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Serum amyloid A
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Serum amyloid A

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Human Serum amyloid A1
Identifiers
Symbol SAA1
NCBI gene 6288
HGNC 10513
OMIM 104750
RefSeq NM_199161
UniProt P0DJI8
Other data
Locus Chr. 11 p15.1
Search for
Structures Swiss-model
Domains InterPro
Human Serum amyloid A2
Identifiers
Symbol SAA2
NCBI gene 6289
HGNC 10514
OMIM 104751
RefSeq NM_030754
UniProt P02735
Other data
Locus Chr. 11 p15.1-p14
Search for
Structures Swiss-model
Domains InterPro
Human Serum amyloid A3, pseudogene
Identifiers
Symbol SAA3P
Alt. symbols SAA3
NCBI gene 6290
HGNC 10515
UniProt P22614
Other data
Locus Chr. 11 p15.1-p14
Search for
Structures Swiss-model
Domains InterPro
Human Serum amyloid A4
Identifiers
Symbol SAA4
Alt. symbols C-SAA
NCBI gene 6291
HGNC 10516
OMIM 104752
RefSeq NM_006512
UniProt P35542
Other data
Locus Chr. 11 p15.1-p14
Search for
Structures Swiss-model
Domains InterPro

Serum amyloid A (SAA) proteins are a family of apolipoproteins associated with high-density lipoprotein (HDL) in plasma. Different isoforms of SAA are expressed constitutively (constitutive SAAs) at different levels or in response to inflammatory stimuli (acute phase SAAs). These proteins are produced predominantly by the liver.

Acute-phase serum amyloid A proteins

Acute-phase serum amyloid A proteins (A-SAAs) are secreted during the acute phase of inflammation. These proteins have several roles, including the transport of cholesterol to the liver for secretion into the bile, the recruitment of immune cells to inflammatory sites, and the induction of enzymes that degrade extracellular matrix. A-SAAs are implicated in several chronic inflammatory diseases, such as amyloidosis, atherosclerosis, and rheumatoid arthritis. Three acute-phase SAA isoforms have been reported in mice, called SAA1, SAA2, and SAA3. During inflammation, SAA1 and SAA2 are expressed and induced principally in the liver, whereas SAA3 is induced in many distinct tissues. SAA1 and SAA2 genes are regulated in liver cells by the proinflammatory cytokines IL-1, IL-6, and TNF-α. Both SAA1 and SAA2 are induced up to a 1000-fold in mice under acute inflammatory conditions following exposure to bacterial lipopolysaccharide (LPS). Three A-SAA genes have also been identified in humans, although the third gene, SAA3, is believed to represent a pseudogene that does not generate messenger RNA or protein. Molecular weights of the human proteins are estimated at 11.7 kDa for SAA1 and 12.8 kDa for SAA4.

Serum amyloid A (SAA) is also an acute phase marker that responds rapidly. Similar to CRP, levels of acute-phase SAA increase within hours after inflammatory stimulus, and the magnitude of increase may be greater than that of CRP. Relatively trivial inflammatory stimuli can lead to SAA responses. It has been suggested that SAA levels correlate better with disease activity in early inflammatory joint disease than do ESR and CRP. Although largely produced by hepatocytes, more recent studies show that SAA is produced by adipocytes as well, and its serum concentration is associated with body mass index.

Constitutive serum amyloid A proteins

A fourth SAA (SAA4) was identified in humans and is expressed constitutively in the liver and, thus, is defined as a constitutive SAA (C-SAA). A similar protein that is now also called SAA4 has since been identified in the mouse; it had originally been designated SAA5.


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