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Serotonin 5-HT7 receptors coupled to induction of interleukin-6 in human microglial MC-3 cells.

Mahe, Cecile, Loetscher, Erika, Dev, Kumlesh K., Bobirnac, Ionel, Otten, Uwe and Schoeffter, Philippe (2005) Serotonin 5-HT7 receptors coupled to induction of interleukin-6 in human microglial MC-3 cells. Neuropharmacology, 49 (1). pp. 40-47. ISSN 0028-3908


Brain serotonin 5-HT(7) receptors are known to be expressed in neurons and astrocytes. We now report the presence of these receptors in a third type of cell, microglial cells. 5-Hydroxytryptamine (5-HT), 5-carboxamidotryptamine (5-CT), 5-methoxytryptamine (5-MeOT) and 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) induced concentration-dependent stimulations of cAMP accumulation in the human microglial MC-3 cell line. The maximal effect of 5-HT was 3.4+/-0.3-fold stimulation (mean+/-S.E.M., n=5) above basal levels. The rank order of agonist potency (pEC50 values) was 5-CT (7.09)>5-HT (6.13)>or=5-MeOT (5.78)>>8-OH-DPAT (ca. 5). The effect of 5-CT was inhibited in a concentration-dependent manner by the selective 5-HT7 receptor antagonist SB-269970 (pA2 value 9.03). Western blot analysis revealed the presence of immunoreactive bands corresponding to the human 5-HT7 receptor in extracts of MC-3 cells. The presence of two splice variants of the 5-HT7 receptor (5-HT7(a/b)) was visualized by reverse transcriptase-polymerase chain reaction (RT-PCR) analysis with specific primers. In real-time PCR studies, the mRNA for interleukin-6 (IL-6) was found to be increased by 2.5-fold in MC-3 cells after 1 h incubation with 5-CT (1 microM) and this effect was fully blocked by the 5-HT7 receptor antagonist SB-269970 (1 microM). These data show that functional 5-HT7 receptors are present in human microglial MC-3 cells, suggesting that they are involved in neuroinflammatory processes.

Item Type: Article
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Additional Information: author can archive post-print (ie final draft post-refereeing); Publisher's version/PDF cannot be used
Keywords: 5-HT7 receptor; Human microglial cells; SB-269970; Interleukin-6
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Date Deposited: 14 Dec 2009 13:57
Last Modified: 31 Jan 2013 01:13


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