Which of the following helps in generating reactive 02 intermediates in neutrophils?
**Core Concept**
The process of generating reactive oxygen intermediates (ROIs) in neutrophils is crucial for their antimicrobial activity. This process involves the activation of a multi-enzyme complex known as NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen, resulting in the formation of superoxide anion (O2-).
**Why the Correct Answer is Right**
The correct answer is NADPH oxidase, which is a key enzyme complex responsible for the production of reactive oxygen intermediates in neutrophils. This complex consists of several subunits, including gp91phox and p22phox, which are essential for its activity. When activated, NADPH oxidase catalyzes the transfer of electrons from NADPH to molecular oxygen, resulting in the formation of superoxide anion (O2-), which is a precursor to other reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) and hydroxyl radicals (OH•).
**Why Each Wrong Option is Incorrect**
* **Option A:** Although myeloperoxidase is an enzyme involved in the antimicrobial activity of neutrophils, it is not directly involved in the generation of reactive oxygen intermediates.
* **Option B:** Neither cytochrome b2 nor cytochrome c is directly involved in the generation of reactive oxygen intermediates in neutrophils.
* **Option D:** Although NADH dehydrogenase is an enzyme involved in the electron transport chain, it is not directly involved in the generation of reactive oxygen intermediates in neutrophils.
**Clinical Pearl / High-Yield Fact**
The production of reactive oxygen intermediates by neutrophils is an essential mechanism for their antimicrobial activity, and it is often referred to as the "respiratory burst."
**Correct Answer:** C. NADPH oxidase. NADPH oxidase.