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Serum amyloid A gene expression in rabbit, mink and mouse
G Marhaug1, B Hackett, S B Dowton
1Department of Paediatrics, Washington University School of Medicine, St Louis, MO, USA.
Clinical and Experimental Immunology
|February 1, 1997
Summary
Serum amyloid A (SAA) protein expression was studied in rabbits, mink, and mice. Lipopolysaccharide (LPS) stimulation revealed widespread SAA mRNA in various organs, indicating its role in the acute-phase response.
Area of Science:
- Molecular Biology
- Immunology
- Comparative Pathology
Background:
- Serum amyloid A (SAA) is a major acute-phase protein involved in inflammation.
- Understanding SAA expression patterns across species is crucial for studying inflammatory diseases.
Purpose of the Study:
- To investigate the tissue-specific expression of SAA mRNA in rabbits, mink, and mice.
- To compare SAA expression patterns in unstimulated and lipopolysaccharide (LPS)-stimulated states across these species.
Main Methods:
- In situ hybridization was employed to detect SAA mRNA.
- Multiple organs from rabbits, mink, and mice were analyzed.
Main Results:
- Unstimulated mice and rabbits showed heterogeneous SAA expression in hepatocytes.
- LPS administration induced uniform SAA expression in hepatocytes across all species.
- In rabbits, SAA transcripts were found in spleen, adrenal cortex, ovary, small intestine, myocardium, endocardium, and kidney tubules.
- Mice showed SAA mRNA in liver, intestines, and kidney tubules after LPS.
- Mink exhibited SAA mRNA in kidney tubules and uterine endometrium post-LPS stimulation.
Conclusions:
- SAA expression is significantly upregulated in various organs following acute-phase induction by LPS.
- Species-specific differences in SAA distribution exist, particularly in extrahepatic tissues.
- SAA plays a conserved role in the acute-phase response, with distinct localization patterns.