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Fast and Specific Assessment of the Halogenating Peroxidase Activity in Leukocyte-enriched Blood Samples

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Nox enzymes in immune cells.

William M Nauseef¹

¹Inflammation Program and Department of Medicine, Roy J and Lucille A Carver College of Medicine, University of Iowa, Coralville, IA 52241, USA. william-nauseef@uiowa.edu

Seminars in Immunopathology

|May 2, 2008

Summary

Phagocyte NADPH oxidase generates reactive oxygen species to kill microbes. A broader family of Nox proteins, identified through structural similarity, plays roles in innate immunity across diverse organisms.

Area of Science:

Biochemistry
Immunology
Molecular Biology

Background:

Phagocyte NADPH oxidase is a key enzyme in host defense, producing reactive oxygen species (ROS) from NADPH and oxygen.
Flavocytochrome b (558), comprising gp91 phox and p22 phox, is the membrane-bound component essential for this process.
Previously, NADPH oxidase was believed to be exclusively expressed in phagocytes.

Purpose of the Study:

To review the characteristics of phagocyte NADPH oxidase as a model for oxidant-based host defense.
To explore the roles of the broader Nox protein family in innate immunity.

Main Methods:

Review of existing literature on NADPH oxidase structure and function.
Comparative analysis of structural homology between gp91 phox and other Nox proteins.

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Examination of studies detailing Nox protein distribution and function in various organisms.

Main Results:

The phagocyte NADPH oxidase mechanism provides a paradigm for utilizing ROS in host defense.
A conserved family of Nox proteins, related to gp91 phox, has been identified across plant and animal kingdoms.
These Nox proteins are expressed in numerous tissues and contribute to innate immunity.

Conclusions:

The phagocyte NADPH oxidase is a critical component of the innate immune system.
The discovery of the widespread Nox family expands our understanding of oxidant-based defense mechanisms beyond phagocytes.
Further research into Nox proteins promises new insights into immunity and potential therapeutic targets.