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Samson F, He W, Sripathi SR, Patrick AT, Madu J, Chung H, Frost MC, Jee D, Gutsaeva DR, Jahng WJ. Dual Switch Mechanism of Erythropoietin as an Antiapoptotic and Pro-Angiogenic Determinant in the Retina. ACS OMEGA 2020; 5:21113-21126. [PMID: 32875248 PMCID: PMC7450639 DOI: 10.1021/acsomega.0c02763] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 07/28/2020] [Indexed: 05/07/2023]
Abstract
Constant or intense light degenerates the retina and retinal pigment epithelial cells. Light generates reactive oxygen species and nitric oxide leading to initial reactions of retinal degeneration. Apoptosis is the primary mechanism of abnormal death of photoreceptors, retinal ganglion cells, or retinal pigment epithelium (RPE) in degenerative retinal diseases, including diabetic retinopathy and age-related macular degeneration. The current study evaluated the function of erythropoietin (EPO) on angiogenesis and apoptosis in the retina and RPE under oxidative stress. We determined the pro-angiogenic and antiapoptotic mechanism of EPO under stress conditions using a conditional EPO knockdown model using siRNA, EPO addition, proteomics, immunocytochemistry, and bioinformatic analysis. Our studies verified that EPO protected retinal cells from light-, hypoxia-, hyperoxia-, and hydrogen peroxide-induced apoptosis through caspase inhibition, whereas up-regulated angiogenic reactions through vascular endothelial growth factor (VEGF) and angiotensin pathway. We demonstrated that the EPO expression in the retina and subsequent serine/threonine/tyrosine kinase phosphorylations might be linked to oxidative stress response tightly to determining angiogenesis and apoptosis. Neuroprotective roles of EPO may involve the balance between antiapoptotic and pro-angiogenic signaling molecules, including BCL-xL, c-FOS, caspase-3, nitric oxide, angiotensin, and VEGF receptor. Our data indicate a new therapeutic application of EPO toward retinal degeneration based on the dual roles in apoptosis and angiogenesis at the molecular level under oxidative stress.
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Affiliation(s)
| | - Weilue He
- Department
of Biomedical Engineering, Michigan Technological
University, Houghton 49931, United States
| | - Srinivas R. Sripathi
- Department
of Ophthalmology, Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, United States
| | - Ambrose Teru Patrick
- Department
of Petroleum Chemistry, American University
of Nigeria, Yola 640101, Nigeria
| | - Joshua Madu
- Department
of Petroleum Chemistry, American University
of Nigeria, Yola 640101, Nigeria
| | - Hyewon Chung
- Department
of Ophthalmology, School of Medicine, Konkuk
University, Seoul 05030, Korea
| | - Megan C. Frost
- Department
of Biomedical Engineering, Michigan Technological
University, Houghton 49931, United States
| | - Donghyun Jee
- Division
of Vitreous and Retina, Department of Ophthalmology, St. Vincent’s
Hospital, College of Medicine, The Catholic
University of Korea, Suwon 16247, Korea
| | - Diana R. Gutsaeva
- Department
of Ophthalmology, Augusta University, Augusta, Georgia 30912, United States
| | - Wan Jin Jahng
- Department
of Petroleum Chemistry, American University
of Nigeria, Yola 640101, Nigeria
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Fontana J, Kučera O, Mezera V, Anděl M, Červinková Z. Glucagon-like peptide-1 analogues exenatide and liraglutide exert inhibitory effect on the early phase of liver regeneration after partial hepatectomy in rats. Physiol Res 2017; 66:833-844. [PMID: 28730824 DOI: 10.33549/physiolres.933464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Glucagon-like peptide-1 (GLP-1) is an incretin known for proliferative and antiapoptotic effects on various tissues. Exenatide and Liraglutide are GLP-1 analogues used in clinical practice as antidiabetic drugs. Since GLP-1 and its analogues exert significant effect on liver metabolism and since changes in intermediary metabolism play an important role in the process of liver regeneration, we decided to determine the effect of Exenatide and Liraglutide on the early phase of liver regeneration and selected metabolic parameters in a model of 2/3 partial hepatectomy (PHx) in rats. Animals were submitted either to PHx or laparotomy and received 3 doses of either GLP-1 analogues (Exenatide - 42 microg/kg b.w., Liraglutide - 0.75 mg/kg b.w.) or saline intraperitoneally. We analyzed body and liver weight, liver bromodeoxyuridine incorporation, liver content of DNA, triacylglycerols and cholesterol and biochemical serum parameters. Bromodeoxyuridine labeling was significantly lower in hepatectomized rats receiving either type of GLP-1 analogues when compared to hepatectomized controls. This effect was more pronounced in the Liraglutide group compared to Exenatide (p<0.001). In addition, liver DNA content was lower in hepatectomized rats receiving Liraglutide than in hepatectomized control rats (p<0.001). In conclusion, GLP-1 analogues Exenatide and Liraglutide significantly inhibited an early phase of liver regeneration after PHx in rats. This inhibitory effect was more pronounced in rats receiving Liraglutide.
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Affiliation(s)
- J Fontana
- Centre for Research on Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic.
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Tsompos C, Panoulis C, Toutouzas K, Zografos G, Papalois A. THE ACUTE EFFECT OF ERYTHROPOIETIN ON GLUCOSE LEVELS DURING ISCHEMIA REPERFUSION INJURY IN RATS. FOLIA MEDICA INDONESIANA 2017. [DOI: 10.20473/fmi.v52i1.5199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this experimental study was to examine the effect of erythropoietin on rat model and particularly in an ischemia reperfusion (HR) protocol. The effect of that molecule was studied biochemically using blood mean glucose (Gl) levels. Materials and methods: 40 rats of mean weight 247.7 g were used in the study. Gl levels were measured at 60 min (groups A and C) and at 120 min (groups B and D) of reperfusion. Erythropoietin was administered only in groups C and D. Results were that Epo administration non-significantly increased the gl levels by 5.59% +6.46% (p=0.3208). Reperfusion time non-significantly increased the gl levels by 5.63%+6.45% (p=0.4098). However, erythropoietin administration and reperfusion time together produced a non significant combined effect in increasing the gl levels by 4.94%+3.81% (p= 0.1892). Conclusions: Results of this study indicate that erythropoietin administration, reperfusion time, or their interaction non-significantly increase the blood glucose levels in short-term. Opposite bibliographic data are considered more reliable, until a greater sample provide clearer results.
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Tsompos C, Panoulis C, Toutouzas K, Zografos G, Papalois A. The effect of erythropoietin on endometrial edema during ischemia–reperfusion injury in rats. J Histotechnol 2016. [DOI: 10.1080/01478885.2016.1202406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Garnol T, Kučera O, Staňková P, Lotková H, Červinková Z. Does Simple Steatosis Affect Liver Regeneration after Partial Hepatectomy in Rats? ACTA MEDICA (HRADEC KRÁLOVÉ) 2016; 59:35-42. [DOI: 10.14712/18059694.2016.87] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Aim: The aim of our study was to assess whether simple steatosis impairs liver regeneration after partial hepatectomy (PHx) in rats. Methods: Male Sprague–Dawley rats were fed a standard diet (ST-1, 10% kcal fat) and high-fat diet (HFD, 71% kcal fat) for 6 weeks. Then the rats were submitted to 2/3 PHx and animals were sacrificed 24, 48 or 72 h after PHx. Serum biochemistry, respiration of mitochondria in liver homogenate, hepatic oxidative stress markers, selected cytokines and DNA content were measured, and histopathological samples were prepared. Liver regeneration was evaluated by incorporation of bromodeoxyuridine (BrdU) to hepatocyte DNA. Results: HFD induced simple microvesicular liver steatosis. PHx caused elevation of serum markers of liver injury in both groups; however, an increase in these parameters was delayed in HFD group. Hepatic content of reduced glutathione was significantly increased in both groups after PHx. There were no significant changes in activities of respiratory complexes I and II (state 3). Relative and absolute liver weights, total DNA content, and DNA synthesis exerted very similar changes in both ST-1 and HFD groups after PHx. Conclusion: PHx-induced regeneration of the rat liver with simple steatosis was not significantly affected when compared to the lean liver.
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Giri S, Acikgöz A, Bader A. Isolation and Expansion of Hepatic Stem-like Cells from a Healthy Rat Liver and their Efficient Hepatic Differentiation of under Well-defined Vivo Hepatic like Microenvironment in a Multiwell Bioreactor. J Clin Exp Hepatol 2015; 5:107-22. [PMID: 26155038 PMCID: PMC4491607 DOI: 10.1016/j.jceh.2015.03.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/20/2015] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Currently, undifferentiated cells are found in all tissue and term as local stem cells which are quiescent in nature and less in number under normal healthy conditions but activate upon injury and repair the tissue or organs via automated activating mechanism. Due to very scanty presence of local resident somatic local stem cells in healthy organs, isolation and expansion of these adult stems is an immense challenge for medical research and cell based therapy. Particularly organ like liver, there is an ongoing controversy about existence of liver stem cells. METHODS Herein, Hepatic stem cells population was identified during culture of primary hepatocyte cells upon immediate isolation of primary hepatocyte cells. These liver stem cells has been expanded extensively and differentiated into primary hepatocytes under defined culture conditions in a nanostructured self assembling peptides modular bioreactor that mimic the state of art of liver microenvironment and compared with Matrigel as a positive control. Nanostructured self assembling peptides were used a defined extracellular matrix and Matrigel was used for undefined extracellular matrix. Proliferation of hepatic stem cells was investigated by two strategies. First strategy is to provide high concentration of hepatocyte growth factor (HGF) and second strategy is to evaluate the role of recombinant human erythropoietin (rHuEPO) in presence of trauma/ischemia cytokines (IL-6, TNF-α). Expansion to hepatic differentiation is observed by morphological analysis and was evaluated for the expression of hepatocyte-specific genes using RT-PCR and biochemical methods. RESULTS Hepatocyte-specific genes are well expressed at final stage (day 21) of differentiation period. The differentiated hepatocytes exhibited functional hepatic characteristics such as albumin secretion, urea secretion and cytochrome P450 expression. Additionally, immunofluorescence analysis revealed that hepatic stem cells derived hepatocytes exhibited mature hepatocyte markers (albumin, CK-19, CPY3A1, alpha 1-antitrypsin). Expansion and hepatic differentiation was efficiently in nanostructured self assembling peptides without such batch to batch variation while there was much variation in Matrigel coated bioreactor. In conclusion, the results of the study suggest that the nanostructured self assembling peptides coated bioreactor supports expansion as well as hepatic differentiation of liver stem cells which is superior than Matrigel. CONCLUSION This defined microenvironment conditions in bioreactor module can be useful for research involving bioartificial liver system, stem cell research and engineered liver tissue which could contribute to regenerative cell therapies or drug discovery and development.
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Key Words
- A1AT, Alpha 1-antitrypsin
- AFP, α-fetoprotein
- CK 7, Cytokeratin 7
- CK-19, Cytokeratin 19
- CPY3A1, Cytochrome P450 3A 1
- EROD, Ethoxyresorufin O-deethylase
- GaIN, D-galactosamine
- HGF, Hepatocyte growth factor
- IL-6, Interleukin 6
- MROD, Methoxyresorufin O-demethylase
- Matrigel
- PROD, Pentoxyresorufin O-depentylase
- TNF-α, Tumor necrosis factor alpha
- Thy1, Thy-1 cell surface antigen
- bioreactor
- defined culture conditions
- hepatic stem cells
- nanostructured self assembling peptides
- rHuEPO, Recombinant human erythropoietin
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Affiliation(s)
- Shibashish Giri
- Department of Cell Techniques and Applied Stem Cell Biology, Center for Biotechnology and Biomedicine (BBZ), University of Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany,Address for correspondence: Shibashish Giri, Department of Cell Techniques and Applied Stem Cell Biology, Center for Biotechnology and Biomedicine, Medical faculty, University of Leipzig, Deutscher Platz 5, D-04103 Leipzig, Germany.
| | - Ali Acikgöz
- Department of Cell Techniques and Applied Stem Cell Biology, Center for Biotechnology and Biomedicine (BBZ), University of Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany,Department of Gastroenterology and Hepatology, Klinikum St Georg, Delitzscher Straße, Leipzig, Germany
| | - Augustinus Bader
- Department of Cell Techniques and Applied Stem Cell Biology, Center for Biotechnology and Biomedicine (BBZ), University of Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany
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Salles MB, Gehrke SA, Koo S, Allegrini S, Rogero SO, Ikeda TI, Cruz ÁS, Shinohara EH, Yoshimoto M. An alternative to nerve repair using an antioxidant compound: a histological study in rats. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:5340. [PMID: 25578694 DOI: 10.1007/s10856-014-5340-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 07/31/2014] [Indexed: 06/04/2023]
Abstract
The fascicular composition and organisation of the inferior alveolar nerve (IAN) were determined to confirm the microarchitecture of the IAN bundles into each of the mandibular teeth, including the composition of the mental nerve. The aim of this study was to evaluate peripheral nerve repair after the application of an antioxidant compound to the damaged nerve tissue to elevate the concentration and bioavailability of elements capable of favouring tissue repair. Twenty-five Wistar rats were divided into groups: The Control 1 (Ctl 1) (n = 5) animals had the ischiatic nerve exposed with no suture injury and were sacrificed at 30 days post-operatively. The Control 2 (Ctl 2) (n = 10) animals had the ischiatic nerve exposed, and the nerve was injured using suture in three distinct regions. In the experimental (Exp) animals (n = 10), an antioxidant organic compound was applied to the nerve injury site. The animals with nerve injury (Ctl2 and Exp group) were sacrificed at 15 and 30 days post-operatively. The histological analysis showed less degeneration in the Exp group at 15 and 30 days post-operatively. Nerve neoformation forming a connection between the distal and proximal suture sites was observed in the experimental group. This study presented an alternative to nerve repair using an antioxidant compound.
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Affiliation(s)
- Marcos B Salles
- Department of Health Sciences - School of Dentistry, 9 de Julho University, São Paulo, SP, Brazil
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Zhang J, Yang Y, He T, Liu Y, Zhou Y, Chen Y, Xu C. Expression profiles uncover the relationship between erythropoietin and cell proliferation in rat hepatocytes after a partial hepatectomy. Cell Mol Biol Lett 2014; 19:331-46. [PMID: 24928528 PMCID: PMC6275805 DOI: 10.2478/s11658-014-0198-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 05/28/2014] [Indexed: 02/06/2023] Open
Abstract
Erythropoietin (EPO) has a beneficial effect on hepatic cell proliferation during liver regeneration. However, the underlying mechanism has not yet been elucidated. To uncover the proliferation response of EPO in rat liver regeneration after partial hepatectomy (PH) at the cellular level, hepatocytes (HCs) were isolated using Percoll density gradient centrifugation. The genes of the EPO-mediated signaling pathway and the target genes of the transcription factor (TF) in the pathway were identified in a pathway and TF database search. Their expression profiles were then detected using Rat Genome 230 2.0 Microarray. The results indicated that the EPO-mediated signaling pathway is involved in 19 paths and that 124 genes participate, of which 32 showed significant changes and could be identified as liver regeneration-related genes. In addition, 443 targets regulated by the TFs of the pathway and 60 genes associated with cell proliferation were contained in the array. Subsequently, the synergetic effect of these genes in liver regeneration was analyzed using the E(t) mathematical model based on their expression profiles. The results demonstrated that the E(t) values of paths 3, 8, 12 and 14-17 were significantly strengthened in the progressing phase of liver regeneration through the RAS/MEK/ERK or PI3K/AκT pathways. The synergetic effect of the target genes, in parallel with target-related cell proliferation, was also enhanced 12-72 h after PH, suggesting a potential positive effect of EPO on HC proliferation during rat liver regeneration. These data imply that the EPO receptor may allow EPO to promote HC proliferation through paths 3, 8, 12 and 14-17, mediating the RAS/MEK/ERK and PI3K/AκT pathways in rat liver regeneration after PH.
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Affiliation(s)
- Jihong Zhang
- College of Life Science, Henan Normal University, Xinxiang, 453007 P.R. China
| | - Yajuan Yang
- College of Life Science, Henan Normal University, Xinxiang, 453007 P.R. China
| | - Tingting He
- College of Life Science, Henan Normal University, Xinxiang, 453007 P.R. China
| | - Yunqing Liu
- College of Life Science, Henan Normal University, Xinxiang, 453007 P.R. China
| | - Yun Zhou
- College of Life Science, Henan Normal University, Xinxiang, 453007 P.R. China
| | - Yongkang Chen
- College of Life Science and Technology, Jinan University, Guangzhou, 510632 P.R. China
| | - Cunshuan Xu
- College of Life Science, Henan Normal University, Xinxiang, 453007 P.R. China
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, 453007 P.R. China
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Peng HS, Xu XH, Zhang R, He XY, Wang XX, Wang WH, Xu TY, Xiao XR. Multiple low doses of erythropoietin delay the proliferation of hepatocytes but promote liver function in a rat model of subtotal hepatectomy. Surg Today 2014; 44:1109-15. [PMID: 24691936 DOI: 10.1007/s00595-014-0889-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Accepted: 03/04/2013] [Indexed: 02/08/2023]
Abstract
PURPOSE The impact of various doses of erythropoietin (EPO) on liver regeneration after partial hepatectomy (PH) in different animal models is still under debate. We investigated the impact of low doses of EPO on liver regeneration in a rat model of subtotal hepatectomy. METHODS We established a 90 % PH rat model with perioperative injections of low-dose EPO (1,000 IU/kg). We analyzed survival and hepatocyte proliferation in animals treated with or without EPO and assessed liver function by blood ammonia measurement and the indocyanine green 15-min retention test. RESULTS Low doses of EPO treatment improved the survival of rats after 90 % PH. Unexpectedly, during the first 24 h after the operation, liver regeneration in the EPO-treated rats was inhibited. DNA synthesis, cell proliferation, and the expression of cyclins and p-STAT3 peaked 48 h after PH, which was delayed by about 24 h vs. the control rats. Furthermore, EPO treatment increased the serum level of IL-6 and protected the hepatocytes from apoptosis. CONCLUSION Low doses of EPO do not stimulate early hepatocyte proliferation in the regenerating liver, but contribute to liver protection by inducing IL-6 and inhibiting apoptosis.
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Affiliation(s)
- Hua-sheng Peng
- Department of Geriatrics, Chengdu Military General Hospital, Chengdu, 610083, China
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10
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Mezera V, Kučera O, Moravcová A, Peterová E, Červinková Z. Epigallocatechin gallate does not accelerate the early phase of liver regeneration after partial hepatectomy in rats. Dig Dis Sci 2014; 59:976-85. [PMID: 24318805 PMCID: PMC3991829 DOI: 10.1007/s10620-013-2966-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 11/15/2013] [Indexed: 12/25/2022]
Abstract
BACKGROUND Two-thirds partial hepatectomy (PHx) is an established model for the study of liver regeneration after resection. This process is accompanied by oxidative stress. AIMS In our study, we tested the effect of epigallocatechin gallate (EGCG), a green tea antioxidant, on the early phase of liver regeneration after PHx. METHODS Male Wistar rats were divided into five groups: (I) laparotomy + water for intraperitoneal injections, (II) laparotomy + EGCG 50 mg/kg body weight, (III) PHx + water for injections, (IV) PHx + EGCG 20 mg/kg and (V) PHx + EGCG 50 mg/kg, for 3 consecutive days. The rats were killed 24 h after surgery. Biochemical analysis of rat sera was performed. Histological samples were stained with hematoxylin & eosin and bromodeoxyuridine (BrdU). In hepatectomized rats, we also measured plasma malondialdehyde, tissue malondialdehyde, glutathione and cytokines levels, the activity of caspases 3/7, expression of Nqo-1 and HO-1 genes at the mRNA level, and expression of p21, p-p27 and p-p53 genes at the protein level. RESULTS We observed lower accumulation of BrdU in group V when compared to groups III and IV. The activity of caspases 3/7 and expression of p-p53 were lower in group V than in groups III and IV. Tissue levels of IL-6 were lower in group V when compared to group III. Significant differences were not noted in other parameters. CONCLUSIONS Administration of EGCG did not stimulate early phase liver regeneration in rats after PHx. There was even lower DNA synthesis in the group treated with a high dose of EGCG.
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Affiliation(s)
- Vojtěch Mezera
- Department of Physiology, Faculty of Medicine in Hradec Kralove, Charles University in Prague, Simkova 870, 500 38 Hradec Kralove 1, Czech Republic
| | - Otto Kučera
- Department of Physiology, Faculty of Medicine in Hradec Kralove, Charles University in Prague, Simkova 870, 500 38 Hradec Kralove 1, Czech Republic
| | - Alena Moravcová
- Department of Physiology, Faculty of Medicine in Hradec Kralove, Charles University in Prague, Simkova 870, 500 38 Hradec Kralove 1, Czech Republic
| | - Eva Peterová
- Department of Biochemistry, Faculty of Medicine in Hradec Kralove, Charles University in Prague, Hradec Kralove 1, Czech Republic
| | - Zuzana Červinková
- Department of Physiology, Faculty of Medicine in Hradec Kralove, Charles University in Prague, Simkova 870, 500 38 Hradec Kralove 1, Czech Republic
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Darbepoetin inhibits proliferation of hepatic cancer cells in the presence of TGF-β. Arch Toxicol 2013; 88:89-96. [PMID: 23877120 DOI: 10.1007/s00204-013-1094-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 07/11/2013] [Indexed: 12/11/2022]
Abstract
Darbepoetin (DPO), an erythropoietin (EPO) derivative, was licensed in 2002 to treat patients with solid tumors suffering from chemotherapy-dependent anemia, although various tumors express EPO to improve vascularization, thus favoring tumor growth and spreading. Therefore, we wanted to investigate direct effects of DPO on the liver tumor cell lines HepG2, SkHep1, Huh-7, AKN1, HCC-T and HCC-M, as well as on primary human hepatocytes (hHeps). DPO (0-40 ng/ml) did not affect viability of hHeps, HepG2, SkHep1, AKN1, HCC-T and HCC-M cells, as determined by Resazurin conversion. However, Huh-7 cells' viability dose-dependently decreased from 5 ng/ml DPO on. Lack of LDH release into culture medium and negative DNA laddering excluded apoptosis or necrosis as the cause for the reduced Resazurin conversion. In Huh-7 cells, DPO increased the expression of p53. Interestingly, Huh-7 cells showed the highest basal TGF-β1 expression as compared to the other cell lines. Upon inhibition of TGF-β1 signaling, DPO no longer reduced viability in Huh-7 cells. On the contrary, co-incubation with TGF-β1 made the other cell lines responsive to DPO. Summarizing our data, we show that DPO reduces the growth of Huh-7 cells by up-regulation of the tumor-suppressor gene p53. This mechanism seems to be dependent on a strong TGF-β expression and corresponding signaling in these cells, as other cell lines became responsive to DPO with TGF-β1 supplementation. The knowledge of this mechanism offers great perspectives for the understanding and treatment of solid liver tumors.
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Akhtar M, Henderson T, Sutherland A, Vogel T, Friend P. Novel Approaches to Preventing Ischemia-Reperfusion Injury During Liver Transplantation. Transplant Proc 2013; 45:2083-92. [DOI: 10.1016/j.transproceed.2013.04.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 04/23/2013] [Indexed: 12/25/2022]
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An S, Soe K, Akamatsu M, Hishikawa Y, Koji T. Accelerated proliferation of hepatocytes in rats with iron overload after partial hepatectomy. Histochem Cell Biol 2012; 138:773-86. [PMID: 22825839 DOI: 10.1007/s00418-012-0994-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2012] [Indexed: 12/25/2022]
Abstract
Although iron overload is implicated in hepatocarcinogenesis, the precise mechanism was not known yet. In the present study, we investigated the effect of iron overload upon the induction of hepatocyte proliferation after 70% partial hepatectomy (PH) in rats fed with rat chow with 3% carbonyl iron for 3 months. In normal-diet rats, the increase in Ki-67 labeling index (LI) commenced at 24 h post-PH and the LIs of proliferating cell nuclear antigen (PCNA) incorporated 5-bromo-2'-deoxyuridine (BrdU) and phospho-histone H3 reached maximum values at 36 and 48 h after PH, respectively. In iron-overload rats, the above parameters occurred 12 h earlier compared to that of normal-diet rats, shortening the G0-G1 transition. Interestingly, nuclear staining for metallothionein (MT), which is essential for hepatocyte proliferation, was noted even at 0 h in iron-overload rats, while MT expression occurred at 6 h in the normal rats. Moreover, nuclear factor kappa B (NF-κB) expression, which is an essential early event leading to liver regeneration, was detected in Kupffer cells at 0 h in iron-overload rats. These results may indicate that overloaded iron, maybe through the induction of MT and NF-κB, may keep liver as a state ready to regenerate in response to PH, by bypassing signal transduction cascades involved in the initiation of liver regeneration.
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Affiliation(s)
- Shucai An
- Department of Histology and Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, 1-12-4, Sakamoto, Nagasaki, 852-8523, Japan
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Pavlica S, Milosevic J, Keller M, Schulze M, Peinemann F, Piscioneri A, De Bartolo L, Darsow K, Bartel S, Lange HA, Bader A. Erythropoietin enhances cell proliferation and survival of human fetal neuronal progenitors in normoxia. Brain Res 2012; 1452:18-28. [DOI: 10.1016/j.brainres.2012.02.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 02/10/2012] [Accepted: 02/17/2012] [Indexed: 12/11/2022]
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