Acute phase protein

Inflammatory cells and red blood cells

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List of terms related to Acute phase protein

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Acute-phase proteins are a class of proteins whose plasma concentrations increase (positive acute phase proteins) or decrease (negative acute phase proteins) in response to inflammation. This response is called the acute-phase reaction (also called acute phase response).

In response to injury, local inflammatory cells (neutrophil granulocytes and macrophages) secrete a number of cytokines into the bloodstream, most notable of which are the interleukins IL-1, IL-6 and IL-8, and TNF-α.

The liver responds by producing a large number of acute-phase reactants.

Examples

The notable are:

• D-dimer protein
• C-reactive protein
• Mannose-binding protein
• Alpha 1-antitrypsin
• Alpha 1-antichymotrypsin
• Alpha 2-macroglobulin
• some coagulation factors (Fibrinogen, prothrombin, factor VIII, von Willebrand factor, plasminogen)
• Complement factors
• Ferritin
• Serum amyloid P component (see amyloid)
• Serum amyloid A
• Prealbumin

Serum albumin concentrations fall in acute disease states. For this reason albumin is sometimes referred to as a negative acute phase protein.

Clinical significance

Measurement of acute phase proteins is a useful marker of inflammation in both medical and veterinary clinical pathology. It correlates with the erythrocyte sedimentation rate (ESR).

External links

• MeSH Acute-Phase+Proteins

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