointimal hyperplasia ; venous prosthesis ; animal model ; smooth muscle cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of this study was to evaluate the effect of a novel prostaglandin I2 analogue, beraprost (BPT), on the pseudointimal hyperplasia (PIH) of polytetrafluoroethylene (PTFE) prostheses. A total of 12 rabbits were equally divided into three groups. The control group was given a placebo daily, group 1 was given BPT orally 2 mg/kg per day, and group 2 was given BPT orally 4 mg/kg b.i.d. Exactly 1 cm of the inferior vena cava was resected and replaced by a 3-cm PTFE tube graft. All the grafts were patent when harvested 4 weeks after implantation, but the lumens were narrowed to various extents by PIH. PIH, determined by the dry weight of the intraluminal tissue deposit, was significantly (P〈0.01) suppressed in groups 1 and 2 compared with the control group. High-magnification light microscopy with various staining methods revealed the PIH to be composed mainly of smooth muscle cells (SMCs) and collagen fibrils in all three groups. Transmission electron microscopy revealed that the majority of SMCs in groups 1 and 2 were contractile in form, in contrast with the synthetic form seen in the control group. In conclusion, BPT attenuated the PIH of PTFE grafts by inhibiting the phenotype change in the SMCs.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1436-2813
    Keywords: sepsis ; systemic inflammatory response syndrome (SIRS) ; hepatocyte growth factor (HGF) ; endotoxin ; beta-glucan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Interleukin-1 (IL-1), a cytokine released from macrophages by endotoxin stimulation, has been shown to upregulate the genetic expression of the hepatocyte growth factor (HGF). The present study was conducted to determine whether plasma HGF is increased in patients with systemic inflammatory response syndrome (SIRS). The plasma levels of HGF, endotoxin, and beta-glucan were measured in 41 surgical patients without hepatic diseases, 18 of whom had been diagnosed with sepsis, and 33, with nonseptic SIRS. The plasma HGF was found to be significantly increased in the 18 patients with sepsis, at 0.69±0.47 ng/ml (mean ± SD), and in the 23 patients with nonseptic SIRS, at 0.49±0.37 ng/ml, compared to values in 40 normal controls, at 0.10±0.03 ng/ml (P〈0.001). No significant correlations were observed between the plasma levels of HGF and endotoxin (r=0.02) or beta-glucan (r=−0.05) in any of the patients; however, plasma HGF was significantly correlated with the WBC count (r=0.34, P〈0.05) and with total bilirubin (r=0.45, P〈0.01). Plasma HGF was also strongly correlated with alanine transaminase (ALT) in 8 patients with ALT levels higher than 50 U/I (r=0.70), but there was no such correlation in 33 patients with ALT levels of 50 U/I or less (r=0.30). Thus, although the clinicopathologic significance of HGF is not well understood, the present findings indicate that plasma HGF increases in response to infection or inflammation.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0730-2312
    Keywords: [Ca2+]i and [Ca2+]n ; Ca2+ gradients ; confocal laser scanning microscopy ; Fluo-3 ; heterogeneity ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Ca2+ concentration inside human umbilical vein endothelial cells was studied separately in cytosol and nucleus by a confocal laser scanning microscopy using fluo-3. The in vivo calibration curve for cytosol and nucleus showed good linearity between fluorescence intensity and Ca2+ concentration in cytosol ([Ca2+]i) and nuclei ([Ca2+]n). After calibration, [Ca2+]n was constantly higher than [Ca2+]i before and after the chelation of extracellular Ca2+ suggesting an active Ca2+ accumulation system on nuclear membrane. [Ca2+]n was also constantly higher than [Ca2+]i after the stimulation of thrombin (0.05 U/ml), FCS (10%), and thapsigargin (Tsg, 1μM). The temporal change of [Ca2+]n and [Ca2+]i was identical, and [Ca2+]i gradient towards the nucleus and peripheral or central [Ca2+]n rise was observed after these stimulations. From these results, [Ca2+]n is not only regulated by the active Ca2+ accumulation system on nuclear membrane at rest but also the generation of Inositol-triphosphate. FCS caused heterogeneous [Ca2+]n or [Ca2+]i rise from cell to cell; single spike or oscillatory change of [Ca2+]n and [Ca2+]i was observed in about 56% of cells, which were completely abolished by the chelation of extracellular Ca2+, suggesting that FCS stimulated [Ca2+]n and [Ca2+]i rise solely depending on Ca2+ influx from extracellular medium. The higher concentration of [Ca2+]n and heterogeneous [Ca2+]n rise may have important roles in nuclear-specific cellular responses. © 1996 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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