Induction of Heme Oxygenase-1, Biliverdin Reductase and H-Ferritin in Lung Macrophage in Smokers with Primary Spontaneous Pneumothorax: Role of HIF-1α

Few data concern the pathophysiology of primary spontaneous pneumothorax (PSP), which is associated with alveolar hypoxia/reoxygenation. This study tested the hypothesis that PSP is associated with oxidative stress in lung macrophages. We analysed expression of the oxidative stress marker 4-HNE; the antioxidant and anti-inflammatory proteins heme oxygenase-1 (HO-1), biliverdin reductase (BVR) and heavy chain of ferritin (H-ferritin); and the transcription factors controlling their expression Nrf2 and HIF-1alpha, in lung samples from smoker and nonsmoker patients with PSP (PSP-S and PSP-NS), cigarette smoke being a risk factor of recurrence of the disease.mRNA was assessed by RT-PCR and proteins by western blot, immunohistochemistry and confocal laser analysis. 4-HNE, HO-1, BVR and H-ferritin were increased in macrophages from PSP-S as compared to PSP-NS and controls (C). HO-1 increase was associated with increased expression of HIF-1alpha mRNA and protein in alveolar macrophages in PSP-S patients, whereas Nrf2 was not modified. To understand the regulation of HO-1, BVR and H-ferritin, THP-1 macrophages were exposed to conditions mimicking conditions in C, PSP-S and PSP-NS patients: cigarette smoke condensate (CS) or air exposure followed or not by hypoxia/reoxygenation. Silencing RNA experiments confirmed that HIF-1alpha nuclear translocation was responsible for HO-1, BVR and H-ferritin induction mediated by CS and hypoxia/reoxygenation.PSP in smokers is associated with lung macrophage oxidative stress. The response to this condition involves HIF-1alpha-mediated induction of HO-1, BVR and H-ferritin

Perceived managerial and leadership effectiveness in UAE and Egypt: a comparison through the combined lenses of Islamic work ethics and Islamic leadership

Despite the increasing awareness that societal, sectorial, and organizational variables have a significant impact on manager and employee behavior, most studies in Asian and Middle Eastern (ME) countries, whether conducted by Western or indigenous scholars, continue to be informed by frameworks derived from the United States (US), Canada, or Western European countries (Leung, 2007; Li, 2012; Tsui, 2006) . This approach is problematic because the insights gleaned from such studies may fall only within Western theoretical constructs (Tsui, 2007; see also Shahin & Wright, 2004), thereby compromising insights regarding novel country-specific phenomena and the development of indigenous management/leadership knowledge. Consequently, many scholars (Rosenzweig, 1994; Rousseau & Fried, 2001) have called for the generation of indigenous management theories based on local conditions and socio-cultural factors, and for indigenous management and leadership research within non-Western countries (see Holtbrugge, 2013; Wolfgramm, Spiller & Voyageur, 2014; Shahin & Wright, 2004). This call is also pertinent for ME countries, where there is generally a paucity of indigenous management/leadership research and more specifically, of inductive emic (context-specific

Alveolar epithelial permeability in patients with primary spontaneous pneumothorax as determined by Tc-99m DTPA aerosol scintigraphy

Purpose: Primary spontaneous pneumothorax (PSP) occurs subsequent to a disruption in the continuity of visceral pleura and escape of air into the pleural space. The cause of PSP is most often the rupture of subpleural blebs or bullae. It is usually difficult to detect evidence of pulmonary pathology. The purposes of the present study were (1) to investigate the changes of pulmonary alveolar epithelial permeability in patients with PSP as determined by Tc-99m DTPA aerosol lung scintigraphy, (2) to assess whether or not some differences exist between apical and basal parts of the lungs, and (3) to determine the relationship between the clearance rate of Tc-99m DTPA and the PFT results, the recurrence rate of PSP, and the percentage of pneumothorax in affected lung. Material and Methods: Thirteen PSP patients (two females, 11 males; mean age 32.5 +/- 11.8 years) with normal chest X-ray were studied. Thirteen healthy non-smoking volunteers (1 female, 12 males; mean age, 35.8 +/- 10 years) were selected as a control group. Tc-99m DTPA aerosol lung scintigraphy and PFT were performed in all patients and controls. Clearance rates (%/min) of Tc-99m DTPA aerosol in right and left lung field, and apical and basal parts of each lung were calculated from dynamic images for 15 min. Results: There was no significant difference (p > 0.05) between patients and controls, or between apical and basal parts of each lung. No correlation was found between the clearance rate of Tc-99m DTPA and PFT results, the recurrence rate of PSP, or the percentage of pneumothorax. Conclusion: This study demonstrates that pulmonary epithelial permeability is not altered in PSP patients; the clearance rate of Tc-99m DTPA shows no difference between apical and basal parts of each lung

THE PREDICTORS OF LONG-TERM SURVIVAL AND MORTALITY IN PATIENTS WITH COPD TREATED WITH MECHANICAL VENTILATION

[Abstract Not Available

Treatment of a primary pulmonary alveolar proteinosis case with severe hypoxaemia by using segmental lavage technique [1]

[No abstract available

Comparison with clearance of Tc-99m DTPA aerosol, and CO diffusing capacity, and lung function test in house painters

[Abstract Not Available

A prospective, multicentre clinical trial comparing cisplatin plus gemcitabine with cisplatin plus etoposide in patients with locally advanced and metastatic non-small cell lung cancer

WOS: 000235842800008PubMed ID: 16135168Cisplatin-gemcitabine (PG) and cisplatin-etoposide (PE) combinations are active regimens for non-small cell lung cancer (NSCLC). The present study aimed to compare PG with PE in the treatment of patients with stage IIIB and IV NSCLC. We conducted a prospective, multicentre trial. A total of 166 patients were enrolled into the study and received either gemcitabine (1000 mg/m(2)) on days 1, 8 and 15 plus cisplatin (80 mg/m(2)) on day 2 every 4 weeks, or etoposide (100 mg/m(2)) on days 1, 2 and 3 plus cisplatin (80 mg/m(2)) on day 1 every 3 weeks. The overall response rate was superior in the PG group (54.8%vs 39.0%, P = 0.045). There was no significant difference in survival between the two groups, with respective median and 1-year survival of 38 weeks and 33.3% for the PG group, and 34 weeks and 23.2% for the PE group. There was also no statistical difference for time to progression between the two groups. Neutropenia and thrombocytopenia were seen more frequently in the PG group (grade 3 neutropenia, 33.3%vs 15.9%, P = 0.012; grade 3 thrombocytopenia, 27.4%vs 3.7%, P < 0.001 and grade 4 thrombocytopenia, 10.7%vs 1.2%, P = 0.018). PG is an active chemotherapy regimen and has a better response rate than PE in advanced NSCLC, although there was no difference in time to progression and overall survival. A higher incidence of haematological toxicity was seen with PG than with PE