Abstract
Phosphatidylcholine exchange between rabbit erythrocytes and plasma was studied in vivo. The erythrocyte phosphatidylcholine was labeled by exchange in vivo with [32P] phosphatidylcholine and in vitro by acylation with [3H] 16∶0 and [14C] 18∶2. The erythrocytes were then injected into rabbits and the loss of labeled phosphatidylcholine from the cells by exchange was followed. The rate constants for the exchange of [32P]-, [3H] 16∶0-, and [14C] 18∶2-phosphatidylcholine were .0131±.0010, .0093±.0014 and .0074±.0013 h−1, and the exchange rates of the labels relative to that of [32P] were 1.0, 0.71±.16, and 0.56±.14, respectively. These results confirm our earlier in vitro findings and represent the first in vivo demonstration of the dependency of the exchange rate of erythrocyte phosphatdylcholines on their metabolic prehistory.
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Smith, N.B., Rubinstein, D. Exchange of phosphatidylcholine between rabbit erythrocytes and plasma in vivo. Lipids 16, 937–939 (1981). https://doi.org/10.1007/BF02535002
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DOI: https://doi.org/10.1007/BF02535002