1
|
Barzalobre-Geronimo R, Contreras-Ramos A, Cervantes-Cruz AI, Cruz M, Suárez-Sánchez F, Goméz-Zamudio J, Diaz-Rosas G, Ávalos-Rodríguez A, Díaz-Flores M, Ortega-Camarillo C. Pancreatic β-Cell Apoptosis in Normoglycemic Rats is Due to Mitochondrial Translocation of p53-Induced by the Consumption of Sugar-Sweetened Beverages. Cell Biochem Biophys 2023; 81:503-514. [PMID: 37392315 DOI: 10.1007/s12013-023-01147-y] [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] [Accepted: 06/21/2023] [Indexed: 07/03/2023]
Abstract
Overstimulation of pancreatic β-cells can lead to dysfunction and death, prior to the clinical manifestations of type 2 diabetes (T2D). The excessive consumption of carbohydrates induces metabolic alterations that can affect the functions of the β-cells and cause their death. We analyzed the role of p53 in pancreatic β cell death in carbohydrate-supplemented Sprague Dawley rats. For four months, the animals received drinking water containing either 40% sucrose or 40% fructose. The glucose tolerance test was performed at week 15. Apoptosis was assessed with the TUNEL assay (TdT-mediated dUTP-nick end-labeling). Bax, p53, and insulin were assessed by Western blotting, immunofluorescence, and real-time quantitative PCR. Insulin, triacylglycerol, and serum glucose and fatty acids in pancreatic tissue were measured. Carbohydrate consumption promotes apoptosis and mobilization of p53 from the cytosol to rat pancreatic β-cell mitochondria before blood glucose rises. An increase in p53, miR-34a, and Bax mRNA was also detected (P < 0.001) in the sucrose group. As well as hypertriglyceridemia, hyperinsulinemia, glucose intolerance, insulin resistance, visceral fat accumulation, and increased pancreatic fatty acids in the sucrose group. Carbohydrate consumption increases p53 and its mobilization into β-cell mitochondria and coincides with the increased rate of apoptosis, which occurs before serum glucose levels rise.
Collapse
Affiliation(s)
- Raúl Barzalobre-Geronimo
- Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México. CDMX, México, Mexico
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México
| | - Alejandra Contreras-Ramos
- Molecular Biology Research Lab Congenital Malformations Center, Children Hospital of Mexico Federico Gomez (HIMFG). CDMX, México, Mexico
| | - Aaron I Cervantes-Cruz
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México
| | - Miguel Cruz
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México
| | - Fernando Suárez-Sánchez
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México
| | - Jaime Goméz-Zamudio
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México
| | - Guadalupe Diaz-Rosas
- Molecular Biology Research Lab Congenital Malformations Center, Children Hospital of Mexico Federico Gomez (HIMFG). CDMX, México, Mexico
| | - Alejandro Ávalos-Rodríguez
- Deparment of Agricultural and Animal Prod, Universidad Autónoma Metropolitana- Xoch. CDMX, México, México
| | - Margarita Díaz-Flores
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México
| | - Clara Ortega-Camarillo
- Medical Research Unit in Biochemistry, Specialties Hospital, National Medical Center SXXI, Instituto Mexicano del Seguro Social. CDMX, México, México.
| |
Collapse
|
2
|
Chen SN, Mai ZY, Mai JN, Liang W, Dong ZX, Ju FE, Chan SH, Fang Z, Xu Y, Uziel O, He C, Zhang XD, Zheng Y. E2F2 modulates cell adhesion through the transcriptional regulation of PECAM1 in multiple myeloma. Br J Haematol 2023; 202:840-855. [PMID: 37365680 DOI: 10.1111/bjh.18958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 05/26/2023] [Accepted: 06/17/2023] [Indexed: 06/28/2023]
Abstract
Multiple myeloma (MM) is the second most common haematological malignancy. Despite the development of new drugs and treatments in recent years, the therapeutic outcomes of patients are not satisfactory. It is necessary to further investigate the molecular mechanism underlying MM progression. Herein, we found that high E2F2 expression was correlated with poor overall survival and advanced clinical stages in MM patients. Gain- and loss-of-function studies showed that E2F2 inhibited cell adhesion and consequently activated cell epithelial-to-mesenchymal transition (EMT) and migration. Further experiments revealed that E2F2 interacted with the PECAM1 promoter to suppress its transcriptional activity. The E2F2-knockdown-mediated promotion of cell adhesion was significantly reversed by the repression of PECAM1 expression. Finally, we observed that silencing E2F2 significantly inhibited viability and tumour progression in MM cell models and xenograft mouse models respectively. This study demonstrates that E2F2 plays a vital role as a tumour accelerator by inhibiting PECAM1-dependent cell adhesion and accelerating MM cell proliferation. Therefore, E2F2 may serve as a potential independent prognostic marker and therapeutic target for MM.
Collapse
Affiliation(s)
- Shu-Na Chen
- Department of Hematology, Institute of Hematology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Zhi-Ying Mai
- Department of Hematology, Institute of Hematology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Jun-Na Mai
- Department of Hematology, Institute of Hematology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Weiyao Liang
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Zhao-Xia Dong
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Fei-Er Ju
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Sze-Hoi Chan
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Zhigang Fang
- Department of Hematology, Institute of Hematology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Yichuan Xu
- Department of Hematology, Institute of Hematology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Orit Uziel
- The Felsenstein Medical Research Center, Institute of Hematology Rabin Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Chengwei He
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Xing-Ding Zhang
- Key Laboratory for Efficacy and Safety Evaluation of Hematological Malignancy Targeted Medicine of Guangdong Provincial Drug Administration, School of Medicine, Sun Yat-Sen University, Shenzhen, China
| | - Yongjiang Zheng
- Department of Hematology, Institute of Hematology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| |
Collapse
|
3
|
Xiao M, Wang J, Chen Y. E2F2 Promotes Wound Healing of Diabetic Foot Ulcer by Regulating CDCA7L Transcription. Exp Clin Endocrinol Diabetes 2023; 131:162-172. [PMID: 36893788 DOI: 10.1055/a-1989-1918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
OBJECTIVE The E2F2 transcription factor can accelerate cell proliferation and wound healing. However, its mechanism of action in a diabetic foot ulcer (DFU) remains unclear. Therefore, this study explores the influence of E2F2 on wound healing in DFU by examining cell division cycle-associated 7-like (CDCA7L) expression. METHODS CDCA7L and E2F2 expression in DFU tissues were analyzed with databases. CDCA7L and E2F2 expression were altered in human umbilical vein endothelial cells (HUVECs) and spontaneously transformed human keratinocyte cell culture (HaCaT) cells. Cell viability, migration, colony formation, and angiogenesis were evaluated. Binding of E2F2 to the CDCA7L promoter was examined. Subsequently, a diabetes mellitus (DM) mouse model was established and treated with full-thickness excision followed by CDCA7L overexpression. Wound healing in these mice was observed and recorded, and vascular endothelial growth factor receptor 2 (VEGFR2) and hematopoietic progenitor cell antigen CD34 (CD34) expression were determined. E2F2 and CDCA7L expression levels in cells and mice were evaluated. The expression of growth factors was tested. RESULTS CDCA7L expression was downregulated in DFU tissues and wound tissues from DM mice. Mechanistically, E2F2 bound to the CDCA7L promoter to upregulate CDCA7L expression. E2F2 overexpression enhanced viability, migration, and growth factor expression in HaCaT cells and HUVECs, and augmented HUVEC angiogenesis and HaCaT cell proliferation, which was nullified by silencing CDCA7L. In DM mice, CDCA7L overexpression facilitated wound healing and elevated the expression level of growth factors. CONCLUSIONS E2F2 facilitated cell proliferation and migration and fostered wound healing in DFU cells through binding to the CDCA7L promoter.
Collapse
Affiliation(s)
- Meimei Xiao
- Department of Hand and Foot Microsurgery, The Affiliated Nanhua Hospital, Hengyang Medical College, University of South China, Hengyang, Hunan, P.R. China
| | - Jiusong Wang
- Department of Hand and Foot Microsurgery, The Affiliated Nanhua Hospital, Hengyang Medical College, University of South China, Hengyang, Hunan, P.R. China
| | - Yanming Chen
- Department of Hand and Foot Microsurgery, The Affiliated Nanhua Hospital, Hengyang Medical College, University of South China, Hengyang, Hunan, P.R. China
| |
Collapse
|
4
|
Gao H, Zhou F, Li R, Yuan J, Ye L. E2F1 inhibits cellular senescence and promotes oxaliplatin resistance in colorectal cancer. ANNALS OF TRANSLATIONAL MEDICINE 2023; 11:185. [PMID: 36923082 PMCID: PMC10009566 DOI: 10.21037/atm-22-4054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 12/18/2022] [Indexed: 02/18/2023]
Abstract
Background Doctors have always been overwhelmed by tumor drug resistance because it is a major challenge in the clinical treatment of tumors. Cellular senescence has a strong relationship with the development of tumor drug resistance. Herein, we aimed to explore new regulatory factors involved in the aging process of colorectal cancer (CRC) cells and assess the effect of cellular senescence on CRC drug resistance. Methods Genes associated with cellular senescence for anticipating regulatory factors were first used, and the regulatory molecules of survival significance were then identified based on the results of public database analysis. The effects of E2F translation factor 1 (E2F1) on CRC cell viability, invasion, migration, and cellular senescence processes were assessed through 3-(4,5)-dimethylthiahiazo(-z-y1)-3,5-di-phenytetrazoliumromide (MTT), 5-Ethynyl-2'-deoxyuridine (EdU), Transwell, scar repairining, β-galactosidase staining, and cell immunofluorescence assays, respectively. Overexpression or silencing plasmids were used for transfecting HCT116 or OXA-HCT116 to assess the effect of E2F1 on the senescence process and drug resistance in CRC cells. Results On combining the database analysis results with those of our studies, we found that E2F1 was a critical regulator of cellular senescence in CRC. In the in vitro experiments, the E2F1 overexpression significantly stimulated the proliferation, invasion, and migration of CRC cells and even reduced oxaliplatin-induced senescence, further enhancing their resistance to oxaliplatin. Conversely, the tumorigenesis of colorectal cancer was repressed after the suppression of E2F1. Furthermore, CRC cells, which were otherwise resistant to oxaliplatin, also showed senescent phenotypes. Conclusions Our results suggest that E2F1 suppresses the aging of CRC cells and tumor cells develop resistance to oxaliplatin through high E2F1 expression. Moreover, E2F1 may act as a possible target for oxaliplatin resistance studies.
Collapse
Affiliation(s)
- Haiyang Gao
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fangyuan Zhou
- Department of Integrated Traditional Chinese and Western Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Runze Li
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiao Yuan
- Department of Biospecimen Centre, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lin Ye
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| |
Collapse
|
5
|
Hamidi M, Eriz A, Mitxelena J, Fernandez-Ares L, Aurrekoetxea I, Aspichueta P, Iglesias-Ara A, Zubiaga AM. Targeting E2F Sensitizes Prostate Cancer Cells to Drug-Induced Replication Stress by Promoting Unscheduled CDK1 Activity. Cancers (Basel) 2022; 14:cancers14194952. [PMID: 36230876 PMCID: PMC9564059 DOI: 10.3390/cancers14194952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 10/03/2022] [Indexed: 11/16/2022] Open
Abstract
Simple Summary E2F1 and E2F2 are highly expressed in many cancer types, but their contribution to malignancy is not well understood. Here we aimed to define the impact of E2F1/E2F2 deregulation in prostate cancer. We show that inhibition of E2F sensitizes prostate cancer cells to drug-induced replication stress and cell death. We found that E2F target genes involved in nucleotide biosynthesis contribute to maintaining genome stability in prostate cancer cells, but their enzymatic activity is insufficient to prevent replication stress after E2F1/E2F2 depletion. Instead, E2F1/E2F2 hinder premature CDK1 activation during S phase, which is key to ensure genome stability and viability of prostate cancer cells. From a therapeutic perspective, inhibiting E2F activity provokes catastrophic levels of replication stress and blunts xenograft growth in combination with drugs targeting nucleotide biosynthesis or DNA repair. Our results highlight the suitability of targeting E2F for the treatment of prostate cancer. Abstract E2F1/E2F2 expression correlates with malignancy in prostate cancer (PCa), but its functional significance remains unresolved. To define the mechanisms governed by E2F in PCa, we analyzed the contribution of E2F target genes to the control of genome integrity, and the impact of modulating E2F activity on PCa progression. We show that silencing or inhibiting E2F1/E2F2 induces DNA damage during S phase and potentiates 5-FU-induced replication stress and cellular toxicity. Inhibition of E2F downregulates the expression of E2F targets involved in nucleotide biosynthesis (TK1, DCK, TYMS), whose expression is upregulated by 5-FU. However, their enzymatic products failed to rescue DNA damage of E2F1/E2F2 knockdown cells, suggesting additional mechanisms for E2F function. Interestingly, targeting E2F1/E2F2 in PCa cells reduced WEE1 expression and resulted in premature CDK1 activation during S phase. Inhibition of CDK1/CDK2 prevented DNA damage induced by E2F loss, suggesting that E2F1/E2F2 safeguard genome integrity by restraining CDK1/CDK2 activity. Importantly, combined inhibition of E2F and ATR boosted replication stress and dramatically reduced tumorigenic capacity of PCa cells in xenografts. Collectively, inhibition of E2F in combination with drugs targeting nucleotide biosynthesis or DNA repair is a promising strategy to provoke catastrophic levels of replication stress that could be applied to PCa treatment.
Collapse
Affiliation(s)
- Mohaddase Hamidi
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
| | - Ainhoa Eriz
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
| | - Jone Mitxelena
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
- Ikerbasque—Basque Foundation for Science, 48009 Bilbao, Spain
| | - Larraitz Fernandez-Ares
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
| | - Igor Aurrekoetxea
- Department of Physiology, Faculty of Medicine and Nursing, University of Basque Country UPV/EHU, 48080 Bilbao, Spain
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
| | - Patricia Aspichueta
- Department of Physiology, Faculty of Medicine and Nursing, University of Basque Country UPV/EHU, 48080 Bilbao, Spain
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- National Institute for the Study of Liver and Gastrointestinal Diseases (CIBERehd, Instituto de Salud Carlos III), 28029 Madrid, Spain
| | - Ainhoa Iglesias-Ara
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
- Correspondence: (A.I.-A.); (A.M.Z.); Tel.: +34-94-601-5799 (A.I.-A.); +34-94-601-2603 (A.M.Z.); Fax: +34-94-601-3143 (A.M.Z.)
| | - Ana M. Zubiaga
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
- Correspondence: (A.I.-A.); (A.M.Z.); Tel.: +34-94-601-5799 (A.I.-A.); +34-94-601-2603 (A.M.Z.); Fax: +34-94-601-3143 (A.M.Z.)
| |
Collapse
|
6
|
Wang K, Liu J, Deng G, Ou Z, Li S, Xu X, Zhang M, Peng X, Chen F. LncSIK1 enhanced the sensitivity of AML cells to retinoic acid by the E2F1/autophagy pathway. Cell Prolif 2022; 55:e13185. [PMID: 35092119 PMCID: PMC8891555 DOI: 10.1111/cpr.13185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/28/2021] [Accepted: 12/30/2021] [Indexed: 11/26/2022] Open
Affiliation(s)
- Ke Wang
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| | - Jun‐da Liu
- Department of Anesthesiologythe First Affiliated Hospital of Anhui Medical UniversityHefeiChina
| | - Ge Deng
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| | - Zi‐yao Ou
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| | - Shu‐fang Li
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| | - Xiao‐ling Xu
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| | - Mei‐Ju Zhang
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| | - Xiao‐Qing Peng
- Department of Obstetrics and Gynecologythe First Affiliated Hospital of Anhui Medical UniversityHefeiChina
| | - Fei‐hu Chen
- School of PharmacyAnhui Medical UniversityHefeiChina
- Inflammation and Immune Mediated Diseases Laboratory of Anhui ProvinceAnhui Institute of Innovative DrugsHefeiChina
- Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina
| |
Collapse
|
7
|
Mustafa N, Mitxelena J, Infante A, Zenarruzabeitia O, Eriz A, Iglesias-Ara A, Zubiaga AM. E2f2 Attenuates Apoptosis of Activated T Lymphocytes and Protects from Immune-Mediated Injury through Repression of Fas and FasL. Int J Mol Sci 2021; 23:ijms23010311. [PMID: 35008734 PMCID: PMC8745065 DOI: 10.3390/ijms23010311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/20/2021] [Accepted: 12/25/2021] [Indexed: 12/03/2022] Open
Abstract
Targeted disruption of E2f2 in mice causes T-cell hyperactivation and a disproportionate cell cycle entry upon stimulation. However, E2f2−/− mice do not develop a lymphoproliferative condition. We report that E2f2 plays a Fas-dependent anti-apoptotic function in vitro and in vivo. TCR-stimulated murine E2f2−/− T cells overexpress the proapoptotic genes Fas and FasL and exhibit enhanced apoptosis, which is prevented by treatment with neutralizing anti-FasL antibodies. p53 pathway is activated in TCR-stimulated E2f2−/− lymphocytes, but targeted disruption of p53 in E2f2−/− mice does not abrogate Fas/FasL expression or apoptosis, implying a p53-independent apoptotic mechanism. We show that E2f2 is recruited to Fas and FasL gene promoters to repress their expression. in vivo, E2f2−/− mice are prone to develop immune-mediated liver injury owing to an aberrant lymphoid Fas/FasL activation. Taken together, our results suggest that E2f2-dependent inhibition of Fas/FasL pathway may play a direct role in limiting the development of immune-mediated pathologies.
Collapse
Affiliation(s)
- Noor Mustafa
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU, 48080 Bilbao, Spain; (N.M.); (J.M.); (A.E.)
| | - Jone Mitxelena
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU, 48080 Bilbao, Spain; (N.M.); (J.M.); (A.E.)
- Ikerbasque, Basque Foundation for Science, 48009 Bilbao, Spain
| | - Arantza Infante
- Stem Cells and Cell Therapy Laboratory, Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain;
| | - Olatz Zenarruzabeitia
- Immunopathology Group, Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain;
| | - Ainhoa Eriz
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU, 48080 Bilbao, Spain; (N.M.); (J.M.); (A.E.)
| | - Ainhoa Iglesias-Ara
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU, 48080 Bilbao, Spain; (N.M.); (J.M.); (A.E.)
- Correspondence: (A.I.-A.); (A.M.Z.); Tel.: +34-94-601-5799 (A.I.-A.); +34-94-601-2603 (A.M.Z.); Fax: +34-94-601-3143 (A.M.Z.)
| | - Ana M. Zubiaga
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU, 48080 Bilbao, Spain; (N.M.); (J.M.); (A.E.)
- Correspondence: (A.I.-A.); (A.M.Z.); Tel.: +34-94-601-5799 (A.I.-A.); +34-94-601-2603 (A.M.Z.); Fax: +34-94-601-3143 (A.M.Z.)
| |
Collapse
|
8
|
Sui Z, Sui X. Long non-coding RNA TMPO-AS1 promotes cell proliferation, migration, invasion and epithelial-to-mesenchymal transition in gallbladder carcinoma by regulating the microRNA-1179/E2F2 axis. Oncol Lett 2021; 22:855. [PMID: 34777589 PMCID: PMC8581476 DOI: 10.3892/ol.2021.13116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 09/19/2021] [Indexed: 12/29/2022] Open
Abstract
Gallbladder carcinoma (GBC), which is a common tumor of the biliary system, poses a serious threat to human life and health. The present study aimed to investigate the molecular mechanism of the long non-coding (lnc)RNA thymopoietin antisense transcript 1 (TMPO-AS1)/microRNA (miRNA/miR)-1179/E2F transcription factor 2 (E2F2) axis in GBC. The viability, proliferation, migration, invasion and epithelial-to-mesenchymal transition (EMT) of GBC cell lines were assessed via the Cell Counting Kit-8, colony formation, Transwell migration and invasion, immunofluorescence and western blot assays. In the present study, lncRNA TMPO-AS1 was significantly upregulated in clinical GBC tissues and cell lines, and was highly expressed in stage III+IV patients with GBC compared with stage I+II patients with GBC. In addition, the overall survival rate of patients with low TMPO-AS1 expression levels was higher than those with high TMPO-AS1 expression levels. Furthermore, TMPO-AS1 knockdown inhibited the viability, proliferation, migration, invasion and EMT of GBC cell lines. In addition, miR-1179 expression was downregulated in clinical GBC tissues and cell lines, and negatively correlated with TMPO-AS1 expression. The results revealed that miR-1179 is a target of TMPO-AS1, which was confirmed via the dual-luciferase reporter assay and RNA pull-down analysis. Overexpression of miR-1179 inhibited the viability, proliferation, migration, invasion and EMT of GBC cell lines. Furthermore, E2F2 was verified as a direct target of miR-1179 by binding to its 3'-untranslated region. E2F2 expression was significantly upregulated in clinical GBC tissues and cell lines, and negatively correlated with miR-1179 expression. Notably, E2F2 knockdown partially hindered the effects of TMPO-AS1/miR-1179 on the proliferation and metastasis of GBC cell lines. Taken together, the results of the present study suggest that TMPO-AS1 potentially plays a tumor-promoting role in the occurrence and development of GBC, which may be achieved by regulating the miR-1179/E2F2 axis.
Collapse
Affiliation(s)
- Zhenghui Sui
- Department of General Surgery, The People's Hospital of Danyang and Affiliated Danyang Hospital of Nantong University, Danyang, Jiangsu 212300, P.R. China
| | - Xin Sui
- Department of General Surgery, The People's Hospital of Danyang and Affiliated Danyang Hospital of Nantong University, Danyang, Jiangsu 212300, P.R. China
| |
Collapse
|
9
|
Abstract
E2F transcription factor 2 (E2F2) is a member of the E2F family of transcription factors. The classical view is that some E2Fs act as "activators" and others "inhibitors" of cell cycle gene expression. However, the so-called "activator" E2F2 is particularly enigmatic, with seemingly contradictory roles in the cell cycle, proliferation, apoptosis, inflammation, and cell migration and invasion. How can we rationalize the apparently opposing functions of E2F2 in different situations? This is difficult because different methods of studying E2F2 have yielded conflicting results, so extrapolating mechanisms from an observed endpoint is challenging. This review will attempt to summarize and clarify these issues. This review focuses on genetic studies that have helped elucidate the biological functions of E2F2 and that have enhanced our understanding of how E2F2 is integrated into pathways controlling the cell cycle, proliferation, apoptosis, inflammation, and cell migration and invasion. This review will also discuss the function of E2F2 in cancer and other diseases. This review provides a strong basis for further research on the biological function and clinical potential of E2F2.
Collapse
Affiliation(s)
- Luwen Li
- Biomedical Sciences College & Shandong Medicinal Biotechnology Centre, Shandong First Medical University, Ji'nan, China.,Key Lab for Biotech-Drugs of National Health Commission, Ji'nan, China.,Key Lab for Rare & Uncommon Diseases of Shandong Province, Shandong First Medical University, Ji'nan, China
| | - Shiguan Wang
- Medical College, Shandong University, Ji'nan, China
| | - Yihang Zhang
- Biomedical Sciences College & Shandong Medicinal Biotechnology Centre, Shandong First Medical University, Ji'nan, China.,Key Lab for Biotech-Drugs of National Health Commission, Ji'nan, China.,Key Lab for Rare & Uncommon Diseases of Shandong Province, Shandong First Medical University, Ji'nan, China
| | - Jihong Pan
- Biomedical Sciences College & Shandong Medicinal Biotechnology Centre, Shandong First Medical University, Ji'nan, China.,Key Lab for Biotech-Drugs of National Health Commission, Ji'nan, China.,Key Lab for Rare & Uncommon Diseases of Shandong Province, Shandong First Medical University, Ji'nan, China
| |
Collapse
|
10
|
E2F2 stimulates CCR4 expression and activates synovial fibroblast-like cells in rheumatoid arthritis. Cent Eur J Immunol 2021; 46:27-37. [PMID: 33897281 PMCID: PMC8056345 DOI: 10.5114/ceji.2021.105243] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 10/03/2019] [Indexed: 01/01/2023] Open
Abstract
Aim of the study E2F transcription factor 2 (E2F2) has increased expression in synovial tissues of rheumatoid arthritis (RA) and stimulates interleukin (IL)-1 α and IL-β production in cultured RA synovial fibroblast-like cells (RASF), which supports the importance of E2F2 in RA pathogenesis. This study investigated the effect and mechanism of E2F2 in RA. Material and methods Cultured RASF were transfected with anti-E2F2 siRNA, and the expression profile was analyzed with an inflammatory response and autoimmunity PCR array loaded with 84-relative genes to explore the pathogenic pathway of E2F2. Apoptosis, migration and tube-like structure formation in the RASF with transfection of anti-E2F2 siRNA or E2F2-expressing plasmids were examined using flow cytometry, transwell assays and Matrigel assays, respectively. Results Significantly decreased expression of chemokine receptor 4 (CCR4) was detected in RASF with inhibited E2F2 expression, and the CCR4 expression was increased in RASF with transfection of E2F2-expressing plasmids. Silencing E2F2 expression stimulated apoptosis, but retarded migration and tube-like structure formation in RASF. The opposite observation was obtained in RASF with E2F2 overexpression. Conclusions High E2F2 expression decreases apoptosis and increases migration and tube-like structure ability in RASF and might perform this role by up-regulating CCR4 expression, which ultimately contributes to the disease progression of RA synovial tissues.
Collapse
|
11
|
Watanabe K, Shibuya S, Ozawa Y, Toda T, Shimizu T. Pathological Relationship between Intracellular Superoxide Metabolism and p53 Signaling in Mice. Int J Mol Sci 2021; 22:3548. [PMID: 33805584 PMCID: PMC8037821 DOI: 10.3390/ijms22073548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/23/2021] [Accepted: 03/23/2021] [Indexed: 11/16/2022] Open
Abstract
Intracellular superoxide dismutases (SODs) maintain tissue homeostasis via superoxide metabolism. We previously reported that intracellular reactive oxygen species (ROS), including superoxide accumulation caused by cytoplasmic SOD (SOD1) or mitochondrial SOD (SOD2) insufficiency, induced p53 activation in cells. SOD1 loss also induced several age-related pathological changes associated with increased oxidative molecules in mice. To evaluate the contribution of p53 activation for SOD1 knockout (KO) (Sod1-/-) mice, we generated SOD1 and p53 KO (double-knockout (DKO)) mice. DKO fibroblasts showed increased cell viability with decreased apoptosis compared with Sod1-/- fibroblasts. In vivo experiments revealed that p53 insufficiency was not a great contributor to aging-like tissue changes but accelerated tumorigenesis in Sod1-/- mice. Furthermore, p53 loss failed to improve dilated cardiomyopathy or the survival in heart-specific SOD2 conditional KO mice. These data indicated that p53 regulated ROS-mediated apoptotic cell death and tumorigenesis but not ROS-mediated tissue degeneration in SOD-deficient models.
Collapse
Affiliation(s)
- Kenji Watanabe
- Aging Stress Response Research Project Team, National Center for Geriatrics and Gerontology, Obu 474-8511, Aichi, Japan; (K.W.); (S.S.)
| | - Shuichi Shibuya
- Aging Stress Response Research Project Team, National Center for Geriatrics and Gerontology, Obu 474-8511, Aichi, Japan; (K.W.); (S.S.)
| | - Yusuke Ozawa
- Department of Endocrinology, Hematology and Gerontology, Chiba University Graduate School of Medicine, Chiba 260-8677, Chiba, Japan; (Y.O.); (T.T.)
| | - Toshihiko Toda
- Department of Endocrinology, Hematology and Gerontology, Chiba University Graduate School of Medicine, Chiba 260-8677, Chiba, Japan; (Y.O.); (T.T.)
| | - Takahiko Shimizu
- Aging Stress Response Research Project Team, National Center for Geriatrics and Gerontology, Obu 474-8511, Aichi, Japan; (K.W.); (S.S.)
- Department of Endocrinology, Hematology and Gerontology, Chiba University Graduate School of Medicine, Chiba 260-8677, Chiba, Japan; (Y.O.); (T.T.)
| |
Collapse
|
12
|
Campbell-Thompson M, Butterworth EA, Boatwright JL, Nair MA, Nasif LH, Nasif K, Revell AY, Riva A, Mathews CE, Gerling IC, Schatz DA, Atkinson MA. Islet sympathetic innervation and islet neuropathology in patients with type 1 diabetes. Sci Rep 2021; 11:6562. [PMID: 33753784 PMCID: PMC7985489 DOI: 10.1038/s41598-021-85659-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 03/04/2021] [Indexed: 02/07/2023] Open
Abstract
Dysregulation of glucagon secretion in type 1 diabetes (T1D) involves hypersecretion during postprandial states, but insufficient secretion during hypoglycemia. The sympathetic nervous system regulates glucagon secretion. To investigate islet sympathetic innervation in T1D, sympathetic tyrosine hydroxylase (TH) axons were analyzed in control non-diabetic organ donors, non-diabetic islet autoantibody-positive individuals (AAb), and age-matched persons with T1D. Islet TH axon numbers and density were significantly decreased in AAb compared to T1D with no significant differences observed in exocrine TH axon volume or lengths between groups. TH axons were in close approximation to islet α-cells in T1D individuals with long-standing diabetes. Islet RNA-sequencing and qRT-PCR analyses identified significant alterations in noradrenalin degradation, α-adrenergic signaling, cardiac β-adrenergic signaling, catecholamine biosynthesis, and additional neuropathology pathways. The close approximation of TH axons at islet α-cells supports a model for sympathetic efferent neurons directly regulating glucagon secretion. Sympathetic islet innervation and intrinsic adrenergic signaling pathways could be novel targets for improving glucagon secretion in T1D.
Collapse
Affiliation(s)
- Martha Campbell-Thompson
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA. .,Department of Biomedical Engineering, College of Engineering, University of Florida, Gainesville, FL, 32610, USA.
| | - Elizabeth A Butterworth
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - J Lucas Boatwright
- Bioinformatics Core, Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, 32610, USA
| | - Malavika A Nair
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Lith H Nasif
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Kamal Nasif
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Andy Y Revell
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Alberto Riva
- Bioinformatics Core, Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, 32610, USA
| | - Clayton E Mathews
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Ivan C Gerling
- Department of Medicine-Endocrinology, University of Tennessee Health Science Center, Memphis, TN, 38163, USA
| | - Desmond A Schatz
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Mark A Atkinson
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.,Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| |
Collapse
|
13
|
Fouad S, Hauton D, D'Angiolella V. E2F1: Cause and Consequence of DNA Replication Stress. Front Mol Biosci 2021; 7:599332. [PMID: 33665206 PMCID: PMC7921158 DOI: 10.3389/fmolb.2020.599332] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 11/30/2020] [Indexed: 12/12/2022] Open
Abstract
In mammalian cells, cell cycle entry occurs in response to the correct stimuli and is promoted by the transcriptional activity of E2F family members. E2F proteins regulate the transcription of S phase cyclins and genes required for DNA replication, DNA repair, and apoptosis. The activity of E2F1, the archetypal and most heavily studied E2F family member, is tightly controlled by the DNA damage checkpoints to modulate cell cycle progression and initiate programmed cell death, when required. Altered tumor suppressor and oncogenic signaling pathways often result in direct or indirect interference with E2F1 regulation to ensure higher rates of cell proliferation independently of external cues. Despite a clear link between dysregulated E2F1 activity and cancer progression, literature on the contribution of E2F1 to DNA replication stress phenotypes is somewhat scarce. This review discusses how dysfunctional tumor suppressor and oncogenic signaling pathways promote the disruption of E2F1 transcription and hence of its transcriptional targets, and how such events have the potential to drive DNA replication stress. In addition to the involvement of E2F1 upstream of DNA replication stress, this manuscript also considers the role of E2F1 as a downstream effector of the response to this type of cellular stress. Lastly, the review introduces some reflections on how E2F1 activity is integrated with checkpoint control through post-translational regulation, and proposes an exploitable tumor weakness based on this axis.
Collapse
Affiliation(s)
- Shahd Fouad
- Department of Oncology, Medical Research Council Oxford Institute for Radiation Oncology, University of Oxford, Oxford, United Kingdom
| | - David Hauton
- Department of Oncology, Medical Research Council Oxford Institute for Radiation Oncology, University of Oxford, Oxford, United Kingdom
| | - Vincenzo D'Angiolella
- Department of Oncology, Medical Research Council Oxford Institute for Radiation Oncology, University of Oxford, Oxford, United Kingdom
| |
Collapse
|
14
|
Tatsuoka H, Sakamoto S, Yabe D, Kabai R, Kato U, Okumura T, Botagarova A, Tokumoto S, Usui R, Ogura M, Nagashima K, Mukai E, Fujitani Y, Watanabe A, Inagaki N. Single-Cell Transcriptome Analysis Dissects the Replicating Process of Pancreatic Beta Cells in Partial Pancreatectomy Model. iScience 2020; 23:101774. [PMID: 33294783 PMCID: PMC7689163 DOI: 10.1016/j.isci.2020.101774] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 10/16/2020] [Accepted: 11/03/2020] [Indexed: 12/17/2022] Open
Abstract
Heterogeneity of gene expression and rarity of replication hamper molecular analysis of β-cell mass restoration in adult pancreas. Here, we show transcriptional dynamics in β-cell replication process by single-cell RNA sequencing of murine pancreas with or without partial pancreatectomy. We observed heterogeneity of Ins1-expressing β-cells and identified the one cluster as replicating β-cells with high expression of cell proliferation markers Pcna and Mki67. We also recapitulated cell cycle transition accompanied with switching expression of cyclins and E2F transcription factors. Both transient activation of endoplasmic reticulum stress responders like Atf6 and Hspa5 and elevated expression of tumor suppressors like Trp53, Rb1, and Brca1 and DNA damage responders like Atm, Atr, Rad51, Chek1, and Chek2 during the transition to replication associated fine balance of cell cycle progression and protection from DNA damage. Taken together, these results provide a high-resolution map depicting a sophisticated genetic circuit for replication of the β-cells. Single cell RNA sequencing dissects a sequence of replication process of beta cells ER stress responders are transiently activated in initiation of the proliferation Physiological replication accompanied with induced expression of tumor suppressors Fine balance of proliferation genes and tumor suppressors is a key of the replication
Collapse
Affiliation(s)
- Hisato Tatsuoka
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Satoko Sakamoto
- Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Daisuke Yabe
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Department of Diabetes and Endocrinology, Gifu University Graduate School of Medicine, Gifu, Japan.,Yutaka Seino Distinguished Center for Diabetes Research, Kansai Electric Power Medical Research Institute, Hyogo, Japan.,Division of Molecular and Metabolic Medicine, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Hyogo, Japan
| | - Ryotaro Kabai
- Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Unyanee Kato
- Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Tatsuya Okumura
- Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Ainur Botagarova
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Shinsuke Tokumoto
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Ryota Usui
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Masahito Ogura
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Kazuaki Nagashima
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Eri Mukai
- Laboratory of Medical Physiology and Metabolism, Department of Biomedical Sciences, College of Life Sciences, Ritsumeikan University, Shiga, Japan
| | - Yoshio Fujitani
- Laboratory of Developmental Biology and Metabolism, Institute for Molecular & Cellular Regulation, Gunma University, Gunma, Japan
| | - Akira Watanabe
- Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Nobuya Inagaki
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan
| |
Collapse
|
15
|
Zeng Z, Cao Z, Tang Y. Increased E2F2 predicts poor prognosis in patients with HCC based on TCGA data. BMC Cancer 2020; 20:1037. [PMID: 33115417 PMCID: PMC7594443 DOI: 10.1186/s12885-020-07529-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 10/15/2020] [Indexed: 02/07/2023] Open
Abstract
Background The E2F family of transcription factor 2 (E2F2) plays an important role in the development and progression of various tumors, but its association with hepatocellular carcinoma (HCC) remains unknown. Our study aimed to investigate the role and clinical significance of E2F2 in HCC. Methods HCC raw data were extracted from The Cancer Genome Atlas (TCGA). Wilcoxon signed-rank test, Kruskal-Wallis test and logistic regression were applied to analyze the relationship between the expression of E2F2 and clinicopathologic characteristics. Cox regression and Kaplan-Meier were employed to evaluate the correlation between clinicopathologic features and survival. The biological function of E2F2 was annotated by Gene Set Enrichment Analysis (GSEA). Results The expression of E2F2 was increased in HCC samples. The expression of elevated E2F2 in HCC samples was prominently correlated with histologic grade (OR = 2.62 for G3–4 vs. G1–2, p = 1.80E-05), clinical stage (OR = 1.74 for III-IV vs. I-II, p = 0.03), T (OR = 1.64 for T3–4 vs.T1–2, p = 0.04), tumor status (OR = 1.88 for with tumor vs. tumor free, p = 3.79E-03), plasma alpha fetoprotein (AFP) value (OR = 3.18 for AFP ≥ 400 vs AFP<20, p = 2.16E-04; OR = 2.50 for 20 ≤ AFP<400 vs AFP<20, p = 2.56E-03). Increased E2F2 had an unfavorable OS (p = 7.468e− 05), PFI (p = 3.183e− 05), DFI (p = 0.001), DSS (p = 4.172e− 05). Elevated E2F2 was independently bound up with OS (p = 0.004, hazard ratio [HR] = 2.4 (95% CI [1.3–4.2])), DFI (P = 0.029, hazard ratio [HR] = 2.0 (95% CI [1.1–3.7])) and PFI (P = 0.005, hazard ratio [HR] = 2.2 (95% CI [1.3–3.9])). GSEA disclosed that cell circle, RNA degradation, pyrimidine metabolism, base excision repair, aminoacyl tRNA biosynthesis, DNA replication, p53 signaling pathway, nucleotide excision repair, ubiquitin-mediated proteolysis, citrate cycle TCA cycle were notably enriched in E2F2 high expression phenotype. Conclusions Elevated E2F2 can be a promising independent prognostic biomarker and therapeutic target for HCC. Additionally, cell cycle, pyrimidine metabolism, DNA replication, p53 signaling pathway, ubiquitin-mediated proteolysis, the citrate cycle TCA cycle may be the key pathway by which E2F2 participates in the initial and progression of HCC.
Collapse
Affiliation(s)
- Zhili Zeng
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, Guangdong, China
| | - Zebiao Cao
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, Guangdong, China
| | - Ying Tang
- Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, no.12, Airport Road, Sanyuanli Street, Baiyun District, Guangzhou, 510405, Guangdong, China.
| |
Collapse
|
16
|
Yang C, Wu Y, Yi Z, Zeng N, Ren Y, Xu Y, Zeng H, Deng P, Zhang Q, Wu M. Knockout of E2F1 Inhibits Adipose Stem Cell Proliferation and Differentiation in Fat Transplantation by Repressing Peroxisome Proliferator-Activated Receptor Gamma Expression. Transplant Proc 2020; 53:466-473. [PMID: 32482448 DOI: 10.1016/j.transproceed.2020.02.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 02/07/2020] [Accepted: 02/15/2020] [Indexed: 10/24/2022]
Abstract
Adipose-derived stem cells (ADSCs) possess pluripotent differentiation potential and self-replication ability, which is highly significant in the field of tissue engineering. Cell-assisted lipotransfer (CAL) with ADSCs benefits fat survival. In this study, we focus on the effect of transcription factor E2F1 during CAL. The wild-type (WT) ADSCs were mixed with WT adipocytes, and the E2F1-/- ADSCs were mixed with E2F1-/- adipocytes. Then 2 cell mixtures were inoculated on the back 2 sides of E2F1-/- mice, respectively denoted as the WT group (WT ADSCs + WT adipose cells) and E2F1-/- group (E2F1-/- ADSCs + E2F1-/- adipose cells). At week 4, the fat graft was heavier in the WT group, with less necrotic area, more survival of mature adipocytes, and more proliferating ADSCs, compared with the E2F1-/- group. More capillaries were transformed from ADSCs in the WT group than in the E2F1-/- group. The in vitro protein levels of peroxisome proliferator-activated receptor gamma (PPAR-γ) were higher in WT ADSCs than in E2F1-/- ADSCs. Therefore, these findings suggest that knockout of E2F1 could affect ADSCs to inhibit the survival of fat grafts by downregulating PPAR-γ expression.
Collapse
Affiliation(s)
- Changchun Yang
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yiping Wu
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhen Yi
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ning Zeng
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yuping Ren
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yi Xu
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hong Zeng
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Pei Deng
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qi Zhang
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Min Wu
- Department of Plastic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| |
Collapse
|
17
|
Gonzalez A. Antioxidants and Neuron-Astrocyte Interplay in Brain Physiology: Melatonin, a Neighbor to Rely on. Neurochem Res 2020; 46:34-50. [PMID: 31989469 DOI: 10.1007/s11064-020-02972-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/19/2020] [Accepted: 01/21/2020] [Indexed: 12/19/2022]
Abstract
This manuscript is a review focused onto the role of astrocytes in the protection of neurons against oxidative stress and how melatonin can contribute to the maintenance of brain homeostasis. The first part of the review is dedicated to the dependence of neurons on astrocytes by terms of survival under oxidative stress conditions. Additionally, the effects of melatonin against oxidative stress in the brain and its putative role in the protection against diseases affecting the brain are highlighted. The effects of melatonin on the physiology of neurons and astrocytes also are reviewed.
Collapse
Affiliation(s)
- Antonio Gonzalez
- Department of Physiology, Institute of Molecular Pathology Biomarkers, University of Extremadura, Avenida de las Ciencias s/n, 10003, Cáceres, Spain.
| |
Collapse
|
18
|
Zhao H, Duan ZH. Cancer Genetic Network Inference Using Gaussian Graphical Models. Bioinform Biol Insights 2019; 13:1177932219839402. [PMID: 31007526 PMCID: PMC6456846 DOI: 10.1177/1177932219839402] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 03/04/2019] [Indexed: 02/06/2023] Open
Abstract
The Cancer Genome Atlas (TCGA) provides a rich resource that can be used to
understand how genes interact in cancer cells and has collected RNA-Seq gene
expression data for many types of human cancer. However, mining the data to
uncover the hidden gene-interaction patterns remains a challenge. Gaussian
graphical model (GGM) is often used to learn genetic networks because it defines
an undirected graphical structure, revealing the conditional dependences of
genes. In this study, we focus on inferring gene interactions in 15 specific
types of human cancer using RNA-Seq expression data and GGM with graphical
lasso. We take advantage of the corresponding Kyoto Encyclopedia of Genes and
Genomes pathway maps to define the subsets of related genes. RNA-Seq expression
levels of the subsets of genes in solid cancerous tumor and normal tissues were
extracted from TCGA. The gene expression data sets were cleaned and formatted,
and the genetic network corresponding to each cancer type was then inferred
using GGM with graphical lasso. The inferred networks reveal stable conditional
dependences among the genes at the expression level and confirm the essential
roles played by the genes that encode proteins involved in the two key signaling
pathway phosphoinositide 3-kinase (PI3K)/AKT/mTOR and Ras/Raf/MEK/ERK in human
carcinogenesis. These stable dependences elucidate the expression level
interactions among the genes that are implicated in many different human
cancers. The inferred genetic networks were examined to further identify and
characterize a collection of gene interactions that are unique to cancer. The
cross-cancer genetic interactions revealed from our study provide another set of
knowledge for cancer biologists to propose strong hypotheses, so further
biological investigations can be conducted effectively.
Collapse
Affiliation(s)
- Haitao Zhao
- Integrated Bioscience Program, The University of Akron, Akron, OH, USA.,Department of Computer Science, The University of Akron, Akron, OH, USA
| | - Zhong-Hui Duan
- Integrated Bioscience Program, The University of Akron, Akron, OH, USA.,Department of Computer Science, The University of Akron, Akron, OH, USA
| |
Collapse
|
19
|
Dosil MA, Navaridas R, Mirantes C, Tarragona J, Eritja N, Felip I, Urdanibia I, Megino C, Domingo M, Santacana M, Gatius S, Piñol C, Barceló C, Maiques O, Macià A, Velasco A, Vaquero M, Matias-Guiu X, Dolcet X. Tumor suppressive function of E2F-1 on PTEN-induced serrated colorectal carcinogenesis. J Pathol 2018; 247:72-85. [DOI: 10.1002/path.5168] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 08/22/2018] [Accepted: 09/04/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Maria A Dosil
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| | - Raúl Navaridas
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Cristina Mirantes
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Jordi Tarragona
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| | - Núria Eritja
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| | - Isidre Felip
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Izaskun Urdanibia
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Cristina Megino
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Mónica Domingo
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Maria Santacana
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| | - Sònia Gatius
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| | - Carme Piñol
- Department de Medicina; Universitat de Lleida-Institut de Recerca Biomèdica de Lleida (IRBLleida); Lleida Spain
| | - Carla Barceló
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Oscar Maiques
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Anna Macià
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
| | - Ana Velasco
- Department of Pathology and Molecular Genetics; Hospital Universitari Arnau de Vilanova, University of Lleida, IRBLleida; Lleida Spain
| | - Marta Vaquero
- Department of Pathology and Molecular Genetics; Hospital Universitari Arnau de Vilanova, University of Lleida, IRBLleida; Lleida Spain
| | - Xavier Matias-Guiu
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| | - Xavier Dolcet
- Oncologic Pathology Group, Department de Ciències Mèdiques Bàsiques, Universitat de Lleida, Hospital Universitari Arnau de Vilanova; Institut de Recerca Biomèdica de Lleida, IRBLleida; Lleida Spain
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC); Madrid Spain
| |
Collapse
|
20
|
Transcriptomic analysis of CIC and ATXN1L reveal a functional relationship exploited by cancer. Oncogene 2018; 38:273-290. [PMID: 30093628 DOI: 10.1038/s41388-018-0427-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 06/01/2018] [Accepted: 07/02/2018] [Indexed: 12/24/2022]
Abstract
Aberrations in Capicua (CIC) have recently been implicated as a negative prognostic factor in a multitude of cancer types through activation of the MAPK signalling cascade and derepression of oncogenic ETS transcription factors. The Ataxin-family protein ATXN1L has previously been reported to interact with CIC in developmental and disease contexts to facilitate the repression of CIC target genes. To further investigate this relationship, we performed functional in vitro studies utilizing ATXN1LKO and CICKO human cell lines and characterized a reciprocal functional relationship between CIC and ATXN1L. Transcriptomic interrogation of the CIC-ATXN1-ATXN1L axis in low-grade glioma, prostate adenocarcinoma and stomach adenocarcinoma TCGA cohorts revealed context-dependent convergence of gene sets and pathways related to mitotic cell cycle and division. This study highlights the CIC-ATXN1-ATXN1L axis as a more potent regulator of the cell cycle than previously appreciated.
Collapse
|
21
|
Atypical E2f functions are critical for pancreas polyploidization. PLoS One 2018; 13:e0190899. [PMID: 29329320 PMCID: PMC5766144 DOI: 10.1371/journal.pone.0190899] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 12/21/2017] [Indexed: 02/06/2023] Open
Abstract
The presence of polyploid cells in the endocrine and exocrine pancreas has been reported for four decades. In rodents, pancreatic polyploidization is initiated after weaning and the number of polyploid cells increases with age. Surprisingly the molecular regulators and biological functions of polyploidization in the pancreas are still unknown. We discovered that atypical E2f activity is essential for polyploidization in the pancreas, using an inducible Cre/LoxP approach in new-born mice to delete ubiquitously the atypical E2f transcription factors, E2f7 and E2f8. In contrast to its critical role in embryonic survival, conditional deletion of both of both atypical E2fs in newborn mice had no impact on postnatal survival and mice lived until old age. However, deficiency of E2f7 or E2f8 alone was sufficient to suppress polyploidization in the pancreas and associated with only a minor decrease in blood serum levels of glucose, insulin, amylase and lipase under 4 hours starvation condition compared to wildtype littermates. In mice with fewer pancreatic polyploid cells that were fed ad libitum, no major impact on hormones or enzymes levels was observed. In summary, we identified atypical E2fs to be essential for polyploidization in the pancreas and discovered that postnatal induced loss of both atypical E2fs in many organs is compatible with life until old age.
Collapse
|
22
|
The NAMPT/E2F2/SIRT1 axis promotes proliferation and inhibits p53-dependent apoptosis in human melanoma cells. Biochem Biophys Res Commun 2017; 493:77-84. [PMID: 28919418 DOI: 10.1016/j.bbrc.2017.09.071] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 09/13/2017] [Indexed: 02/08/2023]
Abstract
Melanoma is the most common primary malignant neoplasm in adults, causing more deaths than any other skin cancer, necessitating the development of new target-based approaches. Current evidence suggests SIRT1, the mammalian nicotinamide adenine dinucleotide (NAD+)-dependent protein deacetylase, and nicotinamide phosphoribosyltransferase (NAMPT), the rate-limiting NAD+ biosynthetic enzyme, together comprise a novel systemic regulatory network to play a pivotal role in cell proliferation and apoptosis. Nevertheless, how the regulation of this cofactor interfaces with signal transduction network remains poorly understood in melanoma. Here, we report NAMPT is highly expressed in melanomaassociated with poor overall survival in patients. Pharmacological and genetic inhibition of NAMPT decreased NAD+ levels and melanoma cell proliferation capacity, and NAMPT knockdown induced apoptosis through the activity of the tumor suppressor p53. Next, we demonstrate NAMPT regulates the transcription factor E2F family member 2 (E2F2) in the apoptosis process. Downstream, E2F2 control the mRNA and protein levels of SIRT1. Finally, we find NAMPT mediates the apoptosis resistance of melanoma cells through NAMPT-E2F2-SIRT1 axis, more than NAD+-driven transcriptional program. Accordingly, our results demonstrated that NAMPT is a prognostic marker in melanoma, and the identificationofNAMPT-E2F2-SIRT1 pathway establishes another link between NAMPT and apoptosis events in melanoma, with therapeutic implications for this deadly cancer.
Collapse
|
23
|
Zhu J, Wang J, Chen X, Tsompana M, Gaile D, Buck M, Ren X. A time-series analysis of altered histone H3 acetylation and gene expression during the course of MMAIII-induced malignant transformation of urinary bladder cells. Carcinogenesis 2017; 38:378-390. [PMID: 28182198 DOI: 10.1093/carcin/bgx011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 01/26/2017] [Indexed: 01/05/2023] Open
Abstract
Our previous studies have shown that chronic exposure to low doses of monomethylarsonous acid (MMAIII) causes global histone acetylation dysregulation in urothelial cells (UROtsa cells) during the course of malignant transformation. To reveal the relationship between altered histone acetylation patterns and aberrant gene expression, more specifically, the carcinogenic relevance of these alterations, we performed a time-course analysis of the binding patterns of histone 3 lysine 18 acetylation (H3K18ac) across the genome and generated global gene-expression profiles from this UROtsa cell malignant transformation model. We showed that H3K18ac, one of the most significantly upregulated histone acetylation sites following MMAIII exposure, was enriched at gene promoter-specific regions across the genome and that MMAIII-induced upregulation of H3K18ac led to an altered binding pattern in a large number of genes that was most significant during the critical window for MMAIII-induced UROtsa cells' malignant transformation. Some genes identified as having a differential binding pattern with H3K18ac, acted as upstream regulators of critical gene networks with known functions in tumor development and progression. The altered H3K18ac binding patterns not only led to changes in expression of these directly affected upstream regulators but also resulted in gene-expression changes in their regulated networks. Collectively, our data suggest that MMAIII-induced alteration of histone acetylation patterns in UROtsa cells led to a time- and malignant stage-dependent aberrant gene-expression pattern, and that some gene regulatory networks were altered in accordance with their roles in carcinogenesis, probably contributing to MMAIII-induced urothelial cell malignant transformation and carcinogenesis.
Collapse
Affiliation(s)
- Jinqiu Zhu
- Department of Epidemiology and Environmental Health
| | | | - Xushen Chen
- Department of Epidemiology and Environmental Health
| | | | | | | | - Xuefeng Ren
- Department of Epidemiology and Environmental Health.,Department of Pharmacology and Toxicology, The State University of New York, Buffalo, NY, USA
| |
Collapse
|
24
|
Ge M, Chen C, Yao W, Zhou S, Huang F, Cai J, Hei Z. Overexpression of Brg1 Alleviates Hepatic Ischemia/Reperfusion-Induced Acute Lung Injury through Antioxidative Stress Effects. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:8787392. [PMID: 28798861 PMCID: PMC5534314 DOI: 10.1155/2017/8787392] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 05/19/2017] [Accepted: 06/13/2017] [Indexed: 01/06/2023]
Abstract
AIM To investigate whether overexpression of Brahma-related gene-1 (Brg1) can alleviate lung injury induced by hepatic ischemia/reperfusion (HIR) and its precise mechanism. METHODS Cytomegalovirus-transgenic Brg1-overexpressing (CMV-Brg1) mice and wild-type (WT) C57BL/6 mice underwent HIR. Lung histology, oxidative injury markers, and antioxidant enzyme concentrations in the lung were assessed. The protein expression levels of Brg1, nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), and NAD(P)H:quinone oxidoreductase 1 (NQO1) in the lung were analyzed by Western blotting. RESULTS In the WT group, histopathological analysis revealed that lung damage peaked at 6 h after HIR. Meanwhile, the lung reactive oxygen species (ROS) and 8-isoprostane levels were significantly increased. The protein expression of Brg1 in lung tissue decreased to a minimum at 6 h. Overexpression of Brg1 alleviated lung injury and decreased the amounts of oxidative products, including the levels of 8-isoprostane and ROS, as well as the percentage of positive cells for 4-hydroxynonenal (4-HNE) and 8-oxo-2'-deoxyguanosine (8-OHdG). Brg1 overexpression increased the expression and nuclear translocation of Nrf2 as well as activated the antioxidases. In addition, it decreased the expression of inflammatory factors. CONCLUSION Overexpression of Brg1 alleviates oxidative lung injury induced by HIR, likely through the Nrf2 pathway.
Collapse
Affiliation(s)
- Mian Ge
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
| | - Chaojin Chen
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
| | - Weifeng Yao
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
| | - Shaoli Zhou
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
| | - Fei Huang
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
| | - Jun Cai
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
- *Jun Cai: and
| | - Ziqing Hei
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
- *Ziqing Hei:
| |
Collapse
|
25
|
Iglesias-Ara A, Zubiaga AM. The stress of coping with E2F loss. Mol Cell Oncol 2015; 3:e1038423. [PMID: 27308555 PMCID: PMC4845195 DOI: 10.1080/23723556.2015.1038423] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 04/01/2015] [Accepted: 04/02/2015] [Indexed: 11/10/2022]
Abstract
E2F transcription factors are key regulators of cellular proliferation, and altered E2F activity is a common feature of tumor cells. Thus, E2F targeting is being explored as a therapeutic strategy in cancer. Importantly, recent mouse knockout studies show that concomitant loss of E2f1/E2f2 activity is associated with increased genomic instability and oncogenic potential in normal differentiating cells, a finding that might have implications for cancer therapy.
Collapse
Affiliation(s)
- Ainhoa Iglesias-Ara
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU , Bilbao, Spain
| | - Ana M Zubiaga
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU , Bilbao, Spain
| |
Collapse
|