scholarly journals Adenosine A3 receptor activated in H2O2 oxidative stress of primary open-angle glaucoma

2021 ◽  
Vol 9 (7) ◽  
pp. 526-526
Author(s):  
Ziyu Zhou ◽  
Zhaolin Gao ◽  
Weitao Yan ◽  
Yun Zhang ◽  
Jufang Huang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Open Angle ◽  
Adenosine A3 Receptor

scholarly journals Crosstalk between MicroRNA and Oxidative Stress in Primary Open-Angle Glaucoma

2021 ◽  
Vol 22 (5) ◽  
pp. 2421
Author(s):  
Saray Tabak ◽  
Sofia Schreiber-Avissar ◽  
Elie Beit-Yannai
Keyword(s):  
Oxidative Stress ◽  
Transforming Growth Factor Beta ◽  
Transforming Growth Factor ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Additional Treatment ◽  
Type I ◽  
Open Angle ◽  
Outflow Resistance ◽  
Stress Injury

Reactive oxygen species (ROS) plays a key role in the pathogenesis of primary open-angle glaucoma (POAG), a chronic neurodegenerative disease that damages the trabecular meshwork (TM) cells, inducing apoptosis of the retinal ganglion cells (RGC), deteriorating the optic nerve head, and leading to blindness. Aqueous humor (AH) outflow resistance and intraocular pressure (IOP) elevation contribute to disease progression. Nevertheless, despite the existence of pharmacological and surgical treatments, there is room for the development of additional treatment approaches. The following review is aimed at investigating the role of different microRNAs (miRNAs) in the expression of genes and proteins involved in the regulation of inflammatory and degenerative processes, focusing on the delicate balance of synthesis and deposition of extracellular matrix (ECM) regulated by chronic oxidative stress in POAG related tissues. The neutralizing activity of a couple of miRNAs was described, suggesting effective downregulation of pro-inflammatory and pro-fibrotic signaling pathways, including nuclear factor kappa-light-chain-enhancer of activated B cells (NF-kB), transforming growth factor-beta 2 (TGF-β2), Wnt/β-Catenin, and PI3K/AKT. In addition, with regards to the elevated IOP in many POAG patients due to increased outflow resistance, Collagen type I degradation was stimulated by some miRNAs and prevented ECM deposition in TM cells. Mitochondrial dysfunction as a consequence of oxidative stress was suppressed following exposure to different miRNAs. In contrast, increased oxidative damage by inhibiting the mTOR signaling pathway was described as part of the action of selected miRNAs. Summarizing, specific miRNAs may be promising therapeutic targets for lowering or preventing oxidative stress injury in POAG patients.

Antioxidant Status and Oxidative Stress in Primary Open Angle Glaucoma and Pseudoexfoliative Glaucoma

2011 ◽  
Vol 36 (8) ◽  
pp. 713-718 ◽  
Author(s):  
Mesut Erdurmuş ◽  
Ramazan Yağcı ◽  
Ömer Atış ◽  
Remzi Karadağ ◽  
Ali Akbaş ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Status ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Open Angle ◽  
Pseudoexfoliative Glaucoma ◽  
And Oxidative Stress

scholarly journals GSTs (T1 and M1) population data in patients with glaucoma: genetic screening and ethical aspects

2019 ◽  
pp. 18-23
Author(s):  
Ferreri F.M.B ◽  
Sapienza D
Keyword(s):  
Oxidative Stress ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Gene Families ◽  
Dna Polymorphisms ◽  
Congenital Glaucoma ◽  
Antioxidant Systems ◽  
Italian Population ◽  
Open Angle ◽  
Healthy Individuals

Background and Aim: Molecular epidemiology is an interdisciplinary field concerning the analysis of biological indicators and the investigation of individual DNA polymorphisms. The glutathione-S-transferases (GSTs) are one of the most studied metabolic gene families. They are involved in the genesis of oxidative stress and many authors hypothesize that some null polymorphic variants determine increasing toxic effects in tissues. Oxidative stress and antioxidant systems are very important in the onset and progress of glaucoma, one of the leading causes of blindness worldwide. We investigate the association of null variant of GST (M1 and T1) with the risk of primary open angle glaucoma (POAG) and we considered the ethical and legal implications of genetic procedures as a screening tool. Materials and Methods: We conducted a case-control study including 103 unrelated carriers of glaucoma in a southern Italian population (living in Eastern Sicily) and 150 unrelated healthy individuals as controls, whose buccal swabs samples were genotyped for GST polymorphisms using a standardized multiplex PCR based method. Results: In patients with glaucoma (primary open angle glaucoma, POAG) null genotype of the investigated genetic polymorphisms is very common compared to the healthy individuals. The obtained data suggest an influence of the (dual) null genotype on the normal metabolic pathway in the genesis of congenital glaucoma giving to these polymorphisms the role of so-called “indicators of susceptibility”. Conclusions: We conclude that the increased frequency of null GSTs (M1, T1) in patients with glaucoma could be considered a risk factor for incidence of the disease. Screenings can be carried out only in compliance with legislative rules. Keywords: Glaucoma; Glutathione S-transferase; GSTM1; GSTT1

scholarly journals Neuroinflammation in Primary Open-Angle Glaucoma

2020 ◽  
Vol 9 (10) ◽  
pp. 3172 ◽  
Author(s):  
Stefania Vernazza ◽  
Sara Tirendi ◽  
Anna Maria Bassi ◽  
Carlo Enrico Traverso ◽  
Sergio Claudio Saccà
Keyword(s):  
Oxidative Stress ◽  
Immune Response ◽  
Trabecular Meshwork ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Glaucoma Surgery ◽  
Open Angle ◽  
Antioxidant Defences ◽  
Age Related ◽  
Wide Range

Primary open-angle glaucoma (POAG) is the second leading cause of irreversible blindness worldwide. Increasing evidence suggests oxidative damage and immune response defects are key factors contributing to glaucoma onset. Indeed, both the failure of the trabecular meshwork tissue in the conventional outflow pathway and the neuroinflammation process, which drives the neurodegeneration, seem to be linked to the age-related over-production of free radicals (i.e., mitochondrial dysfunction) and to oxidative stress-linked immunostimulatory signaling. Several previous studies have described a wide range of oxidative stress-related makers which are found in glaucomatous patients, including low levels of antioxidant defences, dysfunction/activation of glial cells, the activation of the NF-κB pathway and the up-regulation of pro-inflammatory cytokines, and so on. However, the intraocular pressure is still currently the only risk factor modifiable by medication or glaucoma surgery. This present review aims to summarize the multiple cellular processes, which promote different risk factors in glaucoma including aging, oxidative stress, trabecular meshwork defects, glial activation response, neurodegenerative insults, and the altered regulation of immune response.

Evaluation of oxidative stress markers in pathogenesis of primary open-angle glaucoma

2011 ◽  
Vol 90 (2) ◽  
pp. 231-237 ◽  
Author(s):  
Ireneusz Majsterek ◽  
Katarzyna Malinowska ◽  
Malgorzata Stanczyk ◽  
Michal Kowalski ◽  
Jan Blaszczyk ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Oxidative Stress Markers ◽  
Open Angle ◽  
Stress Markers

scholarly journals Association between Systemic Antioxidant Capacity and Retinal Vessel Diameters in Patients with Primary-Open Angle Glaucoma

Life ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 364
Author(s):  
Yuji Takayanagi ◽  
Yasuyuki Takai ◽  
Sachiko Kaidzu ◽  
Masaki Tanito
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Capacity ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Retinal Vessel ◽  
Vessel Diameter ◽  
Reactive Oxygen Metabolites ◽  
Open Angle ◽  
Pressure Independent ◽  
Retinal Vessel Diameters

The retinal vessel narrowing may be implicated in the pathogenesis of glaucoma; however, the association between systemic oxidative stress and retinal vessel diameter remains largely unknown. We examined the relationship between serum oxidative stress markers and retinal vessel diameters in eyes with primary open-angle glaucoma (POAG) and cataract, using central retinal artery equivalent (CRAE) and central retinal vein equivalent (CRVE). We included 66 eyes of 66 patients with POAG (37 men, 29 women; 65.4 ± 11.7 years) and 20 eyes of 20 patients with cataract (7 men, 13 women; 69.4 ± 9.0 years) as the controls. The CRAE (p < 0.0001), CRVE (p < 0.0001), and serum biological antioxidant potential (BAP) (p = 0.0419) were significantly lower in the POAG group compared to the controls. The BAP showed significant correlation both with CRAE (ρ = 0.2148, p = 0.0471) and systolic blood pressure (ρ = −0.2431, p = 0.0241), while neither Diacron reactive oxygen metabolites nor sulfhydryl test correlated with them. The multivariate analyses indicated that age, best corrected visual acuity, and BAP were independent factors for CRAE or CRVE. The present study suggested that lower systemic antioxidant capacity was significantly associated with the intraocular pressure-independent vascular narrowing in POAG patients. This study provided a novel insight into the pathophysiology of glaucoma and highlighted the clinical impact on systemic antioxidant treatment for patients with glaucoma.

scholarly journals Evaluation of Redox Profiles of the Serum and Aqueous Humor in Patients with Primary Open-Angle Glaucoma and Exfoliation Glaucoma

Antioxidants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1305
Author(s):  
Yuji Takayanagi ◽  
Yasuyuki Takai ◽  
Sachiko Kaidzu ◽  
Masaki Tanito
Keyword(s):  
Oxidative Stress ◽  
Aqueous Humor ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Lipid Peroxides ◽  
Redox Status ◽  
Reactive Oxygen Metabolites ◽  
Open Angle ◽  
Blood Samples ◽  
Exfoliation Glaucoma

Oxidative stress is thought to play a significant role in the development of glaucoma. However, the association between systemic and local oxidative stresses in different types of glaucoma has not been assessed fully. The current study compared the redox status in the aqueous humor (AH) and blood samples among eyes with primary open-angle glaucoma (POAG), exfoliation glaucoma (EXG), and non-glaucomatous controls to evaluate the relationship among systemic redox status, intraocular oxidative stress, and clinical backgrounds. AH and blood samples were obtained from 45 eyes of 45 Japanese subjects (15 POAG, 15 EXG, and 15 control eyes). The serum levels of lipid peroxides, ferric-reducing activity, and thiol antioxidant activity were measured by diacron reactive oxygen metabolites (dROM), biologic antioxidant potential (BAP), and sulfhydryl (SH) tests, respectively, using a free radical analyzer. The activities of cytosolic and mitochondrial forms of the superoxide dismutase (SOD) isoforms, i.e., SOD1 and SOD2, respectively, in AH and serum were measured using a multiplex bead immunoassay. In AH, SOD1 in subjects with EXG and SOD2 in those with POAG and EXG were significantly higher than in control eyes. In serum, compared to control subjects, BAP in subjects with POAG and EXG was significantly lower; SOD1 in those with EXG and SOD2 in those with POAG and EXG were significantly higher. dROM and SH did not differ significantly among the groups. The BAP values were correlated negatively with the SOD1 concentrations in AH and serum, SOD2 in the AH, intraocular pressure, and number of antiglaucoma medications. In conclusion, lower systemic antioxidant capacity accompanies up-regulation of higher local antioxidant enzymes, suggesting increased oxidative stress in eyes with OAG, especially in EXG. Determination of the systemic BAP values may help predict the redox status in AH.

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