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Guan L, Li C, Zhang Y, Gong J, Wang G, Tian P, Shen N. Puerarin ameliorates retinal ganglion cell damage induced by retinal ischemia/reperfusion through inhibiting the activation of TLR4/NLRP3 inflammasome. Life Sci 2020; 256:117935. [PMID: 32526286 DOI: 10.1016/j.lfs.2020.117935] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 06/04/2020] [Accepted: 06/07/2020] [Indexed: 12/13/2022]
Abstract
AIMS Retinal ischemia/reperfusion (I/R) injury is common in the development of ophthalmic diseases and potentially causes blindness. In present study, the aim is to investigate the possible protective effects of puerarin on retinal I/R. MAIN METHODS Retinal I/R injury was conducted on the left eyes of male Sprague Dawley rats, which were subsequently received treatment with puerarin. After administration, retinal I/R-induced apoptosis, oxidative stress and inflammatory responses were detected. Meanwhile, we purified retinal ganglion cells (RGCs) from 7-day-old rats. After subjected RGCs to oxygen and glucose deprivation/reoxygenation (OGD/R), apoptosis and TLR4/NLRP3 inflammasome activation in RGCs were detected. KEY FINDINGS Puerarin prominently suppressed apoptosis, alleviated oxidative stress and suppressed TLR4/NLRP3 inflammasome activation in rats with retinal I/R injury. Consistent with our in vivo study, we found puerarin ameliorated retinal I/R injury through suppressing apoptosis and TLR4/NLRP3 inflammasome activation in RGCs. SIGNIFICANCE Our findings reveal that puerarin plays a protective role against retinal I/R injury by alleviating RGC damage, and is beneficial for the treatment of I/R injury-caused ophthalmic diseases.
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Affiliation(s)
- Linan Guan
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, People's Republic of China
| | - Chao Li
- Department of Pediatric Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, People's Republic of China
| | - Yi Zhang
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, People's Republic of China
| | - Jianying Gong
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, People's Republic of China
| | - Guangyu Wang
- Department of Gastrointestinal Medical Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, People's Republic of China
| | - Pei Tian
- Department of Ophthalmology, The First Affiliated Hospital of University of Science and Technology of China, Hefei, Anhui 230001, People's Republic of China; Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
| | - Ning Shen
- Library Special Collection Room, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang 150040, People's Republic of China.
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Kim H, Choi B. Nonlinear Relationship Between Blood Pressure and Glaucoma in US Adults. Am J Hypertens 2019; 32:308-316. [PMID: 30535341 DOI: 10.1093/ajh/hpy186] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 12/07/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Previous studies have reported that vascular disease is associated with glaucoma. However, the relationship between blood pressure (BP) and glaucoma has been inconsistent. We investigated whether there is a nonlinear association between BP and glaucoma in an adult population of the United States. METHODS From the 2005-2008 National Health and Nutrition Examination Survey data, 4,137 participants aged 40 years and older were chosen. BP was assessed based on a standard protocol. Glaucoma was determined using fundus photographs. Age, sex, race/ethnicity, education, poverty, antihypertensive medication, and history of cardiovascular disease were also considered in analyses. RESULTS The prevalence of glaucoma was 1.2%. In the multivariate analysis, both high (≥161 mm Hg) and low (≤110 mm Hg) levels of systolic BP were found to be positively associated with glaucoma in those without antihypertensive medications: their prevalence ratios (95% confidence intervals) for glaucoma were 6.42 (1.01-40.81) and 5.46 (1.77-16.53), respectively, when compared to the reference levels of systolic BP (111-120 mm Hg). Also, both high (≥91 mm Hg) and low (≤60 mm Hg) levels of diastolic BP were positively associated with glaucoma in those without antihypertensive medications. The prevalence of glaucoma was lowest in those having systolic BP levels of 111-120 mm Hg and diastolic BP levels of 81-90 mm Hg. However, there were no such U-shaped relationships in those with antihypertensive medications. CONCLUSIONS There was a nonlinear (U-shaped) relationship between BP and the glaucoma in those without antihypertensive medications. Future longitudinal studies are warranted to confirm our findings, including the optimal BP levels for the prevention of glaucoma.
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Affiliation(s)
- Hyojin Kim
- Department of Visual Optics, Division of Health Science, Baekseok University, Cheonan, Korea
| | - BongKyoo Choi
- Department of Medicine and Program in Public Health, University of California, Irvine, Irvine, California, USA
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Wu J, Wang R, Yang D, Tang W, Chen Z, Sun Q, Liu L, Zang R. Hydrogen postconditioning promotes survival of rat retinal ganglion cells against ischemia/reperfusion injury through the PI3K/Akt pathway. Biochem Biophys Res Commun 2018; 495:2462-2468. [DOI: 10.1016/j.bbrc.2017.12.146] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 12/23/2017] [Indexed: 12/11/2022]
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Chen HY, Chou HC, Chang SJ, Liao EC, Tsai YT, Wei YS, Li JM, Lin LH, Lin MW, Chen YJ, Chen YS, Lin CC, Wang YS, Ko ML, Chan HL. Proteomic Analysis of Various Rat Ocular Tissues after Ischemia-Reperfusion Injury and Possible Relevance to Acute Glaucoma. Int J Mol Sci 2017; 18:ijms18020334. [PMID: 28165428 PMCID: PMC5343869 DOI: 10.3390/ijms18020334] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 01/26/2017] [Accepted: 01/26/2017] [Indexed: 12/21/2022] Open
Abstract
Glaucoma is a group of eye diseases that can cause vision loss and optical nerve damage. To investigate the protein expression alterations in various intraocular tissues (i.e., the cornea, conjunctiva, uvea, retina, and sclera) during ischemia–reperfusion (IR) injury, this study performed a proteomic analysis to qualitatively investigate such alterations resulting from acute glaucoma. The IR injury model combined with the proteomic analysis approach of two-dimensional difference gel electrophoresis (2D-DIGE) and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was used to monitor the protein expression alterations in two groups of specimens (an IR injury group and a control group). The analysis results revealed 221 unique differentially expressed proteins of a total of 1481 proteins in the cornea between the two groups. In addition, 97 of 1206 conjunctival proteins, 90 of 1354 uveal proteins, 61 of 1180 scleral proteins, and 37 of 1204 retinal proteins were differentially expressed. These findings imply that different ocular tissues have different tolerances against IR injury. To sum up, this study utilized the acute glaucoma model combined with 2D-DIGE and MALDI-TOF MS to investigate the IR injury affected protein expression on various ocular tissues, and based on the ratio of protein expression alterations, the alterations in the ocular tissues were in the following order: the cornea, conjunctiva, uvea, sclera, and retina.
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Affiliation(s)
- Hsin-Yi Chen
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Hsiu-Chuan Chou
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
- Center for Teacher Education, National Tsing Hua University, Hsinchu 300, Taiwan.
- Department of Applied Science, National Hsinchu University of Education, Hsinchu 300, Taiwan.
| | - Shing-Jyh Chang
- Gynecologic Oncology Section Department of Obstetrics and Gynecology, Hsinchu Mackay Memorial Hospital, Hsinchu 300, Taiwan.
| | - En-Chi Liao
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Yi-Ting Tsai
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Yu-Shan Wei
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Ji-Min Li
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Li-Hsun Lin
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Meng-Wei Lin
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Ying-Jen Chen
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Yu-Sheng Chen
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Chih-Chun Lin
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Yi-Shiuan Wang
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
| | - Mei-Lan Ko
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
- Department of Ophthalmology, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu 300, Taiwan.
| | - Hong-Lin Chan
- Institute of Bioinformatics and Structural Biology & Department of Medical Sciences, National Tsing Hua University, Hsinchu 300, Taiwan.
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Wang R, Wu J, Chen Z, Xia F, Sun Q, Liu L. Postconditioning with inhaled hydrogen promotes survival of retinal ganglion cells in a rat model of retinal ischemia/reperfusion injury. Brain Res 2015; 1632:82-90. [PMID: 26705611 DOI: 10.1016/j.brainres.2015.12.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Revised: 11/25/2015] [Accepted: 12/09/2015] [Indexed: 12/24/2022]
Abstract
Retinal ischemia/reperfusion (I/R) injury plays a crucial role in the pathophysiology of various ocular diseases. Intraperitoneal injection or ocular instillation with hydrogen (H2)-rich saline was recently shown to be neuroprotective in the retina due to its anti-oxidative and anti-inflammatory effects. Our study aims to explore whether postconditioning with inhaled H2 can protect retinal ganglion cells (RGCs) in a rat model of retinal I/R injury. Retinal I/R injury was performed on the right eyes of rats and was followed by inhalation of 67% H2 mixed with 33% oxygen immediately after ischemia for 1h daily for one week. RGC density was counted using haematoxylin and eosin (HE) staining and retrograde labeling with cholera toxin beta (CTB). Visual function was assessed using flash visual evoked potentials (FVEP) and pupillary light reflex (PLR). Potential biomarkers of retinal oxidative stress and inflammatory responses were measured, including the expression of 4-Hydroxynonenalv (4-HNE), interleukin-1 beta (IL1-β) and tumor necrosis factor alpha (TNF-α). HE and CTB tracing showed that the survival rate of RGCs in the H2-treated group was significantly higher than the rate in the I/R group. Rats with H2 inhalation showed better visual function in assessments of FVEP and PLR. Moreover, H2 treatment significantly decreased the number of 4-HNE-stained cells in the ganglion cell layer and inhibited the retinal overexpression of IL1-β and TNF-α that was induced by retinal I/R injury. Our results demonstrate that postconditioning with inhaled high-dose H2 appears to confer neuroprotection against retinal I/R injury via anti-oxidative, anti-inflammatory and anti-apoptosis pathways.
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Affiliation(s)
- Ruobing Wang
- Department of Ophthalmology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, People's Republic of China
| | - Jiangchun Wu
- Department of Ophthalmology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, People's Republic of China
| | - Zeli Chen
- Department of Ophthalmology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, People's Republic of China
| | - Fangzhou Xia
- Department of Ophthalmology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, People's Republic of China
| | - Qinglei Sun
- Department of Ophthalmology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, People's Republic of China
| | - Lin Liu
- Department of Ophthalmology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, People's Republic of China.
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Ulbrich F, Schallner N, Coburn M, Loop T, Lagrèze WA, Biermann J, Goebel U. Argon inhalation attenuates retinal apoptosis after ischemia/reperfusion injury in a time- and dose-dependent manner in rats. PLoS One 2014; 9:e115984. [PMID: 25535961 PMCID: PMC4275290 DOI: 10.1371/journal.pone.0115984] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 12/01/2014] [Indexed: 11/30/2022] Open
Abstract
Purpose Retinal ischemia and reperfusion injuries (IRI) permanently affect neuronal tissue and function by apoptosis and inflammation due to the limited regenerative potential of neurons. Recently, evidence emerged that the noble gas Argon exerts protective properties, while lacking any detrimental or adverse effects. We hypothesized that Argon inhalation after IRI would exert antiapoptotic effects in the retina, thereby protecting retinal ganglion cells (RGC) of the rat's eye. Methods IRI was performed on the left eyes of rats (n = 8) with or without inhaled Argon postconditioning (25, 50 and 75 Vol%) for 1 hour immediately or delayed after ischemia (i.e. 1.5 and 3 hours). Retinal tissue was harvested after 24 hours to analyze mRNA and protein expression of Bcl-2, Bax and Caspase-3, NF-κB. Densities of fluorogold-prelabeled RGCs were analyzed 7 days after injury in whole-mounts. Histological tissue samples were prepared for immunohistochemistry and blood was analyzed regarding systemic effects of Argon or IRI. Statistics were performed using One-Way ANOVA. Results IRI induced RGC loss was reduced by Argon 75 Vol% inhalation and was dose-dependently attenuated by lower concentrations, or by delayed Argon inhalation (1504±300 vs. 2761±257; p<0.001). Moreover, Argon inhibited Bax and Bcl-2 mRNA expression significantly (Bax: 1.64±0.30 vs. 0.78±0.29 and Bcl-2: 2.07±0.29 vs. 0.99±0.22; both p<0.01), as well as caspase-3 cleavage (1.91±0.46 vs. 1.05±0.36; p<0.001). Expression of NF-κB was attenuated significantly. Immunohistochemistry revealed an affection of Müller cells and astrocytes. In addition, IRI induced leukocytosis was reduced significantly after Argon inhalation at 75 Vol%. Conclusion Immediate and delayed Argon postconditioning protects IRI induced apoptotic loss of RGC in a time- and dose-dependent manner, possibly mediated by the inhibition of NF-κB. Further studies need to evaluate Argon's possible role as a therapeutic option.
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Affiliation(s)
- Felix Ulbrich
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center, Freiburg, Germany
| | - Nils Schallner
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center, Freiburg, Germany
| | - Mark Coburn
- Department of Anesthesiology, University Hospital RWTH Aachen, Aachen, Germany
| | - Torsten Loop
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center, Freiburg, Germany
| | | | - Julia Biermann
- Eye Center, University Medical Center, Freiburg, Germany
| | - Ulrich Goebel
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center, Freiburg, Germany
- * E-mail:
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Vinpocetine regulates cation channel permeability of inner retinal neurons in the ischaemic retina. Neurochem Int 2014; 66:1-14. [DOI: 10.1016/j.neuint.2014.01.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 12/09/2013] [Accepted: 01/04/2014] [Indexed: 11/23/2022]
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Etanercept, a widely used inhibitor of tumor necrosis factor-α (TNF-α), prevents retinal ganglion cell loss in a rat model of glaucoma. PLoS One 2012; 7:e40065. [PMID: 22802951 PMCID: PMC3388998 DOI: 10.1371/journal.pone.0040065] [Citation(s) in RCA: 163] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 05/31/2012] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Visual loss in glaucoma is associated with pathological changes in retinal ganglion cell (RGC) axons and a slow decline in the RGC population. Age and elevated intraocular pressure (IOP) are the main risk factors for glaucomatous loss of vision. Several studies have implicated the proinflammatory cytokine tumor necrosis factor-α (TNF-α) as a link between elevated IOP and RGC death, but the cellular source of TNF-α and its causative role in RGC death remain uncertain. Here, using a rat model of glaucoma, we investigated the source of elevated TNF-α and examined whether Etanercept, a TNF-α blocker that is in common clinical use for other indications, is protective against RGC death. METHODOLOGY/PRINCIPAL FINDINGS Episcleral vein cauterization (EVC) caused intraocular pressure (IOP) to be elevated for at least 28 days. IOP elevation resulted in a dramatic increase in TNF-α levels within a few days, axonal degeneration, and a 38% loss of RGCs by 4 weeks. Immunostaining coupled with confocal microscopy showed that OHT induced robust induction of TNF-α in Iba-1-positive microglia around the optic nerve head (ONH). Despite persistent elevation of IOP, Etanercept reduced microglial activation, TNF-α levels, axon degeneration in the optic nerve, and the loss of RGCs. CONCLUSIONS/SIGNIFICANCE Ocular hypertension (OHT) triggers an inflammatory response characterized by the appearance of activated microglia around the ONH that express TNF-α. Blocking TNF-α activity with a clinically approved agent inhibits this microglial response and prevents axonal degeneration and loss of RGCs. These findings suggest a new treatment strategy for glaucoma using TNF-α antagonists or suppressors of inflammation.
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Imbalance of Neurotransmitters in the Rat Retina under Conditions of Experimental Glaucoma Neuropathy. NEUROPHYSIOLOGY+ 2012. [DOI: 10.1007/s11062-012-9240-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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10
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Teuchner B, Dimmer A, Humpel C, Amberger A, Fischer-Colbrie R, Nemeth J, Waschek JA, Kieselbach G, Kralinger M, Schmid E, Bechrakis N, Troger J. VIP, PACAP-38, BDNF and ADNP in NMDA-induced excitotoxicity in the rat retina. Acta Ophthalmol 2011; 89:670-5. [PMID: 20064115 DOI: 10.1111/j.1755-3768.2009.01828.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
PURPOSE To evaluate the effect of intravitreal injection of N-methyl-D-aspartate (NMDA) on brain-derived neurotrophic factor (BDNF), pituitary adenylate cyclase-activating peptide-38 (PACAP-38), vasoactive intestinal peptide (VIP) and the VIP-associated glial protein activity-dependent neuroprotective protein (ADNP) in the rat retina. These elements have well-documented neuroprotective properties and may thus be integrated in endogenous neuroprotective mechanisms in the retina which break down in NMDA excitotoxicity. METHODS A volume of 2 μl of 100 nmol NMDA was intravitreally injected into one eye of rats, the untreated eye served as a control. Time-dependent effects of NMDA on VIP, PACAP-38 and BDNF were detected by radioimmunoassay and ELISA, and the effect on the expression of VIP, PACAP-38 and ADNP was evaluated by quantitative RT-PCR 20 days after NMDA injection. Topical flunarizine served to find out whether the effect of NMDA is counteracted. RESULTS Compared to PACAP-38, VIP levels significantly decreased on days 1, 7, 14, 28 and 56 after NMDA injection indicating that VIPergic cells are more vulnerable than PACAP-38-expressing cells. The expression of VIP and ADNP but not of PACAP-38 was found to be reduced, and application of topical flunarizine counteracted the decrease of VIP. BDNF levels significantly increased after days 1 and 3. CONCLUSION The early upregulation of BDNF seems to act neuroprotectively and leads to a delay of ganglion cell loss. Although there is no direct evidence, the decrease of VIP and ADNP - the consequence of the presence of NMDA receptors on these peptide-expressing cells - might contribute to the breakdown of endogenous neuroprotective mechanisms given that the decrease of the VIP-related ADNP runs in parallel with the decrease of VIP. Activating and maintaining these mechanisms must be the primary aim in the therapy of diseases with retinal neuronal degeneration.
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Affiliation(s)
- Barbara Teuchner
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria
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Hypoxia induces beta-amyloid in association with death of RGC-5 cells in culture. Biochem Biophys Res Commun 2011; 410:40-4. [PMID: 21640074 DOI: 10.1016/j.bbrc.2011.05.101] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Accepted: 05/17/2011] [Indexed: 11/23/2022]
Abstract
Beta-amyloid (Aβ) derived from amyloid precursor protein (APP) has been associated with retinal degeneration in Alzheimer's disease (AD) and glaucoma. This study examined whether hypoxia exposure induces Aβ accumulation in RGC-5 cells. While levels of APP mRNA and protein significantly increased in the cells, elevated abundance of Aβ was also observed in cells and culture medium between 12 or 24 and 48h after 5% O(2) hypoxia treatment. Additionally, there is a close relationship between induction of APP and Aβ and intracellular accumulation of ROS along with loss of mitochondrial membrane potential followed by the death of RGC-5 cells in culture under hypoxia. These results suggest a possible involvement of APP and Aβ in the death of RGCs challenged by hypoxia.
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12
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Chen J, Miao Y, Wang XH, Wang Z. Elevation of p-NR2A(S1232) by Cdk5/p35 contributes to retinal ganglion cell apoptosis in a rat experimental glaucoma model. Neurobiol Dis 2011; 43:455-64. [PMID: 21554958 DOI: 10.1016/j.nbd.2011.04.019] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Revised: 04/18/2011] [Accepted: 04/22/2011] [Indexed: 01/27/2023] Open
Abstract
Glaucoma, mainly caused by high intraocular pressure (IOP), is characterized by apoptotic death of retinal ganglion cells (RGCs). We investigated the possible involvement of cyclin-dependent kinase 5 (Cdk5) and its activator p35, which have been implicated in a variety of neurological disorders, in RGC apoptosis in a rat experimental glaucoma model reproduced by blocking episcleral veins. Cholera toxin B subunit (CTB) retrogradely labeled RGCs displayed a dramatic reduction in number both in the central and peripheral retina on day 14 (D14) (P<0.05 vs. control), D21 (P<0.01 vs. control) and D28 (P<0.001 vs. control) after operation. Terminal dUTP nick end labeling (TUNEL)-positive cells were detected on D14 both in the central and peripheral regions, and numerous TUNEL-positive cells were found on D21 and D28 in both the regions (P all<0.001 vs. control). As compared with the control eyes, the expression level of Cdk5 was significantly increased on D21 (P<0.001), whereas that of p35 displayed a marked increase on D14 (P<0.01) and D21 (P<0.001). Meanwhile, both NR2A and p-NR2A(S1232) increased from D14 onwards (P<0.01 to 0.001). Co-immunoprecipitation indicated a direct interaction between Cdk5 and p-NR2A(S1232). Intraperitoneal injection of the Cdk5 inhibitor roscovitine remarkably inhibited RGC apoptosis (P<0.001 vs. vehicle group) and increased the number of CTB-labeled RGCs (P<0.05 to 0.01 vs. vehicle group) in whole flat-mounted retinas, which was accompanied by a significant decrease in expression levels of p35 and p-NR2A(S1232) (P all<0.01 vs. vehicle group). Our results suggest that elevation of p-NR2A(S1232) by Cdk5/p35 contributes to RGC apoptotic death in experimental glaucoma rats, which could be effectively ameliorated by inhibiting Cdk5/p35.
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Affiliation(s)
- Jie Chen
- Institutes of Brain Science, Institute of Neurobiology and State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai 200032, China
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Schmidt KG, Bergert H, Funk RHW. Neurodegenerative diseases of the retina and potential for protection and recovery. Curr Neuropharmacol 2010; 6:164-78. [PMID: 19305795 PMCID: PMC2647152 DOI: 10.2174/157015908784533851] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Revised: 10/29/2007] [Accepted: 11/11/2007] [Indexed: 12/27/2022] Open
Abstract
Recent advances in our understanding of the mechanisms in the cascade of events resulting in retinal cell death in ocular pathologies like glaucoma, diabetic retinopathy and age-related macular degeneration led to the common descriptive term of neurodegenerative diseases of the retina. The final common pathophysiologic pathway of these diseases includes a particular form of metabolic stress, resulting in an insufficient supply of nutrients to the respective target structures (optic nerve head, retina). During metabolic stress, glutamate is released initiating the death of neurones containing ionotropic glutamate (N-methyl-D-aspartat, NMDA) receptors present on ganglion cells and a specific type of amacrine cells. Experimental studies demonstrate that several drugs reduce or prevent the death of retinal neurones deficient of nutrients. These agents generally block NMDA receptors to prevent the action of glutamate or halt the subsequent pathophysiologic cycle resulting in cell death. The major causes for cell death following activation of NMDA receptors are the influx of calcium and sodium into cells, the generation of free radicals linked to the formation of advanced glycation endproducts (AGEs) and/or advanced lipoxidation endproducts (ALEs) as well as defects in the mitochondrial respiratory chain. Substances preventing these cytotoxic events are considered to be potentially neuroprotective.
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Affiliation(s)
- K-G Schmidt
- Department of Ophthalmology, Starnberg, Josef-Jägerhuberstr. 7, D-82319 Starnberg, Germany.
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Siesky B, Harris A, Kagemann L, Stefansson E, McCranor L, Miller B, Bwatwa J, Regev G, Ehrlich R. Ocular blood flow and oxygen delivery to the retina in primary open-angle glaucoma patients: the addition of dorzolamide to timolol monotherapy. Acta Ophthalmol 2010; 88:142-9. [PMID: 19706018 DOI: 10.1111/j.1755-3768.2009.01604.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
PURPOSE To assess the effects of adding dorzolamide to timolol monotherapy on ocular haemodynamics and retinal oxygen saturation in patients with primary open-angle glaucoma (POAG). METHODS Twenty-four patients (12 healthy, 12 with POAG) were treated with dorzolamide/timolol combination (DT) versus timolol maleate 0.5% twice daily in a randomized, crossover, double-blind study conducted over a period of 18 months. Patients received each treatment for 8 months then crossed over to the other treatment after a 1-month washout and second baseline. Goldmann applanation tonometry, Heidelberg retinal flowmetry (HRF), colour Doppler imaging (CDI) and retinal photographic oximetry were performed at each visit. RESULTS DT significantly reduced intraocular pressure (IOP) in both glaucomatous [right eye (OD) -13.15%, left eye (OS) -14.43%; p < 0.036] and non-glaucomatous (OD -12.4%, OS -13.88%; p < 0.039) patients compared to timolol after 8 months of treatment. DT significantly reduced the number of zero blood flow pixels in the superior (-39.72%; p < 0.014) and inferior (-51.44%; p < 0.008) retina in the non-glaucomatous group and inferior retina in the glaucomatous group (-55.38%, p < 0.006). The continuation of timolol monotherapy from baseline did not change (p < 0.05) any measured parameter and neither treatment had a significant effect (p < 0.05) on retinal oximetry or CDI parameters. CONCLUSION The addition of dorzolamide to timolol monotherapy decreases IOP and increases retinal blood flow in the superficial retinal vasculature in both glaucomatous and healthy patients following 8 months of treatment. The combination of increased retinal blood flow with consistent oxygen saturation may potentially increase oxygen delivery to the retina.
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Affiliation(s)
- Brent Siesky
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, USA
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15
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Downie LE, Hatzopoulos KM, Pianta MJ, Vingrys AJ, Wilkinson-Berka JL, Kalloniatis M, Fletcher EL. Angiotensin type-1 receptor inhibition is neuroprotective to amacrine cells in a rat model of retinopathy of prematurity. J Comp Neurol 2010; 518:41-63. [DOI: 10.1002/cne.22205] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Abstract
Inner retinal ischaemia is involved in the pathogenesis of major vision-threatening diseases such as retinal vein thrombosis, diabetic retinopathy and retinopathy of prematurity. However, the pathogenesis of inner retinal ischaemia has not been fully elucidated, which represents an impediment to the development and improvement of techniques to prevent and treat these diseases on a rational basis. This paper provides a comprehensive review of current knowledge of the pathophysiology of inner retinal ischaemia, including clinical, anatomical and physiological aspects of disease development. It is suggested that chronic inner retinal ischaemia caused by capillary occlusion may develop secondary to an increase in hydrostatic pressure in the vessels. Further knowledge of the pathophysiology of inner retinal ischaemia can be obtained by identifying the mechanisms that lead to increased hydrostatic pressure in the capillary bed and establishing the structural and functional basis for the different response patterns in the central and peripheral areas of the retina that develop secondary to this increased hydrostatic pressure. Further elucidation of these unknown response patterns requires both in vitro and in vivo studies of retinal vascular pathophysiology. It is conceivable that a more detailed knowledge of these response patterns may help in the design of new treatments for retinal ischaemia and its vision-threatening consequences.
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Affiliation(s)
- Toke Bek
- Department of Ophthalmology, Arhus University Hospital, Arhus, Denmark.
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17
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Scholl HPN, Fleckenstein M, Krohne TU, Holz FG. Klassifikation biomedizinischer Forschungsberichte als Grundlage evidenzbasierter Medizin in der Augenheilkunde. Ophthalmologe 2005; 102:1152-61. [PMID: 16283184 DOI: 10.1007/s00347-005-1293-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Evidence-based medicine requires careful appraisal of published data derived from experimental and clinical studies. Based on classification of biomedical research reports, evidence levels can be determined and recommendations for therapeutic decisions can be made. METHODS A classification system for clinical studies was developed. It was evaluated in classifying the reports published in Der Ophthalmologe during 2003-2004 (study design: descriptive cross-sectional study, case series). RESULTS In the 2-year interval, 70 longitudinal and 95 cross-sectional studies were published. The vast majority of the longitudinal studies were interventional cohort studies. Not considering case reports, 73% of the original articles were longitudinal prospective studies, 1% were retrospective (case-control) studies, and 26% were cross-sectional studies. CONCLUSIONS The study design of all published articles could be classified using the classification system. This classification system proves to be applicable in the context of clinical studies in ophthalmology and may be helpful in the process of critical appraisal of the literature and synthesis of clinical evidence and an evidence-based recommendation.
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