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1.
J Agric Food Chem ; 67(38): 10553-10562, 2019 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-31490076

RESUMO

Chlorpyrifos (CPF) is a widely used organophosphorus pesticide and detected frequently in fruits, vegetables, as well as in urine and blood in humans. Studies have suggested that CPF can induce metabolic disruption, such as type-2 diabetes mellitus and changed body weight. The main mechanisms are based on oxidative damage, fatty-acid synthesis, and lipid peroxidation. Studies have also shown that CPF can change reproductive hormone (RH) levels. CPF might result in metabolic disorders through altered RH levels. Here, we review the studies showing that CFP causes metabolic disruption. Then, we present the studies showing that CFP changes RH levels. Finally, we discuss a potential pathway of how CPF elicits metabolic disruption.


Assuntos
Clorpirifos/toxicidade , Hormônios Gonadais/metabolismo , Inseticidas/toxicidade , Doenças Metabólicas/metabolismo , Animais , Humanos , Peroxidação de Lipídeos , Doenças Metabólicas/etiologia
2.
Chin J Physiol ; 62(4): 148-156, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31535630

RESUMO

The purpose of this study was to investigate the effect of alcohol exposure on liver and kidney antioxidant systems in taurine exhibition during different time periods. Mice were divided into groups: I - control; II - alcohol (2.5 g/kg b.w.); III - taurine (42.84 mg/kg b.w.); and IV - alcohol + taurine. Treatments were provided for 24 h, 14 days, and 56 days. In the liver and kidney of the alcohol group, antioxidant enzyme (superoxide dismutase, catalase, and glutathione peroxidase) activities, reduced glutathione (GSH), and malondialdehyde (MDA) levels were decreased, as compared to the control group in all time periods. Taurine was found to be effectively inhibiting oxidative action of alcohol and increasing all the tested parameters in the liver (after 24 h) and kidney (after 24 h and 14 days). Moreover, the positive effect of taurine administration on GSH and MDA levels persisted in the kidneys of mice exposed to alcohol for 56 days. In conclusion, alcohol administration led to a significant influence on antioxidant system in the liver and kidney, but simultaneous intake of taurine, along with ethanol, partly attenuated the antioxidant changes in these organs.


Assuntos
Rim , Fígado , Animais , Antioxidantes , Catalase , Etanol , Glutationa , Glutationa Peroxidase , Peroxidação de Lipídeos , Camundongos , Estresse Oxidativo , Ratos Wistar , Superóxido Dismutase , Taurina
3.
Pestic Biochem Physiol ; 158: 135-142, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31378349

RESUMO

Triflumizole is one of imidazole fungicides that works by inhibiting ergosterol biosynthesis, and is widely used for the control of powdery mildew and scabs on various fruits and crops. Triflumizole residue has been frequently detected in soil and aquatic ecosystems. While many studies have focused on its toxic effect on terrestrial and aquatic animals, little attention has been paid to aquatic algae, the primary producers of aquatic environments. Therefore, we evaluated the acute (96 h) toxicity effects of triflumizole on the freshwater algae Chlorella vulgaris, by examining growth, cell morphology, photosynthesis, and oxidative stress. The results showed that the 96 h median inhibition concentration (96 h-EC50) was 0.82 mg/L (95% confidential interval 0.70-0.98 mg/L).The growth of algal cells was conspicuously inhibited by triflumizole exposure, and the cell surfaces appeared to be shrunkThe chlorophyll content (including Chl-a, Chl-b and T-Chl) dramatically decreased at triflumizole concentrations of 0.2 and 1.0 mg/L. In addition, the transcript abundance of photosynthesis-related genes (psaB, psbC and rbcL) showed obvious decreases in above treatments after 96 h of exposure to triflumizole. Moreover, the algal growth inhibition was accompanied by an increase in intracellular reactive oxygen species and malondialdehyde content, as well as increased activity of antioxidant enzymes such as superoxide dismutase and peroxidase, indicating oxidative stress and lipid peroxidation. Our findings reveal that triflumizole has potential toxicity to the primary producers (freshwater algae) in aquatic ecosystems.


Assuntos
Chlorella vulgaris/efeitos dos fármacos , Imidazóis/toxicidade , Estresse Oxidativo/efeitos dos fármacos , Peroxidação de Lipídeos/efeitos dos fármacos , Peroxidase/metabolismo , Fotossíntese/efeitos dos fármacos , Superóxido Dismutase/metabolismo
4.
Pestic Biochem Physiol ; 158: 149-155, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31378351

RESUMO

Induced resistance is an effective measure for controlling plant diseases by utilizing the natural defense of the host and meets the strategic needs of pesticide application and safety for agricultural products worldwide. Ganoderma lucidum polysaccharide (GLP), which is the main active molecule of G. lucidum, has been widely used in functional food and clinical medicine. However, there are few reports of the use of GLP for the prevention and control of plant diseases. The purpose of this study is to explore the effect of GLP and its mechanism of inducing plant resistance. In this study, we found that GLP spray and irrigation root treatments can promote growth in cotton. After soaking in GLP, theseedling height and cotton fusarium wilt resistance both increased to some extent, effects that were dose dependent. After treatment of cotton with GLP, the activities of peroxidase (POD), superoxide dismutase (SOD) and polyphenol oxidase (PPO) in leaves increased significantly, whereas the content of malondialdehyde (MDA) decreased. In addition, QRT-PCR results showed significantly increased relative expression of genes related to the jasmonic acid pathway in cotton. Therefore, we speculate that GLP can induce plant resistance by stimulating the jasmonate pathway.


Assuntos
Fusarium/efeitos dos fármacos , Gossypium/microbiologia , Polissacarídeos/farmacologia , Reishi/química , Antioxidantes/metabolismo , Gossypium/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Malondialdeído/metabolismo , Doenças das Plantas/microbiologia , Polissacarídeos/química , Superóxido Dismutase/metabolismo
5.
Pestic Biochem Physiol ; 158: 25-31, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31378357

RESUMO

Sodium pheophorbide a (SPA) is a natural photosensitizer. To explore its antifungal activity and mechanism, we studied its inhibitory effects on spore germination and mycelial growth of Pestalotiopsis neglecta. We used sorbitol, 2-thiobarbituric acid (TBA) and electron microscopy to determine its effects on cell wall integrity, cell membrane lipid peroxidation and mycelial morphology. Finally, the effects of SPA on enzyme activity in mycelia were determined. The results showed that SPA effectively inhibited spore germination and mycelial growth of P. neglecta under light conditions (4000 lx, 24 h). Scanning electron microscopy (SEM) revealed that SPA treatment resulted in a roughened, twisted and knotted mycelial surface and abnormal mycelial growth. SPA influenced cell wall integrity, and the content of MDA, a cell membrane lipid peroxidation product was significantly increased (P < 0.05). SPA also significantly inhibited SOD, POD and PG activity, but enhanced PPO activity (P < 0.05). In conclusion, SPA may have potential to become a biological pesticide.


Assuntos
Antifúngicos/farmacologia , Clorofila/análogos & derivados , Micélio/efeitos dos fármacos , Radiossensibilizantes/farmacologia , Clorofila/farmacologia , Peroxidação de Lipídeos/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Microscopia Eletrônica de Varredura , Micélio/ultraestrutura
6.
Klin Lab Diagn ; 64(7): 405-408, 2019.
Artigo em Russo | MEDLINE | ID: mdl-31408591

RESUMO

The purpose of the investigation was to study the efficiency of measuring markers of oxidative stress and muscle damage in the oral fluid in highly skilled sportsmen under physical exercise for the assessment of their functional state. 70 highly qualified athletes at the age of 16-20 years specializing in the cyclic kinds of sports (track and field, swimming) took part in the investigation. Sportsmen performed the control test which consisted of the series of 3×100 m distances by a flat race with an active 45 s rest between them for the track and field athletes, and 4×50 m by the main swimming style with an active rest between the distances also for 45 s for the swimmers. Activity of creatine kinase, content of lipid peroxidation products in the blood and oral fluid were measured standard biochemical methods. The performance of the functional tests induces the excessive accumulation of toxic products of lipoperoxidation and increases activity of creatine kinase in the oral fluid of highly qualified athletes. Correlation analysis shows, that the intensity of free radical and peroxide processes in athletes can be evaluated by means of the method of measuring the content of lipid peroxidation products in the oral fluid.


Assuntos
Atletas , Exercício/fisiologia , Peroxidação de Lipídeos , Saliva/química , Creatina Quinase/análise , Humanos , Peróxidos Lipídicos/análise
7.
Kardiologiia ; 59(8): 47-53, 2019 Aug 08.
Artigo em Russo | MEDLINE | ID: mdl-31397229

RESUMO

PURPOSE: to study dynamics of indicators of oxidative stress and their role in development of cardiotoxicity in patients with lympho-proliferative diseases at the background of polychemotherapy. MATERIALS AND METHODS: We included into this study 30 patients with newly detected Non-Hodgkin lymphomas. The control group comprised 15 healthy volunteers. For registration of dynamics of formation of oxygen active forms (OAF), we used highly sensitive chemiluminescence assay. The state of initial stage of lipoperoxidation OAF and radicals of organic compounds) was assessed by dynamics of the leukocyte chemiluminescence. The state of final stage of lipoperoxidation (formation of nonmetabolizing lipid hydroperoxides and other compounds) was assessed by the level of malonic dialdehyde. We also determined indicator of leukocyte chemiluminescence intensity (both basal and zymosan-stimulated). For assessment of the cardiovascular system functional state before and after chemotherapy we used electrocardiography (ECG), echocardiography (EchoCG) and 24-hour ECG monitoring. RESULTS: The data obtained were indicative of increased generation of free radicals by leukocytes during polychemotherapy. After chemotherapy course we detected various types of cardiotoxicity. We noted substantial elevation of frequency of supraventricular and ventricular extrasystoles. There was direct correlation between rate of appearance of supraventricular extrasystoles and level of chemiluminescence of leukocytes (r=0.7; p=0.03). According to data of EchoCG although the left ventricular ejection fraction remained within the normal range during chemotherapy, there was a persistent tendency to its decrease (р<0.001). CONCLUSION: In this study we for the first time in patients with Non-Hodgkin lymphomas detected an elevation of level of free radical reactions and lipid peroxidation with simultaneous lowering of antiperoxidative activity of blood plasma and their relation to development of cardiotoxic effects. The results obtained indicate to necessity of search for novel early markers of oxidative stress activation, myocardial injury and disfunction able to help to substantially decrease risk of development of cardiovascular complications during and after chemotherapy.


Assuntos
Peroxidação de Lipídeos , Estresse Oxidativo , Ecocardiografia , Radicais Livres , Humanos , Função Ventricular Esquerda
8.
Dokl Biochem Biophys ; 486(1): 220-223, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-31367826

RESUMO

Cardiolipin (CL) plays a central role in lipid peroxidation (LPO) of the mitochondrial inner membrane due to higher content of unsaturated fatty acids in CL in comparison with the other phospholipids. CL oxidation plays an important role in the regulation of various intracellular signaling pathways and its excessive oxidation contributes to the development of various pathologies and, possibly, participates in the aging process. Mitochondria-targeted antioxidants containing triphenylphosphonium (TPP+) effectively protect CL from oxidation. It is assumed that fluorescent probes on the basis of the C11-BODIPY fluorophore sensitive to LPO and containing TPP+ can selectively register CL oxidation. To test this possibility, we carried out a molecular dynamic simulation of such probes in a model mitochondrial membrane. It is shown that the probes are located in the membrane at the same depth as the unsaturated bonds in CL molecules sensitive to oxidation. Increasing the length of the linker that binds the fluorophore and TPP+ residue ha little effect on the position of the probe in the membrane. This indicates the possibility of modifying the linker to increase the selectivity of the probes to CL.


Assuntos
Corantes Fluorescentes/metabolismo , Peroxidação de Lipídeos , Membranas Mitocondriais/metabolismo , Simulação de Dinâmica Molecular , Compostos de Boro/metabolismo
9.
Adv Exp Med Biol ; 1155: 463-470, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31468423

RESUMO

We previously reported that taurine treatment inhibited arsenic (As)-induced apoptosis in the liver of mice. This study was designed to explore the effect of taurine on liver function and its underlying mechanism in As-exposed mice. Mice were randomly divided into 3 groups, ten mice in each group. Group 1, control group, only orally received drinking water alone. Group 2, As intoxication group, was exposed to 4 mg/L As2O3 via drinking water for 60 days. Group 3, taurine protection group, was treated with 4 mg/L As2O3 and 150 mg/kg both. Taurine administration significantly revered the increases of alanine transaminase (ALT) and aspartate transaminase (AST) activities in serum. The decrease of glutathione (GSH) was inhibited with taurine treatment in the liver of As-exposed mice. At the same time, taurine significantly inhihibited As-induced enhancement of malondialdehyde (MDA) in the liver. Here we show that taurine protective effect on liver function in As-exposed mice maybe involve lipid peroxidation.


Assuntos
Arsênico/toxicidade , Doença Hepática Induzida por Substâncias e Drogas/tratamento farmacológico , Estresse Oxidativo , Taurina/farmacologia , Alanina Transaminase/sangue , Animais , Antioxidantes/farmacologia , Aspartato Aminotransferases/sangue , Suplementos Nutricionais , Glutationa/análise , Peroxidação de Lipídeos , Fígado/efeitos dos fármacos , Malondialdeído/análise , Camundongos , Distribuição Aleatória
10.
Adv Exp Med Biol ; 1155: 627-641, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31468436

RESUMO

Atrina pectinata (A. pectinata), called pen shell, is an edible shellfish that adheres to the seabed pointed downward and has a triangular shell reaching about 40 cm in length.In this study, we examined the antioxidant effect of an A. pectinata extract exhibiting various radical scavenging activities. These scavenging activities were evaluated using electron spin resonance. Anti-oxidant activities were also determined using the ferric reducing antioxidant power (FRAP) and the ABTS radical scavenging assays. Lipid peroxidation inhibitory activity was confirmed using ferric thiocyanate and thiobarbituric acid assays. Furthermore, the protective effect of the A. pectinata extract against t-BHP-induced oxidative stress on Chang cells were evaluated using MTT assay and the measurement of reactive oxygen species (ROS). These results showed that the A. pectinata extract have strong radical scavenging activities, and exerts protective effect against oxidative stress through reducing intracellular ROS content of Chang cells.


Assuntos
Antioxidantes/farmacologia , Bivalves/química , Extratos Celulares/farmacologia , Estresse Oxidativo , Animais , Linhagem Celular , Humanos , Peroxidação de Lipídeos , Espécies Reativas de Oxigênio/metabolismo
11.
BMC Plant Biol ; 19(1): 323, 2019 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-31319801

RESUMO

BACKGROUND: Exogenous 5-aminolevulinic acid (ALA) positively regulates plants chlorophyll synthesis and protects them against environmental stresses, although the protection mechanism is not fully clear. Here, we explored the effects of ALA on chlorophyll synthesis in tomato plants, which are sensitive to low temperature. We also examined the roles of the glutathione S-transferase (GSTU43) gene, which is involved in ALA-induced tolerance to oxidation stress and regulation of chlorophyll synthesis under low temperature. RESULTS: Exogenous ALA alleviated low temperature caused chlorophyll synthesis obstacle of uroporphyrinogen III (UROIII) conversion to protoporphyrin IX (Proto IX), and enhanced the production of chlorophyll and its precursors, including endogenous ALA, Proto IX, Mg-protoporphyrin IX (Mg-proto IX), and protochlorophyll (Pchl), under low temperature in tomato leaves. However, ALA did not regulate chlorophyll synthesis at the level of transcription. Notably, ALA up-regulated the GSTU43 gene and protein expression and increased GST activity. Silencing of GSTU43 with virus-induced gene silencing reduced the activities of GST, superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase, and increased the membrane lipid peroxidation; while fed with ALA significant increased all these antioxidase activities and antioxidant contents, and alleviated the membrane damage. CONCLUSIONS: ALA triggered GST activity encoded by GSTU43, and increased tomato tolerance to low temperature-induced oxidative stress, perhaps with the assistance of ascorbate- and/or a glutathione-regenerating cycles, and actively regulated the plant redox homeostasis. This latter effect reduced the degree of membrane lipid peroxidation, which was essential for the coordinated synthesis of chlorophyll.


Assuntos
Ácido Aminolevulínico/metabolismo , Clorofila/metabolismo , Genes de Plantas/fisiologia , Glutationa Transferase/metabolismo , Lycopersicon esculentum/genética , Proteínas de Plantas/metabolismo , Ácido Aminolevulínico/farmacologia , Resposta ao Choque Frio , Glutationa Transferase/genética , Homeostase/efeitos dos fármacos , Peroxidação de Lipídeos , Lycopersicon esculentum/efeitos dos fármacos , Lycopersicon esculentum/metabolismo , Lycopersicon esculentum/fisiologia , Oxirredução/efeitos dos fármacos , Proteínas de Plantas/genética
12.
J Agric Food Chem ; 67(31): 8668-8676, 2019 Aug 07.
Artigo em Inglês | MEDLINE | ID: mdl-31271028

RESUMO

This study investigated the effect of Chlorella vulgaris (C. vulgaris) on genotoxicity, cytotoxicity, and apoptosis in Caco-2 and HT-29 cells. C. vulgaris significantly induced DNA damage in both cell lines at a concentration of 200 µg dry matter/mL (comet tail intensity CTI: 24.6 ± 4.7% for Caco-2, 16.6 ± 0.9% for HT-29). The application of processing (sonication, ball-milling) did not affect the genotoxicity negatively and lowered the lipid peroxidation in C. vulgaris preparations. C. vulgaris-induced intracellular formation of reactive oxygen species in human cell lines and might be responsible for the genotoxic effect. A solid fraction mainly triggered the observed DNA damage (CTI: 41.5 ± 1.9%), whereas a hydrophilic (CTI: 7.9 ± 1.7%) and lipophilic (CTI: 10.2 ± 2.1%) fraction revealed a significantly lower tail intensity. C. vulgaris significantly induced DNA damage in both cell lines possibly through intracellular formation of reactive oxygen species; however, it was repaired after a 2 h recovery time or was even avoided at lower concentrations. In addition, none of the preparations indicated an adverse effect on cell proliferation or revealed apoptotic activity.


Assuntos
Chlorella vulgaris/química , Dano ao DNA/efeitos dos fármacos , Células Epiteliais/citologia , Mutagênicos/toxicidade , Extratos Vegetais/toxicidade , Apoptose/efeitos dos fármacos , Processos Autotróficos , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Chlorella vulgaris/crescimento & desenvolvimento , Chlorella vulgaris/efeitos da radiação , Ensaio Cometa , Células Epiteliais/efeitos dos fármacos , Células Epiteliais/metabolismo , Humanos , Luz , Peroxidação de Lipídeos/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismo
13.
Khirurgiia (Mosk) ; (6): 73-79, 2019.
Artigo em Russo | MEDLINE | ID: mdl-31317944

RESUMO

The purpose of the study is to establish the effectiveness of remaxol in the correction of endogenous intoxication in patients with acute peritonitis. MATERIAL AND METHODS: The work is based on the results of clinical and laboratory studies. The clinic examined 55 patients with acute moderate peritonitis as complication of various diseases (acute appendicitis, perforated gastric or duodenal ulcer, acute intestinal obstruction, acute destructive cholecystitis). Before surgical operation and in the early postoperative period we evaluated the severity of endogenous intoxication by the level of hydrophilic and hydrophobic toxic products. The content of molecular products of lipids peroxidation - oxidative stress, phospholipase activity were determined in the blood plasma. In the study group (n = 28) in the postoperative therapy additionally included remaxol (400 ml intravenous fluids). RESULTS: Research established that the occurrence of endogenous intoxication syndrome in patients with acute peritonitis associated with the activation of oxidative stress and phospholipases, high intensity of which is maintained even after elimination of the source of peritonitis with manifestation on the 1st day after surgery. Remaxol include leads to a significant reduction in the severity of intoxication syndrome in patients with acute peritonitis. Positive effect of the drug on the correction of endogenous intoxication is largely determined by its ability to significantly reduce oxidative stress and the activity of phospholipases, as the most important membrane destabilizing agents. The greatest detoxication effect of the drug is recorded when it is applied already at the preoperative stage of patients when its ability to reduce the activity of trigger agents of catabolic processes implemented to the greatest extent. CONCLUSION: In acute moderate peritonitis, remaxol use before surgery or in the early postoperative period in complex therapy leads to a significant correction of factors contributing to the development and preservation of the intensification of catabolic processes - one of the sources of endogenous intoxication.


Assuntos
Estresse Oxidativo/efeitos dos fármacos , Peritonite/tratamento farmacológico , Substâncias Protetoras/uso terapêutico , Succinatos/uso terapêutico , Doença Aguda , Humanos , Peroxidação de Lipídeos/efeitos dos fármacos , Peroxidação de Lipídeos/fisiologia , Metabolismo/efeitos dos fármacos , Metabolismo/fisiologia , Estresse Oxidativo/fisiologia , Peritonite/etiologia , Peritonite/metabolismo , Peritonite/cirurgia , Substâncias Protetoras/farmacologia , Succinatos/farmacologia
14.
Zhongguo Zhong Yao Za Zhi ; 44(9): 1862-1868, 2019 May.
Artigo em Chinês | MEDLINE | ID: mdl-31342714

RESUMO

Tanshinone Ⅱ_A( Tan Ⅱ_A),the liposoluble constituents of Salvia miltiorrhiza,can not only ameliorate the lipidic metabolism and decrease the concentration of lipid peroxidation,but also resist oxidation damage,scavenge free radicals and control inflammation,with a protective effect on prognosis after liver function impairment. Therefore,the studies on the exact mechanism of Tan Ⅱ_A in protecting the liver can provide important theoretical and experimental basis for the prevention and treatment effect of Tan Ⅱ_A for liver injury. In the present study,the protective effects and mechanism of Tan Ⅱ_A on 4-hydroxynonenal( 4-HNE)-induced liver injury were investigated in vitro. Normal liver tissues NCTC 1469 cells were used to induce hepatocytes oxidative damages by 4-HNE treatment. The protective effect of Tan Ⅱ_A on hepatocytes oxidative damages was detected by release amount of lactate dehydrogenase( LDH) analysis and hoechst staining. The protein expression changes of peroxisome proliferator-activated receptor α( PPARα) and peroxisome proliferator response element( PPRE) were analyzed by Western blot analysis in NCTC 1469 cells before and after Tan Ⅱ_A treatment. The gene expression changes of fatty aldehyde dehydrogenase( FALDH) were analyzed by Real-time polymerase chain reaction( PCR) analysis. The results showed that 4-HNE increased the release amount of LDH,lowered the cell viability of NCTC 1469 cells,and Tan Ⅱ_A reversed 4-HNE-induced hepatocyte damage. Western blot analysis and RT-PCR analysis results showed that 4-HNE decreased the expression of PPARα and FALDH and increased the expression of 4-HNE. However,the expression of PPARα and FALDH were increased significantly and the expression of 4-HNE was decreased obviously after Tan Ⅱ_A treatment. This study confirmed that the curative effect of Tan Ⅱ_A was obvious on hepatocytes damage,and the mechanism may be associated with activating PPARα and FALDH expression as well as scavenging 4-HNE.


Assuntos
Diterpenos de Abietano/farmacologia , Hepatócitos/efeitos dos fármacos , PPAR alfa/metabolismo , Aldeído Oxirredutases/metabolismo , Aldeídos , Animais , Linhagem Celular , Peroxidação de Lipídeos , Camundongos , Estresse Oxidativo
15.
Stomatologiia (Mosk) ; 98(3): 31-34, 2019.
Artigo em Russo | MEDLINE | ID: mdl-31322591

RESUMO

The aim of the study was to elucidate of changes in the level of lipid peroxidation products in saliva for the development of a method for the early diagnosis of complications in dental implantation. The study included 53 patients with complications of implant treatment, 31 patients with a safe outcome of dental implantation, and 13 clinically healthy individuals. In the saliva obtained at the stage of preparation for dental implantation, the content of products of lipid peroxidation was determined. Re-saliva was taken four months after dental implantation or in the case of peri-implantitis verification. It is established that the development of inflammatory complications of dental implantation is accompanied by the development of oxidative stress, which leads to local accumulation of lipoperoxidation products. An increase in the salivary level of products of lipid peroxidation during dental implantation is observed before the formation of clinically significant changes in the tissues of the implantation canal and is associated with a high risk of development of inflammatory complications of dental implantation. The most informative and prognostically unfavorable is the increase in the salivar level of the Schiff bases.


Assuntos
Implantes Dentários , Peroxidação de Lipídeos , Peri-Implantite , Saliva , Implantação Dentária , Implantes Dentários/efeitos adversos , Humanos , Estresse Oxidativo , Fatores de Risco , Saliva/química
16.
Chem Biol Interact ; 311: 108755, 2019 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-31319077

RESUMO

Effective control of white adipose tissue accumulation would provide a therapeutic strategy for obesity, which poses a growing global problem. The plant chemical mangiferin stimulates adenosine monophosphate-activated protein kinase (AMPK), which inhibits adipogenesis and has therefore been considered a therapeutic target for obesity and related diseases. We previously reported the anti-inflammatory properties of 6'-O-acetyl mangiferin (OAM). In this study, we evaluated the potential of OAM as an AMPK activator in vitro in 3T3-L1 preadipocytes. OAM inhibited adipogenesis as indicated by lower intracellular lipid and triglyceride accumulation as well as reduced adipogenic gene and protein expression upon treatment. OAM-treated 3T3-L1 cells excreted more glycerol, indicating increased lipolysis, which was supported by increased expression of lipolysis-related genes, including adipose triglyceride lipase and hormone-sensitive lipase. We determined that OAM upregulates lipolysis via phosphorylation-dependent activation of AMPK. Further, OAM upregulated the ß-oxidation pathway as indicated by enhanced expression of phosphorylated acetyl-CoA-carboxylase and long-chain acyl-CoA synthetase 1. In conclusion, OAM markedly decreased intracellular lipid accumulation by enhancing lipolysis via AMPK activation and by upregulating ß-oxidation. Thus, OAM has potential as a drug for the prevention and/or improvement of obesity and related diseases and deserves further study.


Assuntos
Proteínas Quinases Ativadas por AMP/metabolismo , Adipogenia/efeitos dos fármacos , Iris (Planta)/química , Lipólise/efeitos dos fármacos , Xantonas/farmacologia , Células 3T3-L1 , Proteínas Quinases Ativadas por AMP/genética , Acetil-CoA Carboxilase/metabolismo , Animais , Diferenciação Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Regulação da Expressão Gênica/efeitos dos fármacos , Iris (Planta)/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Camundongos , PPAR gama/genética , PPAR gama/metabolismo , Fosforilação/efeitos dos fármacos , Triglicerídeos/metabolismo
17.
Cancer Sci ; 110(9): 2856-2866, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31314163

RESUMO

4-Hydroxynonenal (HNE) is an important product of plasma membrane lipid peroxidation, which is a cause of cell and tissue injury. Mitochondrial DNA (mtDNA)-depleted ρ0 cells were established using human cervical cancer and oral squamous cell carcinoma cell lines. We investigated the effect of reactive oxygen species in ρ0 cells, especially the mechanism of hydrogen peroxide (H2 O2 )-mediated cell death. These cell were subjected to high oxidative stress and, compared with their parental cells, showed greater sensitivity to H2 O2 and high lipid peroxidation. Upregulation of HNE in the plasma membrane was observed prior to the increase in intracellular H2 O2 . The amount of oxidized lipid present changed H2 O2 permeability and administration of oxidized lipid led to further cell death after treatment with H2 O2 . Expression levels of lipoxygenase ALOX genes (ie ALOX5, ALOX12, and ALOX15) were upregulated in ρ0 cells, as were expression levels of ALOX12 and ALOX15 proteins. ALOX5 protein was mainly distributed in the nucleus, while ALOX12 and ALOX15 proteins were distributed in the nucleus and the cytoplasm. Although expression of COX2 gene was upregulated, its protein expression did not increase. ALOX (especially ALOX15) may be involved in the sensitivity of cancer cells to treatment. These data offer promise for the development of novel anticancer agents by altering the oxidation state of the plasma membrane. Our results showed that lipid peroxidation status is important for H2 O2 sensitivity and that ALOX15 is involved in lipid peroxidation status.


Assuntos
Apoptose/efeitos dos fármacos , Permeabilidade da Membrana Celular/genética , DNA Mitocondrial/genética , Peróxido de Hidrogênio/administração & dosagem , Peroxidação de Lipídeos/genética , Neoplasias/patologia , Aldeídos/metabolismo , Araquidonato 15-Lipoxigenase/metabolismo , Linhagem Celular Tumoral , Membrana Celular/metabolismo , Resistencia a Medicamentos Antineoplásicos , Complexo de Proteínas da Cadeia de Transporte de Elétrons/genética , Complexo de Proteínas da Cadeia de Transporte de Elétrons/metabolismo , Humanos , Peróxido de Hidrogênio/metabolismo , Peróxido de Hidrogênio/farmacocinética , Mitocôndrias/genética , Mitocôndrias/metabolismo , Neoplasias/tratamento farmacológico , Neoplasias/genética , Estresse Oxidativo/efeitos dos fármacos , Éteres Fosfolipídicos/administração & dosagem , Regulação para Cima
18.
Pestic Biochem Physiol ; 157: 138-142, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31153461

RESUMO

The evidence shows that organophosphate compounds (OPCs), as toxic agents that stimulate the cholinergic system, can increase the incidence of metabolic disorders such as dyslipidemia. In the present study, we focused on the role of tumor necrosis factor alpha (TNF-α) and serum leptin and ghrelin in Diazinon (DZN)-induced dyslipidemia. The rats were randomly divided into five groups comprising eight animals, and all were treated via oral gavage for 28 consecutive days as follows: group one received only corn oil daily, while groups two through five received different doses of DZN dissolved in corn oil equal to 1/40, 1/20, 1/10 and 1/5 of the LD50 daily, respectively. The alteration of the serum lipid profile, such as triglycerides, high-density lipoprotein (HDL) and very-low-density lipoprotein (VLDL), was confirmed the occurrence of dyslipidemia in the range of doses 1/20-1/5 LD50 of DZN. Although no changes were found in the serum leptin levels, a significant increase was observed in the size of adipocytes, as well as in the TNF-α and ghrelin serum levels, and in the accumulation of epididymal fat, especially at a dose of 1/5 LD50 of DZN. It seems that interactions among the inflammatory reaction, cholinergic pathways and ghrelin secretion may be effective causes of DZN-induced dyslipidemia.


Assuntos
Diazinon/farmacologia , Dislipidemias/sangue , Dislipidemias/induzido quimicamente , Grelina/sangue , Fator de Necrose Tumoral alfa/sangue , Animais , Antioxidantes , Butirilcolinesterase/sangue , Leptina/sangue , Peroxidação de Lipídeos/efeitos dos fármacos , Peroxidação de Lipídeos/fisiologia , Masculino , Compostos Organofosforados/farmacologia , Estresse Oxidativo/efeitos dos fármacos , Estresse Oxidativo/fisiologia , Ratos
19.
Pestic Biochem Physiol ; 157: 161-168, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31153464

RESUMO

Paraquat (PQ) is a widely used herbicide with no antidote which is implicated in the pathogenesis of the Parkinson's disease. The present study then investigated the potential of caffeic acid (CA), a known antioxidant, cardioprotective and neuroprotective molecule to counteract oxidative stress mediated by PQ. In addition, molecular docking was performed to understand the mechanism underlying the inhibitory effect of CA against PQ poisoning. The fruit fly, Drosophila melanogaster, was exposed to PQ (0.44 mg/g of diet) in the absence or presence of CA (0.25, 0.5, 1 and 2 mg/g of died) for 7 days. Data showed that PQ-fed flies had higher incidence of mortality which was associated with mitochondrial dysfunction, increased free Fe(II) content and lipid peroxidation when compared to the control. Co-exposure with CA reduced mortality and markedly attenuated biochemical changes induced by PQ. The mechanism investigated using molecular docking revealed a strong interaction (-6.2 Kcal/mol) of CA with D. melanogaster transcriptional activation of nuclear factor erythroid 2-related factor 2 (Nrf2). This was characterized by the binding of CA to keap-1 domain of Nrf2. Taking together these results indicate the protective effect of CA against PQ-induced oxidative damage in D. melanogaster was likely through its coordination which hinders Nrf2-keap-1 binding leading to an increase of the antioxidant defense system.


Assuntos
Ácidos Cafeicos/farmacologia , Fator 2 Relacionado a NF-E2/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Paraquat/farmacologia , Animais , Drosophila melanogaster , Ferro/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Fator 2 Relacionado a NF-E2/genética
20.
Phys Chem Chem Phys ; 21(25): 13526-13538, 2019 Jun 26.
Artigo em Inglês | MEDLINE | ID: mdl-31210238

RESUMO

We present a theoretical analysis of the putative magnetosensitivity of lipid peroxidation. We focus on the widely accepted radical pair mechanism (RPM) and a recently suggested idea based on spin dynamics induced in three-radical systems by the mutual electron-electron dipolar coupling (D3M). We show that, contrary to claims in the literature, lipid peroxides, the dominant chain carriers of the autoxidation process, have associated non-zero hyperfine coupling interactions. This suggests that their recombination could, in principle, be magnetosensitive due to the RPM. While the RPM indeed goes a long way to explaining magnetosensitivity in these systems, we show that the simultaneous interaction of three peroxyl radicals via the D3M can achieve larger magnetic field effects (MFE), even if the third radical is remote from the recombining radical pair. For randomly oriented three-radical systems, the D3M induces a low-field effect comparable to that of the RPM. The mechanism furthermore immunizes the spin dynamics to the presence of large exchange coupling interactions in the recombining radical pair, thereby permitting much larger MFE at magnetic field intensities comparable to the geomagnetic field than would be expected for the RPM. Based on these characteristics, we suggest that the D3M could be particularly relevant for MFE at low fields, provided that the local radical concentration is sufficient to allow for three-spin radical correlations. Eventually, our observations suggest that MFEs could intricately depend on radical concentration and larger effects could ensue under conditions of oxidative stress.


Assuntos
Peroxidação de Lipídeos , Peróxidos Lipídicos/química , Modelos Moleculares , Radicais Livres/química , Campos Magnéticos , Oxirredução , Estresse Oxidativo , Teoria Quântica
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