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Biomedical subjects

J Obenberger

Publications and source records attributed to J Obenberger.

At least 55 records · Page 3Linked to original sources
PubMed1984

Effect of glucocorticoids on the composition of the aqueous humour of the rabbit eye.

Exogenous corticosteroids (dexamethasone, cortisol) inhibit the adrenal secretion of corticosterone in the rabbit and decrease the concentration of corticosterone in aqueous humour, increase glycaemia and cause a rise in glucose concentration in the aqueous. Except for a slight rise 16 h after the corticosteroid administration no effect on plasma or aqueous content of total protein was observed. This is in striking contrast with the increase of proteins in aqueous humour after ACTH injection. Thus it seems likely that corticosteroids do not mediate the effect of ACTH on the disruption of the blood-aqueous barrier.

Animals↗
PubMed1984

Content and binding of aldosterone in human ocular lens.

The concentration of aldosterone was determined by radioimmunoassay in homogenates from a total of 227 human cataractous lenses divided into six groups according to age and accompanying diseases (i.e. glaucoma, essential hypertension, diabetes and combination of the two latter diseases). Aldosterone concentration in cataracts ranged from 0.020 to 0.036 fmol mg-1 protein. Significantly higher values were found in lenses of patients with hypertension (0.047 +/- 0.022 fmol mg-1 protein). Using two independent methods an evidence was brought that specific and saturable aldosterone binding occurs in cytosol of human lens epithelium obtained from autopsy specimens, which is not identical with glucocorticoid binding. Electrophoretic properties of this aldosterone binding entity correspond to a protein with a relative molecular mass of 90 000 daltons.

Adult↗
PubMed1983

Effect of ACTH on the composition of the aqueous humour of the rabbit eye.

Tetracosactide (Synacthen, Ciba) increases the concentration of corticosterone in the aqueous humour of the rabbit eye. The maximal increase, about 5-fold of the basal level, occurs with a slight delay of approximately 30 min after the maximally stimulated corticosterone level in blood plasma. Glucocorticoid elevation is paralleled by an increase of protein content and a slight rise of glucose in aqueous. A disruption of the blood-aqueous barrier by ACTH similar to the action of alpha-melanocyte-stimulating hormone is suggested.

Adrenocorticotropic Hormone↗
PubMed1981

Aqueous humour and plasma cortisol levels in glaucoma and cataract patients.

By means of radioimmunoassay, the content of endogenous cortisol in the aqueous humour and plasma of 35 patients suffering from various types of glaucomas and 35 cataract patients was determined, and the ratio of the plasma to the aqueous humour cortisol levels was calculated. The highest cortisol level in both plasma and aqueous humour was found to occur in patients with open-angle glaucoma suffering at the same time from systemic hypertension. The lowest plasma to aqueous humour cortisol ratio was found in patients with secondary glaucoma treated with steroids. In woman suffering from open-angle glaucoma, the rising cortisol level in plasma with age contrasted to the decreasing cortisol level in aqueous humour. The authors suggest that there is an active interference with homeostatic mechanisms responsible for ensuring the stability of the eye inner milieu and a certain protection of the trabecular meshwork of the angle of the anterior eye chamber against noxious effects of the endogenous cortisol.

Adult↗
PubMed1979

Cataractogenic and lethal effect of selenite in rats during postnatal ontogenesis.

Male rats aged 5, 10, 15, 20, 30, 40, 50 and 60 days were injected with a single dose of sodium selenite (20 or 40 mumol/kg b.w.). For two months after the injection, all the rats were observed daily for mortality (acute up to 24 h after the injection, subacute 2--7 days after) and the incidence of permanent and intermittent cataract. With the higher dose, both forms of lethal effect were found to shift to earlier phases of ontogenetic development, subacute mortality appearing sooner than acute mortality. The cataractogenic effect produced by the administration of both 20 and 40 mumol/kg b.w. dependent on the age of the experimental animals. It appeared only in the early phases of ontogenetic development (up to the age of 15 days); cataract was not observed during later development.

Age Factors↗