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== Introduction ==

[[File:41541 2019 132 Fig2 HTML.webp|thumb|right|450px|Acute-Phase Proteins in response to inflammation]]

'''Acute-phase proteins (APPs)''' are a class of proteins that play a vital role in the body's immediate response to inflammation. These proteins exhibit changes in their plasma concentrations, with some increasing (positive acute-phase proteins) and others decreasing (negative acute-phase proteins) in response to inflammatory stimuli. This response is known as the '''acute-phase reaction''' or '''acute-phase response'''. In this article, we delve into the significance of acute-phase proteins, their role in inflammation, and the key characteristics of the acute-phase reaction.

== Acute-Phase Proteins: An Overview ==

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=== Classification ===
Acute-phase proteins are classified based on their behavior during inflammation:
* '''Positive Acute-Phase Proteins''': These proteins exhibit an increase in their plasma concentrations during inflammation. They are often involved in promoting various immune responses and tissue repair mechanisms.
* '''Negative Acute-Phase Proteins''': Conversely, negative acute-phase proteins show a decrease in their plasma concentrations in response to inflammation.

=== Acute-Phase Reaction ===
[[File:Fimmu-11-01648-g004.jpg|thumb|left|300px|Inflammatory response leading to the acute-phase reaction]]
The acute-phase reaction is a complex process initiated by the body when it encounters inflammatory stimuli. Key characteristics of the acute-phase reaction include:
* Development of fever
* Acceleration of peripheral [[leukocytes|white blood cells]]
* Increased levels of circulating neutrophils and their precursors

== Significance of Acute-Phase Proteins ==
Acute-phase proteins serve several crucial functions in response to inflammation:

=== Immune Response ===
Positive acute-phase proteins, such as C-reactive protein (CRP) and serum amyloid A (SAA), actively participate in the immune response. They contribute to the opsonization of pathogens, enhancing their removal by phagocytes.

=== Tissue Repair ===
Some acute-phase proteins, like fibrinogen, play a vital role in blood clotting and tissue repair mechanisms. They help in sealing wounds and preventing excessive bleeding.

=== Negative Acute-Phase Proteins ===
Negative acute-phase proteins, like albumin, can decrease during inflammation. Albumin reduction reflects altered liver function and is associated with systemic inflammation and malnutrition.

== Clinical Significance ==
[[File:Rouleaux Red Cells.jpg|thumb|right|300px|Blood testing to measure acute-phase protein levels]]
Acute-phase proteins have significant clinical relevance, as they are used as biomarkers to assess the presence and severity of inflammatory conditions. Blood tests that measure the levels of these proteins can provide valuable diagnostic information and help guide treatment decisions.

== Examples of Acute-Phase Proteins ==
Several acute-phase proteins have been identified in the body, including but not limited to:
* C-reactive protein (CRP)
* Serum amyloid A (SAA)
* Fibrinogen
* Haptoglobin
* Alpha-1-acid glycoprotein (AGP)
* Ferritin

== Conclusion ==
Acute-phase proteins are integral components of the body's immediate response to inflammation. Their dynamic changes in plasma concentrations serve as important indicators of inflammatory conditions and play diverse roles in the immune response, tissue repair, and overall health. Understanding the significance of acute-phase proteins is crucial in diagnosing and managing various medical conditions associated with inflammation.

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Acute-phase protein - Revision history

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