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Free radicals and disease.

Jackob Moskovitz¹, Moon Bin Yim, P Boon Chock

¹Laboratory of Biochemistry, National Heart, Lung and Blood Institute, NIH, Bethesda, Maryland 20892-8012, USA.

Archives of Biochemistry and Biophysics

|February 14, 2002

Summary

Free radicals and reactive oxygen species (ROS) cause oxidative stress, damaging proteins and contributing to aging and disease. Quantifying protein carbonyls reveals age-related changes, supporting a kinetic model of oxidative damage.

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Area of Science:

Biochemistry
Gerontology
Oxidative Stress Research

Background:

Free radicals and reactive oxygen species (ROS) are implicated in disease etiology and aging.
Oxidative modification of proteins, particularly side-chain carbonyl derivatives, serves as a marker for cellular damage.
Understanding these processes is crucial for age-related disease research.

Purpose of the Study:

To quantify protein carbonyl content in relation to age.
To analyze the data using a kinetic model of protein oxidation.
To discuss the implications of free radicals in aging and neurodegenerative diseases.

Main Methods:

Quantification of protein carbonyl content in human cultured dermal fibroblasts, lens, and brain tissue across different ages.
Analysis of quantitative data using a simplified autocatalytic kinetic model.
Assessment of protein carbonyls as markers for oxidative damage and inactivation.

Main Results:

Protein carbonyl content increases with age in various human tissues.
The data align with a model where free radicals randomly oxidize proteins, leading to inactivation.
Carbonylated proteins are highly susceptible to proteolytic degradation, indicating a clearance mechanism.

Conclusions:

Free radicals and ROS play a significant role in the aging process.
Protein oxidation, marked by carbonyl derivatives, is a key factor in age-related cellular dysfunction.
The simplified kinetic model provides insights into the progression of oxidative damage and its link to age-dependent diseases.

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