The Neuroprotective Role of TERT Influences the Expression of SOD1 in Motor Neurons and Mouse Brain: Implications for fALS
Published on: 14th October, 2023
Amyotrophic lateral sclerosis (ALS) disease is characterized by degeneration of motor neurons and elevation of brain oxidative stress. Previous studies demonstrated the neuroprotective effects of Telomerase reverse transcriptase (TERT) from oxidative stress. We showed that increasing TERT expression in the brain of the Tg hSOD1G93A mouse ALS model attenuated the disease pathology and increased the survival of motor neurons exposed to oxidative stress. How TERT increased the survival of motor neurons exposed to oxidative stress is not yet clear. Here we investigated the consequence of TERT depletion in motor neuron cells under normal and oxidative stress conditions and in mouse brains of TERT knockout mice, on the expression and activity of SOD1 and catalase enzymes. Depletion of mouse TERT caused mitochondrial dysfunction and impaired catalase and SOD1 activity. Compensation with hTERT restored the activity of SOD1. SOD1 expression increased in the brain of TERT KO and in ALS mice and decreased in the brain of WT mice treated with telomerase-increasing compounds. We suggest that the ability of TERT to protect neurons from oxidative stress affects the expression and activity of SOD1, in a TERT-dependent manner, and supports the notion of TERT as a therapeutic target for neurodegenerative diseases like ALS.
Effects of Zinc Supplementation on Oxidative Stress in Patients Undergoing Maintenance Hemodialysis
Published on: 20th October, 2023
Introduction: The aim of this study was to examine the effects of Zn supplementation on oxidative stress by evaluating changes in serum Copper (Cu) to Zinc (Zn) ratio, homocysteine (hCys), Glutathione (GSH), Total Bilirubin (TB) and Catalase (CAT) activity in hemodialysis patients.Methods: Seventy-seven HD patients were enrolled in a multicenter simple-blind randomized clinical trial. Only 37 HD patients completed the study. They were randomly divided into two groups and supplemented with zinc sulfate (n = 17) or placebo (n = 20) for two months. Serum Zn and Cu were measured by atomic absorption spectrophotometry. Serum hCys was measured by immunology method, serum GSH and CAT activity were assessed by spectrophotometry method and TB was measured by colorimetric method. Determinations were performed before and after supplementation.Findings: After zinc supplementation, serum Zn, serum GSH, and Serum Total Bilirubin (STB) significantly increased. Serum Cu to Zn ratio, serum hCys, and CAT activity significantly decreased in the Zn Zn-supplemented group.Conclusion: Zinc supplementation increased serum antioxidant factors such as Zn, GSH, and bilirubin and decreased serum oxidative factors such as copper to zinc ratio, hCys, and decreased CAT activity. The study results suggest that zinc supplementation may be a useful tool for the improvement of oxidative stress in HD patients.
Nitrogen supply effect on lettuce response to Botrytis cinerea and Sclerotinia minor
Published on: 6th November, 2023
Background information: Cultural practices play an important role on the development of pathogens (Datnoff, et al. 2007). In this context, several authors have been interested in studying the effects of mineral nutrition on the resistance of vegetables and fruits to fungi during storage, especially nitrogen.The purpose of the study: In this work we tested the effects of three contrasted regimes of nitrogen supply, with nitrate concentrations in the nutrient solutions of 2 mM (low), 10 mM (normal) and 20 mM (high) on the susceptibility of Lactuca sativa L towards Botrytis cinerea (BC87) and Sclerotinia minor (SM) during storage.Once harvested, the outerleaves of the plants derived from the three nitrogen regimes were inoculated with either Botrytis cinerea (BC87) or Sclerotinia minor (SM). Data showed that the resistance to this two pathogens increase when plants were developed under low nitrogen concentration. This resistance observed is correlated with low values in oxidative stress indicators (MDA and H2O2) and high values in total phenols.
Mechanism of Action and Validation of the Traditional Medicinal use of Grewia Tenax Fruits in Sudan to Encounter Iron Deficiency Anemia
Published on: 27th December, 2023
Introduction: In Sudan, Grewia tenax fruits, are known commonly as Goddaim. The fruit’s pericarp is used traditionally for a long time as a juice or a porridge to treat iron deficiency anemia (IDA). Traditional Goddaim users have a very strong belief in its effectiveness. However, the pattern of hemoglobin improvement follows an initial fast increase followed by a decline upon continuing its use. Some previous studies have attributed its effect to high iron content, while the iron quantity was too small. This work attempts to find an explanation for its mechanism of action by screening the fruit extract and its respective fractions for secondary metabolites, minerals, vitamins, and fibre. Methods: Entailed three methodologies: Chemical analysis to identify quantified minerals, ascorbic acid and non-digestible fibers, Phytochemical Analysis to separate and identify secondary metabolites using high-performance liquid chromatography coupled to tandem mass spectrometry (HPLC-MS-MS technique), and estimation of radical scavenging activities of crude fruit extract and its respective chloroform and ethyl acetate fractions by inhibition of the 2,2-diphenylpicrylhydrazyl (DPPH).Results: Ascorbic acid and indigestible fibres were revealed in the aqueous extract. Secondary metabolites were flavonoids (e.g., quercetin, kaempferol), organic acids (e.g., ferulic acid, chlorogenic acid), β-carboline alkaloids (e.g., 3-hydroxy-tetrahydroharman) identified in the chloroform, and ethyl acetate fractions. The in vitro antioxidant activity of G. tenax fruit extract was confirmed spectrophotometrically. Conclusion: It can be concluded that the initial enhancement of iron absorption through ascorbic acid and fibres, followed by iron uptake inhibition, could be explained by iron chelation by the chelators in the fruits. This paradoxical effect may qualify G. tenax fruits as a safety gauge for improving haemoglobin levels without compromising iron excess once iron stores are filled by keeping the oxidative stress in check. This may present G. tenax fruits as a good and safe remedy that optimizes the treatment of IDA.
Antioxidants and Pregnancy Complications: Exploring Therapeutic Strategies for Better Outcomes
Published on: 25th January, 2024
Pregnancy complications present significant challenges, impacting maternal health and fetal development. Oxidative stress, a key contributor to various pregnancy-related disorders such as preeclampsia, gestational diabetes mellitus (GDM), and preterm birth, has spurred interest in exploring antioxidant interventions. Antioxidants, known for their ability to counteract oxidative damage, have emerged as potential therapeutic agents to mitigate these complications. This paper synthesizes current knowledge on the role of antioxidants in pregnancy, elucidating their mechanisms of action, sources, and impact on oxidative stress-related complications. It examines diverse antioxidant compounds, including vitamins C and E, selenium, and natural phytochemicals, highlighting their potential to modulate oxidative stress pathways and promote maternal-fetal well-being. Furthermore, this paper critically analyzes clinical studies, meta-analyses, and preclinical research exploring the efficacy and safety of antioxidant supplementation during pregnancy. It discusses the complexities surrounding optimal dosages, timing, and formulations of antioxidants, aiming to delineate strategies for their integration into prenatal care. In conclusion, this review provides insights into the promising role of antioxidants as therapeutic strategies to alleviate pregnancy complications associated with oxidative stress. It highlights avenues for future research, advocating for a deeper understanding of antioxidant mechanisms and their optimal utilization in prenatal care to enhance maternal and fetal health outcomes.
Rida Herbal Bitters Improve Cardiovascular Function in High-fat Diet/Streptozotocin-induced Diabetic Rats
Published on: 28th February, 2024
Background: Effective medication to manage diabetes mellitus-related organ complications with minimal adverse drug toxicity is still in pursuit by scientists worldwide. This study investigated the cardio-protective of Rida herbal bitter (RHB) in a high-fat diet/streptozotocin (STZ)-induced diabetic rats.Methods: Thirty-two matured male Wistar rats (250 ± 20g) were used. The animals were fed with high-fat diet (HFD) for 6 weeks before diabetes induction. A single dose of (35 mg/kgb.wt) freshly prepared STZ was injected intraperitoneally to induce diabetes. The animals were allocated into four groups, 8rats/group. Group I: control; Group II: HFD/STZ-induced diabetic rats; Groups III & IV: HFD/STZ-induced diabetic rats treated with 0.3 ml RHB & 200 mg/kgb.wt metformin respectively. At the end of the experiment, the animals were sacrificed, blood was sample collected via cardiac puncture and the heart was excised and homogenized. The blood samples and cardiac homogenates tissue were centrifuged to retrieve clear supernatant plasma for biochemical assay.Results: Diabetic rats exhibited significant (p < 0.05) elevated blood glucose, insulin, glycated hemoglobin (HbA1c), cardiac biomarkers, lipid profile, malondialdehyde (MDA), pro-inflammatory cytokines, food, and water intake levels with a reduction in body weight, cardiac antioxidant activity, and total protein. RHB administration significantly (p < 0.05) diminished the blood glucose, insulin, HbA1c, cardiac biomarkers, MDA, pro-inflammatory cytokines, lipid profile, food, and water intake, and improved the body weight cardiac antioxidant activity, and total protein.Conclusion: Rida herbal bitter possesses a cardio-protective effect from this study and could be a better alternative medication for managing diabetes and its related cardiovascular complications.
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