目的探讨脑和肌肉芳香烃受体核转运样蛋白1(brain and muscle ARNT-like protein 1,BMAL1)在大鼠牙周炎诱导肝损伤模型中的作用。方法根据随机数字表法将12只Wistar雄性大鼠随机分为对照组和牙周炎组,每组6只。对照组大鼠不做处理。牙...目的探讨脑和肌肉芳香烃受体核转运样蛋白1(brain and muscle ARNT-like protein 1,BMAL1)在大鼠牙周炎诱导肝损伤模型中的作用。方法根据随机数字表法将12只Wistar雄性大鼠随机分为对照组和牙周炎组,每组6只。对照组大鼠不做处理。牙周炎组大鼠通过结扎双侧上颌第一磨牙颈部建立牙周炎模型。建模8周后检测两组大鼠牙周临床指标并处死。显微CT(micro-CT)扫描大鼠上颌骨并分析牙槽骨吸收情况。HE及油红O染色分析两组大鼠牙周组织和肝组织的病理变化。生化试剂盒检测血清中谷草转氨酶(glutamic-oxaloacetic transaminase,GOT)、谷丙转氨酶(glutamic-pyruvic transaminase,GPT)、总胆固醇(total cholesterol,TC)和甘油三酯(triglyceride,TG)等肝功能相关指标。实时荧光定量PCR(real time fluorescent quantitative-PCR,qRT-PCR)、免疫组化和蛋白质印迹法检测肝组织中BMAL1、核因子-κB(nuclear factor kappa-B,NF-κB)和肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)基因及蛋白的表达水平。原位末端转移酶标记(terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling,TUNEL)试剂盒染色法检测肝组织中的细胞凋亡。结果上颌第一磨牙HE染色和micro-CT结果显示,牙周炎组大鼠牙槽骨吸收明显。肝组织病理学结果显示,与对照组相比,牙周炎组肝组织内炎症细胞浸润、肝索结构紊乱且肝细胞中可见大量脂滴形成。大鼠血清生化检测结果显示,牙周炎组大鼠血清中GOT[(62.77±2.59)U/L]、GPT[(47.54±1.04)U/L]、TC[(3.19±0.23)mmol/L]和TG[(1.11±0.09)mmol/L]均较对照组GOT[(38.66±2.47)U/L]、GPT[(31.48±1.57)U/L]、TC[(1.60±0.05)mmol/L]和TG[(0.61±0.09)mmol/L]含量显著升高(P=0.003,P=0.001,P=0.002,P=0.038)。qRT-PCR结果显示,牙周炎组大鼠肝组织中BMAL1 mRNA的表达[(0.60±0.04)%]较对照组[(1.01±0.07)%]显著下调(t=4.80,P=0.009),NF-κB、TNF-αmRNA的表达[(1.62±0.12)%、(2.69±0.16)%]均较对照组[(1.00±0.03)%、(1.03±0.16)%]显著上调(P=0.008,P=0.002)。免疫组化结果显示:牙周炎组大鼠肝组织中BMAL1蛋白表达(平均光密度值)(11.58±2.15)较对照组(22.66±1.67)显著下调(P=0.015),而NF-κB、TNF-α表达(31.77±2.69、24.31±2.32)均较对照组(19.40±1.82、11.92±0.94)显著上调(P=0.019,P=0.008)。蛋白质印迹法结果显示:牙周炎组大鼠肝组织中BMAL1蛋白表达[(0.63±0.10)%]较对照组[(1.00±0.06)%]显著下调(t=3.19,P=0.033),NF-κB、TNF-α表达[(1.61±0.12)%、(2.82±0.23)%]均较对照组[(1.00±0.12)%、(1.00±0.11)%]显著上调(P=0.022,P=0.002)。TUNEL染色结果显示牙周炎组大鼠肝组织中凋亡细胞较对照组增多。结论牙周炎可能通过下调大鼠肝组织中BMAL1的表达激活NF-κB信号分子,引起大鼠肝脏组织中炎症水平和凋亡水平升高,最终诱导肝损伤。展开更多
Large bone defects resulting from fractures and disease are a major clinical challenge,being often unable to heal spontaneously by the body’s repair mechanisms.Lines of evidence have shown that hypoxia-induced overpr...Large bone defects resulting from fractures and disease are a major clinical challenge,being often unable to heal spontaneously by the body’s repair mechanisms.Lines of evidence have shown that hypoxia-induced overproduction of ROS in bone defect region has a major impact on delaying bone regeneration.However,replenishing excess oxygen in a short time cause high oxygen tension that affect the activity of osteoblast precursor cells.Therefore,reasonably restoring the hypoxic condition of bone microenvironment is essential for facilitating bone repair.Herein,we designed ROS scavenging and responsive prolonged oxygen-generating hydrogels(CPP-L/GelMA)as a“bone microenvironment regulative hydrogel”to reverse the hypoxic microenvironment in bone defects region.CPP-L/GelMA hydrogels comprises an antioxidant enzyme catalase(CAT)and ROS-responsive oxygen-releasing nanoparticles(PFC@PLGA/PPS)co-loaded liposome(CCP-L)and GelMA hydrogels.Under hypoxic condition,CPP-L/GelMA can release CAT for degrading hydrogen peroxide to generate oxygen and be triggered by superfluous ROS to continuously release the oxygen for more than 2 weeks.The prolonged oxygen enriched microenvironment generated by CPP-L/GelMA hydrogel significantly enhanced angiogenesis and osteogenesis while inhibited osteoclastogenesis.Finally,CPP-L/GelMA showed excellent bone regeneration effect in a mice skull defect model through the Nrf2-BMAL1-autophagy pathway.Hence,CPP-L/GelMA,as a bone microenvironment regulative hydrogel for bone tissue respiration,can effectively scavenge ROS and provide prolonged oxygen supply according to the demand in bone defect region,possessing of great clinical therapeutic potential.展开更多
文摘目的探讨脑和肌肉芳香烃受体核转运样蛋白1(brain and muscle ARNT-like protein 1,BMAL1)在大鼠牙周炎诱导肝损伤模型中的作用。方法根据随机数字表法将12只Wistar雄性大鼠随机分为对照组和牙周炎组,每组6只。对照组大鼠不做处理。牙周炎组大鼠通过结扎双侧上颌第一磨牙颈部建立牙周炎模型。建模8周后检测两组大鼠牙周临床指标并处死。显微CT(micro-CT)扫描大鼠上颌骨并分析牙槽骨吸收情况。HE及油红O染色分析两组大鼠牙周组织和肝组织的病理变化。生化试剂盒检测血清中谷草转氨酶(glutamic-oxaloacetic transaminase,GOT)、谷丙转氨酶(glutamic-pyruvic transaminase,GPT)、总胆固醇(total cholesterol,TC)和甘油三酯(triglyceride,TG)等肝功能相关指标。实时荧光定量PCR(real time fluorescent quantitative-PCR,qRT-PCR)、免疫组化和蛋白质印迹法检测肝组织中BMAL1、核因子-κB(nuclear factor kappa-B,NF-κB)和肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)基因及蛋白的表达水平。原位末端转移酶标记(terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling,TUNEL)试剂盒染色法检测肝组织中的细胞凋亡。结果上颌第一磨牙HE染色和micro-CT结果显示,牙周炎组大鼠牙槽骨吸收明显。肝组织病理学结果显示,与对照组相比,牙周炎组肝组织内炎症细胞浸润、肝索结构紊乱且肝细胞中可见大量脂滴形成。大鼠血清生化检测结果显示,牙周炎组大鼠血清中GOT[(62.77±2.59)U/L]、GPT[(47.54±1.04)U/L]、TC[(3.19±0.23)mmol/L]和TG[(1.11±0.09)mmol/L]均较对照组GOT[(38.66±2.47)U/L]、GPT[(31.48±1.57)U/L]、TC[(1.60±0.05)mmol/L]和TG[(0.61±0.09)mmol/L]含量显著升高(P=0.003,P=0.001,P=0.002,P=0.038)。qRT-PCR结果显示,牙周炎组大鼠肝组织中BMAL1 mRNA的表达[(0.60±0.04)%]较对照组[(1.01±0.07)%]显著下调(t=4.80,P=0.009),NF-κB、TNF-αmRNA的表达[(1.62±0.12)%、(2.69±0.16)%]均较对照组[(1.00±0.03)%、(1.03±0.16)%]显著上调(P=0.008,P=0.002)。免疫组化结果显示:牙周炎组大鼠肝组织中BMAL1蛋白表达(平均光密度值)(11.58±2.15)较对照组(22.66±1.67)显著下调(P=0.015),而NF-κB、TNF-α表达(31.77±2.69、24.31±2.32)均较对照组(19.40±1.82、11.92±0.94)显著上调(P=0.019,P=0.008)。蛋白质印迹法结果显示:牙周炎组大鼠肝组织中BMAL1蛋白表达[(0.63±0.10)%]较对照组[(1.00±0.06)%]显著下调(t=3.19,P=0.033),NF-κB、TNF-α表达[(1.61±0.12)%、(2.82±0.23)%]均较对照组[(1.00±0.12)%、(1.00±0.11)%]显著上调(P=0.022,P=0.002)。TUNEL染色结果显示牙周炎组大鼠肝组织中凋亡细胞较对照组增多。结论牙周炎可能通过下调大鼠肝组织中BMAL1的表达激活NF-κB信号分子,引起大鼠肝脏组织中炎症水平和凋亡水平升高,最终诱导肝损伤。
基金supported by National Science Foundation of China(Grant No.32271409,82002370,31800806)National Basic Research Program of China(2021YFA1201404)+5 种基金China Postdoctoral Science Foundation(Grant No.2019M661806)Major Project of NSFC(81991514)Natural Science Foundation of Jiangsu Province(Grant No.BK20200117)Jiangsu postdoctoral research support project(Grant No.2021K059A)Program of Innovation and Entrepreneurship of Jiangsu Province,Jiangsu Provincial Key Medical Center Foundation,Jiangsu Provincial Medical Outstanding Talent Foundation,Jiangsu Provincial Medical Youth Talent Foundation and Jiangsu Provincial Key Medical Talent Foundation,the Fundamental Research Funds for the Central Universities(14380493,14380494)Changzhou Sci&Tech Program(Grant No.CJ20220103).
文摘Large bone defects resulting from fractures and disease are a major clinical challenge,being often unable to heal spontaneously by the body’s repair mechanisms.Lines of evidence have shown that hypoxia-induced overproduction of ROS in bone defect region has a major impact on delaying bone regeneration.However,replenishing excess oxygen in a short time cause high oxygen tension that affect the activity of osteoblast precursor cells.Therefore,reasonably restoring the hypoxic condition of bone microenvironment is essential for facilitating bone repair.Herein,we designed ROS scavenging and responsive prolonged oxygen-generating hydrogels(CPP-L/GelMA)as a“bone microenvironment regulative hydrogel”to reverse the hypoxic microenvironment in bone defects region.CPP-L/GelMA hydrogels comprises an antioxidant enzyme catalase(CAT)and ROS-responsive oxygen-releasing nanoparticles(PFC@PLGA/PPS)co-loaded liposome(CCP-L)and GelMA hydrogels.Under hypoxic condition,CPP-L/GelMA can release CAT for degrading hydrogen peroxide to generate oxygen and be triggered by superfluous ROS to continuously release the oxygen for more than 2 weeks.The prolonged oxygen enriched microenvironment generated by CPP-L/GelMA hydrogel significantly enhanced angiogenesis and osteogenesis while inhibited osteoclastogenesis.Finally,CPP-L/GelMA showed excellent bone regeneration effect in a mice skull defect model through the Nrf2-BMAL1-autophagy pathway.Hence,CPP-L/GelMA,as a bone microenvironment regulative hydrogel for bone tissue respiration,can effectively scavenge ROS and provide prolonged oxygen supply according to the demand in bone defect region,possessing of great clinical therapeutic potential.
