Biomedical subjects

J C Hyde

Publications and source records attributed to J C Hyde.

9 recordsLinked to original sources

PubMed1984

Neonatal hyperparathyroidism.

We describe a girl with congenital hyperparathyroidism who presented soon after birth with respiratory distress, hypotonia, feeding difficulties, and bone deformities. Hypercalcaemia, hypophosphataemia, and raised alkaline phosphatase were present and plasma parathyroid hormone levels measured by radioassay and bioassay were raised. X-rays showed gross demineralisation with metaphyseal fractures, erosions, and sub-periostal reaction along the bones. Following surgical removal of four hyperplastic parathyroid glands and subsequent maintainance therapy with 1-alpha-hydroxycholecalciferol there has been virtually complete reversal of her bone abnormalities.

Female↗

PubMed1976

Electron cytochemical localization of gamma-aminobutyric acid catabolism in rat cerebellar cortex.

An electron cytochemical technique is described for the localization of GABA-T, the enzyme which degrades the neurotransmitter GABA, in rat cerebellar cortex. The technique allows ultrastructural demonstration of GABA-T activity by the final deposition of an electron dense formazan precipitate at reaction sites, whilst maintaining adequate ultrastructural preservation for recognition of cellular and subcellular structures. Numerous electron dense precipitates are evident as discrete punctate deposits situated mainly in mitochondria of stellate cells, basket cells and astrocytic glial cells; they are also seen in axonal or dendritic profiles at some synaptic junctions. The technique enables the first cytochemical demonstration of the mitochondrial localization of GABA-T activity in nervous tissue to be presented. It establishes that GABA-T is present in supposed GABA neurones, in pre- or post-synaptic endings, or both, of presumed inhibitory synapses and in glial cells which may be associated with these synapses. From this seemingly ubiquitous distribution, functional aspects of GABA-T in these cells is considered.

4-Aminobutyrate Transaminase↗

PubMed1976

Improved histological localization of GABA-transaminase activity in rat cerebellar cortex after aldehyde fixation.

A method for the chemical fixation of the enzyme GABA-transaminase in nervous tissue is described. It is shown that after perfusion with a formaldehyde/glutaraldehyde fixative, activity of the enzyme in cerebellar cortex is demonstrable whilst cellular morphology is preserved. Results from the improved technique have shown new sites of GABA-transaminase activity in cerebellar cortex. In view of these results a special function for glial cells in this area of brain has been suggested.

4-Aminobutyrate Transaminase↗

PubMed1975