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Qin Y, Zhang J, Babapoor-Farrokhran S, Applewhite B, Deshpande M, Megarity H, Flores-Bellver M, Aparicio-Domingo S, Ma T, Rui Y, Tzeng SY, Green JJ, Canto-Soler MV, Montaner S, Sodhi A. PAI-1 is a vascular cell-specific HIF-2-dependent angiogenic factor that promotes retinal neovascularization in diabetic patients. SCIENCE ADVANCES 2022; 8:eabm1896. [PMID: 35235351 PMCID: PMC8890718 DOI: 10.1126/sciadv.abm1896] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
For patients with proliferative diabetic retinopathy (PDR) who do not respond adequately to pan-retinal laser photocoagulation (PRP) or anti-vascular endothelial growth factor (VEGF) therapies, we hypothesized that vascular cells within neovascular tissue secrete autocrine/paracrine angiogenic factors that promote disease progression. To identify these factors, we performed multiplex ELISA angiogenesis arrays on aqueous fluid from PDR patients who responded inadequately to anti-VEGF therapy and/or PRP and identified plasminogen activator inhibitor-1 (PAI-1). PAI-1 expression was increased in vitreous biopsies and neovascular tissue from PDR eyes, limited to retinal vascular cells, regulated by the transcription factor hypoxia-inducible factor (HIF)-2α, and necessary and sufficient to stimulate angiogenesis. Using a pharmacologic inhibitor of HIF-2α (PT-2385) or nanoparticle-mediated RNA interference targeting Pai1, we demonstrate that the HIF-2α/PAI-1 axis is necessary for the development of retinal neovascularization in mice. These results suggest that targeting HIF-2α/PAI-1 will be an effective adjunct therapy for the treatment of PDR patients.
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Affiliation(s)
- Yaowu Qin
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- EENT Hospital, Fudan University, Shanghai 200031, China
| | - Jing Zhang
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou 510064, China
| | | | - Brooks Applewhite
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Monika Deshpande
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Haley Megarity
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Miguel Flores-Bellver
- CellSight Ocular Stem Cell and Regeneration Research Program, Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Silvia Aparicio-Domingo
- CellSight Ocular Stem Cell and Regeneration Research Program, Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Tao Ma
- Department of Oncology and Diagnostic Sciences, Greenebaum Cancer Center, University of Maryland, Baltimore, MD 21201, USA
| | - Yuan Rui
- Department of Biomedical Engineering, Institute for NanoBioTechnology, and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Stephany Y Tzeng
- Department of Biomedical Engineering, Institute for NanoBioTechnology, and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Jordan J Green
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- Department of Biomedical Engineering, Institute for NanoBioTechnology, and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - M Valeria Canto-Soler
- CellSight Ocular Stem Cell and Regeneration Research Program, Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Silvia Montaner
- Department of Oncology and Diagnostic Sciences, Greenebaum Cancer Center, University of Maryland, Baltimore, MD 21201, USA
| | - Akrit Sodhi
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
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Ren H, Luo JQ, Gao YC, Chen MY, Chen XP, Zhou HH, Jiang Y, Zhang W. Genetic association of hypoxia inducible factor 1-alpha ( HIF1A) Pro582Ser polymorphism with risk of diabetes and diabetic complications. Aging (Albany NY) 2020; 12:12783-12798. [PMID: 32658866 PMCID: PMC7377833 DOI: 10.18632/aging.103213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 04/17/2020] [Indexed: 04/11/2023]
Abstract
Diabetes is an age-related chronic disease associated with a number of complications, emerging as one of the major causes of morbidity and mortality worldwide. Several studies indicated that hypoxia-inducible factor 1-alpha (HIF1A) genetic polymorphisms may be associated with diabetes and diabetic complications. However, this association remains ambiguous. Thus, we performed a meta-analysis to provide more precise conclusion on this issue. Odds ratios (OR) with corresponding 95% confidence intervals (CI) were applied to assess the strength of the relationships. There was a protective association between HIF1A Pro582Ser polymorphism and diabetes under the heterozygous genetic model (OR = 0.70, 95% CI = 0.55-0.91; P = 0.007). Similar associations were observed in diabetic complications risk under the allelic (OR = 0.69, 95% CI = 0.57-0.83; P < 0.001), homozygous (OR = 0.51, 95% CI = 0.30-0.87; P = 0.014), recessive (OR = 0.73, 95% CI = 0.59-0.90; P = 0.004) and dominant (OR = 0.40, 95% CI = 0.25-0.65; P < 0.001) genetic models. No effects of the HIF1A Ala588Thr polymorphism were found in risk of diabetes and diabetic complications. Taken together, these findings revealed the protective effect of HIF1A Pro582Ser polymorphism against diabetes and diabetic complications.
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Affiliation(s)
- Huan Ren
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, P.R. China
- Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, P.R. China
- Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, P.R. China
- National Clinical Research Center for Geriatric Disorders, Changsha, P.R. China
| | - Jian-Quan Luo
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, P.R. China
| | - Yong-Chao Gao
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, P.R. China
- Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, P.R. China
- Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, P.R. China
- National Clinical Research Center for Geriatric Disorders, Changsha, P.R. China
| | - Man-Yun Chen
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, P.R. China
- Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, P.R. China
- Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, P.R. China
- National Clinical Research Center for Geriatric Disorders, Changsha, P.R. China
| | - Xiao-Ping Chen
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, P.R. China
- Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, P.R. China
- Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, P.R. China
- National Clinical Research Center for Geriatric Disorders, Changsha, P.R. China
| | - Hong-Hao Zhou
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, P.R. China
- Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, P.R. China
- Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, P.R. China
- National Clinical Research Center for Geriatric Disorders, Changsha, P.R. China
| | - Ying Jiang
- Department of Cardiothoracic Surgery, Xiangya Hospital, Central South University, Changsha, P.R. China
| | - Wei Zhang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, P.R. China
- Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, P.R. China
- Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, P.R. China
- National Clinical Research Center for Geriatric Disorders, Changsha, P.R. China
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Li HY, Yuan Y, Fu YH, Wang Y, Gao XY. Hypoxia-inducible factor-1α: A promising therapeutic target for vasculopathy in diabetic retinopathy. Pharmacol Res 2020; 159:104924. [PMID: 32464323 DOI: 10.1016/j.phrs.2020.104924] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 05/04/2020] [Accepted: 05/10/2020] [Indexed: 02/07/2023]
Abstract
Diabetic retinopathy (DR) is a serious condition that can cause blindness in diabetic patients. It is a neurovascular disease, but the pathogenesis leading to the onset of this disease is still not completely understood. However, hypoxia with subsequent neovascularization is a characteristic phenomenon observed with DR. Cellular response to hypoxia is mediated by the transcriptional regulator hypoxia-inducible factor (HIF). Long-term research has shown that one isotype of HIF, HIF-1α, may play a pivotal role under hypoxic conditions, and an increasing number of studies have shown that HIF-1α and its target genes contribute to retinal neovascularization. Therefore, targeting HIF-1α may lead to more effective DR treatments. This review describes the possible mechanisms of HIF-1α in neovascularization of DR. Furthermore, various inhibitors of HIF-1α that may have viable potential in the treatment of DR are also discussed.
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Affiliation(s)
- Hui-Yao Li
- Department of Endocrinology, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Yue Yuan
- Department of Endocrinology, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Yu-Hong Fu
- Department of Endocrinology, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Ying Wang
- Department of Endocrinology, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Xin-Yuan Gao
- Department of Endocrinology, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China.
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Mezu-Ndubuisi OJ, Wang Y, Schoephoerster J, Falero-Perez J, Zaitoun IS, Sheibani N, Gong S. Intravitreal Delivery of VEGF-A 165-loaded PLGA Microparticles Reduces Retinal Vaso-Obliteration in an In Vivo Mouse Model of Retinopathy of Prematurity. Curr Eye Res 2018; 44:275-286. [PMID: 30383455 DOI: 10.1080/02713683.2018.1542736] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE Retinopathy of prematurity (ROP) is a condition of abnormal retinal vascularization with reduced levels of vascular endothelial growth factor (VEGF) causing vaso-obliteration (Phase I), followed by abnormal neovascularization from increased VEGF (Phase II). We hypothesized that intravitreal pro-angiogenic VEGF-A in microparticle form would promote earlier retinal revascularization in an oxygen-induced ischemic retinopathy (OIR) mouse model. MATERIALS AND METHODS Wildtype mice (39) were exposed to 77% oxygen from postnatal day 7 (P7) to P12. VEGF-A165-loaded poly(lactic-co-glycolic acid) (PLGA) (n = 15) or empty PLGA (n = 14) microparticles were fabricated using a water-in-oil-in-water double emulsion method, and injected intravitreally at P13 into mice right eyes (RE). Left eyes (LE) were untreated. At P20, after retinal fluorescein angiography, vascular parameters were quantified. Retinal VEGF levels at P13 and flatmounts at P20 were performed separately. RESULTS VEGF-A165-loaded microparticles had a mean diameter of 4.2 μm. with a loading level of 8.6 weight.%. Retinal avascular area was reduced in VEGF-treated RE (39.5 ± 9.0%) compared to untreated LE (52.6 ± 6.1%, p < 0.0001) or empty microparticle-treated RE (p < 0.001) and untreated LEs (p = 0.001). Retinal arteries in VEGF-treated RE were less tortuous than untreated LE (1.08 ± 0.05 vs. 1.18 ± 0.08, p < 0.001) or empty-microparticles-treated RE (p = 0.02). Retinal arterial tortuosity was similar in the LE of VEGF and empty microparticle-treated mice (P > 0.05). Retinal vein width was similar in VEGF-treated and empty microparticle-treated RE (P > 0.9), which were each less dilated than their contralateral LE (p < 0.01). VEGF levels were higher in P13 OIR mice than RA mice (p < 0.0001). Retinal flatmounts showed vaso-obliteration and neovascularization. CONCLUSIONS Endogenous retinal VEGF is suppressed in OIR mice. Exogenous intravitreal VEGF-A165-loaded microparticles in OIR mice reduced retinal vaso-obliteration and accelerated recovery from vein dilation and arterial tortuosity. This may be beneficial in preventing Phase II ROP without systemic effects.
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Affiliation(s)
- Olachi J Mezu-Ndubuisi
- a Department of Pediatrics , University of Wisconsin-Madison , Madison , WI , USA.,b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA
| | - Yuyuan Wang
- c Department of Materials Science and Engineering and Wisconsin Institute for Discovery , University of Wisconsin-Madison , Madison , WI , USA
| | - Jamee Schoephoerster
- a Department of Pediatrics , University of Wisconsin-Madison , Madison , WI , USA
| | - Juliana Falero-Perez
- b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA
| | - Ismail S Zaitoun
- b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA
| | - Nader Sheibani
- b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA.,d Department of Biomedical Engineering , University of Wisconsin-Madison , Madison , WI , USA
| | - Shaoqin Gong
- c Department of Materials Science and Engineering and Wisconsin Institute for Discovery , University of Wisconsin-Madison , Madison , WI , USA.,d Department of Biomedical Engineering , University of Wisconsin-Madison , Madison , WI , USA
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Endothelial adenosine A2a receptor-mediated glycolysis is essential for pathological retinal angiogenesis. Nat Commun 2017; 8:584. [PMID: 28928465 PMCID: PMC5605640 DOI: 10.1038/s41467-017-00551-2] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 06/21/2017] [Indexed: 01/14/2023] Open
Abstract
Adenosine/adenosine receptor-mediated signaling has been implicated in the development of various ischemic diseases, including ischemic retinopathies. Here, we show that the adenosine A2a receptor (ADORA2A) promotes hypoxia-inducible transcription factor-1 (HIF-1)-dependent endothelial cell glycolysis, which is crucial for pathological angiogenesis in proliferative retinopathies. Adora2a expression is markedly increased in the retina of mice with oxygen-induced retinopathy (OIR). Endothelial cell-specific, but not macrophage-specific Adora2a deletion decreases key glycolytic enzymes and reduces pathological neovascularization in the OIR mice. In human primary retinal microvascular endothelial cells, hypoxia induces the expression of ADORA2A by activating HIF-2α. ADORA2A knockdown decreases hypoxia-induced glycolytic enzyme expression, glycolytic flux, and endothelial cell proliferation, sprouting and tubule formation. Mechanistically, ADORA2A activation promotes the transcriptional induction of glycolytic enzymes via ERK- and Akt-dependent translational activation of HIF-1α protein. Taken together, these findings advance translation of ADORA2A as a therapeutic target in the treatment of proliferative retinopathies and other diseases dependent on pathological angiogenesis.Pathological angiogenesis in the retina is a major cause of blindness. Here the authors show that adenosine receptor A2A drives pathological angiogenesis in the oxygen-induced retinopathy mouse model by promoting glycolysis in endothelial cells via the ERK/Akt/HIF-1α pathway, thereby suggesting new therapeutic targets for disease treatment.
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Cheng G, Tian K, Zhang L, Yang N, Xing Y, He T. S100A4 gene silencing in oxygen-induced ischemic retinopathy inhibits retinal neovascularization via down-regulation of CREB expression. Graefes Arch Clin Exp Ophthalmol 2015; 254:97-108. [DOI: 10.1007/s00417-015-3158-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 08/13/2015] [Accepted: 08/21/2015] [Indexed: 01/04/2023] Open
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Dong L, Nian H, Shao Y, Zhang Y, Li Q, Yi Y, Tian F, Li W, Zhang H, Zhang X, Wang F, Li X. PTB-associated splicing factor inhibits IGF-1-induced VEGF upregulation in a mouse model of oxygen-induced retinopathy. Cell Tissue Res 2015; 360:233-43. [PMID: 25638408 DOI: 10.1007/s00441-014-2104-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 12/21/2014] [Indexed: 12/25/2022]
Abstract
Pathological retinal neovascularization, including retinopathy of prematurity and age-related macular degeneration, is the most common cause of blindness worldwide. Insulin-like growth factor-1 (IGF-1) has a direct mitogenic effect on endothelial cells, which is the basis of angiogenesis. Vascular endothelial growth factor (VEGF) activation in response to IGF-1 is well documented; however, the molecular mechanisms responsible for the termination of IGF-1 signaling are still not completely elucidated. Here, we show that the polypyrimidine tract-binding protein-associated splicing factor (PSF) is a potential negative regulator of VEGF expression induced by IGF stimulation. Functional analysis demonstrated that ectopic expression of PSF inhibits IGF-1-stimulated transcriptional activation and mRNA expression of the VEGF gene, whereas knockdown of PSF increased IGF-1-stimulated responses. PSF recruited Hakai to the VEGF transcription complex, resulting in inhibition of IGF-1-mediated transcription. Transfection with Hakai siRNA reversed the PSF-mediated transcriptional repression of VEGF gene transcription. In summary, these results show that PSF can repress the transcriptional activation of VEGF stimulated by IGF-1 via recruitment of the Hakai complex and delineate a novel regulatory mechanism of IGF-1/VEGF signaling that may have implications in the pathogenesis of neovascularization in ocular diseases.
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Affiliation(s)
- Lijie Dong
- Tianjin Medical University Eye Hospital, Tianjin, People's Republic of China,
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Chen N, Wang J, Hu Y, Cui B, Li W, Xu G, Liu L, Liu S. MicroRNA-410 reduces the expression of vascular endothelial growth factor and inhibits oxygen-induced retinal neovascularization. PLoS One 2014; 9:e95665. [PMID: 24777200 PMCID: PMC4002426 DOI: 10.1371/journal.pone.0095665] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 03/28/2014] [Indexed: 11/18/2022] Open
Abstract
Retinal neovascularization (RNV) is an eye disease that can cause retinal detachment and even lead to blindness. RNV mainly occurs in the elderly population. The pathogenesis of RNV has been previously reported to be highly related to the expression of vascular endothelial growth factor A (VEGFA), basic fibroblast growth factor (bFGF) and other angiogenic factors. It has also been reported that VEGFA and other factors associated with RNV could be regulated by certain microRNAs (miRNA), a group of small non-coding RNAs which are able to regulate the expression of many genes in vivo. Here, we demonstrate that the miRNA miR-410 is highly expressed in mice within two weeks after birth. miR-410 could suppress VEGFA expression through interaction with the 3′UTR of the VEGFA messenger RNA. Overexpressing a miR-410 mimic effectively suppresses VEGFA expression in various cell lines. Further experiments on oxygen-induced retinopathy (OIR) in mice revealed that eye drops containing large amounts of miR-410 efficiently downregulate VEGFA expression, prevent retinal angiogenesis and effectively treat RNV. These results not only show the underlying mechanism of how miR-410 targets VEGFA but also provide a potential treatment strategy for RNV that might be used in the near future.
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Affiliation(s)
- Na Chen
- Department of Ophthalmology, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Ophthalmology, First Affiliated Hospital of Second Military Medical University, Shanghai, China
| | - Jiaqi Wang
- Clinical Research Center, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Yijun Hu
- Clinical Research Center, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Bei Cui
- Department of Sea-Air Examination Center, Navy General Hospital, Beijing, China
| | - Wenjie Li
- Department of Laboratory Diagnosis, First Affiliated Hospital of Second Military Medical University, Shanghai, China
| | - Guixia Xu
- Clinical Research Center, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Lin Liu
- Department of Ophthalmology, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- * E-mail: (LL); (SL)
| | - Shanrong Liu
- Clinical Research Center, Changhai Hospital, Second Military Medical University, Shanghai, China
- * E-mail: (LL); (SL)
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Zhang L, Jiang J, Xia X. Suppression of retinal neovascularization by small interfering RNA targeting PGC-1α. Int J Mol Med 2014; 33:1523-30. [PMID: 24682380 DOI: 10.3892/ijmm.2014.1717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 03/13/2014] [Indexed: 11/05/2022] Open
Abstract
Peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) is a key coordinator of gene programs in metabolism and energy homeostasis in mammals. The aim of this study was to determine whether PGC-1α is involved in the transcriptional regulation of retinal neovascularization in oxygen-induced retinopathy (OIR). The expression of PGC-1α in the retina of mice with OIR was detected by real-time polymerase chain reaction (PCR) and western blot analysis. Mice with OIR were administered small interfering RNA (siRNA) targeting PGC-1α by intravitreal injection, and the effects of PGC-1α siRNA were confirmed by fluorescein angiography and quantification of pre-retinal neovascular nuclei in the retinal sections. PGC-1α was upregulated at both the mRNA and protein level under hypoxic conditions. Retinal neovascularization was inhibited by PGC-1α siRNA. Furthermore, PGC-1α mRNA and protein levels were also reduced by PGC-1α siRNA, which were detected by real-time PCR and western blot analysis. The downregulation of PGC-1α expression resulted in the reduction of vascular endothelial growth factor (VEGF) expression in the mice. In conclusion, siRNA targeting PGC-1α inhibits retinal neovascularization by downregulating the expression of PGC-1α and VEGF in the murine retina. Therefore, PGC-1α represents a potential therapeutic target for ischemia-induced retinal diseases and other ocular neovascular diseases.
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Affiliation(s)
- Lixin Zhang
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Jian Jiang
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Xiaobo Xia
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
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Abu El-Asrar AM, Al-Mezaine HS, Ola MS. Pathophysiology and management of diabetic retinopathy. EXPERT REVIEW OF OPHTHALMOLOGY 2014. [DOI: 10.1586/eop.09.52] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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11
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Gao Q, Wang W, Lan Y, Chen X, Yang W, Yuan Y, Tan J, Zong Y, Jiang Z. The inhibitory effect of small interference RNA protein kinase C-alpha on the experimental proliferative vitreoretinopathy induced by dispase in mice. Int J Nanomedicine 2013; 8:1563-72. [PMID: 23626468 PMCID: PMC3632628 DOI: 10.2147/ijn.s37635] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Aim To evaluate the effects of small interference RNA protein kinase C-alpha (siRNA-PKCα) on experimental proliferative vitreoretinopathy (PVR) induced by dispase in mice. Methods C57BL/6 mice PVR models (4–6 weeks old) were induced by intravitreal injection of dispase and then equally divided into six groups. After 1 week, the five treatment groups received 2 μL, intravitreal injections of siRNA-PKCα at a concentration of 250 nM, 500 nM, 750 nM, 1000 nM, and 1500 nM, respectively, while the negative control group received 2 μL of 500 nM no-silencing siRNA. SiRNA-PKCα was transfected by a square wave electroporator. Postoperative ophthalmic observations of lens clarity and the fundus of the eyes were performed periodically. The eyeballs of the mice were enucleated and imbedded in optimal cutting temperature to perform histological and immunofluorescence analysis at the end of a 4-week observation period. Results Four weeks after the siRNA-PKCα injections, there are 100% lens dissolution and 100% PVR in the 250 nM group and 70%, 70%, 70%, and 50% PVR in the 500 nM, 750 nM, 1000 nM, and 1500 nM groups, respectively, which is significantly different from the negative group. Abnormalities in fundus appearance were related to the concentrations of siRNA-PKCα; a higher concentration of siRNA-PKCα resulted in a more normal fundus. Histological sections by hematoxylin-eosin staining of the eyes support the clinical observation. Immunofluorescence analysis showed that RPE65, glutamine synthase, glial acidic fibrillary protein, and α-smooth muscle actin were increasing in the retina with the decreasing concentration of siRNA-PKCα, indicating that intraocular siRNA-PKCα can partly inhibit changes of markers for glia cells, fibroblast cells, retinal pigment epithelium cells, and Müller cells in the process of PVR. Conclusion Gene therapy with siRNA-PKCα could effectively inhibit PVR in mice and provide us with a novel therapeutic target on PVR.
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Affiliation(s)
- Qianying Gao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, People's Republic of China.
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Xu H, Liu J, Xiong S, Le YZ, Xia X. Suppression of retinal neovascularization by lentivirus-mediated netrin-1 small hairpin RNA. Ophthalmic Res 2011; 47:163-9. [PMID: 22122983 DOI: 10.1159/000331428] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Accepted: 07/26/2011] [Indexed: 02/02/2023]
Abstract
OBJECTIVES The function of netrin-1 in pathological angiogenesis and its role in retinal neovascularization were investigated in the retinas of oxygen-induced retinopathy (OIR) mice by inhibition of netrin-1. METHODS Expression of netrin-1 mRNA and protein in the retinas of OIR mice was analyzed by quantitative RT-PCR and immunoblotting. Inhibition of retinal neovascularization was achieved by lentivirus-mediated netrin-1 small hairpin RNA (shRNA) infection. Retinal neovascularization was examined by fluorescein angiography and quantification of preretinal neovascular nuclei in retinal sections. RESULTS Both mRNA and protein expression of netrin-1 were significantly upregulated in postnatal day 17 OIR mouse retinas. Treatment of OIR mice with specific lentivirus-mediated netrin-1 shRNA dramatically reduced neovascular outgrowth into the inner limiting membrane. Neovascular tufts and nonperfused areas were also reduced. CONCLUSIONS High expression of netrin-1 was detected in the retina under ischemic conditions and played a significant role in pathological retinal angiogenesis. Therefore, netrin-1 represents a potential therapeutic target for diabetic retinopathy, retinopathy of prematurity and other ocular neovascular diseases.
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Affiliation(s)
- Huizhuo Xu
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, China
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13
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Le Moan N, Houslay DM, Christian F, Houslay MD, Akassoglou K. Oxygen-dependent cleavage of the p75 neurotrophin receptor triggers stabilization of HIF-1α. Mol Cell 2011; 44:476-90. [PMID: 22055192 PMCID: PMC3212815 DOI: 10.1016/j.molcel.2011.08.033] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 05/23/2011] [Accepted: 08/15/2011] [Indexed: 12/23/2022]
Abstract
Homeostatic control of oxygen availability allows cells to survive oxygen deprivation. Although the transcription factor hypoxia-inducible factor 1α (HIF-1α) is the main regulator of the hypoxic response, the upstream mechanisms required for its stabilization remain elusive. Here, we show that p75 neurotrophin receptor (p75(NTR)) undergoes hypoxia-induced γ-secretase-dependent cleavage to provide a positive feed-forward mechanism required for oxygen-dependent HIF-1α stabilization. The intracellular domain of p75(NTR) directly interacts with the evolutionarily conserved zinc finger domains of the E3 RING ubiquitin ligase Siah2 (seven in absentia homolog 2), which regulates HIF-1α degradation. p75(NTR) stabilizes Siah2 by decreasing its auto-ubiquitination. Genetic loss of p75(NTR) dramatically decreases Siah2 abundance, HIF-1α stabilization, and induction of HIF-1α target genes in hypoxia. p75(NTR-/-) mice show reduced HIF-1α stabilization, vascular endothelial growth factor (VEGF) expression, and neoangiogenesis after retinal hypoxia. Thus, hypoxia-induced intramembrane proteolysis of p75(NTR) constitutes an apical oxygen-dependent mechanism to control the magnitude of the hypoxic response.
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Affiliation(s)
- Natacha Le Moan
- Gladstone Institute of Neurological Disease, San Francisco, CA 94158, USA
| | - Daniel M. Houslay
- Gladstone Institute of Neurological Disease, San Francisco, CA 94158, USA
| | - Frank Christian
- Molecular Pharmacology Group, Biochemistry & Molecular Biology, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
| | - Miles D. Houslay
- Molecular Pharmacology Group, Biochemistry & Molecular Biology, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
| | - Katerina Akassoglou
- Gladstone Institute of Neurological Disease, San Francisco, CA 94158, USA
- Department of Neurology, University of California, San Francisco, CA 94158, USA
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Inhibition of hypoxia-induced retinal neovascularization in mice with short hairpin RNA targeting Rac1, possibly via blockading redox signaling. Exp Eye Res 2011; 92:473-81. [PMID: 21414312 DOI: 10.1016/j.exer.2011.03.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Revised: 03/03/2011] [Accepted: 03/06/2011] [Indexed: 02/05/2023]
Abstract
NADPH oxidase-derived reactive oxygen species are involved in angiogenesis in vitro and regulated by ras-related C3 botulinum toxin substrate 1 (Rac1). This study has employed vector-based short hairpin RNA targeting Rac1 (Rac1-shRNA) to investigate the inhibitory effect on hypoxia-induced retinal neovascularization (RN) in vivo and the underlying mechanism. pSUPER-Rac1-shRNA was intravitreally injected into the mouse model of oxygen-induced retinopathy. RN was evaluated by FITC-dextran angiography and quantitated histologically. Expressions of Rac1, nuclear factor kappa B (NF-κB) subunit p65, hypoxia-inducible factor-1 alpha (HIF-1α), and vascular endothelial growth factor (VEGF) were determined by real-time quantitative RT-PCR and western blotting. After intravitreal administration of pSUPER-Rac1-shRNA, retinal Rac1 gene expression was reduced by 72% at postnatal day 17 (P17). Retinal flat mount and quantification of the neovascular nuclei demonstrated that RN was significantly inhibited. Meanwhile, the expression levels of NF-κB and HIF-1α, the redox-dependent transcription factors, were significantly downregulated. HIF-1α and its downstream gene VEGF were found to be significantly decreased at both transcriptional and translational levels. Our findings not only suggest that Rac1 may be involved in the process of RN in mouse oxygen-induced retinopathy via regulating the redox signaling, but may also provide a novel therapeutic target for hypoxia-induced retinal neovascular diseases.
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15
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Liu JL, Xia XB, Xu HZ. Expression of FLT4 in hypoxia-induced neovascular models in vitro and in vivo. Int J Ophthalmol 2011; 4:26-9. [PMID: 22553602 DOI: 10.3980/j.issn.2222-3959.2011.01.05] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2011] [Accepted: 02/08/2011] [Indexed: 11/02/2022] Open
Abstract
AIM To investigate the expression of FLT4 in retina with oxygen induced retinopathy (OIR) and in brain endothelial cell lines (bEnd3) under hypoxia conditions in mice. METHODS Fifty-two one-week-old C57BL/6J mice were divided into control group and hypoxia group. The mice of hypoxia group were exposed to 75% oxygen for 5 days and then returned to the room air to induce retinal neovascularization. Mice in control group were raised in the environment of room air at the same time. The expressions of FLT4 mRNA and protein were checked with RT-PCR and Western Blot analysis at postnatal day 14, 17 and 21 ( P14, P17 and P21) respectively. 125mmol/L CoCl(2) were added to the culture medium of bEnd3 cell, proteins were extracted in 12, 24, 48 and 72 hours and FLT4 levels were examined by Western Blot analysis. RESULTS The mRNA and protein level of FLT4 expressed in P14 and P17 OIR mice retina statistically up-regulated as compared with those in control group, but there was no statistical difference between OIR group and control group at P21. FLT4 levels increased significantly in 12, 24 and 48 hours hypoxia intervened bEnd3 cells, its levels in 72 hours increased mildly but showed no significance. CONCLUSION FLT4 levels increase in OIR mice retinas and bEnd3 cells in hypoxia. It may play an important role in endothelial cells proliferation in hypoxia and retinal neovascularization in OIR mice.
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Affiliation(s)
- Jiao-Lian Liu
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China
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16
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Mousa SA, Mousa SS. Current status of vascular endothelial growth factor inhibition in age-related macular degeneration. BioDrugs 2010; 24:183-94. [PMID: 20210371 DOI: 10.2165/11318550-000000000-00000] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Angiogenesis, the process by which new vessels are created from pre-existing vasculature, has become the subject of intense research in recent years. Increased rates of angiogenesis are associated with several disease states, including cancer, age-related macular degeneration (AMD), psoriasis, rheumatoid arthritis, and diabetic retinopathy. Vascular endothelial growth factor (VEGF) is an important modulator of angiogenesis, and has been implicated in the pathology of a number of conditions, including AMD, diabetic retinopathy, and cancer. AMD is a progressive disease of the macula and the third major cause of blindness worldwide. If not treated appropriately, AMD can progress to involve both eyes. Until recently, the treatment options for AMD have been limited, with photodynamic therapy (PDT) the mainstay of treatment. Although PDT is effective at slowing disease progression, it rarely results in improved vision. Several therapies have been or are now being developed for neovascular AMD, with the goal of inhibiting VEGF. These VEGF inhibitors include the RNA aptamer pegaptanib, partial and full-length antibodies ranibizumab and bevacizumab, the VEGF receptor decoy aflibercept, small interfering RNA-based therapies bevasiranib and AGN 211745, sirolimus, and tyrosine kinase inhibitors, including vatalanib, pazopanib, TG 100801, TG 101095, AG 013958, and AL 39324. At present, established therapies have met with great success in reducing the vision loss associated with neovascular AMD, whereas those still under investigation offer the potential for further advances. In AMD patients, these therapies slow the rate of vision loss and in some cases increase visual acuity. Although VEGF-inhibitor therapies are a milestone in the treatment of these disease states, several concerns need to be addressed before their impact can be fully realized.
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Affiliation(s)
- Shaker A Mousa
- The Pharmaceutical Research Institute at Albany College of Pharmacy and Health Sciences, Rensselaer, New York 12144, USA.
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Inhibitory efficacy of hypoxia-inducible factor 1α short hairpin RNA plasmid DNA-loaded poly (D, L-lactide-co-glycolide) nanoparticles on choroidal neovascularization in a laser-induced rat model. Gene Ther 2009; 17:338-51. [DOI: 10.1038/gt.2009.158] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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