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目的研究母鼠暴露于大豆异黄酮对新生儿期大鼠子宫发育及雌激素受体表达的影响。方法将母鼠及其仔鼠随机分至6组,母鼠的大豆异黄酮暴露剂量分别为0、10、50、100、150、200mg/kgBW(i.g.),暴露时间为产后第5至10天(PND5~10)。在PND11处死雌性仔鼠,称量子宫重量并进行病理学检查,利用ELISA方法测定血清雌二醇(E2)和孕酮(P)浓度,利用RT-PCR方法测定子宫中雌激素受体(ER)mRNA的表达。结果与对照组比较,大豆异黄酮150、200mg/kgBW剂量组仔鼠的子宫/体重比显著增加,子宫内膜增厚的差异有统计学意义(P〈0.05);血清E2浓度明显高于对照组,SIF150组升高幅度最大,但各处理组血清P浓度呈下降趋势;100、150、200mg/kgBW剂量组仔鼠的子宫ERmRNA表达降低的差异有统计学意义(P〈0.05)。结论大豆异黄酮经母鼠暴露,可刺激雌性仔鼠的子宫发育,这种雌激素样效应至少与该物质对血液性激素和子宫ERmRNA表达的调节作用有关。 相似文献
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大豆异黄酮和牛初乳复合制剂对去卵巢大鼠骨密度及子宫组织抗氧化作用的研究 总被引:7,自引:0,他引:7
目的:探讨大豆异黄酮和牛初乳制剂(复合制剂)对去卵巢大鼠骨密度及子宫超氧化物歧化酶(SOD)活性、丙二醛(MDA)和谷胱甘肽(GSH)含量的影响。方法:大鼠去卵巢建立骨质疏松症模型,连续灌胃给予复合制剂三个月,测定胫骨骨密度及骨钙、磷、锌含量,测定子宫MDA、GSH含量、子宫SOD活性。梯度胶电泳分离子宫SOD同工酶,分析SOD谱带活性。结果:大鼠建模后,骨密度及骨钙、磷、锌含量均低于正常对照组,给予复合制剂后,各剂量组骨密度和骨钙、磷、锌含量均升高,其中高、中剂量组的骨重、骨密度、骨矿盐密度和中剂量组的骨钙密度与模型相比,差异有显著性;中、低剂量组的骨钙、磷和低剂量组的骨锌,显著高于模型组。去卵巢大鼠子宫MDA含量明显升高,GSH含量显著下降,给予复合制剂后,中剂量组MDA含量下降明显,GSH含量增加,与模型组比差异有显著性。模型组子宫SOD活性显著低于对照组,给予复合制剂后能显著提高中剂量组子宫SOD比活性、Mn-SOD活性和高剂量组SOD比活性。大鼠子宫有三种SOD同工酶,去卵巢后同工酶活性都受到了明显抑制,给予复合制剂后,中、低剂量组的SOD同工酶活性恢复明显。复合制剂含有类SOD活性为3492U/g。结论:复合制剂能增加去卵巢大鼠骨密度,抑制骨量丢失,提高子宫组织抗氧化损伤能力,对骨质疏松症有较好的改善作用。 相似文献
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大豆异黄酮和双酚A联合暴露对雌性大鼠不同组织雌激素受体表达的影响 总被引:1,自引:0,他引:1
目的研究大豆异黄酮和双酚A哺乳期联合暴露对SD雌性大鼠的子宫增生效应及其对下丘脑-垂体-卵巢轴雌激素受体(ERα和ERβ)表达的影响。方法将母鼠及其仔鼠随机分至4组,即阴性对照组、大豆异黄酮组(每公斤体重150mg,i.g.)、双酚A组(每公斤体重150mg,i.g.)、联合暴露组(每公斤体重150mg大豆异黄酮 每公斤体重150mg双酚A,i.g.)。母鼠在产后第5至11天给予受试物,仔鼠在出生后5至11d(PND5-PND11)通过母乳暴露受试物。在PND12处死部分雌性仔鼠。剩余雌性仔鼠观察阴门开口时间和动情周期,并于PND70处死。剥离子宫并称重,病理学检查;利用Westernblot方法测定下丘脑、垂体、卵巢和子宫的ERα和ERβ表达。结果与阴性对照组比较,PND12时,大豆异黄酮组和双酚A组大鼠子宫体重比显著增加(P<0.05),联合暴露组子宫体重比亦显著增加(P<0.05),但其幅度略低于大豆异黄酮组和双酚A组。PND70时,各组大鼠的子宫体重比差异无统计学意义(P>0.05)。大豆异黄酮组、双酚A组和联合暴露组的阴门开口时间和动情周期与对照组比较差异无统计学意义(P>0.05)。在PND12和PND70时,大豆异黄酮组、双酚A组和联合暴露组大鼠下丘脑、垂体、卵巢和子宫的ERα和ERβ表达有部分增强或减弱。结论哺乳期大鼠大豆异黄酮和双酚A联合暴露时,可促进雌性仔鼠的子宫发育,但两者并未表现出协同作用;这种子宫增生效应在生命后期消失。大豆异黄酮和双酚A的子宫效应可能与对下丘脑-垂体-卵巢轴和子宫组织中ERα和ERβ表达的调节有关。 相似文献
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目的:研究早期给予槲皮素对母鼠生殖及其子代发育的影响。方法:孕鼠随机分为4组:空白对照组、槲皮素低、中、高剂量组(从孕0d至断乳21d灌胃给予槲皮素,剂量分别为16、160、480mg/(kg.d))。定期检测母鼠和仔鼠的生长指标、繁殖能力、幼仔存活及幼仔肛殖距(AGD),产后第21天处死母鼠和仔鼠,计算母鼠和幼仔脏器指数。结果:与空白对照组相比,槲皮素组对母鼠体质量、繁殖能力、幼仔存活率没有影响;槲皮素低、中剂量组中雄性仔鼠AGD和体质量显著降低;槲皮素组对雌性仔鼠AGD和体质量没有影响;槲皮素高剂量组降低母鼠和雄性仔鼠的脾脏指数,中剂量组增加雌性仔鼠肾脏指数。结论:槲皮素具有雌激素及抗雌激素作用,对雄性仔鼠影响较大,无生殖与发育毒性。 相似文献
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以荷斯坦奶牛为实验材料,通过体外培养奶牛乳腺上皮细胞,添加催乳素、雌激素和胰岛素运用激光扫描共聚焦显微技术、Western Blot Analysis、Real-Time PCR等技术来观察乳腺上皮细胞中瘦素表达和泌乳功能的变化规律。结果表明,应用Western Blotting方法对泌乳期奶牛乳腺上皮细胞中瘦素和瘦素受体的蛋白表达量进行研究,催乳素、雌激素能显著提高瘦素及其受体的分泌,且催乳素高于雌激素,胰岛素影响不显著。荧光定量RT-PCR结果表明,催乳素和雌激素能提高瘦素及其受体mRNA表达量,胰岛素没有明显影响。 相似文献
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近年来,因雌激素代谢紊乱引起的女性健康问题受到国内外学者的广泛关注。有研究发现肠道微生物及其多样性对女性雌激素代谢及其代谢产物有重要影响,而经过益生菌干预后可改善肠道菌群结构,促进有益菌生长,进而改善机体雌激素代谢。此外,益生菌能够调节有机体内血液循环及内分泌循环系统,从而改善因雌激素代谢紊乱而诱发的一系列疾病。本文对国内外益生菌与雌激素相关疾病的研究现状进行综述,并列举了益生菌对改善雌激素代谢紊乱在临床治疗中的应用,为雌激素代谢紊乱及相关疾病的防治提供一定参考。 相似文献
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中国北方人初乳、牛初乳、牛常乳、牛血中胰岛素样生长因子-1和神经生长因子含量的比较 总被引:1,自引:1,他引:0
王洋 《中国食品卫生杂志》2011,23(4)
目的检测人初乳、集中饲养的新西兰进口荷斯坦乳牛的初乳、常乳和血液中胰岛素样生长因子-1(IGF-1)和神经生长因子(NGF)的含量,比较人初乳和牛初乳、牛初乳和牛常乳以及牛乳和同期采集的血液中IGF-1、NGF的含量。方法采用放射免疫试剂盒测定人初乳、牛初乳、牛常乳和血中IGF-1、NGF的含量,使用SPSS 13.0进行统计分析。结果本研究中测定的人初乳中IGF-1的含量是26.91μg/L,荷斯坦乳牛的初乳、常乳和血清中IGF-1的含量分别是38.40、20.14和37.35μg/L。人初乳中NGF的含量是300.47 ng/L,荷斯坦乳牛的初乳、常乳和血清中NGF的含量分别是69.82、110.37和9.63 ng/L。经统计学分析发现牛初乳和人初乳中IGF-1的含量差异没有显著性,牛初乳中IGF-1的含量高于牛常乳(P<0.05),牛乳中IGF-1的含量与同期血液中IGF-1的含量差异没有显著性。人初乳中NGF的含量高于牛初乳(P<0.05),牛初乳和牛常乳中NGF的含量差异没有显著性,同期牛血中NGF的含量低于牛乳中NGF的含量(P<0.05)。结论本研究发现牛初乳与人初乳IGF-1含量无明显差别,... 相似文献
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R. Tacoma S.L. Gelsinger Y.W. Lam R.A. Scuderi D.B. Ebenstein A.J. Heinrichs S.L. Greenwood 《Journal of dairy science》2017,100(11):9392-9401
Heat treatment of colostrum is performed on modern dairy farms to reduce pathogenic contamination before hand-feeding the colostrum to newborn calves; however, limited data are available concerning effects of heat treatment on biologically active proteins in colostrum. The objective of this exploratory study was to investigate effects of heat treatment and length of heat treatment on colostrum protein profile. Colostrum samples were collected from Holstein cows within 12 h after parturition and assigned to the following groups: heat treatment at 60°C for 0 (untreated control), 30, 60, or 90 min. Samples were fractionated using acid precipitation, followed by ultracentrifugation and ProteoMiner (Bio-Rad Laboratories, Hercules, CA) treatment, and tandem-mass tagging was used to comparatively assess the low abundance protein profile. A total of 162 proteins were identified with more than 2 peptides in the low abundance protein enriched fraction. Of these, 62 differed in abundance by more than 2-fold in heat-treated samples compared with the unheated control. The majority of proteins affected by heat treatment were involved in immunity, enzyme function, and transport-related processes; affected proteins included lactadherin, chitinase-3-like protein 1, and complement component C9. These results provide a foundation for further research to determine optimum heat treatment practices to ensure newborn calves are fed colostrum-containing proteins with the highest nutritional and biological value. 相似文献
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Colostrum composition and management were surveyed via sample and data collection from 55 dairy farms in Pennsylvania. Colostrum samples were analyzed for fat, protein, lactose, total solids, ash, Ig, lactoferrin, water- and fat-soluble vitamins, and minerals. Mean percentages of fat, protein, and lactose in colostrum were 6.7, 14.9, and 2.5, respectively. Concentrations of IgG1, IgG2, IgA, IgM, and lactoferrin were 35.0, 6.0, 1.7, 4.3, and 0.8 mg/mL, respectively. Mean concentrations of fat-soluble vitamins, including retinol, tocopherol, and β-carotene, were 4.9, 2.9, and 0.7 μg/g, respectively. Mean concentrations of water-soluble vitamins were 0.34, 0.90, 4.55, 0.60, 0.15, 0.21, and 0.04 μg/mL for niacin, thiamine, riboflavin, vitamin B12, pyridoxal, pyridoxamine, and pyridoxine, respectively. Mean concentrations (mg/kg) of selected minerals in colostrum were also determined (Ca 4,716; P 4,452; Mg 733; Na 1,058; K 2,845; Zn 38; Fe 5.3; Cu 0.3; S 2,595; and Mn 0.1). The findings of this study revealed that the mean concentrations of most nutrients in colostrum have increased when compared with values previously reported. Results also showed that management practices have improved over time, particularly with regard to colostrum storage and feeding. Additionally, we observed that herd size influenced colostrum management and quality. It can be inferred, based on these findings, that although improvements have been made with regard to colostrum management and quality, there is still a need to educate producers on issues related to storage and timely feeding of colostrum to increase passive transfer and decrease the rate of calf morbidity and mortality. 相似文献
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通过添加稳定剂提高牛初乳的热稳定性并将其加工成酸奶。牛初乳中按0.5 g/100g添加Na2HPO4,65℃加热,记录凝固时间及评价杀菌效果;确定葡萄糖和蔗糖的添加比例,将杀菌初乳制成酸奶,进行乳酸菌和杂菌计数。结果表明,添加Na2HPO4的牛初乳加热40 min才开始凝固,而未添加组加热6 min完全凝固。65℃加热15 min,牛初乳菌落总数和大肠菌群均合格;当葡萄糖添加量为3 g/100g,蔗糖添加量为4 g/100g时,牛初乳酸奶口感最佳,乳酸菌数为1.26×106 cfu/mL。因此按0.5 g/100g添加Na2HPO4可以显著提高牛初乳的热稳定性,加工制成的初乳酸奶兼具了牛初乳和酸乳的双重功效。 相似文献
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天然牛初乳含有丰富的营养及生物活性成分,有很强的营养保健功能。口服牛初乳具有调节肠道菌群、改善胃肠道功能、促进生长发育、增强智力等功能。作为功能性食品重要原料,牛初乳具有广阔的开发利用前景。 相似文献
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