Up-regulation of lymphocytic cholinergic activity by ONO-4819, a selective prostaglandin EP4 receptor agonist, in MOLT-3 human leukemic T cells

We used a selective EP4 receptor agonist, ONO-4819, and a human leukemic T cell line MOLT-3 cells, which express all four prostaglandin E2 (PGE2) receptors (EP1-EP4), to investigate whether the EP4 PGE2 receptor subtype is involved in regulating lymphocytic cholinergic activity. Phytohemagglutinin (...

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Published in:Vascular pharmacology 2004-03, Vol.41 (2), p.51-58
Main Authors: Suenaga, Aya, Fujii, Takeshi, Ogawa, Hiroshi, Maruyama, Takayuki, Ohuchida, Shuichi, Katsube, Nobuo, Obata, Takaaki, Kawashima, Koichiro
Format: Article
Language:English
Subjects:
Acetylcholine - biosynthesis
Acetylcholine - secretion
Cell Line, Tumor
Choline O-Acetyltransferase - biosynthesis
Heptanoates - pharmacology
Humans
Leukemia, T-Cell - metabolism
Receptors, Prostaglandin E - agonists
Receptors, Prostaglandin E - biosynthesis
Receptors, Prostaglandin E, EP4 Subtype
RNA, Messenger - biosynthesis
T-Lymphocytes - drug effects
T-Lymphocytes - metabolism
Up-Regulation - drug effects
Up-Regulation - physiology
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Summary:We used a selective EP4 receptor agonist, ONO-4819, and a human leukemic T cell line MOLT-3 cells, which express all four prostaglandin E2 (PGE2) receptors (EP1-EP4), to investigate whether the EP4 PGE2 receptor subtype is involved in regulating lymphocytic cholinergic activity. Phytohemagglutinin (PHA), a T cell activator, significantly enhanced the expression of EP4 receptor mRNA during the first 3-6 h of exposure, after which, expression gradually declined. Furthermore, PHA stimulation slightly but significantly up-regulated the expression of EP2 mRNA after 12 h and of EP3 mRNA after 6 h. By contrast, expression level of EP1 receptor mRNA was not affected by PHA. ONO-4819 (1 microM), which was added to cultures after 3 h of PHA stimulation, significantly increased cellular ACh content and release, and up-regulated ChAT mRNA expression and activity but inhibited MOLT-3 cell proliferation. These findings suggest that the activation of T lymphocytes up-regulates EP4 receptor mRNA expression and, to a lesser extent, EP2 and EP3 receptors and that PGE2 enhances nonneuronal lymphocytic cholinergic transmission in activated T cells, at least in part, via EP4 receptor-mediated pathways.
ISSN:1537-1891
DOI:10.1016/j.vph.2004.03.006