Apolipoproteins in rat serum and renal lymph.

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Abstract
The concentration of apolipoproteins was measured by quantitative immunoelectrophoresis in rat serum, in the lipoprotein-free ultracentrifugal fraction (density > 1.21) of serum, and in renal lymph. The A-IV and arginine-rich apolipoproteins were present in high concentrations (> 18.5% of serum concentration) both in the fraction of density > 1.21 and in renal lymph; the other apolipoproteins were in low concentrations (< 7% of serum concentration). The major apolipoproteins of renal lymph were similar to those in the fraction of density > 1.21. The apolipoprotein composition of the renal lymph was very different from the apolipoprotein composition of serum lipoproteins. The presence of certain apolipoproteins in the fraction of density > 1.21 and in renal lymph suggests that these apolipoproteins might be present in the circulation as free apolipoproteins. The possible physiological importance of these specific apolipoproteins is postulated.