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Insulin is a peptide hormone containing two chains cross-linked by disulfide bridges. Insulin (/ ˈ ɪ n. sj ʊ. l ɪ n /, [5] [6] from Latin insula, 'island') is a peptide hormone produced by beta cells of the pancreatic islets encoded in humans by the insulin (INS) gene. It is the main anabolic hormone of the body. [7]
One international unit of insulin (1 IU) is defined as the "biological equivalent" of 34.7 μg pure crystalline insulin. [citation needed] The first definition of a unit of insulin was the amount required to induce hypoglycemia in a rabbit. This was set by James Collip at the University of Toronto in 1922. Of course, this was dependent on the ...
[1] Protamine insulin was first created in 1936 and NPH insulin in 1946. [1] It is on the World Health Organization's List of Essential Medicines. [4] NPH is an abbreviation for "neutral protamine Hagedorn". [1] In 2020, insulin isophane was the 221st most commonly prescribed medication in the United States, with more than 2 million prescriptions.
Regular insulin, also known as neutral insulin and soluble insulin, is a type of short-acting medical insulin. [2] It is used to treat type 1 diabetes , type 2 diabetes , gestational diabetes , and complications of diabetes such as diabetic ketoacidosis and hyperosmolar hyperglycemic states . [ 5 ]
Examples of rapid-acting insulins (peak at ~1 hour) are: [citation needed] Insulin lispro (Humalog) Insulin aspart (Novolog) Insulin glulisine (Apidra) Examples of short-acting insulins (peak 2–4 hours) are: Regular insulin (Humulin R, Novolin R) Prompt insulin zinc (Semilente) Examples of intermediate-acting insulins (peak 4–10 hours) are:
The insulin aspart protamine portion is a crystalline form of insulin aspart, which delays the action of the insulin, giving it a prolonged absorption profile after injection. [14] The combination of the fast-acting form and the long-acting form allows the patient to receive fewer injections over the course of the day.
Conventional insulin therapy is characterized by: Insulin injections of a mixture of regular (or rapid) and intermediate acting insulin are performed two times a day, or to improve overnight glucose, mixed in the morning to cover breakfast and lunch, but with regular (or rapid) acting insulin alone for dinner and intermediate acting insulin at bedtime (instead of being mixed in at dinner).
An insulin analog (also called an insulin analogue) is any of several types of medical insulin that are altered forms of the hormone insulin, different from any occurring in nature, but still available to the human body for performing the same action as human insulin in terms of controlling blood glucose levels in diabetes.