The Journal of Experimental Medicine, Vol 94, 431-453,
Copyright, 1951, by The Rockefeller Institute for Medical Research New York
THE DOMINANT ROLE OF THE LIVER IN PLASMA PROTEIN SYNTHESIS
:
A DIRECT STUDY OF THE ISOLATED PERFUSED RAT LIVER WITH THE AID OF LYSINE-
-C14
L. L. Miller M.D.1,
C. G. Bly M.D.1,
M. L. Watson 1, and
W. F. Bale Ph.D.1
1 From the Departments of Radiation Biology and Pathology, The University of Rochester School of Medicine and Dentistry, Rochester, New York
A direct study of the isolated rat liver perfused with oxygenated blood containing amino acids and lysine--C14 has yielded facts indicating that the liver synthesizes practically all the plasma fibrinogen, the albumin fraction, and probably more than 80 per cent of the plasma globulin fraction.
The response of the isolated perfused liver in protein synthesis is qualitatively and quantitatively analogous to that of the intact animal, notably in (a) the ability to discriminate between natural L-lysine and D-lysine, (b) the per cent of isotopic amino acid converted to CO2, (c) the per cent utilized in liver and plasma protein synthesis.
The results obtained with the perfused liver are compared and contrasted with those reported for tissue homogenates, minces, and slices.
Submitted on July 18, 1951
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