Mercury ion(Hg^(2+)),a highly noxious of heavy metalion,has detrimental effects on the ecological environment and human health.Herein,we have developed an exonuclease III(Exo III)assisted catalytic hairpin assembly fo...Mercury ion(Hg^(2+)),a highly noxious of heavy metalion,has detrimental effects on the ecological environment and human health.Herein,we have developed an exonuclease III(Exo III)assisted catalytic hairpin assembly formation of a trivalent G-quadruplex/hemin DNAzyme for colorimetric detection of Hg^(2+).A hairpin DNA(Hr)was designed with thymine-Hg^(2+)-thymine pairs that catalyzed by Exo III is prompted to happen upon binding Hg^(2+).A released DNA fragment triggers the catalytic assembly of other three hairpins(H1,H2,and H3)to form many trivalent G-quadruplex/hemin DNA enzymes for signal output.The developed sensor shows a dynamic range from 2 pM to 2μM,with an impressively low detection limit of 0.32 pM for Hg^(2+)detection.Such a sensor also has good selectivity toward Hg^(2+)detection in the presence of other common metal ions.This strategy shows the great potential for visual detection with portable type.展开更多
使用含有偕胺肟基团的改性聚丙烯腈(PAN)纤维作为载体材料,通过轴向配位作用负载氯化血红素(hemin)制备了非均相催化剂hemin-PAN,重点对其在有机染料氧化降解反应中的催化性能进行研究。结果表明,hemin-PAN能够通过活化H2O2催化染料的...使用含有偕胺肟基团的改性聚丙烯腈(PAN)纤维作为载体材料,通过轴向配位作用负载氯化血红素(hemin)制备了非均相催化剂hemin-PAN,重点对其在有机染料氧化降解反应中的催化性能进行研究。结果表明,hemin-PAN能够通过活化H2O2催化染料的氧化降解反应,其催化活性与纤维中偕胺肟基团数量密切相关,PAN增重率为14.9%时,hemin-PAN有最高的催化活性;增加催化剂hemin负载量或提高反应温度都有利于染料的氧化降解反应,hemin-PAN(增重率为14.9%,hemin负载量为0.026 mmol/g)催化罗丹明B染料氧化降解反应的活化能为63.83 k J/mol。展开更多
Summary: The role of HO-1 inducer, hemin, in chronic renal failure (CRF) rats and its possible mechanism of action was studied. 5/6 subtotal nephrectomy was performed to establish chronic renal failure model. Rats wer...Summary: The role of HO-1 inducer, hemin, in chronic renal failure (CRF) rats and its possible mechanism of action was studied. 5/6 subtotal nephrectomy was performed to establish chronic renal failure model. Rats were randomly assigned to 4 groups: sham-operated group, CRF group, ferrous gluconate group and hemin group. At the 10th week after operation, serum creatinine, BUN, RBC, HGB and HCT were measured. Renal pathologic changes were observed. RT-PCR and immunohistochemistry were used to detect the expression and distribution of HO-1. RT-PCR and radioimmunoassay was used to determine the expression of ET-1 in the kidney and plasma. The results showed that as compared with CRF group, serum creatinine and BUN in hemin group were reduced significantly and nephrogenic anemia was improved markedly. Glomerular mesangial proliferation and interstitial lesion were also ameliorated significantly. Hemin not only increased the expression of HO-1 but also reduced the expression of ET-1 in the kidney. The level of ET-1 protein in the plasma was also reduced after hemin treatment. Most of these indexes were not obviously changed in ferrous gluconate group. It was suggested that through inducing the expression of HO-1 and reducing the level of ET-1 in the kidney and plasma, hemin plays an important protective role in 5/6 subtotal nephrectomized rats.展开更多
Objective:To explore antischitosome effects of artemether,hemin and Fe on S/LDH.Methods: Enzyme activity of rS/LDH was assayed in the standard reaction system by adding different concentration of reagents(0.00-0.10 mM...Objective:To explore antischitosome effects of artemether,hemin and Fe on S/LDH.Methods: Enzyme activity of rS/LDH was assayed in the standard reaction system by adding different concentration of reagents(0.00-0.10 mM artemether,0.00-0.02 mM hemin,0.00-0.50 mM Fe^(3+)). Same solvents of the each reagent were used as control.Results:There was no enzyme activity inhibition observed at 0.10 mM artemther:obivious inhibition for lactate oxidation reaction and pyruvate reduction reaction were detected at 0.002 mM and 0.004 mM of hemin,respectively: comparing with that of the control(P<0.05).The relative enzymatic activity inhibitions for pyruvate reduction reaction and lactate oxidation reaction at 0.02 mM hemin were 93.48%and 100.00%,respectively,comparing with that of the control(P<0.01):both pyruvate reduction and lactate oxidation reaction were inhibited completely at 0.50 mM Fe^(3+),comparing with that of the control(P<0.01).Conclusions:The results implied that SjLDH was not the direct molecular target of artemether.Hemin and Fe are inhibitors of SjLDH.展开更多
BACKGROUND： Despite a large amount of resuscitation research, the survival rate after cardiac arrest remains low, and brain injury is the key issue. Neuroglobin （NGB） is an oxygen-binding heme protein found in the...BACKGROUND： Despite a large amount of resuscitation research, the survival rate after cardiac arrest remains low, and brain injury is the key issue. Neuroglobin （NGB） is an oxygen-binding heme protein found in the brain with a protection role against ischemic-hypoxic brain injury. Hemin is an effective activator of neuroglobin. This study was undertaken to assess the effect of hemin on expression of neuroglobin （NGB） in the cerebral cortex, neuro-defi cit score （NDS） and pathological changes after cardiopulmonary resuscitation （CPR） in rats.METHODS： A total of 120 male Sprague-Dawley （SD） rats were randomly divided into a control group （A）, a CPR group （B） and a Hemin group （C）. The animal model of cardiac arrest （CA） induced by asphyxia and CPR was established. NGB expression in the cerebral cortex with immunohistochemistry, NDS and pathological changes in the cerebral cortex were examined at 3, 6, 12, 24 hours after recovery of spontaneous circulation （ROSC） in each group. Experimental data were treated as one-factor analysis of variance and the Tukey test.RESULTS： In comparison with group A, NGB expression was increased signifi cantly at 12 and 24 hours after ROSC （P〈0.05 or P〈0.01）, NDS was decreased signifi cantly at each time point after ROSC （P〈0.01）, and pathological changes were severe at each time point after ROSC in group B. In comparison with group A, NGB expression was increased signifi cantly at 6, 12, 24 hours after ROSC （P〈0.05 or P〈0.01）, NDS was decreased signifi cantly at 3, 6, 12 hours after ROSC （P〈0.01） in group C. In comparison with group B, NGB expression was increased signifi cantly at 12 and 24 hours after ROSC, NDS was increased signifi cantly at 12 and 24 hours after ROSC, and pathological changes were milder in group C.CONCLUSION： There were increased NGB expression in the cerebral cortex, decreased NDS, and severe pathological changes after CPR in rats. Hemin treatment up-regulated expression of NGB, improved NDS, mitigated pathological changes, and alleviated cerebral injury after CPR.展开更多
Degradation of dyes is an important environmental issue. In order to avoid the carcinogenic risks in anaerobic-aerobic biological process for wastewater containing azo dyes, a hemin based biomimetic oxidative degradat...Degradation of dyes is an important environmental issue. In order to avoid the carcinogenic risks in anaerobic-aerobic biological process for wastewater containing azo dyes, a hemin based biomimetic oxidative degradation of azo dyes was developed. Acid orange 7 (AO7) was selected as the model for azo dye and the high efficient degradation was achieved in hemin/H2O2 system at pH 11.0. Degradation could be described by a pseudo-first-order kinetic model. The order of dependence on H2O2 concentration was significantly larger than that of hemin. Coexisting anions sulphate and chloride had little effect on the degradation, but reductive sulphite dramatically inhibited the degradation. The protic solvent 2-prophanol obviously promoted the degradation. Azo chromogenic group was destroyed quickly and some smaller intermediates formed. Active species oxoferryl porphyrin p-cation radical +PFeIV=O generated from heterolytic cleavage of O-O in H2O2 catalyzed by hemin play the main roles in degradation and reaction pathways were proposed.展开更多
基金Supported by The Science and Technology Project of General Administration of Quality Supervision,Inspection and Quarantine (2015IK126)The Science and Technology Project of Changsha City of Hunan Province of China (KQ1602124).
文摘Mercury ion(Hg^(2+)),a highly noxious of heavy metalion,has detrimental effects on the ecological environment and human health.Herein,we have developed an exonuclease III(Exo III)assisted catalytic hairpin assembly formation of a trivalent G-quadruplex/hemin DNAzyme for colorimetric detection of Hg^(2+).A hairpin DNA(Hr)was designed with thymine-Hg^(2+)-thymine pairs that catalyzed by Exo III is prompted to happen upon binding Hg^(2+).A released DNA fragment triggers the catalytic assembly of other three hairpins(H1,H2,and H3)to form many trivalent G-quadruplex/hemin DNA enzymes for signal output.The developed sensor shows a dynamic range from 2 pM to 2μM,with an impressively low detection limit of 0.32 pM for Hg^(2+)detection.Such a sensor also has good selectivity toward Hg^(2+)detection in the presence of other common metal ions.This strategy shows the great potential for visual detection with portable type.
文摘使用含有偕胺肟基团的改性聚丙烯腈(PAN)纤维作为载体材料,通过轴向配位作用负载氯化血红素(hemin)制备了非均相催化剂hemin-PAN,重点对其在有机染料氧化降解反应中的催化性能进行研究。结果表明,hemin-PAN能够通过活化H2O2催化染料的氧化降解反应,其催化活性与纤维中偕胺肟基团数量密切相关,PAN增重率为14.9%时,hemin-PAN有最高的催化活性;增加催化剂hemin负载量或提高反应温度都有利于染料的氧化降解反应,hemin-PAN(增重率为14.9%,hemin负载量为0.026 mmol/g)催化罗丹明B染料氧化降解反应的活化能为63.83 k J/mol。
文摘Summary: The role of HO-1 inducer, hemin, in chronic renal failure (CRF) rats and its possible mechanism of action was studied. 5/6 subtotal nephrectomy was performed to establish chronic renal failure model. Rats were randomly assigned to 4 groups: sham-operated group, CRF group, ferrous gluconate group and hemin group. At the 10th week after operation, serum creatinine, BUN, RBC, HGB and HCT were measured. Renal pathologic changes were observed. RT-PCR and immunohistochemistry were used to detect the expression and distribution of HO-1. RT-PCR and radioimmunoassay was used to determine the expression of ET-1 in the kidney and plasma. The results showed that as compared with CRF group, serum creatinine and BUN in hemin group were reduced significantly and nephrogenic anemia was improved markedly. Glomerular mesangial proliferation and interstitial lesion were also ameliorated significantly. Hemin not only increased the expression of HO-1 but also reduced the expression of ET-1 in the kidney. The level of ET-1 protein in the plasma was also reduced after hemin treatment. Most of these indexes were not obviously changed in ferrous gluconate group. It was suggested that through inducing the expression of HO-1 and reducing the level of ET-1 in the kidney and plasma, hemin plays an important protective role in 5/6 subtotal nephrectomized rats.
基金Supported by National Nature Science Fundation of China(No. 30860070)
文摘Objective:To explore antischitosome effects of artemether,hemin and Fe on S/LDH.Methods: Enzyme activity of rS/LDH was assayed in the standard reaction system by adding different concentration of reagents(0.00-0.10 mM artemether,0.00-0.02 mM hemin,0.00-0.50 mM Fe^(3+)). Same solvents of the each reagent were used as control.Results:There was no enzyme activity inhibition observed at 0.10 mM artemther:obivious inhibition for lactate oxidation reaction and pyruvate reduction reaction were detected at 0.002 mM and 0.004 mM of hemin,respectively: comparing with that of the control(P<0.05).The relative enzymatic activity inhibitions for pyruvate reduction reaction and lactate oxidation reaction at 0.02 mM hemin were 93.48%and 100.00%,respectively,comparing with that of the control(P<0.01):both pyruvate reduction and lactate oxidation reaction were inhibited completely at 0.50 mM Fe^(3+),comparing with that of the control(P<0.01).Conclusions:The results implied that SjLDH was not the direct molecular target of artemether.Hemin and Fe are inhibitors of SjLDH.
文摘BACKGROUND： Despite a large amount of resuscitation research, the survival rate after cardiac arrest remains low, and brain injury is the key issue. Neuroglobin （NGB） is an oxygen-binding heme protein found in the brain with a protection role against ischemic-hypoxic brain injury. Hemin is an effective activator of neuroglobin. This study was undertaken to assess the effect of hemin on expression of neuroglobin （NGB） in the cerebral cortex, neuro-defi cit score （NDS） and pathological changes after cardiopulmonary resuscitation （CPR） in rats.METHODS： A total of 120 male Sprague-Dawley （SD） rats were randomly divided into a control group （A）, a CPR group （B） and a Hemin group （C）. The animal model of cardiac arrest （CA） induced by asphyxia and CPR was established. NGB expression in the cerebral cortex with immunohistochemistry, NDS and pathological changes in the cerebral cortex were examined at 3, 6, 12, 24 hours after recovery of spontaneous circulation （ROSC） in each group. Experimental data were treated as one-factor analysis of variance and the Tukey test.RESULTS： In comparison with group A, NGB expression was increased signifi cantly at 12 and 24 hours after ROSC （P〈0.05 or P〈0.01）, NDS was decreased signifi cantly at each time point after ROSC （P〈0.01）, and pathological changes were severe at each time point after ROSC in group B. In comparison with group A, NGB expression was increased signifi cantly at 6, 12, 24 hours after ROSC （P〈0.05 or P〈0.01）, NDS was decreased signifi cantly at 3, 6, 12 hours after ROSC （P〈0.01） in group C. In comparison with group B, NGB expression was increased signifi cantly at 12 and 24 hours after ROSC, NDS was increased signifi cantly at 12 and 24 hours after ROSC, and pathological changes were milder in group C.CONCLUSION： There were increased NGB expression in the cerebral cortex, decreased NDS, and severe pathological changes after CPR in rats. Hemin treatment up-regulated expression of NGB, improved NDS, mitigated pathological changes, and alleviated cerebral injury after CPR.
文摘Degradation of dyes is an important environmental issue. In order to avoid the carcinogenic risks in anaerobic-aerobic biological process for wastewater containing azo dyes, a hemin based biomimetic oxidative degradation of azo dyes was developed. Acid orange 7 (AO7) was selected as the model for azo dye and the high efficient degradation was achieved in hemin/H2O2 system at pH 11.0. Degradation could be described by a pseudo-first-order kinetic model. The order of dependence on H2O2 concentration was significantly larger than that of hemin. Coexisting anions sulphate and chloride had little effect on the degradation, but reductive sulphite dramatically inhibited the degradation. The protic solvent 2-prophanol obviously promoted the degradation. Azo chromogenic group was destroyed quickly and some smaller intermediates formed. Active species oxoferryl porphyrin p-cation radical +PFeIV=O generated from heterolytic cleavage of O-O in H2O2 catalyzed by hemin play the main roles in degradation and reaction pathways were proposed.
