Novel information was recently provided concerning the reciprocal effects of D-glucose and D-fructose upon their respective metabolism in rat pancreatic islets. In the light of such findings, this study aims at comparing the effects of D-glucose and D-fructose on insulin, somatostatin, and glucagon release from the isolated perfused rat pancreas. A rise in D-glucose concentration from 3.3 to 5.0 or 7.3 mM or the administration of D-fructose (17 and 40 mM) in the presence of 3.3 mM D-glucose stimulated insulin release in a concentration-related manner, but failed to affect somatostatin output. The secretion of glucagon was decreased in all cases. The secretory response to L-arginine (5 mM), 25 min after restoring the basal concentration of D-glucose, was more markedly affected, in terms of potentiation of insulin and somatostatin release and reduction of glucagon output, after prior administration of D-fructose than after a prior increase in D-glucose concentration. These findings argue against any major role for a paracrine regulation of hormonal release and, instead, are consistent with a causal link between metabolic and secretory events in the islet cells. Nevertheless, the present results emphasize differences in the response of distinct pancreatic endocrine cell types to the same or distinct hexoses.
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Front Endocrinol (Lausanne)
December 2024
Recordati Rare Diseases, Central and Eastern Europe, Warsaw, Poland.
Pasireotide is an effective treatment for both Cushing's disease (CD) and acromegaly due to its ability to suppress adrenocorticotropic hormone and growth hormone, and to normalize insulin-like growth factor-1 levels, resulting in tumor shrinkage. However, it may also cause hyperglycemia as a side effect in some patients. The aim of this study was to review previous recommendations regarding the management of pasireotide-induced hyperglycemia in patients with CD and acromegaly and to propose efficient monitoring and treatment algorithms based on recent evidence and current guidelines for type 2 diabetes treatment.
View Article and Find Full Text PDFPituitary
December 2024
Institute of Endocrine and Metabolic Sciences, San Raffaele Vita-Salute University and IRCCS San Raffaele Hospital, Milan, Italy.
Introduction: First-generation somatostatin receptor ligands (fg-SRLs) are the cornerstone of acromegaly treatment. Additional benefits were shown using high dose (HD) or high frequency (HF), relatively short-term regimens. Although several predictors of response to standard dose (SD)-fg-SRLs were reported, outcome biomarkers for HF administration are not yet available.
View Article and Find Full Text PDFSci Adv
December 2024
Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.
Despite their pivotal role, the evolutionary origins of vertebrate digestive systems remain enigmatic. We explored the cellular characteristics of the amphioxus () digestive tract, a model for the presumed primitive chordate digestive system, using bulk tissue companioned with single-cell RNA sequencing. Our findings reveal segmentation and a rich diversity of cell clusters, and we highlight the presence of epithelial-like, ciliated cells in the amphioxus midgut and describe three types of endocrine-like cells that secrete insulin-like, glucagon-like, and somatostatin-like peptides.
View Article and Find Full Text PDFCureus
November 2024
Department of Internal Medicine, Centro Hospitalar Tondela-Viseu, Viseu, PRT.
Insulinomas are rare pancreatic neuroendocrine tumors (NETs) characterized by autonomous insulin secretion leading to hypoglycemia. Malignant insulinomas are defined by the presence of metastases and present significant therapeutic challenges due to limited treatment options. We report the case of a 69-year-old woman with a two-month history of neuroglycopenic symptoms, including morning headaches, blurred vision, palpitations, and sweating, which were alleviated by sugar intake.
View Article and Find Full Text PDFJCEM Case Rep
December 2024
College of Medicine, Alfaisal University, Riyadh 11211, Saudi Arabia.
Hypertrophic osteoarthropathy (HOA: MIM 167100)) is classified into primary and secondary types. Primary HOA, also known as pachydermoperiostosis (PDP), is a rare genetic condition with distinct clinical features including digital clubbing, skin thickening, and periostosis. Secondary HOA often occurs as a paraneoplastic syndrome or is associated with systemic diseases.
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