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The recent success of pancreatic islet transplantation has generated considerable enthusiasm. To better understand the quality and characteristics of human islets used for transplantation, we performed detailed analysis of islet architecture and composition using confocal laser scanning microscopy. Human islets from six separate isolations provided by three(More)
To investigate molecular mechanisms controlling islet vascularization and revascularization after transplantation, we examined pancreatic expression of three families of angiogenic factors and their receptors in differentiating endocrine cells and adult islets. Using intravital lectin labeling, we demonstrated that development of islet microvasculature and(More)
Adrenal response to iv administration of 1-24 ACTH (250 micrograms) was examined in normal volunteers under various conditions. The effect of basal cortisol levels was examined by performing the tests at 0800 h with and without pretreatment with dexamethasone. The effect of time of day was evaluated by performing the tests at 0800 h and at 1600 h,(More)
OBJECTIVE The authors sought to carefully test, by using a technique of continuous CSF sampling, the hypothesis that basal elevations in CSF corticotropin-releasing hormone (CRH) concentrations exist in patients with posttraumatic stress disorder (PTSD). They also sought to assess the relationship among PTSD symptoms, adrenocortical activity, and CSF CRH(More)
Isolated adrenocorticotropin (ACTH) deficiency is a rare cause of secondary adrenocortical insufficiency. This review summarizes the clinical and laboratory features of 39 previously reported cases plus 4 new patients. The clinical manifestations of isolated ACTH deficiency are variable, nonspecific and similar to those seen in adrenocortical insufficiency(More)
Complete lack of transcription factor PDX-1 leads to pancreatic agenesis, whereas heterozygosity for PDX-1 mutations has been recently noted in some individuals with maturity-onset diabetes of the young (MODY) and in some individuals with type 2 diabetes. To determine how alterations in PDX-1 affect islet function, we examined insulin secretion and islet(More)
The immunoreactive (RIA), ACTH, LPH, alpha endorphin (alpha End) and beta End in an extract of a human pancreatic islet cell carcinoma causing the ectopic ACTH syndrome were assayed after gel exclusion chromatography. In addition to "big", "intermediate" and "little" ACTHs, beta lipotropin (beta LPH) and gamma LPH, the eluate fractions contained RIA-alpha(More)