The quantitative study of the rate, speed, and efficiency with which the body’s various detoxification systems process and eliminate the non-essential or toxic byproducts generated from normal cellular metabolism and external exposures. This physiological process is critical for maintaining cellular homeostasis and preventing the accumulation of cytotoxic compounds. Optimal kinetics are a hallmark of youth and a key target for longevity interventions.
Origin
This term is a specialized application of chemical kinetics within the context of human physiology and toxicology, focusing on the body’s internal clearance mechanisms. It draws from concepts in renal physiology, hepatic detoxification, and the study of cellular efflux transporters. The concept gains clinical significance in aging, where reduced organ function slows the elimination rate of waste products.
Mechanism
The kinetics involve a multi-organ system, primarily the liver and kidneys, working in concert. The liver uses Phase I (oxidation, reduction, hydrolysis) and Phase II (conjugation) enzymatic reactions to render lipophilic toxins water-soluble. The kidneys then filter these water-soluble compounds from the blood for urinary excretion. The rate of these processes is governed by enzyme activity and blood flow, both of which can be modulated by nutritional status and hormonal signaling.
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