Which of the following statements about endotoxin is true?...

Which of the following statements about endotoxin is true? It
a) is an example of an A-B toxin.
b) is a component Gram-positive bacteria.
c) can be converted to a toxoid.
d) is heat-stable.
e) causes T cells to release cytokines.

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Key Concepts

Heat Stability

Heat stability refers to the characteristic of a substance to retain its structure and function even after being exposed to high temperatures. Endotoxins are notably heat-stable, meaning they do not easily denature when heated, which is an important feature distinguishing them from many protein-based toxins.

Endotoxins

Endotoxins are components of the outer membrane of Gram-negative bacteria, composed primarily of lipopolysaccharide (LPS). They are not secreted but are released when bacteria lyse, and they play a significant role in triggering inflammatory responses in the host.

Exotoxin versus Endotoxin

Bacterial toxins can be classified into exotoxins and endotoxins. Exotoxins are typically proteins secreted by bacteria following an A-B model, while endotoxins are heat-stable, non-protein components inherent to the bacterial cell wall of Gram-negative organisms.

Immune Activation

Endotoxins induce a significant immune response by activating host immune cells. This activation leads to the release of pro-inflammatory cytokines, which can contribute to systemic effects such as fever and, in severe cases, septic shock.

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