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. 1991 Oct 1;88(19):8681–8685. doi: 10.1073/pnas.88.19.8681

Metabolic rate of membrane-permeant diacylglycerol and its relation to human resting T-lymphocyte activation.

Y Asaoka 1, M Oka 1, K Yoshida 1, Y Nishizuka 1
PMCID: PMC52573  PMID: 1924330

Abstract

DL-1,2-Dioctanoylglycerol (1,2-DiC8) added to human peripheral resting T lymphocytes was rapidly metabolized to produce octanoic acid and further to small molecules, probably by the action of diacylglycerol lipase and/or nonspecific esterase. Only a small portion was converted to the corresponding phosphatidic acid or was isomerized to 1,3-DiC8 before being metabolized. The uptake of 1,2-DiC8 by the cell was apparently fast, and the rate of disappearance of 1,2-DiC8 was dependent on the cell densities; at a higher density of T lymphocytes 1,2-DiC8 was removed quickly, whereas at a lower cell density 1,2-DiC8 remained for a longer period of time. With a fixed amount of 1,2-DiC8 added, the extent of interleukin 2 receptor alpha-subunit (IL-2R alpha) expression was inversely related to the cell density and proportional to the duration of exposure of the cells to 1,2-DiC8. Repeated doses of 1,2-DiC8 potentiated IL-2R alpha expression. In contrast, a single dose of phorbol 12-myristate 13-acetate caused T-lymphocyte activation to similar extents irrespective of the cell density, probably because the phorbol ester was not metabolized and remained in membranes. The available evidence supports a proposal made in a previous paper and indicates that the sustained activation of protein kinase C for at least the first 3-4 hr is essential for the activation of resting T lymphocytes.

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Selected References

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