Abstract
The main focus of the serum amyloid A (SAA) family has been on the acute phase isoforms. However, the constitutive isoform (SAA4) may have a strong effect on the metabolism of human serum lipoproteins. In this study, the SAA4 protein was examined in the high-density lipoprotein fraction of both healthy and diseased individuals. Novel isoforms of SAA4 were detected using ultracentrifugation combined with solid-phase extraction and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). Three truncated isoforms were identified as well as two glycosylated isoforms. Patterns of isoform distribution may be significant for assessment of cardiovascular risk as well as direction of patient treatment.
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