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Multifaceted Disease: Type 2 Diabetes

Decent Essays

Type 2 diabetes is a complex, multifaceted disease with numerous factors contributing to hyperglycemia. Ultimately it can best be characterized as a disease of insulin resistance and progressive beta cell failure, but numerous factors contribute to each. Non-modifiable risk factors for developing type 2 diabetes include genetics and age. Beta-cell dysfunction and insulin resistance are both inheritable traits. Researches have identified some 50 loci (specific location of a gene) associated with insulin concentration and glucose, while 32 have known associations with type 2 diabetes. Additionally, advancing age is associated with diminished beta cell responsiveness. Modifiable risk factors include weight and environmental factors such …show more content…

The organs involved include the liver, muscle, fat cells, liver, alpha and beta cells of the pancreas, GI tract, kidney, and brain. While the liver and muscle ideally increase glucose uptake in the fed state when insulin levels are high, with type 2 diabetes this is impaired. To further exacerbate the hyperglycemic condition, the liver not only fails to properly exhibit glucose uptake, but it actually over produces more glucose and thereby creates a cycle of glucose accumulation and further production. While this is occurring in the muscle and liver, fat cells have accelerated lipolysis. The lipolysis results in an increase in plasma free fatty acids (FFAs), which then in-turn impairs both first and second phase insulin secretion and can lead to excess fat deposition in the liver and muscle, contributing further to impaired insulin production. At the GI tract, gastric inhibitory polypeptide becomes resistant and loss of GLP-1 occurs. With impaired GLP-1, insulin resistance is again further enabled and hyperglycemia can become more profound. This occurs because glucagon suppression from the pancreatic alpha cells post meal does not occur as it would under normal circumstances, thereby enabling even more hepatic glucose production. While theories are not completely conclusive, insulin resistance in the hypothalamus may contribute to excess intake thereby contributing to additional glucose in the circulation. Finally, the kidney also plays a role in glucose dysregulation as it increases glucose reabsorption. All of these discussed mechanisms ultimately contribute to hyperglycemia and chronic hyperglycemia itself contributes to impaired beta cell function (DeFronzo,

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