1
|
Mobarak A, C. Thambiah S, Masiman AD, Samsudin IN, Lai YY. Refractory hypoxia and saturation gap in a COVID-19 patient. Pract Lab Med 2024; 40:e00395. [PMID: 38707259 PMCID: PMC11068595 DOI: 10.1016/j.plabm.2024.e00395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/02/2024] [Accepted: 04/17/2024] [Indexed: 05/07/2024] Open
Abstract
Acquired methemoglobinemia, predominantly due to oxidizing medications occurs when heme iron in hemoglobin is oxidized from ferrous to ferric ion and binds oxygen irreversibly leading to functional anemia, cyanosis, and tissue hypoxia. We report a case of a 60-year-old man with multiple comorbidities who was diagnosed with coronavirus disease 2019 (COVID-19) and developed methemoglobinemia after consumption of prescribed supplements. He presented with dyspnea and cyanosis. An oxygen saturation gap with characteristic chocolate-brown arterial blood indicated methemoglobinemia. Outsourced methemoglobin (MetHb) was increased at 9.0%. Despite aggressive intervention, he succumbed to his illness. In this case, we discuss the pathophysiology of why some individuals, especially the elderly with COVID-19 are more susceptible to develop methemoglobinemia after possibly being exposed to oxidizing agents. Laboratory methods for assessing oxygen saturation, including pulse oximetry, arterial blood gas and co-oximetry are examined in relation to this case. The importance of considering a diagnosis of methemoglobinemia based on clinical and biochemical findings although MetHb assay or co-oximetry are not readily available is also emphasized.
Collapse
Affiliation(s)
- Abidah Mobarak
- Department of Pathology, Hospital Melaka, Ministry of Health Malaysia, Malaysia
- Department of Pathology, Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, Malaysia
| | - Subashini C. Thambiah
- Department of Pathology, Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, Malaysia
| | - Ana Daliela Masiman
- Department of Pathology, Hospital Melaka, Ministry of Health Malaysia, Malaysia
| | - Intan Nureslyna Samsudin
- Department of Pathology, Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, Malaysia
| | - Yin Ye Lai
- Department of Pathology, Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, Malaysia
| |
Collapse
|
2
|
Wendo JK, Mbaria JM, Nyariki JN, Isaac AO. Ginkgo biloba attenuated detrimental inflammatory and oxidative events due to Trypanosoma brucei rhodesiense in mice treated with melarsoprol. PLoS Negl Trop Dis 2024; 18:e0012103. [PMID: 38620045 PMCID: PMC11045140 DOI: 10.1371/journal.pntd.0012103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 04/25/2024] [Accepted: 03/25/2024] [Indexed: 04/17/2024] Open
Abstract
BACKGROUND The severe late stage Human African Trypanosomiasis (HAT) caused by Trypanosoma brucei rhodesiense (T.b.r) is characterized by damage to the blood brain barrier, severe brain inflammation, oxidative stress and organ damage. Melarsoprol (MelB) is currently the only treatment available for this disease. MelB use is limited by its lethal neurotoxicity due to post-treatment reactive encephalopathy. This study sought to assess the potential of Ginkgo biloba (GB), a potent anti-inflammatory and antioxidant, to protect the integrity of the blood brain barrier and ameliorate detrimental inflammatory and oxidative events due to T.b.r in mice treated with MelB. METHODOLOGY Group one constituted the control; group two was infected with T.b.r; group three was infected with T.b.r and treated with 2.2 mg/kg melarsoprol for 10 days; group four was infected with T.b.r and administered with GB 80 mg/kg for 30 days; group five was given GB 80mg/kg for two weeks before infection with T.b.r, and continued thereafter and group six was infected with T.b.r, administered with GB and treated with MelB. RESULTS Co-administration of MelB and GB improved the survival rate of infected mice. When administered separately, MelB and GB protected the integrity of the blood brain barrier and improved neurological function in infected mice. Furthermore, the administration of MelB and GB prevented T.b.r-induced microcytic hypochromic anaemia and thrombocytopenia, as well as T.b.r-driven downregulation of total WBCs. Glutathione analysis showed that co-administration of MelB and GB prevented T.b.r-induced oxidative stress in the brain, spleen, heart and lungs. Notably, GB averted peroxidation and oxidant damage by ameliorating T.b.r and MelB-driven elevation of malondialdehyde (MDA) in the brain, kidney and liver. In fact, the co-administered group for the liver, registered the lowest MDA levels for infected mice. T.b.r-driven elevation of serum TNF-α, IFN-γ, uric acid and urea was abrogated by MelB and GB. Co-administration of MelB and GB was most effective in stabilizing TNFα levels. GB attenuated T.b.r and MelB-driven up-regulation of nitrite. CONCLUSION Utilization of GB as an adjuvant therapy may ameliorate detrimental effects caused by T.b.r infection and MelB toxicity during late stage HAT.
Collapse
Affiliation(s)
- Janet Khatenje Wendo
- The University of Nairobi, Department of Public Health, Pharmacology and Toxicology, Kangemi (Nairobi), Kenya
- The Technical University of Kenya, Department of Pharmaceutical Sciences and Technology, Nairobi, Kenya
| | - James Mucunu Mbaria
- The University of Nairobi, Department of Public Health, Pharmacology and Toxicology, Kangemi (Nairobi), Kenya
| | - James Nyabuga Nyariki
- The Technical University of Kenya, Department of Biochemistry and Biotechnology, Nairobi, Kenya
| | - Alfred Orina Isaac
- The Technical University of Kenya, Department of Pharmaceutical Sciences and Technology, Nairobi, Kenya
| |
Collapse
|
3
|
Zhang D, Zhang J, Ma Z, Wu Q, Liu M, Fan T, Ding L, Ren D, Wen A, Wang J. Luteoloside inhibits Aβ1-42 fibrillogenesis, disintegrates preformed fibrils, and alleviates amyloid-induced cytotoxicity. Biophys Chem 2024; 306:107171. [PMID: 38194817 DOI: 10.1016/j.bpc.2023.107171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/17/2023] [Accepted: 12/30/2023] [Indexed: 01/11/2024]
Abstract
Abnormal aggregation and fibrillogenesis of amyloid-β protein (Aβ) can cause Alzheimer's disease (AD). Thus, the discovery of effective drugs that inhibit Aβ fibrillogenesis in the brain is crucial for the treatment of AD. Luteoloside, as one of the polyphenolic compounds, is found to have a certain therapeutic effect on nervous system diseases. However, it remains unknown whether luteoloside is a potential drug for treating AD by modulating Aβ aggregation pathway. In this study, we performed diverse biophysical and biochemical methods to explore the inhibition of luteoloside on Aβ1-42 which is linked to AD. The results demonstrated that luteoloside efficiently prevented amyloid oligomerization and cross-β-sheet formation, reduced the rate of amyloid growth and the length of amyloid fibrils in a dose-dependent manner. Moreover, luteoloside was able to influence aggregation and conformation of Aβ1-42 during different fiber-forming phases, and it could disintegrate already preformed fibrils of Aβ1-42 and convert them into nontoxic aggregates. Furthermore, luteoloside protected cells from amyloid-induced cytotoxicity and hemolysis, and attenuated the level of reactive oxygen species (ROS). The molecular docking study showed that luteoloside interacted with Aβ1-42 mainly via Conventional Hydrogen Bond, Carbon Hydrogen Bond, Pi-Pi T-shaped, Pi-Alkyl and Pi-Anion, thereby possibly preventing it from forming the aggregates. These observations indicate that luteoloside, a natural anti-oxidant molecule, may be applicable as an effective inhibitor of Aβ, and promote further exploration of the therapeutic strategy against AD.
Collapse
Affiliation(s)
- Di Zhang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Juanli Zhang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Zhongying Ma
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Qianwen Wu
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Meiyou Liu
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Tingting Fan
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Likun Ding
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Danjun Ren
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Aidong Wen
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
| | - Jingwen Wang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
| |
Collapse
|
4
|
Alghareeb SA, Alfhili MA, Alsughayyir J. Rosmarinic Acid Elicits Calcium-Dependent and Sucrose-Sensitive Eryptosis and Hemolysis through p38 MAPK, CK1α, and PKC. Molecules 2023; 28:8053. [PMID: 38138543 PMCID: PMC10745317 DOI: 10.3390/molecules28248053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 12/01/2023] [Accepted: 12/09/2023] [Indexed: 12/24/2023] Open
Abstract
BACKGROUND Rosmarinic acid (RA) possesses promising anticancer potential, but further development of chemotherapeutic agents is hindered by their toxicity to off-target tissue. In particular, chemotherapy-related anemia is a major obstacle in cancer therapy, which may be aggravated by hemolysis and eryptosis. This work presents a toxicity assessment of RA in human RBCs and explores associated molecular mechanisms. METHODS RBCs isolated from healthy donors were treated with anticancer concentrations of RA (10-800 μM) for 24 h at 37 °C, and hemolysis and related markers were photometrically measured. Flow cytometry was used to detect canonical markers of eryptosis, including phosphatidylserine (PS) exposure by annexin-V-FITC, intracellular Ca2+ by Fluo4/AM, cell size by FSC, and oxidative stress by H2DCFDA. Ions and pH were assessed by an ion-selective electrode, while B12 was detected by chemiluminescence. RESULTS RA elicited concentration-dependent hemolysis with AST and LDH release but rescued the cells from hypotonic lysis at sub-hemolytic concentrations. RA also significantly increased annexin-V-positive cells, which was ameliorated by extracellular Ca2+ removal and isosmotic sucrose. Furthermore, a significant increase in Fluo4-positive cells and B12 content and a decrease in FSC and extracellular pH with KCl efflux were noted upon RA treatment. Hemolysis was augmented by blocking KCl efflux and was blunted by ATP, SB203580, staurosporin, D4476, isosmotic urea, and PEG 8000. CONCLUSIONS RA stimulates Ca2+-dependent and sucrose-sensitive hemolysis and eryptosis characterized by PS exposure, Ca2+ accumulation, loss of ionic regulation, and cell shrinkage. These toxic effects were mediated through energy deprivation, p38 MAPK, protein kinase C, and casein kinase 1α.
Collapse
Affiliation(s)
| | | | - Jawaher Alsughayyir
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh 12372, Saudi Arabia; (S.A.A.); (M.A.A.)
| |
Collapse
|
5
|
Alfhili MA, Alyousef AM, Alsughayyir J. Tamoxifen induces eryptosis through calcium accumulation and oxidative stress. Med Oncol 2023; 40:333. [PMID: 37848569 DOI: 10.1007/s12032-023-02205-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 09/25/2023] [Indexed: 10/19/2023]
Abstract
Chemotherapy-related anemia is a major obstacle in anticancer therapy. Tamoxifen (TAM) is an antiestrogen prescribed for breast cancer patients with hemolytic potential and apoptotic properties in nucleated cells. However, the eryptotic activity of TAM has hitherto escaped the efforts of investigators. RBCs from apparently healthy volunteers were treated with 1-50 μM of TAM for 24 h at 37 °C. Hemoglobin leakage and LDH, AST, and AChE activities were photometrically determined while K+, Na+, and Mg2+ were detected by ion-selective electrode. Flow cytometry was used to identify eryptotic cells by annexin-V-FITC, intracellular Ca2+ by Fluo4/AM, sell size and morphology by FSC and SSC signals, respectively, and oxidative stress by H2DCFDA. Whole blood was also exposed to 30 μM of TAM for 24 h at 37 °C to examine the toxicity of TAM to WBCs and platelets. TAM caused Ca2+-independent, dose-responsive hemolysis accompanied by K+, LDH, and AST leakage without improving the mechanical stability of RBCs in hypotonic environments. TAM treatment also increased the proportion of cells positive for annexin-V-FITC, Fluo4, and DCF, along with diminished FSC and SSC signals and AChE activity. Notably, TAM toxicity was aggravated by sucrose but abrogated by vitamin C, PEG 8000, and urea. Moreover, TAM exhibited distinct cytotoxic profiles against leukocytes and platelets. TAM-induced eryptosis is characterized by breakdown of membrane asymmetry, inhibition of AChE activity, Ca2+ accumulation, cell shrinkage, and oxidative stress. Vitamin C, PEG 8000, and urea may hold promise to subvert the undesirable toxic effects of TAM on RBCs.
Collapse
Affiliation(s)
- Mohammad A Alfhili
- Chair of Medical and Molecular Genetics Research, Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, 12372, Riyadh, Saudi Arabia.
| | - Abdulaziz M Alyousef
- Chair of Medical and Molecular Genetics Research, Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, 12372, Riyadh, Saudi Arabia
| | - Jawaher Alsughayyir
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, 12372, Riyadh, Saudi Arabia
| |
Collapse
|
6
|
Wairimu NW, Wairagu P, Chepukosi KW, Obiero GF, Okanya PW, Isaac AO, Nyariki JN. Sodium Metabisulfite-Induced Hematotoxicity, Oxidative Stress, and Organ Damage Ameliorated by Standardized Ginkgo biloba in Mice. J Toxicol 2023; 2023:7058016. [PMID: 37854041 PMCID: PMC10581848 DOI: 10.1155/2023/7058016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 09/15/2023] [Accepted: 10/04/2023] [Indexed: 10/20/2023] Open
Abstract
Sodium metabisulfite (SMB) is a biocide and antioxidant agent generally used as a preservative in food and beverage industries but can oxidize to harmful sulfite radicals. A standardized Ginkgo biloba (EGb-761) has demonstrated potent antioxidant and anti-inflammatory activities, which is beneficial for the treatment of diseases that exhibit oxidative stress and inflammation. The present study sought to investigate the putative ameliorative effects of EGb-761 against SMB-induced toxicity in mice. Thirty-two male Swiss white mice were randomized into control, SMB-treated, SMB + EGb-761-treated, and EGb-761-treated groups. EGb-761 (100 mg/kg/day) and SMB (98 mg/kg/day) were administered by gastric gavage for 40 days. Oral administration of EGb-761 restored SMB-induced decrease in body weight and prevented SMB-induced thrombocytopenia, leukocytosis, and anemia. Furthermore, EGb-761-treatment protected against SMB-induced liver and kidney injury depicted by decreased serum levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase, bilirubin, creatinine, urea, uric acid, and albumin. Furthermore, EGb-761 treatment attenuated SMB-driven dyslipidemia and metabolic acidosis. Besides, EGb-761 supplementation abrogated SMB-driven oxidative stress as depicted by stabilized reduced glutathione (GSH) levels in the brain, liver, kidney, spleen, heart, and lungs. SMB induced a significant increase of tissue levels of malondialdehyde (MDA), serum nitric oxide (NO), interferon-gamma (IFN-γ) and tumor necrosis factor-α (TNF-α) which were abrogated by EGb-761 treatment. In conclusion, these results deepen our understanding of EGb-761 in light of various detrimental effects of SMB-driven toxicities. These findings provide a novel approach that can be optimized for preventing or treating exposure due to SMB toxicity.
Collapse
Affiliation(s)
- Nancy Wambui Wairimu
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| | - Peninah Wairagu
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| | - Kennedy W. Chepukosi
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| | - George F. Obiero
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| | - Patrick W. Okanya
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| | - Alfred Orina Isaac
- Department of Pharmaceutical Technology, School of Health Sciences and Technology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| | - James Nyabuga Nyariki
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P. O. Box 52428, Nairobi 00200, Kenya
| |
Collapse
|
7
|
Alghareeb SA, Alsughayyir J, Alfhili MA. Stimulation of Hemolysis and Eryptosis by α-Mangostin through Rac1 GTPase and Oxidative Injury in Human Red Blood Cells. Molecules 2023; 28:6495. [PMID: 37764276 PMCID: PMC10535552 DOI: 10.3390/molecules28186495] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/02/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Chemotherapy-related anemia is prevalent in up to 75% of patients, which may arise due to hemolysis and eryptosis. Alpha-mangostin (α-MG) is a polyphenolic xanthonoid found in the mangosteen tree (Garcinia mangostana) whose antitumor medicinal properties are well-established. Nevertheless, the potential toxic effects of α-MG on red blood cells (RBCs) have, as of yet, not been as well studied. METHODS RBCs were exposed to 1-40 μM of α-MG for 24 h at 37 °C. Hemolysis and related markers were measured using colorimetric assays, eryptotic cells were identified through Annexin-V-FITC, Ca2+ was detected with Fluo4/AM, and oxidative stress was assessed through H2DCFDA using flow cytometry. The toxicity of α-MG was also examined in the presence of specific signal transduction inhibitors and in whole blood. RESULTS α-MG at 10-40 μM caused dose-dependent hemolysis with concurrent significant elevation in K+, Mg2+, and LDH leakage, but at 2.5 μM it significantly increased the osmotic resistance of cells. A significant increase was also noted in Annexin-V-binding cells, along with intracellular Ca2+, oxidative stress, and cell shrinkage. Moreover, acetylcholinesterase activity was significantly inhibited by α-MG, whose hemolytic potential was significantly ameliorated by the presence of BAPTA-AM, vitamin C, NSC23766, and isosmotic sucrose but not urea. In whole blood, α-MG significantly depleted intracellular hemoglobin stores and was selectively toxic to platelets and monocytes. CONCLUSIONS α-MG possesses hemolytic and eryptotic activities mediated through Ca2+ signaling, Rac1 GTPase activity, and oxidative injury. Also, α-MG leads to accelerated cellular aging and specifically targets platelet and monocyte populations in a whole blood milieu.
Collapse
Affiliation(s)
| | | | - Mohammad A. Alfhili
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh 12372, Saudi Arabia (J.A.)
| |
Collapse
|
8
|
Sarecka-Hujar B, Szulc-Musioł B. Herbal Medicines-Are They Effective and Safe during Pregnancy? Pharmaceutics 2022; 14:171. [PMID: 35057067 PMCID: PMC8802657 DOI: 10.3390/pharmaceutics14010171] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 12/13/2021] [Accepted: 01/08/2022] [Indexed: 02/05/2023] Open
Abstract
Since the teratogenicity of Thalidomide has been proven, herbal products are more commonly used in pregnancy to not only relieve morning sickness but also to fight infections. These products are frequently considered as natural and therefore harmless. However, herbs contain a number of active substances that, when used during pregnancy, can affect the development of the fetus. Often, pregnant women do not consult the usage of herbal medicines with a physician. The access to these products is easy and treatment of certain ailments with the use of herbs is common in many countries. The aim of the present literature review was to discuss available data regarding the efficacy and safety of cranberry, chamomile, Echinacea purpurea, garlic, ginger, Ginkgo biloba, and peppermint, which are used to counteract the most common ailments during pregnancy, i.e., infections and pregnancy-related ailments (e.g., nausea and vomiting, dizziness, and headache). Analysis of available data showed that ginger is one of the most extensively analyzed herbal remedies. The dose of ginger below 1000 mg per day may help to relief hypereremesis gravidarum, and such an amount of ginger did not increase frequency of adverse effects for either woman or developing fetus. Data regarding other herbs are most often heterogeneous and give conflicting results with no clear conclusions. However, all herbal products should be used with a special caution in pregnancy. Further high-quality human studies should be determined to confirm the safe doses of herbal products which could be used by pregnant or breast-feeding women.
Collapse
Affiliation(s)
- Beata Sarecka-Hujar
- Department of Basic Biomedical Science, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Kasztanowa Str. 3, 41-200 Sosnowiec, Poland
| | - Beata Szulc-Musioł
- Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Kasztanowa Str. 3, 41-200 Sosnowiec, Poland;
| |
Collapse
|
9
|
Boateng ID. A critical review of Ginkgolic acid in Ginkgo biloba leaves extract (EGb). Toxicity, technologies to remove the ginkgolic acids and its promising bioactivities. Food Funct 2022; 13:9226-9242. [DOI: 10.1039/d2fo01827f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ginkgo biloba leaves extract (EGb) is high in bioactive components (over 170), which are used in food additives, medicine, cosmetics, health products, and other sectors. Nonetheless, ginkgolic acids (GAs) in...
Collapse
|
10
|
Hormesis and Ginkgo biloba (GB): Numerous biological effects of GB are mediated via hormesis. Ageing Res Rev 2020; 64:101019. [PMID: 31931153 DOI: 10.1016/j.arr.2020.101019] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/27/2019] [Accepted: 01/09/2020] [Indexed: 01/11/2023]
Abstract
Ginkgo biloba (GB) extracts have been shown to commonly induce biphasic dose responses in a range of cell types and endpoints (e.g., cochlea neural stem cells, cell viability, cell proliferation). The magnitude and width of the low dose stimulation of these biphasic dose responses are similar to those reported for hormetic dose responses. These hormetic dose responses occur within direct stimulatory responses as well as in preconditioning experimental protocols, displaying acquired resistance within an adaptive homeodynamic and temporal framework and repeated measurement protocols. The demonstrated GB dose responses further reflect the general occurrence of hormetic dose responses that consistently appear to be independent of the biological model, endpoint, inducing agent, and/or mechanism. These findings have important implications for consideration(s) of study designs involving dose selection, dose spacing, sample size, and statistical power. This illustrates and strengthens the need to characterize the low dose stimulatory response range and optimal dose in order to explore potential public health and clinical applications of plant-derived agents, such as GB.
Collapse
|
11
|
Chikezie PC, Ekeanyanwu RC, Chile-Agada AB. Phytocomponents from Anacardium occidentale, Psidium guajava, and Terminalia catappa altered membrane osmotic stability of sickle erythrocytes. BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES 2020. [DOI: 10.1186/s43088-019-0030-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Abstract
Background
The present study identified, quantified, and characterized the combinations of phytocomponents from fractionated leaf extracts of Anacardium occidentale, Psidium guajava, and Terminalia catappa that stabilized sickle erythrocyte membrane against osmotic stress, or otherwise, using standard chromatographic-spectrophotometric techniques, namely GC-MS, FT-IR, and UV-visible systems.
Results
The percentage hemolysis of the control sample, in 0.9 g/100 mL NaCl, was 35.08 ± 11.64%, whereas those of the samples containing 40 mg/100 mL, 60 mg/100 mL, and 80 mg/100 mL of ethylacetate extracts of T. catappa ranged between 31.82 ± 8.32 and 39.18 ± 6.94%. Ethylacetate extract of T. catappa contained comparative high quantities of hexadecanoic acid methyl ester, 9,11-octadecadienoic acid, methyl ester, (E, E)-, trans-13-octadecenoic acid methyl ester, and methyl stearate. FT-IR and UV-visible spectra showed that ethylacetate extract of T. catappa contained aromatic compounds as well as nitro-compounds, phenolics, and esters.
Conclusion
To mention but a few, the combinations of major phytocomponents that stabilized sickle erythrocyte membrane against osmotic stress were hexadecanoic acid, methyl ester, 11-octadecenoic acid, methyl ester, dibutyl phthalate, pentacosane, trans-13-octadecenoic acid, methyl ester, whereas the minor phytocomponents include methyl tetradecanoate, methoxyacetic acid, 3-pentadecyl ester, methyl stearate, hexadecanoic acid, isoxazole, 4,5-dimethyl-.
Collapse
|
12
|
Oliveira D, Latimer C, Parpot P, Gill CIR, Oliveira R. Antioxidant and antigenotoxic activities of Ginkgo biloba L. leaf extract are retained after in vitro gastrointestinal digestive conditions. Eur J Nutr 2019; 59:465-476. [PMID: 30721412 DOI: 10.1007/s00394-019-01915-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 01/25/2019] [Indexed: 10/27/2022]
Abstract
PURPOSE The recognized biological properties of Ginkgo biloba extracts potentiate their utilization as an ingredient for functional foods. However, the digestive conditions can affect the chemical composition of the extracts and consequently their biological properties, which can lead to food safety problems. Thus, the impact of in vitro-simulated upper gastrointestinal tract digestion on the chemical composition and bioactivity of Ginkgo biloba leaf extract (GBE) was evaluated. METHODS Physicochemical conditions of human digestion were simulated in vitro, and its impact on the chemical composition of GBE was investigated by electrospray ionization-mass spectrometry. The persistence of bioactivity was investigated by subjecting GBE and the in vitro digested extract (DGBE) to the same methodology. Antioxidant properties were assessed using 2',7'-dichlorofluorescein diacetate to measure the intracellular oxidation of Schizosaccharomyces pombe cells pre-incubated with GBE or DGBE and exposed to H2O2. Antigenotoxicity was tested by comet assay in HT-29 colon cancer cells pre-incubated with GBE or DGBE and challenged with H2O2. RESULTS The chemical analysis revealed a considerable change in chemical composition upon digestion. Pre-incubation with GBE or DGBE attenuated the H2O2-imposed intracellular oxidation in wild-type S. pombe cells, unlike the oxidative stress response-affected mutants sty1 and pap1, and decreased H2O2-induced DNA damage in HT-29 cells. The extracts did not induce toxicity in these eukaryotic models. CONCLUSION The chemical composition of GBE was affected by in vitro digestion, but the antioxidant and antigenotoxic activities persisted. Therefore, G. biloba extract may be suitable for use as food additive and contribute to a healthy colon.
Collapse
Affiliation(s)
- Daniela Oliveira
- Department of Biology, Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal
| | - Cheryl Latimer
- Nutrition Innovation Centre for Food and Health, Centre for Molecular Biosciences, University of Ulster, Cromore Road, Coleraine, Northern Ireland, BT52 1SA, UK
| | - Pier Parpot
- Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.,Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal
| | - Chris I R Gill
- Nutrition Innovation Centre for Food and Health, Centre for Molecular Biosciences, University of Ulster, Cromore Road, Coleraine, Northern Ireland, BT52 1SA, UK
| | - Rui Oliveira
- Department of Biology, Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal. .,Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.
| |
Collapse
|
13
|
The protective effect of two commercial formats of Ginkgo biloba on motor alterations induced by cassava juice ( Manihot esculenta Crantz) in Wistar rats. NEUROLOGÍA (ENGLISH EDITION) 2017. [DOI: 10.1016/j.nrleng.2016.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
14
|
Lin L, Huang J, Sun-Waterhouse D, Zhao M, Zhao K, Que J. Maca (Lepidium meyenii) as a source of macamides and polysaccharide in combating of oxidative stress and damage in human erythrocytes. Int J Food Sci Technol 2017. [DOI: 10.1111/ijfs.13586] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Lianzhu Lin
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center; Guangzhou 510640 China
| | - Jiayi Huang
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Dongxiao Sun-Waterhouse
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center; Guangzhou 510640 China
| | - Mouming Zhao
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center; Guangzhou 510640 China
- Beijing Advanced Innovation Center for Food Nutrition and Human Health; Beijing Technology & Business University; Beijing 100048 China
| | - Kun Zhao
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center; Guangzhou 510640 China
| | - Junjie Que
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center; Guangzhou 510640 China
| |
Collapse
|
15
|
Intracellular antioxidant activities of selected cereal phenolic extracts and mechanisms underlying the protective effects of adlay phenolic extracts on H 2 O 2 -induced oxidative stress in human erythrocytes. J Funct Foods 2017. [DOI: 10.1016/j.jff.2017.01.046] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
16
|
Mei N, Guo X, Ren Z, Kobayashi D, Wada K, Guo L. Review of Ginkgo biloba-induced toxicity, from experimental studies to human case reports. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2017; 35:1-28. [PMID: 28055331 PMCID: PMC6373469 DOI: 10.1080/10590501.2016.1278298] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Ginkgo biloba seeds and leaves have been used as a traditional herbal remedy for thousands of years, and its leaf extract has been consumed as a botanical dietary supplement for decades. Ginkgo biloba extract is a complex mixture with numerous components, including flavonol glycosides and terpene lactones, and is one of the most widely sold botanical dietary supplements worldwide. Concerns about potential health risks for the general population have been raised because of the widespread human exposure to Ginkgo biloba and its potential toxic and carcinogenic activities in rodents. The National Toxicology Program conducted 2-year gavage studies on one Ginkgo biloba leaf extract and concluded that there was clear evidence of carcinogenic activity of this extract in mice based on an increased incidence of hepatocellular carcinoma and hepatoblastoma. Recently, Ginkgo biloba leaf extract has been classified as a possible human carcinogen (Group 2B) by the International Agency for Research on Cancer. This review presents updated information on the toxicological effects from experimental studies both in vitro and in vivo to human case reports (caused by ginkgo seeds or leaves), and also summarizes the negative results from relatively large clinical trials.
Collapse
Affiliation(s)
- Nan Mei
- a Division of Genetic and Molecular Toxicology , National Center for Toxicological Research , Jefferson , Arkansas , USA
| | - Xiaoqing Guo
- a Division of Genetic and Molecular Toxicology , National Center for Toxicological Research , Jefferson , Arkansas , USA
| | - Zhen Ren
- b Division of Biochemical Toxicology , National Center for Toxicological Research , Jefferson , Arkansas , USA
| | - Daisuke Kobayashi
- c Department of Food and Chemical Toxicology , Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido , Hokkaido , Japan
| | - Keiji Wada
- c Department of Food and Chemical Toxicology , Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido , Hokkaido , Japan
| | - Lei Guo
- b Division of Biochemical Toxicology , National Center for Toxicological Research , Jefferson , Arkansas , USA
| |
Collapse
|
17
|
Sutili FJ, Velasquez A, Pinheiro CG, Heinzmann BM, Gatlin DM, Baldisserotto B. Evaluation of Ocimum americanum essential oil as an additive in red drum (Sciaenops ocellatus) diets. FISH & SHELLFISH IMMUNOLOGY 2016; 56:155-161. [PMID: 27417228 DOI: 10.1016/j.fsi.2016.07.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 06/28/2016] [Accepted: 07/09/2016] [Indexed: 06/06/2023]
Abstract
This study evaluated productive parameters, whole-body composition, non-specific immune responses and pH and microbiota of digestive tract contents of red drum (Sciaenops ocellatus) fed diets supplemented with Ocimum americanum essential oil (OAEO) (0 - control, 0.25, 0.5, 1.0 and 2.0 g/kg diet). After 7 weeks no significant differences in productive parameters and whole-body composition were observed. Plasma and intestinal lysozyme measurements and pH of the stomach and intestine (6 h after feeding) did not show significant differences among groups. Intestinal microbial community in fish fed the basal and OAEO diets (all concentrations) were identical. However, red drum fed the diet with OAEO at 1.0 g/kg had significantly increased intraperitoneal fat deposition and stomach pH (2 h after feeding) and decreased superoxide ion production (NBT-test) compared to the control group. Hemolytic activity of the complement system increased in fish fed diets containing OAEO. Red blood cells from fish fed the lowest OAEO concentration (0.25 g/kg) showed significant lower fragility in erythrocyte osmotic fragility assay, but fish fed 0.5 and 1.0 g/kg showed significant higher erythrocyte fragility. Lysozyme measurement in the supernatant of stomach content was significantly higher in fish fed the diet supplemented at 0.5 g/kg. Based on these various results, OAEO at different supplementation levels did not influence growth performance and intestinal microbial community; however, the EO added to the diet showed effects on immunological responses of red drum.
Collapse
Affiliation(s)
- Fernando J Sutili
- CAPES Foundation, Ministry of Education of Brazil, Brasília, DF, 70040-020, Brazil; Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Alejandro Velasquez
- Department of Wildlife and Fisheries Sciences, Texas A&M University System, College Station, TX, 77843-2258, USA
| | - Carlos G Pinheiro
- Department of Industrial Pharmacy, Federal University of Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Berta M Heinzmann
- Department of Industrial Pharmacy, Federal University of Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Delbert M Gatlin
- Department of Wildlife and Fisheries Sciences, Texas A&M University System, College Station, TX, 77843-2258, USA
| | - Bernardo Baldisserotto
- Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, 97105-900, Brazil.
| |
Collapse
|
18
|
Activity of essential oils of Piper aduncum anf and Cinnamomum zeylanicum by evaluating osmotic and morphologic fragility of erythrocytes. Eur J Integr Med 2016. [DOI: 10.1016/j.eujim.2016.02.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
19
|
Rivadeneyra-Domínguez E, Vázquez-Luna A, Rodríguez-Landa JF, Mérida-Portilla CV, Díaz-Sobac R. The protective effect of two commercial formats of Ginkgo biloba on motor alterations induced by cassava juice (Manihot esculenta Crantz) in Wistar rats. Neurologia 2016; 32:516-522. [PMID: 27130308 DOI: 10.1016/j.nrl.2016.02.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 02/27/2016] [Indexed: 12/30/2022] Open
Abstract
INTRODUCTION This study evaluated the protective effects of 2 commercial formats of Ginkgo biloba on motor alterations induced by cassava (Manihot esculenta Crantz) juice consumption in male Wistar rats. METHODS The effects were evaluated with the open field and swim tests at 0, 7, 14, 21, and 28 days of treatment, one hour after administering the product. RESULTS Compared to controls, open field crossings increased after day 21 of cassava juice consumption, and lateral swimming in the swim test was reported after day 7. CONCLUSION Ginkgo biloba extracts prevented motor alterations associated with cassava juice consumption, probably due to the flavonoid content in both formats of Ginkgo biloba.
Collapse
Affiliation(s)
- E Rivadeneyra-Domínguez
- Laboratorio de Farmacotoxicología, Facultad de Química Farmacéutica Biológica, Universidad Veracruzana, Xalapa, Veracruz, México.
| | - A Vázquez-Luna
- Laboratorio de Farmacotoxicología, Facultad de Química Farmacéutica Biológica, Universidad Veracruzana, Xalapa, Veracruz, México; Laboratorio de Biología y Química Molecular de Frutas, Instituto de Ciencias Básicas, Universidad Veracruzana, Xalapa, Veracruz, México
| | - J F Rodríguez-Landa
- Laboratorio de Farmacotoxicología, Facultad de Química Farmacéutica Biológica, Universidad Veracruzana, Xalapa, Veracruz, México; Instituto de Neuroetología, Universidad Veracruzana, Xalapa, Veracruz, México
| | - C V Mérida-Portilla
- Laboratorio de Farmacotoxicología, Facultad de Química Farmacéutica Biológica, Universidad Veracruzana, Xalapa, Veracruz, México
| | - R Díaz-Sobac
- Laboratorio de Farmacotoxicología, Facultad de Química Farmacéutica Biológica, Universidad Veracruzana, Xalapa, Veracruz, México; Laboratorio de Biología y Química Molecular de Frutas, Instituto de Ciencias Básicas, Universidad Veracruzana, Xalapa, Veracruz, México
| |
Collapse
|
20
|
Duarte AE, Waczuk EP, Roversi K, da Silva MAP, Barros LM, da Cunha FAB, de Menezes IRA, da Costa JGM, Boligon AA, Ademiluyi AO, Kamdem JP, Rocha JBT, Burger ME. Polyphenolic Composition and Evaluation of Antioxidant Activity, Osmotic Fragility and Cytotoxic Effects of Raphiodon echinus (Nees & Mart.) Schauer. Molecules 2015; 21:E2. [PMID: 26729080 PMCID: PMC6273766 DOI: 10.3390/molecules21010002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Revised: 12/08/2015] [Accepted: 12/09/2015] [Indexed: 01/28/2023] Open
Abstract
Raphiodon echinus (R. echinus) is used in Brazilian folk medicine for the treatment of inflammation, coughs, and infectious diseases. However, no information is available on the potential antioxidant, cytotoxicity and genotoxicity of this plant. In this study, the polyphenolic constituents, antioxidant capacity and potential toxic effects of aqueous and ethanolic extracts of R. echinus on human erythrocytes and leukocytes were investigated for the first time. R. echinus extracts showed the presence of Gallic, chlorogenic, caffeic and ellagic acids, rutin, quercitrin and quercetin. Aqueous and ethanolic extracts of R. echinus exhibited antioxidant activity in DPPH radical scavenging with IC50 = 111.9 μg/mL (EtOH extract) and IC50 = 227.9 μg/mL (aqueous extract). The extracts inhibited Fe(2+) (10 μM) induced thiobarbituric acid reactive substances (TBARS) formation in rat brain and liver homogenates. The extracts (30-480 μg/mL) did not induce genotoxicity, cytotoxicity or osmotic fragility in human blood cells. The findings of this present study therefore suggest that the therapeutic effect of R. echinus may be, in part, related to its antioxidant potential. Nevertheless, further in vitro and in vivo studies are required to ascertain the safety margin of its use in folk medicine.
Collapse
Affiliation(s)
- Antonia Eliene Duarte
- Centro de Ciências Biológicas e da Saúde-CCBS, Departamento de Ciências Biológicas, Universidade Regional do Cariri (URCA), Pimenta, Crato CEP 63.100-000, CE, Brazil.
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Emily Pansera Waczuk
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Katiane Roversi
- Departamento de Fisiologia e Farmacologia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Maria Arlene Pessoa da Silva
- Laboratório de Botânica Aplicada, Departamento de Ciências Biológicas, Universidade Regional do Cariri (URCA), Pimenta, Crato CEP 63.100-000, CE, Brazil.
| | - Luiz Marivando Barros
- Centro de Ciências Biológicas e da Saúde-CCBS, Departamento de Ciências Biológicas, Universidade Regional do Cariri (URCA), Pimenta, Crato CEP 63.100-000, CE, Brazil.
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Francisco Assis Bezerra da Cunha
- Centro de Ciências Biológicas e da Saúde-CCBS, Departamento de Ciências Biológicas, Universidade Regional do Cariri (URCA), Pimenta, Crato CEP 63.100-000, CE, Brazil.
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Irwin Rose Alencar de Menezes
- Laboratório de Farmacologia e Química Molecular, Departamento de Química Biológica, Universidade Regional do Cariri, Pimenta, Crato CEP 63.100-000, CE, Brazil.
| | - José Galberto Martins da Costa
- Laboratório de Pesquisas de Produtos Naturais, Departamento de Química Biológica, Universidade Regional do Cariri, Crato CEP 63.105.000, CE, Brazil.
| | - Aline Augusti Boligon
- Laboratório de Fitoquímica, Departamento de Farmácia Industrial, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Adedayo Oluwaseun Ademiluyi
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
- Functional Foods and Nutraceutical Unit, Department of Biochemistry, Federal University of Technology, P.M.B. 704, Akure 340001, Nigeria.
| | - Jean Paul Kamdem
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
- Departamento de Bioquímica, Instituto de Ciências Básica da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre CEP 90035-003, RS, Brazil.
| | - João Batista Teixeira Rocha
- Programa de Pós-Graduação em Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| | - Marilise Escobar Burger
- Departamento de Fisiologia e Farmacologia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
| |
Collapse
|
21
|
Physical Effects of Buckwheat Extract on Biological Membrane In Vitro and Its Protective Properties. J Membr Biol 2015; 249:155-70. [PMID: 26581904 PMCID: PMC4851706 DOI: 10.1007/s00232-015-9857-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 11/03/2015] [Indexed: 11/06/2022]
Abstract
Buckwheat is a valuable source of many biologically active compounds and nutrients. It has properties that reduce blood cholesterol levels, and so reduces the risk of atherosclerosis, seals the capillaries, and lowers blood pressure. The aim of the study was to determine quantitative and qualitative characteristics of polyphenols contained in extracts from buckwheat husks and stalks, the biological activity of the extracts, and biophysical effects of their interaction with the erythrocyte membrane, treated as a model of the cell. An analysis of the extract’s composition has shown that buckwheat husk and stalk extracts are a rich source of polyphenolic compounds, the stalk extracts showing more compounds than the husk extract. The study allowed to determine the location which incorporated polyphenols occupy in the erythrocyte membrane and changes in the membrane properties caused by them. It was found that the extracts do not induce hemolysis of red blood cells, causing an increase in osmotic resistance of erythrocytes. They affect mainly the hydrophilic region by changing the degree of order of the polar heads of lipids, but do little to change the fluidity of the membrane and its hydration. The results showed also that polyphenolic substances included in the extracts well protect the membranes of red blood cells against oxidation and exhibit anti-inflammatory effect.
Collapse
|
22
|
Cyboran S, Strugała P, Włoch A, Oszmiański J, Kleszczyńska H. Concentrated green tea supplement: biological activity and molecular mechanisms. Life Sci 2015; 126:1-9. [PMID: 25703070 DOI: 10.1016/j.lfs.2014.12.025] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 11/05/2014] [Accepted: 12/17/2014] [Indexed: 01/18/2023]
Abstract
AIM This study was undertaken to determine the biological activity of a green tea supplement with respect to cells and erythrocyte membranes and the molecular mechanism of that activity. MAIN METHODS The extract's activity was evaluated on the basis of its hemolytic, antioxidant and antiinflammatory actions. In addition, the extract's effect on the physical properties of the erythrocyte membrane was examined. We also conducted a detailed analysis of supplement ingredients using high-yield liquid chromatography, supplemented with standard tests of total content of polyphenols and flavonoids in the supplement. KEY FINDINGS The study showed that green tea extract has a high antioxidant and anti-inflammatory capacity with no deleterious effect on red blood cells. The extract modifies the physical properties of the erythrocyte membrane, apparently by binding to its hydrophilic region, with consequent rigidity of the hydrophobic region, increased hydration and a moderate increase in its resistance to changes in tonicity of the medium. Because the extract's components anchor in the polar region of membrane lipids, they are able to effectively scavenge free radicals in the immediate vicinity of the membrane and hinder their diffusion into its interior. SIGNIFICANCE Green tea supplement at concentrations markedly exceeding the blood plasma physiological polyphenol concentrations has no destructive effect on the erythrocyte membrane. Due to the high content of flavan-3-ols, the supplement exhibits high biological activity, which makes it an alternative source of those substances to the commonly used infusion of green tea leaves.
Collapse
Affiliation(s)
- S Cyboran
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland.
| | - P Strugała
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - A Włoch
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - J Oszmiański
- Department of Fruit, Vegetable and Cereal Technology, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - H Kleszczyńska
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| |
Collapse
|
23
|
Zhang D, Li H, Wang JB. Echinacoside inhibits amyloid fibrillization of HEWL and protects against Aβ-induced neurotoxicity. Int J Biol Macromol 2015; 72:243-53. [DOI: 10.1016/j.ijbiomac.2014.08.034] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 08/08/2014] [Accepted: 08/10/2014] [Indexed: 01/23/2023]
|
24
|
Lin H, Guo X, Zhang S, Dial SL, Guo L, Manjanatha MG, Moore MM, Mei N. Mechanistic evaluation of Ginkgo biloba leaf extract-induced genotoxicity in L5178Y cells. Toxicol Sci 2014; 139:338-49. [PMID: 24595819 DOI: 10.1093/toxsci/kfu037] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Ginkgo biloba has been used for many thousand years as a traditional herbal remedy and its extract has been consumed for many decades as a dietary supplement. Ginkgo biloba leaf extract is a complex mixture with many constituents, including flavonol glycosides and terpene lactones. The National Toxicology Program 2-year cancer bioassay found that G. biloba leaf extract targets the liver, thyroid gland, and nose of rodents; however, the mechanism of G. biloba leaf extract-associated carcinogenicity remains unclear. In the current study, the in vitro genotoxicity of G. biloba leaf extract and its eight constituents was evaluated using the mouse lymphoma assay (MLA) and Comet assay. The underlying mechanisms of G. biloba leaf extract-associated genotoxicity were explored. Ginkgo biloba leaf extract, quercetin, and kaempferol resulted in a dose-dependent increase in the mutant frequency and DNA double-strand breaks (DSBs). Western blot analysis confirmed that G. biloba leaf extract, quercetin, and kaempferol activated the DNA damage signaling pathway with increased expression of γ-H2AX and phosphorylated Chk2 and Chk1. In addition, G. biloba leaf extract produced reactive oxygen species and decreased glutathione levels in L5178Y cells. Loss of heterozygosity analysis of mutants indicated that G. biloba leaf extract, quercetin, and kaempferol treatments resulted in extensive chromosomal damage. These results indicate that G. biloba leaf extract and its two constituents, quercetin and kaempferol, are mutagenic to the mouse L5178Y cells and induce DSBs. Quercetin and kaempferol likely are major contributors to G. biloba leaf extract-induced genotoxicity.
Collapse
Affiliation(s)
- Haixia Lin
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, Jefferson, Arkansas 72079
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Harisa GI. Naringin mitigates erythrocytes aging induced by paclitaxel: an in vitro study. J Biochem Mol Toxicol 2013; 28:129-36. [PMID: 24375949 DOI: 10.1002/jbt.21544] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 11/05/2013] [Accepted: 11/24/2013] [Indexed: 02/02/2023]
Abstract
In this study, the protective role of naringin (NAR) against paclitaxel (PTX)-induced erythrocytes aging has been investigated using human erythrocyte as an in vitro model. Erythrocytes were incubated with PTX in the presence and absence of NAR. Incubation of erythrocytes with PTX resulted in increased protein carbonyl content and malondialdehyde and hemolysis percentage compared with control. Furthermore, a significant increase in the ratios of glutathione peroxidase/glutathione reductase, superoxide dismutase/glutathione peroxidase, and superoxide dismutase/catalase in PTX-treated cells was observed, compared with control cells. In contrast, reduced glutathione/oxidized glutathione ratio and glucose-6-phosphate dehydrogenase activity were decreased upon PTX treatment. The simultaneous incubation of erythrocytes with PTX and NAR restored these variables to values similar to those of control erythrocytes. These results suggest that NAR inhibited PTX-induced aging by lessening the PTX-induced oxidative stress.
Collapse
Affiliation(s)
- Gamaleldin I Harisa
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia; Department of Biochemistry, College of Pharmacy, Al-Azhar University (Boys), Nasr City, Cairo, Egypt.
| |
Collapse
|
26
|
Shevchenko OG, Plyusnina SN, Shishkina LN, Chukicheva IY, Fedorova IV, Kuchin AV. Membrane-protective properties of isobornylphenols-a new class of antioxidants. BIOCHEMISTRY MOSCOW SUPPLEMENT SERIES A-MEMBRANE AND CELL BIOLOGY 2013. [DOI: 10.1134/s1990747812060062] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
27
|
Zhao L, Chen J, Su J, Li L, Hu S, Li B, Zhang X, Xu Z, Chen T. In vitro antioxidant and antiproliferative activities of 5-hydroxymethylfurfural. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:10604-11. [PMID: 24107143 DOI: 10.1021/jf403098y] [Citation(s) in RCA: 150] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
5-HMF is widely presented in foods and produced through the degradation of hexoses and Maillard reaction during heat treatment of foods containing reducing sugars and amino acids in an acid environment. However, controversial conclusions on the biological effects of 5-HMF have been drawn in previous studies. Therefore, the main aim of this study was to investigate the antioxidant and antiproliferative activities of 5-HMF. The 2,2'-azinobis-3-ethylbenzothiazolin-6-sulfonic acid (ABTS) assay, the 1,1-diphenyl-2-picryhydrazyl (DPPH) assay, and the hemolysis assay induced by 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH) were performed to evaluate the antioxidant capacity of 5-HMF. The results showed that 5-HMF exhibited novel antioxidant activity by scavenging the ABTS and DPPH free radicals and inhibited the AAPH-induced hemolysis in a dose-dependent manner. In the hemolysis assay, the reduction of ROS and MDA contents and the increase in enzyme activities of SOD, CAT, and GPx were found in erythrocytes pretreated with 5-HMF, which demonstrated that 5-HMF could prevent the peroxidation from the source to protect the erythrocytes. The morphological changes of erythrocytes was also verified by observation using atomic force microscopy. The inhibitory effect of 5-HMF on human cancer cell proliferation was investigated by MTT assay, flow cytometric analysis, and the TUNEL and DAPI costaining assay. The results showed that 5-HMF displayed higher antiproliferative activity on human melanoma A375 cells than other cell lines. Further investigation on the action mechanisms revealed that 5-HMF could induce A375 cell apoptosis and G0/G1 cell cycle arrest. The A375 cell apoptosis that 5-HMF induced was characterized by a TUNEL and DAPI costaining assay. These findings suggest that 5-HMF could be developed as a novel natural antioxidant with potential applications in cancer chemoprevention.
Collapse
Affiliation(s)
- Ling Zhao
- College of Light Industry and Food Sciences, South China University of Technology , Wu Shan Road 381, Guangzhou 510640, China
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Dicarboxylic acids with limited numbers of hydrocarbons stabilize cell membrane and increase osmotic resistance in rat erythrocytes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:2379-84. [DOI: 10.1016/j.bbamem.2013.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/31/2013] [Accepted: 06/05/2013] [Indexed: 11/23/2022]
|
29
|
Heinrich J, Valentová K, Vacek J, Palíková I, Zatloukalová M, Kosina P, Ulrichová J, Vrbková J, Šimánek V. Metabolic profiling of phenolic acids and oxidative stress markers after consumption of Lonicera caerulea L. fruit. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:4526-4532. [PMID: 23581742 DOI: 10.1021/jf304150b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study investigated the effect of one-week consumption of 165 g/day fresh blue honeysuckle berries (208 mg/day anthocyanins) in 10 healthy volunteers. At the end of intervention, levels of benzoic (median 1782 vs 4156), protocatechuic (709 vs 2417), vanillic (2779 vs 4753), 3-hydroxycinnamic (143 vs 351), p-coumaric (182 vs 271), isoferulic (805 vs 1570), ferulic (1086 vs 2395), and hippuric (194833 vs 398711 μg/mg creatinine) acids by LC/MS were significantly increased in the urine. Clinical chemistry safety markers were not altered. Oxidative stress markers, erythrocyte glutathione peroxidase (0.73 vs 0.88 U/g Hb) and catalase (2.5 vs 2.8 μkat/g Hb) activities, and erythrocyte/plasma thiobarbituric acid reactive substance (522 vs 612/33 vs 38 μmol/g Hb/protein) levels were significantly increased, without change in plasma antioxidant status. Nonsignificant changes of advanced oxidation protein products and oxidized LDL were observed. The results provide a solid base for further study of metabolite excretion and antioxidant parameters after ingestion of anthocyanins.
Collapse
Affiliation(s)
- Jan Heinrich
- Department of Medical Chemistry and Biochemistry, Palacký University, Hněvotínská 3, 775 15 Olomouc, Czech Republic
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Lai SW, Chen JH, Kao WY. Acute hemolytic anemia in glucose-6-phosphate dehydrogenase deficiency complicated by Ginkgo biloba. Acta Haematol 2013; 130:288-90. [PMID: 23970095 DOI: 10.1159/000350599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 03/04/2013] [Indexed: 11/19/2022]
Abstract
We report on a patient with glucose-6-phosphate dehydrogenase (G6PD) deficiency who developed acute hemolytic anemia after having received an injection of Ginkgo biloba for dementia prophylaxis without medical advice. She suddenly developed general malaise, generalized yellowish skin color, and tea-colored urine. Intravenous fluid infusion and cessation of G. biloba quickly relieved her clinical symptoms. To the best of our knowledge, this is the first case report of G. biloba-induced acute hemolytic anemia in vivo.
Collapse
Affiliation(s)
- Shiue-Wei Lai
- Division of Hematology-Oncology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | | | | |
Collapse
|
31
|
Furman AEF, Henneberg R, Hermann PB, Leonart MSS, Nascimento AJD. Ginkgo biloba extract (EGb 761) attenuates oxidative stress induction in erythrocytes of sickle cell disease patients. BRAZ J PHARM SCI 2012. [DOI: 10.1590/s1984-82502012000400009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Sickle cell disease promotes hemolytic anemia and occlusion of small blood vessels due to the presence of high concentrations of hemoglobin S, resulting in increased production of reactive oxygen species and decreased antioxidant defense capacity. The aim of this study was to evaluate the protective action of a standardized extract of Ginkgo biloba (EGb 761), selected due to its high content of flavonoids and terpenoids, in erythrocytes of patients with sickle cell anemia (HbSS, SS erythrocytes) subjected to oxidative stress using tert-butylhydroperoxide or 2,2-azobis-(amidinepropane)-dihydrochloride, in vitro. Hemolysis indexes, reduced glutathione, methemoglobin concentrations, lipid peroxidation, and intracellular reactive oxygen species were determined. SS erythrocytes displayed increased rates of oxidation of hemoglobin and membrane lipid peroxidation compared to normal erythrocytes (HbAA, AA erythrocytes), and the concentration of EGb 761 necessary to achieve the same antioxidant effect in SS erythrocytes was at least two times higher than in normal ones, inhibiting the formation of intracellular reactive oxygen species (IC50 of 13.6 µg/mL), partially preventing lipid peroxidation (IC50 of 242.5 µg/mL) and preventing hemolysis (IC50 of 10.5 µg/mL). Thus, EGb 761 has a beneficial effect on the oxidative status of SS erythrocytes. Moreover, EGb 761 failed to prevent oxidation of hemoglobin and reduced glutathione at the concentrations examined.
Collapse
|
32
|
Fan C, Jiang J, Yin X, Wong KH, Zheng W, Chen T. Purification of selenium-containing allophycocyanin from selenium-enriched Spirulina platensis and its hepatoprotective effect against t-BOOH-induced apoptosis. Food Chem 2012. [DOI: 10.1016/j.foodchem.2012.02.130] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
33
|
Wang JB, Wang YM, Zeng CM. Quercetin inhibits amyloid fibrillation of bovine insulin and destabilizes preformed fibrils. Biochem Biophys Res Commun 2011; 415:675-9. [PMID: 22079288 DOI: 10.1016/j.bbrc.2011.10.135] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 10/28/2011] [Indexed: 12/30/2022]
Abstract
Growing interest and research efforts have recently been focused on elucidating the molecular mechanism of amyloid formation and the screening of effective inhibitors to interrupt amyloid structures. In the present study, the anti-amyloidogenic effects of quercetin were investigated in vitro using bovine insulin as a model protein. The results demonstrated that quercetin dose-dependently inhibited amyloid formation of insulin. Moreover, quercetin destabilized the preformed insulin fibrils and transformed the fibrils into amorphous aggregates. Hemolysis was observed when human erythrocytes were co-incubated with insulin fibrils. Quercetin inhibited fibril-induced hemolysis in a dose-dependent manner. SDS-PAGE showed that insulin fibrils induced the aggregation of cytoskeletal proteins of erythrocyte membranes and that quercetin attenuated this fibril-induced cytoskeletal aggregation. The results of the present work suggest that quercetin may serve as a lead structure for the design of novel anti-amyloidogenic drugs.
Collapse
Affiliation(s)
- Jian-Bo Wang
- College of Life Science, Shaanxi Normal University, Xi'an 710062, China
| | | | | |
Collapse
|
34
|
Fisetin induces apoptosis in human cervical cancer HeLa cells through ERK1/2-mediated activation of caspase-8-/caspase-3-dependent pathway. Arch Toxicol 2011; 86:263-73. [DOI: 10.1007/s00204-011-0754-6] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Accepted: 09/14/2011] [Indexed: 10/17/2022]
|
35
|
Green tea polyphenol epigallocatechin-3-gallate (EGCG) induced intermolecular cross-linking of membrane proteins. Arch Biochem Biophys 2011; 507:343-9. [PMID: 21211509 DOI: 10.1016/j.abb.2010.12.033] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2010] [Revised: 12/29/2010] [Accepted: 12/29/2010] [Indexed: 11/23/2022]
Abstract
Increasing evidence has demonstrated that EGCG possesses prooxidant potential in biological systems, including modifying proteins, breaking DNA strands and inducing the generation of reactive oxygen species. In the present study, the prooxidant effect of EGCG on erythrocyte membranes was investigated. SDS-PAGE and NBT-staining assay were utilized to detect the catechol-protein adducts that generated upon treating the membranes with EGCG. The results indicated that EGCG was able to bind covalently to sulfhydryl groups of membrane proteins, leading to the formation of protein aggregates with intermolecular cross-linking. We suggested that the catechol-quinone originated from the oxidation of EGCG acted as a cross-linker on which peptide chains were combined through thiol-S-alkylation at the C2- and C6-sites of the gallyl ring. EGC showed similar effects as EGCG on the ghost membranes, whereas ECG and EC did not, suggesting that a structure with a gallyl moiety is a prerequisite for a catechin to induce the aggregation of membrane proteins and to deplete membrane sulfhydryls. EDTA and ascorbic acid inhibited the EGCG-induced aggregation of membrane proteins by blocking the formation of catechol-quinone. The information of the present study may provide a fresh insight into the prooxidant effect and cytotoxicity of tea catechins.
Collapse
|
36
|
Kim JY, Jeon YK, Jeon W, Nam MJ. Fisetin induces apoptosis in Huh-7 cells via downregulation of BIRC8 and Bcl2L2. Food Chem Toxicol 2010; 48:2259-64. [DOI: 10.1016/j.fct.2010.05.058] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Revised: 04/29/2010] [Accepted: 05/19/2010] [Indexed: 02/08/2023]
|
37
|
Wang CG, Dai Y, Li DL, Ma KY. Ginkgo biloba leaf extract action in scavenging free radicals and reducing mutagenicity and toxicity of cigarette smoke in vivo. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2010; 45:498-505. [PMID: 20390896 DOI: 10.1080/10934520903538707] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this study, ginkgo biloba leaf extract (GBE) was added to sample cigarettes, including in the filter (0.8 mg/cigarette) and/or the cut filler (0.8 mg/cigarette). The effects of GBE in scavenging free radicals and reducing mutagenicity and toxicity of cigarette smoke in vivo were investigated. Smoke analysis results indicated that GBE eliminated up to 30% of free radicals. Biological experiments, conducted for both GBE cigarettes and control samples, included the Ames test, acute toxicity, neutral red cytotoxicity assay and chronic toxicity. Results showed that the mutagenicity and toxicity of the GBE cigarettes were lower than for the control cigarettes. A possible mechanism of GBE in scavenging free radicals is discussed in this article.
Collapse
Affiliation(s)
- Chang G Wang
- Technical Research Center, Chuanyu Branch of China Tobacco Corporation, Chengdu, PR China.
| | | | | | | |
Collapse
|
38
|
Berger J. New Haemolytic Potential Assay on an Alternative Insect Model. Basic Clin Pharmacol Toxicol 2009; 105:315-8. [DOI: 10.1111/j.1742-7843.2009.00446.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|