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• W1821391444 abstract "Background Corticotropin-releasing factor (CRF) signaling induced by stress is well established to delay gastric emptying (GE) and stimulate colonic functions. The somatostatin receptor (sst1–5) agonist, ODT8-SST acts in the brain to inhibit stress-induced adrenocorticotropic hormone and epinephrine secretion. We investigated whether ODT8-SST acts in the brain to influence stress-related alterations of gastric and colonic motor function and sst receptor subtype(s) involved. Methods Peptides were injected intracerebroventricularly (i.c.v.) under short isoflurane anesthesia and GE, fecal pellet output (FPO) and distal colonic motility monitored in conscious mice. Key Results The stress of acute anesthesia/vehicle i.c.v. injection reduced GE by 67% and increased defecation by 99% compared to non-injected controls. Both responses were abolished by ODT8-SST (1 μg = 0.75 nmol) or sst1 agonist (0.65–1.95 nmol). The sst1 agonist (1.95 nmol) also prevented the abdominal surgery-induced delayed GE. Octreotide (sst2 > sst5 > sst3) and the sst2 or sst4 agonists (1 μg = 0.78 or 0.70 nmol, respectively) injected i.c.v. did not influence FPO while i.c.v. somatostatin-28 mimicked ODT8-SST’s effect. The ODT8-SST-induced increased food intake was inhibited by i.c.v. sst2 antagonist while the reduced FPO was unchanged. ODT8-SST i.c.v. reduced distal colonic motility in semi-restrained mice compared with vehicle and blocked water avoidance- and i.c.v. CRF (0.5 μg = 0.09 nmol)-induced stimulated FPO while a similar colonic secretomotor response to i.p. 5-hydroxytryptophane (10 mg kg−1 = 36.4 μmol kg−1) was unaltered. Conclusions & Inferences ODT8-SST counteracts stress/i.c.v. CRF-related stimulation of colonic motor function and delayed GE which can be reproduced mainly by activation of sst1 receptors. These data opens new insight to brain somatostatinergic signaling pathways interfering with brain circuitries involved in gut motor responses to acute stress." @default.
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• W1821391444 date "2011-05-12" @default.
• W1821391444 modified "2023-10-14" @default.
• W1821391444 title "Central somatostatin receptor 1 activation reverses acute stress-related alterations of gastric and colonic motor function in mice" @default.
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• W1821391444 doi "https://doi.org/10.1111/j.1365-2982.2011.01706.x" @default.
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