GR 113808 is a potent and selective 5-HT4 receptor antagonist with a pKb of 8.8[1]. GR 113808 can be used in the study of gastrointestinal motility disorders, neurological diseases and tumors[2, 3]. GR 113808 can attenuate morphine-stimulated dopamine release in the striatum of rats[4].
In vivo, GR 113808 (1mg/kg) treated with colitis mice by enema for 5-7 days reversed the significant improvement of Tegaserod on clinical and histological damage to the colon[5]. GR 113808 (16μg) treated with dorsal hippocampal (dHIP) injection in rats with medial forebrain bundle (MFB) lesions increased dopamine levels in the striatum, medial prefrontal cortex (mPFC), lateral habenula (LHb) and ventral hippocampus (vHIP), and increased serotonin (5-HT) levels in the LHb[6].
References:
[1] Kaumann A J. Blockade of human atrial 5-HT4 receptors by GR 113808[J]. British journal of pharmacology, 1993, 110(3): 1172.
[2] Kato S, Fujiwara I, Yoshida N. Nitrogen‐containing heteroalicycles with serotonin receptor binding affinity: Development of gastroprokinetic and antiemetic agents[J]. Medicinal research reviews, 1999, 19(1): 25-73.
[3] Guillemot J, Compagnon P, Cartier D, et al. Metoclopramide stimulates catecholamine-and granin-derived peptide secretion from pheochromocytoma cells through activation of serotonin type 4 (5-HT4) receptors[J]. Endocrine-Related Cancer, 2009, 16(1): 281.
[4] Pozzi L, Trabace L, Invernizzi R, et al. Intranigral GR-113808, a selective 5-HT4 receptor antagonist, attenuates morphine-stimulated dopamine release in the rat striatum[J]. Brain research, 1995, 692(1-2): 265-268.
[5] Spohn S N, Bianco F, Scott R B, et al. Protective actions of epithelial 5-hydroxytryptamine 4 receptors in normal and inflamed colon[J]. Gastroenterology, 2016, 151(5): 933-944. e3.
[6] Wang J W, Gao F, Wang Z L, et al. Activation and blockade of dorsal hippocampal serotonin4 receptors produce antidepressant effects in the hemiparkinsonian rats[J]. Brain Research, 2021, 1761: 147426.
















