endothelin-1 and Acute-Lung-Injury

The alveolar-capillary membrane serves as a barrier that prevents the accumulation of fluid in the alveolar space and restricts the diffusion of large solutes while facilitating an efficient gas exchange. When this barrier becomes dysfunctional, patients develop acute lung injury (ALI), which is characterized by pulmonary edema and increased lung inflammation that leads to a life-threatening impairment of gas exchange. In addition to the increase of inflammatory cytokines, plasma levels of endothelin-1 (ET-1), which is a primarily endothelium-derived vasoconstrictor, are increased in patients with ALI. As patients recover, ET-1 levels decrease, which suggests that ET-1 may not only be a marker of endothelial dysfunction but may have a role in the pathogenesis of ALI. While pulmonary edema accumulates, alveolar fluid clearance (AFC) is of critical importance, as failure to return to normal clearance is associated with poor prognosis in patients with pulmonary edema. AFC involves active transport mechanisms where sodium (Na(+)) is actively transported from the alveolar airspaces, across the alveolar epithelium, and into the pulmonary circulation, which creates an osmotic gradient that is responsible for the clearance of lung edema. In this article, we review the relevance of ET-1 in the development of ALI, not only as a vasoconstrictor molecule but also by inhibiting AFC via the activation of endothelial ET-B receptors and generation. Furthermore, this review highlights the therapeutic role of drugs such as beta-adrenergic agonists and, in particular, of endothelin receptor antagonists in patients with ALI.

Topics: Acute Lung Injury; Adrenergic beta-Agonists; Endothelin Receptor Antagonists; Endothelin-1; Humans

Social anxiety (SA) and depression are prevalent, often comorbid disorders, associated with poor psychosocial functioning. Experimental psychopathology approaches can clarify the transdiagnostic mechanisms underlying these disorders, but most laboratory tasks are limited. We developed and validated the Audio-Dialogue Inductions of Social Stress (A-DISS) experimental task to model real-time rejection sensitivity in a realistic and developmentally relevant context. Participants are asked to imagine overhearing peers at a party talking badly about them (Rejection) or a teacher at their school (Neutral).. The Rejection condition elicited higher negative affect/lower positive affect while the Neutral condition sustained stable affect. Findings were consistent across gender and race/ethnicity. Moderation analyses were statistically significant; participants with elevated SA or depression reported feeling more rejected, insecure, and anxious after Rejection than those with below average symptoms.. Findings provide preliminary validation of a novel peer rejection task for research on understanding the affective experience of real-time rejection overall, especially for those with elevated SA and depression. SA and depression symptoms each uniquely moderating the effects of Rejection exposure on similar affective states, suggests individuals with SA or depression may benefit from interventions targeting specific reactions to rejection/stress and transdiagnostic risk factors.. Our results suggest that T lymphocyte immune dysfunction does exist in adult ITP patients and plays an important role in the pathogenesis of ITP.. ClinicalTrials.gov, identifier NCT03575988.. Brown/beige adipocyte-specific h

Topics: A549 Cells; Acute Lung Injury; Adipose Tissue, Brown; Adipose Tissue, White; Adolescent; Adult; Aged; Animals; Anthropometry; Anti-Inflammatory Agents; Antiviral Agents; Arachidonic Acid; Archaeoglobus fulgidus; Australia; Blood Glucose; Blotting, Western; Carcinoma, Hepatocellular; Cathartics; Cell Differentiation; Chemokine CCL2; Child; China; Colonoscopy; Crosses, Genetic; Cyclin B1; Diabetes Mellitus, Type 1; Diabetes Mellitus, Type 2; Drugs, Chinese Herbal; Endothelin-1; Endothelium, Vascular; Enzyme-Linked Immunosorbent Assay; Female; Finland; Follow-Up Studies; Genes, Dominant; Glycated Hemoglobin; Hepatitis B e Antigens; Hepatitis B virus; Hepatitis B, Chronic; Homeodomain Proteins; Humans; Hypothalamus; Incidence; Inflammatory Bowel Diseases; Interleukin-1beta; Interleukin-6; Italy; Lipopolysaccharides; Liver Cirrhosis; Liver Neoplasms; Lung; Male; Mice; MicroRNAs; Middle Aged; Motivational Interviewing; NAD; Neuroendocrine Tumors; NF-kappa B; Nitric Oxide; Nitriles; Outpatients; Oxidoreductases; Phenotype; Pilot Projects; Polyethylene Glycols; Polymorphism, Genetic; Prospective Studies; Protein Interaction Maps; Quality of Life; Reproducibility of Results; Shewanella; Signal Transduction; Spain; Sulfides; Sulfones; Thermogenesis; Transcription Factors; Treatment Outcome; Tumor Necrosis Factor-alpha; Uncoupling Protein 1; United Kingdom

Using a lipopolysaccharide (LPS) model of acute lung injury, we have previously shown that endothelin-1 (ET-1), a potent mediator of vasoconstriction, may act as a "gatekeeper" for the influx of inflammatory cells into the lung. To further investigate the potential of ET-1 to limit the progression of lung injury, hamsters were treated with an endothelin receptor antagonist (ERA), HJP272, either 1 h prior to intratracheal instillation of bleomycin (BLM) or 24 h afterwards. Lung injury and repair were examined by measuring the following parameters: 1) histopathological changes; 2) neutrophil content in bronchoalveolar lavage fluid (BALF); 3) lung collagen content; 4) tumor necrosis factor receptor 1 (TNFR1) expression by BALF macrophages; 5) BALF levels of: a) transforming growth factor beta-1 (TGF-β1), b) stromal cell-derived factor 1 (commonly referred to as CXCL12), and c) platelet-derived growth factor BB (PDGF-BB); 6) alveolar septal cell apoptosis (as measured by the TUNEL assay). For each of these parameters, animals pretreated with HJP272 showed significant reductions compared to those receiving BLM alone. In contrast, post-treatment with HJP272 was either ineffective or produced only marginally significant changes. The efficacy of a single pretreatment with HJP272 prior to induction of lung injury suggests that subsequent features of the disease are determined at a very early stage. This may explain why ERAs are not an effective treatment for human pulmonary fibrosis. Nevertheless, our findings suggest that they may be useful as prophylactic agents when given in combination with drugs that have fibrogenic potential.

Topics: Acute Lung Injury; Animals; Bleomycin; Bronchoalveolar Lavage Fluid; Cricetinae; Disease Models, Animal; Endothelin-1; Female; Humans; Hydroxyquinolines; In Situ Nick-End Labeling; Lipopolysaccharides; Macrophages; Mesocricetus; Neutrophils; Pulmonary Fibrosis; Time Factors

Decline in oxygen availability experienced under hypobaric hypoxia (HH) mediates imbalance in lung fluid clearance and is a causative agent of acute lung injury. Here, we investigate the pathological events behind acute HH mediated lung injury and assess the therapeutic efficacy of nanocurcumin in its amelioration. We assess the protective efficacy of nanotized curcumin (nanocurcumin) in ameliorating HH induced lung injury and compare to curcumin. Rats exposed to acute HH (6, 12, 24, 48 and 72 h) were subjected to histopathology, blood-gas analysis and clinical biochemistry, cytokine response and redox damage. HH induced lung injury was analysed using markers of lung injury due to pulmonary vasoconstriction (ET-1/2/3 and endothelin receptors A and B) and trans-vascular fluid balance mediator (Na+/K+ ATPase). The protective efficacy of nanocurcumin was analysed by examination of Akt/Erk signalling cascade by western blot. HH induced lung injury was associated with discrete changes in blood analytes, differential circulatory cytokine response and severe pulmonary redox damages. Up-regulation of ET-1/2/3 and its receptors along with down-regulation of Na+/K+ ATPase confirmed defective pulmonary fluid clearance which promoted edema formation. Nanocurcumin treatment prevented lung edema formation and restored expression levels of ET-1/2/3 and its receptors while restoring the blood analytes, circulatory cytokines and pulmonary redox status better than curcumin. Modulation in Akt/Erk signalling pathway in rat lungs under HH confirmed the protective efficacy of nanocurcumin.

Topics: Acute Lung Injury; Animals; Biomarkers; Curcumin; Disease Models, Animal; Endothelin-1; Endothelin-2; Endothelin-3; Gene Expression Regulation; Hypoxia; Male; Mitogen-Activated Protein Kinase 1; Mitogen-Activated Protein Kinase 3; Nanostructures; Oxidation-Reduction; Protective Agents; Proto-Oncogene Proteins c-akt; Rats; Rats, Sprague-Dawley; Receptor, Endothelin A; Receptor, Endothelin B; Signal Transduction; Sodium-Potassium-Exchanging ATPase

Among the dysfunctions and pathologies associated with sepsis, the underlying molecular mechanisms of sepsis-induced acute lung injury (ALI) are poorly understood. Endothelin (ET)-1, a potent vasoconstrictor and pro-inflammatory peptide, is known to be involved in the pathogenesis of ALI in a rat model of sepsis. Here, we investigated whether landiolol hydrochloride, an ultra-short-acting β-blocker, plays a crucial role in ameliorating and attenuating LPS-induced ALI through modulation of the ET-1 system. Male Wistar rats at 8weeks of age were administered with either saline or lipopolysaccharide (LPS) for three hours (3h) and some of the LPS-administered rats were continuously treated with landiolol for 3h. ALI was induced by LPS, including levels of both circulatory and pulmonary TNF-α and IL-6 but [PaO

Topics: Acute Lung Injury; Adrenergic beta-Antagonists; Animals; Down-Regulation; Endothelin-1; Lung; Male; Morpholines; Rats, Wistar; RNA, Messenger; Sepsis; Tumor Necrosis Factor-alpha; Urea

Methotrexate (MTX) is used to treat cancers, several forms of arthritis and other rheumatic conditions, although MTX may cause pulmonary toxicity related to the production of free oxygen radicals, various cytokines. Infliximab (IB) with its potent effect on tumor necrosis factor-alpha (TNF-α) inhibition also inhibits the release of endothelin-1 (ET-1). We aimed to investigate whether IB reduces pulmonary damage induced by an overdose of MTX.. The rats were divided into 3 groups of 8 animals. The control group was given only saline. One dose of 20mg/kg MTX intraperitoneal was administered in the MTX group. IB 7 mg/kg was given to the MTX+IB (MI) group. Three days after IB was administered, 20mg/kg MTX was given. Five days after MTX was administered, all rats were sacrificed.. The TNF-α, ET-1, malondialdehyde (MDA), myeloperoxidase (MPO) and caspase-3 levels in MTX group were significantly higher than in control groups of TNF-α (P=.001), ET-1 (P=.001), MDA (P=.001), MPO (P=.001) and caspase-3 levels (P=.001) and MI groups of TNF-α (P=.009), ET-1 (P=.001), MDA (P=.047), MPO (P=.007) and caspase-3 levels (P=.003). The MI group had less histopathological damage in lung tissue than the MTX group.. Overdose of MTX leads to cytokine release and the formation of reactive oxygen species in addition to increased ET-1 secretion release that causes lung damage. IB, as a potent proinflammatory agent, TNF-α blocker, can decrease ET-1 release and oxidative stress, it may show significant protective effects in lung tissue against damage caused by MTX overdose.

Topics: Acute Lung Injury; Animals; Anti-Inflammatory Agents; Apoptosis; Caspase 3; Drug Evaluation, Preclinical; Endothelin-1; Infliximab; Lipid Peroxidation; Male; Malondialdehyde; Methotrexate; Neutrophil Infiltration; Peroxidase; Pulmonary Alveoli; Random Allocation; Rats; Rats, Wistar; Reactive Oxygen Species; Tumor Necrosis Factor-alpha

Previous studies from this laboratory indicate that endothelin-1 (ET-1), a potent vasoconstrictor, may play an important role in lipopolysaccharide (LPS)-induced release of neutrophils from the pulmonary microvasculature. To further test this concept, Syrian hamsters were treated with a novel endothelin receptor A (ETA) antagonist (HJP272) prior to intratracheal instillation of LPS.. The effect of HJP272 on the LPS-induced inflammatory reaction was determined by measuring: (1) lung histopathological changes, (2) total neutrophils in bronchoalveolar lavage fluid (BALF), (3) expression of tumor necrosis factor receptor 1 (TNFR1) by BALF macrophages, and (4) alveolar septal cell apoptosis.. Treatment with HJP272 significantly reduced each of these parameters during a 24-hr period following LPS instillation, supporting the concept that limiting the activity of ET-1 may reduce the extent of lung injury. This hypothesis was further tested by giving ET-1 prior to LPS instillation, which resulted in a marked enhancement of LPS-induced lung inflammation, as measured by BALF neutrophils and TNFR1-positive macrophages. Furthermore, the increase in neutrophils resulting from treatment with ET-1 was significantly reduced by HJP272, again demonstrating the ability of ETA receptor antagonists to limit the influx of these cells into the lung.. These findings suggest a potential therapeutic role for these agents in diseases where neutrophils are a significant cause of lung injury, such as bronchopneumonia, respiratory distress syndrome, and chronic obstructive pulmonary disease.

Topics: Acute Lung Injury; Animals; Apoptosis; Bronchoalveolar Lavage Fluid; Cytoprotection; Disease Models, Animal; Endothelin A Receptor Antagonists; Endothelin-1; Female; Hydroxyquinolines; Lipopolysaccharides; Lung; Macrophages; Mesocricetus; Neutrophil Infiltration; Neutrophils; Receptor, Endothelin A; Receptors, Tumor Necrosis Factor, Type I; Signal Transduction; Time Factors

Paraquat poisoning is well known for causing multiple organ function failure (MODS) and high mortality. Acute lung injury and advanced pulmonary fibrosis are the most serious complications. Bosentan is a dual endothelin receptor antagonist. It plays an important role in treating PF. There is no related literature on the use of bosentan therapy for paraquat poisoning.. To study the use of bosentan to treat acute lung injury and pulmonary fibrosis as induced by paraquat.. A total of 120 adult Wister male rats were randomly assigned to three groups: the paraquat poisoning group (rats were intragastrically administered with paraquat at 50 mg/kg body weight once at the beginning); the bosentan therapy group (rats were administered bosentan at 100 mg/kg body weight by intragastric administration half an hour after paraquat was administered, then the same dose was administered once a day); and a control group (rats were administered intragastric physiological saline). On the 3rd, 7th, 14th, and 21st days following paraquat exposure, rats were sacrificed, and samples of lung tissue and venous blood were collected. The levels of transforming growth factor-β1 (TGF-β1), endothelin-1 (ET-1), and hydroxyproline (HYP) in the plasma and lung homogenate were determined. Optical and electronic microscopes were used to examine pathological changes.. The TGF-β1, ET-1, and HYP of the paraquat poisoning group were significantly higher than in the control group, and they were significantly lower in the 21st day therapy group than in the paraquat poisoning group on the same day. Under the optical and electronic microscopes, lung tissue damage was observed to be more severe but was then reduced after bosentan was administered.. Bosentan can reduce inflammation factor release. It has a therapeutic effect on acute lung injury as induced by paraquat.

Topics: Acute Lung Injury; Alveolar Epithelial Cells; Animals; Bosentan; Disease Models, Animal; Endothelin-1; Hydroxyproline; Male; Paraquat; Rats; Rats, Wistar; Sulfonamides; Transforming Growth Factor beta1

Acute lung injury/acute respiratory distress syndrome (ALI/ARDS) is a serious health problem, and an effective treatment is needed for use in the clinical setting.. In this study, we first constructed ALI models in Adult Sprague-Dawley rats. We then used an herbal medicine, Houttuynia cordata (HC), to enhance the effect of endothelial progenitor cells (EPCs) on ALI.. (1) HC improved the therapeutic effects of EPCs on lipopolysachharide-induced ALI in the rat model; (2) HC down-regulated the anti-inflammatory response by suppressing inflammatory cytokines; (3) the combination of EPC and HC reduced expression of iNOS and ET-1 and subsequently prevented lung injury.. Combined EPC and HC therapy was more effective than either therapy alone. EPC and HC could be used in the clinical treatment of ALI.

Topics: Acute Lung Injury; Animals; Bone Marrow Cells; Disease Models, Animal; Down-Regulation; Endothelial Cells; Endothelin-1; Herbal Medicine; Houttuynia; Interleukin-10; Lipopolysaccharides; Male; Nitric Oxide Synthase Type II; Protective Agents; Rats; Rats, Sprague-Dawley; Stem Cell Transplantation; Stem Cells; Tumor Necrosis Factor-alpha

Inhalation of nitric oxide (INO) exerts both local and distant effects. INO in healthy pigs causes down-regulation of endogenous nitric oxide (NO) production and vasoconstriction in lung regions not reached by INO, especially in hypoxic regions, which augments hypoxic pulmonary vasoconstriction. In contrast, in pigs with endotoxemia-induced lung injury, INO causes increased NO production in lung regions not reached by INO. The aim of this study was to investigate whether INO exerts distant effects in surfactant-depleted lungs.. Twelve pigs were anaesthetised, and the left lower lobe (LLL) was separately ventilated. Lavage injury was induced in all lung regions, except the LLL. In six pigs, 40 ppm INO was given to the LLL (INO group), and the effects on endogenous NO production and blood flow in the lavage-injured lung regions were studied. Six pigs served as a control group. NO concentration in exhaled air (ENO), NO synthase (NOS) activity and cyclic guanosine monophosphate (cGMP) in lung tissue, and regional pulmonary blood flow were measured.. The calcium (Ca(2+) )-dependent NOS activity was lower (P < 0.05) in the lavage-injured lung regions in the INO group than in the control group. There were no measurable differences between the groups for Ca(2+) -independent NOS activity, cGMP, ENO, or regional pulmonary blood flow.. Regional INO did not increase endogenous NO production in lavage-injured lung regions not directly reached by INO, but instead down-regulated the constitutive calcium-dependent nitric oxide synthase activity, indicating that NO may inhibit its own synthesis.

Topics: Acute Lung Injury; Administration, Inhalation; Anesthesia; Animals; Blood Gas Analysis; Bronchoalveolar Lavage; Bronchodilator Agents; Cyclic GMP; Endothelin-1; Endotoxins; Hemodynamics; Lung; Nitric Oxide; Nitric Oxide Synthase; Pulmonary Circulation; Respiration, Artificial; Swine

Endothelin (ET)-1 is a potent vasoconstrictor that has been implicated in the pathogenesis of a number of diseases, and some studies suggest that circulating ET-1 is elevated in sepsis. The present study investigated whether ET plays a role in sepsis-mediated acute lung injury and whether its expression could be down regulated by blockade of TNF-α in septic lung. Male Wistar rats at 8 weeks of age were administered with either saline or lipopolysaccharide (LPS) at different time points (1, 3, 6 and 10 h) and various tests were then performed. The features of acute lung injury were observed at 1 h after LPS administration, which gradually became severe with time. Systolic and diastolic pressures were reduced just about one hour after LPS administration, whereas pulmonary TNF-α levels were significantly increased at various time points after LPS administration. LPS induced a time-dependent expression of ET-1 and ET(A) receptor in the lungs compared to control, peaking and increasing by 3 fold at 6 h after induction of endotoxemia, whereas levels of ET(B) receptor, which has vasodilating effects, were remarkably down regulated time-dependently. We conclude that time-dependent increase of ET-1 and ET(A) receptor with the down regulation of ET(B) receptor may play a role in the pathogenesis of acute lung injury in endotoxemia. Finally, treatment of LPS-administered rats with TNF-α blocking peptide for three hours significantly suppressed levels of pulmonary ET-1. These data taken together, led us to conclude that differential alteration in ET expression and its receptors may be mediated by TNF-α and may, in part, account for the pathogenesis of acute lung injury in endotoxemia.

Topics: Acute Lung Injury; Animals; Blood Gas Analysis; Blood Pressure; Endothelin-1; Endotoxemia; Lactic Acid; Lipopolysaccharides; Lung; Male; Organ Size; Peptides; Rats; Rats, Wistar; Receptors, Endothelin; Tumor Necrosis Factor-alpha

Epithelial dysfunction in lungs plays a key role in the pathogenesis of acute lung injury. The beneficial effects of low potassium dextran glucose solution (LPD) have been reported in lung preservation, and LPD enables injured alveolar pneumocytes to recover. So we hypothesized that systemic administration of LPD may have benefits in treating acute lung injury. We investigated the effects of LPD on arterial blood gas and levels of some cytokines in oleic acid-induced acute lung injury in juvenile piglets.. Oleic acid (0.1 ml/kg) was intrapulmonarily administered to healthy anesthetized juvenile piglets. Ten animals were randomly assigned to two groups (n = 5 each): oleic acid-induced group (control group) with intravenous infusion of 12.5 ml/kg of lactated Ringer's solution 30 minutes before administration of oleic acid and LPD group with systemic administration of LPD (12.5 ml/kg) 30 minutes before injecting oleic acid. Blood gas variables and concentrations of tumor necrosis factor alpha, endothelin 1 and interleukin 10 were measured before and every 1 hour for 6 hours after initial lung injury.. Compared with control group, blood pH, partial pressure of arterial oxygen to fraction of inspired oxygen ratio, partial pressure of arterial carbon dioxide, and mean pulmonary arterial pressure in LPD group were improved (P < 0.05 or 0.01). Six hours after lung injury, concentration of tumor necrosis factor alpha in lung tissue was lower in LPD group than control group (P < 0.05). Plasmic concentration of endothelin 1 showed lower in LPD group while plasmic concentration of interleukin 10 showed higher in LPD group (P < 0.05).. Before lung injury, systemic administration of LPD can improve gas exchange, attenuate pulmonary hypertension, decrease plasmic levels of endothelin 1, increase interleukin 10 and decrease concentration of tumor necrosis factor alpha in lung tissue in oleic acid-induced acute lung injury in juvenile piglets.

Topics: Acute Lung Injury; Animals; Dextrans; Endothelin-1; Female; Glucose; Interleukin-10; Male; Oleic Acid; Swine; Tumor Necrosis Factor-alpha

Acute lung injury (ALI) is a devastating disease, which is characterized by diffuse endothelium, epithelial damage, and increased pulmonary capillary permeability. Recent data have suggested that the circulating endothelial progenitor cells (EPCs) play an important role in endothelial repair after vascular injury. This study was undertaken to investigate possible endothelial-repairing effects of EPC transplantation after LPS-induced ALI in rats. Using Y-chromosome in situ hybridization and reverse transcription polymerase chain reaction assay, we detected the expression of sex-determining region y in the injured lungs of female model rats, suggesting that allogenic EPCs can migrate to the injured lung tissues. Rats that have received the EPC treatment had a reduced pulmonary edema level, inflammation, hemorrhage, and hyaline membrane formation, as well as an increased survival rate from 44% to 81%. Furthermore, anti-inflammatory cytokine IL-10 levels were dramatically increased in the EPC-treated rats compared with the phosphate buffered saline-treated rats. On the contrary, endothelin-1 and iNOS were downregulated in the EPC-treated group. These findings provide evidence that i.v. EPC treatment results in engraftment of EPCs to the injured lung tissue, which can significantly attenuate lung injury and improve survival in ALI rats. The beneficial effects of EPC engraftment is likely to come from maintaining the integrity of pulmonary alveolar-capillary barrier, reestablishing the endothelial function in vessels and ameliorating the inflammatory state.

Topics: Acute Lung Injury; Animals; Down-Regulation; Endothelial Cells; Endothelin-1; Female; Interleukin-10; Lipopolysaccharides; Male; Nitric Oxide Synthase Type II; Rats; Rats, Sprague-Dawley; Sex-Determining Region Y Protein; Stem Cell Transplantation; Stem Cells

Endothelin-1 (ET-1) is a mediator of lung diseases and a potent pulmonary vasoconstrictor. In addition to thromboxane A2, it participates in the formation of lung edema. Both lidocaine and mepivacaine attenuate the increase of pulmonary arterial pressure (PAP) and lung edema development. We examined the effects of procaine, bupivacaine, and ropivacaine on experimentally evoked PAP increase and ET-1 release.. PAP and lung weight were measured in isolated rat lungs during perfusion with Krebs-Henseleit hydroxyethyl starch buffer. Bupivacaine, ropivacaine, or procaine was added to the solution at concentrations of 10(-2)-10(-7) mg/kg. ET-1 levels were measured in the perfusate by enzyme-immunoassay, and thromboxane A2 levels were assayed by radioimmunoassay. N-formyl-L-leucine-methionyl-L-phenylalanine was used to activate human polymorphonuclear neutrophils.. Bupivacaine, ropivacaine, and procaine significantly attenuated increases of PAP (P < 0.05) and resulted in a reduction of lung weight in these treatment groups compared with the sham group (P < 0.05). The long-acting anesthetics bupivacaine and ropivacaine (P < 0.05), but not procaine, reduced ET-1 levels, produced low inflammation rates, and did not affect lung structures at doses from 10(-3) to 10(-6) mg/kg.. Bupivacaine and ropivacaine attenuated N-formyl-L-leucine-methionyl-L-phenylalanine-induced PAP, reduced lung edema, and diminished ET-1 release. Lidocaine and mepivacaine are more effective in reducing PAP and edema formation, but long-acting local anesthetics also inhibit ET-1 depletion and therefore have increased anti-inflammatory properties.

Topics: Acute Lung Injury; Amides; Anesthesia, Local; Animals; Anti-Inflammatory Agents; Bupivacaine; Endothelin-1; Female; Granulocytes; Lidocaine; Male; Mepivacaine; N-Formylmethionine Leucyl-Phenylalanine; Rats; Rats, Sprague-Dawley; Ropivacaine; Thromboxane A2; Vasoconstrictor Agents

This study examined the role of endothelin-1 (ET-1) in recruiting inflammatory cells to the lung after induction of injury with either lipopolysaccharide (LPS) or cigarette smoke. Hamsters injected with either ET-1 or its precursor peptide (Big ET-1) prior to treatment with LPS or cigarette smoke had markedly increased concentrations of neutrophils in bronchoalveolar lavage fluid (BALF) despite a reduction in total numbers of BALF leukocytes. Furthermore, the effect of ET-1 on smoke-exposed animals was reversed by addition of an endothelin-A receptor antagonist. These results are consistent with preferential recruitment of neutrophils by ET-1, and suggest that inhibition of this proinflammatory mediator may decrease acute pulmonary inflammation associated with cigarette smoke and other pulmonary toxins.

Topics: Acute Lung Injury; Animals; Bronchoalveolar Lavage Fluid; Cricetinae; Disease Models, Animal; Endothelin A Receptor Antagonists; Endothelin-1; Female; Lipopolysaccharides; Neutrophil Infiltration; Smoke