1
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Lu KP, Zhou XZ. Pin1-catalyzed conformational regulation after phosphorylation: A distinct checkpoint in cell signaling and drug discovery. Sci Signal 2024; 17:eadi8743. [PMID: 38889227 DOI: 10.1126/scisignal.adi8743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 05/30/2024] [Indexed: 06/20/2024]
Abstract
Protein phosphorylation is one of the most common mechanisms regulating cellular signaling pathways, and many kinases and phosphatases are proven drug targets. Upon phosphorylation, protein functions can be further regulated by the distinct isomerase Pin1 through cis-trans isomerization. Numerous protein targets and many important roles have now been elucidated for Pin1. However, no tools are available to detect or target cis and trans conformation events in cells. The development of Pin1 inhibitors and stereo- and phospho-specific antibodies has revealed that cis and trans conformations have distinct and often opposing cellular functions. Aberrant conformational changes due to the dysregulation of Pin1 can drive pathogenesis but can be effectively targeted in age-related diseases, including cancers and neurodegenerative disorders. Here, we review advances in understanding the roles of Pin1 signaling in health and disease and highlight conformational regulation as a distinct signal transduction checkpoint in disease development and treatment.
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Affiliation(s)
- Kun Ping Lu
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada
| | - Xiao Zhen Zhou
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada
- Department of Pathology and Laboratory Medicine, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada
- Lawson Health Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada
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2
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Jeong J, Usman M, Li Y, Zhou XZ, Lu KP. Pin1-Catalyzed Conformation Changes Regulate Protein Ubiquitination and Degradation. Cells 2024; 13:731. [PMID: 38727267 PMCID: PMC11083468 DOI: 10.3390/cells13090731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/12/2024] [Accepted: 04/14/2024] [Indexed: 05/13/2024] Open
Abstract
The unique prolyl isomerase Pin1 binds to and catalyzes cis-trans conformational changes of specific Ser/Thr-Pro motifs after phosphorylation, thereby playing a pivotal role in regulating the structure and function of its protein substrates. In particular, Pin1 activity regulates the affinity of a substrate for E3 ubiquitin ligases, thereby modulating the turnover of a subset of proteins and coordinating their activities after phosphorylation in both physiological and disease states. In this review, we highlight recent advancements in Pin1-regulated ubiquitination in the context of cancer and neurodegenerative disease. Specifically, Pin1 promotes cancer progression by increasing the stabilities of numerous oncoproteins and decreasing the stabilities of many tumor suppressors. Meanwhile, Pin1 plays a critical role in different neurodegenerative disorders via the regulation of protein turnover. Finally, we propose a novel therapeutic approach wherein the ubiquitin-proteasome system can be leveraged for therapy by targeting pathogenic intracellular targets for TRIM21-dependent degradation using stereospecific antibodies.
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Affiliation(s)
- Jessica Jeong
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5C1, Canada; (J.J.)
- Robarts Research Institute, Western University, London, ON N6A 5B7, Canada
| | - Muhammad Usman
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5C1, Canada; (J.J.)
- Robarts Research Institute, Western University, London, ON N6A 5B7, Canada
| | - Yitong Li
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5C1, Canada; (J.J.)
- Robarts Research Institute, Western University, London, ON N6A 5B7, Canada
| | - Xiao Zhen Zhou
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5C1, Canada; (J.J.)
- Department of Pathology and Laboratory Medicine, and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5C1, Canada
- Lawson Health Research Institute, Western University, London, ON N6C 2R5, Canada
| | - Kun Ping Lu
- Departments of Biochemistry and Oncology, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5C1, Canada; (J.J.)
- Robarts Research Institute, Western University, London, ON N6A 5B7, Canada
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3
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Wang P, Song Y, Li H, Zhuang J, Shen X, Yang W, Mi R, Lu Y, Yang B, Ma M, Shen H. SIRPA enhances osteosarcoma metastasis by stabilizing SP1 and promoting SLC7A3-mediated arginine uptake. Cancer Lett 2023; 576:216412. [PMID: 37769797 DOI: 10.1016/j.canlet.2023.216412] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 09/08/2023] [Accepted: 09/23/2023] [Indexed: 10/03/2023]
Abstract
The function of signal regulatory protein alpha (SIRPA) has been well studied in macrophages and dendritic cells, but relatively less in tumors. Notably, SIRPA is upregulated in osteosarcoma tissues, particularly in metastatic tissues, and is associated with unfavorable clinical outcomes. Knockdown of SIRPA impaired OS cell migration by decreasing specificity protein 1 (SP1) stability and arginine uptake. Importantly, SIRPA phosphorylated SP1 at threonine 278 (Thr278) through extracellular signal-regulated kinase (ERK) activation to protect SP1 from proteasomal degradation. In addition, SP1 increased solute carrier family 7 member 3 (SLC7A3) expression by binding to the SLC7A3 promoter and increased the capability of arginine uptake, thereby facilitating OS cell migration. More interestingly, arginine promoted the stability of SP1 in an ERK-independent manner and thus formed the "SP1 stabilization circle". Combined treatment with the anti-SIRPA antibody and arginase, which blocked the circle, impaired tumor metastasis in mice bearing xenografts formed from SIRPA-overexpressing cells. In summary, our study demonstrates that the upregulation of SIRPA promotes OS metastasis via the "SP1 stabilization circle" and SLC7A3-mediated arginine uptake, which might serve as a target for OS treatment.
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Affiliation(s)
- Peng Wang
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Yihui Song
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Hongyu Li
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Jiahao Zhuang
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Xin Shen
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Wen Yang
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Rujia Mi
- Center for Biotherapy, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Yixuan Lu
- Center for Biotherapy, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Biao Yang
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China
| | - Mengjun Ma
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China.
| | - Huiyong Shen
- Department of Orthopedics, The Eighth Affliated Hospital, Sun Yat-sen University, No. 3025 Shennan Zhong Road, Shenzhen, Guangdong, 518033, China.
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4
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Fei MY, Wang Y, Chang BH, Xue K, Dong F, Huang D, Li XY, Li ZJ, Hu CL, Liu P, Wu JC, Yu PC, Hong MH, Chen SB, Xu CH, Chen BY, Jiang YL, Liu N, Zhao C, Jin JC, Hou D, Chen XC, Ren YY, Deng CH, Zhang JY, Zong LJ, Wang RJ, Gao FF, Liu H, Zhang QL, Wu LY, Yan J, Shen S, Chang CK, Sun XJ, Wang L. The non-cell-autonomous function of ID1 promotes AML progression via ANGPTL7 from the microenvironment. Blood 2023; 142:903-917. [PMID: 37319434 PMCID: PMC10644073 DOI: 10.1182/blood.2022019537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 05/04/2023] [Accepted: 05/24/2023] [Indexed: 06/17/2023] Open
Abstract
The bone marrow microenvironment (BMM) can regulate leukemia stem cells (LSCs) via secreted factors. Increasing evidence suggests that dissecting the mechanisms by which the BMM maintains LSCs may lead to the development of effective therapies for the eradication of leukemia. Inhibitor of DNA binding 1 (ID1), a key transcriptional regulator in LSCs, previously identified by us, controls cytokine production in the BMM, but the role of ID1 in acute myeloid leukemia (AML) BMM remains obscure. Here, we report that ID1 is highly expressed in the BMM of patients with AML, especially in BM mesenchymal stem cells, and that the high expression of ID1 in the AML BMM is induced by BMP6, secreted from AML cells. Knocking out ID1 in mesenchymal cells significantly suppresses the proliferation of cocultured AML cells. Loss of Id1 in the BMM results in impaired AML progression in AML mouse models. Mechanistically, we found that Id1 deficiency significantly reduces SP1 protein levels in mesenchymal cells cocultured with AML cells. Using ID1-interactome analysis, we found that ID1 interacts with RNF4, an E3 ubiquitin ligase, and causes a decrease in SP1 ubiquitination. Disrupting the ID1-RNF4 interaction via truncation in mesenchymal cells significantly reduces SP1 protein levels and delays AML cell proliferation. We identify that the target of Sp1, Angptl7, is the primary differentially expression protein factor in Id1-deficient BM supernatant fluid to regulate AML progression in mice. Our study highlights the critical role of ID1 in the AML BMM and aids the development of therapeutic strategies for AML.
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Affiliation(s)
- Ming-Yue Fei
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, National Research Center for Translational Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yong Wang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Bin-He Chang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Kai Xue
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, National Research Center for Translational Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Fangyi Dong
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, National Research Center for Translational Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dan Huang
- Department of Hematology, Liaoning Medical Center for Hematopoietic Stem Cell Transplantation, Dalian Key Laboratory of Hematology, Liaoning Key Laboratory of Hematopoietic Stem Cell Transplantation and Translational Medicine, Diamond Bay Institute of Hematology, The Second Hospital of Dalian Medical University, Dalian, China
| | - Xi-Ya Li
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Zi-Juan Li
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Cheng-Long Hu
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ping Liu
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ji-Chuan Wu
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Peng-Cheng Yu
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ming-Hua Hong
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Shu-Bei Chen
- Department of Life Sciences and Biotechnology, Shanghai Jiao Tong University School of Life Sciences and Biotechnology, Shanghai, China
| | - Chun-Hui Xu
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Bing-Yi Chen
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yi-Lun Jiang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Na Liu
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Chong Zhao
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jia-Cheng Jin
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Dan Hou
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xin-Chi Chen
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yi-Yi Ren
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Chu-Han Deng
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Jia-Ying Zhang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Li-juan Zong
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Rou-Jia Wang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Fei-Fei Gao
- Department of Obstetrics and Gynecology, Shanghai Jiao Tong University Affiliated Eighth People’s Hospital, Shanghai, China
| | - Hui Liu
- Department of Hematology/Oncology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Key Laboratory of Pediatric Hematology and Oncology of China Ministry of Health, and National Children's Medical Center, Shanghai, China
| | - Qun-Ling Zhang
- Department of Lymphoma, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ling-Yun Wu
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Jinsong Yan
- Department of Hematology, Liaoning Medical Center for Hematopoietic Stem Cell Transplantation, Dalian Key Laboratory of Hematology, Liaoning Key Laboratory of Hematopoietic Stem Cell Transplantation and Translational Medicine, Diamond Bay Institute of Hematology, The Second Hospital of Dalian Medical University, Dalian, China
| | - Shuhong Shen
- Department of Hematology/Oncology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Key Laboratory of Pediatric Hematology and Oncology of China Ministry of Health, and National Children's Medical Center, Shanghai, China
| | - Chun-Kang Chang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Xiao-Jian Sun
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, National Research Center for Translational Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Life Sciences and Biotechnology, Shanghai Jiao Tong University School of Life Sciences and Biotechnology, Shanghai, China
| | - Lan Wang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
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5
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Wang Q, Bode AM, Zhang T. Targeting CDK1 in cancer: mechanisms and implications. NPJ Precis Oncol 2023; 7:58. [PMID: 37311884 DOI: 10.1038/s41698-023-00407-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/25/2023] [Indexed: 06/15/2023] Open
Abstract
Cyclin dependent kinases (CDKs) are serine/threonine kinases that are proposed as promising candidate targets for cancer treatment. These proteins complexed with cyclins play a critical role in cell cycle progression. Most CDKs demonstrate substantially higher expression in cancer tissues compared with normal tissues and, according to the TCGA database, correlate with survival rate in multiple cancer types. Deregulation of CDK1 has been shown to be closely associated with tumorigenesis. CDK1 activation plays a critical role in a wide range of cancer types; and CDK1 phosphorylation of its many substrates greatly influences their function in tumorigenesis. Enrichment of CDK1 interacting proteins with Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis was conducted to demonstrate that the associated proteins participate in multiple oncogenic pathways. This abundance of evidence clearly supports CDK1 as a promising target for cancer therapy. A number of small molecules targeting CDK1 or multiple CDKs have been developed and evaluated in preclinical studies. Notably, some of these small molecules have also been subjected to human clinical trials. This review evaluates the mechanisms and implications of targeting CDK1 in tumorigenesis and cancer therapy.
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Affiliation(s)
- Qiushi Wang
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN, 55912, USA
| | - Ann M Bode
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN, 55912, USA.
| | - Tianshun Zhang
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN, 55912, USA.
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6
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Inhibiting specificity protein 1 attenuated sevoflurane-induced mitochondrial stress and promoted autophagy in hippocampal neurons through PI3K/Akt/mTOR and α7-nAChR signaling. Neurosci Lett 2023; 794:136995. [PMID: 36464148 DOI: 10.1016/j.neulet.2022.136995] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/17/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022]
Abstract
Sevoflurane, a commonly used anesthetic in surgery, is considered as an inducer of neurodegenerative diseases and postoperative complications including postoperative cognitive dysfunction. Evidence showed that specificity protein 1 (SP1) participated in the regulation of various cellular processes. Also, SP1 was found to modulate sevoflurane-induced hippocampal inflammatory injury both in vitro and in vivo. Our study aimed to illustrate the role of SP1 in mediating mitochondrial stress and autophagy in neurons under sevoflurane exposure. SiRNA for SP1 was transfected in to hippocampus neurons for the loss-of-function assay before sevoflurane stimulation. Meanwhile, recilisib was utilized for PI3K/Akt/mTOR signaling activation, GTS-21 and MLA (methylycaconitine citrate) were used to activate or inactivate alpha 7 nicotinic acetylcholine receptor (α7-nAChR), respectively. Sevoflurane induced SP1 upregulation and autophagy suppression. Interfering SP1 dramatically depressed the promoted oxidative stress and mitochondrial dysfunction induced by sevoflurane. Additionally, SP1 silence blocked sevoflurane-induced activation of PI3K/Akt/mTOR signaling and inhibition of α7-nAChR. Restoring PI3K/Akt/mTOR signaling or depressing CAP significantly reversed the repressive effects of SP1 knockdown on mitochondrial stress and autophagy imbalance in hippocampal cells. In conclusions, our research indicated that SP1 regulated sevoflurane-induced oxidative stress dysregulation, mitochondrial function and cell autophagy in hippocampus via mediating the PI3K/Akt/mTOR and α7-nAChR pathways. Therefore, it might provide a novel sight for sevoflurane-induced hippocampus injury and POCD therapy.
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7
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Hyperglycemia induces gastric carcinoma proliferation and migration via the Pin1/BRD4 pathway. Cell Death Dis 2022; 8:224. [PMID: 35461311 PMCID: PMC9035156 DOI: 10.1038/s41420-022-01030-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 04/11/2022] [Accepted: 04/12/2022] [Indexed: 11/18/2022]
Abstract
Diabetes is a potential risk factor for gastric cancer (GC). Pin1, a peptidyl–prolyl cis/trans isomerase, promotes GC cell proliferation and migration. The role and underlying mechanism of the Pin1/BRD4 axis in hyperglycemia-induced proliferation and migration of GC cells were analyzed in vivo and in vitro. Proliferation and migration of GC cells were measured; Pin1 and BRD4 expression of the cell cycle were determined. Pin1 and BRD4 were downregulated by transfecting Pin1 shRNA lentivirus into GC cells and JQ1-intervention GC cells. Tumor formation and lung metastasis were assessed in vivo. Inhibition of Pin1 and BRD4 significantly suppressed high-glucose (HG)-induced GC cell proliferation and migration. HG enhanced G1/S cell-cycle transition, associated with increased Pin1 and BRD4 expression. Silencing Pin1 significantly downregulated the expression of BRD4 and NAP1L1 and upregulated that of P21 in GC cells. In vivo studies indicated that hyperglycemia promotes tumor growth and lung metastasis by inducing Pin1 and BRD4 expression. Thus, Pin1/BRD4 plays an important role in hyperglycemia-promoted tumor growth. The significance of these findings toward improved prognosis of diabetic patients with GC cannot be underestimated.
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8
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Liu HM, Tan HY, Lin Y, Xu BN, Zhao WH, Xie YA. MicroRNA-1271-5p inhibits cell proliferation and enhances radiosensitivity by targeting CDK1 in hepatocellular carcinoma. J Biochem 2021; 167:513-524. [PMID: 32275316 DOI: 10.1093/jb/mvz114] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 12/24/2019] [Indexed: 12/13/2022] Open
Abstract
This study aims to determine whether miR-1271-5p inhibits cell proliferation and enhances the radiosensitivity by targeting cyclin-dependent kinase 1 (CDK1) in hepatocellular carcinoma (HCC). Its expression levels in the HCC cell lines were significantly lower than those in normal human liver cell line. Bioinformatics analysis indicated CDK1 was a potential target of miR-1271-5p. Dual-Luciferase Reporter Assay confirmed that CDK1 is a direct target gene of miR-1271-5p. With overexpression of miR-1271-5p in SMMC-7721 and HuH-7 cells, cell proliferation was decreased, radiosensitivity was enhanced, cell cycle distribution was altered and the growth of transplanted tumours in nude mice was significantly reduced. miR-1271-5p overexpression enhanced radiosensitivity, which could be reduced by CDK1 overexpression. Overall, our findings suggested that miR-1271-5p inhibits cell proliferation and enhances the radiosensitivity of HCC cell lines by targeting CDK1.
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Affiliation(s)
- Hong-Mei Liu
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China.,Department of Radiation Oncology, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China
| | - Hua-Yan Tan
- Department of Radiation Oncology, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China
| | - Yue Lin
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China
| | - Bei-Ning Xu
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China
| | - Wen-Hua Zhao
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China
| | - Yu-An Xie
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University and Cancer Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China.,The Maternal & Health Hospital, The Children's Hospital, The Obstetrics & Gynecology Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, P.R. China
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9
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Yang JH, Wu MZ, Wang XB, Wang S, Qiu XS, Wang EH, Wu GP. HPV16 E6/E7 upregulate hTERC mRNA and gene amplification levels by relieving the effect of LKB1 on Sp1 phosphorylation in lung cancer cells. Ther Adv Med Oncol 2020; 12:1758835920917562. [PMID: 32499837 PMCID: PMC7243384 DOI: 10.1177/1758835920917562] [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: 01/22/2019] [Accepted: 03/04/2020] [Indexed: 11/18/2022] Open
Abstract
Background: There is an immediate need for research on the mechanism underlying
telomerase activation and overexpression. Materials & Methods: A total of 174 patients with lung cancer (n = 106) and
benign lung disease (n = 68) were recruited for the current
study. The mRNA expression levels of E6, E7, LKB1, Sp1, and hTERC in
brushing cells were detected by quantitative reverse transcriptase
polymerase chain reaction (qRT-PCR), and hTERC amplification was also
detected by fluorescence in situ hybridization (FISH). To investigate the
potential mechanism, bidirectional genetic manipulation was performed in
well-established lung cancer cell lines. Results: Our results indicated that the mRNA expression levels of E6, E7, Sp1, and
hTERC and the amplification level of hTERC were significantly increased in
the malignant group compared with those of the benign group
(p < 0.01). Conversely, the mRNA expression level of
LKB1 was significantly decreased in the malignant group
(p < 0.01). The correlation between E6, E7, Sp1, and
hTERC expression was positive but was negative with LKB1
(p < 0.01). Our results also showed that HPV16 E6/E7
downregulated the expression of LKB1 at both the protein and mRNA levels.
The loss of LKB1 upregulated Sp1 expression, and also promoted Sp1 activity.
Sp1 further upregulated hTERC at the mRNA and gene amplification levels.
Thus, we proposed a HPV–LKB1–Sp1–hTERC axis of E6/E7 upregulation of hTERC
expression. Conclusion: We demonstrated for the first time that E6 and E7 promoted hTERC mRNA
expression and the amplification of hTERC by relieving the effect of LKB1 on
the phosphorylation of Sp1. Sp1 further activated hTERC by directly binding
to the promoter regions of hTERC.
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Affiliation(s)
- Jing-Hua Yang
- Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - Ming-Zhe Wu
- Department of Gynecology, The First Hospital of China Medical University, Shenyang, China
| | - Xu-Bo Wang
- Department of Pathology, Xuzhou City Hospital of TCM, Nanjing University of Chinese Medicine, Xuzhou, China
| | - Shiyu Wang
- Geisinger Commonwealth School of Medicine, Scranton, PA, USA
| | - Xue-Shan Qiu
- Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - En-Hua Wang
- Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - Guang-Ping Wu
- Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, No.155 Nanjing Bei Street, Shenyang 110001, China
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10
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Makinwa Y, Musich PR, Zou Y. Phosphorylation-Dependent Pin1 Isomerization of ATR: Its Role in Regulating ATR's Anti-apoptotic Function at Mitochondria, and the Implications in Cancer. Front Cell Dev Biol 2020; 8:281. [PMID: 32426354 PMCID: PMC7203486 DOI: 10.3389/fcell.2020.00281] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 03/31/2020] [Indexed: 12/11/2022] Open
Abstract
Peptidyl-prolyl isomerization is an important post-translational modification of protein because proline is the only amino acid that can stably exist as cis and trans, while other amino acids are in the trans conformation in protein backbones. This makes prolyl isomerization a unique mechanism for cells to control many cellular processes. Isomerization is a rate-limiting process that requires a peptidyl-prolyl cis/trans isomerase (PPIase) to overcome the energy barrier between cis and trans isomeric forms. Pin1, a key PPIase in the cell, recognizes a phosphorylated Ser/Thr-Pro motif to catalyze peptidyl-prolyl isomerization in proteins. The significance of the phosphorylation-dependent Pin1 activity was recently highlighted for isomerization of ATR (ataxia telangiectasia- and Rad3-related). ATR, a PIKK protein kinase, plays a crucial role in DNA damage responses (DDR) by phosphorylating hundreds of proteins. ATR can form cis or trans isomers in the cytoplasm depending on Pin1 which isomerizes cis-ATR to trans-ATR. Trans-ATR functions primarily in the nucleus. The cis-ATR, containing an exposed BH3 domain, is anti-apoptotic at mitochondria by binding to tBid, preventing activation of pro-apoptotic Bax. Given the roles of apoptosis in many human diseases, particularly cancer, we propose that cytoplasmic cis-ATR enables cells to evade apoptosis, thus addicting cancer cells to cis-ATR formation for survival. But in normal DDR, a predominance of trans-ATR in the nucleus coordinates with a minimal level of cytoplasmic cis-ATR to promote DNA repair while preventing cell death; however, cells can die when DNA repair fails. Therefore, a delicate balance/equilibrium of the levels of cis- and trans-ATR is required to ensure the cellular homeostasis. In this review, we make a case that this anti-apoptotic role of cis-ATR supports oncogenesis, while Pin1 that drives the formation of trans-ATR suppresses tumor growth. We offer a potential, novel target that can be specifically targeted in cancer cells, without killing normal cells, to significantly reduce the adverse effects usually seen in cancer treatment. We also raise important issues regarding the roles of phosphorylation-dependent Pin1 isomerization of ATR in diseases and propose areas of future studies that would shed more understanding on this important cellular mechanism.
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Affiliation(s)
- Yetunde Makinwa
- Department of Cancer Biology, University of Toledo College of Medicine, Toledo, OH, United States
| | - Phillip R Musich
- Department of Biomedical Sciences, JH Quillen College of Medicine, East Tennessee State University, Johnson City, TN, United States
| | - Yue Zou
- Department of Cancer Biology, University of Toledo College of Medicine, Toledo, OH, United States.,Department of Biomedical Sciences, JH Quillen College of Medicine, East Tennessee State University, Johnson City, TN, United States
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11
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Hu X, Chen LF. Pinning Down the Transcription: A Role for Peptidyl-Prolyl cis-trans Isomerase Pin1 in Gene Expression. Front Cell Dev Biol 2020; 8:179. [PMID: 32266261 PMCID: PMC7100383 DOI: 10.3389/fcell.2020.00179] [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: 12/15/2019] [Accepted: 03/04/2020] [Indexed: 12/14/2022] Open
Abstract
Pin1 is a peptidyl-prolyl cis-trans isomerase that specifically binds to a phosphorylated serine or threonine residue preceding a proline (pSer/Thr-Pro) motif and catalyzes the cis-trans isomerization of proline imidic peptide bond, resulting in conformational change of its substrates. Pin1 regulates many biological processes and is also involved in the development of human diseases, like cancer and neurological diseases. Many Pin1 substrates are transcription factors and transcription regulators, including RNA polymerase II (RNAPII) and factors associated with transcription initiation, elongation, termination and post-transcription mRNA decay. By changing the stability, subcellular localization, protein-protein or protein-DNA/RNA interactions of these transcription related proteins, Pin1 modulates the transcription of many genes related to cell proliferation, differentiation, apoptosis and immune response. Here, we will discuss how Pin regulates the properties of these transcription relevant factors for effective gene expression and how Pin1-mediated transcription contributes to the diverse pathophysiological functions of Pin1.
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Affiliation(s)
- Xiangming Hu
- Fujian Key Laboratory for Translational Research in Cancer and Neurodegenerative Diseases, Institute for Translational Medicine, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Lin-Feng Chen
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL, United States.,Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
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12
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Lv L, Wang X. MicroRNA-296 Targets Specificity Protein 1 to Suppress Cell Proliferation and Invasion in Cervical Cancer. Oncol Res 2017; 26:775-783. [PMID: 29241478 PMCID: PMC7844729 DOI: 10.3727/096504017x15132494420120] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Cervical cancer is the third most commonly diagnosed malignancy and the fourth leading cause of cancer-related deaths in women worldwide. MicroRNA-296 (miR-296) is aberrantly expressed in a variety of human cancer types. However, the expression levels, biological roles, and underlying molecular mechanisms of miR-296 in cervical cancer remain unclear. This study aimed to detect miR-296 expression in cervical cancer and evaluate its roles and underlying mechanisms in cervical cancer. This study demonstrated that miR-296 was significantly downregulated in cervical cancer tissues and cell lines. Restoring the expression of miR-296 inhibited the proliferation and invasion of cervical cancer cells. Moreover, miR-296 directly targeted the 3'-untranslated regions of specificity protein 1 (SP1) and decreased its endogenous expression at both the mRNA and protein levels. Similar to induced miR-296 expression, SP1 knockdown suppressed the proliferation and invasion of cervical cancer cells. Besides, resumption expression of SP1 rescued the tumor-suppressing roles of miR-296 in cervical cancer. These results indicated that miR-296 may act as a tumor suppressor in cervical cancer by directly targeting SP1. Therefore, SP1 may be developed as a therapeutic target for the treatment of patients with this malignancy.
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Affiliation(s)
- Lili Lv
- Department of Oncology and Hematology, The Second Hospital of Jilin University, Changchun, Jilin, P.R. China
| | - Xiaodong Wang
- Department of Digestive Endoscopy, The Second Hospital of Jilin University, Changchun, Jilin, P.R. China
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13
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Chang KY, Hsu TI, Hsu CC, Tsai SY, Liu JJ, Chou SW, Liu MS, Liou JP, Ko CY, Chen KY, Hung JJ, Chang WC, Chuang CK, Kao TJ, Chuang JY. Specificity protein 1-modulated superoxide dismutase 2 enhances temozolomide resistance in glioblastoma, which is independent of O 6-methylguanine-DNA methyltransferase. Redox Biol 2017; 13:655-664. [PMID: 28822335 PMCID: PMC5561972 DOI: 10.1016/j.redox.2017.08.005] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 08/07/2017] [Indexed: 12/12/2022] Open
Abstract
Acquisition of temozolomide (TMZ) resistance is a major factor leading to the failure of glioblastoma (GBM) treatment. The exact mechanism by which GBM evades TMZ toxicity is not always related to the expression of the DNA repair enzyme O6-methylguanine-DNA methyltransferase (MGMT), and so remains unclear. In this study, TMZ-resistant variants derived from MGMT-negative GBM clinical samples and cell lines were studied, revealing there to be increased specificity protein 1 (Sp1) expression associated with reduced reactive oxygen species (ROS) accumulation following TMZ treatment. Analysis of gene expression databases along with cell studies identified the ROS scavenger superoxide dismutase 2 (SOD2) as being disease-related. SOD2 expression was also increased, and it was found to be co-expressed with Sp1 in TMZ-resistant cells. Investigation of the SOD2 promoter revealed Sp1 as a critical transcriptional activator that enhances SOD2 gene expression. Co-treatment with an Sp1 inhibitor restored the inhibitory effects of TMZ, and decreased SOD2 levels in TMZ-resistant cells. This treatment strategy restored susceptibility to TMZ in xenograft animals, leading to prolonged survival in an orthotopic model. Thus, our results suggest that Sp1 modulates ROS scavengers as a novel mechanism to increase cancer malignancy and resistance to chemotherapy. Inhibition of this pathway may represent a potential therapeutic target for restoring treatment susceptibility in GBM.
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Affiliation(s)
- Kwang-Yu Chang
- National Institute of Cancer Research, National Health Research Institutes, Taiwan; Department of Internal Medicine, National Cheng Kung University Hospital, Taiwan
| | - Tsung-I Hsu
- Center for Neurotrauma and Neuroregeneration, Taipei Medical University, Taiwan
| | - Che-Chia Hsu
- Graduate Institute of Medical Science, Taipei Medical University, Taiwan; Department of Cancer Biology, Wake Forest School of Medicine, USA
| | | | - Jr-Jiun Liu
- National Institute of Cancer Research, National Health Research Institutes, Taiwan; The Ph.D. Program for Neural Regenerative Medicine, Taipei Medical University, Taiwan
| | - Shao-Wen Chou
- National Institute of Cancer Research, National Health Research Institutes, Taiwan
| | - Ming-Sheng Liu
- National Institute of Cancer Research, National Health Research Institutes, Taiwan
| | | | - Chiung-Yuan Ko
- The Ph.D. Program for Neural Regenerative Medicine, Taipei Medical University, Taiwan
| | - Kai-Yun Chen
- The Ph.D. Program for Neural Regenerative Medicine, Taipei Medical University, Taiwan
| | - Jan-Jong Hung
- Institute of Bioinformatics and Biosignal Transduction, National Cheng Kung University, Taiwan
| | - Wen-Chang Chang
- Graduate Institute of Medical Science, Taipei Medical University, Taiwan
| | - Cheng-Keng Chuang
- Department of Medicine, Chang Gung University, Taiwan; Department of Urology, Linkou Chang Gung Memorial Hospital, Taiwan
| | - Tzu-Jen Kao
- Center for Neurotrauma and Neuroregeneration, Taipei Medical University, Taiwan; The Ph.D. Program for Neural Regenerative Medicine, Taipei Medical University, Taiwan.
| | - Jian-Ying Chuang
- Center for Neurotrauma and Neuroregeneration, Taipei Medical University, Taiwan; The Ph.D. Program for Neural Regenerative Medicine, Taipei Medical University, Taiwan.
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14
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Yuan DY, Meng Z, Xu K, Li QF, Chen C, Li KY, Zhang B. Betulinic acid increases radiosensitization of oral squamous cell carcinoma through inducing Sp1 sumoylation and PTEN expression. Oncol Rep 2017; 38:2360-2368. [DOI: 10.3892/or.2017.5872] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 06/02/2017] [Indexed: 11/05/2022] Open
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15
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Vázquez-Martínez ER, Camacho-Arroyo I, Zarain-Herzberg A, Rodríguez MC, Mendoza-Garcés L, Ostrosky-Wegman P, Cerbón M. Estradiol differentially induces progesterone receptor isoforms expression through alternative promoter regulation in a mouse embryonic hypothalamic cell line. Endocrine 2016; 52:618-31. [PMID: 26676302 DOI: 10.1007/s12020-015-0825-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 11/29/2015] [Indexed: 10/22/2022]
Abstract
Progesterone receptor (PR) presents two main isoforms (PR-A and PR-B) that are regulated by two specific promoters and transcribed from alternative transcriptional start sites. The molecular regulation of PR isoforms expression in embryonic hypothalamus is poorly understood. The aim of the present study was to assess estradiol regulation of PR isoforms in a mouse embryonic hypothalamic cell line (mHypoE-N42), as well as the transcriptional status of their promoters. MHypoE-N42 cells were treated with estradiol for 6 and 12 h. Then, Western blot, real-time quantitative reverse transcription polymerase chain reaction, and chromatin and DNA immunoprecipitation experiments were performed. PR-B expression was transiently induced by estradiol after 6 h of treatment in an estrogen receptor alpha (ERα)-dependent manner. This induction was associated with an increase in ERα phosphorylation (serine 118) and its recruitment to PR-B promoter. After 12 h of estradiol exposure, a downregulation of this PR isoform was associated with a decrease of specific protein 1, histone 3 lysine 4 trimethylation, and RNA polymerase II occupancy on PR-B promoter, without changes in DNA methylation and hydroxymethylation. In contrast, there were no estradiol-dependent changes in PR-A expression that could be related with the epigenetic marks or the transcription factors evaluated. We demonstrate that PR isoforms are differentially regulated by estradiol and that the induction of PR-B expression is associated to specific transcription factors interactions and epigenetic changes in its promoter in embryonic hypothalamic cells.
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Affiliation(s)
- Edgar Ricardo Vázquez-Martínez
- Unidad de Investigación en Reproducción Humana, Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Av. Universidad 3000, Coyoacán, 04510, Mexico, DF, Mexico
| | - Ignacio Camacho-Arroyo
- Unidad de Investigación en Reproducción Humana, Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Av. Universidad 3000, Coyoacán, 04510, Mexico, DF, Mexico
| | | | | | | | - Patricia Ostrosky-Wegman
- Departamento de Medicina Genómica y Toxicología Ambiental, Instituto de Investigaciones Biomédicas, UNAM, Mexico, Mexico
| | - Marco Cerbón
- Unidad de Investigación en Reproducción Humana, Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Av. Universidad 3000, Coyoacán, 04510, Mexico, DF, Mexico.
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16
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Zhang X, Li M, Wu X, Pan C, Lei C, Chen H, Lan X. Novel splice isoforms of dairy goat DBC1 and their diverse mRNA expression profiles. Small Rumin Res 2015. [DOI: 10.1016/j.smallrumres.2015.07.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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17
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Vizcaíno C, Mansilla S, Portugal J. Sp1 transcription factor: A long-standing target in cancer chemotherapy. Pharmacol Ther 2015; 152:111-24. [PMID: 25960131 DOI: 10.1016/j.pharmthera.2015.05.008] [Citation(s) in RCA: 272] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 05/04/2015] [Indexed: 11/25/2022]
Abstract
Sp1 (specificity protein 1) is a well-known member of a family of transcription factors that also includes Sp2, Sp3 and Sp4, which are implicated in an ample variety of essential biological processes and have been proven important in cell growth, differentiation, apoptosis and carcinogenesis. Sp1 activates the transcription of many cellular genes that contain putative CG-rich Sp-binding sites in their promoters. Sp1 and Sp3 proteins bind to similar, if not the same, DNA tracts and compete for binding, thus they can enhance or repress gene expression. Evidences exist that the Sp-family of proteins regulates the expression of genes that play pivotal roles in cell proliferation and metastasis of various tumors. In patients with a variety of cancers, high levels of Sp1 protein are considered a negative prognostic factor. A plethora of compounds can interfere with the trans-activating activities of Sp1 and other Sp proteins on gene expression. Several pathways are involved in the down-regulation of Sp proteins by compounds with different mechanisms of action, which include not only the direct interference with the binding of Sp proteins to their putative DNA binding sites, but also promoting the degradation of Sp protein factors. Down-regulation of Sp transcription factors and Sp1-regulated genes is drug-dependent and it is determined by the cell context. The acknowledgment that several of those compounds are safe enough might accelerate their introduction into clinical usage in patients with tumors that over-express Sp1.
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Affiliation(s)
- Carolina Vizcaíno
- Instituto de Biología Molecular de Barcelona, CSIC, Parc Científic de Barcelona, E-08028 Barcelona, Spain
| | - Sylvia Mansilla
- Instituto de Biología Molecular de Barcelona, CSIC, Parc Científic de Barcelona, E-08028 Barcelona, Spain
| | - José Portugal
- Instituto de Biología Molecular de Barcelona, CSIC, Parc Científic de Barcelona, E-08028 Barcelona, Spain.
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18
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Li R, Xiao J, Qing X, Xing J, Xia Y, Qi J, Liu X, Zhang S, Sheng X, Zhang X, Ji X. Sp1 Mediates a Therapeutic Role of MiR-7a/b in Angiotensin II-Induced Cardiac Fibrosis via Mechanism Involving the TGF-β and MAPKs Pathways in Cardiac Fibroblasts. PLoS One 2015; 10:e0125513. [PMID: 25923922 PMCID: PMC4414609 DOI: 10.1371/journal.pone.0125513] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 03/12/2015] [Indexed: 12/15/2022] Open
Abstract
MicroRNA-7a/b (miR-7a/b) protects cardiac myocytes from apoptosis during ischemia/reperfusion injury; however, its role in angiotensin II (ANG II)-stimulated cardiac fibroblasts (CFs) remains unknown. Therefore, the present study investigated the anti-fibrotic mechanism of miR-7a/b in ANG II-treated CFs. ANG II stimulated the expression of specific protein 1 (Sp1) and collagen I in a dose- and time-dependent manner, and the overexpression of miR-7a/b significantly down-regulated the expression of Sp1 and collagen I stimulated by ANG II (100 nM) for 24 h. miR-7a/b overexpression effectively inhibited MMP-2 expression/activity and MMP-9 expression, as well as CF proliferation and migration. In addition, miR-7a/b also repressed the activation of TGF-β, ERK, JNK and p38 by ANG II. The inhibition of Sp1 binding activity by mithramycin prevented collagen I overproduction; however, miR-7a/b down-regulation reversed this effect. Further studies revealed that Sp1 also mediated miR-7a/b-regulated MMP expression and CF migration, as well as TGF-β and ERK activation. In conclusion, miR-7a/b has an anti-fibrotic role in ANG II-treated CFs that is mediated by Sp1 mechanism involving the TGF-β and MAPKs pathways.
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Affiliation(s)
- Rui Li
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Jie Xiao
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Xiaoteng Qing
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Junhui Xing
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - Yanfei Xia
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Jia Qi
- Department of Cardiology, Central Hospital of Zibo, Shandong, China
| | - Xiaojun Liu
- Department of Cardiology, Central Hospital of Zibo, Shandong, China
| | - Sen Zhang
- Department of Cardiology, Qilu Hospital of Shandong University, Qingdao, Shandong, China
| | - Xi Sheng
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Xinyu Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Xiaoping Ji
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Qilu Hospital of Shandong University, Jinan, Shandong, China
- * E-mail:
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Regulators of carcinogenesis: emerging roles beyond their primary functions. Cancer Lett 2014; 357:75-82. [PMID: 25448403 DOI: 10.1016/j.canlet.2014.11.048] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Revised: 11/23/2014] [Accepted: 11/24/2014] [Indexed: 12/20/2022]
Abstract
Cancers are characterized by aberrant cell signaling that results in accelerated proliferation, suppressed cell death, and reprogrammed metabolism to provide sufficient energy and intermediate metabolites for macromolecular biosynthesis. Here, we summarize the emerging "unconventional" roles of these regulators based on their newly identified interaction partners, different subcellular localizations, and/or structural variants. For example, the epidermal growth factor receptor (EGFR) regulates DNA synthesis, microRNA maturation and drug resistance by interacting with previously undescribed partners; cyclins and cyclin-dependent kinases (CDKs) crosstalk with multiple canonical pathways by phosphorylating novel substrates or by functioning as transcriptional factors; apoptosis executioners play extensive roles in necroptosis, autophagy, and in the self-renewal of stem cells; and various metabolic enzymes and their mutants control carcinogenesis independently of their enzymatic activity. These recent findings will supplement the systemic functional annotation of cancer regulators and provide new rationales for potential molecular targeted cancer treatments.
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