Sökning: "glucagon secretion"

Visar resultat 6 - 10 av 78 avhandlingar innehållade orden glucagon secretion.

  1. 6. Paracrine control of glucagon secretion in the pancreatic α-cell: Studies involving optogenetic cell activation

    Författare :Caroline Miranda; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Type 2 Diabetes; Glucagon; α-Cell; Optogenetics;

    Sammanfattning : ABSTRACT The mechanisms controlling glucagon secretion by α-cells in islets of Langerhans were studied. We generated mice with the light-activated ion channel ChR2 specifically expressed in β-, α-, and δ-cells, and explored the spatio-temporal relationship between cell activation and glucagon release. LÄS MER

  3. 7. Islet hormonal hypersecretion and metformin’s effect on islet hormonal secretion studied in vitro and in vivo

    Författare :Quan Wen; Anders Forslund; Hannes Manell; Hjalti Kristinsson; Lisa Juntti-Berggren; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; alpha cell; carboxypeptidase E; childhood obesity; DRP-1; free fatty acids; glucagon secretion; glucose metabolism; glucose stimulated insulin secretion; human islets; hyperinsulinemia; metformin; mitochondrial fission; oral glucose tolerance test OGTT ; prohormone convertase; proinsulin; proinsulin to insulin ratio PI:I ;

    Sammanfattning : Childhood obesity has surged globally. Elevated levels of free fatty acids contribute to hyperinsulinemia, hyperproinsulinemia, and hyperglucagonemia connected with both obesity and type 2 diabetes mellitus (T2DM). Metformin has beneficial effects on islets by influencing metabolism and reducing stress-induced cell death. LÄS MER

  4. 8. Physiology and Pathophysiology of Hormone Secretion from lslets of Langerhans

    Författare :Samuel Acreman; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Islet; diabetes; glucagon; insulin; somatostatin; incretin; pancreas; hypoglycaemia; tetraspanin; GLP-1; endoplasmic reticulum;

    Sammanfattning : Diabetes is a metabolic disorder stemming from the improper regulation of blood glucose levels by hormones secreted by pancreatic islets of Langerhans. Paper I describes the mechanism by which glucose can regulate glucagon secretion, independent of membrane potential, from pancreatic α-cells, via modulation of endoplasmic reticulum Ca2+ handling. LÄS MER

  5. 9. ATP Dynamics in Pancreatic α- and β-cells

    Författare :Jia Li; Anders Tengholm; Erik Gylfe; Hindrik Mulder; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ATP; Ca2 ; β-cell; α-cell; SERCA; SOCE; muscarinic receptor; insulin secretion; glucagon secretion; Medical Cell Biology; Medicinsk cellbiologi;

    Sammanfattning : Glucose metabolism in pancreatic α- and β-cells is believed to regulate secretion of glucagon and insulin, respectively. In β-cells, ATP links glucose metabolism to electrical activity and insulin secretion. LÄS MER

  7. 10. On the Generation of cAMP Oscillations and Regulation of the Ca2+ Store-operated Pathway in Pancreatic Islet α- and β-cells

    Författare :Geng Tian; Erik Gylfe; Anders Tengholm; Patrick Gilon; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; cAMP; oscillations; adrenaline; GLP-1; phosphodiesterase; palmitate; STIM1; Orai1; store-operated calcium entry; insulin secretion; glucagon secretion; β-cell; α-cell; Medical Cell Biology; Medicinsk cellbiologi;

    Sammanfattning : Insulin and glucagon are released in pulses from pancreatic β- and α-cells, respectively. Both cell types are electrically excitable, and elevation of the cytoplasmic Ca2+ concentration ([Ca2+]i) due to depolarization with voltage-dependent entry of the cation is the main trigger of hormone secretion. LÄS MER