The present study was undertaken to investigate the role of the 5-hydroxytryptamine (5-HT) ionotrophic receptor 5-HT3 in the activation of human Jurkat T-cells. 5-HT and 2-methyl-5-HT (2Me-5-HT), an agonist of the 5-HT3 receptor, induced increases in intracellular free Na+ concentrations, [Na+]i, via opening of the ionotrophic receptor in these cells. These two serotonergic (5-hydroxytryptaminergic) agents potentiated phytohaemagglutinin (PHA)-induced T-cell activation. However, they failed to potentiate dioctanoglycerol-plus-ionomycin-stimulated T-cell blastogenesis. Interestingly, an inhibitor of protein kinase C (PKC), GF 109203X, curtailed significantly 5-HT and 2Me-5-HT-potentiated T-cell activation. These results demonstrate that the opening of the 5-HT3 ionotrophic receptor is implicated in T-cell activation via the PKC pathway. Furthermore, 5-HT and 2Me-5-HT stimulated phospholipase D (PLD) activity, as measured by the production of phosphatidylethanol and phosphatidylbutanol at the expense of phosphatidic acid (PA). GF 109203X significantly curtailed the 5-HT- and 2Me-5-HT-induced PLD activity and T-cell activation. The PLD/PA pathway stimulated by these two serotonergic agents resulted in the production of 1,2-diacylglycerol (DAG) mass in Jurkat T-cells. These results altogether suggest that 5-HT and 2Me-5-HT potentiate T-cell activation via increases in [Na+]i and the activation of the PKC-dependent PLD pathway.
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Research Article|
November 08 1999
Ionotrophic 5-hydroxytryptamine type 3 receptor activates the protein kinase C-dependent phospholipase D pathway in human T-cells
Naim Akhtar KHAN;
Naim Akhtar KHAN
1
*UPRES Lipides et Nutrition, Université de Bourgogne, Faculté des Sciences-Mirande, 9 avenue Alain Savary, 21011 Dijon Cedex, France
1To whom correspondence should be addressed (e-mail Naim.Khan@u-bourgogne.fr).
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Aziz HICHAMI
Aziz HICHAMI
†Institut de Pharmacologie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
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Publisher: Portland Press Ltd
Received:
February 25 1999
Revision Received:
August 03 1999
Accepted:
September 06 1999
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London © 1999
1999
Biochem J (1999) 344 (1): 199–204.
Article history
Received:
February 25 1999
Revision Received:
August 03 1999
Accepted:
September 06 1999
Citation
Naim Akhtar KHAN, Aziz HICHAMI; Ionotrophic 5-hydroxytryptamine type 3 receptor activates the protein kinase C-dependent phospholipase D pathway in human T-cells. Biochem J 15 November 1999; 344 (1): 199–204. doi: https://doi.org/10.1042/bj3440199
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