insulinoma/نقص الأكسجة

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Exendin-4 increases the expression of hypoxia-inducible factor-1α in rat islets and preserves the endocrine cell volume of both free and macroencapsulated islet grafts.

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In this study, we evaluated the effects of exendin-4 on free and encapsulated islet grafts in a rodent model. We also investigated the role of a transcription factor, hypoxia-inducible factor-1 (HIF-1), in mediating the beneficial effects of exendin-4. Diabetic athymic mice were transplanted with

Correlating hypoxia with insulin secretion using a fluorescent hypoxia detection system.

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A common obstacle to the survival of encapsulated tissue is oxygen insufficiency. This appears particularly true of encapsulated pancreatic β-cells. Our work investigates a fluorescent hypoxia detection system for early recognition of hypoxic stress in encapsulated pancreatic tissue. Murine

Peripheral nerve endoneurial microangiopathy and necrosis in rats with insulinoma.

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Peripheral nerve pathology related to chronic hyperinsulinemia and hypoglycemia has yet to be fully explored. Here we conducted a systematic quantitative analysis of morphological alterations in peripheral sensory and motor nerve fibers and endoneurial microvasculature in longstanding

Refractory Metastatic Insulinoma Treated with Everolimus, Complicated by Cryptogenic Organizing Pneumonia.

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Insulinoma is a rare neuroendocrine pancreatic islet cell tumor of which the majority are benign and solitary. Its estimated incidence is 2 to 4 cases per 1 million person-years. We report the case of an 82-year-old female who presented with metastatic insulinoma to the liver and retroperitoneal

A comparison of non-viral vectors for gene delivery to pancreatic beta-cells: delivering a hypoxia-inducible vascular endothelial growth factor gene to rat islets.

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Although non-viral vectors are relatively safe, they have very low gene transfection efficiency, especially in pancreatic islet cells. To provide information on the use of non-viral vectors for transfecting genes into pancreatic islet cells, a comparative evaluation of non-viral options was

System for exposing cultured cells to intermittent hypoxia utilizing gas permeable cultureware.

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Tissue intermittent hypoxia (IH) occurs in obstructive sleep apnea, sickle cell anemia, physical exercise and other conditions. Poor gas solubility and slow diffusion through culture media hampers mimicking IH-induced transitions of O(2) in vitro. We aimed to develop a system enabling exposure of

Hypoxia inducible factor-1 mediates pancreatic β-cell dysfunction by intermittent hypoxia

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The role of hypoxia-inducible factor (HIF)-1 in pancreatic β-cell response to intermittent hypoxia (IH) was examined. Studies were performed on adult wild type (WT), HIF-1α heterozygous (HET) as well as β-cell specific HIF-1^-/- mice and mouse insulinoma (MIN6) cells exposed to IH

Peptide micelle-mediated curcumin delivery for protection of islet β-cells under hypoxia.

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Islet transplantation is one of many therapeutic approaches for the treatment of diabetes. During transplant procedures, the isolated islets are subjected to hypoxic conditions, and undergo the apoptotic process. Curcumin has a cytoprotective effect, and may therefore be useful for the protection of

Effects of short-term hypoxia on a transformed cell-based bioartificial pancreatic construct.

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Hypoxia is an adverse condition that can jeopardize the function of a bioartificial pancreatic construct. In this study we have investigated the effects of short-term hypoxic exposure (up to 24 h) on the bioenergetic status, metabolism, and insulin secretion of perfused pancreatic constructs

Enhanced expression of glutathione peroxidase protects islet beta cells from hypoxia-reoxygenation.

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The survival of pancreatic islet beta-cell xenografts and allografts may be affected by damaging reactive oxygen and nitrogen species generated during hypoxia-reoxygenation. Peroxynitrite, which is formed from superoxide and nitric oxide, appears to be an important mediator of beta-cell destruction.

Reversible brain cell damage due to hypoglycemia in a patient with insulinoma.

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A case of an insulinoma with hypoglycemic attacks accompanied by episodes of unconsciousness in a 57-year-old woman is described. During the hypoglycemic spells the level of adenylate kinase (AK) in the cerebrospinal fluid (CSF) was elevated 6-fold above the normalized level obtained later from the

Role of aryl hydrocarbon receptor nuclear translocator in KATP channel-mediated insulin secretion in INS-1 insulinoma cells.

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Aryl hydrocarbon receptor nuclear translocator (ARNT) has been known to participate in cellular responses to xenobiotic and hypoxic stresses, as a common partner of aryl hydrocarbon receptor and hypoxia inducible factor-1/2alpha. Recently, it was reported that ARNT is essential for adequate insulin

Hypoxia potentiates LPS-induced inflammatory response and increases cell death by promoting NLRP3 inflammasome activation in pancreatic β cells.

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Hypoxia and islet inflammation are involved in β-cell failure in type 2 diabetes (T2D). Elevated plasma LPS levels have been verified in patients with T2D, and hypoxia occurs in islets of diabetic mice. Activation of inflammasomes in ischemic or hypoxic conditions was identified in various tissues.

Acute hypoxia induces apoptosis of pancreatic β-cell by activation of the unfolded protein response and upregulation of CHOP.

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The success of pancreatic β-cells transplantation to treat type 1 diabetes has been hindered by massive β-cell dysfunction and loss of β-cells that follows the procedure. Hypoxia-mediated cell death has been considered one of the main difficulties that must be overcome for transplantation to be

Immune landscape, evolution, hypoxia-mediated viral mimicry pathways and therapeutic potential in molecular subtypes of pancreatic neuroendocrine tumours

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Objective: A comprehensive analysis of the immune landscape of pancreatic neuroendocrine tumours (PanNETs) was performed according to clinicopathological parameters and previously defined molecular subtypes to identify potential

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