Objective:To study the effects of silent information regulator of transcription 2 (SIRT2) on inflammatory response and bone destruction in cartilage tissue of osteoarthritis.Methods: A total of 200 patients who underw...Objective:To study the effects of silent information regulator of transcription 2 (SIRT2) on inflammatory response and bone destruction in cartilage tissue of osteoarthritis.Methods: A total of 200 patients who underwent knee replacement due to knee osteoarthritis in Kashgar Prefecture First People's Hospital between September 2014 and September 2017 were selected as the osteoarthritis (OA) group of the research, and 80 patients who underwent knee replacement or meniscus operation due to trauma in Kashgar Prefecture First People's Hospital during the same period were selected as the control group. Articular cartilage tissue was collected after surgery to measure the expression of SIRT2 and bone destruction-related apoptosis molecules as well as the levels of inflammatory response molecules and bone destruction-related collagen metabolism molecules.Results: SIRT2 and Bcl-2 mRNA expression as well as SOX9 and Col-II levels in articular cartilage tissue of OA group were significantly lower than those of control group whereas TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression were significantly higher than those of control group;SIRT2 mRNA expression in articular cartilage tissue of OA group was positively correlated with Bcl-2 mRNA expression as well as SOX9 and Col-II levels, and negatively correlated with TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression.Conclusion: The lowly expressed SIRT2 in cartilage of osteoarthritis can aggravate inflammatory response and bone destruction.展开更多
Objective: To demonstrate whether the expression of silent mating type information regulation 2 homolog 1 (SIRT1) affects the level of TGF-β1 and Smad3 in HEK293 cells through regulating mTOR. Methods: First, recombi...Objective: To demonstrate whether the expression of silent mating type information regulation 2 homolog 1 (SIRT1) affects the level of TGF-β1 and Smad3 in HEK293 cells through regulating mTOR. Methods: First, recombinant plasmids DNA (rSIRT1) and siRNA targeting SIRT1 were constructed which were transfected into Human Embryonic Kidney 293 cell (HEK293) cells, respectively. Then, the generation of intracellular ROS in cells was examined by flow cytometry using the oxidation-sensitive probe. Last, the expressions of TGF-β1, smad3, P53, mTOR, p-mTOR, LC3-I and LC3-II in cells were detected to observe the effect of SIRT1 on TGF-β1 Pathway by western blot analysis. Results: We demonstrated that overexpressing of SIRT1 may decrease TGF-β1 and Smad3 expression in HEK293 cells through regulating mTOR. In addition, the result is the opposite when SIRT1 was silent in HEK293 cells. Conclusions: SIRT1 is closely related to TGF-β1/Smad3 pathway that correlates with the regulation of mTOR and ROS generation and causes diabetic nephropathy. The available evidence implies that SIRT1 has great potential as a clinical target for the prevention and treatment of renal fibrosis in the development of DN.展开更多
AIM： To detect the expression of miR-211 in age-related cataract tissue, explore the effects of miR-211 on lens epithelial cell proliferation and apoptosis, and identify its target gene.METHODS： This study used real...AIM： To detect the expression of miR-211 in age-related cataract tissue, explore the effects of miR-211 on lens epithelial cell proliferation and apoptosis, and identify its target gene.METHODS： This study used real-time quantitative polymerase chain reaction（RT-q PCR） to measure the expression of miR-211 and its predicted target gene [silent matingtype information regulation 2 homolog 1（SIRT1）] in 46 anterior lens capsules collected from age-related cataract patients. Human lens epithelial cell line（SRA01/04） cells were transfected with either miR-211 mimics, mimic controls, miR-211 inhibitors or inhibitor controls, 72 h after transfection, miR NA and protein expression of SIRT1 were measured using RT-qP CR and Western blotting; then cells were exposed to 200 μmol/L H2O2 for 1h, whereupon cell viability was measured by MTS assay, caspase-3 assay was performed. Dual luciferase reporter assay was performed to verify the relationship between miR-211 of SIRT1.RESULTS： Compared to the control group, expression of miR-211 was significantly increased（P〈0.001）, the miR NA and protein expression of SIRT1 were significantly decreased（P〈0.001） in the anterior lens capsules of patients with age-related cataracts. Relative to the control group, SIRT1 miR NA and protein levels in the miR-211 mimic group were significantly reduced, cell proliferation activity significantly decreased, and caspase-3 activity was significantly increased（P〈0.001）. In the miR-211 inhibitor group, SIRT1 miRNA and protein expression were significantly increased, cell proliferation activity significantly increased, and caspase-3 activity was significantly decreased（P〈0.001）. A dual luciferase reporter assay confirmed that SIRT1 is a direct target of miR-211.CONCLUSION： miR-211 is highly expressed in the anterior lens capsules of patients with age-related cataracts. By negatively regulating the expression of SIRT1, miR-211 promotes lens epithelial cell apoptosis and inhibits lens epithelial cell proliferation.展开更多
AIM:To explore the effect of silent information regulator factor 2-related enzyme 1(SIRT1)on modulating apoptosis of human lens epithelial cells(HLECs)and alleviating lens opacification of rats through suppressing end...AIM:To explore the effect of silent information regulator factor 2-related enzyme 1(SIRT1)on modulating apoptosis of human lens epithelial cells(HLECs)and alleviating lens opacification of rats through suppressing endoplasmic reticulum(ER)stress.METHODS:HLECs(SRA01/04)were treated with varying concentrations of tunicamycin(TM)for 24h,and the expression of SIRT1 and C/EBP homologous protein(CHOP)was assessed using real-time quantitative polymerase chain reaction(RT-PCR),Western blotting,and immunofluorescence.Cell morphology and proliferation was evaluated using an inverted microscope and cell counting kit-8(CCK-8)assay,respectively.In the SRA01/04 cell apoptosis model,which underwent siRNA transfection for SIRT1 knockdown and SRT1720 treatment for its activation,the expression levels of SIRT1,CHOP,glucose regulated protein 78(GRP78),and activating transcription factor 4(ATF4)were examined.The potential reversal of SIRT1 knockdown effects by 4-phenyl butyric acid(4-PBA;an ER stress inhibitor)was investigated.In vivo,age-related cataract(ARC)rat models were induced by sodium selenite injection,and the protective role of SIRT1,activated by SRT1720 intraperitoneal injections,was evaluated through morphology observation,hematoxylin and eosin(H&E)staining,Western blotting,and RT-PCR.RESULTS:SIRT1 expression was downregulated in TMinduced SRA01/04 cells.Besides,in SRA01/04 cells,both cell apoptosis and CHOP expression increased with the rising doses of TM.ER stress was stimulated by TM,as evidenced by the increased GRP78 and ATF4 in the SRA01/04 cell apoptosis model.Inhibition of SIRT1 by siRNA knockdown increased ER stress activation,whereas SRT1720 treatment had opposite results.4-PBA partly reverse the adverse effect of SIRT1 knockdown on apoptosis.In vivo,SRT1720 attenuated the lens opacification and weakened the ER stress activation in ARC rat models.CONCLUSION:SIRT1 plays a protective role against TM-induced apoptosis in HLECs and slows the progression of cataract in rats by inhibiting ER stress.These findings suggest a novel strategy for cataract treatment focused on targeting ER stress,highlighting the therapeutic potential of SIRT1 modulation in ARC development.展开更多
沉默信息调节因子2(silent information regulator 2,SIRT2)作为sirtuins蛋白家族成员广泛存在于真核生物之中,是具备调节生物生成和代谢调控过程作用的Ⅲ类去乙酰化酶,参与调控细胞分化、新陈代谢、衰老、DNA损伤修复、维持基因组完整...沉默信息调节因子2(silent information regulator 2,SIRT2)作为sirtuins蛋白家族成员广泛存在于真核生物之中,是具备调节生物生成和代谢调控过程作用的Ⅲ类去乙酰化酶,参与调控细胞分化、新陈代谢、衰老、DNA损伤修复、维持基因组完整性以及肿瘤的发生等。SIRT2的异常表达与多种肿瘤的发生发展具有密切关系,例如其在乳腺癌、宫颈癌、肺癌等恶性肿瘤方面的研究进展,SIRT2在发挥原癌基因作用的基础上,也发挥抑癌基因的作用。该文主要就SIRT2在肿瘤发生发展中的分子机制及其研究进展进行综述,以期为研究者开发肿瘤治疗药物提供新视野。展开更多
目的探讨固本降消汤联合达格列净经腺苷酸活化蛋白激酶(AMPK)信号通路、沉默信息调节因子调治2型糖尿病(T2DM)伴肥胖的效果及机制。方法选取2021年1—12月收治的T2DM伴肥胖120例,根据治疗方案不同将其分为观察组和对照组2组各60例。观...目的探讨固本降消汤联合达格列净经腺苷酸活化蛋白激酶(AMPK)信号通路、沉默信息调节因子调治2型糖尿病(T2DM)伴肥胖的效果及机制。方法选取2021年1—12月收治的T2DM伴肥胖120例,根据治疗方案不同将其分为观察组和对照组2组各60例。观察组采用固本降消汤联合达格列净治疗,对照组采用达格列净治疗,连续治疗3个月。比较2组治疗3个月后临床效果,治疗前及治疗1、3个月后血糖指标[空腹血糖(FPG)、糖化血红蛋白(HbA1c)、餐后2 h血糖(2 h PG)]、氧化应激指标[丙二醛(MDA)、超氧化物歧化酶(ROS)、谷胱甘肽过氧化物酶(GSH-Px)]、腺苷酸活化蛋白激酶α1/Toll样受体4(AMPKα1/TLR4)、转化生长因子-β1(TGF-β1)、核因子-κB(NF-κB)、能量平衡相关蛋白(Adropin)、鸢尾素(Irisin)、趋化素(Chemerin)及沉默信息调节因子1(SIRT1)、沉默信息调节因子3(SIRT3),以及治疗期间不良反应发生情况。结果治疗3个月后,总有效率观察组为96.67%高于对照组83.33%(P<0.05)。治疗1和3个月后,FPG、HbA1c、2 h PG、MDA、ROS、TGF-β1、NF-κB及Chemerin 2组均较治疗前降低,且观察组低于对照组;GSH-Px、AMPKα1/TLR4、Adropin、Irisin及SIRT1、SIRT32组均较治疗前升高,且观察组高于对照组(P<0.05,P<0.01)。治疗期间,不良反应总发生率观察组为13.33%,对照组为10.00%,2组比较差异无统计学意义(P>0.05)。结论固本降消汤联合达格列净调治T2DM伴肥胖可提高临床效果,改善血糖水平,减轻氧化应激损伤,并可经AMPK信号通路抑制肾损伤,调节SIRT1和SIRT3,延缓病情进展。展开更多
文摘Objective:To study the effects of silent information regulator of transcription 2 (SIRT2) on inflammatory response and bone destruction in cartilage tissue of osteoarthritis.Methods: A total of 200 patients who underwent knee replacement due to knee osteoarthritis in Kashgar Prefecture First People's Hospital between September 2014 and September 2017 were selected as the osteoarthritis (OA) group of the research, and 80 patients who underwent knee replacement or meniscus operation due to trauma in Kashgar Prefecture First People's Hospital during the same period were selected as the control group. Articular cartilage tissue was collected after surgery to measure the expression of SIRT2 and bone destruction-related apoptosis molecules as well as the levels of inflammatory response molecules and bone destruction-related collagen metabolism molecules.Results: SIRT2 and Bcl-2 mRNA expression as well as SOX9 and Col-II levels in articular cartilage tissue of OA group were significantly lower than those of control group whereas TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression were significantly higher than those of control group;SIRT2 mRNA expression in articular cartilage tissue of OA group was positively correlated with Bcl-2 mRNA expression as well as SOX9 and Col-II levels, and negatively correlated with TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression.Conclusion: The lowly expressed SIRT2 in cartilage of osteoarthritis can aggravate inflammatory response and bone destruction.
文摘Objective: To demonstrate whether the expression of silent mating type information regulation 2 homolog 1 (SIRT1) affects the level of TGF-β1 and Smad3 in HEK293 cells through regulating mTOR. Methods: First, recombinant plasmids DNA (rSIRT1) and siRNA targeting SIRT1 were constructed which were transfected into Human Embryonic Kidney 293 cell (HEK293) cells, respectively. Then, the generation of intracellular ROS in cells was examined by flow cytometry using the oxidation-sensitive probe. Last, the expressions of TGF-β1, smad3, P53, mTOR, p-mTOR, LC3-I and LC3-II in cells were detected to observe the effect of SIRT1 on TGF-β1 Pathway by western blot analysis. Results: We demonstrated that overexpressing of SIRT1 may decrease TGF-β1 and Smad3 expression in HEK293 cells through regulating mTOR. In addition, the result is the opposite when SIRT1 was silent in HEK293 cells. Conclusions: SIRT1 is closely related to TGF-β1/Smad3 pathway that correlates with the regulation of mTOR and ROS generation and causes diabetic nephropathy. The available evidence implies that SIRT1 has great potential as a clinical target for the prevention and treatment of renal fibrosis in the development of DN.
基金Supported by the National Natural Science Foundation of China(No.81170836No.81570838)+1 种基金the Natural Science Foundation of Liaoning Province,China(No.2015020474)the Liaoning Provincial Hospital Program for Building Treatment Capacity in Key Clinical Departments(No.LNCCC-D15-2015)
文摘AIM： To detect the expression of miR-211 in age-related cataract tissue, explore the effects of miR-211 on lens epithelial cell proliferation and apoptosis, and identify its target gene.METHODS： This study used real-time quantitative polymerase chain reaction（RT-q PCR） to measure the expression of miR-211 and its predicted target gene [silent matingtype information regulation 2 homolog 1（SIRT1）] in 46 anterior lens capsules collected from age-related cataract patients. Human lens epithelial cell line（SRA01/04） cells were transfected with either miR-211 mimics, mimic controls, miR-211 inhibitors or inhibitor controls, 72 h after transfection, miR NA and protein expression of SIRT1 were measured using RT-qP CR and Western blotting; then cells were exposed to 200 μmol/L H2O2 for 1h, whereupon cell viability was measured by MTS assay, caspase-3 assay was performed. Dual luciferase reporter assay was performed to verify the relationship between miR-211 of SIRT1.RESULTS： Compared to the control group, expression of miR-211 was significantly increased（P〈0.001）, the miR NA and protein expression of SIRT1 were significantly decreased（P〈0.001） in the anterior lens capsules of patients with age-related cataracts. Relative to the control group, SIRT1 miR NA and protein levels in the miR-211 mimic group were significantly reduced, cell proliferation activity significantly decreased, and caspase-3 activity was significantly increased（P〈0.001）. In the miR-211 inhibitor group, SIRT1 miRNA and protein expression were significantly increased, cell proliferation activity significantly increased, and caspase-3 activity was significantly decreased（P〈0.001）. A dual luciferase reporter assay confirmed that SIRT1 is a direct target of miR-211.CONCLUSION： miR-211 is highly expressed in the anterior lens capsules of patients with age-related cataracts. By negatively regulating the expression of SIRT1, miR-211 promotes lens epithelial cell apoptosis and inhibits lens epithelial cell proliferation.
基金Supported by National Natural Science Foundation for Young Scientists of China(No.82101097)National Natural Science Foundation of China(No.82070937).
文摘AIM:To explore the effect of silent information regulator factor 2-related enzyme 1(SIRT1)on modulating apoptosis of human lens epithelial cells(HLECs)and alleviating lens opacification of rats through suppressing endoplasmic reticulum(ER)stress.METHODS:HLECs(SRA01/04)were treated with varying concentrations of tunicamycin(TM)for 24h,and the expression of SIRT1 and C/EBP homologous protein(CHOP)was assessed using real-time quantitative polymerase chain reaction(RT-PCR),Western blotting,and immunofluorescence.Cell morphology and proliferation was evaluated using an inverted microscope and cell counting kit-8(CCK-8)assay,respectively.In the SRA01/04 cell apoptosis model,which underwent siRNA transfection for SIRT1 knockdown and SRT1720 treatment for its activation,the expression levels of SIRT1,CHOP,glucose regulated protein 78(GRP78),and activating transcription factor 4(ATF4)were examined.The potential reversal of SIRT1 knockdown effects by 4-phenyl butyric acid(4-PBA;an ER stress inhibitor)was investigated.In vivo,age-related cataract(ARC)rat models were induced by sodium selenite injection,and the protective role of SIRT1,activated by SRT1720 intraperitoneal injections,was evaluated through morphology observation,hematoxylin and eosin(H&E)staining,Western blotting,and RT-PCR.RESULTS:SIRT1 expression was downregulated in TMinduced SRA01/04 cells.Besides,in SRA01/04 cells,both cell apoptosis and CHOP expression increased with the rising doses of TM.ER stress was stimulated by TM,as evidenced by the increased GRP78 and ATF4 in the SRA01/04 cell apoptosis model.Inhibition of SIRT1 by siRNA knockdown increased ER stress activation,whereas SRT1720 treatment had opposite results.4-PBA partly reverse the adverse effect of SIRT1 knockdown on apoptosis.In vivo,SRT1720 attenuated the lens opacification and weakened the ER stress activation in ARC rat models.CONCLUSION:SIRT1 plays a protective role against TM-induced apoptosis in HLECs and slows the progression of cataract in rats by inhibiting ER stress.These findings suggest a novel strategy for cataract treatment focused on targeting ER stress,highlighting the therapeutic potential of SIRT1 modulation in ARC development.
文摘沉默信息调节因子2(silent information regulator 2,SIRT2)作为sirtuins蛋白家族成员广泛存在于真核生物之中,是具备调节生物生成和代谢调控过程作用的Ⅲ类去乙酰化酶,参与调控细胞分化、新陈代谢、衰老、DNA损伤修复、维持基因组完整性以及肿瘤的发生等。SIRT2的异常表达与多种肿瘤的发生发展具有密切关系,例如其在乳腺癌、宫颈癌、肺癌等恶性肿瘤方面的研究进展,SIRT2在发挥原癌基因作用的基础上,也发挥抑癌基因的作用。该文主要就SIRT2在肿瘤发生发展中的分子机制及其研究进展进行综述,以期为研究者开发肿瘤治疗药物提供新视野。
文摘目的探讨固本降消汤联合达格列净经腺苷酸活化蛋白激酶(AMPK)信号通路、沉默信息调节因子调治2型糖尿病(T2DM)伴肥胖的效果及机制。方法选取2021年1—12月收治的T2DM伴肥胖120例,根据治疗方案不同将其分为观察组和对照组2组各60例。观察组采用固本降消汤联合达格列净治疗,对照组采用达格列净治疗,连续治疗3个月。比较2组治疗3个月后临床效果,治疗前及治疗1、3个月后血糖指标[空腹血糖(FPG)、糖化血红蛋白(HbA1c)、餐后2 h血糖(2 h PG)]、氧化应激指标[丙二醛(MDA)、超氧化物歧化酶(ROS)、谷胱甘肽过氧化物酶(GSH-Px)]、腺苷酸活化蛋白激酶α1/Toll样受体4(AMPKα1/TLR4)、转化生长因子-β1(TGF-β1)、核因子-κB(NF-κB)、能量平衡相关蛋白(Adropin)、鸢尾素(Irisin)、趋化素(Chemerin)及沉默信息调节因子1(SIRT1)、沉默信息调节因子3(SIRT3),以及治疗期间不良反应发生情况。结果治疗3个月后,总有效率观察组为96.67%高于对照组83.33%(P<0.05)。治疗1和3个月后,FPG、HbA1c、2 h PG、MDA、ROS、TGF-β1、NF-κB及Chemerin 2组均较治疗前降低,且观察组低于对照组;GSH-Px、AMPKα1/TLR4、Adropin、Irisin及SIRT1、SIRT32组均较治疗前升高,且观察组高于对照组(P<0.05,P<0.01)。治疗期间,不良反应总发生率观察组为13.33%,对照组为10.00%,2组比较差异无统计学意义(P>0.05)。结论固本降消汤联合达格列净调治T2DM伴肥胖可提高临床效果,改善血糖水平,减轻氧化应激损伤,并可经AMPK信号通路抑制肾损伤,调节SIRT1和SIRT3,延缓病情进展。
