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Insulin: Biosynthesis, Chemistry, and Preparation

Insulin: Biosynthesis, Chemistry, and Preparation

The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment primarily uses...

Insulin: The Receptor and Signaling Pathways

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are co-secreted in...

Insulin Formulations: Types and Delivery

Insulin Formulations: Types and Delivery

Insulin preparations are categorized by their duration of action into short-acting and long-acting types. Two strategies are used to modify insulin's absorption and pharmacokinetic profile: slowing the absorption post-subcutaneous injection, or altering human insulin's amino acid sequence or protein structure. These changes retain the insulin's ability to bind to the insulin receptor, but alter its behavior in solution or after injection.
Short-acting insulins are divided into rapid-acting...

Insulin Secretory Vesicles

Insulin Secretory Vesicles

Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...

Glucagon-like Receptor Agonists

Glucagon-like Receptor Agonists

Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by the...

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Related Experiment Video

Updated: Jul 12, 2026

An In Ovo Model for Testing Insulin-mimetic Compounds

An In Ovo Model for Testing Insulin-mimetic Compounds

Published on: April 23, 2018

Insulin: a model system for nanomedicine?

Manuela Koch¹, Franziska F-F Schmid, Vincent Zoete

¹Department of Chemistry, University of Basel, Basel, Switzerland.

Nanomedicine (London, England)

|August 25, 2007

Summary

Mimicking natural insulin secretion is key for diabetes management. Understanding insulin

Area of Science:

Biochemistry and Endocrinology
Metabolic Disease Research

Background:

Current insulin therapy for diabetes aims to replicate physiological insulin secretion patterns.
Effective glycemic control remains a challenge, potentially due to incomplete understanding of insulin's structure and dynamics.

Purpose of the Study:

To review current glycemic control methods and their limitations.
To explore the relationship between glycemic control challenges and knowledge gaps in insulin hormone structure and dynamics.
To propose a novel approach for less-invasive insulin administration.

Main Methods:

Review of existing literature on insulin therapy and glycemic control.
Analysis of experimental and computational studies on insulin structure and dynamics.
Conceptualization of a new method for insulin delivery.

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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

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Human Pseudoislet System for Synchronous Assessment of Fluorescent Biosensor Dynamics and Hormone Secretory Profiles

Human Pseudoislet System for Synchronous Assessment of Fluorescent Biosensor Dynamics and Hormone Secretory Profiles

Published on: November 3, 2023

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Last Updated: Jul 12, 2026

An In Ovo Model for Testing Insulin-mimetic Compounds

An In Ovo Model for Testing Insulin-mimetic Compounds

Published on: April 23, 2018

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

Published on: June 25, 2014

Human Pseudoislet System for Synchronous Assessment of Fluorescent Biosensor Dynamics and Hormone Secretory Profiles

Human Pseudoislet System for Synchronous Assessment of Fluorescent Biosensor Dynamics and Hormone Secretory Profiles

Published on: November 3, 2023

Main Results:

Current insulin administration methods have limitations in fully mimicking physiological secretion.
Insufficient knowledge regarding insulin's complex structure and dynamics hinders optimal glycemic control.
A potential strategy for less-invasive insulin administration has been identified.

Conclusions:

Further research into insulin's structure and dynamics is crucial for improving diabetes treatment.
Advancements in understanding insulin could lead to more effective and less invasive therapeutic strategies.
The proposed approach offers a promising direction for future insulin delivery systems.