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Alpha cells produce less glucagon in response to rising glucose levels, and more glucagon if blood glucose is low. Glucagon serves as a signal to the liver to break down glycogen and release glucose into the blood. Glucokinase in beta cells serves as a glucose sensor, amplifying insulin secretion as blood glucose rises.
The glucokinase regulatory protein (GKRP) also known as glucokinase (hexokinase 4) regulator (GCKR) is a protein produced in hepatocytes (liver cells). GKRP binds and moves glucokinase (GK), thereby controlling both activity and intracellular location [1] [2] of this key enzyme of glucose metabolism. [3] GKRP is a 68 kD protein of 626 amino acids.
MODY 2 or GCK-MODY is a form of maturity-onset diabetes of the young. [1] It is due to any of several mutations in the GCK gene on human chromosome 7 for glucokinase. [2] Glucokinase serves as the glucose sensor for the pancreatic beta cell. Normal glucokinase triggers insulin secretion as the glucose exceeds about 90 mg/dl (5 mM).
Glucose homeostasis, when operating normally, restores the blood sugar level to a narrow range of about 4.4 to 6.1 mmol/L (79 to 110 mg/dL) (as measured by a fasting blood glucose test). [ 10 ] The global mean fasting plasma blood glucose level in humans is about 5.5 mmol/L (100 mg/dL); [ 11 ] [ 12 ] however, this level fluctuates throughout ...
Normal insulin levels (e.g. 2.6-24.9) Absence of obesity (although overweight or obese people can get MODY) or other problems associated with type 2 diabetes or metabolic syndrome (e.g., hypertension, hyperlipidemia, polycystic ovary syndrome). [11] Insulin resistance very rarely happens. [12] Cystic kidney disease in patient or close relatives.
Map of effects in GSDIa from non-functioning glucose-6-phosphatase. The hypoglycemia of GSD I is termed "fasting", or "post-absorptive", usually about 4 hours after the complete digestion of a meal. This inability to maintain adequate blood glucose levels during fasting results from the combined impairment of both glycogenolysis and ...
When the glucose concentration outside the cell is high, glucose molecules move into the cell by facilitated diffusion, down its concentration gradient through the GLUT2 transporter. [15] Since beta cells use glucokinase to catalyze the first step of glycolysis, metabolism only occurs around physiological blood glucose levels and above. [4]
The gene product is a regulatory protein that inhibits glucokinase in liver and pancreatic islet cells by binding non-covalently to form an inactive complex with the enzyme. This gene is considered a susceptibility gene candidate for a form of maturity onset diabetes of the young (MODY). [provided by RefSeq, Jul 2008].
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