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Tạp chí quốc tế 2020
Số tạp chí 248(2020) Trang: 110752
Tạp chí: Comparative Biochemistry and Physiology, Part A

Oral administration of sucralose has been reported to stimulate food intake through inducing hypothalamic neuropeptide Y (NPY) in mice and fruitflies. However, the underlying mechanisms of action of sucralose in hypothermia and NPY and monoamine regulation remain unknown. The aim of the present study was to in-vestigate central effects of sucralose on body temperature, NPY, and monoamine regulation, as well as its peripheral effects, in chicks. In Experiment 1, 5-day-old chicks were centrally injected with 1μmol of sucralose, other sweeteners (erythritol and glucose), or saline. In Experiment 2, chicks were centrally injected with 0.2, 0.4, and 1.6μmol of sucralose or saline. In Experiment 3, chicks were centrally injected with 0.8μmol of sucralose or saline, with a co-injection of 100μg fusaric acid (FA), an inhibitor of dopamine-β-hydroxylase, to examine the role dopamine in sucralose induced hypothermia. In Experiment 4, 7–16-day-old chicks were orally adminis-tered with 75, 150, and 300 mg/2 ml distilled water or sucralose, daily. We observed that the central injection of sucralose, but not other sweeteners, decreased body temperature (P < .05) in chicks; however, the oral in-jection did not influence body temperature, food intake, and body weight gain. Central sucralose administration decreased dopamine and serotonin and stimulated dopamine turnover rate in the hypothalamus significantly (P < .05). Notably, sucralose co-injection with FA impeded sucralose-induced hypothermia. Sucralose de-creases body temperature potentially via central monoaminergic pathways in the hypothalamus.

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