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Lem DW, Gierhart DL, Davey PG. Carotenoids in the Management of Glaucoma: A Systematic Review of the Evidence. Nutrients 2021; 13:nu13061949. [PMID: 34204051 PMCID: PMC8228567 DOI: 10.3390/nu13061949] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 06/01/2021] [Accepted: 06/04/2021] [Indexed: 12/23/2022] Open
Abstract
Primary open-angle glaucoma (POAG) remains a leading cause of irreversible blindness globally. Recent evidence further substantiates sustained oxidative stress, and compromised antioxidant defenses are key drivers in the onset of glaucomatous neurodegeneration. Overwhelming oxidative injury is likely attributed to compounding mitochondrial dysfunction that worsens with age-related processes, causing aberrant formation of free radical species. Thus, a compromised systemic antioxidant capacity exacerbates further oxidative insult in glaucoma, leading to apoptosis, neuroinflammation, and subsequent tissue injury. The purpose of this systematic review is to investigate the neuroprotective benefits of the macular carotenoids lutein, zeaxanthin, and meso-zeaxanthin on glaucomatous neurodegeneration for the purpose of adjunctive nutraceutical treatment in glaucoma. A comprehensive literature search was conducted in three databases (PubMed, Cochrane Library, and Web of Science) and 20 records were identified for screening. Lutein demonstrated enhanced neuroprotection on retinal ganglion cell survival and preserved synaptic activity. In clinical studies, a protective trend was seen with greater dietary consumption of carotenoids and risk of glaucoma, while greater carotenoid levels in macular pigment were largely associated with improved visual performance in glaucomatous eyes. The data suggest that carotenoid vitamin therapy exerts synergic neuroprotective benefits and has the capacity to serve adjunctive therapy in the management of glaucoma.
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Affiliation(s)
- Drake W. Lem
- College of Optometry, Western University of Health Sciences, 309 E Second St, Pomona, CA 91766, USA;
| | | | - Pinakin Gunvant Davey
- College of Optometry, Western University of Health Sciences, 309 E Second St, Pomona, CA 91766, USA;
- Correspondence: ; Tel.: +1-909-469-8473
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Yu P, Dong WP, Tang YB, Chen HZ, Cui YY, Bian XL. Huperzine A lowers intraocular pressure via the M3 mAChR and provides retinal neuroprotection via the M1 mAChR: a promising agent for the treatment of glaucoma. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:332. [PMID: 33708959 PMCID: PMC7944337 DOI: 10.21037/atm-20-8093] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background Glaucoma is a neurodegenerative disease that shares similar pathological mechanisms with Alzheimer’s disease (AD). Drug treatments for glaucoma increasingly rely upon both lowering of intraocular pressure (IOP) and optic nerve protection, as lowering of IOP alone has been unsatisfactory. Huperzine A (HupA) is an acetylcholinesterase inhibitor (AChEI) used for AD. This study investigated the potential of HupA as a treatment for glaucoma. Methods The ability of HupA to lower IOP via causing pupil constriction was assessed using New Zealand rabbits. The retinal neuroprotective effects of HupA were assessed in vivo using rat retinas subjected to ischemia-reperfusion (I/R) and in vitro using primary retinal neurons (PRNs) suffering from oxygen-glucose deprivation (OGD). Results HupA caused pupil constriction in a dose-time dependent manner which was reversed by the nonselective muscarinic acetylcholine receptor (mAChR) antagonist atropine and the selective M3 mAChR antagonist 4-DAMP. However, HupA had no effect on isolated iris muscle tension and calcium flow indicating an indirect M3 mAChR mediated effect. HupA exerted a neuroprotective effect against I/R and OGD to attenuate the retinal pathological lesion, improve retinal neuronal cell viability, reverse oxidative stress injury by increasing GSH levels and SOD activity, and decreasing MDA content and reduce the retinal neuronal apoptosis by decreasing Bax/Bcl-2 ratio and caspase-3 expression with no effect on the calcium flow tests. The effects were abolished by atropine and the selective M1 mAChR antagonist pirenzepine in OGD-induced PRNs suggesting an indirect M1 mAChR-mediated effect via inhibiting AChE activity to increase endogenous ACh level. Furthermore, HupA increased phosphorylated AKT level and decreased the levels of phosphorylated JNK, P38 MAPK and ERK via M1 mAChR antagonists indicating an involvement of activating the M1 mAChR and the downstream AKT/MAPK signaling pathway in the protective effects of HupA. Conclusions HupA could significantly decrease IOP via activating M3 mAChR indirectly and produce retinal neuroprotective effect through M1 mAChR/AKT/MAPK by increasing endogenous ACh level. These investigations demonstrated that HupA was an effective drug in glaucoma treatment and the clinical application of HupA and other AChEIs for glaucoma patients should be further investigated.
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Affiliation(s)
- Ping Yu
- Department of Pharmacy, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Department of Pharmacology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wen-Pei Dong
- Department of Pharmacology, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Department of General Surgery, Hernia and Abdominal Wall Surgery Center of Shanghai Jiao Tong University, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ya-Bin Tang
- Department of Pharmacy, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hong-Zhuan Chen
- Department of Pharmacology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yong-Yao Cui
- Department of Pharmacology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiao-Lan Bian
- Department of Pharmacy, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Yang H, Fang Z, Qu X, Zhang X, Wang Y. Procyanidin Compound (PC) Suppresses Lipopolysaccharide-Induced Cervical Cancer Cell Proliferation Through Blocking the TLR4/NF-κB Pathway. Cancer Manag Res 2020; 12:497-509. [PMID: 32158256 PMCID: PMC6986416 DOI: 10.2147/cmar.s226547] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 11/20/2019] [Indexed: 12/31/2022] Open
Abstract
Purpose Evidence suggested that procyanidin compound (PC) could inhibit the progression of cervical cancer (CC); however, the mechanism still remains unclear. We aimed to study the potential mechanism of PC acting on CC cells. Patients and Methods After a 24 hr incubation of lipopolysaccharide (LPS) (1 μg/mL), human CC SiHa and HeLa cells were cultured with various concentrations (20, 40, and 80 μg/mL) of PC for 24 hrs, then the cell viability was detected using Cell Counting Kit-8 (CCK-8). The migration and invasion abilities were assessed by scratch and Transwell assays. Apoptosis and cell cycle were detected using flow cytometry. Real-time quantitative PCR (RT-qPCR) and Western blot were used for expression analysis of the inflammatory cytokines. The pathway components were measured to evaluate the involvement of toll-like receptor 4/nuclear factor kappa-light-chain-enhancer of activated B cells (TLR4/NF-κB) pathway. Results PC inhibited the LPS-primed cell viability in a dose-dependent manner. After PC treatment, cell migration and invasion were inhibited, cell number at the G2/M phase was increased. The CC cell apoptosis was triggered through upregulating levels of cleaved caspase-3 and Bax and downregulating the level of B-cell lymphoma 2 protein. A significant reduction was shown in the levels of interleukin (IL)-6, IL-1β and tumor necrosis factor (TNF)-α. Furthermore, a remarkable reduction in the ratio of TLR4 and the p-P65/t-P65 and in the progression of P65 translocation into the nucleus was observed. Conclusion Our results revealed that the inhibitory effect of PC on CC cell proliferation relies on the induction of apoptosis and inhibition of inflammatory cytokines.
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Affiliation(s)
- Haiyan Yang
- Department of Obstetrics and Gynecology, Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, 545005, People's Republic of China
| | - Ziyu Fang
- Department of Obstetrics and Gynecology, Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, 545005, People's Republic of China
| | - Xiaoli Qu
- Department of Obstetrics and Gynecology, Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, 545005, People's Republic of China
| | - Xiaoli Zhang
- Department of Obstetrics and Gynecology, Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, 545005, People's Republic of China
| | - Yifeng Wang
- Department of Obstetrics and Gynecology, Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, 545005, People's Republic of China
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Huang W, Gao F, Hu F, Huang J, Wang M, Xu P, Zhang R, Chen J, Sun X, Zhang S, Wu J. Asiatic Acid Prevents Retinal Ganglion Cell Apoptosis in a Rat Model of Glaucoma. Front Neurosci 2018; 12:489. [PMID: 30079010 PMCID: PMC6062646 DOI: 10.3389/fnins.2018.00489] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 06/29/2018] [Indexed: 01/20/2023] Open
Abstract
Asiatic acid (AA), a pentacyclic triterpene derived from the tropical medicinal plant Centella asiatica, has been widely used as an antioxidant and anti-inflammatory agent. Evidence regarding the neuroprotective properties of AA is emerging. However, the protective effects of AA and its mechanism in glaucoma are poorly understood. In the current study, we investigate the neuroprotective effect and mechanism of AA on retinal ganglion cells (RGCs) in a rat model of glaucoma. Elevated intraocular pressure (IOP) was induced in adult rats by injecting microspheres into the anterior chamber. AA was intravitreally injected into glaucomatous rats. RGC densities were analyzed by evaluating surviving RGC number of the retinal flatmounts and retinal sections, and the apoptotic cell number were evaluated by analyzing retinal sections. RGC function was assessed by measuring the photopic negative response (PhNR). Retinal Bcl-2, Bax, and cleaved caspase-3 expression were determined using a Simple Western System, real-time PCR and immunofluorescence staining. AA reduced the loss of RGCs and decreased the apoptotic RGC number. AA exerted neuroprotective effects and ameliorated retinal dysfunction in impaired RGCs in a rat model of glaucoma. AA protected RGCs by upregulating the expression of the antiapoptotic protein Bcl-2 and downregulating the expression of the pro-apoptotic proteins Bax and caspase-3. This study has provided important evidence indicating that AA may be a potential therapeutic agent for glaucoma.
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Affiliation(s)
- Wanjing Huang
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China
| | - Fengjuan Gao
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China
| | - Fangyuan Hu
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
| | - Jiancheng Huang
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,Department of Ophthalmology, The First Affiliated Hospital of Nanjing Medical University, State Key Laboratory of Reproductive Medicine, Nanjing, China
| | - Min Wang
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China
| | - Ping Xu
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
| | - Rong Zhang
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
| | - Junyi Chen
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
| | - Xinghuai Sun
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
| | - Shenghai Zhang
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
| | - Jihong Wu
- Eye Institute, Eye and ENT Hospital, College of Medicine, Fudan University, Shanghai, China.,State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Visual Impairment and Restoration, Science and Technology Commission of Shanghai Municipality, Shanghai, China.,Key Laboratory of Myopia, Ministry of Health, Shanghai, China
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Cheng HH, Ye H, Peng RP, Deng J, Ding Y. Inhibition of retinal ganglion cell apoptosis: regulation of mitochondrial function by PACAP. Neural Regen Res 2018; 13:923-929. [PMID: 29863024 PMCID: PMC5998634 DOI: 10.4103/1673-5374.232489] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) is an endogenous peptide with neuroprotective effects on retinal neurons, but the precise mechanism underlying these effects remains unknown. Considering the abundance of mitochondria in retinal ganglion cells (RGCs), we postulate that the protective effect of PACAP is associated with the regulation of mitochondrial function. RGC-5 cells were subjected to serum deprivation for 48 hours to induce apoptosis in the presence or absence of 100 nM PACAP. As revealed with the Cell Counting Kit-8 assay, PACAP at different concentrations significantly increased the viability of RGC-5 cells. PACAP also inhibited the excessive generation of reactive oxygen species in RGC-5 cells subjected to serum deprivation. We also showed by flow cytometry that PACAP inhibited serum deprivation-induced apoptosis in RGC-5 cells. The proportions of apoptotic cells and cells with mitochondria depolarization were significantly decreased with PACAP treatment. Western blot assays demonstrated that PACAP increased the levels of Bcl-2 and inhibited the compensatory increase of PAC1. Together, these data indicate protective effects of PACAP against serum deprivation-induced apoptosis in RGCs, and that the mechanism of this action is associated with maintaining mitochondrial function.
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Affiliation(s)
- Huan-Huan Cheng
- Department of Ophthalmology, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Hui Ye
- Department of Ophthalmology, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Rui-Ping Peng
- Department of Ophthalmology, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Juan Deng
- Department of Ophthalmology, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Yong Ding
- Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong Province, China
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Epigenetics and Signaling Pathways in Glaucoma. BIOMED RESEARCH INTERNATIONAL 2017; 2017:5712341. [PMID: 28210622 PMCID: PMC5292191 DOI: 10.1155/2017/5712341] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 11/28/2016] [Accepted: 12/13/2016] [Indexed: 12/22/2022]
Abstract
Glaucoma is the most common cause of irreversible blindness worldwide. This neurodegenerative disease becomes more prevalent with aging, but predisposing genetic and environmental factors also contribute to increased risk. Emerging evidence now suggests that epigenetics may also be involved, which provides potential new therapeutic targets. These three factors work through several pathways, including TGF-β, MAP kinase, Rho kinase, BDNF, JNK, PI-3/Akt, PTEN, Bcl-2, Caspase, and Calcium-Calpain signaling. Together, these pathways result in the upregulation of proapoptotic gene expression, the downregulation of neuroprotective and prosurvival factors, and the generation of fibrosis at the trabecular meshwork, which may block aqueous humor drainage. Novel therapeutic agents targeting these pathway members have shown preliminary success in animal models and even human trials, demonstrating that they may eventually be used to preserve retinal neurons and vision.
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Wang Y, Zhao L, Huo Y, Zhou F, Wu W, Lu F, Yang X, Guo X, Chen P, Deng Q, Ji B. Protective Effect of Proanthocyanidins from Sea Buckthorn (Hippophae Rhamnoides L.) Seed against Visible Light-Induced Retinal Degeneration in Vivo. Nutrients 2016; 8:nu8050245. [PMID: 27144578 PMCID: PMC4882658 DOI: 10.3390/nu8050245] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 04/12/2016] [Accepted: 04/19/2016] [Indexed: 12/25/2022] Open
Abstract
Dietary proanthocyanidins (PACs) as health-protective agents have become an important area of human nutrition research because of their potent bioactivities. We investigated the retinoprotective effects of PACs from sea buckthorn (Hippophae rhamnoides L.) seed against visible light-induced retinal degeneration in vivo. Pigmented rabbits were orally administered sea buckthorn seed PACs (50 and 100 mg/kg/day) for 14 consecutive days of pre-illumination and seven consecutive days of post-illumination. Retinal function was quantified via electroretinography 7 days after light exposure. Retinal damage was evaluated by measuring the thickness of the full-thickness retina and outer nuclear layer 7 days after light exposure. Sea buckthorn seed PACs significantly attenuated the destruction of electroretinograms and maintained the retinal structure. Increased retinal photooxidative damage was expressed by the depletion of glutathione peroxidase and catalase activities, the decrease of total antioxidant capacity level and the increase of malondialdehyde level. Light exposure induced a significant increase of inflammatory cytokines (IL-1β, TNF-α and IL-6) and angiogenesis (VEGF) levels in retina. Light exposure upregulated the expression of pro-apoptotic proteins Bax and caspase-3 and downregulated the expression of anti-apoptotic protein Bcl-2. However, sea buckthorn seed PACs ameliorated these changes induced by light exposure. Sea buckthorn seed PACs mediated the protective effect against light-induced retinal degeneration via antioxidant, anti-inflammatory and antiapoptotic mechanisms.
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Affiliation(s)
- Yong Wang
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Liang Zhao
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Yazhen Huo
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Feng Zhou
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Wei Wu
- College of Engineering, China Agricultural University, Beijing 100083, China.
| | - Feng Lu
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Xue Yang
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Xiaoxuan Guo
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Peng Chen
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China.
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Wuhan 430062, China.
| | - Qianchun Deng
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China.
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Wuhan 430062, China.
| | - Baoping Ji
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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