1
|
Liu H, Bell K, Herrmann A, Arnhold S, Mercieca K, Anders F, Nagel-Wolfrum K, Thanos S, Prokosch V. Crystallins Play a Crucial Role in Glaucoma and Promote Neuronal Cell Survival in an In Vitro Model Through Modulating Müller Cell Secretion. Invest Ophthalmol Vis Sci 2022; 63:3. [PMID: 35816047 PMCID: PMC9284462 DOI: 10.1167/iovs.63.8.3] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose The aim of this study was to explore the roles of crystallins in the context of aging in glaucoma and potential mechanisms of neuroprotection in an experimental animal model of glaucoma. Methods Intraocular pressure (IOP) was significantly elevated for 8 weeks in animals at different ages (10 days, 12 weeks, and 44 weeks) by episcleral vein cauterization. Retinal ganglion cells (RGCs) were quantified by anti-Brn3a immunohistochemical staining (IHC). Proteomics using ESI-LTQ Orbitrap XL-MS was used to analyze the presence and abundance of crystallin isoforms the retinal samples, respectively. Neuroprotective property and localization of three selected crystallins CRYAB, CRYBB2, and CRYGB as most significantly changed in retina and retinal layers were determined by IHC. Their expressions and endocytic uptakes into Müller cells were analyzed by IHC and Western blotting. Müller cell secretion of neurotrophic factors into the supernatant following CRYAB, CRYBB2, and CRYGB supplementation in vitro was measured via microarray. Results IOP elevation resulted in significant RGC loss in all age groups (P < 0.001). The loss increased with aging. Proteomics analysis revealed in parallel a significant decrease of crystallin abundance – especially CRYAB, CRYBB2, and CRYGB. Significant neuroprotective effects of CRYAB, CRYBB2, and CRYGB after addition to retinal cultures were demonstrated (P < 0.001). Endocytic uptake of CRYAB, CRYBB2, and CRYGB was seen in Müller cells with subsequent increased secretion of various neurotrophic factors into the supernatant, including nerve growth factor, clusterin, and matrix metallopeptidase 9. Conclusions An age-dependent decrease in CRYAB, CRYBB2, and CRYGB abundance is found going along with increased RGC loss. Addition of CRYAB, CRYBB2, and CRYGB to culture protected RGCs in vitro. CRYAB, CRYBB2, and CRYGB were uptaken into Müller cells. Secretion of neurotrophic factors was increased as a potential mode of action.
Collapse
Affiliation(s)
- Hanhan Liu
- Department of Ophthalmology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
| | - Katharina Bell
- Singapore Eye Research Institute and Singapore National Eye Center, Singapore; Duke-NUS Medical School, Singapore
| | - Anja Herrmann
- Institute of Veterinary Anatomy, Histology and Embryology, Justus-Liebig-University Gießen, Gießen, Germany
| | - Stefan Arnhold
- Institute of Veterinary Anatomy, Histology and Embryology, Justus-Liebig-University Gießen, Gießen, Germany
| | - Karl Mercieca
- Department of Ophthalmology, University Medical Center Bonn, Bonn, Germany
| | - Fabian Anders
- Department of Ophthalmology, University Medical Centre of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Kerstin Nagel-Wolfrum
- Institute for Molecular Physiology, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Solon Thanos
- Department of Ophthalmology, Experimental Ophthalmology, University Medical Center Münster, Münster, Germany
| | - Verena Prokosch
- Department of Ophthalmology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
| |
Collapse
|
2
|
Li HL, Shan SW, Stamer WD, Li KK, Chan HHL, Civan MM, To CH, Lam TC, Do CW. Mechanistic Effects of Baicalein on Aqueous Humor Drainage and Intraocular Pressure. Int J Mol Sci 2022; 23:ijms23137372. [PMID: 35806375 PMCID: PMC9266486 DOI: 10.3390/ijms23137372] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 06/27/2022] [Accepted: 06/29/2022] [Indexed: 02/06/2023] Open
Abstract
Elevated intraocular pressure (IOP) is a major risk factor for glaucoma that results from impeded fluid drainage. The increase in outflow resistance is caused by trabecular meshwork (TM) cell dysfunction and excessive extracellular matrix (ECM) deposition. Baicalein (Ba) is a natural flavonoid and has been shown to regulate cell contraction, fluid secretion, and ECM remodeling in various cell types, suggesting the potential significance of regulating outflow resistance and IOP. We demonstrated that Ba significantly lowered the IOP by about 5 mmHg in living mice. Consistent with that, Ba increased the outflow facility by up to 90% in enucleated mouse eyes. The effects of Ba on cell volume regulation and contractility were examined in primary human TM (hTM) cells. We found that Ba (1–100 µM) had no effect on cell volume under iso-osmotic conditions but inhibited the regulatory volume decrease (RVD) by up to 70% under hypotonic challenge. In addition, Ba relaxed hTM cells via reduced myosin light chain (MLC) phosphorylation. Using iTRAQ-based quantitative proteomics, 47 proteins were significantly regulated in hTM cells after a 3-h Ba treatment. Ba significantly increased the expression of cathepsin B by 1.51-fold and downregulated the expression of D-dopachrome decarboxylase and pre-B-cell leukemia transcription factor-interacting protein 1 with a fold-change of 0.58 and 0.40, respectively. We suggest that a Ba-mediated increase in outflow facility is triggered by cell relaxation via MLC phosphorylation along with inhibiting RVD in hTM cells. The Ba-mediated changes in protein expression support the notion of altered ECM homeostasis, potentially contributing to a reduction of outflow resistance and thereby IOP.
Collapse
Affiliation(s)
- Hoi-lam Li
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
- Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
| | - Sze Wan Shan
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
- Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
- Research Centre for SHARP Vision (RCSV), The Hong Kong Polytechnic University, Hong Kong
- Research Centre for Chinese Medicine Innovation (RCMI), The Hong Kong Polytechnic University, Hong Kong
| | - W. Daniel Stamer
- Department of Ophthalmology, Duke University, Durham, NC 27708, USA;
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - King-kit Li
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
| | - Henry Ho-lung Chan
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
- Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
- Research Centre for SHARP Vision (RCSV), The Hong Kong Polytechnic University, Hong Kong
- Research Centre for Chinese Medicine Innovation (RCMI), The Hong Kong Polytechnic University, Hong Kong
| | - Mortimer M. Civan
- Department of Physiology, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Chi-ho To
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
- Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
- Research Centre for SHARP Vision (RCSV), The Hong Kong Polytechnic University, Hong Kong
- Research Centre for Chinese Medicine Innovation (RCMI), The Hong Kong Polytechnic University, Hong Kong
| | - Thomas Chuen Lam
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
- Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
- Research Centre for SHARP Vision (RCSV), The Hong Kong Polytechnic University, Hong Kong
- Research Centre for Chinese Medicine Innovation (RCMI), The Hong Kong Polytechnic University, Hong Kong
| | - Chi-wai Do
- School of Optometry, The Hong Kong Polytechnic University, Hong Kong; (H.-l.L.); (S.W.S.); (K.-k.L.); (H.H.-l.C.); (C.-h.T.); (T.C.L.)
- Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
- Research Centre for SHARP Vision (RCSV), The Hong Kong Polytechnic University, Hong Kong
- Research Centre for Chinese Medicine Innovation (RCMI), The Hong Kong Polytechnic University, Hong Kong
- Research Institute of Smart Ageing (RISA), The Hong Kong Polytechnic University, Hong Kong
- Correspondence:
| |
Collapse
|
3
|
Regeneration des Sehnerven – Wird das einmal Realität? Ophthalmologe 2022; 119:919-928. [DOI: 10.1007/s00347-022-01628-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/24/2022] [Indexed: 10/18/2022]
|
4
|
Rajeswaren V, Wong JO, Yabroudi D, Nahomi RB, Rankenberg J, Nam MH, Nagaraj RH. Small Heat Shock Proteins in Retinal Diseases. Front Mol Biosci 2022; 9:860375. [PMID: 35480891 PMCID: PMC9035800 DOI: 10.3389/fmolb.2022.860375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 03/11/2022] [Indexed: 11/29/2022] Open
Abstract
This review summarizes the latest findings on small heat shock proteins (sHsps) in three major retinal diseases: glaucoma, diabetic retinopathy, and age-related macular degeneration. A general description of the structure and major cellular functions of sHsps is provided in the introductory remarks. Their role in specific retinal diseases, highlighting their regulation, role in pathogenesis, and possible use as therapeutics, is discussed.
Collapse
Affiliation(s)
- Vivian Rajeswaren
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
| | - Jeffrey O. Wong
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
| | - Dana Yabroudi
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
| | - Rooban B. Nahomi
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
| | - Johanna Rankenberg
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
| | - Mi-Hyun Nam
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
- *Correspondence: Mi-Hyun Nam, ; Ram H. Nagaraj,
| | - Ram H. Nagaraj
- Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, School of Medicine, Aurora, CO, United States
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, Aurora, CO, United States
- *Correspondence: Mi-Hyun Nam, ; Ram H. Nagaraj,
| |
Collapse
|
5
|
Hydrogen Sulfide and β-Synuclein Are Involved and Interlinked in the Aging Glaucomatous Retina. J Ophthalmol 2020; 2020:8642135. [PMID: 32351728 PMCID: PMC7178476 DOI: 10.1155/2020/8642135] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/14/2020] [Accepted: 03/11/2020] [Indexed: 11/18/2022] Open
Abstract
Purpose Glaucoma, one of the leading causes of irreversible blindness worldwide, is a group of disorders characterized by progressive retinal ganglion cell (RGC) loss. Synucleins, a family of small proteins, have been of interest in studies of neurodegeneration and CNS. However, their roles and functions in glaucoma are still not completely understood and remain to be explored. Our previous studies showed that α-synuclein and H2S play a pivotal role in glaucoma. This study aims to (1) elucidate the potential roles and functions of synucleins in glaucoma throughout aging, (2) investigate the interaction between the synucleins and H2S, and better understand the mechanism of H2S in neuroprotection. Methods The chronic IOP elevation model was carried out in 12 animals at different ages (3 months and 14 months), and RGCs were quantified by Brn3a staining. Mass spectrometric-assisted proteomics analysis was employed to measure synuclein levels and H2S producing proteins in retina. Secondly, the acute IOP elevation model was carried out in 12 juvenile animals, with or without intravitreal injection of GYY4137 (a H2S donor). RGCs were quantified along with the abundancy of synucleins. Results RGCs and β-synuclein (SNCB) are significantly changed in old animals. Under chronic IOP elevation, there is a significant RGC loss in old animals, whereas no significant change in young animals; SNCB is significantly downregulated and 3MST is significantly upregulated in young animals due to IOP, while no significant changes in old ones are notable. Under acute IOP elevation (approx. 55 mmHg), a significant RGC loss is observed; exogenous H2S significantly reduced RGC loss and downregulated SNCB levels. Conclusion The present study indicates a strong link between ageing and SNCB regulation. In young animals SNCB is downregulated going along with less RGC loss. Furthermore, increasing endogenous H2S is effective to downregulate SNCB and is neuroprotective against acute IOP elevation.
Collapse
|
6
|
17β-Estradiol Delivered in Eye Drops: Evidence of Impact on Protein Networks and Associated Biological Processes in the Rat Retina through Quantitative Proteomics. Pharmaceutics 2020; 12:pharmaceutics12020101. [PMID: 32012756 PMCID: PMC7076522 DOI: 10.3390/pharmaceutics12020101] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/22/2020] [Accepted: 01/22/2020] [Indexed: 11/17/2022] Open
Abstract
To facilitate the development of broad-spectrum retina neuroprotectants that can be delivered through topical dosage forms, this proteomics study focused on analyzing target engagements through the identification of functional protein networks impacted after delivery of 17β-estradiol in eye drops. Specifically, the retinae of ovariectomized Brown Norway rats treated with daily eye drops of 17β-estradiol for three weeks were compared to those of vehicle-treated ovariectomized control animals. We searched the acquired raw data against a composite protein sequence database by using Mascot, as well as employed label-free quantification to detect changes in protein abundances. Our investigation using rigorous validation criteria revealed 331 estrogen-regulated proteins in the rat retina (158 were up-regulated, while 173 were down-regulated by 17β-estradiol delivered in eye drops). Comprehensive pathway analyses indicate that these proteins are relevant overall to nervous system development and function, tissue development, organ development, as well as visual system development and function. We also present 18 protein networks with associated canonical pathways showing the effects of treatments for the detailed analyses of target engagements regarding potential application of estrogens as topically delivered broad-spectrum retina neuroprotectants. Profound impact on crystallins is discussed as one of the plausible neuroprotective mechanisms.
Collapse
|
7
|
Kim JM, Lee MY, Kim JW, Lee J, Kim HJ, Cha SC, Kim NR. Open-angle Glaucoma and Sensorineural Hearing Impairment in the Korean Population. Curr Eye Res 2020; 45:992-999. [PMID: 31935130 DOI: 10.1080/02713683.2020.1712424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE This study identifies the prevalence and risk factors of sensorineural hearing loss and primary open-angle glaucoma (POAG). MATERIALS AND METHODS Patients aged 19 years or older who had undergone both ophthalmologic examination and audiometry as part of the Korea National Health and Nutrition Examination Survey V (2010-2012) were analyzed. Hearing loss was defined as the pure-tone average over 40 decibels based on the automatic hearing test to determine the threshold of airway hearing for each frequency. We investigated the prevalence of glaucoma and hearing loss when they occurred alone or simultaneously. The risk factors for concurrent glaucoma and hearing loss were examined. RESULT Among the participants, 6.6% had hearing loss alone, 2.3% had glaucoma alone, and 0.5% had both glaucoma and hearing loss. The weighted prevalence of glaucoma in patients with hearing loss was 7.5%; however, the weighted prevalence of glaucoma was 3.2% among patients without hearing loss, with a significant difference (P < .001). Multivariable logistic regression analysis revealed that the risk factors associated with concurrent glaucoma and hearing loss were age (3.786 times per 10 years, P < .001) and triglyceride level (1.002 times per 1 mg/dL, P = .028). CONCLUSION Sensorineural hearing loss and POAG are relevant. If hearing impairment and visual impairment occur together, the quality of life of the patient is worsened and the social burden is greater. Therefore, care should be taken when treating elderly patients with glaucoma.
Collapse
Affiliation(s)
- Joon Mo Kim
- Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine , Seoul, Korea
| | - Mi Yeon Lee
- Division of Biostatistics, Department of R&D Management, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine , Seoul, Korea
| | - Jong Woo Kim
- Department of Ophthalmology and Inha Vision Science Laboratory, Inha University School of Medicine , Incheon, Korea
| | - Jungmin Lee
- Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine , Seoul, Korea
| | - Hyun Ji Kim
- Department of Otorhinolaryngology, Inha University School of Medicine , Incheon, Korea
| | - Soon Cheol Cha
- Department of Ophthalmology, Yeungnam University College of Medicine , Daegu, Korea
| | - Na Rae Kim
- Department of Ophthalmology and Inha Vision Science Laboratory, Inha University School of Medicine , Incheon, Korea
| |
Collapse
|