目的研究低氧诱导因子HIF2α在胶原蛋白酶诱发兔膝关节骨性关节炎(Osteoarthritis,OA)模型中的表达情况,为下一步以HIF2α为靶点进行OA靶向治疗研究提供实验基础。方法取健康16周龄雄性日本大耳白兔24只,随机分为磷酸盐缓冲液(PBS)对照...目的研究低氧诱导因子HIF2α在胶原蛋白酶诱发兔膝关节骨性关节炎(Osteoarthritis,OA)模型中的表达情况,为下一步以HIF2α为靶点进行OA靶向治疗研究提供实验基础。方法取健康16周龄雄性日本大耳白兔24只,随机分为磷酸盐缓冲液(PBS)对照组和胶原蛋白酶诱发OA(Collagenase-induced OA,CIOA)组。利用右侧膝关节腔内注射II型胶原蛋白酶(剂量为0.5 mg)方法建立膝关节OA模型。给药后24周处死动物,采用大体形态观察与HE、甲苯胺蓝染色观察关节软骨退变程度,应用微型CT(Micro-CT)观察软骨下骨改变情况,采用免疫组织化学(immunohistochemistry,IHC)、蛋白质免疫印迹(Western blotting,WB)和实时荧光定量PCR(quantitative real time PCR,qRT-PCR)检测软骨中HIF2α表达情况。结果大体形态观察结果显示,CIOA组关节面粗糙、糜烂,与溃疡形成,关节囊增厚,滑膜增生。组织病理学检测结果显示,CIOA组关节软骨缺损,软骨细胞数量减少,排序紊乱,有细胞簇聚现象。Micro-CT结果显示,CIOA组软骨下骨可见大量骨赘形成,关节间隙狭窄。IHC结果显示,CIOA组关节软骨中HIF2α蛋白阳性细胞数增加;WB结果显示,CIOA组关节软骨组织中HIF2α蛋白表达显著增加;而qRT-PCR结果显示,HIF2αmRNA表达显著降低。结论在成功建立膝关节OA模型基础上,发现HIF2α在胶原蛋白酶诱发兔膝关节OA软骨中表达上调,其表达调控可能在转录后水平进行。我们的实验结果提示HIF2α特异性抑制剂可能被用于缓解OA发生。展开更多
Objective: To observe the effect of total flavonoids of Scutellaria barbata (TF‑SB) on the injury of high glucose induced podocytes (MPC‑5) and the influence of Smad4/PKM2/HIF‑1α pathway. Methods: Firstly, CCK8 was u...Objective: To observe the effect of total flavonoids of Scutellaria barbata (TF‑SB) on the injury of high glucose induced podocytes (MPC‑5) and the influence of Smad4/PKM2/HIF‑1α pathway. Methods: Firstly, CCK8 was used to analyze the safety and efficacy concentration of TF‑SB on MPC‑5 cells. Then, MPC‑5 was then divided into the control group, model group and TF‑SB group. In addition to the control group, model group and TF‑SB group were induced by high glucose to establish MPC‑5 cell injury model. The effects of TF‑SB on ATP, apoptosis and ROS levels of MPC‑5 cells were detected respectively. The contents of IL‑1β, TNF‑α, and MCP‑1 were determined by ELISA, the expression abundance of glycolytic genes (GLU1, PFK1 and HK1) were detected by RT‑PCR. Western blot method was used to detect the expression level of related proteins in Smad4/PKM2/HIF‑1α pathway. Results: Compared with the blank group, ATP content, GLU1, PKF1 and HK1 expression abundance of MPC‑5 cells in the model group decreased significantly, apoptosis, ROS level and IL‑1 β、 TNF‑ α And MCP‑1 significantly increased (P<0.01);Compared with model group, ATP content, GLU1, PKF1 and HK1 expression abundance, apoptosis, ROS level and IL‑1β in TF‑SB group were significantly increased , TNF‑ α The contents of MCP‑1 and MCP‑1 decreased significantly (P<0.01). In addition, compared with the blank group, the model group Smad4 and HIF‑1 α The protein expression and PKM2 expression in nucleus were significantly increased, while PKM2 expression in cytoplasm was significantly decreased (P<0.01);Compared with model group, TF‑SB group Smad4, HIF‑1 α The expression of PKM2 in the nucleus and expression of PKM2 were significantly decreased, while the expression of PKM2 in the cytoplasm was significantly increased (P<0.01). Conclusion: TF‑SB promotes the mitochondrial activity of MPC‑5 cells to induce glycolysis, and then inhibits the secretion of inflammation, which may play a role in treating diabetes nephropathy by inhibiting Smad4/PKM2/HIF‑1α signaling pathway.展开更多
Objective:Several reports have proposed that lnc RNAs,as potential biomarkers,participate in the progression and growth of malignant tumors.HIF1 A-AS2 is a novel lnc RNA and potential biomarker,involved in the genesis...Objective:Several reports have proposed that lnc RNAs,as potential biomarkers,participate in the progression and growth of malignant tumors.HIF1 A-AS2 is a novel lnc RNA and potential biomarker,involved in the genesis and development of carcinomas.However,the molecular mechanism of HIF1 A-AS2 in renal carcinoma is unclear.Methods:The relative expression levels of HIF1 A-AS2 and miR-30 a-5 p were detected using RT-qPCR in renal carcinoma tissues and cell lines.Using loss-of-function and overexpression,the biological effects of HIF1 A-AS2 and miR-30 a-5 p in kidney carcinoma progression were characterized.Dual luciferase reporter gene analysis and Western blot were used to detect the potential mechanism of HIF1 A-AS2 in renal carcinomas.Results:HIF1 A-AS2 was upregulated in kidney carcinoma tissues when compared with para-carcinoma tissues(P<0.05).In addition,tumor size,tumor node mestastasis stage and differentiation were identified as being closely associated with HIF1 A-AS2 expression(P<0.05).Knockdown or overexpression of HIF1 A-AS2 either restrained or promoted the malignant phenotype and WNT/β-catenin signaling in renal carcinoma cells(P<0.05).Mi R-30 a-5 p was downregulated in renal cancers and partially reversed HIF1 A-AS2 functions in malignant renal tumor cells.HIF1 A-AS2 acted as a micro RNA sponge that actively regulated the relative expression of SOX4 in sponging miR-30 a-5 p and subsequently increased the malignant phenotypes of renal carcinomas.HIF1 A-AS2 showed a carcinogenic effect and miR-30 a-5 p acted as an antagonist of the anti-oncogene effects in the pathogenesis of renal carcinomas.Conclusions:The HIF1 A-AS2-miR-30 a-5 p-SOX4 axis was associated with the malignant progression and development of renal carcinoma.The relative expression of HIF1 A-AS2 was negatively correlated with the expression of miR-30 a-5 p,and was closely correlated with SOX4 mRNA levels in renal cancers.展开更多
Objective： Bone morphogenetic protein receptor 2（BMPR2） and hypoxia-inducible factor 1-α（HIF1-α） existed abnormal expression in several types of cancer. However, their expressions and related roles in osteosarc...Objective： Bone morphogenetic protein receptor 2（BMPR2） and hypoxia-inducible factor 1-α（HIF1-α） existed abnormal expression in several types of cancer. However, their expressions and related roles in osteosarcoma are largely unknown.Methods：To investigate the clinical significance of BMPR2 and HIF1-αin osteosarcoma,we analyzed their expression levels in 103 osteosarcoma specimens by immunochemistry.Meanwhile,we conducted a follow-up to examine the metastatic behavior and overall survival（OS）of osteosarcoma patients.Results：Among 103 tissues,61 cases had BMPR2-positive expression and 57 cases had HIF1-αpositive expression.A significant correlation was noticed between BMPR2 and HIF1-αexpression in osteosarcoma specimens（P=0.035）.Receiver-operating characteristic（ROC）curves were calculated to investigate the predictive value of the two markers in tumor metastasis.By means of univariate and multivariate analysis,BMPR2 and HIF1-αexpression,as well as higher tumor grade,were identified as significant risk factors for OS in patients with osteosarcoma.Kaplan-Meier survival analysis revealed that the patients with BMPR2 and HIF1-αpositive expression had worse OS compared with patients with BMPR2-negative or HIF1-α-negative staining.Conclusions：It can be concluded that BMPR2 and HIF1-αexpression is highly correlated with metastatic behavior in patients with osteosarcoma and can serve as predictive markers for metastasis and OS of these patients.展开更多
Hypoxia-inducible factors(HIFs)a re transcriptional regulators playing important roles in adapting various types of cells to physiological and pathological hypoxia cues.Three structurally related,oxygen-sensitive HIF...Hypoxia-inducible factors(HIFs)a re transcriptional regulators playing important roles in adapting various types of cells to physiological and pathological hypoxia cues.Three structurally related,oxygen-sensitive HIFαproteins have been identified(HIF1α,HIF2α,and HIF3α),among which HIF3αhas weak transcriptional capacity because of the absence of the C-terminal transactivation domain as present in HIF1αand HIF2α.展开更多
文摘目的研究低氧诱导因子HIF2α在胶原蛋白酶诱发兔膝关节骨性关节炎(Osteoarthritis,OA)模型中的表达情况,为下一步以HIF2α为靶点进行OA靶向治疗研究提供实验基础。方法取健康16周龄雄性日本大耳白兔24只,随机分为磷酸盐缓冲液(PBS)对照组和胶原蛋白酶诱发OA(Collagenase-induced OA,CIOA)组。利用右侧膝关节腔内注射II型胶原蛋白酶(剂量为0.5 mg)方法建立膝关节OA模型。给药后24周处死动物,采用大体形态观察与HE、甲苯胺蓝染色观察关节软骨退变程度,应用微型CT(Micro-CT)观察软骨下骨改变情况,采用免疫组织化学(immunohistochemistry,IHC)、蛋白质免疫印迹(Western blotting,WB)和实时荧光定量PCR(quantitative real time PCR,qRT-PCR)检测软骨中HIF2α表达情况。结果大体形态观察结果显示,CIOA组关节面粗糙、糜烂,与溃疡形成,关节囊增厚,滑膜增生。组织病理学检测结果显示,CIOA组关节软骨缺损,软骨细胞数量减少,排序紊乱,有细胞簇聚现象。Micro-CT结果显示,CIOA组软骨下骨可见大量骨赘形成,关节间隙狭窄。IHC结果显示,CIOA组关节软骨中HIF2α蛋白阳性细胞数增加;WB结果显示,CIOA组关节软骨组织中HIF2α蛋白表达显著增加;而qRT-PCR结果显示,HIF2αmRNA表达显著降低。结论在成功建立膝关节OA模型基础上,发现HIF2α在胶原蛋白酶诱发兔膝关节OA软骨中表达上调,其表达调控可能在转录后水平进行。我们的实验结果提示HIF2α特异性抑制剂可能被用于缓解OA发生。
基金Heilongjiang Traditional Chinese Medicine Research Project (No.ZHY19?058)。
文摘Objective: To observe the effect of total flavonoids of Scutellaria barbata (TF‑SB) on the injury of high glucose induced podocytes (MPC‑5) and the influence of Smad4/PKM2/HIF‑1α pathway. Methods: Firstly, CCK8 was used to analyze the safety and efficacy concentration of TF‑SB on MPC‑5 cells. Then, MPC‑5 was then divided into the control group, model group and TF‑SB group. In addition to the control group, model group and TF‑SB group were induced by high glucose to establish MPC‑5 cell injury model. The effects of TF‑SB on ATP, apoptosis and ROS levels of MPC‑5 cells were detected respectively. The contents of IL‑1β, TNF‑α, and MCP‑1 were determined by ELISA, the expression abundance of glycolytic genes (GLU1, PFK1 and HK1) were detected by RT‑PCR. Western blot method was used to detect the expression level of related proteins in Smad4/PKM2/HIF‑1α pathway. Results: Compared with the blank group, ATP content, GLU1, PKF1 and HK1 expression abundance of MPC‑5 cells in the model group decreased significantly, apoptosis, ROS level and IL‑1 β、 TNF‑ α And MCP‑1 significantly increased (P<0.01);Compared with model group, ATP content, GLU1, PKF1 and HK1 expression abundance, apoptosis, ROS level and IL‑1β in TF‑SB group were significantly increased , TNF‑ α The contents of MCP‑1 and MCP‑1 decreased significantly (P<0.01). In addition, compared with the blank group, the model group Smad4 and HIF‑1 α The protein expression and PKM2 expression in nucleus were significantly increased, while PKM2 expression in cytoplasm was significantly decreased (P<0.01);Compared with model group, TF‑SB group Smad4, HIF‑1 α The expression of PKM2 in the nucleus and expression of PKM2 were significantly decreased, while the expression of PKM2 in the cytoplasm was significantly increased (P<0.01). Conclusion: TF‑SB promotes the mitochondrial activity of MPC‑5 cells to induce glycolysis, and then inhibits the secretion of inflammation, which may play a role in treating diabetes nephropathy by inhibiting Smad4/PKM2/HIF‑1α signaling pathway.
基金supported by grants from the National Natural Science Foundations of China(Grant Nos.81702511,81472401,81772708,and 2016YFA0201204)the Jiangsu Provincial Key Medical Discipline(Grant No.ZDXKA2016012)+1 种基金the Clinical Medicine Center of Suzhou(Grant No.SZZXJ201501)programs for Recruitment of Clinical Medical Top Team of Suzhou。
文摘Objective:Several reports have proposed that lnc RNAs,as potential biomarkers,participate in the progression and growth of malignant tumors.HIF1 A-AS2 is a novel lnc RNA and potential biomarker,involved in the genesis and development of carcinomas.However,the molecular mechanism of HIF1 A-AS2 in renal carcinoma is unclear.Methods:The relative expression levels of HIF1 A-AS2 and miR-30 a-5 p were detected using RT-qPCR in renal carcinoma tissues and cell lines.Using loss-of-function and overexpression,the biological effects of HIF1 A-AS2 and miR-30 a-5 p in kidney carcinoma progression were characterized.Dual luciferase reporter gene analysis and Western blot were used to detect the potential mechanism of HIF1 A-AS2 in renal carcinomas.Results:HIF1 A-AS2 was upregulated in kidney carcinoma tissues when compared with para-carcinoma tissues(P<0.05).In addition,tumor size,tumor node mestastasis stage and differentiation were identified as being closely associated with HIF1 A-AS2 expression(P<0.05).Knockdown or overexpression of HIF1 A-AS2 either restrained or promoted the malignant phenotype and WNT/β-catenin signaling in renal carcinoma cells(P<0.05).Mi R-30 a-5 p was downregulated in renal cancers and partially reversed HIF1 A-AS2 functions in malignant renal tumor cells.HIF1 A-AS2 acted as a micro RNA sponge that actively regulated the relative expression of SOX4 in sponging miR-30 a-5 p and subsequently increased the malignant phenotypes of renal carcinomas.HIF1 A-AS2 showed a carcinogenic effect and miR-30 a-5 p acted as an antagonist of the anti-oncogene effects in the pathogenesis of renal carcinomas.Conclusions:The HIF1 A-AS2-miR-30 a-5 p-SOX4 axis was associated with the malignant progression and development of renal carcinoma.The relative expression of HIF1 A-AS2 was negatively correlated with the expression of miR-30 a-5 p,and was closely correlated with SOX4 mRNA levels in renal cancers.
基金supported by grants from the National Natural Science Foundation of China (No. 81572633)
文摘Objective： Bone morphogenetic protein receptor 2（BMPR2） and hypoxia-inducible factor 1-α（HIF1-α） existed abnormal expression in several types of cancer. However, their expressions and related roles in osteosarcoma are largely unknown.Methods：To investigate the clinical significance of BMPR2 and HIF1-αin osteosarcoma,we analyzed their expression levels in 103 osteosarcoma specimens by immunochemistry.Meanwhile,we conducted a follow-up to examine the metastatic behavior and overall survival（OS）of osteosarcoma patients.Results：Among 103 tissues,61 cases had BMPR2-positive expression and 57 cases had HIF1-αpositive expression.A significant correlation was noticed between BMPR2 and HIF1-αexpression in osteosarcoma specimens（P=0.035）.Receiver-operating characteristic（ROC）curves were calculated to investigate the predictive value of the two markers in tumor metastasis.By means of univariate and multivariate analysis,BMPR2 and HIF1-αexpression,as well as higher tumor grade,were identified as significant risk factors for OS in patients with osteosarcoma.Kaplan-Meier survival analysis revealed that the patients with BMPR2 and HIF1-αpositive expression had worse OS compared with patients with BMPR2-negative or HIF1-α-negative staining.Conclusions：It can be concluded that BMPR2 and HIF1-αexpression is highly correlated with metastatic behavior in patients with osteosarcoma and can serve as predictive markers for metastasis and OS of these patients.
基金supported by NIH/NINDS(R21NS109790 and R01NS094559)(to FG)Shriners Hospitals for Children(85107-NCA-19 to FG,and 84307-NCAL to SZ)。
文摘Hypoxia-inducible factors(HIFs)a re transcriptional regulators playing important roles in adapting various types of cells to physiological and pathological hypoxia cues.Three structurally related,oxygen-sensitive HIFαproteins have been identified(HIF1α,HIF2α,and HIF3α),among which HIF3αhas weak transcriptional capacity because of the absence of the C-terminal transactivation domain as present in HIF1αand HIF2α.
