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Ch. 16 - Innate Immunity: Nonspecific Defenses of the Host
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTortora 14th EditionCh. 16 - Innate Immunity: Nonspecific Defenses of the HostProblema 5
Capitolo 12, Problema 5

Patients with X-linked chronic granulomatous disease are susceptible to infections because their neutrophils don’t generate an oxidative burst. What is the relation of the oxidative burst to infection?

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Understand that the oxidative burst is a rapid release of reactive oxygen species (ROS) by neutrophils and other phagocytes during the immune response to pathogens.
Recognize that ROS, such as superoxide anion (O2-) and hydrogen peroxide (H2O2), are toxic molecules that help kill engulfed microbes inside phagosomes.
Know that in X-linked chronic granulomatous disease (CGD), mutations affect the NADPH oxidase enzyme complex, which is responsible for producing superoxide anion during the oxidative burst.
Realize that without the oxidative burst, neutrophils cannot effectively generate ROS, leading to impaired killing of certain bacteria and fungi, resulting in increased susceptibility to infections.
Summarize that the oxidative burst is crucial for the intracellular destruction of pathogens, and its absence in CGD patients explains their vulnerability to recurrent and severe infections.

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Oxidative Burst in Neutrophils

The oxidative burst is a rapid release of reactive oxygen species (ROS) by neutrophils during phagocytosis. These ROS, such as superoxide and hydrogen peroxide, are toxic to engulfed pathogens and help kill bacteria and fungi inside the phagosome.
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Chronic Granulomatous Disease (CGD)

CGD is a genetic disorder where neutrophils lack a functional NADPH oxidase enzyme, preventing the oxidative burst. This defect impairs the ability to kill certain bacteria and fungi, leading to recurrent and severe infections.
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Chronic & Latent Infection Disease Progression

Role of Neutrophils in Innate Immunity

Neutrophils are key innate immune cells that engulf and destroy pathogens through phagocytosis and oxidative burst. Their failure to generate ROS compromises the first line of defense, increasing susceptibility to infections.
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Introduction to Innate Immunity
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