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A comparative study of serum amyloid a protein (SAA) from mink and man
Abstract:
Serum amyloid A protein (SAA) was isolated from mink and human serum by ultra-centrifugation and gel filtration and characterized by two-dimensional gel electrophoresis and Western blotting followed by autoradiography. SAA was found in similar quantities in the high density lipoprotein (HDL) fraction of serum from a patient suffering from systemic juvenile rheumatoid arthritis (JRA) and mink stimulated with lipopolysaccharide (LPS). Only very small quantities were present in normal human controls and not detectable in normal mink. Striking similarities were found in molecular weight, isoelectric point and degree of heterogeneity for human and mink SAA, while immunologic cross-reactivity between the two species was not found. In contrast to human HDL, mink HDL was found not to contain apoA-II and only minute amounts of apoC proteins.
Insights
Serum amyloid A protein (SAA) was isolated from mink and human serum. Similar SAA quantities were found in affected humans and stimulated mink, despite species-specific HDL protein differences.
Area of Science:
- Biochemistry
- Immunology
- Comparative Medicine
Background:
- Serum amyloid A protein (SAA) is an acute-phase protein.
- Its role in systemic juvenile rheumatoid arthritis (JRA) and response to lipopolysaccharide (LPS) warrants investigation.
- Understanding SAA in different species can offer comparative insights.
Purpose of the Study:
- To isolate and characterize Serum amyloid A protein (SAA) from mink and human serum.
- To compare SAA levels in normal and stimulated states across species.
- To analyze the composition of high-density lipoprotein (HDL) fractions in mink and humans.
Main Methods:
- Ultra-centrifugation and gel filtration for SAA isolation.
- Two-dimensional gel electrophoresis and Western blotting for characterization.
- Autoradiography for detection and quantification.
Main Results:
- SAA was detected in similar quantities in human JRA patients and LPS-stimulated mink serum HDL.
- Normal human serum contained small SAA amounts, while normal mink serum had undetectable levels.
- Human and mink SAA showed similar molecular weight, isoelectric point, and heterogeneity, but lacked immunologic cross-reactivity.
- Mink HDL lacked apoA-II and had minimal apoC proteins, unlike human HDL.
Conclusions:
- Mink serve as a potential model for studying SAA, particularly in the context of inflammatory conditions.
- Despite conserved SAA properties, species-specific differences exist in HDL composition.
- Further research can elucidate the functional implications of these SAA and HDL variations.