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Biomedical subjects

J M Foy

Publications and source records attributed to J M Foy.

35 records · Page 2Linked to original sources
PubMed1973

Effect of single dose administration of diuretics on the blood sugar of alloxan-diabetic mice or mice made hyperglycaemic by the acute administration of diazoxide.

1. Frusemide produced hyperglycaemia in mice when administered together with diazoxide. The interaction between the drugs in elevating the blood sugar was shown to be additive.2. The diuretic, natriuretic and kaliuretic effects of frusemide were very markedly attenuated by diazoxide.3. Neither ethacrynic acid nor hydrochlorothiazide exerted any effect upon blood sugar when administered together with diazoxide.4. Bilateral nephrectomy completely prevented the hyperglycaemic effect of frusemide in normal mice and in mice treated with diazoxide. Diazoxide itself still produced hyperglycaemia in nephrectomized mice.5. Frusemide, ethacrynic acid and diazoxide, but not hydrochlorothiazide, each produced hyperglycaemia in alloxan-diabetic mice, this being prevented by bilateral nephrectomy.

Animals↗
PubMed1971

Effect of diuretics on mouse blood sugar following single dose administration.

1. Frusemide, in doses which were maximal or supramaximal in respect of its natriuretic, diuretic and kaliuretic properties, produced a dose dependent, transient hyperglycaemic response in the mouse.2. Bilateral nephrectomy resulted in a complete abolition of the hyperglycaemic response.3. The hyperglycaemic response was accompanied by a decrease in liver glycogen and was significantly attenuated by adrenalectomy, adrenal demedullation and pretreatment with dihydroergotamine (DHE).4. In the nephrectomized mouse frusemide treatment produced a marked reduction in intravenous glucose tolerance and a reduction in the plasma concentration of immunoreactive insulin following glucose administration. The drug had no detectable effect upon insulin sensitivity.5. Hydrochlorothiazide exerted no detectable effect on mouse blood sugar.6. Ethacrynic acid hyperglycaemia was obtainable after intraperitoneal or intramuscular injection, but not after intravenous injection. Intravenously administered ethacrynic acid exerted no effect upon intravenous glucose tolerance or insulin sensitivity in the nephrectomized mouse.

Adrenalectomy↗
PubMedDate not supplied

Cell wall antigens of Pneumocystis carinii trophozoites and cysts: purification and carbohydrate analysis of these glycoproteins.

We have purified and biochemically analyzed individual cell wall glycoproteins of Pneumocystis carinii. Our results show that corresponding core glycoproteins constitute the cell wall antigens in both trophozoites and cysts, and glycosylation of these glycoproteins does not appear to be significantly altered during development. Cysts and trophozoites in rat-derived organism preparations were separated from each other by counterflow centrifugal elutriation, then treated with Zymolyase to obtain the cell wall fractions. Gel electrophoresis patterns of these fractions from both life-cycle stages were qualitatively similar. Ten major antigenic glycoproteins in these fractions were purified by preparative continuous elution gel electrophoresis. All ten glycoproteins from cysts and trophozoites contained mannose, glucose, galactose, and N-acetylglucosamine, and some contained traces of fucose. The glycoproteins of cysts had more mannose than their trophozoite counterparts. The trophozoite glycoproteins differed from those of the cyst by the presence of xylose. To examine the species-specificity of glycoprotein glycosylation, preparations of human-derived P. carinii (comprised of mixed life-cycle stages) were also examined and found to contain the same sugars as those found in rat-derived organisms. Most of the purified rat-derived glycoproteins bound Concanvalin A, which was abolished by treatment with N-glycanase. This suggested that the majority of the oligosaccharides were N-linked to the proteins, but attempts to identify carbohydrate linkage sites by amino acid sequencing were hampered by apparent modifications of residues. The peptides derived by cyanogen bromide cleavage revealed distinct size patterns for each glycoprotein, suggesting that they were distinct proteins. Most of the glycoproteins reacted with monoclonal antibodies which recognize a highly conserved epitope on rat P. carinii. Four of the individually purified glycoprotein preparations elicited in vitro cellular immune responses, implicating their involvement in the recognition of P. carinii by host T cells. The identification and characterization of P. carinii cell wall proteins will be helpful in analyzing the relationship of the organism to its mammalian host.

Amino Acid Sequence↗
PubMedDate not supplied

Assessment and treatment of dementia in medical patients.

The incidence of dementia rises rapidly with age. Elderly people commonly have significant medical conditions that impact on cognition and functional ability. The diagnosis of dementia requires both a decline in cognition and loss of functional ability. Assessment of dementia in medical patients requires a holistic approach that encompasses the spectrum of disease from measuring impairment of specific mental abilities to evaluating handicap in the patient's normal social setting. Similarly, treatment can be aimed at any point in this spectrum. Recent licensing of new cholinesterase inhibitors for the treatment of Alzheimer's disease has introduced specific problems in the treatment of medical patients with dementia. This review provides a framework for clinicians to assess and treat dementia in medical patients and describe s a practical approach to the prescribing of cholinesterase inhibitors in patients with concomitant medical problems.

Aged↗