机构地区:[1]青岛大学医学院病理生理学教研室 济宁医学院机能学实验室,青岛266021 [2]青岛市立医院 [3]青岛科技大学
出 处:《中华行为医学与脑科学杂志》2014年第8期715-719,共5页Chinese Journal of Behavioral Medicine and Brain Science
基 金:国家自然科学基金项目(31071014,81100260,81270460,81300281);青岛市科技局项目(13-1-4-170-jch,14-2-3-3-nsh)
摘 要:目的 观察nesfatin-1对大鼠饮水的影响,探讨Nesfatin-1对下丘脑调节水和电解质平衡的作用机制.方法 采用侧脑室埋管、注射药物和分子生物学等方法,观察内外源性Nesfatin-1对药物致渴、生理性致渴大鼠饮水的影响,并观察禁水对大鼠NUCB2/nesfatin-1基因表达的影响.结果 侧脑室注射外源性150、450 pmol nesfatin-1,大鼠0~ 120 min内各时间段的饮水量显著减少[150 pmol:(1.3±0.2)~(1.85±0.3) ml/100g;450 pmol:(0.8±0.4)~ (1.2±0.4) ml/100g vs NS:(2.5±0.3)~(3.1 ±0.2) ml/100g],且呈显著剂量依赖关系(P<0.05~ 0.01),但2~24 h饮水量无显著改变(P>0.05).侧脑室注射nesfatin-1,10 min后注射致渴剂血管紧张素Ⅱ,注射150 pmol nesfatin-1的大鼠在15~30 min饮水量显著减少[150 pmol:(2.17±0.6) ml/100g vs NS(3.62± 1.0) ml/100g,P<0.05],注射450 pmol nesfatin-1大鼠在注药后120 min内各时间段的饮水量均显著减少[450 pmol(0.31±0.1)~(2.87±0.8) ml/100g vs NS(2.31±0.7)~(7.05±0.2) ml/100g],呈剂量依赖关系(P<0.05~0.01),但5~24 h饮水量无显著改变(P>0.05).皮下注射高渗盐水,大鼠饮水量急剧增多,侧脑室注射150或450 pmol nesfatin-1,大鼠60 min内各时间段的饮水量均显著减少[150pmo1(0.25±0.2)~(1.6±0.25) ml/100g;450 pmol(0.1±0.15)~(1.92±0.2) ml/100g vs NS(0.9±0.2)~(2.9±0.2) ml/100g,P<0.05~0.01],但恢复供水后60~120 min或2~24 h的饮水量无显著差异(P>0.05).下丘脑PVN注射反义nesfatin-1 RNA,第2次注射后3h,侧脑室注射血管紧张素Ⅱ (50 pmol/2μl),大鼠饮水量显著增加[反义nesfatin-1:(1.87±0.4)~ (2.77±0.6) ml/100g vs NS(0.72±0.1)~(1.17±0.4) ml/100g,P<0.01],但大鼠体质量和摄食量差异无统计学意义(P>0.05).大鼠禁水18h,下丘脑内NUCB2基因表达显著降低[禁水组:(-7.2±1.1)%vs自由饮水组:(0.82±0.4)Objective To explore the effect of nesfatin-1 on water intake and the mechanism of nesfatin-1 in regulating water and electrolyte balance in hypothalamus of rats.Methods Lateral ventricle implantation tube,drugs and molecular biology were used to observe the effects of exogenous and endogenous nesfatin-1 on water intake in drug causing thirsty rats and on physiological thirsty rats.Meanwhile the gene expression of NUCB2/Nesfatin-1 of water ban rats has been observed.Results Lateral ventricle injection of 150,450 pmol exogenous nesfatin-1,the water intake in 0-120 min of rats significantly reduced (150 pmol(1.3±0.2)-(1.85±0.3) ml/100g;450 pmol(0.8±0.4)-(1.2±0.4) ml/100g vs NS(2.5±0.3)-(3.1±0.2)ml/100g) and showed a significant dose-response relationship (P<0.05-0.01),but the water intake in 2-24 h had no significant change (P>0.05).Angiotensin Ⅱ were administrated to lateral ventricle 10 min after injection of nesfatin-1.After injection of 150 pmol nesfatin-1,water intake in 15-30 min of rats significantly reduced (150 pmol(2.17±0.6) ml/100g vs NS(3.62 ± 1.0)ml/100g,P<0.05).After injection of 450 pmol nesfatin-1,water intake in each time period within 120 rain of rats reduced significantly (450pmol (0.31 ± 0.1)-(2.87 ± 0.8) ml/100g vs NS (2.31 ± 0.7)-(7.05 ± 0.2) ml/100g) and presented a dose-response manner (P<0.05-0.01),but 5-24 h water intake had no significant change (P>0.05).Subcutaneous injection of hypertonic saline,and water intake in rats increase rapidly(The water intake of rats with subcutaneous injection of hypertonic saline increase rapidly,while the water intake of rats with 150 pmol nesfatin-1 injection in lateral ventricle within 15~ 30 min and the water intake of rats with 450 pmol nesfatin-1 injection in lateral ventricle within 120 min significantly reduced.Lateral ventricle injection of 150 or 450 pmol nesfatin-1,water intake of each time period within 60 min in rats significantly reduced (
关 键 词:NESFATIN-1 饮水行为 血管紧张素Ⅱ 大鼠
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