Abstract:
OBJECTIVES:We recently reported that bacterial lipopolysaccharide stimulates release of tumor necrosis factor (TNF)-alpha from both human vascular tissue and cultured smooth muscle cells. In the current study, we tested the hypothesis that increased intracellular cyclic adenosine 3',5'-monophosphate (cAMP) could inhibit TNF-alpha release. DESIGN:Prospective, repeated-measures analysis. SETTING:Academic research laboratory. SUBJECTS:Segments of internal mammary artery and saphenous vein from patients undergoing coronary artery bypass surgery. MEASUREMENTS AND MAIN RESULTS:Segments of saphenous vein and internal mammary artery and confluent smooth muscle cells cultured from these vessels were incubated in the presence of 20 micrograms/mL bacterial lipopolysaccharide, alone or with the addition of forskolin or 8-Br-cAMP. At 0, 1, 3, 6, 18, and 24 hrs, the incubation medium was removed from vessel segments or cells and was analyzed for biologically active TNF-alpha, using the L929 cell cytotoxicity assay. cAMP was extracted from tissue and cells with 0.1 N HCl and was analyzed by radioimmunoassay. Bacterial lipopolysaccharide stimulated the release of TNF-alpha from internal mammary smooth muscle cells at all time points. For example, at 6 hrs, TNF-alpha concentration in the medium from lipopolysaccharide-stimulated cells was 20 +/- 1.6 U/mg of cell protein, compared with 0.9 +/- 0.5 U/mg of cell protein in control cell medium (p < .05). Forskolin-inhibited bacterial lipopolysaccharide stimulated TNF-alpha release. In the presence of lipopolysaccharide and forskolin, TNF-alpha release at 6 hrs was 8.6 +/- 1.5 U/mg of cell protein (p < .05 vs. in the presence of bacterial lipopolysaccharide alone). Bacterial lipopolysaccharide, alone, had no effect on intracellular cAMP. Forskolin increased intracellular cAMP levels to 74.0 +/- 12 pmol/mg of cell protein at 6 hrs from a control level of 7.7 +/- 0.4 pmol/mg (p < .05). The 8-Br-cAMP, an agent that mimics the action of intracellular cAMP, also inhibited TNF-alpha release stimulated by lipopolysaccharide. Similar inhibition by forskolin and 8-Br-cAMP on TNF-alpha release was obtained with smooth muscle cells from saphenous vein. Finally, in tissue segments from either internal mammary artery or saphenous vein, both forskolin and 8-Br-cAMP inhibited lipopolysaccharide-stimulated TNF-alpha release. CONCLUSIONS:These results are consistent with the conclusion that vascular tissue, particularly the smooth muscle cell, is a source of TNF-alpha. Further, bacterial lipopolysaccharide-stimulated tumor TNF-alpha release can be inhibited by increased intracellular cAMP.
journal_name
Crit Care Medjournal_title
Critical care medicineauthors
Zhang LM,Castresana MR,Shaker IJ,Dalton ML,Leeper-Woodford SK,Newman WHdoi
10.1097/00003246-199711000-00025subject
Has Abstractpub_date
1997-11-01 00:00:00pages
1855-61issue
11eissn
0090-3493issn
1530-0293journal_volume
25pub_type
杂志文章abstract:OBJECTIVES:To review the difficulties associated with defining sepsis and its complications and to characterize the role of the proinflammatory cytokines in the development of human septic shock, adult respiratory distress syndrome, and the systemic inflammatory response syndrome. DATA SOURCES:Information presented at...
journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:
更新日期:1994-07-01 00:00:00
abstract:OBJECTIVE:To determine the number of adult or pediatric intensive care unit patients without documented invasive fungal infection who receive systemic antifungal therapy. DESIGN:A 1-day cross-sectional cohort study. SETTING:One hundred sixty-nine intensive care units in France and Belgium. PATIENTS:All patients stay...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e318236f297
更新日期:2012-03-01 00:00:00
abstract:OBJECTIVES:Given the efficacy and safety of recombinant human activated protein C (rhAPC) in the systemic inflammatory response syndrome, this study was designed to review the evidence for a role for APC in the pathogenesis of preeclampsia. Preeclampsia is a proinflammatory and procoagulant state, and it is a pregnancy...
journal_title:Critical care medicine
pub_type: 临床试验,杂志文章,随机对照试验,评审
doi:10.1097/00003246-200208000-00035
更新日期:2002-08-01 00:00:00
abstract:OBJECTIVE:To assess the possible benefits of sympatholytics on uncontrolled hemorrhage in unanesthetized rats. DESIGN:A randomized laboratory study using rats to test the effects of sympatholytics on uncontrolled hemorrhage. SETTING:Research laboratory. SUBJECTS:Forty female Sprague-Dawley rats, randomly assigned in...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199909000-00025
更新日期:1999-09-01 00:00:00
abstract:BACKGROUND:Subcutaneously administered low-molecular-weight heparins are widely used for prevention of venous thromboembolism. The appropriateness of the subcutaneous route in critically ill patients has never been established. OBJECTIVE:To determine anti-Xa activities in critically ill patients and in noncritically i...
journal_title:Critical care medicine
pub_type: 临床试验,杂志文章
doi:10.1097/01.CCM.0000059725.60509.A0
更新日期:2003-05-01 00:00:00
abstract:OBJECTIVE:To investigate the optimal rewarming rate following therapeutic hypothermia in a rate model of cardiopulmonary resuscitation. Both clinical and laboratory studies have demonstrated that mild therapeutic hypothermia following cardiopulmonary resuscitation improves myocardial and neurologic outcomes of cardiac ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e3182a63fff
更新日期:2014-02-01 00:00:00
abstract:OBJECTIVE:To evaluate the effect of treatment with murine recombinant interleukin-1 beta on inflammatory infiltrate and tissue damage after experimental endotoxic challenge. DESIGN:Randomized, controlled study. SETTING:Experimental Unit, Virgen de las Nieves University Hospital. SUBJECTS:Seventy-two female CBA/H mic...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200208000-00025
更新日期:2002-08-01 00:00:00
abstract::Instantaneous heart rate, indices of long-term and short-term heart-rate variability (HRV), and transcutaneous O2 (PtcO2) and CO2 (PtcCO2) tensions were recorded simultaneously on 164 occasions in 16 neonates. There was significant inverse correlation between PtcCO2 and both HRV indices, while no linear correlation wa...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-198501000-00003
更新日期:1985-01-01 00:00:00
abstract:OBJECTIVES:To evaluate the impact of a comprehensive unit-based safety program on safety climate in a large cohort of intensive care units participating in the Keystone intensive care unit project. DESIGN/SETTING:A prospective cohort collaborative study to improve quality of care and safety culture by implementing and...
journal_title:Critical care medicine
pub_type: 杂志文章,多中心研究
doi:10.1097/CCM.0b013e318206d26c
更新日期:2011-05-01 00:00:00
abstract::In the last three decades, numerous articles on plasma catecholamine concentrations in various settings have been published in the medical literature. Despite this abundance of information, no summary article has analyzed the species variations in circulating catecholamine concentrations. In this paper, the plasma cat...
journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:
更新日期:1989-11-01 00:00:00
abstract:OBJECTIVES:To understand when the use of high-frequency ventilation would be advantageous, we formulated the problem of achieving adequate alveolar ventilation at minimal pressure cost by dividing it into two simpler problems: a) the pressure cost per unit of convective oscillatory flow; and b) the convective flow cost...
journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:10.1097/00003246-199422091-00004
更新日期:1994-09-01 00:00:00
abstract:OBJECTIVES:To explore the effects of dobutamine and norepinephrine on the global cardiovascular response and on the relationship between oxygen uptake (VO2) and oxygen delivery (DO2) during an acute reduction in blood flow associated with tamponade. DESIGN:Prospective, randomized, controlled acute intervention study. ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199402000-00022
更新日期:1994-02-01 00:00:00
abstract:OBJECTIVE:To assess whether clinical variables might be useful in selecting patients who will have an acute intracranial abnormality seen in head computed tomographic scans (HCT). DESIGN:Retrospective study. SETTING:Medical intensive care unit (MICU) in a tertiary teaching hospital. MEASUREMENTS:Medical records of p...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200005000-00008
更新日期:2000-05-01 00:00:00
abstract:OBJECTIVE:To describe opioid use after ICU admission, identify factors associated with chronic opioid use after critical care, and determine if chronic opioid use is associated with an increased risk of death. DESIGN:Retrospective cohort study. SETTING:Sweden including all registered ICU admissions between 2010 and 2...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0000000000004896
更新日期:2021-01-28 00:00:00
abstract::Laboratory evaluation and use of the Engström metabolic computer (EMC) in a clinical setting are described. The accuracy of the EMC was tested using an inert gas dilution technique. Mean errors in oxygen consumption (VO2) and CO2 production compared with predicted values were less than 2% of predicted, and generally l...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199008000-00016
更新日期:1990-08-01 00:00:00
abstract:OBJECTIVE:To compare the effectiveness and safety of the hemoglobin-based nitric oxide scavenger, pyridoxalated hemoglobin polyoxyethylene, against placebo in patients with vasopressor-dependent distributive shock. DESIGN:Multicenter, randomized, placebo-controlled, open-label study. SETTING:Sixty-one participating I...
journal_title:Critical care medicine
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/CCM.0000000000000554
更新日期:2015-01-01 00:00:00
abstract:OBJECTIVES:Most knowledge related to the pathophysiology of microcirculation in ischemic stroke comes from experimental research. Unfortunately, data on microcirculation in the human brain are limited, partially as a result of the lack of appropriate investigational techniques. The objective of our study was to test th...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e31820ead5e
更新日期:2011-05-01 00:00:00
abstract::In a prospective randomized study to determine whether prevention of colonization of Gram-negative bacteria results in prevention of Gram-negative bacterial infections, 96 intensive care patients were randomly allocated into a control group and a study group. The study group received oral nonabsorbable antimicrobial a...
journal_title:Critical care medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00003246-198811000-00001
更新日期:1988-11-01 00:00:00
abstract:OBJECTIVE:To determine the effect of a bolus infusion of diaspirin cross-linked hemoglobin (DCLHb or hemoglobin crosfumaril) on the ileal mucosal microcirculation in septic rats. DESIGN:Prospective, randomized, single-blinded study. SETTING:University-affiliated animal research laboratory. SUBJECTS:Twenty-four male ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200003000-00029
更新日期:2000-03-01 00:00:00
abstract::The effects of the Trendelenburg (TREND) position and passive straight leg raising (PLR) on cardiopulmonary performance in 18 anesthetized patients undergoing myocardial revascularization were studied with a two-dimensional transesophageal echocardiography probe and a thermodilution right ventricular ejection fraction...
journal_title:Critical care medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00003246-198904000-00003
更新日期:1989-04-01 00:00:00
abstract:OBJECTIVE:To assess the value of soluble triggering receptor expressed on myeloid cells-1 as a biomarker of infection in patients with neutropenic fever comparing with procalcitonin and C-reactive protein. DESIGN:Prospective, comparative, single-center study. SETTING:Hematology ward at a university hospital. SUBJECT...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e31820a92dc
更新日期:2011-05-01 00:00:00
abstract:OBJECTIVE:To provide a conceptual and clinical review of the physiology of the venous system as it is relates to cardiac function in health and disease. DATA:An integration of venous and cardiac physiology under normal conditions, critical illness, and resuscitation. SUMMARY:The usual teaching of cardiac physiology f...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e3182772ab6
更新日期:2013-01-01 00:00:00
abstract:OBJECTIVE:To assess the statistical association of the Acute Physiology and Chronic Health Evaluation (APACHE II) score with multiple intervention and outcome variables in surgical ICU patients. DESIGN:Continuous data collection on every patient admitted to the surgical ICU for a 21-month period. MATERIALS AND METHOD...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199108000-00013
更新日期:1991-08-01 00:00:00
abstract:BACKGROUND:Hypertonic saline is the recommended therapy to shrink swollen brain cells in patients with acute hyponatremia accompanied by seizures. OBJECTIVES:In the absence of hypertonic saline, hypertonic mannitol will shrink the cell volume. Because mannitol is excreted rapidly, our aim was to ensure that it would b...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-200006000-00037
更新日期:2000-06-01 00:00:00
abstract::Disseminated intravascular coagulation (DIC) is an acquired syndrome characterized by intravascular fibrin formation occurring in the course of a variety of severe diseases. In gram-negative sepsis, endotoxin is the bacterial component eliciting a cascade of tissue factor dependent hypercoagulable reactions mediated b...
journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:10.1097/00003246-200009001-00003
更新日期:2000-09-01 00:00:00
abstract:OBJECTIVES:Studies have shown contradicting results on the association of nursing workload and mortality. Most of these studies expressed workload as patients per nurse ratios; however, this does not take into account that some patients require more nursing time than others. Nursing time can be quantified by tools like...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0000000000004005
更新日期:2020-01-01 00:00:00
abstract:OBJECTIVE:To validate performance characteristics of the intensive care unit (ICU) admission mortality probability model, version III (MPM0-III) on Project IMPACT data submitted in 2004 and 2005. This data set was external from the MPM0-III developmental and internal validation data collected between 2001 and 2004. DE...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e31819ded31
更新日期:2009-05-01 00:00:00
abstract:OBJECTIVES:Although the mortality of severe sepsis is easily quantified, the actual cause and timing of death from severe sepsis are less defined. We used the INDEPTH (International Integrated Database for the Evaluation of Severe Sepsis and Drotrecogin alfa activated) database to investigate the reported cause of deat...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/CCM.0b013e31820eda29
更新日期:2011-05-01 00:00:00
abstract:OBJECTIVES:Muscle weakness associated with critical illness can be due to the illness itself, immobilization associated with it, and/or to concomitant use of drugs that affect neuromuscular transmission. This study investigated the contribution of immobilization per se to the muscle dysfunction, as well as the associat...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199902000-00031
更新日期:1999-02-01 00:00:00
abstract:OBJECTIVE:To determine the activation of nuclear factor-[kappa]B in peripheral blood CD14+ monocyte/macrophages and CD3+, CD4+, and CD8+ T cells in children with sepsis. DESIGN:Observational study. SETTING:University hospital. PATIENTS:Twenty-six children with sepsis (nine females and 17 males, aged between 10 days ...
journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/01.ccm.0000284502.38701.e6
更新日期:2007-10-01 00:00:00