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Lai J, Li C. Review on the pharmacological effects and pharmacokinetics of scutellarein. Arch Pharm (Weinheim) 2024; 357:e2400053. [PMID: 38849327 DOI: 10.1002/ardp.202400053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 05/13/2024] [Accepted: 05/18/2024] [Indexed: 06/09/2024]
Abstract
Scutellarein is a flavonoid from Scutellaria baicalensis Georgi that has been shown to have a variety of pharmacological activities. This review aims to summarize the pharmacological and pharmacokinetic studies on scutellarein and provide useful information for relevant scholars. Pharmacological studies indicate that scutellarein possesses a diverse range of pharmacological properties, including but not limited to anti-inflammatory, antioxidant, antiviral, neuroprotective, hypoglycemic, hypolipidemic, anticancer, and cardiovascular protective effects. Further investigation reveals that the pharmacological effects of scutellarein are driven by multiple mechanisms. These mechanisms encompass the scavenging of free radicals, inhibition of the activation of inflammatory signaling pathways and expression of inflammatory mediators, inhibition of the activity of crucial viral proteins, suppression of gluconeogenesis, amelioration of insulin resistance, improvement of cerebral ischemia-reperfusion injury, induction of apoptosis in cancer cells, and prevention of myocardial hypertrophy, among others. In summary, these pharmacological studies suggest that scutellarein holds promise for the treatment of various diseases. It is imperative to conduct clinical studies to further elucidate the therapeutic effects of scutellarein. However, it is worth noting that studies on the pharmacokinetics reveal an inhibitory effect of scutellarein on uridine 5'-diphosphate glucuronide transferases and cytochrome P450 enzymes, potentially posing safety risks.
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Affiliation(s)
- Jiang Lai
- Department of Anorectal Surgery, The Third People's Hospital of Chengdu, Chengdu, China
| | - Chunxiao Li
- Department of Dermatology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
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Chen Y, Sun J, Zhang Z, Liu X, Wang Q, Yu Y. The potential effects and mechanisms of hispidulin in the treatment of diabetic retinopathy based on network pharmacology. BMC Complement Med Ther 2022; 22:141. [PMID: 35590353 PMCID: PMC9121581 DOI: 10.1186/s12906-022-03593-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 04/13/2022] [Indexed: 12/03/2022] Open
Abstract
Background Diabetic retinopathy (DR), one of the most common and severe microvascular complication of diabetes mellitus (DM), is mainly caused by diabetic metabolic disorder. So far, there is no effective treatment for DR. Eriocauli Flos, a traditional Chinese herb, has been used in treating the ophthalmic diseases including DR. However, the active ingredients and molecular mechanisms of Eriocauli Flos to treat diabetic retinopathy remain elusive. Methods Here, the systems pharmacology model was developed via constructing network approach. 8 active components which were screened by oral bioavailability (OB ≥ 30%) and drug-likeness (DL ≥ 0.18) and 154 targets were selected from Eriocauli Flos through TCMSP database. Another 3593 targets related to DR were obtained from Genecards, OMIM, TTD, and Drugbank databases. The 103 intersecting targets of DR and Eriocauli Flos were obtained by Draw Venn Diagram. In addition, protein-protein interaction network was established from STRING database and the compound-target network was constructed by Cytoscape which screened top 12 core targets with cytoNCA module. Then the overlapping targets were analyzed by GO and KEGG enrichment. Moreover, two core targets were selected to perform molecular docking simulation. Subsequently, CCK8 assay, RT-PCR and Western blotting were applied to further reveal the mechanism of new candidate active component from Eriocauli Flos in high glucose-induced HRECs. Results The results showed that the overlapping targets by GO analysis were enriched in cellular response to chemical stress, response to oxidative stress, response to reactive oxygen species, reactive oxygen species metabolic process and so on. Besides, the overlapping targets principally regulated pathways such as AGE-RAGE signaling pathway in diabetic complications, lipid atherosclerosis, fluid shear stress and atherosclerosis, and PI3K-Akt signaling pathway. Molecular docking exhibited that VEGFA and TNF-α, had good bindings to the great majority of compounds, especially the compound hispidulin. In vitro, hispidulin ameliorated high-glucose induced proliferation by down-regulating the expression of p-ERK, p-Akt, and VEGFA; meanwhile inhibited the mRNA levels of TNF-α. Conclusions In this study, through network pharmacology analysis and experimental validation, we found that hispidulin maybe has a potential targeted therapy effect for DR by decreasing the expression of p-Akt, p-ERK, and VEGFA, which resulted in ameliorating the proliferation in HRECs. Supplementary Information The online version contains supplementary material available at 10.1186/s12906-022-03593-2.
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Affiliation(s)
- Yao Chen
- Department of Histology Anatomy and HistoEmbryology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, 646000, People's Republic of China
| | - Jiaojiao Sun
- Department of Histology Anatomy and HistoEmbryology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, 646000, People's Republic of China
| | - Zhiyun Zhang
- Key Laboratory of Medical Electrophysiology of Ministry of Education and Medical China, Luzhou, Sichuan, 646000, People's Republic of China
| | - Xiaotong Liu
- Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, 646000, People's Republic of China
| | - Qiaozhi Wang
- Department of Histology Anatomy and HistoEmbryology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, 646000, People's Republic of China.
| | - Yang Yu
- Department of Histology Anatomy and HistoEmbryology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, 646000, People's Republic of China. .,Department of Clinical Medicine, School of Clinical Medicine, Southwest Medical University, Luzhou, Sichuan, 646000, People's Republic of China. .,Jiangyang City Construction College, Luzhou, Sichuan, 646000, People's Republic of China.
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Wu Q, Yan S, Wang Y, Li M, Xiao Y, Li Y. Discovery of 4'-O-methylscutellarein as a potent SARS-CoV-2 main protease inhibitor. Biochem Biophys Res Commun 2022; 604:76-82. [PMID: 35303682 PMCID: PMC8907111 DOI: 10.1016/j.bbrc.2022.03.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 03/05/2022] [Accepted: 03/09/2022] [Indexed: 12/25/2022]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has resulted in millions of deaths and seriously threatened public health and safety. Despite COVID-19 vaccines being readily popularized worldwide, targeted therapeutic agents for the treatment of this disease remain very limited. Here, we studied the inhibitory activity of the scutellarein and its methylated derivatives against SARS-CoV-2 main protease (Mpro) by the fluorescence resonance energy transfer (FRET) assay. Among all the methylated derivatives we studied, 4'-O-methylscutellarein exhibited the most promising enzyme inhibitory activity in vitro, with the half-maximal inhibitory concentration value (IC50) of 0.40 ± 0.03 μM. Additionally, the mechanism of action of the hits was further characterized through enzyme kinetic studies and molecular docking. Overall, our results implied that 4'-O-methylscutellarein could be a primary lead compound with clinical potential for the development of inhibitors against the SARS-CoV-2 Mpro.
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Affiliation(s)
- Qianqian Wu
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing 210009, China; Department of Pharmacology, School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China
| | - Shiqiang Yan
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Yujie Wang
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Maotian Li
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing 210009, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, 211198, China
| | - Yibei Xiao
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing 210009, China; Department of Pharmacology, School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China.
| | - Yingxia Li
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China.
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Kaur N, Sharma P, Aditya A, Shanavas A. Taking leads out of nature, can nano deliver us from COVID-like pandemics? Biomed Phys Eng Express 2022; 8. [PMID: 35078168 DOI: 10.1088/2057-1976/ac4ec8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/25/2022] [Indexed: 11/11/2022]
Abstract
The COVID-19 crisis has alerted the research community to re-purpose scientific tools that can effectively manage emergency pandemic situations. Researchers were never so desperate to discover a 'magic bullet' that has significant clinical benefits with minimal or no side effects. At the beginning of the pandemic, due to restricted access to traditional laboratory techniques, many research groups delved into computational screening of thousands of lead molecules that could inhibit SARS-CoV-2 at one or more stages of its infectious cycle. Several in silico studies on natural derivatives point out their potency against SARS-CoV-2 proteins. However, theoretical predictions and existing knowledge on related molecules reflect their poor oral bioavailability due to biotransformation in the gut and liver. Nanotechnology has evolved into a key field for precise and controlled delivery of various drugs that lack aqueous solubility, have low oral bioavailability and possess pronounced toxicity in their native form. In this review, we discuss various nanoformulations of natural products with favorable ADME properties, and also briefly explore nano-drug delivery to lungs, the primary site of SARS-CoV-2 infection. Natural products are also envisioned to augment nanotechnology-based 1) personnel protective equipment for ex vivo viral inactivation and 2) wearable sensors that perform rapid and non-invasive analysis of volatile organic compounds in exhaled breath of the infected person after therapeutic food consumption.
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Affiliation(s)
- Navneet Kaur
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
| | - Priyanka Sharma
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
| | - Adrija Aditya
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
| | - Asifkhan Shanavas
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
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Scutellarein protects against cardiac hypertrophy via suppressing TRAF2/NF-κB signaling pathway. Mol Biol Rep 2022; 49:2085-2095. [PMID: 34988890 DOI: 10.1007/s11033-021-07026-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 11/26/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Scutellarein, a widely studied ingredient of scutellaria herbs, has higher bioavailability and solubility than that of scutellarin. Although the scutellarein had been reported to modulate numerous biological functions, its ability in suppressing cardiac hypertrophy remains unclear. Hence, the present study attempted to investigate whether scutellarein played critical roles in preventing phenylephrine (PE)-induced cardiac hypertrophy. METHODS AND RESULTS Immunocytochemistry (ICC) was employed for evaluating the morphology of the treated cardiomyocytes. Real-time PCR and western blot were respectively applied to assess the mRNA levels and protein expression of the relevant molecules. Bioinformatics analyses were carried out to investigate the potential mechanisms by which scutellarein modulated the PE-induced cardiac hypertrophy. The results showed that Scutellarein treatment significantly inhibited PE-induced increase in H9c2 and AC16 cardiomyocyte size. Besides, scutellarein treatment also dramatically suppressed the expression of the cardiac hypertrophic markers: ANP, BNP and β-MHC. Furthermore, the effects of scutellarein on attenuating the cardiac hypertrophy might be mediated by suppressing the activity of TRAF2/NF-κB signaling pathway. CONCLUSIONS Collectively, our data indicated that scutellarein could protect against PE-induced cardiac hypertrophy via regulating TRAF2/NF-κB signaling pathway using in vitro experiments.
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Wang J, Li T, Yue C, Zhong S, Yang X, Li J, Li Y. Preparation of nanoparticles of β-cyclodextrin-loaded scutellarein anti-tumor activity research by targeting integrin αvβ3. Cancer Nanotechnol 2021. [DOI: 10.1186/s12645-021-00102-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Abstract
Background
The problems associated with the poor water solubility of anticancer drugs are one of the most important challenges in achieving effective cancer therapy. The present study was designed to evaluate the effect of scutellarein on human colon cancer cells in vitro by using a target αvβ3 novel scutellarein (Scu)-loaded niosome nanoparticle (β-CD-CL-Scu-cRGD).
Results
β-CD-CL-Scu-cRGD has a diameter of 140.2 nm and zeta potential of − 11.3 mV with constant physicochemical stability. The MTT assay showed both Scu and β-CD-CL-Scu-cRGD caused a decrease in cell proliferation and viability of LoVo, but β-CD-CL-Scu-cRGD showed better activity in vitro. Colony formation assay and flow cytometry assay showed that β-CD-CL-Scu-cRGD has a better effect on cell proliferation and apoptosis. In vivo, animal experimental results showed that β-CD-CL-Scu-cRGD can significantly inhibit tumor growth, and the bodyweight of mice decreases during the treatment of scutellarein and its derivatives. β-CD-CL-Scu-cRGD could inhibit the protein levels of Ki67 and αvβ3, thereby inhibiting tumor growth.
Conclusions
Although further in vitro and in vivo studies are necessary, our results suggested that β-CD-CL-Scu-cRGD could be an outstanding carrier to deliver Scu for potential therapeutic approaches into colon cancer.
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Inhibition of Cell Proliferation and Metastasis by Scutellarein Regulating PI3K/Akt/NF-κB Signaling through PTEN Activation in Hepatocellular Carcinoma. Int J Mol Sci 2021; 22:ijms22168841. [PMID: 34445559 PMCID: PMC8396260 DOI: 10.3390/ijms22168841] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 07/29/2021] [Accepted: 08/11/2021] [Indexed: 12/23/2022] Open
Abstract
Scutellarein (SCU) is a well-known flavone with a broad range of biological activities against several cancers. Human hepatocellular carcinoma (HCC) is major cancer type due to its poor prognosis even after treatment with chemotherapeutic drugs, which causes a variety of side effects in patients. Therefore, efforts have been made to develop effective biomarkers in the treatment of HCC in order to improve therapeutic outcomes using natural based agents. The current study used SCU as a treatment approach against HCC using the HepG2 cell line. Based on the cell viability assessment up to a 200 μM concentration of SCU, three low-toxic concentrations of (25, 50, and 100) μM were adopted for further investigation. SCU induced cell cycle arrest at the G2/M phase and inhibited cell migration and proliferation in HepG2 cells in a dose-dependent manner. Furthermore, increased PTEN expression by SCU led to the subsequent downregulation of PI3K/Akt/NF-κB signaling pathway related proteins. In addition, SCU regulated the metastasis with EMT and migration-related proteins in HepG2 cells. In summary, SCU inhibits cell proliferation and metastasis in HepG2 cells through PI3K/Akt/NF-κB signaling by upregulation of PTEN, suggesting that SCU might be used as a potential agent for HCC therapy.
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Sun X, Lu Y, Lei T. TPTEP1 suppresses high glucose-induced dysfunction in retinal vascular endothelial cells by interacting with STAT3 and targeting VEGFA. Acta Diabetol 2021; 58:759-769. [PMID: 33576890 DOI: 10.1007/s00592-020-01663-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/17/2020] [Indexed: 12/17/2022]
Abstract
AIMS Diabetic retinopathy (DR) is a vascular complication of diabetes mellitus that causes visual impairment and blindness. Long noncoding RNAs (lncRNAs) have been revealed to be involved in biological processes of several diseases including DR. We designed this study to investigate the specific role of TPTEP1 in DR. METHODS First, we mimicked diabetic conditions with high glucose (HG) stimulation of human retinal vascular endothelial cells (HRVECs) and measured TPTEP1 expression in HG-stimulated HRVECs using RT-qPCR analysis. Then, CCK-8, Transwell, and Matrigel tube formation assays as well as western blot analysis were performed to reveal the biological functions of TPTEP1 in HG-stimulated HRVECs. Subsequently, bioinformatics analysis, RNA pull down, luciferase reporter and ChIP assays as well as western blot analysis evaluated the relationship of TPTEP1, signal transducer and activator of transcription 3 (STAT3) and vascular endothelial growth factor A (VEGFA) in HG-stimulated HRVECs. Finally, to verify the regulation of the TPTEP1/STAT3/VEGFA axis in HG-stimulated HRVECs, rescue experiments were carried out in HG-stimulated HRVECs. RESULTS TPTEP1 presented a significant downregulation in HG-stimulated HRVECs. Additionally, TPTEP1 overexpression reduced viability, migration, and angiogenesis in HG-stimulated HRVECs. Moreover, TPTEP1 suppressed phosphorylation and nuclear translocation of STAT3, and thereby downregulated VEGFA mRNA and protein levels. Furthermore, TPTEP1 overexpression-mediated suppression of HG-induced dysfunction in HRVECs was countervailed by STAT3 upregulation or VEGFA upregulation. CONCLUSIONS TPTEP1 alleviated HG-induced dysfunction in HRVECs via interacting with STAT3 and targeting VEGFA.
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Affiliation(s)
- Xiaoping Sun
- Department of Ophthalmology, Zhengzhou Central Hospital Affiliated To Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Yuebing Lu
- Department of Ophthalmology, Henan Children's Hospital, Children's Hospital Affiliated of Zhengzhou University, Zhengzhou, 450053, Henan, China
| | - Tao Lei
- Department of Endocrinology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, No. 164, Lanxi Road, Shanghai, 200062, China.
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Li H, Mei XY, Wang MN, Zhang TY, Zhang Y, Lu B, Sheng YC. Scutellarein alleviates the dysfunction of inner blood-retinal-barrier initiated by hyperglycemia-stimulated microglia cells. Int J Ophthalmol 2020; 13:1538-1545. [PMID: 33078102 DOI: 10.18240/ijo.2020.10.05] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 07/27/2020] [Indexed: 12/22/2022] Open
Abstract
AIM To investigate the alleviation of scutellarein (SN) against inner blood-retinal-barrier (iBRB) dysfunction in microglia cells stimulated by hyperglycemia and to elucidate the engaged mechanism. METHODS Microglia BV2 cells were stimulated by using 25 mmol/L D-glucose. The same concentration of mannitol (25 mmol/L) was applied as an isotonic contrast. Real-time PCR, Western-blot assay and immunofluorescence staining assay was performed. The dysfunction of iBRB in vitro was detected by using transendothelial electrical resistance (TEER) assay. Additionally, the leakage of fluorescein isothiocyanate (FITC)-conjugated dextran (70 kDa) was detected. RESULTS SN abrogated microglia BV2 cells activation and reduced the phosphorylated activation of extracellular signal-regulated protein kinase (ERK)1/2. SN also decreased the transcriptional activation of nuclear factor κB (NFκB) and the elevated expression of tumor necrosis factor α (TNFα), interleukin (IL)-6 and IL-1β in BV2 cells treated with D-glucose (25 mmol/L). SN attenuated iBRB dysfunction in human retinal endothelial cells (HRECs) or choroid-retinal endothelial RF/6A cells when those cells were treated with TNFα, IL-1β or IL-6, or co-cultured with microglia cells stimulated by D-glucose. Moreover, SN restored the decreased protein expression of tight junctions (TJs) in TNFα-treated HRECs and RF/6A cells. CONCLUSION SN not only alleviate iBRB dysfunction via directly inhibiting retinal endothelial injury caused by TNFα, IL-1β or IL-6, but also reduce the release of TNFα, IL-1β and IL-6 from microglia cells by abrogating hyperglycemia-mediated the activation of microglia cells.
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Affiliation(s)
- Han Li
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.,Center for Drug Safety Evaluation and Research, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Xi-Yu Mei
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Meng-Na Wang
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Tian-Yu Zhang
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Yue Zhang
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Bin Lu
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Yu-Chen Sheng
- The MOE Key Laboratory for Standardization of Chinese Medicines, Shanghai Key Laboratory of Compound Chinese Medicines and the SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.,Center for Drug Safety Evaluation and Research, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
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Liu G, Zhou S, Li X, Ding X, Tian M. Inhibition of hsa_circ_0002570 suppresses high-glucose-induced angiogenesis and inflammation in retinal microvascular endothelial cells through miR-1243/angiomotin axis. Cell Stress Chaperones 2020; 25:767-777. [PMID: 32319024 PMCID: PMC7479666 DOI: 10.1007/s12192-020-01111-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 04/13/2020] [Accepted: 04/15/2020] [Indexed: 02/08/2023] Open
Abstract
Diabetic retinopathy (DR) is the most severe microvascular complication of diabetes and a major cause of visual impairment and blindness. However, the treatment for DR is still limited. Our study aimed to explore the role of circular RNA_0002570 in DR. First, we predicted the potential microRNA and mRNA that could bind to circ_0002570 and identified the miR-1243 and angiomotin gene; then, we used RT-PCR and Western blot to measure their expression. Next, we evaluated the abilities of proliferation, migration, and angiogenesis in vitro in human retinal microvascular endothelial cells (hRMECs) by CCK-8, transwell assay, and tube formation assay, respectively. To analyze the relationship among miR-1243, circ_0002570, and angiomotin, RNA pull-down and luciferase assay were performed. Our results showed that, in DR patients and high-glucose-induced hRMECs, miR-1243, circ_0002570, and angiomotin were all abnormally expressed. MiR-1243 could directly and competitively bind to both circ_0002570 and angiomotin mRNA to inhibit their expression. Moreover, circ_0002570 suppressed the abilities of proliferation, migration, and angiogenesis in hRMECs induced by high glucose, which was dependent on miR-1243-angiomotin axis. Furthermore, circ_0002570 could upregulate angiomotin by targeting miR-1243 to mediate the dysfunction of hRMECs induced by high glucose. In conclusion, circ_0002570 might serve as a potential target for diagnosis and treatment for DR.
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Affiliation(s)
- Guodan Liu
- Department of Ophthalmology, the Fourth Affiliated Hospital of Harbin Medical University, No. 37 Yiyuan Street, Nangang District, Harbin, 150000, Heilongjiang, China
| | - Shifeng Zhou
- Department of Emergency Surgery, the First Affiliated Hospital of Harbin Medical University, No. 23 Postal Street, Nangang District, Harbin, 150000, Heilongjiang, China
| | - Xinge Li
- Department of Ophthalmology, the Fourth Affiliated Hospital of Harbin Medical University, No. 37 Yiyuan Street, Nangang District, Harbin, 150000, Heilongjiang, China
| | - Xuchen Ding
- Department of Ophthalmology, the Fourth Affiliated Hospital of Harbin Medical University, No. 37 Yiyuan Street, Nangang District, Harbin, 150000, Heilongjiang, China
| | - Miao Tian
- Department of Ophthalmology, the Fourth Affiliated Hospital of Harbin Medical University, No. 37 Yiyuan Street, Nangang District, Harbin, 150000, Heilongjiang, China.
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Lazzara F, Trotta MC, Platania CBM, D'Amico M, Petrillo F, Galdiero M, Gesualdo C, Rossi S, Drago F, Bucolo C. Stabilization of HIF-1α in Human Retinal Endothelial Cells Modulates Expression of miRNAs and Proangiogenic Growth Factors. Front Pharmacol 2020; 11:1063. [PMID: 32848728 PMCID: PMC7396674 DOI: 10.3389/fphar.2020.01063] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 06/30/2020] [Indexed: 12/12/2022] Open
Abstract
Retinal hypoxia is one of the causative factors of diabetic retinopathy and is also one of the triggers of VEGF release. We hypothesized that specific dysregulated miRNAs in diabetic retinopathy could be linked to hypoxia-induced damage in human retinal endothelial cells (HRECs). We investigated in HRECs the effects of chemical (CoCl2) hypoxia on the expression of HIF-1α, VEGF, PlGF, and of a focused set of miRNAs. We found that miR-20a-5p, miR-20b-5p, miR-27a-3p, miR-27b-3p, miR-206-3p, miR-381-3p correlated also with expression of TGFβ signaling pathway genes in HRECs, challenged with chemical hypoxic stimuli. In conclusion, our data suggest that retinal angiogenesis would be promoted, at least under HIF-1α activation, by upregulation of PlGF and other factors such as miRNAs, VEGFA, and TGFβ1.
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Affiliation(s)
- Francesca Lazzara
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Maria Consiglia Trotta
- Department of Experimental Medicine, Division of Pharmacology, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Chiara Bianca Maria Platania
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Michele D'Amico
- Department of Experimental Medicine, Division of Pharmacology, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Francesco Petrillo
- Department of Experimental Medicine, Division of Pharmacology, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Marilena Galdiero
- Department of Experimental Medicine, Division of Pharmacology, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Carlo Gesualdo
- Eye Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Settimio Rossi
- Eye Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Filippo Drago
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy.,Center for Research in Ocular Pharmacology-CERFO, University of Catania, Catania, Italy
| | - Claudio Bucolo
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy.,Center for Research in Ocular Pharmacology-CERFO, University of Catania, Catania, Italy
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Zhu K, Hu X, Chen H, Li F, Yin N, Liu AL, Shan K, Qin YW, Huang X, Chang Q, Xu GZ, Wang Z. Downregulation of circRNA DMNT3B contributes to diabetic retinal vascular dysfunction through targeting miR-20b-5p and BAMBI. EBioMedicine 2019; 49:341-353. [PMID: 31636010 PMCID: PMC6945224 DOI: 10.1016/j.ebiom.2019.10.004] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 09/25/2019] [Accepted: 10/02/2019] [Indexed: 12/16/2022] Open
Abstract
Background Diabetic retinopathy, a vascular complication of diabetes mellitus, is the leading cause of visual impairment and blindness. circRNAs act as competing endogenous RNA, sponging target miRNA and thus influencing mRNA expression in vascular diseases. We investigated whether and how circDNMT3B is involved in retinal vascular dysfunction under diabetic conditions. Methods qRT-PCR was performed to detect expression of circDNMT3B, miR-20b-5p, and BAMBI in retinal microvascular endothelial cells under diabetic conditions. Western blot, Cell Counting Kit-8, Transwell, Matrigel tube formation, and retinal trypsin digestion assays were conducted to explore the roles of circDNMT3B/miR-20b-5p/BAMBI in retinal vascular dysfunction. Bioinformatics analysis and luciferase reporter, siRNA, and overexpression assays were used to reveal the mechanisms of the circDNMT3B/miR-20b-5p/BAMBI interaction. Electroretinograms were used to evaluate visual function. Findings Upregulation of miR-20b-5p under diabetic conditions promoted proliferation, migration, and tube formation of human retinal microvascular endothelial cells (HRMECs), which was mediated by downregulated BAMBI. Under diabetic conditions, circDNMT3B, which acts as a sponge of miR-20b-5p, is downregulated. circDNMT3B overexpression reduced retinal acellular capillary number and alleviated visual damage in diabetic rats. Changes in expression of circDNMT3B and miR-20b-5p were confirmed in the proliferative fibrovascular membranes of patients with diabetic retinopathy. Interpretation Downregulation of circDNMT3B contributes to vascular dysfunction in diabetic retinas through regulating miR-20b-5p and BAMBI, providing a potential treatment strategy for diabetic retinopathy. Funding National Natural Science Foundation of China, National Key Basic Research Program of China, Shanghai Municipal Science and Technology Major Project, and ZJLab.
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Affiliation(s)
- Ke Zhu
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China
| | - Xin Hu
- Department of Neurology, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Han Chen
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China
| | - Fang Li
- Department of Neurology, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Ning Yin
- Department of Neurology, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Ai-Lin Liu
- Department of Neurology, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Kun Shan
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China
| | - Yao-Wu Qin
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China
| | - Xin Huang
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China
| | - Qing Chang
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China
| | - Ge-Zhi Xu
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Key Laboratory of Visual Impairment and Restoration, NHC Key Laboratory of Myopia, Key Laboratory of Myopia, Chinese Academy of Medical Sciences, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200031, China.
| | - Zhongfeng Wang
- Department of Neurology, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Zhongshan Hospital, Fudan University, Shanghai 200032, China.
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Zhang W, Yi D, Gao K, Liu M, Yang J, Liao X, Yang B. hydrolysis of Scutellarin and Related Glycosides to Scutellarein and the Corresponding Aglycones. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/174751914x14017253941699] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Wei Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
| | - Dong Yi
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
| | - Kai Gao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
| | - Manshuo Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
| | - Jian Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
| | - Xiali Liao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
| | - Bo Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P.R. China
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Sang Eun H, Seong Min K, Ho Jeong L, Vetrivel P, Venkatarame Gowda Saralamma V, Jeong Doo H, Eun Hee K, Sang Joon L, Gon Sup K. Scutellarein Induces Fas-Mediated Extrinsic Apoptosis and G2/M Cell Cycle Arrest in Hep3B Hepatocellular Carcinoma Cells. Nutrients 2019; 11:nu11020263. [PMID: 30682875 PMCID: PMC6412708 DOI: 10.3390/nu11020263] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/22/2019] [Accepted: 01/23/2019] [Indexed: 12/13/2022] Open
Abstract
Scutellarein (SCU), a flavone found in the perennial herb Scutellaria baicalensis, is known for a wide range of biological activities. In the present study, we investigated the effects of treatment with SCU flavonoids on inducing apoptosis via the extrinsic pathway in Hep3B cells. SCU treatment significantly inhibited Hep3B cell proliferation and induced G2/M phase cell cycle arrest by inhibiting the expression level of the proteins Cdc25C, cdk1 and Cyclin B1. Allophycocyanin (APC)/Annexin V and propidium iodide (PI) double-staining showed upregulation of apoptotic cell death fraction. We further confirmed apoptosis by 4′-6-diamidino-2-phenylindole (DAPI) fluorescent staining and observed DNA fragmentation with agarose gel electrophoresis. Further, immunoblotting results showed that treatment with SCU showed no changes in Bax and Bcl-xL protein levels. In addition, SCU treatment did not affect the mitochondrial membrane potential (MMP) in Hep3B cells. On the contrary, treatment with SCU increased the expression of Fas and Fas ligand (FasL), which activated cleaved caspase-8, caspase-3, and polymeric adenosine diphosphate ribose (PARP), whereas the expression level of death receptor 4 (DR4) decreased. We confirmed that the proteins expressed upon treatment with SCU were involved in the Fas-mediated pathway of apoptosis in Hep3B cells. Thus, our findings in the current study strongly imply that SCU can be a basic natural source for developing potent anti-cancer agents for hepatocellular carcinoma (HCC) treatment.
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Affiliation(s)
- Ha Sang Eun
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea.
| | - Kim Seong Min
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea.
| | - Lee Ho Jeong
- Gyeongnam Department of Environment Toxicology and Chemistry, Biological Resources Research Group, Korea Institute of Toxicology, 17 Jegok-gil, Jinju 52834, Korea.
| | - Preethi Vetrivel
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea.
| | | | - Heo Jeong Doo
- Gyeongnam Department of Environment Toxicology and Chemistry, Biological Resources Research Group, Korea Institute of Toxicology, 17 Jegok-gil, Jinju 52834, Korea.
| | - Kim Eun Hee
- Department of Nursing Science, International University of Korea, Jinju 52833, Korea.
| | - Lee Sang Joon
- Gyeongnam Department of Environment Toxicology and Chemistry, Biological Resources Research Group, Korea Institute of Toxicology, 17 Jegok-gil, Jinju 52834, Korea.
| | - Kim Gon Sup
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea.
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Long L, Li Y, Yu S, Li X, Hu Y, Long T, Wang L, Li W, Ye X, Ke Z, Xiao H. Scutellarin Prevents Angiogenesis in Diabetic Retinopathy by Downregulating VEGF/ERK/FAK/Src Pathway Signaling. J Diabetes Res 2019; 2019:4875421. [PMID: 31976335 PMCID: PMC6949683 DOI: 10.1155/2019/4875421] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 10/24/2019] [Accepted: 10/30/2019] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Diabetic retinopathy (DR) is a serious microvascular complication of diabetes. This study demonstrates the antiangiogenic effects of scutellarin (SCU) on high glucose- and hypoxia-stimulated human retinal endothelial cells (HRECs) and on a diabetic rat model by oral administration. The antiangiogenic mechanisms of SCU in vitro and in vivo were investigated. METHOD HRECs were cultured in high glucose- (30 mM D-glucose) and hypoxia (cobalt chloride-treated)-stimulated diabetic condition to evaluate the antiangiogenic effects of SCU by CCK-8 test, cell migration experiment (wound healing and transwell), and tube formation experiment. A streptozotocin-induced type II diabetic rat model was established to measure the effects of oral administration of SCU on protecting retinal microvascular dysfunction by Doppler waveforms and HE staining. We further used western blot, luciferase reporter assay, and immunofluorescence staining to study the antiangiogenic mechanism of SCU. The protein levels of phospho-ERK, phospho-FAK, phospho-Src, VEGF, and PEDF were examined in HRECs and retina of diabetic rats. RESULT Our results indicated that SCU attenuated diabetes-induced HREC proliferation, migration, and tube formation and decreased neovascularization and resistive index in the retina of diabetic rats by oral administration. SCU suppressed the crosstalk of phospho-ERK, phospho-FAK, phospho-Src, and VEGF in vivo and in vitro. CONCLUSIONS These results suggested that SCU can be an oral drug to alleviate microvascular dysfunction of DR and exerts its antiangiogenic effects by inhibiting the expression of the crosstalk of VEGF, p-ERK, p-FAK, and p-Src.
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Affiliation(s)
- Lingli Long
- Department of Endocrinology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
- Translation Medicine Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Yubin Li
- The Reproductive Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Shuang Yu
- Department of Endocrinology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Xiang Li
- Department of Spine Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Yue Hu
- Translation Medicine Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Tengfei Long
- Department of Gynaecology and Obstetrics, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
| | - Liqin Wang
- Department of Radiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Wenwen Li
- Laboratory Animal Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Xiaoxin Ye
- University of New South Wales, Sydney, High St. Kensington, NSW, Australia
| | - Zunfu Ke
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Haipeng Xiao
- Department of Endocrinology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
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Wang L, Ma Q. Clinical benefits and pharmacology of scutellarin: A comprehensive review. Pharmacol Ther 2018; 190:105-127. [DOI: 10.1016/j.pharmthera.2018.05.006] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Wang Q, Liao XL, Xiang C, Yang J. A Practical Synthesis of the Flavone, Scutellarein. JOURNAL OF CHEMICAL RESEARCH 2017. [DOI: 10.3184/174751917x14873588907765] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A practical and economical five-step synthesis of the flavone scutellarein has been achieved in 60% overall yield using the available and cheap 2,6-dimethoxy-1,4-benzoquinone as starting material. The reaction sequence involved reduction to the corresponding quinol, Friedel-Crafts acetylation, Claisen-Schmidt condensation with p-methoxybenzaldehyde, cyclisation and demethylation. The procedure is operationally simple and amenable to scale-up synthesis.
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Affiliation(s)
- Qian Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan Province 650500, P.R. China
| | - Xia-li Liao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan Province 650500, P.R. China
| | - Cheng Xiang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan Province 650500, P.R. China
| | - Jian Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan Province 650500, P.R. China
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18
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Wang J, Tan J, Luo J, Huang P, Zhou W, Chen L, Long L, Zhang LM, Zhu B, Yang L, Deng DYB. Enhancement of scutellarin oral delivery efficacy by vitamin B12-modified amphiphilic chitosan derivatives to treat type II diabetes induced-retinopathy. J Nanobiotechnology 2017; 15:18. [PMID: 28249594 PMCID: PMC5333415 DOI: 10.1186/s12951-017-0251-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 02/10/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Diabetic retinopathy is the most common complication in diabetic patients relates to high expression of VEGF and microaneurysms. Scutellarin (Scu) turned out to be effective against diabetes related vascular endothelial cell dysfunction. However, its clinical applications have been limited by its low bioavailability. In this study, we formulated and characterized a novel intestinal target nanoparticle carrier based on amphiphilic chitosan derivatives (Chit-DC-VB12) loaded with scutellarin to enhance its bioavailability and then evaluated its therapeutic effect in experimental diabetic retinopathy model. RESULTS Chit-DC-VB12 nanoparticles showed low toxicity toward the human colon adenocarcinoma (Caco-2) cells and zebra fish within concentration of 250 μg/ml, owing to good biocompatibility of chitosan. The scutellarin-loaded Chit-DC-VB12 nanoparticles (Chit-DC-VB12-Scu) were then prepared by self-assembly in aqueous solution. Scanning electron microscopy and dynamic light scattering analysis indicated that the Chit-DC-VB12-Scu nanoparticles were spherical particles in the sizes ranging from 150 to 250 nm. The Chit-DC-VB12-Scu nanoparticles exhibited high permeation in Caco-2 cell, indicated it could be beneficial to be absorbed in humans. We also found that Chit-DC-VB12 nanoparticles had a high cellular uptake. Bioavailability studies were performed in Sprague-Dawley rats, which present the area under the curve of scutellarin of Chit-DC-VB12-Scu was two to threefolds greater than that of free scutellarin alone. Further to assess the therapeutic efficacy of diabetic retinopathy, we showed Chit-DC-VB12-Scu down-regulated central retinal artery resistivity index and the expression of angiogenesis proteins (VEGF, VEGFR2, and vWF) of retinas in type II diabetic rats. CONCLUSIONS Chit-DC-VB12 nanoparticles loaded with scutellarin have better bioavailability and cellular uptake efficiency than Scu, while Chit-DC-VB12-Scu nanoparticles alleviated the structural disorder of intraretinal neovessels in the retina induced by diabetes, and it also inhibited the retinal neovascularization via down-regulated the expression of angiogenesis proteins. In conclusion, the Chit-DC-VB12 nanoparticles enhanced scutellarin oral delivery efficacy and exhibited potential as small intestinal target promising nano-carriers for treatment of type II diabetes induced-retinopathy.
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Affiliation(s)
- Jingnan Wang
- Research Center of Translational Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China
| | - Jiayun Tan
- Department of Polymer and Material Science, School of Chemistry, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Provincial Key Laboratory for High Performance Polymer-based Composites, Sun Yat-sen University, Guangzhou, 510275, China
| | - Jiahao Luo
- Department of Polymer and Material Science, School of Chemistry, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Provincial Key Laboratory for High Performance Polymer-based Composites, Sun Yat-sen University, Guangzhou, 510275, China
| | - Peilin Huang
- Institute of Biomaterial, Department of Applied Chemistry, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Wuyi Zhou
- Institute of Biomaterial, Department of Applied Chemistry, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | | | - Lingli Long
- Research Center of Translational Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China
| | - Li-Ming Zhang
- Department of Polymer and Material Science, School of Chemistry, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Provincial Key Laboratory for High Performance Polymer-based Composites, Sun Yat-sen University, Guangzhou, 510275, China
| | - Banghao Zhu
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Liqun Yang
- Department of Polymer and Material Science, School of Chemistry, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Provincial Key Laboratory for High Performance Polymer-based Composites, Sun Yat-sen University, Guangzhou, 510275, China.
| | - David Y B Deng
- Research Center of Translational Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China. .,Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China.
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Abstract
AbstractThe endothelium, a thin single sheet of endothelial cells, is a metabolically active layer that coats the inner surface of blood vessels and acts as an interface between the circulating blood and the vessel wall. The endothelium through the secretion of vasodilators and vasoconstrictors serves as a critical mediator of vascular homeostasis. During the development of the vascular system, it regulates cellular adhesion and vessel wall inflammation in addition to maintaining vasculogenesis and angiogenesis. A shift in the functions of the endothelium towards vasoconstriction, proinflammatory and prothrombic states characterise improper functioning of these cells, leading to endothelial dysfunction (ED), implicated in the pathogenesis of many diseases including diabetes. Major mechanisms of ED include the down-regulation of endothelial nitric oxide synthase levels, differential expression of vascular endothelial growth factor, endoplasmic reticulum stress, inflammatory pathways and oxidative stress. ED tends to be the initial event in macrovascular complications such as coronary artery disease, peripheral arterial disease, stroke and microvascular complications such as nephropathy, neuropathy and retinopathy. Numerous strategies have been developed to protect endothelial cells against various stimuli, of which the role of polyphenolic compounds in modulating the differentially regulated pathways and thus maintaining vascular homeostasis has been proven to be beneficial. This review addresses the factors stimulating ED in diabetes and the molecular mechanisms of natural polyphenol antioxidants in maintaining vascular homeostasis.
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Wu JH, Wang YH, Wang W, Shen W, Sang YZ, Liu L, Chen CM. MiR-18b suppresses high-glucose-induced proliferation in HRECs by targeting IGF-1/IGF1R signaling pathways. Int J Biochem Cell Biol 2016; 73:41-52. [PMID: 26851511 DOI: 10.1016/j.biocel.2016.02.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Revised: 01/28/2016] [Accepted: 02/02/2016] [Indexed: 01/08/2023]
Abstract
MicroRNAs (miRNAs) are important for the proliferation of endothelial cells and have been shown to be involved in diabetic retinopathy (DR). In previous study, we found that miRNAs might play a critical role in hyperglycemia-induced endothelial cell proliferation based on miRNA expression profiling. Here, the roles of microRNA-18b (miR-18b) in the proliferation of human retinal endothelial cells (HRECs) were investigated in an in vitro model of HRECs grown in high glucose. We identified that levels of miR-18b were decreased in high-glucose-induced HRECs, compared with those in cells incubated in normal glucose. However, the reduction of miR-18b up-regulated vascular endothelial growth factor (VEGF) secretion and promoted effects on in vitro proliferation of HRECs. Mechanistically, insulin growth factor-1 (IGF-1) was identified as a target of miR-18b. IGF-1 simulation could antagonize the effect induced by miR-18b up-regulation, promoting cell proliferation and increasing VEGF production. In contrast, the opposite results were observed with silencing IGF-1, which was consistent with the effects of miR-18b overexpression. MiR-18b exerted its function on VEGF synthesis and cell proliferation by suppressing the IGF-1/insulin growth factor-1 receptor (IGF1R) pathway, consequently inhibiting the downstream phosphorylation of Akt, MEK, and ERK. Hence, this may provide a new insight into understanding the mechanism of DR pathogenesis, as well as a potential therapeutic target for proliferative DR.
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Affiliation(s)
- Jin-Hui Wu
- Departments of Ophthalmology at Changhai Hospital, Second Military Medical University, Shanghai, China.
| | - Yi-Han Wang
- Departments of Ophthalmology at Renji Hospital, Shanghai, China
| | - Wei Wang
- Department of Ophthalmology & Visual Sciences, University of Louisville, Louisville, KY, USA
| | - Wei Shen
- Departments of Ophthalmology at Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Yan-Zhi Sang
- Departments of Ophthalmology at Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Lin Liu
- Departments of Ophthalmology at Renji Hospital, Shanghai, China
| | - Cui-Min Chen
- Departments of Central Sterile Supply at Changhai Hospital, Second Military Medical University, Shanghai, China.
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Tian X, Chang L, Ma G, Wang T, Lv M, Wang Z, Chen L, Wang Y, Gao X, Zhu Y. Delineation of Platelet Activation Pathway of Scutellarein Revealed Its Intracellular Target as Protein Kinase C. Biol Pharm Bull 2015; 39:181-91. [PMID: 26581323 DOI: 10.1248/bpb.b15-00511] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Erigeron breviscapus has been widely used in traditional Chinese medicine (TCM) and its total flavonoid component is commonly used to treat ischemic stroke, coronary heart disease, diabetes and hypertension. Scutellarin is the major ingredient of E. breviscapus and scutellarein is one of the main bioactive metabolites of scutellarin in vivo, but the latter's pharmacological activities have not been fully characterized. Provided evidence that could inhibit platelet aggregation, the effect of scutellarein on rat washed platelets and its underlying mechanisms were evaluated in our research. Scutellarein inhibited platelet adhesion and aggregation induced by multiple G protein coupled receptor agonists such as thrombin, U46619 and ADP, in a concentration-dependent manner. Furthermore, the mild effect of scutellarein on intracellular Ca(2+) mobilization and cyclic AMP (cAMP) level was observed. On the other hand, the role of scutellarein as potential protein kinase C (PKC) inhibitor was confirmed by PKC activity analysis and molecular docking. The phorbol myristate acetate-induced platelets aggregation assay with or without ADP implied that the scutellarein takes PKC(s) as its primary target(s), and acts on it in a reversible way. Finally, scutellarein as a promising agent exhibited a high inhibition effect on ADP-induced platelet aggregation among its analogues. This study clarifies the PKC-related signaling pathway involved in antiplatelet action of scutellarein, and may be beneficial for the treatment of cardiovascular diseases.
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Affiliation(s)
- Xiaoxuan Tian
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine
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Scutellarin inhibits high glucose-induced and hypoxia-mimetic agent-induced angiogenic effects in human retinal endothelial cells through reactive oxygen species/hypoxia-inducible factor-1α/vascular endothelial growth factor pathway. J Cardiovasc Pharmacol 2015; 64:218-27. [PMID: 25192544 DOI: 10.1097/fjc.0000000000000109] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Scutellarin inhibits hypoxia-induced and moderately high glucose-induced proliferation and vascular endothelial growth factor (VEGF) expression in human retinal endothelial cells (HRECs); thus, it could be a potential therapy for diabetic retinopathy. However, how scutellarin inhibits VEGF is unknown. In our study, HRECs were treated with high glucose and/or hypoxia-mimetic agent cobalt chloride to stimulate cell proliferation, migration, and angiogenesis, and the effects of scutellarin on these processes were analyzed through cell viability assay, Transwell migration assay and endothelial tube formation assay, respectively. The inhibition of angiogenic factor VEGF by scutellarin was confirmed by reverse transcription polymerase chain reaction and enzyme-linked immunosorbent assay. The mechanisms for VEGF inhibition were examined by luciferase reporter assay, Western blot, immunoprecipitation, and biochemical assays. We found that scutellarin not only concentration-dependently inhibited cell proliferation, migration, and tube formation in HRECs but also decreased their production of VEGF. The reduction of VEGF was due to increased ubiquitination and degradation of hypoxia-inducible factor (HIF)-1α by scutellarin. Furthermore, scutellarin impaired the interaction of HIF-1α with p300, which further decreased the transcriptional activity of HIF-1α. As an inducer of HIF-1α, oxidative stress was attenuated by scutellarin. Our data demonstrate that scutellarin exhibits an antiangiogenic effect via inhibition of oxidative stress, enhancement of HIF-1α degradation, and reduction of VEGF secretion.
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Shi X, Chen G, Liu X, Qiu Y, Yang S, Zhang Y, Fang X, Zhang C, Liu X. Scutellarein inhibits cancer cell metastasis in vitro and attenuates the development of fibrosarcoma in vivo. Int J Mol Med 2014; 35:31-8. [PMID: 25394920 PMCID: PMC4249742 DOI: 10.3892/ijmm.2014.1997] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Accepted: 10/02/2014] [Indexed: 12/28/2022] Open
Abstract
Fibrosarcoma is an aggressive and highly metastatic cancer of the connective tissue, for which effective therapeutic methods are limited. Recently, there has been a renewed interest in small molecular compounds from natural products in the treatment of cancer. In the present study, we investigated the compound, scutellarein, extracted from the perennial herb Scutellaria lateriflora, and it was found to possess anticancer potential. Cell proliferation assay and cell cycle analysis revealed that the proliferation rate of HT1080 human fibrosarcoma cells was significantly suppressed by treatment with scutellarein through the induction of apoptosis. Moreover, an in vivo experiment using Balb/c nude mice revealed that the volume and weight of the tumors were markedly reduced following treatment with scutellarein. We also analyzed the effects of scutellarein on the markers of metastasis, using the HT1080 cells. The results indicated that scutellarein potently inhibited cell migration, invasion and the expression and activity of matrix metalloproteinase (MMP)-2, -9 and -14. Furthermore, MMP activation and cell survival were suppressed due to the scutellarein-mediated downregulation of nuclear factor κ-light-chain-enhancer of activated B cells (NF-κB) activation. In conclusion, our data suggest that scutellarein has the ability to attenuate the development of fibrosarcoma and inhibit cancer cell metastasis.
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Affiliation(s)
- Xiujuan Shi
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Guangfeng Chen
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Xiaoqiang Liu
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Yu Qiu
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Shuzhang Yang
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Yan Zhang
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Xuexun Fang
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, Jilin University, Changchun, Jilin 130023, P.R. China
| | - Chen Zhang
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Xiaoqing Liu
- Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
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Liu ZC, Yu EH, Liu W, Liu XC, Tang SB, Zhu BH. Translocation of protein kinase C δ contributes to the moderately high glucose-, but not hypoxia-induced proliferation in primary cultured human retinal endothelial cells. Mol Med Rep 2014; 9:1780-6. [PMID: 24626810 DOI: 10.3892/mmr.2014.2049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 02/10/2014] [Indexed: 11/05/2022] Open
Abstract
Diabetic retinopathy is one of the most common complications in patients with diabetes and affects ~75% of them within 15 years of the onset of the disease. Activation of protein kinase C (PKC) is a key feature of diabetes mellitus and may be involved in the pathogenesis of diabetic retinopathy. The present study aimed to examine the translocation of protein kinase C (PKC) isoforms, which are triggered by high an moderately high glucose levels as well as hypoxic conditions. The underlying cell mechanisms of PKC translocation in primary cultured human retinal endothelial cells (HRECs) were also investigated. The expression levels of PKC isoforms were assessed using western blot analysis. Cell proliferation was determined using the MTT assay and DNA synthesis was assessed by bromodeoxyuridine incorporation. Translocation of PKC isoforms was examined by western blot analysis and immunofluorescence. The expression of PKC α, βI, βII, δ and ε was detected, while PKC ζ was not detected in HRECs. The results of the present study were consistent with the findings of a previous study by our group, reporting that moderately high glucose levels and hypoxia, but not high glucose levels, significantly increased cell proliferation. It was demonstrated that the PKC δ isoform was translocated from the cytosol to the membrane only under moderately high glucose conditions, while PKC α and ε isoforms were translocated from the cytosol to the membrane at high glucose conditions. In addition, PKC βI was translocated under all three conditions. Translocation of PKC βII was comparable among all groups. Furthermore, rottlerin, an inhibitor of PKC δ, blocked cell proliferation, which was induced by moderately high glucose levels, but not by hypoxia. Ro32-0432, an inhibitor of PKC α, βI and ε, did not significantly affect proliferation of HRECs in all treatment groups. In conclusion, the present study suggested that PKC α, βI, βII, δ and ε were expressed in primary cultured HRECs, whereas PKC ζ was not. Cell proliferation induced by moderately high glucose concentrations was associated with translocation of the PKC δ isoform; however, hypoxic conditions did not induce translocation.
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Affiliation(s)
- Zhao-Chun Liu
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
| | - En-Hong Yu
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Wei Liu
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Xiao-Chang Liu
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Shi-Bo Tang
- Zhongshan Ophthalmic Center, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Bang-Hao Zhu
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
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Su Y, Liu W, Ma L, Liu X, Liu Z, Zhu B. Scutellarin inhibits translocation of protein kinase C in diabetic thoracic aorta of the rat. Clin Exp Pharmacol Physiol 2012; 39:136-40. [PMID: 22092277 DOI: 10.1111/j.1440-1681.2011.05645.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aims of the present study were to explore the effects of: (i) scutellarin (Scu) on protein kinase C (PKC) translocation caused by diabetic conditions in diabetic rat thoracic aorta; and (ii) phorbol-12-myristate-13-acetate (PMA) treatment of cultured thoracic aortic smooth muscle cells. Diabetes was induced in rats by streptozotocin and diabetic rats were divided into two groups: (i) an Scu-treated group, administered 0.1 g/kg Scu by gavage; and (ii) an aminoquanidine (AG)-treated group, which received dietary supplementation of 0.1% AG from Week 1 of diabetes induction. After 10 weeks, rats were killed and thoracic aortic smooth muscle cells were isolated and cultured. Cell fractions were obtained by ultracentrifugation and PKC activity was assayed by ELISA, whereas the distribution of PKC was verified by western immunoblotting. The PKC activity in the membrane fraction of thoracic aortic smooth muscle cells was significantly increased in diabetic compared with control rats, whereas the administration of Scu significantly inhibited this increase. Phorbol myristate acetate (100 nmol/L, 10 min) induced the translocation of the PKCα, βI, βII, δ and ε isoforms, whereas 48 h pretreatment of cells with 1 μmol/L Scu significantly inhibited PMA-induced PKCβI, βII and δ translocation. The results of the present study suggest that Scu inhibits the translocation of PKC in vivo and in vitro and may have value as a drug in the treatment of diabetic complications via its inhibition of PKC βI, βII and δ translocation.
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Affiliation(s)
- Yingxue Su
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
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Xiong F, Wang H, Chen YJ, Geng KK, Gu N, Zhu JB. Characterization, biodistribution and targeting evaluation of breviscapine lipid emulsions following intravenous injection in mice. Drug Deliv 2010; 18:159-65. [DOI: 10.3109/10717544.2010.528068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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ERK5 Contributes to VEGF Alteration in Diabetic Retinopathy. J Ophthalmol 2010; 2010:465824. [PMID: 20671964 PMCID: PMC2910485 DOI: 10.1155/2010/465824] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Revised: 04/15/2010] [Accepted: 05/19/2010] [Indexed: 01/01/2023] Open
Abstract
Diabetic retinopathy is one of the most common causes of blindness in North America. Several signaling mechanisms are activated secondary to hyperglycemia in diabetes, leading to activation of vasoactive factors. We investigated a novel pathway, namely extracellular signal regulated kinase 5 (ERK5) mediated signaling, in modulating glucose-induced vascular endothelial growth factor (VEGF) expression.
Human microvascular endothelial cells (HMVEC) were exposed to glucose. In parallel, retinal tissues from streptozotocin-induced diabetic rats were examined after 4 months of follow-up. In HMVECs, glucose caused initial activation followed by deactivation of ERK5 and its downstream mediators myocyte enhancing factor 2C (MEF2C) and Kruppel-like factor 2 (KLF2) mRNA expression. ERK5 inactivation further led to augmented VEGF mRNA expression. Furthermore, siRNA mediated ERK5 gene knockdown suppressed MEF2C and KLF2 expression and increased VEGF expression and angiogenesis. On the other hand, constitutively active MEK5, an activator of ERK5, increased ERK5 activation and ERK5 and KLF2 mRNA expression and attenuated basal- and glucose-induced VEGF mRNA expression. In the retina of diabetic rats, depletion of ERK5, KLF2 and upregulation of VEGF mRNA were demonstrated.
These results indicated that ERK5 depletion contributes to glucose induced increased VEGF production and angiogenesis. Hence, ERK5 may be a putative therapeutic target to modulate VEGF expression in diabetic retinopathy.
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CYP1-mediated antiproliferative activity of dietary flavonoids in MDA-MB-468 breast cancer cells. Toxicology 2009; 264:162-70. [PMID: 19666078 DOI: 10.1016/j.tox.2009.07.023] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 07/24/2009] [Accepted: 07/27/2009] [Indexed: 11/20/2022]
Abstract
Among the different mechanisms proposed to explain the cancer-protecting effect of dietary flavonoids, substrate-like interactions with cytochrome P450 CYP1 enzymes have recently been explored. In the present study, the metabolism of the flavonoids chrysin, baicalein, scutellarein, sinensetin and genkwanin by recombinant CYP1A1, CYP1B1 and CYP1A2 enzymes, as well as their antiproliferative activity in MDA-MB-468 human breast adenocarcinoma and MCF-10A normal breast cell lines, were investigated. Baicalein and 6-hydroxyluteolin were the only conversion products of chrysin and scutellarein metabolism by CYP1 family enzymes, respectively, while baicalein itself was not metabolized further. Sinensetin and genkwanin produced a greater number of metabolites and were shown to inhibit strongly in vitro proliferation of MDA-MB-468 cells at submicromolar and micromolar concentrations, respectively, without essentially affecting the viability of MCF-10A cells. Cotreatment of the CYP1 family inhibitor acacetin reversed the antiproliferative activity noticed for the two flavones in MDA-MB-468 cells to 13 and 14 microM respectively. In contrast chrysin, baicalein and scutellarein inhibited proliferation of MDA-MB-468 cells to a lesser extent than sinensetin and genkwanin. The metabolism of genkwanin to apigenin and of chrysin to baicalein was favored by CYP1B1 and CYP1A1, respectively. Taken together the data suggests that CYP1 family enzymes enhance the antiproliferative activity of dietary flavonoids in breast cancer cells, through bioconversion to more active products.
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