Background:Arthrofibrosis is a joint disorder characterized by excessive scar formation in the joint tissues.Vitamin E is an antioxidant with potential anti-fibroblastic effect.The aim of this study was to establish a...Background:Arthrofibrosis is a joint disorder characterized by excessive scar formation in the joint tissues.Vitamin E is an antioxidant with potential anti-fibroblastic effect.The aim of this study was to establish an arthrofibrosis rat model after joint replacement and assess the effects of vitamin E supplementation on joint fibrosis.Methods:We simulated knee replacement in 16 male Sprague–Dawley rats.We immobilized the surgical leg with a suture in full flexion.The control groups were killed at 2 and 12 weeks(n=5 per group),and the test group was supplemented daily with vitamin E(0.2 mg/mL)in their drinking water for 12 weeks(n=6).We performed histological staining to investigate the presence and severity of arthrofibrosis.Immunofluorescent staining andα2-macroglobulin(α2M)enzyme-linked immunosorbent assay(ELISA)were used to assess local and systemic inflammation.Static weight bearing(total internal reflection)and range of motion(ROM)were collected for functional assessment.Results:The ROM and weight-bearing symmetry decreased after the procedure and recovered slowly with still significant deficit at the end of the study for both groups.Histological analysis confirmed fibrosis in both lateral and posterior periarticular tissue.Vitamin E supplementation showed a moderate anti-inflammatory effect on the local and systemic levels.The vitamin E group exhibited significant improvement in ROM and weight-bearing symmetry at day 84 compared to the control group.Conclusions:This model is viable for simulating arthrofibrosis after joint replacement.Vitamin E may benefit postsurgical arthrofibrosis,and further studies are needed for dosing requirements.展开更多
Pancreatic cancer is the leading cause of cancer mortality worldwide.Research investigating effective management strategies for pancreatic cancer is ongoing.Vitamin E,consisting of both tocopherol and tocotrienol,has ...Pancreatic cancer is the leading cause of cancer mortality worldwide.Research investigating effective management strategies for pancreatic cancer is ongoing.Vitamin E,consisting of both tocopherol and tocotrienol,has demonstrated debatable effects on pancreatic cancer cells.Therefore,this scoping review aims to summarize the effects of vitamin E on pancreatic cancer.In October 2022,a literature search was conducted using PubMed and Scopus since their inception.Original studies on the effects of vitamin E on pancreatic cancer,including cell cultures,animal models and human clinical trials,were considered for this review.The literature search found 75 articles on this topic,but only 24 articles met the inclusion criteria.The available evidence showed that vitamin E modulated proliferation,cell death,angiogenesis,metastasis and inflammation in pancreatic cancer cells.However,the safety and bioavailability concerns remain to be answered with more extensive preclinical and clinical studies.More in-depth analysis is necessary to investigate further the role of vitamin E in the management of pancreatic cancers.展开更多
A simple and sensitive flow injection spectrophotometric method is reported for the determination of vitamin E using potassium ferricyanide-Fe(Ⅲ) detection system.In the presence of vitamin E,Fe(Ⅲ)/ferricyanide redu...A simple and sensitive flow injection spectrophotometric method is reported for the determination of vitamin E using potassium ferricyanide-Fe(Ⅲ) detection system.In the presence of vitamin E,Fe(Ⅲ)/ferricyanide reduces.The in situ reduced ions are then reacted with unreduced portion of ferricyanide/Fe(Ⅲ) to make soluble Prussian blue,which is monitored at absorption wavelength of 735 nm.Linear calibration graph was obtained in the concentration range of 0.1-40μg mL^(-1).The relative standard deviations (n=4) were in the range of 1.1-3.6%,with limits of detection(3 s blank) of 0.04μg mL^(-1).The proposed method allowed 12 injections h^(-1).The method is applied to determine vitamin E in pharmaceuticals,infant milk and blood serum samples using hexane extraction with the recoveries in the range of 93±3 to 97.5±4%.The method is validated using certified reference materials SRM 968c for blood serum samples.展开更多
目的:评价补充不同维生素对预防早产儿支气管肺发育不良(BPD)的疗效。方法:检索中国知网(CNKI)、万方(Wan fang)、维普网(cqvip)、PubMed、Cochrane Library、Web of Science数据库,纳入关于补充维生素预防早产儿BPD的随机对照试验(RCT...目的:评价补充不同维生素对预防早产儿支气管肺发育不良(BPD)的疗效。方法:检索中国知网(CNKI)、万方(Wan fang)、维普网(cqvip)、PubMed、Cochrane Library、Web of Science数据库,纳入关于补充维生素预防早产儿BPD的随机对照试验(RCTs),筛选符合纳入标准的RCTs,运用Cochrane偏倚风险评估工具进行文献质量评价,通过贝叶斯网状meta分析,分析比较不同维生素预防BPD的疗效。结果:共纳入21篇RCTs,(3188例早产儿)。与安慰剂组相比,中等剂量补充维生素D(400~800IU/d,OR=0.41,95%Cl[0.18,0.90])、小剂量补充维生素A(<1333IU/kg/d,OR=0.50,95%Cl[0.25,0.95])与BPD发生率降低相关。小剂量补充维生素D(<400IU/d,OR=12.36,95%Cl[1.00,600.21])可能与早产儿死亡率增加相关。小剂量补充维生素E(OR=0.59,95%Cl[0.23,1.36]),大剂量补充维生素E(OR=0.74,95%Cl[0.14,3.64])置信区间较宽,2项与预防早产儿BPD关系不大。结论:补充中等剂量维生素D、小剂量维生素A可有效预防早产儿BPD发生。小剂量补充维生素D可能增加早产儿死亡率,提示早产儿补充维生素D时应予足量补充。目前尚未充分证实维生素E在预防BPD方面的有效性。展开更多
We described a novel polymer-lipase conjugate for high-efficient esterification of vitamin E using vitamin E and succinic anhydride as the substrates in nonaqueous media.In this work,the monomer,N-isopropylacrylamide(...We described a novel polymer-lipase conjugate for high-efficient esterification of vitamin E using vitamin E and succinic anhydride as the substrates in nonaqueous media.In this work,the monomer,N-isopropylacrylamide(NIPAM),was grafted onto Candida rugosa lipase(CRL)to synthesize poly(NIPAM)(pNIPAM)-CRL conjugate by atom transfer radical polymerization via the initiator coupled on the surface of CRL.The result showed that the catalytic efficiencies of pNIPAM-CRL conjugates(19.5-30.3 L·s^(-1)·mmol^(-1))were at least 7 times higher than that of free CRL(2.36 L·s^(-1)·mmol^(-1))in DMSO.It was attributed to a significant increase in Kcat of the conjugates in nonaqueous media.The synthesis catalyzed by pNIPAM-CRL co njugates was influenced by the length and density of the grafted polymer,water content,solvent polarity and molar ratio of the substrates.In the optimal synthesis,the reaction time was shortened at least 7 times,and yields of vitamin E succinate by pNIPAM-g-CRL and free CRL were obtained to be 75.4%and 6.6%at 55℃after the reaction for 1.5 h.The result argued that conjugation with pNIPAM induced conformational change of the lid on CRL based on hydrophobic interaction,thus providing a higher possibility of catalysis-favorable conformation on CRL in nonaqueous media.Moreover,pNIPAM conjugation improved the thermal stability of CRL greatly,and the stability improved further with an increase of chain length of pNIPAM.At the optimal reaction conditions(55℃and 1.5 h),pNIPAM-g-CRL also exhibited good reusability in the enzymatic synthesis of vitamin E succinate and kept~70%of its catalytic activity after ten consecutive cycles.The research demonstrated that pNIPAM-g-CRL was a more competitive biocatalyst in the enzymatic synthesis of vitamin E succinate and exhibited good application potential under harsh industrial conditions.展开更多
基金supported in part by the Ruth Jackson Orthopedic Society and the Harris Orthopedic Laboratoryapproved by the Institutional Care and Use Committee of Massachusetts General Hospital(2020N000081)。
文摘Background:Arthrofibrosis is a joint disorder characterized by excessive scar formation in the joint tissues.Vitamin E is an antioxidant with potential anti-fibroblastic effect.The aim of this study was to establish an arthrofibrosis rat model after joint replacement and assess the effects of vitamin E supplementation on joint fibrosis.Methods:We simulated knee replacement in 16 male Sprague–Dawley rats.We immobilized the surgical leg with a suture in full flexion.The control groups were killed at 2 and 12 weeks(n=5 per group),and the test group was supplemented daily with vitamin E(0.2 mg/mL)in their drinking water for 12 weeks(n=6).We performed histological staining to investigate the presence and severity of arthrofibrosis.Immunofluorescent staining andα2-macroglobulin(α2M)enzyme-linked immunosorbent assay(ELISA)were used to assess local and systemic inflammation.Static weight bearing(total internal reflection)and range of motion(ROM)were collected for functional assessment.Results:The ROM and weight-bearing symmetry decreased after the procedure and recovered slowly with still significant deficit at the end of the study for both groups.Histological analysis confirmed fibrosis in both lateral and posterior periarticular tissue.Vitamin E supplementation showed a moderate anti-inflammatory effect on the local and systemic levels.The vitamin E group exhibited significant improvement in ROM and weight-bearing symmetry at day 84 compared to the control group.Conclusions:This model is viable for simulating arthrofibrosis after joint replacement.Vitamin E may benefit postsurgical arthrofibrosis,and further studies are needed for dosing requirements.
文摘Pancreatic cancer is the leading cause of cancer mortality worldwide.Research investigating effective management strategies for pancreatic cancer is ongoing.Vitamin E,consisting of both tocopherol and tocotrienol,has demonstrated debatable effects on pancreatic cancer cells.Therefore,this scoping review aims to summarize the effects of vitamin E on pancreatic cancer.In October 2022,a literature search was conducted using PubMed and Scopus since their inception.Original studies on the effects of vitamin E on pancreatic cancer,including cell cultures,animal models and human clinical trials,were considered for this review.The literature search found 75 articles on this topic,but only 24 articles met the inclusion criteria.The available evidence showed that vitamin E modulated proliferation,cell death,angiogenesis,metastasis and inflammation in pancreatic cancer cells.However,the safety and bioavailability concerns remain to be answered with more extensive preclinical and clinical studies.More in-depth analysis is necessary to investigate further the role of vitamin E in the management of pancreatic cancers.
文摘A simple and sensitive flow injection spectrophotometric method is reported for the determination of vitamin E using potassium ferricyanide-Fe(Ⅲ) detection system.In the presence of vitamin E,Fe(Ⅲ)/ferricyanide reduces.The in situ reduced ions are then reacted with unreduced portion of ferricyanide/Fe(Ⅲ) to make soluble Prussian blue,which is monitored at absorption wavelength of 735 nm.Linear calibration graph was obtained in the concentration range of 0.1-40μg mL^(-1).The relative standard deviations (n=4) were in the range of 1.1-3.6%,with limits of detection(3 s blank) of 0.04μg mL^(-1).The proposed method allowed 12 injections h^(-1).The method is applied to determine vitamin E in pharmaceuticals,infant milk and blood serum samples using hexane extraction with the recoveries in the range of 93±3 to 97.5±4%.The method is validated using certified reference materials SRM 968c for blood serum samples.
文摘目的:评价补充不同维生素对预防早产儿支气管肺发育不良(BPD)的疗效。方法:检索中国知网(CNKI)、万方(Wan fang)、维普网(cqvip)、PubMed、Cochrane Library、Web of Science数据库,纳入关于补充维生素预防早产儿BPD的随机对照试验(RCTs),筛选符合纳入标准的RCTs,运用Cochrane偏倚风险评估工具进行文献质量评价,通过贝叶斯网状meta分析,分析比较不同维生素预防BPD的疗效。结果:共纳入21篇RCTs,(3188例早产儿)。与安慰剂组相比,中等剂量补充维生素D(400~800IU/d,OR=0.41,95%Cl[0.18,0.90])、小剂量补充维生素A(<1333IU/kg/d,OR=0.50,95%Cl[0.25,0.95])与BPD发生率降低相关。小剂量补充维生素D(<400IU/d,OR=12.36,95%Cl[1.00,600.21])可能与早产儿死亡率增加相关。小剂量补充维生素E(OR=0.59,95%Cl[0.23,1.36]),大剂量补充维生素E(OR=0.74,95%Cl[0.14,3.64])置信区间较宽,2项与预防早产儿BPD关系不大。结论:补充中等剂量维生素D、小剂量维生素A可有效预防早产儿BPD发生。小剂量补充维生素D可能增加早产儿死亡率,提示早产儿补充维生素D时应予足量补充。目前尚未充分证实维生素E在预防BPD方面的有效性。
基金financially supported by the National Key Research and Development Program of China (2021YFC2102801)National Natural Science Foundation of China (21878221)+1 种基金the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (21621004)the Haihe Laboratory of Sustainable Chemical Transformations for financial support.
文摘We described a novel polymer-lipase conjugate for high-efficient esterification of vitamin E using vitamin E and succinic anhydride as the substrates in nonaqueous media.In this work,the monomer,N-isopropylacrylamide(NIPAM),was grafted onto Candida rugosa lipase(CRL)to synthesize poly(NIPAM)(pNIPAM)-CRL conjugate by atom transfer radical polymerization via the initiator coupled on the surface of CRL.The result showed that the catalytic efficiencies of pNIPAM-CRL conjugates(19.5-30.3 L·s^(-1)·mmol^(-1))were at least 7 times higher than that of free CRL(2.36 L·s^(-1)·mmol^(-1))in DMSO.It was attributed to a significant increase in Kcat of the conjugates in nonaqueous media.The synthesis catalyzed by pNIPAM-CRL co njugates was influenced by the length and density of the grafted polymer,water content,solvent polarity and molar ratio of the substrates.In the optimal synthesis,the reaction time was shortened at least 7 times,and yields of vitamin E succinate by pNIPAM-g-CRL and free CRL were obtained to be 75.4%and 6.6%at 55℃after the reaction for 1.5 h.The result argued that conjugation with pNIPAM induced conformational change of the lid on CRL based on hydrophobic interaction,thus providing a higher possibility of catalysis-favorable conformation on CRL in nonaqueous media.Moreover,pNIPAM conjugation improved the thermal stability of CRL greatly,and the stability improved further with an increase of chain length of pNIPAM.At the optimal reaction conditions(55℃and 1.5 h),pNIPAM-g-CRL also exhibited good reusability in the enzymatic synthesis of vitamin E succinate and kept~70%of its catalytic activity after ten consecutive cycles.The research demonstrated that pNIPAM-g-CRL was a more competitive biocatalyst in the enzymatic synthesis of vitamin E succinate and exhibited good application potential under harsh industrial conditions.
