Search PubMed⌕ Search

Biomedical subjects

J Denton

Publications and source records attributed to J Denton.

64 records · Page 4Linked to original sources
PubMedDate not supplied

Bone aluminium content in Alzheimer's disease.

The possible association between aluminium and Alzheimer's disease is still contentious. If aluminium neurotoxicity is implicated in the pathophysiology of Alzheimer's disease, it may result either from excessive aluminium exposure or increased brain aluminium uptake. In a pilot study to test the former hypothesis, trabecular bone aluminium content, which reflects long-term aluminium exposure, was evaluated in 7 patients with a clinical diagnosis of senile dementia of the Alzheimer type (SDAT; mean age 80.8 +/- 3.35 years) and 19 non-demented age-matched controls (mean age 79.6 +/- 6.09 years). Trabecular bone was obtained from post-traumatic femoral neck fracture specimens taken from patients during femoral head prosthesis surgery. Bone aluminium content was expressed quantitatively by atomic absorption spectrometry and qualitatively by the acid solochrome azurine histological staining technique. Quantitative analysis showed a lower aluminium content in the SDAT (11.9 +/- 4.04 micrograms/g dry bone) versus the non-demented group (18.2 +/- 7.37 micrograms/g), which was significant at the 95% but not at the 99% confidence limit. Aluminium deposition from qualitative histological analysis was not detectable in either group. These results do not support a hypothesis of excessive aluminium absorption and tissue accumulation in Alzheimer's disease.

Age Distribution↗
PubMedDate not supplied

Evidence for the induction of a tumour associated cell surface protease on cytologically normal epithelial cells present in the sputum of patients possessing lung tumours.

Sputum obtained from healthy subjects and patients with known lung tumours has been challenged with fluorescent probes for the presence of an active cell surface protease. The mature epithelial cells from healthy patients' sputum lacked ability to bind these fluorescent probes whilst the majority of mature epithelial cells in the tumour patients' sputum bound these probes and consequently fluoresced. This demonstrable difference in the cell surface chemistry of mature epithelial cells was linked to the presence of lung tumour cells, which also possessed this cell surface protease. The mechanism of this induced cell surface enzyme appearance is not understood.

Biomarkers, Tumor↗
PubMedDate not supplied

Fluorescent location of malignant cells in fine needle aspirates.

Malignant cells in fine needle aspirates possess a cell surface protease which can be targeted with fluorescent affinity probes. Cells with active GB exhibit cell surface fluorescence when stained with such affinity probes. The nuclei of all cells on the slides can be counterstained with a nuclear fluorescent stain. Malignant cells are then located by their cell surface fluorescence and their diagnosis confirmed by examining their fluorescent nuclei. Normal cells and benign cells exhibit no cell surface fluorescence and can be ignored. This technique can be used to rapidly select cells of cytological interest in FNA samples obtained routinely and might be adapted for automated screening of FNA.

Automation↗
PubMedDate not supplied

Type II collagen induced arthritis: comparison of histological changes in arthritis-susceptible and arthritis-resistant rats.

Wistar rats (type II collagen-induced arthritis-susceptible) and PVG.RT1u rats (arthritis-resistant) were immunised with type II collagen and histological changes in the synovial tissues of the hind feet and in the popliteal lymph nodes draining these feet were examined and compared with unimmunised rats. There were no apparent differences in the joints of unimmunised rats of each strain, but the popliteal lymph nodes of the Wistar rats appeared more "activated", suggesting possible differences between strains in the continuous, low-grade release of antigens from the joints. Whilst the joints of arthritic rats showed the most marked histological changes, the joints of immunised PVG.RT1u rats and of non-arthritic Wistar rats showed some minor changes in the synovia and loss of cartilage with a concomitant increase in the size of the popliteal lymph nodes. The number of mast cells per unit area increased in the lymph nodes of immunised PVG.RT1u rats in proportion to the size increase, but decreased in those draining arthritic Wistar rat feet. The number of mast cells per unit area of synovium decreased most in arthritic feet and the staining pattern of the mast cells altered in the most severely arthritic feet, suggesting a change in mast cell population. These differences in mast cells may be directly related to whether or not clinical arthritis develops in a particular joint. Further study of mast cell sub-populations is warranted.

Animals↗
PubMedDate not supplied

On the stability of a tumour cell surface protease after exposure to 6N HCl.

Well defined acinar tumour cells in frozen sections were exposed to 6NHCl for 5 h at room temperature. A technique was designed to monitor the activity of the enzyme, guanidinobenzoatase (GB), on these tumour cells; this involved cross-linking the enzyme to the cell surface and challenging the active centre with known fluorescent probes which only bind to the functional enzyme. It was demonstrated that the enzymic activity can be regained by appropriate folding of the protein.

Carboxylic Ester Hydrolases↗
PubMedDate not supplied

The nurse's role in treating fertility problems.

This article is the fifth part of our series on aspects of fertility. The role of nursing in this specialty is described alongside the training and education needed to develop this role.

Female↗