Generation of LexA enhancer-trap lines in Drosophila by an international scholastic network

Conditional gene regulation in Drosophila through binary expression systems like the LexA-LexAop system provides a superb tool for investigating gene and tissue function. To increase the availability of defined LexA enhancer trap insertions, we present molecular, genetic, and tissue expression studies of 301 novel Stan-X LexA enhancer traps derived from mobilization of the index SX4 line. This includes insertions into distinct loci on the X, II, and III chromosomes that were not previously associated with enhancer traps or targeted LexA constructs, an insertion into ptc, and seventeen insertions into natural transposons. A subset of enhancer traps was expressed in CNS neurons known to produce and secrete insulin, an essential regulator of growth, development, and metabolism. Fly lines described here were generated and characterized through studies by students and teachers in an international network of genetics classes at public, independent high schools, and universities serving a diversity of students, including those underrepresented in science. Thus, a unique partnership between secondary schools and university-based programs has produced and characterized novel resources in Drosophila, establishing instructional paradigms devoted to unscripted experimental science.

Nosocomial methicillin-resistant Staphylococcus aureus (MRSA) pneumonia: linezolid or vancomycin? - Comparison of pharmacology and clinical efficacy

The incidence of nosocomial pneumonia involving methicillin-resistant Staphylococcus aureus strains (MRSA) is on the rise worldwide. For years, vancomycin has been used as the drug of choice in the treatment of MRSA infections and was recommended as such by clinical guidelines. There is growing evidence that vancomycin, despite low resistance rates is a suboptimal therapeutic option in critically ill patients, particularly in patients with pneumonia. Disadvantages of vancomycin are i) slow bactericide action, ii) poor penetration into pulmonary tissue, iii) the globally slowly increasing vancomycin MICs ("creep") that result in increased clinical failure despite being susceptible according to defined break points and iv) nephrotoxicity. In contrast to other novel antibiotics with MRSA activity, Linezolid is currently approved for the treatment of nosocomial pneumonia in the USA and Europe. Several studies have compared vancomycin with linezolid for nosocomial pneumonia with conflicting results. This review compares both substances regarding pharmacodynamics, resistance, safety and clinical efficacy and discusses preliminary data of the ZEPHyR study. This study compared linezolid versus vancomycin in patients with proven MRSA pneumonia and was the largest trial ever conducted in this population.

Procalcitonin guidance and reduction of antibiotic use in acute respiratory tract infection

Increasing worldwide development of antimicrobial resistance and the association of resistance development and antibiotic overuse make it necessary to seek strategies for safely reducing antibiotic use and selection pressure. In a first step, in a non-interventional study, the antibiotic prescription rates, initial procalcitonin (PCT) levels and outcome of 702 patients presenting with acute respiratory infection at 45 primary care physicians were observed. The second part was a randomised controlled non-inferiority trial comparing standard care with PCT-guided antimicrobial treatment in 550 patients in the same setting. Antibiotics were recommended at a PCT threshold of 0.25 ng·mL(-1). Clinical overruling was permitted. The primary end-point for non-inferiority was number of days with significant health impairment after 14 days. Antibiotics were prescribed in 30.3% of enrolled patients in the non-interventional study. In the interventional study, 36.7% of patients in the control group received antibiotics as compared to 21.5% in the PCT-guided group (41.6% reduction). In the modified intention-to-treat analysis, the numbers of days with significant health impairment were similar (mean 9.04 versus 9.00 for PCT-guided and control group, respectively; difference 0.04; 95% confidence interval -0.73-0.81). This was also true after adjusting for the most important confounders. In the PCT group, advice was overruled in 36 cases. There was no significant difference in primary end-point when comparing the PCT group treated as advised, the overruled PCT group and the control group (9.008 versus 9.250 versus 9.000 days; p = 0.9605). A simple one-point PCT measurement for guiding decisions on antibiotic treatment is non-inferior to standard treatment in terms of safety, and effectively reduced the antibiotic treatment rate by 41.6%.

Predicting outcome and survival in patients with Wegener's granulomatosis treated on the intensive care unit

OBJECTIVE

This study was designed to search for risk factors predicting mortality of patients with Wegener's granulomatosis (WG) treated on the intensive care unit (ICU).

METHODS

Seventeen patients admitted to the ICU of an University Hospital for an acute illness related to WG were analysed retrospectively over 4 years. A variety of clinical and laboratory variables were recorded. Contingency table analyses, univariate logistic regression, and discriminate analysis were performed to determine which factors influenced a negative outcome.

RESULTS

Reasons for ICU admission were respiratory failure (n = 10), severe haemoptysis (n = 13), sepsis (n = 9), acute renal failure (n = 6), and gastrointestinal bleeding (n = 1). Patients were treated for a median of 6 days (range 4-121 days). During the stay in the ICU, five patients died within 24-121 days (overall mortality 29.4%). Causes of death were cerebral haemorrhage (n = 2), pulmonary embolism (n = 1), and sepsis (n = 2). Significantly associated with death were: Acute Physiology and Chronic Health Evaluation II (APACHE II) score>24 [p = 0.004, odds ratio (OR) 0.568, 95% confidence interval (CI) 0.327-0.989], period of time in the ICU>10 days (p = 0.001, OR 0.795, 95% CI 0.589-1.072), and treatment with cyclophosphamide during the stay in the ICU (p = 0.013, OR 0.799, 95% CI 0.651-0.980). No association was found for higher age, C-reactive protein (CRP), pulmonary involvement, serum creatinine, and requirement of haemodialysis.

CONCLUSIONS

The prognosis for WG patients in the ICU is serious, but the majority can survive. To achieve a more favourable outcome, patients should stay in the ICU for as short a time as possible. The occurrence of renal failure did not influence the outcome in our patients.

[Modern artificial respiration concepts in the treatment of acute respiratory distress syndrome]

In current intensive care medicine mechanical ventilation is of particular importance. In recent years new ventilation concepts have been established. Most notably, the idea of protective ventilation of patients suffering from ARDS had lasting effects in the ventilation management on these patients. In contrast to other ventilation concepts, a significant survival benefit was shown. Alternative treatment options are high-frequency-oscillatory ventilation, extracorporeal assist devices or a combination of both in order to apply an extrem small tidal volume. These alternative treatment options have never been evaluated in randomised controlled trials, so a definite statement for practical application cannot be made.

Impact of corticosteroids on the immune response to a MF59-adjuvanted influenza vaccine in elderly COPD-patients

The influence of steroids on the antibody response to a MF59-adjuvanted influenza vaccine in elderly COPD patients has not been studied previously. In the influenza season 2001/02 (October-February) elderly COPD patients were recruited at 14 doctor's offices and our 250-bed hospital. Patients were stratified into three groups according to current treatment regimen: (a) > 10 mg of prednisolone/day (SS); (b) inhaled steroids (IS); (c) no steroid treatment (control group, CG). All patients were vaccinated with the MF59-adjuvanted influenza vaccine. Antibodies against the influenza strains A/H1N1, A/H3N2, and B were measured at baseline, 4 and 24 weeks after vaccination by hemagglutination inhibition (HI) assay. One-hundred and sixty-two patients completed the study (CG n = 42; IS n = 87; SS n = 33). Mean age was 71.3 years (range 60-89). Twenty-one percent of all patients reported local reactions; no serious adverse events were observed. Four weeks after vaccination, mean geometric HI titres (GMT) for A/H1N1, A/H3N and B increased significantly in all groups (p < or = 0.05). After 24 weeks, GMTs to A/H1N1 and A/H3N2 returned to baseline, while GMTs to type B remained significantly higher than baseline in all groups. Significant differences between the groups as regards GMTs, seroconversion (56-89%) or seroprotection rates (64-93%) were not observed. Systemic steroids did not influence the antibody response towards the MF59-adjuvanted influenza vaccine. We found that the strains included in the vaccine showed varying long-term immunogenicity.

Ciprofloxacin treatment failure in a patient with resistant Streptococcus pneumoniae infection following prior ciprofloxacin therapy

Reported here is the case of a patient with underlying chronic obstructive pulmonary disease (COPD) in whom ciprofloxacin treatment of a lower respiratory tract infection failed subsequent to ciprofloxacin treatment of an exacerbation of COPD several weeks earlier. During the second course of ciprofloxacin therapy, the patient's condition continued to deteriorate, and she was admitted to the intensive care unit. Bilateral pneumonia was diagnosed. Streptococcus pneumoniae, serotype 11A, resistant to ciprofloxacin was isolated from the sputum. Sequencing revealed a S79F mutation in parC and there was evidence of an efflux pump. The patient improved rapidly after administration of azithromycin and ampicillin/sulbactam. This report of treatment failure due to ciprofloxacin-resistant Streptococcus pneumoniae shows that fluoroquinolones should be avoided when treating patients who have recently received this class of antibiotics.

Pulmonary infiltrates in Costello Syndrome

This paper reports on a patient with diffuse pulmonary infiltrates directly related to Costello Syndrome. This congenital disorder is characterised by multiple congenital abnormalities, such as psychomotor retardation, short stature, redundant skin, papillomata, curly hair, relative macroencephaly, distinctive face and various defects of internal organs. This study is the first to document the histopathological findings in the lungs. Most conspicuous was the depositing of abnormal collagen and elastic fibres and the development of endogenous lipid pneumonia.

Reduced spontaneous apoptosis in peripheral blood neutrophils during exacerbation of COPD

A major feature of acute exacerbation of chronic obstructive pulmonary disease (COPD) is the accumulation of activated neutrophils in the bronchial tree. This phenomenon can be explained by an increased migration and/or by a prolonged survival due to an inhibition of spontaneous apoptosis. The aim of this study was to assess the apoptotic behaviour of peripheral blood neutrophils in COPD patients during an acute exacerbation. Thirty-six hospitalised COPD patients with an acute exacerbation and 10 healthy volunteers were included. Blood samples were obtained at admission, after 3-5 days and at discharge. Spontaneous apoptosis of isolated neutrophils was measured based on Annexin V-PE binding and nuclear morphology after culturing for 18 h. At admission, significantly lower rates of spontaneous apoptosis were noted in COPD patients compared with healthy volunteers (mean +/- SD 31 +/- 13% versus 44 +/- 18%). The mean percentages of apoptotic neutrophils were 31 +/- 13% at admission, 39 +/- 15% after 3-5 days and 47 +/- 18% at discharge. There was a statistically significant difference between the rates of spontaneous apoptosis on the first day and at discharge. Neither forced expiratory volume in one second < 35% predicted, smoking habit, corticosteroid therapy nor evidence of bacterial infection showed any influence on the spontaneous apoptosis in this study. In conclusion, during acute exacerbations of chronic obstructive pulmonary disease, neutrophil granulocytes show a reduced spontaneous apoptosis that increases progressively after treatment and clinical remission. This raises the question of the importance of neutrophil apoptosis in the development and resolution of exacerbations of chronic obstructive pulmonary disease.

Diagnose eines Multiplen Myeloms durch den Nachweis von Plasmazellen in der bronchoalveolären Lavage

HISTORY AND CLINICAL FINDINGS

A 61-year-old man was transferred from a peripheral hospital with the diagnosis of interstitial lung disease and an unclear mediastinal tumour. At the time of admission the patient had congestive heart disease NYHA class IV.

INVESTIGATIONS

The echocardiogram showed a small left ventricle with concentric hypertrophy and a left ventricular ejection fraction of 35 %. The myocardium was relatively echo-rich with solid structures inside. Chest X-ray showed a massive rightsided pleural effusion. The abdominal ultrasound demonstrated ascites and hepatomegaly. The bronchoalveolar lavage showed an increased part of CD3 negative and CD16/CD56 positive cells, which were identified as plasma cells by light and electron microscopy. Aspiration and investigation of the bone marrow verified the diagnosis of a IgG multiple myeloma, highly differentiated characterised by monoclonal expression of light-lambda chains. Additionally Bence-Jones-proteins were found in the urine and osteolysis in the x-ray of the skull and the humerus.

DIAGNOSIS

Multiple myeloma, IgG-lambda, stage IIA.

THERAPY AND CLINICAL COURSE

Chemotherapy with prednisolone and melphalan was initiated. His general condition increased after administration of the first cycle of chemotherapy.

CONCLUSION

Cardiopulmonary involvement is seldom seen in multiple myeloma but should be excluded when clinical symptoms are present.

Effect of calcium carbonate on bioavailability of orally administered gemifloxacin

We investigated the effect of calcium carbonate on the oral bioavailability of gemifloxacin. Gemifloxacin was administered alone, 2 h before, simultaneously, or 2 h after calcium carbonate in 16 volunteers. Data for 320 mg of gemifloxacin alone were as follows: maximum concentration of drug in serum (C(max)),13 microg/ml; half-life, 7.33 h; and area under the concentration-time curve from 0 h to infinity (AUC( infinity )), 6.79 microg. h/ml. Only simultaneous coadministration of calcium carbonate reduced C(max) (-17%) and AUC( infinity ) (-21%) significantly.

ABT-773: pharmacokinetics and interactions with ranitidine and sucralfate

We assessed the pharmacokinetics and interaction of ABT-773 in 12 volunteers receiving ABT-773 alone or concomitantly with ranitidine or sucralfate. Data for 150 mg of ABT-773 were as follows: the maximum concentration of the drug in plasma (C(max)) was 318 ng/ml, its half-life was 5.66 h, and its area under the plasma concentration-time curve from 0 h to infinity (AUC(0- infinity )) was 1,662 ng. h/ml. Coadministration of ranitidine, reduced the C(max) (-25.7%) and AUC(0- infinity ) (-15.8%) significantly. Sucralfate had no impact on the bioavailability of ABT-773.

Cerebriform nodular amelanotic metastases of malignant melanoma: a challenge in differential diagnosis of a rare variant

High variability of the clinical appearance of malignant melanoma (MM) and its metastases render the differential diagnosis of solid amelanotic tumours difficult. We report a 71-year-old woman with several unusual cutaneous tumours of cerebriform morphology, suggesting skin metastases from occult internal cancer. Histopathological findings and thorough investigations, however, revealed a late-stage metastatic MM. We discuss the differential diagnosis of skin metastases of various origin and underline the difficulties for early detection of MM.