51
|
Purification, preliminary structural characterization and in vitro antioxidant activity of polysaccharides from Acanthus ilicifolius. Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2013.11.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
52
|
Liu X, Zhu L, Tan J, Zhou X, Xiao L, Yang X, Wang B. Glucosidase inhibitory activity and antioxidant activity of flavonoid compound and triterpenoid compound from Agrimonia Pilosa Ledeb. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 14:12. [PMID: 24410924 PMCID: PMC3909377 DOI: 10.1186/1472-6882-14-12] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 01/06/2014] [Indexed: 01/12/2023]
Abstract
BACKGROUND In Chinese traditional medicine, Agrimonia pilosa Ledeb (APL) exhibits great effect on treatment of type 2 diabetes mellitus (T2DM), however its mechanism is still unknown. Considering that T2DM are correlated with postprandial hyperglycemia and oxidative stress, we investigated the α-glucosidase inhibitory activity and the antioxidant activity of flavonoid compound (FC) and triterpenoid compound (TC) from APL. METHODS Entire plants of APL were extracted using 95% ethanol and 50% ethanol successively. The resulting extracts were partitioned and isolated by applying liquid chromatography using silica gel column and Sephadex LH 20 column to give FC and TC. The content of total flavonoids in FC and the content of total triterpenoids in TC were determined by using UV spectrophotometry. HPLC analysis was used to identify and quantify the monomeric compound in FC and TC. The α-glucosidase inhibitory activities were determined using the chromogenic method with p-nitrophenyl-α-D-glucopyranoside as substrate. Antioxidant activities were assessed through three kinds of radical scavenging assays (DPPH radical, ABTS radical and hydroxyl radical) & β-carotene-linoleic acid assay. RESULTS The results indicate FC is abundant of quercitrin, and hyperoside, and TC is abundant of 1β, 2β, 3β, 19α-tetrahydroxy-12-en-28-oic acid (265.2 mg/g) and corosolic acid (100.9 mg/g). The FC & the TC have strong α-glucosidase inhibitory activities with IC50 of 8.72 μg/mL and 3.67 μg/mL, respectively. We find that FC show competitive inhibition against α-glucosidase, while the TC exhibits noncompetitive inhibition. Furthermore, The FC exhibits significant radical scavenging activity with the EC50 values of 7.73 μg/mL, 3.64 μg/mL and 5.90 μg/mL on DPPH radical, hydroxyl radical and ABTS radical, respectively. The FC also shows moderate anti-lipid peroxidation activity with the IC50 values of 41.77 μg/mL on inhibiting β-carotene bleaching. CONCLUSION These results imply that the FC and the TC could be responsible for the good clinical effects of APL on T2MD through targeting oxidative stress and postprandial hyperglycaemia. So APL may be good sources of natural antioxidants and α-glucosidase inhibitors exhibiting remarkable potential value for the therapy of T2DM.
Collapse
Affiliation(s)
- Xi Liu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, No. 174, Shapingba Main Street, Chongqing 400030, China
| | - Liancai Zhu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, No. 174, Shapingba Main Street, Chongqing 400030, China
| | - Jun Tan
- School of Biological & Chemical engineering, Chongqing University of Education, Chongqing 400067, China
| | - Xuemei Zhou
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, No. 174, Shapingba Main Street, Chongqing 400030, China
| | - Ling Xiao
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, No. 174, Shapingba Main Street, Chongqing 400030, China
| | - Xian Yang
- College of Life Sciences, Chongqing Normal University, Chongqing 401331, China
| | - Bochu Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, No. 174, Shapingba Main Street, Chongqing 400030, China
| |
Collapse
|
53
|
Chavan YV, Singhal RS. Separation of polyphenols and arecoline from areca nut (Areca catechu L.) by solvent extraction, its antioxidant activity, and identification of polyphenols. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2013; 93:2580-2589. [PMID: 23494978 DOI: 10.1002/jsfa.6081] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 01/05/2013] [Accepted: 01/29/2013] [Indexed: 06/01/2023]
Abstract
BACKGROUND Areca nut (Areca catechu L.) or betel nut, a commercial cash crop, is a rich source of polyphenols but also contains toxic alkaloids, mainly arecoline. Separation of these bioactive polyphenols from toxic constituents could propel the safe and beneficial use of betel nut; also it will help arecanut processing industries to produce arecoline-free products. With the aim to develop an effective method for maximum extraction of polyphenols with minimum arecoline, several factors such as nature of the solvent, pH (2-10), substrate concentration (6-14 %) and extraction time (30-150 min) under shaking conditions were evaluated. Qualitative analysis was done using spectrophotometry and high-performance liquid chromatography (HPLC). RESULTS Maximum extraction of polyphenols (407.47 mg GAE g(-1)), total tannin and its antioxidant activity with minimum arecoline (1.73 mg g(-1) of sample) was achieved by using 80% acetone at pH 4 for 90 min with 10% w/v substrate under shaking conditions. CONCLUSION Solvent extraction under optimized parameters gave maximum polyphenols with minimum extraction of arecoline, and highest ratio of polyphenols to arecoline. HPLC and liquid chromatography-mass spectrometry results confirmed the presence of catechin and epicatechin in the extract, which suggests its potential as a source of bioactives.
Collapse
Affiliation(s)
- Yogita V Chavan
- Food Engineering and Technology Department, Institute of Chemical Technology, Matunga, Mumbai, India
| | | |
Collapse
|
54
|
Girgih AT, Udenigwe CC, Hasan FM, Gill TA, Aluko RE. Antioxidant properties of Salmon (Salmo salar) protein hydrolysate and peptide fractions isolated by reverse-phase HPLC. Food Res Int 2013. [DOI: 10.1016/j.foodres.2013.03.034] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
55
|
Gao D, Gao Z, Zhu G. Antioxidant effects of Lactobacillus plantarum via activation of transcription factor Nrf2. Food Funct 2013; 4:982-9. [PMID: 23681127 DOI: 10.1039/c3fo30316k] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present study was undertaken to investigate antioxidant and hypolipidemic effects, as well as its molecular mechanism of wild Lactobacillus plantarum FC225 isolated from fermented cabbages. The scavenging activities of superoxide anion radical, 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) and hydroxyl radical were enhanced by FC225 treatment. The strain FC225 also attenuated hyperlipidemic status, decreased lipid peroxidation, plasma cholesterol, triglyceride and low-density lipoprotein cholesterol levels in high fat diet-fed mice. Meanwhile, FC225 therapy could significantly elevate the activities of superoxidase dismutase and glutathione peroxidase, and decrease the content of malondialdehyde (MDA) in liver homogenates, whereas there was no change in catalase activity in high fat diet-fed mice. In addition, compared with the control group, FC225 markedly elevated the gene expression of nuclear factor erythroid 2-related factor 2 (Nrf2), which was in parallel with the increased value of CD4+/CD8+ ratio in the FC225-treated hyperlipidemic mice. The results demonstrated that the strain FC225 confers hypolipidemic and antioxidant protective effects which may be attributable to Nrf2 signal pathway mediated antioxidant enzyme expression.
Collapse
Affiliation(s)
- Dawei Gao
- Applying Chemistry Key Lab of Hebei Province, College of Environmental and Chemical Engineering, Yanshan University, no.438 Hebei Street, Qinhuangdao 066004, China.
| | | | | |
Collapse
|
56
|
Evaluation of biochemical, hematological and oxidative parameters in mice exposed to the herbicide glyphosate-Roundup(®). Interdiscip Toxicol 2013; 5:133-40. [PMID: 23554553 PMCID: PMC3600513 DOI: 10.2478/v10102-012-0022-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 08/10/2012] [Accepted: 09/16/2012] [Indexed: 11/29/2022] Open
Abstract
We evaluated the toxicity of hepatic, hematological, and oxidative effects of glyphosate-Roundup® on male and female albino Swiss mice. The animals were treated orally with either 50 or 500 mg/kg body weight of the herbicide, on a daily basis for a period of 15 days. Distilled water was used as control treatment. Samples of blood and hepatic tissue were collected at the end of the treatment. Hepatotoxicity was monitored by quantitative analysis of the serum enzymes ALT, AST, and γ-GT and renal toxicity by urea and creatinine. We also investigated liver tissues histopathologically. Alterations of hematological parameters were monitored by RBC, WBC, hemoglobin, hematocrit, MCV, MCH, and MCHC. TBARS (thiobarbituric acid reactive substances) and NPSH (non-protein thiols) were analyzed in the liver to assess oxidative damage. Significant increases in the levels of hepatic enzymes (ALT, AST, and γ-GT) were observed for both herbicide treatments, but no considerable differences were found by histological analysis. The hematological parameters showed significant alterations (500 mg/kg body weight) with reductions of RBC, hematocrit, and hemoglobin, together with a significant increase of MCV, in both sexes of mice. In males, there was an important increase in lipid peroxidation at both dosage levels, together with an NPSH decrease in the hepatic tissue, whereas in females significant changes in these parameters were observed only at the higher dose rate. The results of this study indicate that glyphosate-Roundup® can promote hematological and hepatic alterations, even at subacute exposure, which could be related to the induction of reactive oxygen species.
Collapse
|
57
|
Girgih AT, Udenigwe CC, Aluko RE. Reverse-phase HPLC separation of hemp seed (Cannabis sativa L.) protein hydrolysate produced peptide fractions with enhanced antioxidant capacity. PLANT FOODS FOR HUMAN NUTRITION (DORDRECHT, NETHERLANDS) 2013; 68:39-46. [PMID: 23417711 DOI: 10.1007/s11130-013-0340-6] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2023]
Abstract
Hemp seed protein hydrolysate (HPH) was produced through simulated gastrointestinal tract (GIT) digestion of hemp seed protein isolate followed by partial purification and separation into eight peptide fractions by reverse-phase (RP)-HPLC. The peptide fractions exhibited higher oxygen radical absorbance capacity as well as scavenging of 2,2-diphenyl-1-picrylhydrazyl, superoxide and hydroxyl radicals when compared to HPH. Radical scavenging activities of the fractionated peptides increased as content of hydrophobic amino acids or elution time was increased, with the exception of hydroxyl radical scavenging that showed decreased trend. Glutathione (GSH), HPH and the RP-HPLC peptide fractions possessed low ferric ion reducing ability but all had strong (>60 %) metal chelating activities. Inhibition of linoleic acid oxidation by some of the HPH peptide fractions was higher at 1 mg/ml when compared to that observed at 0.1 mg/ml peptide concentration. Peptide separation resulted in higher concentration of some hydrophobic amino acids (especially proline, leucine and isoleucine) in the fractions (mainly F5 and F8) when compared to HPH. The elution time-dependent increased concentrations of the hydrophobic amino acids coupled with decreased levels of positively charged amino acids may have been responsible for the significantly higher (p < 0.05) antioxidant properties observed for some of the peptide fractions when compared to the unfractionated HPH. In conclusion, the antioxidant activity of HPH after simulated GIT digestion is mainly influenced by the amino acid composition of some of its peptides.
Collapse
Affiliation(s)
- Abraham T Girgih
- Department of Human Nutritional Sciences and the Richardson Centre for Functional Foods and Nutraceuticals, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | | | | |
Collapse
|
58
|
Guo Y, Pan D, Wu Z, Zhao C, Cao J. Antioxidant activity and oxidative stress protection of duck proteins hydrolysates in SK-N-SH cells. Food Funct 2013; 4:476-80. [PMID: 23295546 DOI: 10.1039/c2fo30264k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Studies have found that natural antioxidants, which are free-radical scavengers, can reduce the risk of diseases caused by free radicals. This work investigated the antioxidant properties of duck proteins hydrolysates. The free-radical scavenging function of CP-1 (M(r) > 10 kDa), CP-2 (5 kDa < M(r) < 10 kDa) and CP-3 (M(r) < 5 kDa), obtained through ultrafiltration and gel filtration were evaluated. The results showed that the lower molecular weight fraction exhibited a stronger free-radical scavenging ability. The highest free-radical scavenging activity was detected in the fraction of p4 purified from CP-3 using Sephadex G-15 column chromatography. The 50% inhibitory value (IC(50)) of p4 for scavenging radicals of superoxide, hydroxyl and 1,1-diphenyl-2-pycrylhydrazyl (DPPH) were, respectively, 0.97 mg mL(-1), 0.84 mg mL(-1) and 1.84 mg mL(-1). Furthermore, the p4 fraction at a concentration of 10 μg mL(-1) increased cell viability from 84.8% to 94% under antioxidative stress in neuroblastoma SK-N-SH cells.
Collapse
Affiliation(s)
- Yuxing Guo
- Food Science and Nutrition Department, Ginling College, Nanjing Normal University, Nanjing 210097, P R China
| | | | | | | | | |
Collapse
|
59
|
Ultrasound-assisted extraction (UAE) of bioactives from arecanut (Areca catechu L.) and optimization study using response surface methodology. INNOV FOOD SCI EMERG 2013. [DOI: 10.1016/j.ifset.2012.10.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
60
|
Wang J, Ji HF, Wang SX, Zhang DY, Liu H, Shan DC, Wang YM. Lactobacillus plantarum ZLP001: In vitro Assessment of Antioxidant Capacity and Effect on Growth Performance and Antioxidant Status in Weaning Piglets. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2012; 25:1153-8. [PMID: 25049675 PMCID: PMC4093004 DOI: 10.5713/ajas.2012.12079] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 06/01/2012] [Accepted: 04/09/2012] [Indexed: 11/27/2022]
Abstract
The objective of this study was to evaluate the antioxidant capacity of Lactobacillus plantarum ZLP001 and its effects on growth performance and antioxidant status in weaning piglets. The survival in hydrogen peroxide and free radical-scavenging activity of Lactobacillus plantarum ZLP001 were analysed in vitro. The Lactobacillus plantarum ZLP001 showed high viability in 1.0 mmol/L hydrogen peroxide and high scavenging ability against hydroxyl, superoxide anion, and DPPH (1,1-diphenyl-2-picrylhydrazyl) radicals which was dose dependent. Ninety-six weaning piglets were selected (7.45±0.79 kg) and divided into three groups comprising of negative control without any supplementation, treatment group with supplemented 6.8×10(7) Lactobacillus plantarum ZLP001 CFU/g of diet, and positive control with antibiotic treatment (chlorotetracycline, 80 mg/kg diet). The results showed that Lactobacillus plantarum ZLP001 supplementation enhanced feed conversion rates in piglets compared with control (p<0.05). Supplementation of Lactobacillus plantarum ZLP001 increased the concentration of superoxide dismutase (p<0.05), glutathione peroxidase (p<0.01) and catalase in serum (p<0.10), while decreased the concentration of malondialdehyde (p<0.05). The present study implies that the strain Lactobacillus plantarum ZLP001 had high antioxidant ability and its supplementation improved the growth performance and antioxidant status of weaning piglets, so it can be considered useful to alleviate oxidative stress and increase productive performance of pigs. (Key Words: Probiotic, Antioxidant Capacity, Weaning Piglet).
Collapse
Affiliation(s)
| | - H. F. Ji
- Corresponding Author: H. F. Ji. Tel: +86-10-51-503-865, Fax: +86-10-88-433-070, E-mail:
| | | | | | | | | | | |
Collapse
|
61
|
Xia Y, Bamdad F, Gänzle M, Chen L. Fractionation and characterization of antioxidant peptides derived from barley glutelin by enzymatic hydrolysis. Food Chem 2012; 134:1509-18. [PMID: 25005974 DOI: 10.1016/j.foodchem.2012.03.063] [Citation(s) in RCA: 133] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 02/02/2012] [Accepted: 03/14/2012] [Indexed: 10/28/2022]
Abstract
The antioxidant properties of the barley glutelin hydrolysates were evaluated based on their radical scavenging capacity (DPPH/O₂(·-)/OH(·)), Fe(2+)-chelating effect and reducing power. Alcalase hydrolysates (AH) demonstrated significantly higher antioxidant capacity than those treated by flavourzyme in most of the assays. The AH was separated using ultra-filtration and reversed-phase chromatography, and assessment of the fractions indicated that the large-sized peptides (Mw>10 kDa) possessed stronger DPPH scavenging activity and reducing power, whereas small-sized peptides (Mw<1 kDa) were more effective in Fe(2+)-chelating and OH(·) scavenging effect. The hydrophobic fraction contributed more to Fe(2+)-chelating and OH(·) scavenging activity. Four peptides contributing to antioxidant activities were identified using LC-MS/MS: Gln-Lys-Pro-Phe-Pro-Gln-Gln-Pro-Pro-Phe, Pro-Gln-Ile-Pro-Glu-Gln-Phe, Leu-Arg-Thr-Leu-Pro-Met and Ser-Val-Asn-Val-Pro-Leu. Compared to the positive controls, AH exhibited excellent Fe(2+)-chelating activity and strong DPPH/OH scavenging effect. Thus hydrolyzed barley glutelin is a potential source of antioxidant peptides for food and nutraceutical applications.
Collapse
Affiliation(s)
- Yichen Xia
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada T6G 2P5
| | | | | | | |
Collapse
|
62
|
Dong X, Zhao M, Shi J, Yang B, Li J, Luo D, Jiang G, Jiang Y. Effects of combined high-pressure homogenization and enzymatic treatment on extraction yield, hydrolysis and function properties of peanut proteins. INNOV FOOD SCI EMERG 2011. [DOI: 10.1016/j.ifset.2011.07.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
63
|
Amadou I, Le GW, Shi YH, Jin S. Reducing, Radical Scavenging, and Chelation Properties of Fermented Soy Protein Meal Hydrolysate byLactobacillus plantarumLP6. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2011. [DOI: 10.1080/10942910903312502] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
64
|
Girgih AT, Udenigwe CC, Aluko RE. In Vitro Antioxidant Properties of Hemp Seed (Cannabis sativa L.) Protein Hydrolysate Fractions. J AM OIL CHEM SOC 2010. [DOI: 10.1007/s11746-010-1686-7] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
65
|
Extraction optimization, purification and antioxidant activity of procyanidins from hawthorn (C. pinnatifida Bge. var. major) fruits. Food Chem 2010. [DOI: 10.1016/j.foodchem.2009.09.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
66
|
Kim JY, Lee C, Sedlak DL, Yoon J, Nelson KL. Inactivation of MS2 coliphage by Fenton's reagent. WATER RESEARCH 2010; 44:2647-2653. [PMID: 20172583 DOI: 10.1016/j.watres.2010.01.025] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2009] [Revised: 01/23/2010] [Accepted: 01/25/2010] [Indexed: 05/28/2023]
Abstract
Fenton's reagent (i.e., Fe[II]/H2O2) is known to generate strong oxidants capable of oxidizing a broad spectrum of organic compounds in aqueous solution. This study demonstrates the successful inactivation of MS2 coliphage (MS2) by the oxidants produced from Fenton's reagent. The inactivation process of MS2 by Fenton's reagent was found to proceed in two distinct stages. The first stage inactivation, which took place rapidly within 1 min reaction time, was mainly achieved by the reaction of Fe(II) with H2O2 (i.e., the Fenton reaction). The second stage, which occurred by the catalytic reactions of Fe(III) with H2O2, exhibited much slower inactivation than the first stage. The rate of MS2 inactivation increased as pH decreased from 8.0 to 6.0. The addition of oxalate and humic acids significantly inhibited the MS2 inactivation, whereas 1,10-phenanthroline and bipyridine resulted in a gradual and steady inactivation of MS2. These observations on the effects of pH and iron-chelating agents indicate that oxidants formed on the surface or inside MS2 are responsible for the inactivation.
Collapse
Affiliation(s)
- Jee Yeon Kim
- School of Chemical and Biological Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | | | | | | | | |
Collapse
|
67
|
Yin JY, Nie SP, Zhou C, Wan Y, Xie MY. Chemical characteristics and antioxidant activities of polysaccharide purified from the seeds of Plantago asiatica L. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2010; 90:210-217. [PMID: 20355033 DOI: 10.1002/jsfa.3793] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND A water-soluble polysaccharide from the seeds of Plantago asiatica L. (P. asiatica L. polysaccharide, PLP) was extracted with hot water and purified by gel filtration chromatography. The chemical characteristics of PLP were determined by high-performance gel permeation chromatography (HPGPC) and Fourier transform infrared (FTIR) spectroscopy. In addition, the antioxidant activities of PLP in vitro were evaluated using various test systems, including scavenging of 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radicals, scavenging of superoxide radicals generated by 1,2,3-phentriol autoxidation, scavenging of hydroxyl radicals and inhibition of lipid peroxidation. RESULTS The molecular weight of PLP was determined by HPGPC to be about 1894 kDa. PLP contained 29.2 g kg(-1) protein and 145.8 g kg(-1) uronic acid. The FTIR spectrum of PLP also revealed typical characteristics of a polysaccharide containing protein and uronic acid. Moreover, the results showed that PLP possessed antioxidant activities, but lower than those of ascorbic acid. CONCLUSION PLP is an acid protein-bound polysaccharide of high molecular weight, but its structure needs further study. The present results suggest that PLP could potentially be used as a natural antioxidant.
Collapse
Affiliation(s)
- Jun-Yi Yin
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | | | | | | | | |
Collapse
|
68
|
Zhu L, Tan J, Wang B, He R, Liu Y, Zheng C. Antioxidant Activities of Aqueous Extract fromAgrimonia pilosaLedeb and Its Fractions. Chem Biodivers 2009; 6:1716-26. [DOI: 10.1002/cbdv.200800248] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
69
|
Hall MD, Handley MD, Gottesman MM. Is resistance useless? Multidrug resistance and collateral sensitivity. Trends Pharmacol Sci 2009; 30:546-56. [PMID: 19762091 DOI: 10.1016/j.tips.2009.07.003] [Citation(s) in RCA: 199] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2009] [Revised: 07/14/2009] [Accepted: 07/21/2009] [Indexed: 01/19/2023]
Abstract
When cancer cells develop resistance to chemotherapeutics, it is frequently conferred by the ATP-dependent efflux pump P-glycoprotein (MDR1, P-gp, ABCB1). P-gp can efflux a wide range of cancer drugs; its expression confers cross-resistance, termed "multidrug resistance" (MDR), to a wide range of drugs. Strategies to overcome this resistance have been actively sought for more than 30 years, yet clinical solutions do not exist. A less understood aspect of MDR is the hypersensitivity of resistant cancer cells to other drugs, a phenomenon known as "collateral sensitivity" (CS). This review highlights the extent of this effect for the first time, and discusses hypotheses (e.g. generation of reactive oxygen species) to account for the underlying generality of this phenomenon, and proposes exploitation of CS as a strategy to improve response to chemotherapy.
Collapse
Affiliation(s)
- Matthew D Hall
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | | | | |
Collapse
|
70
|
Genaro-Mattos TC, Dalvi LT, Oliveira RG, Ginani JS, Hermes-Lima M. Reevaluation of the 2-deoxyribose assay for determination of free radical formation. Biochim Biophys Acta Gen Subj 2009; 1790:1636-42. [PMID: 19747523 DOI: 10.1016/j.bbagen.2009.09.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 08/08/2009] [Accepted: 09/03/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND The 2-deoxyribose (2-DR) degradation assay is a widely used test for determining anti/pro-oxidant properties of molecules and plant extracts. Most reports use reaction blanks omitting 2-DR or thiobarbituric acid (TBA). However, when studying Fe(II)-mediated reactions, we verified that these blanks are not appropriate. Fe(III)--a product of these reactions--causes a relevant artifact in the assay, where 2-DR is oxidized by Fe(III). METHOD 2-DR degradation was determined at 532 nm as TBA-reactive substances. RESULTS AND CONCLUSION HPLC determinations indicated that Fe(III) added after or before TBA generates considerable amounts of malondialdehyde (2-DR degradation product) in comparison with assays employing Fenton reagents or Fe(II) autoxidation. Addition of catalase and thiourea has no effect on Fe(III)-induced 2-DR degradation indicating lack of ROS involvement. This Fe(III)-mediated 2-DR damage is dependent on iron and 2-DR concentrations, but not on H2O2, buffer composition or iron-chelators. Depending on the assay conditions Fe(III)-interference accounts for 20% to 90% of 2-DR degradation mediated by Fe(II). SIGNIFICANCE A new reaction blank is proposed herein-based on the use of Fe(III)-for the assay. The lack of such correction has caused the underestimation of antioxidant capacity of various compounds in many studies in the last 2 decades.
Collapse
Affiliation(s)
- Thiago C Genaro-Mattos
- Oxyradical Research Group, Departamento de Biologia Celular, Universidade de Brasília, 70910-900 Brasília, DF, Brazil
| | | | | | | | | |
Collapse
|
71
|
Zhou J, Melman G, Pita M, Ornatska M, Wang X, Melman A, Katz E. Biomolecular Oxidative Damage Activated by Enzymatic Logic Systems: Biologically Inspired Approach. Chembiochem 2009; 10:1084-90. [DOI: 10.1002/cbic.200800833] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
72
|
Luo Y, Chen G, Li B, Ji B, Guo Y, Tian F. Evaluation of antioxidative and hypolipidemic properties of a novel functional diet formulation of Auricularia auricula and Hawthorn. INNOV FOOD SCI EMERG 2009. [DOI: 10.1016/j.ifset.2008.06.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
73
|
Wang AN, Yi XW, Yu HF, Dong B, Qiao SY. Free radical scavenging activity of Lactobacillus fermentum in vitro and its antioxidative effect on growing-finishing pigs. J Appl Microbiol 2009; 107:1140-8. [PMID: 19486423 DOI: 10.1111/j.1365-2672.2009.04294.x] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To evaluate the free radical-scavenging capacity of Lactobacillus fermentum and its effects on antioxidant enzyme levels in finishing pigs. METHODS AND RESULTS The free radical-scavenging activity of Lact. fermentum was analysed in vitro. The tested Lactobacillus showed a high scavenging ability against DPPH (1,1-diphenyl-2-picrylhydrazyl), superoxide and hydroxyl radicals which was dose dependent. Subsequently, 108 crossbred pigs weighing 20.67 BW, were allotted to dietary treatments including a basal diet or the basal diet supplemented with either aureomycin or 10.2 x 10(7) Lact. fermentum CFU g(-1) diet. Supplementation of Lact. fermentum increased total antioxidant capacity (P < 0.01) in serum from 50 kg pigs, while serum superoxide dismutase (P = 0.01) and glutathione peroxidase (P < 0.01) increased, and malondialdehyde levels decreased (P < 0.01) in 90 kg pigs. Hepatic catalase (P = 0.04), muscle superoxide dismutase (P < 0.01) and copper-zinc-superoxide dismutase were enhanced (P = 0.01), whereas malondialdehyde levels were reduced (P = 0.05) by Lact. fermentum. CONCLUSIONS The free radical-scavenging capacity of Lact. fermentum was dose dependent and its supplementation improved the antioxidant status of pigs. SIGNIFICANCE AND IMPACT OF THE STUDY Lactobacillus fermentum could be used to alleviate oxidative stress and increase pig performance and improve pork quality.
Collapse
Affiliation(s)
- A N Wang
- State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing 100193, China
| | | | | | | | | |
Collapse
|
74
|
Minerals, polysaccharides and antioxidant properties of aqueous solutions obtained from macroalgal beach-casts in the Noto Peninsula, Ishikawa, Japan. Food Chem 2009. [DOI: 10.1016/j.foodchem.2008.06.008] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
75
|
Leite MS, Thomaz R, Oliveira JHM, Oliveira PL, Meyer-Fernandes JR. Trypanosoma brucei brucei: effects of ferrous iron and heme on ecto-nucleoside triphosphate diphosphohydrolase activity. Exp Parasitol 2008; 121:137-43. [PMID: 19027737 DOI: 10.1016/j.exppara.2008.10.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 10/09/2008] [Accepted: 10/24/2008] [Indexed: 01/17/2023]
Abstract
Trypanosoma brucei brucei is the causative agent of animal African trypanosomiasis, also called nagana. Procyclic vector form resides in the midgut of the tsetse fly, which feeds exclusively on blood. Hemoglobin digestion occurs in the midgut resulting in an intense release of free heme. In the present study we show that the magnesium-dependent ecto-nucleoside triphosphate diphosphohydrolase (E-NTPDase) activity of procyclic T. brucei brucei is inhibited by ferrous iron and heme. The inhibition of E-NTPDase activity by ferrous iron, but not by heme, was prevented by pre-incubation of cells with catalase. However, antioxidants that permeate cells, such as PEG-catalase and N-acetyl-cysteine prevented the inhibition of E-NTPDase by heme. Ferrous iron was able to induce an increase in lipid peroxidation, while heme did not. Therefore, both ferrous iron and heme can inhibit E-NTPDase activity of T. brucei brucei by means of formation of reactive oxygen species, but apparently acting through distinct mechanisms.
Collapse
Affiliation(s)
- Milane S Leite
- Laboratório de Bioquímica Celular, Instituto de Bioquímica Médica, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, UFRJ, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
| | | | | | | | | |
Collapse
|
76
|
Li Y, Jiang B, Zhang T, Mu W, Liu J. Antioxidant and free radical-scavenging activities of chickpea protein hydrolysate (CPH). Food Chem 2008. [DOI: 10.1016/j.foodchem.2007.04.067] [Citation(s) in RCA: 528] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
77
|
Cardoso LA, Ferreira ST, Hermes-Lima M. Reductive inactivation of yeast glutathione reductase by Fe(II) and NADPH. Comp Biochem Physiol A Mol Integr Physiol 2007; 151:313-321. [PMID: 17544307 DOI: 10.1016/j.cbpa.2007.03.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2006] [Revised: 03/18/2007] [Accepted: 03/23/2007] [Indexed: 11/18/2022]
Abstract
Glutathione reductase (GR) carries out the enzymatic reduction of glutathione disulfide (GSSG) to its reduced form (GSH) at the expense of the reducing power of NADPH. Previous studies have shown that GR from several species is progressively inactivated in the presence of NADPH, but that the mechanism of inactivation (especially in the presence of metals) has not been fully elucidated. We have investigated the involvement of iron ions in the inactivation of yeast (Saccharomyces cerevisiae) GR in the presence of NADPH. Even in the absence of added iron, inactivation of GR was partly blocked by the iron chelators, deferoxamine and ortho-phenanthroline, suggesting the involvement of trace amounts of contaminating iron in the mechanism of inhibition. Exogenously added antioxidants including ethanol, dimethylsulfoxide and 2-deoxyribose did not protect GR against NADPH-induced inactivation, whilst addition of exogenous Fe(II) (but not Fe(III)) potentiated the inactivation. Moreover, removal of oxygen from the medium led to increased inhibition of GR, whereas pre-incubation of the Fe(II)-containing medium for 30 min under normoxic conditions prior to the addition of GR abolished the enzyme inactivation by NADPH. Under these pre-incubation conditions, Fe(II) is fully oxidized to Fe(III) within 1 min. Furthermore, GR that had been previously inactivated in the presence of Fe(II) plus NADPH could be partially reactivated by treatment with ortho-phenanthroline and deferoxamine. In contrast, Fe(III) had no effect on GR reactivation. Together, these results indicate that yeast GR is inactivated by a reductive mechanism mediated by NADPH and Fe(II). According to this mechanism, GR is diverted from its normal redox cycling by the generation of an inactive reduced enzyme form in which both the FAD and thiol groups at the active site are likely in a reduced state.
Collapse
Affiliation(s)
- Luciano A Cardoso
- Oxyradical Research Group, Departamento de Biologia Celular, Universidade de Brasília, Brasília, DF 70910-900, Brazil
| | - Sérgio T Ferreira
- Programa de Bioquímica e Biofisica Celular, Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21944-590, Brazil
| | - Marcelo Hermes-Lima
- Oxyradical Research Group, Departamento de Biologia Celular, Universidade de Brasília, Brasília, DF 70910-900, Brazil.
| |
Collapse
|
78
|
Rivero-Müller A, De Vizcaya-Ruiz A, Plant N, Ruiz L, Dobrota M. Mixed chelate copper complex, Casiopeina IIgly, binds and degrades nucleic acids: a mechanism of cytotoxicity. Chem Biol Interact 2006; 165:189-99. [PMID: 17217939 DOI: 10.1016/j.cbi.2006.12.002] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Revised: 12/07/2006] [Accepted: 12/08/2006] [Indexed: 10/23/2022]
Abstract
Metal-containing drugs that interact with DNA have been designed and studied for their anticancer activity. In this study, the mixed chelate copper-based anticancer drugs, the casiopeinas, were found to bind to DNA and to degrade DNA and RNA in the presence of reducing agents (e.g. ascorbic acid). Casiopeinas binding to DNA is high affinity, with harsh wash conditions failing to remove the interaction. The reaction requires oxygen, probably involved in the generation of *OH radicals, which would be responsible for the strand breakage. The reaction was diminished by catalase, and was completely abolished by copper chelators (e.g. trientine, EDTA); however, superoxide dismutase (SOD) had no significant effect on casiopeina-mediated DNA degradation. Casiopeina IIgly (casIIgly) in the presence of ascorbate was capable of degrading RNA, plasmid and genomic DNA, and chromatin and intranuclear genetic material. Moreover, catalase and/or SOD partially protected cells, ascorbic acid enhanced and trientine, a copper chelator, abolished the cytotoxicity of casIIgly. The generation of 8-oxodG in cells exposed to casIIgly suggests that the generation of ROS is the major cause of the cytotoxicity observed and underlies the high toxicity and anticancer activity of these compounds.
Collapse
Affiliation(s)
- Adolfo Rivero-Müller
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, Surrey GU2 5XH, UK.
| | | | | | | | | |
Collapse
|
79
|
Heffeter P, Jakupec MA, Körner W, Wild S, von Keyserlingk NG, Elbling L, Zorbas H, Korynevska A, Knasmüller S, Sutterlüty H, Micksche M, Keppler BK, Berger W. Anticancer activity of the lanthanum compound [tris(1,10-phenanthroline)lanthanum(III)]trithiocyanate (KP772; FFC24). Biochem Pharmacol 2006; 71:426-40. [PMID: 16343446 DOI: 10.1016/j.bcp.2005.11.009] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2005] [Revised: 11/07/2005] [Accepted: 11/09/2005] [Indexed: 11/18/2022]
Abstract
Aim of this study was to investigate the anticancer properties of the new lanthanum compound [tris(1,10-phenanthroline)lanthanum(III)]trithiocyanate (KP772; FFC24). In vitro, growth inhibition by KP772 was comparable for >60 tumour cell models with IC50 values generally in the low microM range. KP772 induced tumour cell apoptosis indicated by chromatin condensation, caspase substrate cleavage and mitochondrial membrane depolarisation. DNA is unlikely to represent the primary molecular target of KP772, as no significant interaction or damage of DNA was detectable both in vitro and in living cells. Moreover, we found no evidence for induction of radical species. In contrast, KP772 potently inhibited DNA synthesis paralleled by a massive block of cell cycle in G0/G1 phase and a selective decrease of cyclin B1. Although treatment with KP772 induced expression of p53 and p21Waf1, transfection of wild-type p53 into knock-out cells only marginally enhanced the cytostatic activity of KP772. In vivo, the anticancer activity of KP772 against human DLD-1 colon carcinoma xenografts was comparable to that of cisplatin and methotrexate at doses not causing significant adverse effects. With regard to toxicity, the LD50 and no-observed-adverse-effect levels (NOAEL) of KP772 in Sprague-Dawley rats were 21.6 and 7.5 mg/kg, in outbred albino mice 62 and 10 mg/kg, respectively. In summary, KP772 exerts anticancer activity via potent induction of cell cycle arrest and/or apoptosis and has promising in vivo anticancer activity against a human colon cancer xenograft. Together, these data suggest further development of KP772 as a new anticancer metal-drug.
Collapse
Affiliation(s)
- Petra Heffeter
- Institute of Cancer Research, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090 Vienna, Austria
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|