Objective:To investigate the effects of tripterygium glycosides combined with compoundα-ketoacid tablets on inflammatory response, oxidative stress and urinary TGF-β1 and IV-C levels in patients with chronic renal f...Objective:To investigate the effects of tripterygium glycosides combined with compoundα-ketoacid tablets on inflammatory response, oxidative stress and urinary TGF-β1 and IV-C levels in patients with chronic renal failure.Methods: 102 patients with chronic renal failure admitted to Shuguang hospital from January 2017 to June 2018 were randomly divided into observation group (51 cases) and control group (51 cases). In the control group, the tripterygium glycosides tablets were orally administered, and the observation group was orally administered with tripterygium glycosides tablets and compoundα-keto acid tablets. The inflammatory response, oxidative stress index and urinary TGF-β1, IV-C levels were compared between the two groups.Results: There was no significant difference in CRP and TNF-α levels between the two groups before treatment (P>0.05). After treatment, the levels of CRP and TNF-α in the observation group were (9.32±1.10) mg/L and (3.14±0.36) ng/L, respectively, and the levels of CRP and TNF-α in the control group were (15.34±1.31) mg/ L, (5.01±0.53) ng / L. The CRP and TNF-α levels in the two groups were lower than those before treatment, and the CRP and TNF-α in the observation group were significantly lower than those in the control group (P<0.05). Before treatment, there was no significant difference in MDA, SOD and GSH-PX levels between the two groups (P>0.05). After treatment, the MDA level of the observation group was (3.01±0.32) μmol/L, and the MDA level of the control group was (5.17±0.61) μmol/L. The MDA of the two groups was lower than that before treatment, and the MDA of the observation group was significantly lower than that of the control group (P<0.05). After treatment, the levels of SOD and GSH-PX in the observation group were (101.45±13.16) U/L and (94.83±7.17) U/L, respectively. The levels of SOD and GSH-PX in the control group were (88.87±12.05) U/L, (87.38 ± 6.32) U/L. The SOD and GSH-PX of the two groups were higher than those before treatment, and the SOD and GSH-PX of the observation group were significantly higher than the control group (P<0.05). Before treatment, there was no significant difference in TGF-β1 and IV-C levels between the two groups (P>0.05). After treatment, the levels of TGF-β1 and IV-C in the observation group were (1.05±0.24) ng/L and (5.05±1.13) μg/L, respectively, and the levels of TGF-β1 and IV-C in the control group were (1.36±, respectively). 0.26) ng/L, (7.07±1.24) μg/L. The levels of TGF-β1 and IV-C in the two groups were lower than those before treatment, and the TGF-β1 and IV-C in the observation group were significantly lower than those in the control group (P<0.05).Conclusion: Tripterygium glycosides combined with compound -keto acid tablets can effectively reduce the inflammatory response, oxidative stress and renal interstitial fibrosis in patients with chronic renal failure.展开更多
Lactococcus lactis is an important food-grade microorganism that has been successfully applied as a starter to increase the level of 3-methylbutanal produced during the ripening of cheese.Three variants of branched-ch...Lactococcus lactis is an important food-grade microorganism that has been successfully applied as a starter to increase the level of 3-methylbutanal produced during the ripening of cheese.Three variants of branched-chain α-keto acid decarboxylase (KADC) were discovered in L.lactis strains with different 3-methylbutanal production abilities.Three genes encoding KADCs of varying lengths (KADC-long,KADC-middle,and KADC-short) were cloned and heterologously expressed into Escherichia coli.KADC activity was only detected in the E.coli cloned with the KADC-long-encoding gene.Homology modeling of the three KADC recombination proteins showed that an active-site residue (Glu462) and an S-pocket structure were necessary for the ability to catalyze substrates.KADC-long showed maximum activity at pH 7.0 and 30 ℃.The substrate hydrolysis and kinetic parameters demonstrated that KADC-long efficiently produces 2-methylbutanal and 3-methylbutanal.The heterologous expression of the full-length kdcA in low-3-methylbutanal-yield L.lactis strains increased their production yields.The results of this study demonstrate the function of the complete KADC in 3-methylbutanal production.展开更多
As a kind of environmentally benign reagents,α-keto acids have been extensively employed as key starting materials in organic synthesis.Organic electrosynthesis has the advantages of reducing byproduct generation,imp...As a kind of environmentally benign reagents,α-keto acids have been extensively employed as key starting materials in organic synthesis.Organic electrosynthesis has the advantages of reducing byproduct generation,improving the cost-efficiency of synthetic processes,and accessing reactive intermediates under mild conditions.Inspired by the merits of organic electrosynthesis,α-keto acids have shown many synthetic applications in electrochemical acylation,cyclization,and reductive amination reactions with improved efficiencies and selectivities.This review covers the recent breakthroughs achieved in the electrochemical transformations ofα-keto acids,aimed at highlighting these electrochemical reactions’features and mechanistic rationalisations.Meanwhile,the practicalities and limitations of these transformations are also presented where possible.展开更多
High current findings indicate that a substitution with pyruvate can lead to significant alterations or even improvement in neutrophil immunonutrition. However, it is still unknown which intra-cellular pathways might ...High current findings indicate that a substitution with pyruvate can lead to significant alterations or even improvement in neutrophil immunonutrition. However, it is still unknown which intra-cellular pathways might be involved here. Hence, in this study, we investigated whether preincu-bation with an inhibitor of ·NO-synthase (L-NAME), an ·NO donor (SNAP), an analogue of taurine (beta-alanine), an inhibitor of ornithine-decarboxylase (DFMO) as well as a glutamine-analogue (DON), is able to alter the intragranulocytic metabolic response to pyruvate, here for example studied for neutrophil intracellular amino- and α-keto acid concentrations or important neutrophil immune functions [released myeloperoxidase (MPO), the formation of superoxide anions O2- and hydrogen peroxide (H2O2)]. In summary, the interesting first results presented here showed, that any damage of specific metabolic pathways or mechanisms, which seem directly or indirectly to be involved in relevant pyruvate dependent granulocytic nutrient content or specific cellular tasks, could lead to therapeutically desired, but also to unexpected or even fatal consequences for the affected cells. We therefore continue to believe that pyruvate, irrespective of which exact biochemical mechanisms were involved, in neutrophils may satisfy the substantial metabolic demands for a potent intracellular nutrient.展开更多
文摘Objective:To investigate the effects of tripterygium glycosides combined with compoundα-ketoacid tablets on inflammatory response, oxidative stress and urinary TGF-β1 and IV-C levels in patients with chronic renal failure.Methods: 102 patients with chronic renal failure admitted to Shuguang hospital from January 2017 to June 2018 were randomly divided into observation group (51 cases) and control group (51 cases). In the control group, the tripterygium glycosides tablets were orally administered, and the observation group was orally administered with tripterygium glycosides tablets and compoundα-keto acid tablets. The inflammatory response, oxidative stress index and urinary TGF-β1, IV-C levels were compared between the two groups.Results: There was no significant difference in CRP and TNF-α levels between the two groups before treatment (P>0.05). After treatment, the levels of CRP and TNF-α in the observation group were (9.32±1.10) mg/L and (3.14±0.36) ng/L, respectively, and the levels of CRP and TNF-α in the control group were (15.34±1.31) mg/ L, (5.01±0.53) ng / L. The CRP and TNF-α levels in the two groups were lower than those before treatment, and the CRP and TNF-α in the observation group were significantly lower than those in the control group (P<0.05). Before treatment, there was no significant difference in MDA, SOD and GSH-PX levels between the two groups (P>0.05). After treatment, the MDA level of the observation group was (3.01±0.32) μmol/L, and the MDA level of the control group was (5.17±0.61) μmol/L. The MDA of the two groups was lower than that before treatment, and the MDA of the observation group was significantly lower than that of the control group (P<0.05). After treatment, the levels of SOD and GSH-PX in the observation group were (101.45±13.16) U/L and (94.83±7.17) U/L, respectively. The levels of SOD and GSH-PX in the control group were (88.87±12.05) U/L, (87.38 ± 6.32) U/L. The SOD and GSH-PX of the two groups were higher than those before treatment, and the SOD and GSH-PX of the observation group were significantly higher than the control group (P<0.05). Before treatment, there was no significant difference in TGF-β1 and IV-C levels between the two groups (P>0.05). After treatment, the levels of TGF-β1 and IV-C in the observation group were (1.05±0.24) ng/L and (5.05±1.13) μg/L, respectively, and the levels of TGF-β1 and IV-C in the control group were (1.36±, respectively). 0.26) ng/L, (7.07±1.24) μg/L. The levels of TGF-β1 and IV-C in the two groups were lower than those before treatment, and the TGF-β1 and IV-C in the observation group were significantly lower than those in the control group (P<0.05).Conclusion: Tripterygium glycosides combined with compound -keto acid tablets can effectively reduce the inflammatory response, oxidative stress and renal interstitial fibrosis in patients with chronic renal failure.
基金supported by the National Natural Science Foundation of China(No.31972197).
文摘Lactococcus lactis is an important food-grade microorganism that has been successfully applied as a starter to increase the level of 3-methylbutanal produced during the ripening of cheese.Three variants of branched-chain α-keto acid decarboxylase (KADC) were discovered in L.lactis strains with different 3-methylbutanal production abilities.Three genes encoding KADCs of varying lengths (KADC-long,KADC-middle,and KADC-short) were cloned and heterologously expressed into Escherichia coli.KADC activity was only detected in the E.coli cloned with the KADC-long-encoding gene.Homology modeling of the three KADC recombination proteins showed that an active-site residue (Glu462) and an S-pocket structure were necessary for the ability to catalyze substrates.KADC-long showed maximum activity at pH 7.0 and 30 ℃.The substrate hydrolysis and kinetic parameters demonstrated that KADC-long efficiently produces 2-methylbutanal and 3-methylbutanal.The heterologous expression of the full-length kdcA in low-3-methylbutanal-yield L.lactis strains increased their production yields.The results of this study demonstrate the function of the complete KADC in 3-methylbutanal production.
基金the National Natural Science Foundation of China(No.21702113)the Thousand Talents Plan of Central PlainsBeijing Municipal Education Committee Project(No.KM202110005006)。
文摘As a kind of environmentally benign reagents,α-keto acids have been extensively employed as key starting materials in organic synthesis.Organic electrosynthesis has the advantages of reducing byproduct generation,improving the cost-efficiency of synthetic processes,and accessing reactive intermediates under mild conditions.Inspired by the merits of organic electrosynthesis,α-keto acids have shown many synthetic applications in electrochemical acylation,cyclization,and reductive amination reactions with improved efficiencies and selectivities.This review covers the recent breakthroughs achieved in the electrochemical transformations ofα-keto acids,aimed at highlighting these electrochemical reactions’features and mechanistic rationalisations.Meanwhile,the practicalities and limitations of these transformations are also presented where possible.
文摘High current findings indicate that a substitution with pyruvate can lead to significant alterations or even improvement in neutrophil immunonutrition. However, it is still unknown which intra-cellular pathways might be involved here. Hence, in this study, we investigated whether preincu-bation with an inhibitor of ·NO-synthase (L-NAME), an ·NO donor (SNAP), an analogue of taurine (beta-alanine), an inhibitor of ornithine-decarboxylase (DFMO) as well as a glutamine-analogue (DON), is able to alter the intragranulocytic metabolic response to pyruvate, here for example studied for neutrophil intracellular amino- and α-keto acid concentrations or important neutrophil immune functions [released myeloperoxidase (MPO), the formation of superoxide anions O2- and hydrogen peroxide (H2O2)]. In summary, the interesting first results presented here showed, that any damage of specific metabolic pathways or mechanisms, which seem directly or indirectly to be involved in relevant pyruvate dependent granulocytic nutrient content or specific cellular tasks, could lead to therapeutically desired, but also to unexpected or even fatal consequences for the affected cells. We therefore continue to believe that pyruvate, irrespective of which exact biochemical mechanisms were involved, in neutrophils may satisfy the substantial metabolic demands for a potent intracellular nutrient.
