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Chapter 25

Insulin and Hypoglycemic Drugs

Chapter 25

Insulin and Hypoglycemic Drugs

Glucose Homeostasis: Regulation of Blood Glucose
Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels …
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
The pancreas comprises highly vascularized and innervated pancreatic islets, encompassing α, β, δ, PP, and ε endocrine cells. Amongst …
Insulin: The Receptor and Signaling Pathways
The insulin receptor belongs to the receptor tyrosine kinase family. It comprises disulfide-linked α/β dimers, forming a transmembrane …
Pathophysiology of Diabetes
Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The two most common types of diabetes mellitus are type 1 and type 2. …
Diabetes: Symptoms, Diagnosis, and Complications
Diabetes can be initially identified based on symptoms. Hyperglycemic patients may present common symptoms, including polyuria, polydipsia, fatigue, and …
Diabetes: Management and Pharmacotherapy
The goals of diabetes therapy include glycemic control, alleviating hyperglycemia-related symptoms, and preventing or reducing chronic end-organ …
Insulin: Biosynthesis, Chemistry, and Preparation
The pancreatic β-cell's endoplasmic reticulum synthesizes preproinsulin comprising a signal peptide, B and A chains, and a C-peptide. The …
Insulin Formulations: Types and Delivery
Insulin preparations, based on their duration of action, are categorized as short-acting and long-acting. Short-acting regular insulin forms hexamers, …
Insulin: Dosing Regimen and Adverse Effects
Insulin dosage regimens generally include a mixture of analogs given as daily injections. Typically, most patients are prescribed long and short-acting …
Oral Hypoglycemic Agents: Sulfonylureas
Sulfonylureas are a class of insulin secretagogues. They are used as oral hypoglycemic agents for managing Type 2 diabetes. Structurally, these drugs …
Oral Hypoglycemic Agents: Biguanides and Glitazones
Biguanides are insulin sensitizers that enhance glucose uptake, reducing insulin resistance. Unlike sulfonylureas, they do not stimulate insulin …
Oral Hypoglycemic Agents: Glinides
Glinides are insulin secretagogues that trigger insulin release from β cells by inhibiting KATP channels and controlling potassium efflux. They share …
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors
α-glucosidase inhibitors impede intestinal α-glucosidase enzymes, delaying the digestion of starch and disaccharides. This effectively curtails …
Glucagon-like Receptor Agonists
Oral glucose intake triggers gut hormones like GLP-1 and GIP called incretins, which stimulate insulin secretion. Both GLPs and glucagon originate from …
Dipeptidyl Peptidase 4 Inhibitors
Dipeptidyl peptidase 4, or DPP-4 inhibitors, called gliptins inhibit incretin hormone inactivation. These drugs bind to DPP-4,  increasing the levels …
Hypoglycemia and Glucagon
Without prolonged fasting, healthy individuals maintain blood glucose levels >80 mg/dL due to a well-adapted neuroendocrine system. However, …
Studying the Hypothalamic Insulin Signal to Peripheral Glucose Intolerance with a Continuous Drug Infusion System into the Mouse Brain
Insulin regulates systematic metabolism in the hypothalamus and the peripheral insulin response. An inflammatory reaction in peripheral adipose tissues …
An In Ovo Model for Testing Insulin-mimetic Compounds
Elevated blood glucose levels in type 2 diabetes mellitus (T2DM), a complex and multifactorial metabolic disease, are caused by insulin resistance and …
Self-Administration of Drugs in Mouse Models of Feeding and Obesity
Preclinical studies in mice often rely on invasive protocols, such as injections or oral gavage, to deliver drugs. These stressful routes of …