Altered Cell-Cycle Control, Inflammation, and Adhesion in High-Risk Persistent Bronchial Dysplasia

Persistent bronchial dysplasia is associated with increased risk of developing invasive squamous cell carcinoma (SCC) of the lung. In this study, we hypothesized that differences in gene expression profiles between persistent and regressive bronchial dysplasia would identify cellular processes that underlie progression to SCC. RNA expression arrays comparing baseline biopsies from 32 bronchial sites that persisted/progressed to 31 regressive sites showed 395 differentially expressed genes [ANOVA, FDR ≤ 0.05). Thirty-one pathways showed significantly altered activity between the two groups, many of which were associated with cell-cycle control and proliferation, inflammation, or epithelial differentiation/cell-cell adhesion. Cultured persistent bronchial dysplasia cells exhibited increased expression of Polo-like kinase 1 (PLK1), which was associated with multiple cell-cycle pathways. Treatment with PLK1 inhibitor induced apoptosis and G2-M arrest and decreased proliferation compared with untreated cells; these effects were not seen in normal or regressive bronchial dysplasia cultures. Inflammatory pathway activity was decreased in persistent bronchial dysplasia, and the presence of an inflammatory infiltrate was more common in regressive bronchial dysplasia. Regressive bronchial dysplasia was also associated with trends toward overall increases in macrophages and T lymphocytes and altered polarization of these inflammatory cell subsets. Increased desmoglein 3 and plakoglobin expression was associated with higher grade and persistence of bronchial dysplasia. These results identify alterations in the persistent subset of bronchial dysplasia that are associated with high risk for progression to invasive SCC. These alterations may serve as strong markers of risk and as effective targets for lung cancer prevention.Significance: Gene expression profiling of high-risk persistent bronchial dysplasia reveals changes in cell-cycle control, inflammatory activity, and epithelial differentiation/cell-cell adhesion that may underlie progression to invasive SCC. Cancer Res; 78(17); 4971-83. ©2018 AACR.

The director of medical informatics: a new physician leader for IT initiatives

Integrated delivery systems (IDSs) recently have invested substantial financial resources in information technology (IT) initiatives. But the return on that investment for many IDSs in terms of improved productivity and reduced costs has been less than anticipated. Therefore, to improve or enhance the success of IT initiatives, some IDSs have sought to encourage more physician support of such efforts by creating a new executive position--director of medical informatics--designed to be filled by physician leaders who have knowledge and skill in managing information systems. The director of medical informatics, who typically reports to the CEO or CIO, coordinates IT initiatives that address physician concerns and promotes physician buy-in.

Medicare on the critical list. Understanding the etiology of the disease will help in the search for a cure

Medicare, and its companion program Medicaid, came into being as part of Lyndon Johnson's Great Society. Their purpose was to provide the elderly with equal access to high-quality medical care. Though the goals were laudable, the magnitude of the costs and of the effects was unforeseen. As the two programs made medical care available to a large segment of the population, the demand grew. At the same time, private industry became more generous with its health insurance plans. Because of their emphasis on hospital care, the governmental and private industry plans helped push hospital prices up. Now that both sectors are finding the cost of medical care unacceptably high, Congress is proposing remedial legislation and corporations are trying alternative health care plans. These authors explore how well the maladies of Medicare may respond to the various cures that are being proposed.

Quantitation of proteins on Coomassie blue-stained polyacrylamide gels based on spectrophotometric determination of electroeluted dye

A procedure for quantitating proteins on Coomassie blue-stained polyacrylamide gels is presented. The method is based on the observations that the dye is rapidly eluted electrophoretically from stained protein bands or spots in the presence of sodium dodecyl sulfate, and that the eluted dye is nondialyzable. Protein may therefore be assayed indirectly by measuring the dye in electroeluents spectrophotometrically. Moreover, the stain elutes more rapidly than the protein, allowing separate recovery of the protein for further analysis. The assay is independent of band or spot size, and does not involve physical disruption of the gel piece or any chemical treatment harsher than the staining process itself. The technique has been applied to the contractile proteins myosin, actin, and commercially obtained standards resolved by one-dimensional electrophoresis, and to proteins in nuclear extracts of HeLa cells on two-dimensional gels.

Effects of 20,25-diazacholesterol on cholesterol synthesis in cultured chick muscle cells: a radiogas chromatographic and mass spectrometric study of the post-squalene sector

Radiogas chromatography, used in conjunction with mass spectrometry, has been used to analyze the sterol content of cultured chick muscle cells. Seven sterols, plus lanosterol, were detected. These sterols conformed to a linear biosynthetic pathway linking lanosterol and cholesterol. The reaction sequence is: C-14 demethylation, C-4 demethylation, delta 8 leads to delta 5 double bond rearrangement, delta 24 double bond reduction. When chick cells were treated with increasing concentrations of 20,25-diazacholesterol, components of this pathway and aberrant products accumulated. These accumulations suggest that diazacholesterol affects reductases, double bond isomerases and the C-14 demethylation enzymes of sterol biosynthesis.

Politics, social welfare policy, and the population problem in Latin America

This paper examines the interaction between social welfare policies and the "population problem" in Latin America. It demonstrates that social security programs, by reinforcing highly unequal patterns of stratification, have had a largely negative effect on population issues in the region. Social security policy in turn is analyzed as a particular political adaptation to the realities of dependent capitalist development. As a result, the population problem in Latin America is viewed less as a product of mindless demographic forces than as a politically induced reality stemming from the accumulated impact and negative consequences of a variety of consciously formulated public policies.

Radiogas chromatography mass spectrometry in the selected ion monitoring mode

The value of selected ion monitoring in analyzing biological radio isotope incorporation experiments by radiogas chromatography mass spectrometry is illustrated with reference to the biosynthesis of the mycotoxin mycophenolic acid and the mode of action of the anticholesterolemic drug 20,25-diazacholesterol. It is shown that the increased sensitivity and specificity of the selected ion monitoring mode detector permits straightforward detection and identification of the relatively small cellular pools associated with metabolic intermediates. The computer program RADSIM is described. Problems that still exist in using radiogas gas chromatography mass spectrometry technology to analyse isotope incorporation experiments are discussed.