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How do oral diabetes medicines help control blood glucose in type 2 diabetes mellitus?
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diabetes mellitus
The islets of Langerhans are responsible for the endocrine function of the pancreas. Each islet contains beta, alpha, delta, and pancreatic polypeptide (PP) cells that are responsible for the secretion of pancreatic hormones. Beta cells secrete insulin, a well-characterized hormone that plays an important role in regulating glucose metabolism.
Oral medications for type 2 diabetes mellitus manage blood glucose levels through several distinct mechanisms:
- Stimulating Insulin Release: Sulfonylureas and meglitinides (such as repaglinide and nateglinide) prompt the pancreas to secrete more insulin. Sulfonylureas act on beta cells, while meglitinides function by closing potassium channels, triggering an influx of calcium that releases insulin from storage vesicles.12
- Improving Insulin Sensitivity: Thiazolidinediones reduce insulin resistance in muscle and adipose tissues. They activate PPARγ receptors, which regulate genes involved in glucose and lipid metabolism, thereby increasing glucose transport into cells.12
- Reducing Glucose Production: Biguanides, primarily metformin, lower blood sugar by decreasing the liver's production of glucose and enhancing the effectiveness of insulin in muscle and fat tissues.12
- Inhibiting Enzymes: Drugs like sitagliptin inhibit the enzyme dipeptidyl peptidase-4 (DPP-4), which increases the levels of naturally occurring incretin hormones that stimulate insulin release.12
These treatments are essential for managing hyperglycemia when the body cannot effectively respond to its own insulin.2