Essentials of insulin pharmacokinetics

Area of Science:

• Endocrinology
• Pharmacology
• Metabolic Research

Background:

• Insulin's role in glucose homeostasis is critical.
• Understanding insulin's behavior in the body is key for managing diabetes.

Purpose of the Study:

• To detail the pharmacokinetic properties of insulin.
• To elucidate insulin's distribution, metabolism, and absorption.
• To inform optimized insulin therapy.

Main Methods:

• Analysis of plasma insulin concentration decay curves after intravenous injection.
• Calculation of insulin clearance rates and distribution volume.
• Assessment of subcutaneous insulin absorption kinetics.

Main Results:

• Insulin exhibits biphasic elimination with distinct intravascular and tissue components.
• Total insulin clearance is high (700-800 ml/min), primarily by the liver and kidneys.
• Subcutaneous absorption is slow, with variable bioavailability, dependent on insulin type.

Conclusions:

• Insulin pharmacokinetics are influenced by organ function (liver, kidneys) and absorption site.
• Diabetes mellitus generally does not alter insulin kinetics, barring complications like antibodies or resistance.
• Knowledge of insulin pharmacokinetics is essential for effective insulin replacement therapy.