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5-Hydroxytryptamine 5-HT1B receptors inhibiting cyclic AMP accumulation in rat renal mesangial cells

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Abstract

A clonal cell line derived from rat renal mesangial cells was shown to express endogenous 5-hydroxytryptamine (serotonin, 5-HT) receptors that mediate inhibition of cyclic AMP accumulation. These receptors were characterized as being of the 5-HT1B receptor subtype. 5-HT1 receptor agonists inhibited forskolin-stimulated cyclic AMP accumulation in rat renal mesangial cells (60–70% maximal inhibition) with the following rank order of potency (mean pEC50 values±SEM, n ≥ 3): ergotamine (9.58±0.51)>RU 24969 (8.67±0.23)≥5-CT (8.42±0.06)≥CP 93129 (8.15±0.27)>5-HT (7.75±0.11) > sumatriptan (6.29±0.30) > 8-OH-DPAT (4.32±0.15). 5-HT2 and 5-HT4 receptor agonists were without effect. 5-HT-induced inhibition of cyclic AMP accumulation was abolished by a pre-treatment of the cells with pertussis toxin. (-)Propranolol was a partial agonist (27% maximal inhibition, pEC50 7.19±0.24, n = 3); when used as an antagonist at 1 μM, it shifted the concentration-response curve of 5-HT to the right (pKB 7.22±0.35, n = 3). Methiothepin was a competitive antagonist of 5-HT (pA2 8.04±0.10, Schild slope 0.87±0.21, n = 3). Rauwolscine (10 μM) had no antagonist activity. There was a significant correlation (r = 0.98, P = 0.0001) between the cyclic AMP data obtained in rat mesangial cells and 5-HT1B binding data reported in rat brain cortex. The same pattern of responses was observed in early passages of primary cultures of rat mesangial cells. This study shows that rat mesangial cells can be used as a convenient source of functional 5-HT1B receptors. It also constitutes further evidence for the widespread distribution of 5-HT1B receptors outside the brain.

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Authors and Affiliations

  1. Sandoz Pharma Ltd, Preclinical Research 386/744, CH-4002, Basel, Switzerland

    P. Schoeffter & I. Bobirnac

  2. Department of Pharmacology, Biocenter, University of Basel, Klingelbergstrasse 70, CH-4056, Basel, Switzerland

    J. Pfeilschifter

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  1. P. Schoeffter
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  3. I. Bobirnac
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Schoeffter, P., Pfeilschifter, J. & Bobirnac, I. 5-Hydroxytryptamine 5-HT1B receptors inhibiting cyclic AMP accumulation in rat renal mesangial cells. Naunyn-Schmiedeberg's Arch Pharmacol 351, 35–39 (1995). https://doi.org/10.1007/BF00169061

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  • DOI: https://doi.org/10.1007/BF00169061

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