Biomedical subjects

Louise Jones

Publications and source records attributed to Louise Jones.

26 records · Page 2Linked to original sources

PubMed2003

The impact of cancer on sexual function: a controlled study.

BACKGROUND: Little is known about sexual problems in patients with cancer. AIMS: To estimate 1) the prevalence and characteristics of sexual dysfunction in patients undergoing treatment for cancer, 2) how sexual dysfunction varies with stage of illness. METHOD: Cross-sectional study of outpatients with cancer attending palliative care and oncology services and matched patients without cancer attending general practice. Patients completed a questionnaire on sexual function designed in a feasibility study, the Derogatis subscale on sexual satisfaction, the GHQ12 and the EuroQol. RESULTS: Patients with all types of cancer are willing to talk about their sex lives and the impact of the disease on their sexual function. This impact was significant when compared to the comparison group of general practice attendees of the same age. Palliative care patients were affected more than other cancer patients. CONCLUSION: This work may lead to greater awareness among healthcare professionals that patients with all types of cancer may experience sexual difficulties. Addressing potential sexual problems during the course of disease may give patients confidence to discuss such issues as they occur, thus avoiding embarrassment or aggravation of the problems later in their illness.

Cross-Sectional Studies↗

PubMed2002

Spiritual beliefs may affect outcome of bereavement: prospective study.

OBJECTIVE: To explore the relation between spiritual beliefs and resolution of bereavement. DESIGN: Prospective cohort study of people about to be bereaved with follow up continuing for 14 months after the death. SETTING: A Marie Curie centre for specialist palliative care in London. PARTICIPANTS: 135 relatives and close friends of patients admitted to the centre with terminal illness. MAIN OUTCOME MEASURE: Core bereavement items, a standardised measure of grief, measured 1, 9, and 14 months after the patients' death. RESULTS: People reporting no spiritual belief had not resolved their grief by 14 months after the death. Participants with strong spiritual beliefs resolved their grief progressively over the same period. People with low levels of belief showed little change in the first nine months but thereafter resolved their grief. These differences approached significance in a repeated measures analysis of variance (F=2.42, P=0.058). Strength of spiritual belief remained an important predictor after the explanatory power of relevant confounding variables was controlled for. At 14 months the difference between the group with no beliefs and the combined low and high belief groups was 7.30 (95% confidence interval 0.86 to 13.73) points on the core bereavement items scale. Adjusting for confounders in the final model reduced this difference to 4.64 (1.04 to 10.32) points. CONCLUSION: People who profess stronger spiritual beliefs seem to resolve their grief more rapidly and completely after the death of a close person than do people with no spiritual beliefs.

Adaptation, Psychological↗

PubMed2002

Dynamics of T cell responses in HIV infection.

Cytotoxic CD8(+) T cells play a major role in the immune response against viruses. However, the dynamics of CD8(+) T cell responses during the course of a human infection are not well understood. Using tetrameric complexes in combination with a range of intracellular and extracellular markers, we present a detailed analysis of the changes in activation and differentiation undergone by Ag-specific CD8(+) T cells, in relation to Ag-specific CD4(+) T cell responses, in the context of a human infection: HIV-1. During primary HIV-1 infection, the initial population of HIV-specific CD8(+) T cells is highly activated and prone to apoptosis. The Ag-specific cells differentiate rapidly from naive to cells at a perforin low intermediate stage of differentiation, later forming a stable pool of resting cells as viral load decreases during chronic infection. These observations have significant implications for our understanding of T cell responses in human viral infections in general and indicate that the definition of effector and memory subsets in humans may need revision.

Acute Disease↗

PubMed2002

[Immunohistochemical study of P-cadherin in breast cancer].

INTRODUCTION: Cell adhesion molecules play a significant role in the cellular connection of normal cells. The cadherins are believed to act as tumour suppressors, and their altered expression and function have been associated with tumour development. AIM AND METHODS: The authors examined the expression of a Ca++ dependent intercellular adhesion molecule, P-cadherin using an immunohistochemical method in 69 surgically resected breast carcinomas. RESULTS: P-cadherin was detected in 30 cases (43.5%, cytoplasmic and/or membrane staining). The expression of P-cadherin was independent of tumour size and lymph node status, but correlated with a high tumour grade (grade III). In contrast, expression of E-cadherin correlated with lower tumour grade (grade I-II). P-cadherin expression was not detected in invasive lobular carcinomas. CONCLUSION: In general, P-cadherin was expressed at a lower frequency compared to E-cadherin, alpha-, and beta-catenin. These results suggest that an inverse relationship may exist between E- and P-cadherin in relation to grade, and that the expression of P-cadherin may be a marker of aggressiveness.

Breast Neoplasms↗

PubMed2002

Revealing micro-RNAs in plants.

Recent work has resulted in the identification of >100 endogenous non-coding small RNA molecules in plants. These micro-RNAs (miRNAs) have the capacity to regulate a range of predicted target mRNAs, many of which are transcription factors involved in the control of meristem identity. Mutants defective in either CARPEL FACTORY or Hen1 fail to accumulate miRNAs and have severe developmental defects. Thus, miRNAs are implicated as potentially key regulatory molecules in plant development.

Arabidopsis Proteins↗

PubMed2002

Spreading of RNA targeting and DNA methylation in RNA silencing requires transcription of the target gene and a putative RNA-dependent RNA polymerase.

RNA silencing is a sequence-specific RNA degradation process that follows the recognition of double-stranded RNA. Here, we show that virus vectors carrying parts of a green fluorescent protein (GFP) transgene targeted RNA silencing in Nicotiana benthamiana and Arabidopsis against the entire GFP RNA. These results indicate that there was spreading of RNA targeting from the initiator region into the adjacent 5' and 3' regions of the target gene. Spreading was accompanied by methylation of the corresponding GFP DNA. It also was dependent on transcription of the transgene and on the putative RNA-dependent RNA polymerase, SDE1/SGS2. These findings indicate that SDE1/SGS2 produces double-stranded RNA using the target RNA as a template. RNA silencing of ribulose-1,5-bisphosphate carboxylase/oxygenase and phytoene desaturase was not associated with the spreading of RNA targeting or DNA methylation, indicating that these endogenous RNAs are not templates for SDE1/SGS2.

Arabidopsis↗

PubMed2002

Prospective, randomized, double-blind trial investigating the effect of doxycycline on matrix metalloproteinase expression within atherosclerotic carotid plaques.

BACKGROUND AND PURPOSE: Elevated levels of matrix metalloproteinases (MMPs), particularly MMP-1 and MMP-9, have been implicated in plaque rupture. It has been suggested that inhibition of MMPs may stabilize vulnerable atherosclerotic plaques and improve clinical outcome. The aim of the study was to investigate the ability of doxycycline, a nonspecific MMP inhibitor, to reduce MMP concentration in carotid atheroma. METHODS: The study design was a prospective, double-blind randomized trial. One hundred patients requiring carotid endarterectomy were randomized to receive 200 mg/d doxycycline or placebo for 2 to 8 weeks before surgery. During endarterectomy, carotid plaques were retrieved. The concentrations of MMPs and doxycycline were determined in the atherosclerotic tissue by enzyme-linked immunosorbent assay and high-performance liquid chromatography, respectively. Clinical events were recorded, as was the rate of preoperative embolization (transcranial Doppler). RESULTS: Analysis of endarterectomized specimens demonstrated a mean doxycycline concentration of 6.0 micro g/g wet weight in treated patients. Administration of doxycycline significantly reduced the concentration of MMP-1 in carotid plaques from a mean of 14.8 to 10.3 ng/100g wet weight (P=0.038). This difference was due to decreased MMP-1 transcript (P<0.001). There was no difference in any other MMP (MMP-2, -3, or -9) or tissue inhibitor of matrix metalloproteinases-1 or -2. CONCLUSIONS: Doxycycline penetrated atherosclerotic plaques with acceptable tissue levels. This resulted in a reduction in MMP-1 concentration because of decreased expression.

Aged↗

PubMed2002

Allergen-specific CD8(+) T cells and atopic disease.

Considerable evidence suggests that IL-10 may have a role in the manifestation of atopic disease. We sought to test the hypothesis that at the single cell level, allergen-specific T cells have diminished IL-10 production capacity in severely affected atopics compared with asymptomatic atopics. We defined three A*0201-restricted Der p 1 CD8(+) T cell epitopes. Using human leukocyte antigen-A*0201-peptide (HLA-A*0201-peptide) tetrameric complexes and enzyme-linked immunospot assays to analyze peripheral blood mononuclear cells from A*0201-positive severely symptomatic atopics, asymptomatic atopics, and nonatopic controls, we observed a significant association between the frequency of the Der p 1-specific CD8(+) T cells and disease activity. The specific T cells expressed an antigen-experienced cell surface phenotype, and 45.7% were positive for cutaneous lymphocyte-associated antigen. The specific T cells were able to produce IFN-gamma efficiently, but their IL-10 production was significantly reduced in severely affected atopics. In contrast, viral-specific CD8(+) T cells were able to produce equivalent amounts of IL-10 in the severely affected atopics compared with asymptomatic atopics and nonatopics. Through defining the first human atopic allergen HLA class I epitopes, we have provided a possible cellular mechanism to link the previous association of low IL-10 levels and severe atopic disease. These data are consistent with a role for CD8(+) T cells in atopic disease pathogenesis and may provide a basis for future T cell immunotherapy strategies.

Adult↗