目的观察用含不同浓度氟饮水喂养的SD大鼠所产的子鼠成釉细胞中基质金属蛋白酶-20(MMP-20)、激肽释放酶(KLK4)的表达变化,探讨氟牙症的发病机制。方法给母体SD大鼠分别饮用氟质量浓度为0、50、100mg/L的饮水,待母鼠自然分娩后,取其子鼠...目的观察用含不同浓度氟饮水喂养的SD大鼠所产的子鼠成釉细胞中基质金属蛋白酶-20(MMP-20)、激肽释放酶(KLK4)的表达变化,探讨氟牙症的发病机制。方法给母体SD大鼠分别饮用氟质量浓度为0、50、100mg/L的饮水,待母鼠自然分娩后,取其子鼠下颌骨制作切片并提取牙胚组织,分别用免疫组化和实时定量PCR方法检测不同染氟组大鼠成釉细胞中MMP-20及KLK4的蛋白及基因表达,应用Image-Pro Plus 6.0和GraphPad Prism 5软件对免疫组化和PCR数据结果进行分析。结果①随着饮水氟质量浓度的增加,成釉细胞中MMP-20蛋白及其mRNA的表达量逐渐减少;②KLK4蛋白和KLK4mRNA的表达量在两实验组呈现了类似的变化,但高氟组与低氟组间的差别不明显。结论氟可使成釉细胞减少对MMP-20及KLK4的分泌。这可能是釉基质蛋白降解延迟、釉质矿化异常,最终导致氟牙症产生的机制之一。展开更多
Background The aim of this study was to determine whether and how Zn proteinate with moderate chelation strength(Zn-Prot M)can alleviate heat stress(HS)-induced intestinal barrier function damage of broilers.A complet...Background The aim of this study was to determine whether and how Zn proteinate with moderate chelation strength(Zn-Prot M)can alleviate heat stress(HS)-induced intestinal barrier function damage of broilers.A completely randomized design was used for comparatively testing the effects of Zn proteinate on HS and non-HS broilers.Under high temperature(HT),a 1(Control,HT-CON)+2(Zn source)×2(added Zn level)factorial arrangement of treatments was used.The 2 added Zn sources were Zn-Prot M and Zn sulfate(ZnS),and the 2 added Zn levels were 30 and 60 mg/kg.Under normal temperature(NT),a CON group(NT-CON)and pair-fed group(NT-PF)were included.Results The results showed that HS significantly reduced mRNA and protein expression levels of claudin-1,occludin,junctional adhesion molecule-A(JAMA),zonula occludens-1(ZO-1)and zinc finger protein A20(A20)in the jejunum,and HS also remarkably increased serum fluorescein isothiocyanate dextran(FITC-D),endotoxin and interleukin(IL)-1βcontents,serum diamine oxidase(DAO)and matrix metalloproteinase(MMP)-2 activities,nuclear factor kappa-B(NF-κB)p65 mRNA expression level,and protein expression levels of NF-κB p65 and MMP-2 in the jejunum.However,dietary supplementation with Zn,especially organic Zn as Zn-Prot M at 60 mg/kg,significantly decreased serum FITC-D,endotoxin and IL-1βcontents,serum DAO and MMP-2 activities,NF-κB p65 mRNA expression level,and protein expression levels of NF-κB p65 and MMP-2 in the jejunum of HS broilers,and notably promoted mRNA and protein expression levels of claudin-1,ZO-1 and A20.Conclusions Our results suggest that dietary Zn,especially 60 mg Zn/kg as Zn-Prot M,can alleviate HS-induced intestinal barrier function damage by promoting the expression of TJ proteins possibly via induction of A20-mediated suppression of the NF-κB p65/MMP-2 pathway in the jejunum of HS broilers.展开更多
文摘目的观察用含不同浓度氟饮水喂养的SD大鼠所产的子鼠成釉细胞中基质金属蛋白酶-20(MMP-20)、激肽释放酶(KLK4)的表达变化,探讨氟牙症的发病机制。方法给母体SD大鼠分别饮用氟质量浓度为0、50、100mg/L的饮水,待母鼠自然分娩后,取其子鼠下颌骨制作切片并提取牙胚组织,分别用免疫组化和实时定量PCR方法检测不同染氟组大鼠成釉细胞中MMP-20及KLK4的蛋白及基因表达,应用Image-Pro Plus 6.0和GraphPad Prism 5软件对免疫组化和PCR数据结果进行分析。结果①随着饮水氟质量浓度的增加,成釉细胞中MMP-20蛋白及其mRNA的表达量逐渐减少;②KLK4蛋白和KLK4mRNA的表达量在两实验组呈现了类似的变化,但高氟组与低氟组间的差别不明显。结论氟可使成釉细胞减少对MMP-20及KLK4的分泌。这可能是釉基质蛋白降解延迟、釉质矿化异常,最终导致氟牙症产生的机制之一。
基金Key International Cooperation Program of the National Natural Science Foundation of China(32120103011)Jiangsu Shuang Chuang Tuan Dui program(JSSCTD202147)+1 种基金Jiangsu Shuang Chuang Ren Cai program(JSSCRC2021541)Initiation Funds of Yangzhou University for Distinguished Scientists.
文摘Background The aim of this study was to determine whether and how Zn proteinate with moderate chelation strength(Zn-Prot M)can alleviate heat stress(HS)-induced intestinal barrier function damage of broilers.A completely randomized design was used for comparatively testing the effects of Zn proteinate on HS and non-HS broilers.Under high temperature(HT),a 1(Control,HT-CON)+2(Zn source)×2(added Zn level)factorial arrangement of treatments was used.The 2 added Zn sources were Zn-Prot M and Zn sulfate(ZnS),and the 2 added Zn levels were 30 and 60 mg/kg.Under normal temperature(NT),a CON group(NT-CON)and pair-fed group(NT-PF)were included.Results The results showed that HS significantly reduced mRNA and protein expression levels of claudin-1,occludin,junctional adhesion molecule-A(JAMA),zonula occludens-1(ZO-1)and zinc finger protein A20(A20)in the jejunum,and HS also remarkably increased serum fluorescein isothiocyanate dextran(FITC-D),endotoxin and interleukin(IL)-1βcontents,serum diamine oxidase(DAO)and matrix metalloproteinase(MMP)-2 activities,nuclear factor kappa-B(NF-κB)p65 mRNA expression level,and protein expression levels of NF-κB p65 and MMP-2 in the jejunum.However,dietary supplementation with Zn,especially organic Zn as Zn-Prot M at 60 mg/kg,significantly decreased serum FITC-D,endotoxin and IL-1βcontents,serum DAO and MMP-2 activities,NF-κB p65 mRNA expression level,and protein expression levels of NF-κB p65 and MMP-2 in the jejunum of HS broilers,and notably promoted mRNA and protein expression levels of claudin-1,ZO-1 and A20.Conclusions Our results suggest that dietary Zn,especially 60 mg Zn/kg as Zn-Prot M,can alleviate HS-induced intestinal barrier function damage by promoting the expression of TJ proteins possibly via induction of A20-mediated suppression of the NF-κB p65/MMP-2 pathway in the jejunum of HS broilers.
