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Serum amyloid A isoforms in inflammation.

J G Raynes1, K P McAdam

  • 1Department of Clinical Sciences, London School of Hygiene and Tropical Medicine, UK.

Scandinavian Journal of Immunology
|June 1, 1991
PubMed
Summary
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Serum amyloid A (SAA) protein isoforms, including those with and without N-terminal arginine, were identified. Variations in SAA2 beta isoform frequency and arginine handling may influence amyloid deposit formation.

Area of Science:

  • Biochemistry
  • Immunology
  • Genetics

Background:

  • Serum amyloid A (SAA) protein exists in multiple isoforms.
  • The presence and characteristics of SAA isoforms can vary geographically and potentially influence disease states.

Purpose of the Study:

  • To characterize SAA protein isoforms in human serum.
  • To investigate the geographical distribution of SAA isoforms.
  • To explore the relationship between SAA isoform characteristics and amyloidosis susceptibility.

Main Methods:

  • Serum amyloid A (SAA) protein extraction from serum using hydrophobic interaction chromatography.
  • Isoelectric focusing (IEF) to separate SAA isoforms.
  • Analysis of SAA isoform presence and concentration in sequential serum samples.

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Main Results:

  • Four to six SAA isoforms were identified, primarily differing by the presence or absence of an N-terminal arginine.
  • SAA1 and SAA2 alpha isoforms were common globally, while SAA2 beta showed higher frequency in Papua New Guinea and Malawi.
  • Des-arg isoforms generally peaked later and SAA1 isoforms decreased faster than their arginylated counterparts.

Conclusions:

  • SAA isoform profiles exhibit geographical variations.
  • The presence or absence of N-terminal arginine on SAA isoforms influences their concentration dynamics.
  • Variations in N-terminal arginine processing may play a role in the susceptibility to amyloid deposit formation.