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Kumar A, Nagasaka Y, Jayananthan V, Zidan A, Heisler-Taylor T, Ambati J, Tamiya S, Kerur N. Therapeutic targeting of telomerase ameliorates experimental choroidal neovascularization. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167156. [PMID: 38582267 DOI: 10.1016/j.bbadis.2024.167156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 03/29/2024] [Accepted: 03/30/2024] [Indexed: 04/08/2024]
Abstract
Choroidal neovascularization (CNV) is the principal driver of blindness in neovascular age-related macular degeneration (nvAMD). Increased activity of telomerase, has been associated with endothelial cell proliferation, survival, migration, and invasion in the context of tumor angiogenesis. Expanding on this knowledge, we investigated the role of telomerase in the development of CNV in mouse model. We observed increased gene expression and activity of telomerase in mouse CNV. Genetic deficiency of the telomerase components, telomerase reverse transcriptase (Tert) and telomerase RNA component (Terc) suppressed laser-induced CNV in mice. Similarly, a small molecule inhibitor of TERT (BIBR 1532), and antisense oligonucleotides (ASOs) targeting Tert and Terc reduced CNV growth. Bone marrow chimera studies suggested that telomerase activity in non-bone marrow-derived cells is crucial for the development of CNV. Comparison of BIBR 1532 with VEGF neutralizing therapeutic strategy in mouse revealed a comparable level of angiosuppressive activity. However, when BIBR and anti-VEGF antibodies were administered as a combination at sub-therapeutic doses, a statistically significant suppression of CNV was observed. These findings underscore the potential benefits of combining sub-therapeutic doses of BIBR and anti-VEGF antibodies for developing newer therapeutic strategies for NV-AMD. Telomerase inhibition with BIBR 1532 suppressed induction of multiple cytokines and growth factors critical for neovascularization. In conclusion, our study identifies telomerase as a promising therapeutic target for treating neovascular disease of the eye and thus provides a proof of principle for further exploration of telomerase inhibition as a novel treatment strategy for nvAMD.
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Affiliation(s)
- Aman Kumar
- Department of Ophthalmology and Visual Sciences, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Yosuke Nagasaka
- Center for Advanced Vision Science, University of Virginia School of Medicine, Charlottesville, VA, USA; Department of Ophthalmology, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Vinodhini Jayananthan
- Department of Ophthalmology and Visual Sciences, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Asmaa Zidan
- Department of Ophthalmology and Visual Sciences, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Tyler Heisler-Taylor
- Department of Ophthalmology and Visual Sciences, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Jayakrishna Ambati
- Center for Advanced Vision Science, University of Virginia School of Medicine, Charlottesville, VA, USA; Department of Ophthalmology, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Shigeo Tamiya
- Department of Ophthalmology and Visual Sciences, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Nagaraj Kerur
- Department of Ophthalmology and Visual Sciences, The Ohio State University Wexner Medical Center, Columbus, OH, USA; Center for Advanced Vision Science, University of Virginia School of Medicine, Charlottesville, VA, USA; Department of Ophthalmology, University of Virginia School of Medicine, Charlottesville, VA, USA; Department of Microbial Infection and Immunity, The Ohio State University Wexner Medical Center, Columbus, OH, USA.
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Hamadmad S, Heisler-Taylor T, Goswami S, Hawthorn E, Chaurasia S, Martini D, Summitt D, Zaatari A, Urbanski EG, Bernstein K, Racine J, Satoskar A, El-Hodiri HM, Fischer AJ, Cebulla CM. Ibudilast Protects Retinal Bipolar Cells from Excitotoxic Retinal Damage and Activates the mTOR Pathway. bioRxiv 2024:2024.03.18.585556. [PMID: 38562805 PMCID: PMC10983953 DOI: 10.1101/2024.03.18.585556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Ibudilast, an inhibitor of macrophage migration inhibitory factor (MIF) and phosphodiesterase (PDE), has been recently shown to have neuroprotective effects in a variety of neurologic diseases. We utilize a chick excitotoxic retinal damage model to investigate ibudilast's potential to protect retinal neurons. Using single cell RNA-sequencing (scRNA-seq), we find that MIF, putative MIF receptors CD74 and CD44, and several PDEs are upregulated in different retinal cells during damage. Intravitreal ibudilast is well tolerated in the eye and causes no evidence of toxicity. Ibudilast effectively protects neurons in the inner nuclear layer from NMDA-induced cell death, restores retinal layer thickness on spectral domain optical coherence tomography, and preserves retinal neuron function, particularly for the ON bipolar cells, as assessed by electroretinography. PDE inhibition seems essential for ibudilast's neuroprotection, as AV1013, the analogue that lacks PDE inhibitor activity, is ineffective. scRNA-seq analysis reveals upregulation of multiple signaling pathways, including mTOR, in damaged Müller glia (MG) with ibudilast treatment compared to AV1013. Components of mTORC1 and mTORC2 are upregulated in both bipolar cells and MG with ibudilast. The mTOR inhibitor rapamycin blocked accumulation of pS6 but did not reduce TUNEL positive dying cells. Additionally, through ligand-receptor interaction analysis, crosstalk between bipolar cells and MG may be important for neuroprotection. We have identified several paracrine signaling pathways that are known to contribute to cell survival and neuroprotection and might play essential roles in ibudilast function. These findings highlight ibudilast's potential to protect inner retinal neurons during damage and show promise for future clinical translation.
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Shen H, Li J, Heisler-Taylor T, Makin R, Yang H, Mavlyutov TA, Gelfand B, Cebulla CM, Guo LW. TMEM97 ablation aggravates oxidant-induced retinal degeneration. Cell Signal 2021; 86:110078. [PMID: 34245862 PMCID: PMC8869839 DOI: 10.1016/j.cellsig.2021.110078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 07/01/2021] [Accepted: 07/05/2021] [Indexed: 10/20/2022]
Abstract
The retinal pigment epithelium (RPE) is critical to the survival of the overlying photoreceptors. Subject to light exposure and active metabolism, the RPE and photoreceptors are particularly susceptible to oxidative damage that plays an important part in age-related macular degeneration (AMD). Recent meta-analyses identified TMEM97 as a new putative AMD risk locus, though it is yet to be functionally verified. The role of TMEM97 in the retina and RPE is not known. Here we investigated TMEM97 function using the sodium iodate model of oxidant-induced retinal degeneration in TMEM97 knockout (KO) mice. We found markedly increased reactive oxygen species (ROS) and loss of photoreceptos in TMEM97 KO mouse retinas relative to wild type (WT) controls. In vitro, sodium iodate treatment of CRISPR-mediated TMEM97 KO RPE cells resulted in diminished abundance of the master antioxidant transcription factor NRF2 and its target gene product SOD2, the mitochondrial superoxide dismutase, as well as elevated ROS and apoptosis markers. Moreover, TMEM97 KO affected proteins key to mitochondrial and lysosomal stability and impeded autophagy flux. These findings suggest that the absence of TMEM97 in RPE cells disturbs redox-balancing systems, thereby heightening oxidative stress. As TMEM97 is a druggable target, this study may inspire interest in basic and translational research in the context of retinal degeneration.
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Affiliation(s)
- Hongtao Shen
- Department of Surgery, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - Jing Li
- Department of Surgery, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - Tyler Heisler-Taylor
- Department of Ophthalmology and Visual Sciences, The Ohio State University, Columbus, OH 43212, USA
| | - Ryan Makin
- Center for Advanced Vision Science, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA; Department of Ophthalmology, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - Huan Yang
- Department of Surgery, University of Wisconsin, Madison, WI 53705, USA
| | - Timur A Mavlyutov
- Department of Surgery, University of Wisconsin, Madison, WI 53705, USA
| | - Bradley Gelfand
- Center for Advanced Vision Science, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA; Department of Ophthalmology, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA; Department of Biomedical Engineering, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - Colleen M Cebulla
- Department of Ophthalmology and Visual Sciences, The Ohio State University, Columbus, OH 43212, USA.
| | - Lian-Wang Guo
- Department of Surgery, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA; Department of Ophthalmology, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
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Hamadmad S, Shah MH, Kusibati R, Kim B, Erickson B, Heisler-Taylor T, Bhattacharya SK, Abdel-Rahman MH, Cebulla CM. Significant upregulation of small heat shock protein αA-crystallin in retinal detachment. Exp Eye Res 2019; 189:107811. [PMID: 31550446 DOI: 10.1016/j.exer.2019.107811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/21/2019] [Accepted: 09/18/2019] [Indexed: 10/25/2022]
Affiliation(s)
- Sumaya Hamadmad
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Mohd Hussain Shah
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Rania Kusibati
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Bongsu Kim
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Brandon Erickson
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Tyler Heisler-Taylor
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Sanjoy K Bhattacharya
- Bascom Palmer Eye Institute, Department of Ophthalmology, The Miller School of Medicine, Miami, FL, 33136, USA
| | - Mohamed H Abdel-Rahman
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA; Division Human Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, 43240, USA
| | | | - Colleen M Cebulla
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, The Ohio State University Wexner Medical Center, 915 Olentangy River Road, Columbus, OH, 43212, USA.
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Cebulla CM, Kim B, George V, Heisler-Taylor T, Hamadmad S, Reese AY, Kothari SS, Kusibati R, Wilson H, Abdel-Rahman MH. Oral Selumetinib Does Not Negatively Impact Photoreceptor Survival in Murine Experimental Retinal Detachment. Invest Ophthalmol Vis Sci 2019; 60:349-357. [PMID: 30682205 PMCID: PMC6348998 DOI: 10.1167/iovs.18-25405] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Purpose Mitogen-activated protein kinase/extracellular signal-regulated kinase (MAPK/ERK) signaling is neuroprotective in some retinal damage models but its role in neuronal survival during retinal detachment (RD) is unclear. In addition, serous RDs are a prevalent side effect of MEK inhibitors (MEKi), blocking MAPK/ERK signaling for treatment of certain cancers. We tested the hypothesis that MEKi treatment in experimental RD would increase photoreceptor death. Methods The MEKi selumetinib was delivered daily to C57BL/6 mice at a clinically relevant dose (10 mg/mL) starting 1 day prior to creating RD with subretinal hyaluronic acid injection. Photoreceptor TUNEL and outer nuclear layer (ONL) thickness were analyzed. Phospho-ERK1/2 (pERK) distribution, glial fibrillary acidic protein (GFAP) accumulation, and Iba-1 (microglia/macrophages) were evaluated with immunofluorescence. Results pERK accumulated in the Müller glia in detached retinas, but this was effectively blocked by selumetinib. Selumetinib did not induce serous RDs at day 1 and did not increase TUNEL positive photoreceptors or further decrease ONL thickness compared to controls. Retinal gliosis was not altered, but selumetinib did block the increase in intraretinal microglia/macrophage Iba-1 fluorescence intensity and acquisition of amoeboid morphology. Conclusions MAPK/ERK is neuroprotective in some retinal damage models; in RD, selumetinib blocked Müller pERK accumulation and changed the retinal microglia/macrophage phenotype but did not alter photoreceptor survival. This is consistent with the relatively good visual acuity seen in patients developing transient retinal detachments on MEK inhibitor therapy. Compensation by other neuroprotective pathways in the retina during retinal detachment may occur in the presence of MEK inhibition.
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Affiliation(s)
- Colleen M Cebulla
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Bongsu Kim
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Valerie George
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Tyler Heisler-Taylor
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States.,Department of Biomedical Engineering, The Ohio State University College of Engineering, Columbus, Ohio, United States
| | - Sumaya Hamadmad
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Alana Y Reese
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Shaili S Kothari
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Rania Kusibati
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Hailey Wilson
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - Mohamed H Abdel-Rahman
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States.,Division of Human Genetics, Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
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6
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Cebulla CM, Stevenson W, Van Law H, Heisler-Taylor T, Hamadmad S, Shah MH, Kim B, Davidorf FH, Ohr M, Wells M, Yanoga F, Chang S, Terrell W, Miller DM, Klisovic D, Allen JB, Shah N, Geraymovych E, Tarabishy AB, Kondapalli SS, Brewington BY, Inman A, Williams D, Kusibati R, Mathias J, Vedat Y, Fernandez S, Wisely CE, Pilarski R, Abdel-Rahman MH. MIF promoter polymorphisms are associated with epiretinal membrane but not retinal detachment with PVR in an american population. Exp Eye Res 2019; 185:107667. [PMID: 31108057 DOI: 10.1016/j.exer.2019.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/22/2019] [Accepted: 05/13/2019] [Indexed: 11/18/2022]
Affiliation(s)
- Colleen M Cebulla
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA.
| | - William Stevenson
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Heather Van Law
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA; The Ohio State University College of Optometry, Columbus, OH, USA
| | - Tyler Heisler-Taylor
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Sumaya Hamadmad
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Mohd Hussain Shah
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Bongsu Kim
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Frederick H Davidorf
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Matthew Ohr
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Michael Wells
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Fatoumata Yanoga
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Susie Chang
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA; Department of Ophthalmology, Straub Medical Center, Honolulu, HI, USA
| | - William Terrell
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA; Mary Lanning Health Care, Hastings, NE, USA
| | | | | | - John B Allen
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Niraj Shah
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Elena Geraymovych
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Ahmad B Tarabishy
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Srinivas S Kondapalli
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Beatrice Y Brewington
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Andrea Inman
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Demarcus Williams
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Rania Kusibati
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Jay Mathias
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Yildiz Vedat
- The Ohio State University Biomedical Informatics, Columbus, OH, USA
| | | | - C Ellis Wisely
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA
| | - Robert Pilarski
- Division Human Genetics, The Ohio State University, Columbus, OH, USA
| | - Mohamed H Abdel-Rahman
- The Ohio State University Department of Ophthalmology and Visual Science, Havener Eye Institute, 915 Olentangy River Road, Columbus, OH, 43212, USA; Division Human Genetics, The Ohio State University, Columbus, OH, USA
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7
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Heisler-Taylor T, Kim B, Reese AY, Hamadmad S, Kusibati R, Fischer AJ, Cebulla CM. A new multichannel method quantitating TUNEL in detached photoreceptor nuclei. Exp Eye Res 2018; 176:121-129. [PMID: 29959928 DOI: 10.1016/j.exer.2018.06.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/21/2018] [Accepted: 06/26/2018] [Indexed: 11/17/2022]
Abstract
Nuclear co-localization labels are critical to ocular research. Among these, the TUNEL assay has been established as a gold standard of cell death and apoptosis. While several validated computer-based methods exist to quantitate these markers, including ImageJ Retina Analysis (RA) Toolkit and ImagePro, none verify the count with the nuclear counter stain to confirm nuclear co-localization. We established a new ImageJ-based automated multichannel thresholding (MCT) method to quantitate nuclear co-localized labeling. The MCT method was validated by comparing it with the two published TUNEL analysis in TUNEL-positive photoreceptors in an experimental retinal detachment (RD) model. RDs were induced in murine eyes and cross-sectional images of TUNEL and DAPI counter stain were obtained. Images were classified as "typical" or high density "hotspot" TUNEL regions (n = 10/group). Images were analyzed and compared between the MCT method and the published techniques including both "standard" and "high" settings of the RA Toolkit for detecting lower or higher TUNEL densities, respectively. Additional testing of the MCT method with built-in ImageJ thresholding algorithms was performed to produce fully automated measurements. All images were compared with Bland-Altman mean difference plots to assess the difference in counts and linear regression plots to assess correlation. Comparison between the MCT method and the ImagePro method were found to be well correlated (typical: R2 = 0.8972, hotspot: R2 = 0.9000) with minor to non-significant differences. The RA Toolkit settings were found to be mostly well correlated as well (standard/typical: R2 = 0.8036, standard/hotspot: R2 = 0.4309, high/typical: R2 = 0.7895, high/hotspot: R2 = 0.8738) but were often found to have significantly higher counts than the MCT. In conclusion, the MCT method compared favorably with validated computer-based methods of nuclear marker immunofluorescence quantitation and avoids staining artifacts through the incorporation of the nuclear counter stain to confirm positive cells.
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Affiliation(s)
- Tyler Heisler-Taylor
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University, Columbus, OH, USA; Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Bongsu Kim
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University, Columbus, OH, USA
| | - Alana Y Reese
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University, Columbus, OH, USA
| | - Sumaya Hamadmad
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University, Columbus, OH, USA
| | - Rania Kusibati
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University, Columbus, OH, USA
| | - Andy J Fischer
- Department of Neuroscience, The Ohio State University, Columbus, OH, USA
| | - Colleen M Cebulla
- Havener Eye Institute, Department of Ophthalmology and Visual Science, The Ohio State University, Columbus, OH, USA.
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Huang H, Sun M, Heisler-Taylor T, Kiourti A, Volakis J, Lafyatis G, He X. Stiffness-Independent Highly Efficient On-Chip Extraction of Cell-Laden Hydrogel Microcapsules from Oil Emulsion into Aqueous Solution by Dielectrophoresis. Small 2015; 11:5369-74. [PMID: 26297051 PMCID: PMC4690616 DOI: 10.1002/smll.201501388] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/23/2015] [Indexed: 05/21/2023]
Abstract
A dielectrophoresis (DEP)-based method achieves highly efficient on-chip extraction of cell-laden microcapsules of any stiffness from oil into aqueous solution. The hydrogel microcapsules can be extracted into the aqueous solution by DEP and interfacial tension forces with no trapped oil, while the encapsulated cells are free from electrical damage due to the Faraday cage effect.
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Affiliation(s)
- Haishui Huang
- Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Mingrui Sun
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Tyler Heisler-Taylor
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Asimina Kiourti
- Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - John Volakis
- Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Gregory Lafyatis
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Xiaoming He
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
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