scholarly journals Trehalose for Ocular Surface Health

Biomolecules ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 809
Author(s):  
Jarmo Laihia ◽  
Kai Kaarniranta
Keyword(s):  
Oxidative Stress ◽  
Clinical Trials ◽  
Animal Models ◽  
Dry Eye ◽  
Ocular Surface ◽  
Stress Protein ◽  
Life Forms ◽  
Beneficial Effects ◽  
Protein Clearance ◽  
Ocular Surface Health

Trehalose is a natural disaccharide synthesized in various life forms, but not found in vertebrates. An increasing body of evidence demonstrates exceptional bioprotective characteristics of trehalose. This review discusses the scientific findings on potential functions of trehalose in oxidative stress, protein clearance, and inflammation, with an emphasis on animal models and clinical trials in ophthalmology. The main objective is to help understand the beneficial effects of trehalose in clinical trials and practice, especially in patients suffering from ocular surface disease. The discussion is supplemented with an overview of patents for the use of trehalose in dry eye and with prospects for the 2020s.

scholarly journals Successfully Improving Ocular Drug Delivery Using the Cationic Nanoemulsion, Novasorb

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Frederic Lallemand ◽  
Philippe Daull ◽  
Simon Benita ◽  
Ronald Buggage ◽  
Jean-Sebastien Garrigue
Keyword(s):  
Clinical Trials ◽  
Dry Eye ◽  
Ocular Surface ◽  
Surface Damage ◽  
Symptomatic Treatment ◽  
Pharmacokinetic Studies ◽  
Beneficial Effects ◽  
Ophthalmic Delivery ◽  
Preservative Free ◽  
Selection Of

Topical ophthalmic delivery of active ingredients can be achieved using cationic nanoemulsions. In the last decade, Novagali Pharma has successfully developed and marketed Novasorb, an advanced pharmaceutical technology for the treatment of ophthalmic diseases. This paper describes the main steps in the development of cationic nanoemulsions from formulation to evaluation in clinical trials. A major challenge of the formulation work was the selection of a cationic agent with an acceptable safety profile that would ensure a sufficient ocular surface retention time. Then, toxicity and pharmacokinetic studies were performed showing that the cationic emulsions were safe and well tolerated. Even in the absence of an active ingredient, cationic emulsions were observed in preclinical studies to have an inherent benefit on the ocular surface. Moreover, clinical trials demonstrated the efficacy and safety of cationic emulsions loaded with cyclosporine A in patients with dry eye disease. Ongoing studies evaluating latanoprost emulsion in patients with ocular surface disease and glaucoma suggest that the beneficial effects on reducing ocular surface damage may also extend to this patient population. The culmination of these efforts has been the marketing of Cationorm, a preservative-free cationic emulsion indicated for the symptomatic treatment of dry eye.

scholarly journals Rapamycin and Alzheimer’s disease: Time for a clinical trial?

2019 ◽  
Vol 11 (476) ◽  
pp. eaar4289 ◽  
Author(s):  
Matt Kaeberlein ◽  
Veronica Galvan
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Clinical Trial ◽  
Clinical Trials ◽  
Animal Models ◽  
Mouse Models ◽  
Mtor Inhibitors ◽  
Beneficial Effects

The drug rapamycin has beneficial effects in a number of animal models of neurodegeneration and aging including mouse models of Alzheimer’s disease. Despite its compelling preclinical record, no clinical trials have tested rapamycin or other mTOR inhibitors in patients with Alzheimer’s disease. We argue that such clinical trials should be undertaken.

scholarly journals Coenzyme Q10 Supplementation for the Reduction of Oxidative Stress: Clinical Implications in the Treatment of Chronic Diseases

2020 ◽  
Vol 21 (21) ◽  
pp. 7870 ◽  
Author(s):  
Francisco Miguel Gutierrez-Mariscal ◽  
Antonio Pablo Arenas-de Larriva ◽  
Laura Limia-Perez ◽  
Juan Luis Romero-Cabrera ◽  
Elena Maria Yubero-Serrano ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Clinical Trials ◽  
Chronic Diseases ◽  
Coenzyme Q10 ◽  
Chronic Obstructive ◽  
Clinical Implications ◽  
Main Function ◽  
Alcoholic Fatty Liver ◽  
Beneficial Effects ◽  
Coq10 Supplementation

Apart from its main function in the mitochondria as a key element in electron transport, Coenzyme Q10 (CoQ10) has been described as having multiple functions, such as oxidant action in the generation of signals and the control of membrane structure and phospholipid and cellular redox status. Among these, the most relevant and most frequently studied function is the potent antioxidant capability of its coexistent redox forms. Different clinical trials have investigated the effect of CoQ10 supplementation and its ability to reduce oxidative stress. In this review, we focused on recent advances in CoQ10 supplementation, its role as an antioxidant, and the clinical implications that this entails in the treatment of chronic diseases, in particular cardiovascular diseases, kidney disease, chronic obstructive pulmonary disease, non-alcoholic fatty liver disease, and neurodegenerative diseases. As an antioxidant, CoQ10 has proved to be of potential use as a treatment in diseases in which oxidative stress is a hallmark, and beneficial effects of CoQ10 have been reported in the treatment of chronic diseases. However, it is crucial to reach a consensus on the optimal dose and the use of different formulations, which vary from ubiquinol or ubiquinone Ubisol-Q10 or Qter®, to new analogues such as MitoQ, before we can draw a clear conclusion about its clinical use. In addition, a major effort must be made to demonstrate its beneficial effects in clinical trials, with a view to making the implementation of CoQ10 possible in clinical practice.

scholarly journals Oxidative Stress and Diabetic Retinopathy

2007 ◽  
Vol 2007 ◽  
pp. 1-12 ◽  
Author(s):  
Renu A. Kowluru ◽  
Pooi-See Chan
Keyword(s):  
Oxidative Stress ◽  
Clinical Trials ◽  
Animal Studies ◽  
Antioxidant Defense System ◽  
Oxygen Metabolism ◽  
Developed Countries ◽  
Causal Link ◽  
Diabetic Patients ◽  
Metabolic Abnormalities ◽  
Beneficial Effects

Oxygen metabolism is essential for sustaining aerobic life, and normal cellular homeostasis works on a fine balance between the formation and elimination of reactive oxygen species (ROS). Oxidative stress, a cytopathic consequence of excessive production of ROS and the suppression of ROS removal by antioxidant defense system, is implicated in the development of many diseases, including Alzheimer's disease, and diabetes and its complications. Retinopathy, a debilitating microvascular complication of diabetes, is the leading cause of acquired blindness in developed countries. Many diabetes-induced metabolic abnormalities are implicated in its development, and appear to be influenced by elevated oxidative stress; however the exact mechanism of its development remains elusive. Increased superoxide concentration is considered as a causal link between elevated glucose and the other metabolic abnormalities important in the pathogenesis of diabetic complications. Animal studies have shown that antioxidants have beneficial effects on the development of retinopathy, but the results from very limited clinical trials are somewhat ambiguous. Although antioxidants are being used for other chronic diseases, controlled clinical trials are warranted to investigate potential beneficial effects of antioxidants in the development of retinopathy in diabetic patients.

scholarly journals Mitochondria-Targeted Antioxidant SkQ1 Prevents Anesthesia-Induced Dry Eye Syndrome

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Evgeni Yu. Zernii ◽  
Olga S. Gancharova ◽  
Viktoriia E. Baksheeva ◽  
Marina O. Golovastova ◽  
Ekaterina I. Kabanova ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
General Anesthesia ◽  
Dry Eye ◽  
Ocular Surface ◽  
Protective Action ◽  
Dry Eye Syndrome ◽  
Clinical State ◽  
Ocular Surgery ◽  
Age Related

Dry eye syndrome (DES) is an age-related condition increasingly detected in younger people of risk groups, including patients who underwent ocular surgery or long-term general anesthesia. Being a multifactorial disease, it is characterized by oxidative stress in the cornea and commonly complicated by ocular surface inflammation. Polyetiologic DES is responsive to SkQ1, a mitochondria-targeted antioxidant suppressing age-related changes in the ocular tissues. Here, we demonstrate safety and efficacy of topical administration of SkQ1 at a dosage of 7.5 μM for the prevention of general anesthesia-induced DES in rabbits. The protective action of SkQ1 improves clinical state of the ocular surface by inhibiting apoptotic and prenecrotic changes in the corneal epithelium. The underlying mechanism involves the suppression of the oxidative stress supported by the stimulation of intrinsic antioxidant activity and the activity of antioxidant enzymes, foremost glutathione peroxidase and glutathione reductase, in the cornea. Furthermore, SkQ1 increases antioxidant activity and stability of the tear film and produces anti-inflammatory effect exhibited as downregulation of TNF-α and IL-6 and pronounced upregulation of IL-10 in tears. Our data suggest novel features of SkQ1 and point to its feasibility in patients with DES and individuals at risk for the disease including those subjected to general anesthesia.

scholarly journals Serum levels of antioxidants and its supplementation in people living with HIV: integrative review

2021 ◽  
Vol 11 (2) ◽  
pp. 43-50
Author(s):  
Aline Roberta Rodrigues da Silva ◽  
Patricia Dias de Brito
Keyword(s):  
Oxidative Stress ◽  
Clinical Trials ◽  
Antiretroviral Therapy ◽  
Serum Levels ◽  
Integrative Review ◽  
Food Sources ◽  
People Living With Hiv ◽  
Beneficial Effects ◽  
Significant Damage ◽  
Living With Hiv

Objective: To conduct an integrative review of serum levels of antioxidants and the effects of their supplementation on people living with HIV (PLHIV). Methods: A research was performed in the electronic databases LILACS and MEDLINE, using the descriptors "HIV" AND "antioxidants"; 110 publications were identified, 92 of which were available in the MEDLINE database and 3 in the LILACS database. After applying the exclusion criteria, 8 articles were selected for final evaluation.Results: The studies selected for the review were divided into 4 prospective observational studies and 4 clinical trials with supplementation of antioxidants or food sources of antioxidants. We observed that the initiation of antiretroviral therapy and its prolonged use negatively influenced the parameters of oxidative stress, and that deficiency of antioxidants was associated with more significant damage to mitochondrial DNA. Supplementation of foods that are sources of antioxidants, such as dark chocolate and spirulina, has had beneficial effects on serum lipids and antioxidant capacity. Conclusion: Clinical trials with a more robust methodology, supplementation of isolated nutrients, for more extended periods of intervention, and with the assessment of food consumption are necessary to elucidate their effects on oxidative stress in PLHIV faced with factors such as the use of antiretroviral therapy and changes in metabolic rates of this population.

scholarly journals Antioxidant Effects of the Prenylated Flavonoid, Xanthohumol, on Corneal Epithelial Cells in Experimental Dry Eye Disease

2021 ◽  
Author(s):  
Anita Kirti Ghosh ◽  
Rubina Thapa ◽  
Harsh Nilesh Hariani ◽  
Michael Volyanyuk ◽  
Karoline Anne Orloff ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Epithelial Cells ◽  
Dry Eye ◽  
Ocular Surface ◽  
Dry Eye Disease ◽  
Eye Disease ◽  
Related Factor ◽  
Corneal Epithelial Cells ◽  
Corneal Epithelial

Elevated levels of oxidative stress in the corneal epithelium contribute to the progression of dry eye disease pathology. Previous studies have shown that antioxidant therapeutic intervention is a promising avenue to reduce disease burden and slow disease progression. In this study, we evaluated the pharmacological efficacy of Xanthohumol in preclinical models for dry eye disease. Xanthohumol is a naturally occurring prenylated chalconoid that promotes the transcription of phase II antioxidant enzymes. Xanthohumol exerted a dose-response in preventing tert-butylhydroxide-induced loss of cell viability in human corneal epithelial (HCE-T) cells and resulted in a significant increase in expression of nuclear factor erythroid 2-related factor 2 (Nrf2), the master regulator of the endogenous antioxidant system. Xanthohumol-encapsulating poly(lactic-co-glycolic acid) nanoparticles (PLGA NP) were cytoprotective against oxidative stress in vitro, and significantly reduced corneal fluorescein staining in the mouse desiccating stress/ scopolamine model for dry eye disease in vivo by reducing oxidative stress-associated DNA damage in corneal epithelial cells. PLGA NP represent a safe and efficacious drug delivery vehicle for hydrophobic small molecules to the ocular surface. Optimization of NP-based antioxidant formulations with the goal to minimize instillation frequency may represent future therapeutic options for dry eye disease and related ocular surface disease.

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