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Biomedical subjects

K Petrie

Publications and source records attributed to K Petrie.

At least 19 recordsLinked to original sources

Histone deacetylase inhibitors in APL and beyond.

In recent years the study of chemical modifications to chromatin and their effects on cellular processes has become increasingly important in the field of cancer research. Disruptions to the normal epigenetic pattern of the cell can serve as biomarkers and are important determinants of cancer progression. Accordingly, drugs that inhibit the enzymes responsible for modulating these epigenetic markers, in particular histone deacetylases, are the focus of intense research and development. In this chapter we provide an overview of class I and II histone deacetylases as well as a guide to the diverse types of histone deacetylase inhibitors and their activities in the context of APL. We also discuss the rationale for the use of histone deacetylase inhibitors in combination therapy for the treatment of cancer and the current status of clinical trials.

Animals↗

Stereotyping the smoker: adolescents' appraisals of smokers in film.

OBJECTIVE: To assess the relation between demographic factors and film smoking stereotypes in adolescents and the potential influence of smoker stereotypes on smoking susceptibility. DESIGN: A cross sectional questionnaire survey of school students (n = 3041) aged 12-13 and 16-17 years who were asked to describe the personal characteristics of female and male smokers in films. SETTING: 15 primary or intermediate schools and 10 secondary schools in Auckland, New Zealand. RESULTS: Appraisals of smokers in film were strongly influenced by age and sex with younger adolescents and males more likely to see female smokers as sexy, intelligent and healthy whereas older students and females more often appraised female smokers as stressed bored and depressed. Overall, image stereotypes (sexy, stylish) were more likely to be significantly associated with smoking susceptibility than emotional sensitivity stereotypes (stressed, depressed etc). CONCLUSIONS: Adolescents differ significantly in their appraisal of smokers in films; however, image based stereotypes, rather than emotional sensitivity stereotypes, are significantly associated with smoking susceptibility.

Adolescent↗

Lineage restriction of the RARalpha gene expression in myeloid differentiation.

To better understand the role of retinoids in myelopoiesis, expression of the retinoid receptor genes (retinoic acid receptors [RARs] and retinoid X receptors [RXRs]) were examined during differentiation of factor-dependent cell-Paterson (FDCP)-mixA4 murine progenitor cells. The major receptor expressed in undifferentiated A4 cells was RARalpha (primarily the RARalpha1 isoform). Following induction of myelomonocytic differentiation with granulocyte and granulocyte-macrophage colony-stimulating factors, a dramatic increase in RARalpha expression (particularly the RARalpha2 isoform) was seen. In contrast, expression of both RARalpha isoforms was rapidly extinguished upon induction of erythroid differentiation with erythropoeitin (EPO). A modest induction of RXRalpha expression was seen, particularly during differentiation in the myelomonocytic lineage. Low expression levels of RARgamma2 and RXRbeta remained unchanged, irrespective of differentiation pathway. Consistent with the gene expression patterns, RARalpha agonists and antagonists stimulated myelomonocytic and erythroid differentiation of FDCP-mixA4 cells, respectively. Taken together, these results suggest that erythropoiesis and granulopoiesis require diminished and enhanced RARalpha activities, respectively, which at physiological all-trans-retinoic acid (RA) concentrations may be accomplished by reciprocal effects of EPO and myelomonocytic growth factors on its expression. This hypothesis is corroborated by data showing that RA, which positively regulates RARalpha2 expression, can exert inhibitory effects on erythroid differentiation.

Bone Marrow↗

Recruitment of the nuclear receptor corepressor N-CoR by the TEL moiety of the childhood leukemia-associated TEL-AML1 oncoprotein.

The t(12;21)(p13;q22) chromosomal translocation is the most frequent illegitimate gene recombination in a pediatric cancer and occurs in approximately 25% of common acute lymphoblastic leukemia (cALL) cases. This rearrangement results in the in frame fusion of the 5'-region of the ETS-related gene, TEL (ETV6), to almost the entire acute myeloid leukemia 1 (AML1) (also called CBFA2 or PEBP2AB1) locus and expression of the TEL-AML1 chimeric protein. Although AML1 stimulates transcription, TEL-AML1 functions as a repressor of some AML1 target genes. In contrast to the wild type AML1 protein, both TEL and TEL-AML1 interact with N-CoR, a component of the nuclear receptor corepressor complex with histone deacetylase activity. The interaction between TEL and N-CoR requires the central region of TEL, which is retained in TEL-AML1, and TEL lacking this domain is impaired in transcriptional repression. Taken together, our results suggest that TEL-AML1 may contribute to leukemogenesis by recruiting N-CoR to AML1 target genes and thus imposing an altered pattern of their expression.

Core Binding Factor Alpha 2 Subunit↗

Patients' interpretation of symptoms as a cause of delay in reaching hospital during acute myocardial infarction.

OBJECTIVE: To examine whether the association between expected symptoms of acute myocardial infarction and actual symptoms predicted delay in reaching hospital and help seeking behaviour. DESIGN: During hospital convalescence, participants completed a structured interview designed to measure symptom experience and help seeking behaviour following the onset of symptoms of acute myocardial infarction. PATIENTS: 88 patients admitted to hospital with their first myocardial infarction MAIN OUTCOME MEASURES: Delay in reaching hospital from onset of worst symptoms, obtained from ambulance and hospital records. RESULTS: The most common symptoms expected by patients with myocardial infarction were central chest pain (76%), radiating arm or shoulder pain (34%), and collapse (26%). The most common symptoms experienced were sweats or feeling feverish (78%), chest pain (64%), and arm, shoulder, or radiating pain (66%). A mismatch between symptoms experienced and those expected occurred in 58% of patients, and was associated with delay. Patients who experienced a mismatch between expectation and actual symptoms also were more likely to have a third party decide to call for help. CONCLUSIONS: The experience and interpretation of symptoms is an important source of delay and help seeking following onset of myocardial infarction symptoms.

Aged↗

Seroconversion after influenza vaccination in patients with lung cancer.

There are no data in the literature about the efficacy of influenza vaccination in lung cancer patients. Paired sera were available from 59 patients who received Fluvirin (Evans Medical). Of 41 patients susceptible to one or more influenza strains, 78% responded fully to vaccination. This response rate is comparable to that obtained from healthy volunteers.

Aged↗

The impact of catastrophic beliefs on functioning in chronic fatigue syndrome.

This study investigated the association between catastrophic beliefs and disability in the context of Chronic fatigue syndrome (CFS). A sample of 282 CFS sufferers were asked about the consequences of pushing themselves beyond their present physical state. Responses were coded into catastrophic or non-catastrophic categories. While not differing on the length of illness or psychological adjustment, subjects demonstrating catastrophic responses evidenced significantly higher levels of fatigue and were more disabled in terms of their ability to work both in their normal occupation and around the house. Catastrophizers also showed greater disability in terms of their sleep and rest, social communication, and recreational activities. The role of catastrophic beliefs and personal perceptions of CFS in maintaining the illness is discussed.

Activities of Daily Living↗

Clustering of attempted suicide: New Zealand national data.

BACKGROUND: The extent to which clusters of attempted suicides occur is a significant problem that is complementary to the current available research on the clustering of completed suicide. However, little systematic research on clusters of attempted suicides exists. The present study examines the extent and nature of clustering of suicide attempts. METHOD: The occurrence of clustering of attempted suicide was examined in nationwide data for all New Zealand hospitals, obtained from the New Zealand Health Statistics Services for the years 1988-1990. The Scan statistic and Knox procedure were employed for testing the significance of clusters in time and time-space, respectively. RESULTS: The analyses indicated that significant time clustering occurred in younger age groups, specifically among 15-19 and 20-24 year olds. The results could not be accounted for by seasonal variations in admissions. Age specificity of time-space clusters emerged, exhibiting a similar pattern to that reported for completed suicides in the US. CONCLUSIONS: The results suggest a similar underlying mechanism for the clustering of parasuicide and completed suicides and provide support for the existence of contagion of suicidal behaviour. The implications for prevention are discussed.

Adolescent↗

The psychological impact of hip arthroplasty.

The impact of total hip arthroplasty on psychological functioning was examined in 51 patients; 25 females and 26 males with a mean age of 65 years (range 42-81 years). Assessments of psychological well-being and distress were made with the Mental Health Inventory. Life satisfaction, self-rated health, and pain ratings were also obtained. Assessments were made prior to surgery, immediately after surgery, and at a 2 month follow-up. The operation produced significant improvements in psychological well-being (P < 0.001), psychological distress (P < 0.001), life satisfaction (P < 0.01), self-rated health (P < 0.001), and pain (P < 0.001). It is concluded that the changes in medical and functional status following hip arthroplasty documented in previous research are accompanied by substantial improvements in psychological state, and that the inclusion of psychological factors in hip arthroplasty research will provide a more comprehensive assessment of outcome.

Adaptation, Psychological↗

A double-blind trial of melatonin as a treatment for jet lag in international cabin crew.

This study investigated the efficacy of oral melatonin in alleviating jet lag in flight crew after a series of international flights. The optimal time for taking melatonin in this group was also investigated. In a double-blind placebo-controlled trial, 52 international cabin crew were randomly assigned to three groups; early melatonin (5 mg started 3 days prior to arrival until 5 days after return home); late melatonin (placebo for 3 days then 5 mg melatonin for 5 days); and placebo. Daily ratings showed a trend in jet lag, mood, and sleepiness measures toward an improved recovery in the late melatonin group and a worse recovery in the early melatonin group as compared to placebo. Retrospective ratings made 6 days after arrival showed the late melatonin group reported significantly less jet lag and sleep disturbance following the flight compared to placebo. The late melatonin group also showed a significantly faster recovery of energy and alertness than the early melatonin group, which reported a worse overall recovery than placebo. These findings show melatonin may have potential benefits for international aircrew.

Adult↗

Sense of coherence, self-esteem, depression and hopelessness as correlates of reattempting suicide.

Sense of coherence (SOC) has been proposed as a psychological factor that predicts good health and positive adjustment. The three components of SOC: manageability, comprehensibility and meaning were assessed together with depression, hopelessness and self-esteem as factors predicting future suicidal ideation and behaviour in parasuicides. One hundred and fifty hospitalized parasuicides were evaluated on these measures and followed up after six months to determine their current level of suicidal ideation and whether they had been readmitted for a further attempt or killed themselves in the intervening period. Suicidal ideation on admission was best predicted by a low score on the SOC meaning subscale and also significantly related to the other predictor variables. Suicidal ideation at the six-month follow-up was best predicted by the SOC subscales manageability and comprehensibility. These two SOC subscales also emerged as discriminators of suicidal behaviour over the six months following admission. Overall prediction of suicidal behaviour was enhanced by also including the background variables of age, a history of previous attempts, unemployment and whether the attempter was living alone. The study ends with a discussion of the importance of widening the focus when assessing and predicting suicidal risk to include not only predictions based on pathology but also psychological factors that promote adjustment.

Adaptation, Psychological↗

Adherence to medication regimens: updating a complex medical issue.

Clinicians face nonadherence as the norm in everyday medical practice. The literature suggests a number of techniques that are likely to increase adherence when incorporated into regular clinical practices and routines. Central to these guidelines appears to be the doctor-patient relationship. For instance, the physician who uses understandable language, encourages open doctor-patient exchange, fosters participation by patients in their own medical care, and creates a friendly and efficient environment should increase the likelihood of adherence. Clinicians can also check adherence to medication regimens by requesting patients to bring in their pill bottles (or other prescription containers) for a discussion on how the medication appears to be working for them. This should elicit information from the patient about problems related to medication adherence. Since patient variables and social support affect adherence behaviors, eliciting information from patients about their understanding and beliefs regarding their particular illness and treatment, as well as enlisting the support of family and friends, may encourage adherence. Identifying what individual patients perceive as obstacles in following treatment regimens decreases their likelihood of nonadherence; these are difficulties that can be negotiated during the medical interview. Individualizing the treatment and minimizing its complexity may provide the solution that encourages adherent behavior. Frequent reeducation, reinforcement, and encouragement, as well as training in self-management and self-monitoring, will at the very least maximize the patient's comprehension of the illness and his or her motivation for adherence--an especially important requisite for living with a chronic condition. Some patients may even wish to openly solicit family and friends for help in the management and monitoring of their illness and treatment, and to structure their environment to support adherence. Education programs for the patient featuring handouts and pamphlets that provide information about the illness in written and illustrated form have been used successfully. Education programs such as patient-oriented package inserts to accompany the medications and brief written summaries of complex treatment plans may also be useful. The purpose of such patient education adjuncts to illness and treatment lie in the hope that they will enhance the likelihood of following treatment recommendations. Through their use, the reason for the treatment and its potential effectiveness will, it is hoped, be better understood (Ley 1988). Overall, significant advances have been made in adherence research. Measurement systems have become more finely tuned, and the definitions and criteria for adherent behaviors are more clear and precise.(ABSTRACT TRUNCATED AT 400 WORDS)

Attitude to Health↗

Women's attitudes to cervical smear testing.

This study examined women's attitudes and motivations towards cervical screening. The sample consisted of 680 women attending three general practices in two New Zealand towns. Subjects completed a questionnaire relating to their knowledge of the cervical smear test and their current cervical smear status. The questionnaire also assessed what influenced their decision to have an up to date smear test or what reasons subjects gave for not having a current test. Women's preference for the smear taker was also investigated. Most women in the sample (92%) indicated they knew what a cervical screening test was. Current smears were proportionately less common in the at risk groups. The most frequently reported motivation for women to have a current smear was that their doctor had recommended it (30.6%), followed by the response that it was an established part of their personal health routine (20.2%). Most women who didn't have current smear tests gave the reason that they had not got around to having a test (39.4%), with the next reported reason being that the test was embarrassing (17.8%) and their doctor didn't suggest it (14.7%). The majority of women in the sample (59.7%) preferred their own doctor to do the test. The findings of this study highlight the importance of the women's general practitioner in influencing women in high risk groups to have smear tests. They also suggest significant improvements in increasing the number of women screened could be made using existing services.

Adolescent↗

Health-promoting variables as predictors of response to a brief pain management program.

This study investigated the value of the sense of coherence (SOC), self-esteem, and the Mental Health Inventory subscales as predictors of response to a brief pain management program. One hundred and seven chronic pain patients who participated in a pain management program, which included education about pain, relaxation training, and stress management, were sent a follow-up questionnaire 6 months after the course. Reported pain intensity since the course was significantly associated with SOC subscale meaningfulness. The use of relaxation and other techniques taught in the course was correlated with positive affect and well-being. The results suggest that health-promoting variables may offer advantages over pathological measures as predictors of patient response to pain management programs, and SOC is worthy of further study.

Adult↗

Recent general practice contacts of hospitalised suicide attempters.

This study investigated the timing of recent medical contact in 150 patients hospitalised for a suicide attempt. The research also examined the proportion of attempters complaining of feeling depressed or suicidal to their doctor at that recent consultation. Seventy-three percent of attempters had seen their doctor in the past three months. Contact with general practitioners was most common in the week before their attempt with 32% of all attempters visiting their doctor during this time and 56% visiting in the previous month. Of those attempters who had consulted their general practitioner prior to their attempt, only 35% had complained about feeling depressed or suicidal to their doctor. Several factors that hinder the successful identification of suicidal risk in the general practitioner-patient relationship are identified. The implications of these findings for suicide prevention are discussed.

Adolescent↗

Effect of melatonin on jet lag after long haul flights.

OBJECTIVE: To determine whether doses of the pineal hormone melatonin alleviate jet lag. DESIGN: Double blind, placebo controlled crossover trial. SETTING: Long haul return flights from Auckland, New Zealand, to London and back. SUBJECTS: Twenty volunteers with experience of transcontinental flights (eight women and 12 men aged 28 to 68). INTERVENTIONS: Melatonin (or placebo) 5 mg three days before flight, during flight, and once a day for three days after arrival. END POINT: Symptoms of jet lag. MEASUREMENTS AND MAIN RESULTS: Visual analogue scale for feelings of jet lag and tiredness; profile of moods states questionnaire for vigour-activity and fatigue-inertia; and retrospective ratings 10 days after arrival of sleep pattern, energy, and daytime tiredness. Feelings of jet lag were less for subjects taking melatonin (mean score 2.15 v 3.4); these subjects took fewer days than the placebo group to establish a normal sleep pattern (2.85 v 4.15), to not feel tired during the day (3.0 v 4.6), and to reach normal energy levels (3.25 v 4.7). Results for fatigue-inertia and vigour-activity were similar. For all subjects jet lag was more severe on the return (westward) than the outward (eastward) journey. CONCLUSIONS: Melatonin can alleviate jet lag and tiredness after long haul flights.

Adult↗

Psychological well-being and psychiatric disturbance in dialysis and renal transplant patients.

The rate of psychiatric morbidity and levels of psychological well-being and distress were assessed in groups of dialysis, renal transplant and general practice patients. Dialysis patients suffered from significantly higher rates of psychiatric morbidity, with 43 per cent falling into the probable psychiatric case range on the GHQ. Results from the Mental Health Inventory also showed dialysis patients to have a significantly poorer level of psychological adjustment than the other groups. While positive mental health states in dialysis patients were not significantly different from transplant and general practice controls, higher rates of psychological distress were found in patients on dialysis. Distress was characterized by a loss of emotional control and higher levels of depression.

Adaptation, Psychological↗