Nicotine's attenuation of body weight involves the perifornical hypothalamus.

Nicotine's attenuation of body weight involves the perifornical hypothalamus.
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尼古丁对体重的减弱涉及穹窿周下丘脑。

DOI:
10.1016/j.lfs.2007.06.010
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发表时间:
2007
期刊:
影响因子:
6.1
通讯作者:
Bellinger,LarryL
Bellinger,LarryL
中科院分区:
医学2区
文献类型:
--
作者:
Kramer,PhillipR;Guan,Guoqiang;Wellman,PaulJ;Bellinger,LarryL

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以前我们发现,间歇性给予尼古丁(NIC)在黑暗阶段减少食物摄入量和体重,这可以被阻止时,NIC受体拮抗剂美加明注入第四脑室。邻近第四脑室的儿茶酚胺能神经元含有NIC受体,并直接支配穹窿周围下丘脑(PFH),PFH已被证明参与摄食的调节。本研究探讨了NIC是否通过调节向PFH的儿茶酚胺能输入来调节摄食行为。肾上腺素和去甲肾上腺素神经元的输入消融PFH内的6-羟基多巴胺氢溴酸盐(6-OHDA),而安非他酮输注,以保护多巴胺能神经元。体重恢复至术前水平后,在间歇性NIC注射后测量摄食量、膳食量、膳食次数和体重。结果表明,PFH损伤的动物没有表现出典型的长期下降的食物摄入量,膳食量和体重通常与NIC的管理。高效液相色谱分析表明,与对照大鼠相比,6-OHDA给药显著降低PFH去甲肾上腺素和肾上腺素水平,但不降低多巴胺水平。这些结果与NIC通过PFH内的或延伸通过PFH的儿茶酚胺能神经元起作用而部分地减少食物摄入一致。
Previously we showed that intermittent administration of nicotine (NIC) in the dark phase decreased food intake and body weight and this could be blocked when the NIC receptor antagonist mecamylamine was infused into the fourth ventricle. Catecholaminergic neurons adjacent to the fourth ventricle contain NIC receptors and directly innervate the perifornical hypothalamus (PFH) which has been shown to be involved in regulation of feeding. This study explored whether NIC regulates feeding behavior by modulating catecholaminergic input to the PFH. Epinephrine and norepinephrine neuronal input was ablated within the PFH by infusion of 6-hydroxydopamine hydrobromide (6-OHDA), while bupropion was infused to protect dopaminergic neurons. After recovery of body weights to pre-surgery levels, food intake, meal size, meal number and body weight were measured after intermittent NIC injections. The results showed the PFH lesioned animals did not exhibit the typical prolonged drop in food intake, meal size and body weight normally associated with NIC administration. High performance liquid chromatography analyses demonstrated that compared to control rats, 6-OHDA administration significantly reduced PFH norepinephrine and epinephrine levels, but not dopamine levels. These results are consistent with NIC reducing food intake in part by acting through catecholaminergic neurons within or extending through the PFH.
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发表时间: 1983
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发表时间: 1996
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