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Tyrphostin-23 enhances steroid-hormone secretion from dispersed human and rat adrenocrotical cells.
Endocr Res
August 2000
Department of Human Anatomy and Physiology, University of Padua, Italy.
Tyrphostin-23 is commonly used as inhibitor of tyrosine kinase (TK). We found that tyrphostin-23 concentration-dependently increased basal steroid-hormone secretion from dispersed human and rat adrenocortical cells, the maximal effective concentration being 10(-5) M. Tyrphostin-23 (10(-5) M) enhanced 10(-9) M angiotensin-II- and endothelin-1-stimulated secretion of human and rat adrenocortical cells, but not the secretory response to 10(-9) M ACTH However, it increased the response to lower concentrations (10(-12) or 10(-11) M) of ACTH.
View Article and Find Full Text PDFPurification of cationic cystine-rich peptides from rat bone marrow. Primary structures and biological activity of the rat corticostatin family of peptides.
Regul Pept
July 1992
Endocrine Laboratory, Royal Victoria Hospital, Montreal, Quebec, Canada.
Seven cationic, cystine-rich peptides of 29 to 32 amino acid residues have been purified from extracts of rat bone marrow (R-1, R-1a, R-1b, R-2, R-3, R-4 and R-5). Structural analysis clearly indicated that all seven peptides belong to the corticostatin/defensin family of leukocyte-derived peptides known to participate in oxygen-independent killing of phagocytosed bacteria. For R-1 to R-5, six cysteine residues were found at characteristic and highly conserved positions.
View Article and Find Full Text PDFThalamic and intact pigeons were equipped with a chronic arterial catheter and with a miniature electronic device for hypothalamic telestimulation. Chronic catheterization allowed for repetitive blood sampling in freely moving birds subjected to either systemic (ether inhalation) or neurogenic (electrical foot shocks) stress and to electrical stimulation of the hypothalamic corticotropic area. Corticosterone levels were determined by protein binding assay at 2-, then 5- and 10-min intervals, for 100 min.
View Article and Find Full Text PDFFour cases of adrenoleukodystrophy (ALD) and one case of adrenomyeloneuropathy (AMN) have developed in a kindred over three generations demonstrating that AMN is a clinical variant of ALD. Pituitary-adrenal function studies were performed in 10 family members, including two affected males and four females identified as carriers of ALD/AMN. No pituitary-adrenal abnormality was found in the carriers.
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