An LRP8 variant is associated with familial and premature coronary artery disease and myocardial infarction

Our previous genomewide linkage scan of 428 nuclear families (GeneQuest) identified a significant genetic susceptibility locus for premature myocardial infarction (MI) on chromosome 1p34-36. We analyzed candidate genes in the locus with a population-based association study involving probands with premature coronary artery disease (CAD) and/or MI from the GeneQuest families (381 cases) and 560 controls without stenosis detectable by coronary angiography. A nonconservative substitution, R952Q, in LRP8 was significantly associated with susceptibility to premature CAD and/or MI by use of both population-based and family-based designs. Three additional white populations were used for follow-up replication studies: another independent cohort of CAD- and/or MI-affected families (GeneQuest II: 441 individuals from 22 pedigrees), an Italian cohort with familial MI (248 cases) and 308 Italian controls, and a separate Cleveland GeneBank cohort with sporadic MI (1,231 cases) and 560 controls. The association was significantly replicated in two independent populations with a family history of CAD and/or MI, the GeneQuest II family-based replication cohort and the Italian cohort, but not in the population with sporadic disease. The R952Q variant of LRP8 increased activation of p38 mitogen-activated protein kinase by oxidized low-density lipoprotein. This extensive study, involving multiple independent populations, provides the first evidence that genetic variants in LRP8 may contribute to the development of premature and familial CAD and MI.

Factors associated with lack of interest in HIV testing in older at-risk women

OBJECTIVE

To determine the factors and reasons associated with lack of interest in HIV testing among older women from a high prevalence community.

METHODS

We conducted a cross-sectional study of women aged >or=50 seeking medical care. The main outcome measures were (1) interest in HIV testing and (2) reasons for women's interest or lack of interest assessed using open-ended questions. We compared the characteristics of women based on testing interest and fit two multivariable logistic regression models to identify factors associated with lack of testing interest among never tested women and women with moderate or high HIV risk factors. Responses to short answer questions were analyzed according to participants' HIV testing interest. Coding was performed by two independent reviewers using deductive application of themes identified in previously published literature on HIV testing interest.

RESULTS

Of 564 eligible women, 514 (91%) enrolled. Only 22% were interested in HIV testing. Those who lacked interest were more likely to be older (63.3 vs. 58.4, p < 0.001), African American (77% vs. 60%, p < 0.001), have poor HIV knowledge (68% vs. 57%, p = 0.02), and have low perceived HIV risk (82% vs. 69%, p = 0.01). Lack of interest in HIV testing was associated with increasing age and African American race among women with moderate or high-risk factors, whereas age, African American race and low perceived risk were important for never tested women. Common reasons for lacking interest in testing were perceived lack of need, perceived lack of risk, and a prior history of HIV testing.

CONCLUSIONS

Few of these older, high-risk women were interested in HIV testing despite the fact that more than half had risk factors for having been exposed to HIV during their life-time. Efforts to increase HIV testing interest should educate older women about HIV risk and transmission factors and promote accurate risk self-assessment.

So what is so good about clinical experience? A mental health nursing perspective

The available literature suggests that undergraduate nursing students generally do not have positive attitudes towards working in the mental health field but that clinical experience is the most important factor influencing the development of a more favourable outlook. Despite this there is very little attention paid to the factors that contribute to a positive clinical experience. The aim of this paper is to examine the level of, and factors contributing to, undergraduate nursing students' satisfaction with clinical experience. A survey was administered to undergraduate nursing students (n=146). The findings support the available literature in suggesting that the provision of support and the ability to become actively involved in patient care are the two most important factors affecting the perceived quality of clinical placements. However, this study contradicts the findings of earlier research in demonstrating a higher degree of satisfaction with clinical experience in inpatient settings. This reflected the view that there was less opportunity for patient care involvement within the community environment. Given the increased emphasis on community care, it is important that students are actively engaged in the care and treatment process in order that they have the opportunity to meet learning objectives in the mental health field.

Impact of theory and clinical placement on undergraduate students' mental health nursing knowledge, skills, and attitudes

Mental health issues are common and contemporary nursing students need to be well prepared to meet the mental health care needs of Australians. This study explored the influence of the mental health component of a Bachelor of Nursing course on second-year undergraduate nursing students' self-reported knowledge, skills, and attitudes in relation to mental health nursing. The study used a quasiexperimental research design involving questionnaires and individual interviews to determine nursing students' self-reported knowledge, skills, attitudes. Questionnaires were administered prior to undertaking the mental health theory, repeated prior to undertaking a clinical placement in either a community or inpatient mental health setting, and again after the clinical placement. The findings of the study indicated that a positive clinical placement had the greatest influence on nursing students' self-reported knowledge, skills, and attitudes and interest in nursing people experiencing mental health problems; however, the quantity of theoretical education also emerged as an influencing variable.

N-sulfonato-N,O-carboxymethylchitosan: A novel polymeric absorption enhancer for the oral delivery of macromolecules

Chitosan has been shown to act on the mucosal epithelial barriers mainly when protonated at acidic pH values in which it is soluble. Soluble chitosan is able to improve the permeation and absorption of neutral to cationic macromolecules only, as it forms polyelectrolyte complexes with anionic macromolecules. LMWH (Low Molecular Weight Heparin) is an anionic polysaccharide finding clinical application as an improved antithrombotic agent compared to Unfractionated Heparin (UFH). In this study we have employed N-sulfonato-N,O-carboxymethylchitosan (SNOCC) as a potential intestinal absorption enhancer of LMWH, Reviparin. SNOCC was prepared at 3 different viscosity grades 20, 40 and 60 cps and identified as SNOCC-20, SNOCC-40 and SNOCC-60, respectively. SNOCC materials were tested in vitro for their ability to decrease the Trans Epithelial Electrical Resistance (TEER) of Caco-2 cell monolayers. They were further tested as transport enhancers of hydrophilic compounds such as (14)C-mannitol, FITC-Dextran (MW 4400 Da) and Reviparin (LMWH). Solutions of Reviparin, with or without SNOCC, were administered intraduodenally in vivo in rats and the absorption of the drug was assessed by measuring the Anti-Xa levels in rat plasma. In vitro studies showed that SNOCC materials were able to induce a concentration dependent decrease in the TEER of the Caco-2 monolayers. SNOCC-40 and -60 were shown to decrease resistance more readily compared to the low viscosity SNOCC-20. (14)C-mannitol permeation data across intestinal epithelia were in agreement with the observed decrease in TEER; the higher viscosity SNOCC-60 was the most effective demonstrating a 51-fold enhancement of the permeation of the radiolabeled marker. Studies with both FITC-Dextran and Reviparin demonstrated significantly increased permeation across Caco-2 cell monolayers when they were co-incubated at the apical side of the monolayer. Intestinal absorption of Reviparin in rats was increased when it was co-administered with SNOCC-40 and -60, in agreement with in vitro data. Anti-Xa levels were elevated to and above the antithrombotic levels and were sustained for at least 6 h, giving an 18.5-fold increase in the AUC of LMWH in rats. In conclusion, SNOCC-40 and -60 have been shown to enhance both permeation and absorption of Reviparin across intestinal epithelia proving their potential as polymeric absorption enhancers.

Brachyury, a crucial regulator of notochordal development, is a novel biomarker for chordomas

Chordomas are malignant tumours that occur along the spine and are thought to derive from notochordal remnants. There is significant morphological variability between and within chordomas, with some showing prominent areas of chondroid differentiation. Our microarray data from a broad range of connective tissue neoplasms indicate that, at the transcriptional level, chordomas resemble cartilaginous neoplasms. Here we show that chordomas express many genes known to be involved in cartilage development, but they also uniquely express genes distinguishing them from chondroid neoplasms. The brachyury transcription factor, known to be involved in notochordal development, is only expressed by chordomas. Using a polyclonal antibody, we show that brachyury is expressed in the embryonic notochord and in all 53 chordomas analysed, labelling both chondroid and chordoid areas of these tumours. In contrast, the protein was not detected in over 300 neoplasms, including 163 chondroid tumours. Brachyury was not detected in the nucleus pulposus, arguing against the hypothesis that this tissue derives directly from the notochord. These data provide compelling evidence that chordomas derive from notochord and demonstrate that brachyury is a specific marker for the notochord and notochord-derived tumours.

The Life Tape Project, an existential intervention for cancer patients: A report on perceived benefits and changes in quality of life

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Background: Facing cancer, most patients struggle with mortality and threats to their emotional equilibrium and that of their families. Families may become closer, but often communication difficulties and isolation increase. The Life Tape Project (LTP) is an intervention—involving a two hour video-taped genealogy and life story in the presence of family—designed to help patients and families confront this existential crisis. An important aspect is the cultivation of Symbolic Immortality—that some important part of the person continues to exist symbolically, even after death—helping patients identify with things greater and more enduring than themselves, and providing a sense of what will remain with the family after they are gone. Observation and pilot data suggested patients receive substantial benefits from the LTP. Results from an ongoing study designed to quantify and extend these observations are reported. Method: Adults with any cancer diagnosis are recruited from the general population. Patients complete baseline questionnaires before the LT interview and follow-up packets two and ten weeks after. Measures include the FACT-G for Quality of Life (QOL) and a Perceived Benefits Questionnaire covering eight themes suggested by previous research. A final semi-structured interview probes for unwanted effects. Results: At first follow-up (N = 23 as of 1/8/06) repeated measure t-tests revealed significant increases in FACT-G Functional and QOL (Total) scales; and a majority of patients reported substantial benefits (endorsing “very” or “extremely true for me”) in at least one theme. Final interviews revealed no unwanted effects. Conclusions: The LTP is a powerful, safe, and accessible intervention that can improve family communication and connectedness, promote personal growth, and reduce existential anxiety through the creation of symbolic immortality. Requiring minimal equipment and time, it would make an excellent addition to any supportive care program.

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No significant financial relationships to disclose.

Effect of Relationship Factors on Safer Sex Decisions in Older Inner-City Women

OBJECTIVES

Heterosexual transmission of the human immunodeficiency virus (HIV) in older women is on the rise, yet little is known about safer sex practices in these women. We sought to determine the prevalence of and effect of relationship factors on safer sex practices among older women living in a high HIV incidence region.

METHODS

In a cross-sectional study at an ambulatory medicine clinic of a large inner-city hospital, participants were women over age 50 seeking medical services at the study site. Measurements included (1) partner trust, (2) dependence on partner, (3) personally obtaining condoms, (4) safer sex (frequent condom use or abstinence), (5) knowledge of condom efficacy, and (6) perceived HIV risk.

RESULTS

Of 155 participants in a current relationship, 81% were sexually active; however, only 13% of these women used condoms frequently. No significant differences were found between participants who did and did not practice safer sex with respect to their age, race, employment, marital status, knowledge of condom efficacy, or perceived HIV risk. Trust in partner was independently associated with lower odds of safer sex (OR 0.3, 95% CI 0.08-1.06). Personally obtaining condoms (OR 9.2, 95% CI 1.9-44.2) and dependence on partner for condoms (OR 12.3, 95% CI 3.0-50.3) were independently associated with higher odds of safer sex. CONCLUSIONS. Few older women in high HIV incidence areas practice safer sex. Relationship factors impact the risk of acquiring HIV through safer sex decisions. HIV prevention messages geared to older women should incorporate references to the role these factors can play in reducing their HIV risk.

Does a Post-take Ward Round Proforma Lead to Sustainable Improvements in Quality of Documentation for Patients Admitted to the Medical Assessment Unit?

This study assessed the quality of post-take ward round (PTWR) documentation, specifically looking at twelve criteria, in the medical assessment unit (MAU) prior to, 3- months and 2-years after introducing a PTWR proforma. 216 case records were analysed; 40 prior to, 40 three-months and 146 two-years after introducing the PTWR proforma. There was a significant improvement in eight criteria threemonths after introducing the PTWR proforma. These improvements were sustained two-years later and significant improvements made in a further 3 criteria (1 at p < 0.05 and 2 at p ) 0.01).

Proposal for molecular mechanism of thionins deduced from physico-chemical studies of plant toxins

We propose a molecular model for phospholipid membrane lysis by the ubiquitous plant toxins called thionins. Membrane lysis constitutes the first major effect exerted by these toxins that initiates a cascade of cytoplasmic events leading to cell death. X-ray crystallography, solution nuclear magnetic resonance (NMR) studies, small angle X-ray scattering and fluorescence spectroscopy provide evidence for the mechanism of membrane lysis. In the crystal structures of two thionins in the family, alpha(1)- and beta-purothionins (MW: approximately 4.8 kDa), a phosphate ion and a glycerol molecule are modeled bound to the protein. (31)P NMR experiments on the desalted toxins confirm phosphate-ion binding in solution. Evidence also comes from phospholipid partition experiments with radiolabeled toxins and with fluorescent phospholipids. This data permit a model of the phospholipid-protein complex to be built. Further, NMR experiments, one-dimensional (1D)- and two-dimensional (2D)-total correlation spectroscopy (TOCSY), carried out on the model compounds glycerol-3-phosphate (G3P) and short chain phospholipids, supported the predicted mode of phospholipid binding. The toxins' high positive charge, which renders them extremely soluble (>300 mg/mL), and the phospholipid-binding specificity suggest the toxin-membrane interaction is mediated by binding to patches of negatively charged phospholipids [phosphatidic acid (PA) or phosphatidyl serine (PS)] and their subsequent withdrawal. The formation of proteolipid complexes causes solubilization of the membrane and its lysis. The model suggests that the oligomerization may play a role in toxin's activation process and provides insight into the structural principles of protein-membrane interactions.

Predicting biomarkers for ovarian cancer using gene-expression microarrays

Ovarian cancer has the highest mortality rate of gynaecological cancers. This is partly due to the lack of effective screening markers. Here, we used oligonucleotide microarrays complementary to ∼12 000 genes to establish a gene-expression microarray (GEM) profile for normal ovarian tissue, as compared to stage III ovarian serous adenocarcinoma and omental metastases from the same individuals. We found that the GEM profiles of the primary and secondary tumours from the same individuals were essentially alike, reflecting the fact that these tumours had already metastasised and acquired the metastatic phenotype. We have identified a novel biomarker, mammaglobin-2 (MGB2), which is highly expressed specific to ovarian cancer. MGB2, in combination with other putative markers identified here, could have the potential for screening.

Gene expression array profile of human osteosarcoma

The aims of this pilot study were to determine whether needle and open biopsies from osteosarcoma (OS) provide sufficient quality of mRNA for cDNA array analyses to gain insights into the expression profile of OS. A total of 22 samples collected from OS were used for array analyses. A primary cell culture was also established from one of the OS biopsies. Total RNA was extracted and probes were generated for cDNA arrays. cDNA probes were made for all the 22 samples. Two of these samples were needle core bone biopsies. Statistical analysis confirmed the reliability of array data obtained in 16 of the 22 samples. Known genes involved in bone metabolism and osteosarcoma were identified as highly expressed, and the putative new marker Ezrin was also identified. Confirmatory immunohistochemical staining using the Ezrin antibody was performed in a selection of samples.