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61.
Gordon ME McKeever KH Betros CL Manso Filho HC 《Veterinary journal (London, England : 1997)》2007,173(3):532-540
Six Standardbred (STB) mares (11+/-2 years, 521+/-77 kg; means+/-SD) performed an exercise trial (EX) where they underwent an incremental exercise test (GXT) as well as a parallel control trial (CON) to test the hypothesis that short-term, high intensity exercise would alter plasma concentrations of glucose, leptin, adiponectin, ghrelin, insulin and cortisol. Plasma samples were taken before (0 min), during (last 10s at 6, 8m/s, and the velocity eliciting VO(2max)), and after exercise (2, 10, 30, 60 min; 12 and 24h post-GXT). A second set of blood samples was collected before and after an afternoon meal given at 1515 h (at 1500, 1514, 1530, and 1545 h). Data were analyzed using ANOVA for repeated measures and Tukey's test. During the GXT, there were no changes (P>0.05) in the plasma concentrations of glucose, leptin, adiponectin or ghrelin. However, there was a 29% increase (P<0.05) in mean plasma cortisol concentration and a 35% decrease (P<0.05) in mean plasma insulin concentration. Substantial increases (P<0.05) in the mean plasma concentrations of glucose and cortisol of 36% and 102%, respectively, were seen in the EX trial during the first 60 min post-GXT. Plasma leptin concentration, measured at the 24h post-GXT time point, was 20% lower (P<0.05) during the EX trial compared with the parallel time point in the standing control (CON) trial. Plasma ghrelin concentration was 37% lower (P<0.05) in the EX trial compared with CON before and after the afternoon meal, but was 43% higher (P<0.05) 12h post-GXT. There were no differences between EX and CON for plasma concentrations of insulin or adiponectin during recovery. It was concluded that short-term high intensity exercise alters plasma leptin and ghrelin concentrations in STB mares post-exercise, which may signal the exercised animals to alter energy intake. 相似文献
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Ghrelin has been implicated in the control of food intake and in the long-term regulation of body weight. We theorize that preventing the ability of ghrelin to interact with its receptors, would eventually lead to decreased appetite and thereby decrease body weight gain. To test our hypothesis, pigs were actively immunized against ghrelin. Ghrelin((1-10)) was conjugated to BSA and emulsified in Freund's incomplete adjuvant and diethylaminoethyl-dextran. Primary immunization was given at 19 weeks of age (WOA), with booster immunizations given 20 and 40 days after primary immunization. Body weight (BW) and plasma samples were collected weekly beginning at 19 WOA, and feed intake was measured daily. Fourteen days after primary immunization, the percentage of bound (125)I-ghrelin in plasma from immunized pigs was increased compared with control animals (P<0.001). Voluntary feed intake was decreased more than 15% in animals that were actively immunized against ghrelin compared with controls. By the end of the experiment, immunized pigs weighed 10% less than control animals (P<0.1). Concentrations of GH were increased (P<0.05) in immunized pigs. Apoptosis was not observed in post-mortem samples obtained from the fundic region of the stomach. Our observations suggest that immunization against ghrelin induces mild anorexia. This procedure could potentially be used as a treatment to control caloric intake and obesity. 相似文献
63.
胃饥饿素(Ghrelin)是一种由28个氨基酸组成的多肽,具有促进生长激素释放、调控动物采食和能量代谢等作用.文章从Ghrelin的转录、修饰和体内循环过程出发,并对一些营养物质和激素对Ghrelin分泌的影响与调控机制进行综述,旨在为进一步研究调控Ghrelin分泌的机制提供理论参考,也为阐明动物的促生长机制提供理论... 相似文献
64.
鸡Ghrelin基因C2100T位点与生长和脂肪性状的相关性 总被引：2，自引：0，他引：2
选取鸡Ghrelin基因C2100T多态位点,利用PCR-RFLP结合测序技术,对全同胞资源家系470只F2代家鸡进行基因型检测及标记-性状关联分析,并利用已有的mRNA测定数据分析该多态位点与Ghrelin基因mRNA表达量的关系.结果:(1)经PCR-RFLP检测出3种基因型,测序结果证实C2100T是形成酶切多态性的原因;(2)QTDT检验显示,C2100T与鸡1、6、9周龄体重和皮下脂肪厚度显著相关(P＜0.05),并且不同基因型个体性状平均值大小关系为CC＞CT＞TT;C2100T与其他生长性状和脂肪性状均没有显著相关性;(3)不同基因型个体腺胃中的Ghrelin基因mRNA表达量差异不显著,但含C等位基因个体的mRNA表达量相对T等位基因高.试验结果表明,鸡Ghrelin基因C2100T多态性与鸡的部分生长和脂肪性状存在显著相关性,且C等位基因有利于鸡的体重增长和皮下脂肪沉积. 相似文献
65.
研究生长素(Ghrelin)在青春期、妊娠期、哺乳期和泌乳后期小鼠卵巢上的定位,采用免疫组化PV-9000二步法观察Ghrelin在卵巢上的分布。Ghrelin阳性细胞主要分布于4个生理时期小鼠卵巢的卵母细胞、间质细胞、髓质和黄体细胞上。但表达强度和分布范围不同,妊娠期8d黄体与哺乳期18d的卵巢髓质呈强阳性表达。妊娠8d的小鼠卵巢的生殖上皮细胞出现阳性表达。Ghrelin在小鼠卵巢青春期、妊娠期、哺乳期和泌乳后期时期均有表达,妊娠期黄体呈强表达,揭示Ghrelin可能对小鼠不同生理时期尤其是妊娠有一定的调节作用。 相似文献
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67.
The aim of the present study was to investigate the effect of cysteamine on growth performance of preweaning piglets and gastric expression of ghrelin mRNA in vivo and in vitro. Twelve litters of newborn piglets were allocated randomly to control and treatment groups. From 15 d of age, piglets in the control group were fed basal creep diet, whereas the treatment group received basal diet supplemented with 120 mg cysteamine per kg of diet until weaning on 35 d of age. Body weight gain, creep feed consumption, and diarrhea rates were recorded, and gastric mucosal tissues were collected for quantifying mRNA expression. To evaluate the direct effect of cysteamine on gastric ghrelin expression, primary cultures of gastric mucosal cells isolated from 35-d-old piglets were exposed to cysteamine for 20 h at 0, 1, 10, and 100 μg/mL, respectively. Dietary cysteamine increased (P < 0.05) average daily creep feed consumption and BW gain in preweaning pigs, which was accompanied by reduction in diarrhea rates. At 35 d of age, piglets treated with cysteamine showed increased (P < 0.05) ghrelin and gastrin and decreased (P < 0.05) somatostatin mRNA expression in gastric mucosa. Moreover, dietary cysteamine treatment increased serum concentration of gastrin (P < 0.05). In vitro, cysteamine significantly increased ghrelin mRNA expression in gastric mucosal cells at the concentration of 10 μg/mL. In conclusion, dietary cysteamine is effective in improving the growth performance and health condition of preweaning piglets, which is associated with its stimulatory effects on gastric ghrelin mRNA expression both in vivo and in vitro. 相似文献
68.
6周龄BALB/c雌性小鼠80只,分为4组：雌激素＋Ghrelin组、雌激素＋生理盐水组、生理盐水组、空白对照组。雌激素＋Ghrelin组首先隔日腹腔注射苯甲酸雌二醇（0.1mg/只）2周,然后采用相同方法注射Ghrelin（120μg/只）2周;雌激素＋生理盐水组首先注射苯甲酸雌二醇2周,然后注射生理盐水2周;生理盐水组注射生理盐水4周;空白对照组不注射任何试剂。测量各组小鼠的胸腺指数,同时应用光镜、电镜和流式细胞术检测胸腺的显微结构、超微结构和胸腺细胞凋亡率。结果雌激素＋Ghrelin组的胸腺指数极显著大于雌激素＋生理盐水组,胸腺细胞凋亡率极显著小于雌激素＋生理盐水组（P〈0.01）,而二者与生理盐水组和空白对照组均差异不显著（P〉0.05）;雌激素＋Ghrelin组的胸腺显微结构和超微结构基本恢复正常,并与生理盐水组和空白对照组相似。结论得出Ghrelin可以通过抑制胸腺细胞凋亡和促进胸腺细胞增殖,从而逆转雌激素诱导的小鼠胸腺萎缩。 相似文献
69.
本试验应用免疫组织化学方法和显微图像分析技术,探讨了Ghrelin在1、3、5、6、12月龄BALB/c小鼠胸腺中的定位分布和发育性表达规律。结果表明,Ghrelin免疫阳性反应主要分布于胸腺髓质内,而胸腺皮质中较少。Ghrelin阳性细胞类型包括被膜下胸腺上皮细胞、星形胸腺上皮细胞、髓质胸腺上皮细胞、胸腺小体上皮细胞、巨噬细胞、胸腺髓质的部分淋巴细胞,可能还有胸腺树突状细胞。Ghrelin在小鼠胸腺中的表达量,1、3月龄之间差异不显著(P0.05),5、6月龄之间差异也不显著(P0.05),但5、6月龄显著低于1、3月龄(P0.05),而12月龄又显著低于5、6月龄(P0.05)和极显著低于1、3月龄(P0.01),即随着年龄的增长,胸腺中的Ghrelin表达量逐渐减少。结果提示,胸腺的年龄性退化可能与Ghrelin的表达量下降有关。 相似文献
70.
YANG Jian-hong SU Wei LI Liang LIU Jian-jun SHEN Xin-hua QIAN Min-cai SONG Juan-fang 《园艺学报》2013,29(10):1845-1849
AIM: To observe the changes of metabolic indicators in the treatment of first-episode schizophrenia with olanzapine or aripiprazole. METHODS: A total of 99 cases of first-episode schizophrenia inpatients randomly received olanzapine or aripiprazole treatment. Body mass index (BMI) and serum levels of leptin and ghrelin were measured before treatment and at the end of the 4th, 8th and 24th weeks during treatment. The status of the patients and the therapeutic efficacy were assessed using the Positive and Negative Syndrome Scale (PANSS). RESULTS: Serum leptin level in these schizophrenia patients was elevated after treatment with olanzapine or aripiprazole, and was positively correlated with BMI. This change appeared at the early stage of treatment (the end of the 4th week), and continued to the end of the 24th week. The relationship between serum ghrelin level and BMI after treatment was only observed in aripiprazole group (r=−0.291, P<0.05). CONCLUSION: Serum leptin in first-episode schizophrenia patients after olanzapine or aripiprazole treatment remains at a high level. The correlation between BMI and serum leptin level is more significant in olanzapine group, while more significant correlation between BMI and serum ghrelin level is observed in aripiprazole group. The effect of aripiprazole on BMI may be achieved through the action of ghrelin. 相似文献