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Insulin is a peptide hormone produced by pancreatic beta cells and encoded by the INS gene in humans.
Insulin is a peptide hormone made by the beta cells of the pancreatic islets. In humans it is encoded by the INS gene and is a key anabolic hormone that regulates metabolism of carbohydrates, fats, and proteins. By promoting glucose uptake into liver, fat, and skeletal muscle cells, insulin helps convert absorbed glucose into glycogen (via glycogenesis) and fats/triglycerides (via lipogenesis), while also inhibiting liver glucose production when blood insulin is high. Structurally, human insulin is a heterodimer consisting of an A-chain and a B-chain linked by disulfide bonds, with a total length of 51 amino acids. It is synthesized as an inactive precursor (preproinsulin → proinsulin), then processed to remove the C-peptide and produce mature insulin. Functionally, insulin secretion is tightly coupled to blood glucose: high glucose stimulates release, while low glucose suppresses it. Loss of insulin activity leads to diabetes, including type 1 (autoimmune destruction of beta cells) and type 2 (impaired beta-cell function and insulin resistance).
Insulin is a peptide hormone produced by pancreatic beta cells and encoded by the INS gene in humans.
It regulates glucose, fat, and protein metabolism by enhancing glucose uptake and promoting storage pathways while inhibiting liver glucose output.
Human insulin is a disulfide-linked A-chain/B-chain heterodimer (51 amino acids) synthesized from preproinsulin and processed through proinsulin.
Insulin secretion occurs in response to blood glucose in two phases, and impaired insulin activity contributes to diabetes (type 1 and type 2).
A hormone made of amino acids that acts as a signaling molecule in the body.
The human gene that encodes insulin, a peptide hormone produced by pancreatic beta cells.
The two peptide chains of insulin that are linked by disulfide bonds to form the active hormone.
Covalent bonds between cysteine residues that stabilize insulin’s A-chain/B-chain structure.
The inactive insulin precursor that is translated into the rough endoplasmic reticulum and processed to proinsulin.
The intermediate form of insulin that folds and is later cleaved to remove the C-peptide.
The central peptide removed from proinsulin during maturation to generate active insulin.
Pancreatic islet cells responsible for sensing blood glucose and secreting insulin.
A hormone that promotes building and storage of complex molecules from smaller ones.
A group of disorders characterized by high blood sugar due to impaired insulin activity, including type 1 and type 2 diabetes.
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