本文主要研究内容
作者夏琴(2019)在《基于脂联素信号通路研究白藜芦醇调控猪肉品质和骨骼肌肌纤维类型转化的作用机制》一文中研究指出:猪肉品质及其调控是动物营养研究领域的热点。肌纤维类型是构成不同品种间肉质差异的关键因素之一。本论文旨在通过饲养试验研究日粮中添加白藜芦醇(Resveratrol,RES)对生长肥育猪肉质性状指标、背最长肌肌纤维类型以及脂联素(AdipoQ)信号通路关键基因表达的影响,并在细胞水平上探讨RES通过AdipoQ信号通路调控猪骨骼肌肌纤维类型转化的机制,为开发RES作为一种通过调控肌纤维类型进而改善猪肉品质的饲料添加剂提供科学理论依据。主要研究结果如下1、日粮中添加RES对生长肥育猪生长性能、胴体性状和肉质指标的影响本试验选用24头65kg左右的杜×长×大三元杂交猪作为试验动物,设四个处理组:对照组(饲喂基础日粮)、200mg/kg组(饲喂基础日粮+200mg/kg RES)、400mg/kg组(饲喂基础日粮+400mg/kg RES)、600mg/kg组(饲喂基础日粮+600mg/kg RES),每组6头猪,在猪体重到110kg时屠宰取样。结果表明:(1)与对照组相比,日粮中添加RES对生长肥育期杜长大猪的生长性能、胴体性状以及血液指标方面没有显著性影响。(2)在肉质方面,三个试验组的肉色评分均显著上升;400mg/kg和600mg/kg组的肌肉电导率以及剪切力指标均显著低于对照组和200mg/kg组;400mg/kg和600mg/kg组的肌内脂肪含量显著高于对照组和200mg/kg组。由此可见,日粮中添加适量的RES能够明显改善猪背最长肌的颜色,降低肌肉剪切力和电导率,提高肌内脂肪含量,这说明RES具有改善猪肉品质的作用。其中,400mg/kg和600mg/kg添加量能达到改善肉质的最佳效果。2、日粮中添加RES对猪骨骼肌肌纤维类型转化调控作用的研究本试验采用上述饲养试验猪的背最长肌组织样品进行检测,旨在探讨日粮中添加RES对肥育猪背最长肌肌纤维类型、能量代谢酶活的影响,以及RES是否通过AdipoQ信号通路调控骨骼肌肌纤维类型转化的作用机制。结果表明:(1)400mg/kg和600mg/kg组的MyHCl基因表达量极显著高于对照组和200mg/kg组;200mg/kg组MyHC2a基因表达量显著高于对照组,400mg/kg和600mg/kg组极显著高于对照组;与对照组相比,200mg/kg和600mg/kg组MyHC2b的mRNA表达量显著降低,400mg/kg组极显著降低。(2)与肌纤维类型相关的能量代谢酶活(苹果酸脱氢酶MDH、乳酸脱氢酶LDH和琥珀酸脱氢酶SDH)方面:与对照组相比,200mg/kg组的MDH酶活无明显变化,400mg/kg和600mg/kg组极显著升高;对照组和200mg/kg组之间的SDH酶活无显著差异,400mg/kg和600mg/kg组的SDH酶活均极显著高于对照组和200mg/kg组;与对照组相比,日粮中添加RES能够显著降低背最长肌LDH的活性。由此可见,日粮中添加适量的RES能够调控猪骨骼肌肌纤维类型从酵解型向氧化型转化,其中,400mg/kg和600mg/kg组能达到最佳效果。(3)AdipoQ信号通路关键基因表达的检测方面,400mg/kg和600mg/kg组猪的背最长肌中AdipoQ、AdipoR1、AdipoR2、AMPKα1、SIRT1基因的表达量均极显著高于对照组和200mg/kg组;与对照组相比,RES组背最长肌中AMPKα2的mRNA表达量极显著升高,且400mg/kg组的表达量极显著高于200mg/kg和600mg/kg组;400mg/kg和600mg/kg组PGC-11α基因的表达量极显著高于对照组和200mg/kg组,200mg/kg组显著高于对照组,400mg/kg和600mg/kg组无显著差异。同时,检测关键蛋白的表达量发现:试验组的蛋白表达量都高于对照组,其中AdipoQ蛋白表达量是随着RES添加量的增加而升高,400mg/kg组和600mg/kg组的AdipoR1、AMPKα、PGC-1α的蛋白表达量均显著高于对照组,与上述荧光定量结果一致。由此可看出,RES能够上调AdipoQ信号通路上关键基因的表达,其中,400mg/kg和600mg/kg组调控效果最为明显。3、细胞水平研究RES通过AdipoQ信号通路调控肌纤维类型基因表达的作用机制(1)利用pLV-AdipoQ重组慢病毒质粒转染猪骨骼肌卫星细胞,结果显示,过表达AdipoQ基因后,AdipoR1、AdipoR2、AMPKα1、AMPKα2、PGC-1α、SIRT1基因的表达均显著上升。(2)用AdipoR1-shRNA慢病毒感染猪骨骼肌卫星细胞,结果显示,干扰AdipoR1基因后,AdipoR1、AMPKα1、AMPKα2、PGC-1α、SIRT1均具有下降趋势,AdipoQ、AdipoR2无明显变化。以上结果说明,AdipoQ是与其受体1结合,调控下游基因AMPKα1、AMPKα2、SIRT1、PGC-1α的表达。(3)RES干预猪骨骼肌卫星细胞并诱导分化的试验结果显示,RES干预后,AdipoR1、AdipoR2、AMPKα1、AMPKα2、PGC-1α、SIRT1、MyHC1、MyHC2α 基因的表达水平均显著上升,MyHC2b基因表达水平显著下降。由此说明,RES具有通过上调AdipoQ信号通路调控肌纤维类型从酵解型向氧化型转化的作用。综合体内和体外实验结果表明,RES激活AdipoQ-AdipoR1-AMPK-SIRT1-PGC-1α信号通路,调控猪骨骼肌肌纤维类型从酵解型向氧化型转变,达到改善猪肉品质的作用。在杜长大猪肥育期65kg-110kg体重阶段,综合考虑改善猪肉品质的最佳效果及最低饲养成本,日粮中RES的适宜添加量为400mg/kg。
Abstract
zhu rou pin zhi ji ji diao kong shi dong wu ying yang yan jiu ling yu de re dian 。ji qian wei lei xing shi gou cheng bu tong pin chong jian rou zhi cha yi de guan jian yin su zhi yi 。ben lun wen zhi zai tong guo si yang shi yan yan jiu ri liang zhong tian jia bai li lu chun (Resveratrol,RES)dui sheng chang fei yo zhu rou zhi xing zhuang zhi biao 、bei zui chang ji ji qian wei lei xing yi ji zhi lian su (AdipoQ)xin hao tong lu guan jian ji yin biao da de ying xiang ,bing zai xi bao shui ping shang tan tao REStong guo AdipoQxin hao tong lu diao kong zhu gu ge ji ji qian wei lei xing zhuai hua de ji zhi ,wei kai fa RESzuo wei yi chong tong guo diao kong ji qian wei lei xing jin er gai shan zhu rou pin zhi de si liao tian jia ji di gong ke xue li lun yi ju 。zhu yao yan jiu jie guo ru xia 1、ri liang zhong tian jia RESdui sheng chang fei yo zhu sheng chang xing neng 、dong ti xing zhuang he rou zhi zhi biao de ying xiang ben shi yan shua yong 24tou 65kgzuo you de du ×chang ×da san yuan za jiao zhu zuo wei shi yan dong wu ,she si ge chu li zu :dui zhao zu (si wei ji chu ri liang )、200mg/kgzu (si wei ji chu ri liang +200mg/kg RES)、400mg/kgzu (si wei ji chu ri liang +400mg/kg RES)、600mg/kgzu (si wei ji chu ri liang +600mg/kg RES),mei zu 6tou zhu ,zai zhu ti chong dao 110kgshi tu zai qu yang 。jie guo biao ming :(1)yu dui zhao zu xiang bi ,ri liang zhong tian jia RESdui sheng chang fei yo ji du chang da zhu de sheng chang xing neng 、dong ti xing zhuang yi ji xie ye zhi biao fang mian mei you xian zhe xing ying xiang 。(2)zai rou zhi fang mian ,san ge shi yan zu de rou se ping fen jun xian zhe shang sheng ;400mg/kghe 600mg/kgzu de ji rou dian dao lv yi ji jian qie li zhi biao jun xian zhe di yu dui zhao zu he 200mg/kgzu ;400mg/kghe 600mg/kgzu de ji nei zhi fang han liang xian zhe gao yu dui zhao zu he 200mg/kgzu 。you ci ke jian ,ri liang zhong tian jia kuo liang de RESneng gou ming xian gai shan zhu bei zui chang ji de yan se ,jiang di ji rou jian qie li he dian dao lv ,di gao ji nei zhi fang han liang ,zhe shui ming RESju you gai shan zhu rou pin zhi de zuo yong 。ji zhong ,400mg/kghe 600mg/kgtian jia liang neng da dao gai shan rou zhi de zui jia xiao guo 。2、ri liang zhong tian jia RESdui zhu gu ge ji ji qian wei lei xing zhuai hua diao kong zuo yong de yan jiu ben shi yan cai yong shang shu si yang shi yan zhu de bei zui chang ji zu zhi yang pin jin hang jian ce ,zhi zai tan tao ri liang zhong tian jia RESdui fei yo zhu bei zui chang ji ji qian wei lei xing 、neng liang dai xie mei huo de ying xiang ,yi ji RESshi fou tong guo AdipoQxin hao tong lu diao kong gu ge ji ji qian wei lei xing zhuai hua de zuo yong ji zhi 。jie guo biao ming :(1)400mg/kghe 600mg/kgzu de MyHClji yin biao da liang ji xian zhe gao yu dui zhao zu he 200mg/kgzu ;200mg/kgzu MyHC2aji yin biao da liang xian zhe gao yu dui zhao zu ,400mg/kghe 600mg/kgzu ji xian zhe gao yu dui zhao zu ;yu dui zhao zu xiang bi ,200mg/kghe 600mg/kgzu MyHC2bde mRNAbiao da liang xian zhe jiang di ,400mg/kgzu ji xian zhe jiang di 。(2)yu ji qian wei lei xing xiang guan de neng liang dai xie mei huo (ping guo suan tuo qing mei MDH、ru suan tuo qing mei LDHhe hu po suan tuo qing mei SDH)fang mian :yu dui zhao zu xiang bi ,200mg/kgzu de MDHmei huo mo ming xian bian hua ,400mg/kghe 600mg/kgzu ji xian zhe sheng gao ;dui zhao zu he 200mg/kgzu zhi jian de SDHmei huo mo xian zhe cha yi ,400mg/kghe 600mg/kgzu de SDHmei huo jun ji xian zhe gao yu dui zhao zu he 200mg/kgzu ;yu dui zhao zu xiang bi ,ri liang zhong tian jia RESneng gou xian zhe jiang di bei zui chang ji LDHde huo xing 。you ci ke jian ,ri liang zhong tian jia kuo liang de RESneng gou diao kong zhu gu ge ji ji qian wei lei xing cong jiao jie xing xiang yang hua xing zhuai hua ,ji zhong ,400mg/kghe 600mg/kgzu neng da dao zui jia xiao guo 。(3)AdipoQxin hao tong lu guan jian ji yin biao da de jian ce fang mian ,400mg/kghe 600mg/kgzu zhu de bei zui chang ji zhong AdipoQ、AdipoR1、AdipoR2、AMPKα1、SIRT1ji yin de biao da liang jun ji xian zhe gao yu dui zhao zu he 200mg/kgzu ;yu dui zhao zu xiang bi ,RESzu bei zui chang ji zhong AMPKα2de mRNAbiao da liang ji xian zhe sheng gao ,ju 400mg/kgzu de biao da liang ji xian zhe gao yu 200mg/kghe 600mg/kgzu ;400mg/kghe 600mg/kgzu PGC-11αji yin de biao da liang ji xian zhe gao yu dui zhao zu he 200mg/kgzu ,200mg/kgzu xian zhe gao yu dui zhao zu ,400mg/kghe 600mg/kgzu mo xian zhe cha yi 。tong shi ,jian ce guan jian dan bai de biao da liang fa xian :shi yan zu de dan bai biao da liang dou gao yu dui zhao zu ,ji zhong AdipoQdan bai biao da liang shi sui zhao REStian jia liang de zeng jia er sheng gao ,400mg/kgzu he 600mg/kgzu de AdipoR1、AMPKα、PGC-1αde dan bai biao da liang jun xian zhe gao yu dui zhao zu ,yu shang shu ying guang ding liang jie guo yi zhi 。you ci ke kan chu ,RESneng gou shang diao AdipoQxin hao tong lu shang guan jian ji yin de biao da ,ji zhong ,400mg/kghe 600mg/kgzu diao kong xiao guo zui wei ming xian 。3、xi bao shui ping yan jiu REStong guo AdipoQxin hao tong lu diao kong ji qian wei lei xing ji yin biao da de zuo yong ji zhi (1)li yong pLV-AdipoQchong zu man bing du zhi li zhuai ran zhu gu ge ji wei xing xi bao ,jie guo xian shi ,guo biao da AdipoQji yin hou ,AdipoR1、AdipoR2、AMPKα1、AMPKα2、PGC-1α、SIRT1ji yin de biao da jun xian zhe shang sheng 。(2)yong AdipoR1-shRNAman bing du gan ran zhu gu ge ji wei xing xi bao ,jie guo xian shi ,gan rao AdipoR1ji yin hou ,AdipoR1、AMPKα1、AMPKα2、PGC-1α、SIRT1jun ju you xia jiang qu shi ,AdipoQ、AdipoR2mo ming xian bian hua 。yi shang jie guo shui ming ,AdipoQshi yu ji shou ti 1jie ge ,diao kong xia you ji yin AMPKα1、AMPKα2、SIRT1、PGC-1αde biao da 。(3)RESgan yu zhu gu ge ji wei xing xi bao bing you dao fen hua de shi yan jie guo xian shi ,RESgan yu hou ,AdipoR1、AdipoR2、AMPKα1、AMPKα2、PGC-1α、SIRT1、MyHC1、MyHC2α ji yin de biao da shui ping jun xian zhe shang sheng ,MyHC2bji yin biao da shui ping xian zhe xia jiang 。you ci shui ming ,RESju you tong guo shang diao AdipoQxin hao tong lu diao kong ji qian wei lei xing cong jiao jie xing xiang yang hua xing zhuai hua de zuo yong 。zeng ge ti nei he ti wai shi yan jie guo biao ming ,RESji huo AdipoQ-AdipoR1-AMPK-SIRT1-PGC-1αxin hao tong lu ,diao kong zhu gu ge ji ji qian wei lei xing cong jiao jie xing xiang yang hua xing zhuai bian ,da dao gai shan zhu rou pin zhi de zuo yong 。zai du chang da zhu fei yo ji 65kg-110kgti chong jie duan ,zeng ge kao lv gai shan zhu rou pin zhi de zui jia xiao guo ji zui di si yang cheng ben ,ri liang zhong RESde kuo yi tian jia liang wei 400mg/kg。
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论文详细介绍
论文作者分别是来自广西大学的夏琴,发表于刊物广西大学2019-10-14论文,是一篇关于白藜芦醇论文,脂联素信号通路论文,猪肉品质论文,肌纤维类型论文,广西大学2019-10-14论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自广西大学2019-10-14论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:白藜芦醇论文; 脂联素信号通路论文; 猪肉品质论文; 肌纤维类型论文; 广西大学2019-10-14论文;