scholarly journals Anticataractogenesis and Antiretinopathy Effects of the Novel Protective Agent Containing the Combined Extract of Mango and Vietnamese Coriander in STZ-Diabetic Rats

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Jintanaporn Wattanathorn ◽  
Paphaphat Thiraphatthanavong ◽  
Wipawee Thukham-mee ◽  
Supaporn Muchimapura ◽  
Panakaporn Wannanond ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Diabetic Retinopathy ◽  
Aldose Reductase ◽  
Diabetic Rats ◽  
Potential Candidate ◽  
Protective Agent ◽  
The Novel ◽  
Diabetic Cataract ◽  
Oxidative Stress Status ◽  
Mango Seed

The novel protectant against diabetic cataract and diabetic retinopathy is currently required due to the increased prevalence and therapeutic limitation. Based on the advantage of polyphenol on diabetic eye complications, we hypothesized that the combined extract of mango seed Vietnamese coriander (MPO), a polyphenol-rich substance, should possess anticataractogenesis and antiretinopathy in streptozotocin- (STZ-) diabetic rats. MPO at doses of 2, 10, and 50 mg/kg·BW were orally given to STZ-diabetic rats for 10 weeks. Lens opacity was evaluated every week throughout a study period whereas the evaluation of cataract severity and histological changes of both rat lens epithelium and retina together with the biochemical assays of oxidative stress status, aldose reductase, p38MAPK, ERK1/2, and VEGF were performed at the end of experiment. Our data showed that MPO improved cataract and retinopathy in STZ-diabetic rats. The improved oxidative stress status and the decreased p38MAPK, ERK1/2, and VEGF were also observed. Therefore, anticataractogenesis and antiretinopathy of MPO might occur partly via the decreased oxidative stress status and the suppression of aldose reductase, p38MAPK, ERK1/2, and VEGF. This study points out that MPO is the potential candidate protectant against diabetic cataract and diabetic retinopathy. However, the exploration for possible active ingredient (S) still requires further researches.

Taxifolin Shows Anticataractogenesis and Attenuates Diabetic Retinopathy in STZ-Diabetic Rats via Suppression of Aldose Reductase, Oxidative Stress, and MAPK Signaling Pathway

2020 ◽  
Vol 20 (4) ◽  
pp. 599-608
Author(s):  
Fei Liu ◽  
Ying Ma ◽  
Yanli Xu
Keyword(s):  
Oxidative Stress ◽  
Diabetic Retinopathy ◽  
Protective Effect ◽  
Aldose Reductase ◽  
Mapk Signaling ◽  
Oral Route ◽  
Diabetic Rats ◽  
Potential Candidate ◽  
Oxidative Potential ◽  
The Status

Background: Due to the increased prevalence of diabetes-associated complications of the eye like diabetic retinopathy and cataract, the need for a novel therapeutic agent is urgent. Due to the advantages that the polyphenolic compounds enjoy in diabetes and associated complications, we postulated that Taxifolin (TXF), a poly-phenolic flavanol, could show anti-retinopathic and anti-cataract effect in diabetes-induced rats. Methods: TXF at a dose of 10, 25, and 50 mg/kg was given by oral route to STZ mediated diabetic rats for a time period of 10 weeks. The opacity of lens was studied after every 7 days of treatment till 10 weeks; evaluation of the severity of cataract and changes in the histology of lens as well as retina was done. Tissue homogenates of lens isolated after the end of the study were evaluated for markers of oxidative stress, levels of aldose reductase, p38MAPK, VEGF, and ERK1/2. Results: Outcomes suggested that TXF improved retinopathy and cataract in diabetes-induced rats. The treatment of TXF also improved the status of oxidative stress and inhibited the levels of p38MAPK, VEGF, and ERK1/2. The treatment also improved the lens opacity in diabetic rats. The results suggest that the protective effect of TXF against cataract and retinopathy may be due to the anti-oxidative potential of TXF and its inhibiting effect on VEGF, ERK1/2, p38MAPK, and aldose reductase. Conclusion: The study confirms that TXF is a potential candidate showing a protective effect against diabetic induced retinopathy and cataract..

scholarly journals Beneficial Effect of Aqueous Garlic Extract on Inflammation and Oxidative Stress Status in the Kidneys of Type 1 Diabetic Rats

2016 ◽  
Vol 32 (3) ◽  
pp. 329-336 ◽  
Author(s):  
Abolfazl Nasiri ◽  
Nasrin Ziamajidi ◽  
Roghayeh Abbasalipourkabir ◽  
Mohammad Taghi Goodarzi ◽  
Massoud Saidijam ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Beneficial Effect ◽  
Diabetic Rats ◽  
Garlic Extract ◽  
Oxidative Stress Status ◽  
And Oxidative Stress

scholarly journals Electrospun Nanofibers Loaded with Quercetin Promote the Recovery of Focal Entrapment Neuropathy in a Rat Model of Streptozotocin-Induced Diabetes

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Chonlathip Thipkaew ◽  
Jintanaporn Wattanathorn ◽  
Supaporn Muchimapura
Keyword(s):  
Oxidative Stress ◽  
Functional Recovery ◽  
Electrospun Nanofibers ◽  
Diabetic Rats ◽  
Nerve Lesion ◽  
Electrospinning Technique ◽  
Oxidative Stress Status ◽  
Male Wistar Rats ◽  
Streptozotocin Induced Diabetes ◽  
The Right

In this study, quercetin-loaded zein-based nanofibers were developed using electrospinning technique. The therapeutic effect of these quercetin-loaded nanofibers on neuropathy in streptozotocin- (STZ-) induced diabetes in rats was assessed. Diabetic condition was induced in male Wistar rats by STZ, after which a crush injury of the right sciatic nerve was performed to induce mononeuropathy. Functional recovery was assessed using walking track analysis, measurements of foot withdrawal reflex, nerve conduction velocity, and morphological analysis. The oxidative stress status and the ratio of phosphorylated extracellular recognition kinase (pERK)/extracellular recognition kinase (ERK) expression in the nerve lesion were also assessed in order to elucidate the potential mechanisms involved. Results showed that quercetin-loaded zein-based nanofibers slightly enhanced functional recovery from neuropathy in STZ-diabetic rats. The potential mechanism might partially involve improvements in oxidative stress status and the ratio of pERK/ERK expression in the nerve lesion.

scholarly journals Fortified Extract of Red Berry,Ginkgo biloba, and White Willow Bark in Experimental Early Diabetic Retinopathy

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Claudio Bucolo ◽  
Giuseppina Marrazzo ◽  
Chiara Bianca Maria Platania ◽  
Filippo Drago ◽  
Gian Marco Leggio ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Diabetic Retinopathy ◽  
Ginkgo Biloba ◽  
Plasma Lipid ◽  
Thiobarbituric Acid ◽  
Diabetic Rats ◽  
Sprague Dawley ◽  
White Willow ◽  
Willow Bark

Diabetic retinopathy is a complex condition where inflammation and oxidative stress represent crucial pathways in the pathogenesis of the disease. Aim of the study was to investigate the effects of a fortified extract of red berries,Ginkgo bilobaand white willow bark containing carnosine andα-lipoic acid in early retinal and plasma changes of streptozotocin-induced diabetic rats. Diabetes was induced by a single streptozotocin injection in Sprague Dawley rats. Diabetics and nondiabetic (control) rats were treated daily with the fortified extract for the ten days. Retina samples were collected and analyzed for their TNF-αand VEGF content. Moreover, plasma oxidative stress was evaluated by thiobarbituric acid reacting substances (TBARS). Increased TNF-αand VEGF levels were observed in the retina of diabetic rats. Treatment with the fortified extract significantly lowered retinal cytokine levels and suppressed diabetes-related lipid peroxidation. These data demonstrate that the fortified extract attenuates the degree of retinal inflammation and plasma lipid peroxidation preserving the retina in early diabetic rats.

scholarly journals Gentiopicroside attenuates diabetic retinopathy by inhibiting inflammation, oxidative stress, and NF-κB activation in rat model

2019 ◽  
Vol 17 ◽  
pp. 205873921984783 ◽  
Author(s):  
Xian Zhang ◽  
En Shi ◽  
Lan Yang ◽  
Weina Fu ◽  
Feng Hu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Diabetic Retinopathy ◽  
Mtt Assay ◽  
Interleukin 1 ◽  
Phosphate Buffer Solution ◽  
Diabetic Rats ◽  
Angiogenic Factors ◽  
Male Rats ◽  
Buffer Solution ◽  
Defensive Role

Diabetic retinopathy, an inflammatory condition, is one of the devastating complication associated with diabetes that can lead to irreversible blindness. Gentiopicroside (GP), a secoiridoid glycoside, exhibits anti-inflammatory and antioxidant activity. The investigation was carried out to explore whether GP could attenuate diabetic retinopathy in diabetic rats. Diabetes was induced by injecting streptozotocin (STZ) (65 mg/kg) intraperitoneally in 8-weeks-old male rats (200–240 g). The treatment group received GP (20, 40, 80 mg/kg) orally for a duration of 10 weeks in diabetic rats (n = 10), and the diabetic group animals received phosphate buffer solution (n = 20). Effect of GP on cell viability study was performed by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay. Oxidative stress markers, inflammatory mediators, and angiogenic factors were quantified in the retinal tissues of diabetic animals. All data were analyzed by one-way analysis of variance (ANOVA) at P < 0.05. Cytoprotective effect of GP was observed in MTT assay. GP effectively downregulated inflammatory cytokine, nuclear factor κB (NF-κB), tumor necrosis factor-α (TNF-α), interleukin 1 beta (IL-1β), and intercellular adhesion molecules-1 (ICAM-1), and upregulated antioxidant markers glutathione (GSH), superoxide dismutase (SOD), and catalase (CAT) in the retina of diabetic rats. GP equilibrated the disturbed angiogenic factors in the diabetic retinal tissues. Results clearly indicated defensive role of GP in the treatment of diabetic retinopathy by inhibition of NF-κB and oxidative stress.

scholarly journals Oat Attenuation of Hyperglycemia-Induced Retinal Oxidative Stress and NF-B Activation in Streptozotocin-Induced Diabetic Rats

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Abdulrahman L. Al-Malki
Keyword(s):  
Oxidative Stress ◽  
Diabetic Retinopathy ◽  
Protective Role ◽  
Endothelial Damage ◽  
Diabetic Rats ◽  
Albino Rats ◽  
Mobility Shift ◽  
Microvascular Damage ◽  
Necrosis Factor Alpha ◽  
Diabetic Retina

The overproduction of reactive oxygen species (ROS) plays a central role in the pathogenesis of endothelial damage in diabetes. To assess the effect of oat on experimental diabetic retinopathy, five groups of Albino rats were studied: nondiabetic control, untreated diabetic, and diabetic rats treated with 5%, 10%, and 20% (W/W) oat of the diet for 12 weeks. Novel data were obtained in this study indicating a protective role of oat against oxidative stress and diabetic retinopathy. The effects of oat on parameters of oxidative stress, AGE, and nuclear factor kappa B (NF-B) were assessed by ELISA and NF-B activation by electrophoretic mobility shift assay. Tumor necrosis factor alpha (TNF) and vascular endothelial growth factor (VEGF) were also determined. After 12 weeks of diabetes, oat treatment reduced blood glucose levels, HbA1c, all oxidative stress markers, CML, normalized NF-B activation and TNF expression. Furthermore it reduced VEGF in the diabetic retina by 43% (). In conclusion, oat modulates microvascular damage through normalized pathways downstream of ROS overproduction and reduction of NF-B and its controlled genes activation, which may provide additional endothelial protection.

scholarly journals Reduction of Glut1 in retinal neurons but not the RPE alleviates polyol accumulation and normalizes early characteristics of diabetic retinopathy

2020 ◽  
Author(s):  
Nicholas C. Holoman ◽  
Jacob J. Aiello ◽  
Timothy D. Trobenter ◽  
Matthew J. Tarchick ◽  
Michael R. Kozlowski ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Diabetic Retinopathy ◽  
Aldose Reductase ◽  
Glucose Transporter ◽  
Vision Loss ◽  
Significant Proportion ◽  
Diabetic Patients ◽  
Retinal Neurons ◽  
Anti Vegf ◽  
Facilitative Glucose Transporter

AbstractHyperglycemia is a key determinant for development of diabetic retinopathy (DR). Inadequate glycemic control exacerbates retinopathy, while normalization of glucose levels delays its progression. In hyperglycemia, hexokinase is saturated and excess glucose is metabolized to sorbitol by aldose reductase via the polyol pathway. Therapies to reduce retinal polyol accumulation for the prevention of DR have been elusive due to low sorbitol dehydrogenase levels in the retina and inadequate inhibition of aldose reductase. Using systemic and conditional genetic inactivation, we targeted the primary facilitative glucose transporter in the retina, Glut1, as a preventative therapeutic in diabetic male and female mice. Unlike wildtype diabetics, diabetic Glut1+/− mice did not display elevated Glut1 levels in the retina. Furthermore, diabetic Glut1+/− mice exhibited ameliorated ERG defects, inflammation and oxidative stress, which was correlated with a significant reduction in retinal sorbitol accumulation. RPE-specific reduction of Glut1 did not prevent an increase in retinal sorbitol content or early hallmarks of DR. However, like diabetic Glut1+/− mice, reduction of Glut1 specifically in retinal neurons mitigated polyol accumulation and completely prevented retinal dysfunction and the elevation of markers for oxidative stress and inflammation associated with diabetes. These results suggest that modulation of retinal polyol accumulation via Glut1 in photoreceptors can circumvent the difficulties in regulating systemic glucose metabolism and be exploited to prevent DR.SignificanceDiabetic retinopathy (DR) affects one third of diabetic patients and is the primary cause of vision loss in adults aged 20-74. While anti-VEGF and photocoagulation treatments for the late-stage vision threatening complications can prevent vision loss, a significant proportion of patients do not respond to anti-VEGF therapies and mechanisms to stop progression of early-stage symptoms remain elusive. Glut1 is the primary facilitative glucose transporter for the retina. We determined that a moderate reduction in Glut1 levels, specifically in retinal neurons, but not the RPE, was sufficient to prevent retinal polyol accumulation and the earliest functional defects to be identified in the diabetic retina. Our study defines modulation of Glut1 in retinal neurons as a targetable molecule for prevention of DR.

scholarly journals Berberine ameliorates renal injury in streptozotocin-induced diabetic rats by suppression of both oxidative stress and aldose reductase

2008 ◽  
Vol 121 (8) ◽  
pp. 706-712 ◽  
Author(s):  
Wei-hua LIU ◽  
Zi-qing HEI ◽  
Hong NIE ◽  
Fu-tian TANG ◽  
He-qing HUANG ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Aldose Reductase ◽  
Renal Injury ◽  
Diabetic Rats

Design and development of novel thiazole-sulfonamide derivatives as a protective agent against diabetic cataract in Wistar rats via inhibition of aldose reductase

2021 ◽  
Vol 27 (1) ◽  
pp. 63-70
Author(s):  
Liang Yin ◽  
Mingxue Zhang ◽  
Tiangeng He
Keyword(s):  
Body Weight ◽  
Western Blot ◽  
Aldose Reductase ◽  
Wistar Rats ◽  
Potent Inhibitor ◽  
Insulin Level ◽  
Protective Agent ◽  
Diabetic Cataract ◽  
Reductase Inhibitors ◽  
Glucose Output

Abstract In recent years, ALR2 (aldose reductase) inhibitors have attracted attention for their effective ability to reduce the progression of diabetes-associated cataracts. Therefore, in the present article, we intended to develop novel thiazole-sulfonamide hybrids as a potent inhibitor of ALR2. These molecules significantly inhibited the ALR2 level in the rat lenses homogenate, where the most potent compound 7b showed activity comparable to sorbinil as standard. In Wistar rats, compound 7b improved the insulin level and body weight of the experimental animal together with a reduction in the glucose output. Compound 7b showed a significant reduction in the expression of ALR2 in rat lenses in western blot analysis.

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