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First Evidence for the Existence of Multiple Isoforms of Bovine Serum Amyloid‐A (apoSAA)

Bovine serum amyloid‐A (SAA) was purified from acute‐phase high density iipoprotein (HDL) by affinity chromatography and subsequent gel filtration chromatography. The identity of the isolated protein was checked by Western blotting following SDS‐urea‐PAGE using antisera raised against the purified protein fraction (SAA) and Amyloid A (AA). The antiserum raised against the purified SAA stained Congo red positive regions in the kidney of an AA‐amyloidotic cow and reacted on Western blot with an AA‐related protein of approximately 14kDa. Moreover, it immunostained two to three bands, of approximately 14kDa, present in serum from diseased cows, proportionally to the serum SAA concentration as measured by ELISA.