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Wang X, Liang C, Wang S, Ma Q, Pan X, Ran A, Qin C, Huang B, Yang F, Liu Y, Zhang Y, Ren J, Ning H, Li H, Jiang Y, Xiao B. RNA Binding Protein PTBP1 Promotes the Metastasis of Gastric Cancer by Stabilizing PGK1 mRNA. Cells 2024; 13:140. [PMID: 38247832 PMCID: PMC10814388 DOI: 10.3390/cells13020140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 12/31/2023] [Accepted: 01/09/2024] [Indexed: 01/23/2024] Open
Abstract
Gastric cancer (GC) is the most common type of malignant tumor within the gastrointestinal tract, and GC metastasis is associated with poor prognosis. Polypyrimidine tract binding protein 1 (PTBP1) is an RNA-binding protein implicated in various types of tumor development and metastasis. However, the role of PTBP1 in GC metastasis remains elusive. In this study, we verified that PTBP1 was upregulated in GC tissues and cell lines, and higher PTBP1 level was associated with poorer prognosis. It was shown that PTBP1 knockdown in vitro inhibited GC cell migration, whereas PTBP1 overexpression promoted the migration of GC cells. In vivo, the knockdown of PTBP1 notably reduced both the size and occurrence of metastatic nodules in a nude mice liver metastasis model. We identified phosphoglycerate kinase 1 (PGK1) as a downstream target of PTBP1 and found that PTBP1 increased the stability of PGK1 by directly binding to its mRNA. Furthermore, the PGK1/SNAIL axis could be required for PTBP1's function in the promotion of GC cell migration. These discoveries suggest that PTBP1 could be a promising therapeutic target for GC.
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Affiliation(s)
- Xiaolin Wang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Ce Liang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Shimin Wang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Qiang Ma
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Xiaojuan Pan
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Ai Ran
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Changhong Qin
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Bo Huang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563006, China
| | - Feifei Yang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Yuying Liu
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Yuying Zhang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Junwu Ren
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Hao Ning
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Haiping Li
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Yan Jiang
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
| | - Bin Xiao
- College of Pharmacy, Chongqing Medical University, Chongqing 400016, China; (X.W.); (C.L.); (S.W.); (Q.M.); (X.P.); (A.R.); (C.Q.); (B.H.); (F.Y.); (Y.L.); (Y.Z.); (J.R.); (H.N.); (H.L.); (Y.J.)
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Pirmoradi S, Hosseiniyan Khatibi SM, Zununi Vahed S, Homaei Rad H, Khamaneh AM, Akbarpour Z, Seyedrezazadeh E, Teshnehlab M, Chapman KR, Ansarin K. Unraveling the link between PTBP1 and severe asthma through machine learning and association rule mining method. Sci Rep 2023; 13:15399. [PMID: 37717070 PMCID: PMC10505163 DOI: 10.1038/s41598-023-42581-5] [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: 03/22/2023] [Accepted: 09/12/2023] [Indexed: 09/18/2023] Open
Abstract
Severe asthma is a chronic inflammatory airway disease with great therapeutic challenges. Understanding the genetic and molecular mechanisms of severe asthma may help identify therapeutic strategies for this complex condition. RNA expression data were analyzed using a combination of artificial intelligence methods to identify novel genes related to severe asthma. Through the ANOVA feature selection approach, 100 candidate genes were selected among 54,715 mRNAs in blood samples of patients with severe asthmatic and healthy groups. A deep learning model was used to validate the significance of the candidate genes. The accuracy, F1-score, AUC-ROC, and precision of the 100 genes were 83%, 0.86, 0.89, and 0.9, respectively. To discover hidden associations among selected genes, association rule mining was applied. The top 20 genes including the PTBP1, RAB11FIP3, APH1A, and MYD88 were recognized as the most frequent items among severe asthma association rules. The PTBP1 was found to be the most frequent gene associated with severe asthma among those 20 genes. PTBP1 was the gene most frequently associated with severe asthma among candidate genes. Identification of master genes involved in the initiation and development of asthma can offer novel targets for its diagnosis, prognosis, and targeted-signaling therapy.
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Affiliation(s)
- Saeed Pirmoradi
- Clinical Research Development Unit of Tabriz Valiasr Hospital, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Seyed Mahdi Hosseiniyan Khatibi
- Kidney Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Rahat Breath and Sleep Research Center, Tabriz University of Medical Science, Tabriz, Iran
| | | | - Hamed Homaei Rad
- Rahat Breath and Sleep Research Center, Tabriz University of Medical Science, Tabriz, Iran
| | - Amir Mahdi Khamaneh
- Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Zahra Akbarpour
- Rahat Breath and Sleep Research Center, Tabriz University of Medical Science, Tabriz, Iran
| | - Ensiyeh Seyedrezazadeh
- Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Teshnehlab
- Department of Electric and Computer Engineering, K.N. Toosi University of Technology, Tehran, Iran
| | - Kenneth R Chapman
- Division of Respiratory Medicine, Department of Medicine, University of Toronto, Toronto, ON, Canada.
| | - Khalil Ansarin
- Rahat Breath and Sleep Research Center, Tabriz University of Medical Science, Tabriz, Iran.
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Carico C, Placzek WJ. Reviewing PTBP1 Domain Modularity in the Pre-Genomic Era: A Foundation to Guide the Next Generation of Exploring PTBP1 Structure-Function Relationships. Int J Mol Sci 2023; 24:11218. [PMID: 37446395 DOI: 10.3390/ijms241311218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 06/28/2023] [Accepted: 07/06/2023] [Indexed: 07/15/2023] Open
Abstract
Polypyrimidine tract binding protein 1 (PTBP1) is one of the most well-described RNA binding proteins, known initially for its role as a splicing repressor before later studies revealed its numerous roles in RNA maturation, stability, and translation. While PTBP1's various biological roles have been well-described, it remains unclear how its four RNA recognition motif (RRM) domains coordinate these functions. The early PTBP1 literature saw extensive effort placed in detailing structures of each of PTBP1's RRMs, as well as their individual RNA sequence and structure preferences. However, limitations in high-throughput and high-resolution genomic approaches (i.e., next-generation sequencing had not yet been developed) precluded the functional translation of these findings into a mechanistic understanding of each RRM's contribution to overall PTBP1 function. With the emergence of new technologies, it is now feasible to begin elucidating the individual contributions of each RRM to PTBP1 biological functions. Here, we review all the known literature describing the apo and RNA bound structures of each of PTBP1's RRMs, as well as the emerging literature describing the dependence of specific RNA processing events on individual RRM domains. Our goal is to provide a framework of the structure-function context upon which to facilitate the interpretation of future studies interrogating the dynamics of PTBP1 function.
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Affiliation(s)
- Christine Carico
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - William J Placzek
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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Carico C, Cui J, Acton A, Placzek WJ. Polypyrimidine tract binding protein 1 (PTBP1) contains a novel regulatory sequence, the rBH3, that binds the pro-survival protein MCL1. J Biol Chem 2023:104778. [PMID: 37142223 DOI: 10.1016/j.jbc.2023.104778] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 04/25/2023] [Accepted: 04/27/2023] [Indexed: 05/06/2023] Open
Abstract
The maturation of RNA from its nascent transcription to ultimate utilization (e.g., translation, miR-mediated RNA silencing, etc.) involves an intricately coordinated series of biochemical reactions regulated by RNA binding proteins (RBPs). Over the past several decades, there has been extensive effort to elucidate the biological factors that control the specificity and selectivity of RNA target binding and downstream function. Polypyrimidine tract binding protein 1 (PTBP1) is an RBP that is involved in all steps of RNA maturation and serves as a key regulator of alternative splicing, and therefore understanding its regulation is of critical biologic importance. While several mechanisms of RBP specificity have been proposed (e.g., cell-specific expression of RBPs and secondary structure of target RNA), recently protein-protein interactions with individual domains of RBPs have been suggested to be important determinants of downstream function. Here we demonstrate a novel binding interaction between the first RNA recognition motif (RRM1) of PTBP1 and the pro-survival protein MCL1. Using both in silico and in vitro analyses, we demonstrate that MCL1 binds a novel regulatory sequence on RRM1, termed the rBH3. NMR spectroscopy reveals this interaction allosterically perturbs key residues in the RNA binding interface of RRM1 and negatively impacts RRM1 association with target RNA. Furthermore, pulldown of MCL1 by endogenous PTBP1 verifies that these proteins interact in an endogenous cellular environment, establishing the biological relevance of this binding event. Overall, our findings suggest a novel mechanism of regulation of PTBP1 in which a protein-protein interaction with a single RRM can impact RNA association.
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Affiliation(s)
- Christine Carico
- Department of Biochemistry and Molecular Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294
| | - Jia Cui
- Department of Biochemistry and Molecular Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294
| | - Alexus Acton
- Department of Biochemistry and Molecular Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294
| | - William J Placzek
- Department of Biochemistry and Molecular Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294.
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Duan L, Wang J, Zhang D, Yuan Y, Tang L, Zhou Y, Jiang X. Immune-Related miRNA-195-5p Inhibits the Progression of Lung Adenocarcinoma by Targeting Polypyrimidine Tract-Binding Protein 1. Front Oncol 2022; 12:862564. [PMID: 35600383 PMCID: PMC9117652 DOI: 10.3389/fonc.2022.862564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 04/07/2022] [Indexed: 11/13/2022] Open
Abstract
Purpose Lung adenocarcinoma (LUAD) is the most common type of cancer and the leading cause of cancer-related death worldwide, resulting in a huge economic and social burden. MiRNA-195-5p plays crucial roles in the initiation and progression of cancer. However, the significance of the miRNA-195-5p/polypyrimidine tract-binding protein 1 (miRNA-195-5p/PTBP1) axis in the progression of lung adenocarcinoma (LUAD) remains unclear. Methods Data were collected from The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) databases. The starBase database was employed to examine the expression of miRNA-195-5p, while the Kaplan–Meier plotter, UALCAN, and Gene Expression Profiling Interactive Analysis (GEPIA) databases were utilized to analyze the tumor stage and prognostic value of miRNA and PTBP1. Quantitative reverse transcription-polymerase chain reaction assay was conducted to detect the expression levels of miRNA-195-5p in LUAD cell lines and tissues. The effects of miRNA-195-5p on cell proliferation and migration were examined using the cell growth curve, clone information, transwell assays, and wound healing assays. Results We found that miRNA-195-5p was down-regulated in LUAD cancer and cell lines. Importantly, its low levels were related to the tumor stage, lymph node metastasis, and poor prognosis in LUAD. Overexpression of miR-195-5p significantly inhibited cell growth and migration promotes cell apoptosis. Further study revealed that PTBP1 is a target gene of miRNA-195-5p, and overexpression of miRNA-195-5p inhibited the progression of LUAD by inhibiting PTBP1 expression. MiRNA-195-5p expression was related to immune infiltration in lung adenocarcinoma. Moreover, PTBP1 was negatively correlated with diverse immune cell infiltration and drug sensitivity. Conclusion Our findings uncover a pivotal mechanism that miRNA-195-5p by modulate PTBP1 expression to inhibit the progression of LUAD. MiRNA-195-5p could be a novel diagnostic and prognostic molecular marker for LUAD.
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Affiliation(s)
- Lincan Duan
- Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Juan Wang
- Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Dahang Zhang
- Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Yixiao Yuan
- Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Lin Tang
- Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Yongchun Zhou
- Molecular Diagnostic Center, The Third Affiliated Hospital of Kunming Medical University, Kunming, China
- *Correspondence: Yongchun Zhou, ; Xiulin Jiang,
| | - Xiulin Jiang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Kunming, China
- *Correspondence: Yongchun Zhou, ; Xiulin Jiang,
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Wang H, Ma P, Liu P, Guo D, Liu Z, Zhang Z. lncRNA SNHG6 promotes hepatocellular carcinoma progression by interacting with HNRNPL/PTBP1 to facilitate SETD7/LZTFL1 mRNA destabilization. Cancer Lett 2021; 520:121-131. [PMID: 34252487 DOI: 10.1016/j.canlet.2021.07.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 07/01/2021] [Accepted: 07/06/2021] [Indexed: 01/03/2023]
Abstract
The lncRNA SNHG6 (small nucleolar RNA host gene 6) plays vital roles in tumorigenesis and the progression of hepatocellular carcinoma (HCC). However, the regulatory mechanisms of SNHG6 are largely unknown. In this study, we identified, via quantitative proteomics, specific cytoskeleton-associated proteins and enzyme modulators to be potential targets of SNHG6. SNHG6 reduced the mRNA levels of lysine methyltransferase, SET domain containing 7 (SETD7) and leucine zipper transcription factor-like 1 (LZTFL1) by posttranscriptional destabilization. Silencing of SETD7 or LZTFL1 reversed the suppressive effects of SNHG6 knockdown on HCC progression. Heterogeneous nuclear ribonucleoprotein L (HNRNPL) and polypyrimidine tract binding protein 1 (PTBP1) were identified as SNHG6-interacting proteins that bind to SETD7 or LZTFL1 mRNA. Forced expression of SNHG6 led to HNRNPL being competitively adsorbed by SNHG6, thereby removing its stabilizing effect on SETD7. Concurrently, the functional SNHG6-PTBP1 complex facilitated the degradation of LZTFL1 mRNA in hepatoma cells. These results indicated that SNHG6 promotes HCC progression by functioning as a "decoy plus guide" for HNRNPL and PTBP1 to facilitate mRNA decay of SETD7 and LZTFL1, thereby serving as a novel therapeutic target for HCC.
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Affiliation(s)
- Haitao Wang
- Department of Hepatobiliary and Pancreas, Research Center of Digestive Diseases, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Pei Ma
- Center for Gene Diagnosis, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China; Department of Forensic Medicine, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Pengpeng Liu
- Department of Hepatobiliary and Pancreas, Research Center of Digestive Diseases, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Deliang Guo
- Department of Hepatobiliary and Pancreas, Research Center of Digestive Diseases, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Zhisu Liu
- Department of Hepatobiliary and Pancreas, Research Center of Digestive Diseases, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China.
| | - Zhonglin Zhang
- Department of Hepatobiliary and Pancreas, Research Center of Digestive Diseases, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China.
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PTBP1-mediated regulation of AXL mRNA stability plays a role in lung tumorigenesis. Sci Rep 2019; 9:16922. [PMID: 31729427 PMCID: PMC6858377 DOI: 10.1038/s41598-019-53097-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 10/23/2019] [Indexed: 11/09/2022] Open
Abstract
AXL is expressed in many types of cancer and promotes cancer cell survival, metastasis and drug resistance. Here, we focus on identifying modulators that regulate AXL at the mRNA level. We have previously observed that the AXL promoter activity is inversely correlated with the AXL expression levels, suggesting that post-transcriptional mechanisms exist that down-regulate the expression of AXL mRNA. Here we show that the RNA binding protein PTBP1 (polypyrimidine tract-binding protein) directly targets the 5′-UTR of AXL mRNA in vitro and in vivo. Moreover, we also demonstrate that PTBP1, but not PTBP2, inhibits the expression of AXL mRNA and the RNA recognition motif 1 (RRM1) of PTBP1 is crucial for this interaction. To clarify how PTBP1 regulates AXL expression at the mRNA level, we found that, while the transcription rate of AXL was not significantly different, PTBP1 decreased the stability of AXL mRNA. In addition, over-expression of AXL may counteract the PTBP1-mediated apoptosis. Knock-down of PTBP1 expression could enhance tumor growth in animal models. Finally, PTBP1 was found to be negatively correlated with AXL expression in lung tumor tissues in Oncomine datasets and in tissue micro-array (TMA) analysis. In conclusion, we have identified a molecular mechanism of AXL expression regulation by PTBP1 through controlling the AXL mRNA stability. These findings may represent new thoughts alternative to current approaches that directly inhibit AXL signaling and may eventually help to develop novel therapeutics to avoid cancer metastasis and drug resistance.
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Wang ZN, Liu D, Yin B, Ju WY, Qiu HZ, Xiao Y, Chen YJ, Peng XZ, Lu CM. High expression of PTBP1 promote invasion of colorectal cancer by alternative splicing of cortactin. Oncotarget 2018; 8:36185-36202. [PMID: 28404950 PMCID: PMC5482648 DOI: 10.18632/oncotarget.15873] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 01/23/2017] [Indexed: 12/22/2022] Open
Abstract
Polypyrimidine tract-binding protein 1 (PTBP1) involving in almost all steps of mRNA regulation including alternative splicing metabolism during tumorigenesis due to its RNA-binding activity. Initially, we found that high expressed PTBP1 and poor prognosis was interrelated in colorectal cancer (CRC) patients with stages II and III CRC, which widely different in prognosis and treatment, by immunohistochemistry. PTBP1 was also upregulated in colon cancer cell lines. In our study, knockdown of PTBP1 by siRNA transfection decreased cell proliferation and invasion in vitro. Denovirus shRNA knockdown of PTBP1 inhibited colorectal cancer growth in vivo. Furthermore, PTBP1 regulates alternative splicing of many target genes involving in tumorgenesis in colon cancer cells. We confirmed that the splicing of cortactin exon 11 which was only contained in cortactin isoform-a, as a PTBP1 target. Knockdown of PTBP1 decreased the expression of cortactin isoform-a by exclusion of exon 11. Also the mRNA levels of PTBP1 and cortactin isoform-a were cooperatively expressed in colorectal cancer tissues. Knocking down cortactin isoform-a significantly decreased cell migration and invasion in colorectal cancer cells. Overexpression of cortactin isoform-a could rescue PTBP1-knockdown effect of cell motility. In summary the study revealed that PTBP1 facilitates colorectal cancer migration and invasion activities by inclusion of cortactin exon 11.
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Affiliation(s)
- Zhi-Na Wang
- Department of Gastroenteology and Hepatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Dan Liu
- Department of Gastroenteology and Hepatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China.,Department of Gastroenterology and Hepatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Bin Yin
- National Laboratory of Meidical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Wen-Yi Ju
- National Laboratory of Meidical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Hui-Zhong Qiu
- Department of General Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Yi Xiao
- Department of General Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Yuan-Jia Chen
- Department of Gastroenteology and Hepatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Xiao-Zhong Peng
- National Laboratory of Meidical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Chong-Mei Lu
- Department of Gastroenteology and Hepatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
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Shan H, Hou P, Zhang M, Li L, Pan Y, Chen F, Jiang T, Bai J, Zheng J. PTBP1 knockdown in renal cell carcinoma inhibits cell migration, invasion and angiogenesis in vitro and metastasis in vivo via the hypoxia inducible factor-1α pathway. Int J Oncol 2018; 52:1613-1622. [PMID: 29512730 DOI: 10.3892/ijo.2018.4296] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 02/27/2018] [Indexed: 11/05/2022] Open
Abstract
Polypyrimidine tract-binding protein 1 (PTBP1), a heterogeneous nuclear ribonucleoprotein, is a multi-functional RNA-binding protein. PTBP1 participates in a number of biological processes, including maintaining cell structure and motility, immunity, protein metabolism and the cell cycle. The present study aimed to investigate the association between PTBP1 expression and the prognosis and clinicopathological characteristics of patients with renal cell cancer (RCC). The potential mechanism of action of PTBP1 in the metastasis of RCC was also investigated. The results demonstrated that PTBP1 was overexpressed in RCC tissues compared with normal renal tissues. Furthermore, PTBP1 expression was negatively associated with patient prognosis and positively associated with tumor size, pathological tumor (pT) and pathological metastasis (pM) status and tumor lymph node metastasis (TNM) stage. PTBP1 knockdown in vitro inhibited RCC cell migration, invasion, proliferation and angiogenesis, and it was demonstrated that PTBP1 affected RCC cells primarily via the hypoxia inducible factor-1α pathway. Furthermore, PTBP1 knockdown decreased RCC lung metastasis in vivo. The present study demonstrated that PTBP1 knockdown suppresses tumor progression and metastasis, indicating that PTBP1 is an important prognostic factor in RCC and that it may be developed as a novel method of treating patients with RCC.
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Affiliation(s)
- Haixia Shan
- The Fourth Clinical College of Nanjing Medical University, Nanjing, Jiangsu 211100, P.R. China
| | - Pingfu Hou
- Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Meng Zhang
- Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Liantao Li
- Center of Clinical Oncology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Yu Pan
- Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Fang Chen
- Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Tao Jiang
- Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Jin Bai
- Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Junnian Zheng
- The Fourth Clinical College of Nanjing Medical University, Nanjing, Jiangsu 211100, P.R. China
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10
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Tseng KY, Chen YH, Lin S. Zinc finger protein ZFP36L1 promotes osteoblastic differentiation but represses adipogenic differentiation of mouse multipotent cells. Oncotarget 2017; 8:20588-20601. [PMID: 28206953 PMCID: PMC5400528 DOI: 10.18632/oncotarget.15246] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 11/09/2016] [Indexed: 12/21/2022] Open
Abstract
Zinc finger protein 36, C3H type-like 1 (ZFP36L1) is a member of the tristetraprolin (TTP) family and its role in the aging-related bone loss is currently unknown. We present evidence that ZFP36L1 expression in rat femurs and bone marrow mesenchymal stem cells (bmMSCs) was down-regulated with aging. ZFP36L1 knockdown decreased osteoblastic differentiation of MC3T3-E1 and C3H10T1/2 cells, and increased adipogenic differentiation of 3T3-L1 and C3H10T1/2 cells, whereas ZFP36L1 overexpression did the opposite. The finding that ZFP36L1 overexpression enhanced osteoblastic and repressed adipogenic differentiation was also corroborated by ex vivo experiments. Troglitazone prevented ZFP36L1 from inhibiting adipogenic differentiation, suggesting the significance of PPAR?2 repression in ZFP36L1s inhibitory effect on adipogenic differentiation. ZFP36L1 overexpression repressed the expression of Ppar?2 mRNA, but not the PPAR? promoter activity. Biotin pull-down and electrophoretic mobility-shift assays suggested that ZFP36L1 might interact with endogenous Ppar?2 mRNA by binding to its 3UTR. The ZFP36L1-containing ribonucleoprotein complexes of ZFP36L1-overexpressing cells contained less Ppar?2 mRNA than those of control cells. In a luciferase reporter construct, replacement of the SV40 poly(A) fragment by the 3UTR of Ppar?2 mRNA reduced the expression of luciferase transcripts in ZFP36L1-overexpressing cells. Examination of the kinetic expression of Ppar?2 mRNA after transcriptional blockage showed that ZFP36L1 might enhance the degradation of the transcripts. Together, these data imply that ZFP36L1 overexpression might repress adipogenesis at least by down-regulating PPAR?2 expression through post-transcriptional mechanisms. Thus, our findings support the notion that decrease of ZFP36L1 expression in bmMSCs with aging might contribute to the aging-related bone loss.
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Affiliation(s)
- Kuo-Yun Tseng
- Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan Town, Miaoli, Taiwan, Republic of China
| | - Yi-Hsuan Chen
- Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan Town, Miaoli, Taiwan, Republic of China
| | - Shankung Lin
- Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan Town, Miaoli, Taiwan, Republic of China.,Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan, Republic of China
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11
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Huang J, Zhang A, Ho TT, Zhang Z, Zhou N, Ding X, Zhang X, Xu M, Mo YY. Linc-RoR promotes c-Myc expression through hnRNP I and AUF1. Nucleic Acids Res 2015; 44:3059-69. [PMID: 26656491 PMCID: PMC4838338 DOI: 10.1093/nar/gkv1353] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Accepted: 11/19/2015] [Indexed: 01/05/2023] Open
Abstract
Linc-RoR was originally identified to be a regulator for induced pluripotent stem cells in humans and it has also been implicated in tumorigenesis. However, the underlying mechanism of Linc-RoR-mediated gene expression in cancer is poorly understood. The present study demonstrates that Linc-RoR plays an oncogenic role in part through regulation of c-Myc expression. Linc-RoR knockout (KO) suppresses cell proliferation and tumor growth. In particular, Linc-RoR KO causes a significant decrease in c-Myc whereas re-expression of Linc-RoR in the KO cells restores the level of c-Myc. Mechanistically, Linc-RoR interacts with heterogeneous nuclear ribonucleoprotein (hnRNP) I and AU-rich element RNA-binding protein 1 (AUF1), respectively, with an opposite consequence to their interaction with c-Myc mRNA. While Linc-RoR is required for hnRNP I to bind to c-Myc mRNA, interaction of Linc-RoR with AUF1 inhibits AUF1 to bind to c-Myc mRNA. As a result, Linc-RoR may contribute to the increased stability of c-Myc mRNA. Although hnRNP I and AUF1 can interact with many RNA species and regulate their functions, with involvement of Linc-RoR they would be able to selectively regulate mRNA stability of specific genes such as c-Myc. Together, these results support a role for Linc-RoR in c-Myc expression in part by specifically enhancing its mRNA stability, leading to cell proliferation and tumorigenesis.
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Affiliation(s)
- Jianguo Huang
- Cancer Institute, University of Mississippi Medical Center, Jackson, MS 39216, USA Department of Biochemistry, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Ali Zhang
- Division of Hematology/Oncology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Tsui-Ting Ho
- Cancer Institute, University of Mississippi Medical Center, Jackson, MS 39216, USA Department of Pharmacology/Toxicology, University of Mississippi Medical Center, Jackson, MS, USA
| | - Ziqiang Zhang
- Department of Respiration, Tongji Hospital affiliated to Tongji University, Shanghai, China
| | - Nanjiang Zhou
- Cancer Institute, University of Mississippi Medical Center, Jackson, MS 39216, USA Department of Biochemistry, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Xianfeng Ding
- Cancer Institute, University of Mississippi Medical Center, Jackson, MS 39216, USA College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, China
| | - Xu Zhang
- Center of Biostatistics and Bioinformatics, University of Mississippi Medical Center, Jackson, MS, USA
| | - Min Xu
- Department of Gastroenterology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Yin-Yuan Mo
- Cancer Institute, University of Mississippi Medical Center, Jackson, MS 39216, USA Department of Pharmacology/Toxicology, University of Mississippi Medical Center, Jackson, MS, USA
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12
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Liao SH, Liu WZ, Liu T, Sun Y, Feng X, Zhou HF. Potential signaling pathway of hypoxia-inducible factor in lung cancer and its gene polymorphism with lung cancer risk. J Recept Signal Transduct Res 2015; 35:233-7. [DOI: 10.3109/10799893.2015.1041648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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13
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Huang J, Zhou N, Watabe K, Lu Z, Wu F, Xu M, Mo YY. Long non-coding RNA UCA1 promotes breast tumor growth by suppression of p27 (Kip1). Cell Death Dis 2014; 5:e1008. [PMID: 24457952 PMCID: PMC4040676 DOI: 10.1038/cddis.2013.541] [Citation(s) in RCA: 307] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 11/26/2013] [Accepted: 12/04/2013] [Indexed: 01/09/2023]
Abstract
Functional genomics studies have led to the discovery of a large amount of non-coding RNAs from the human genome; among them are long non-coding RNAs (lncRNAs). Emerging evidence indicates that lncRNAs could have a critical role in the regulation of cellular processes such as cell growth and apoptosis as well as cancer progression and metastasis. As master gene regulators, lncRNAs are capable of forming lncRNA–protein (ribonucleoprotein) complexes to regulate a large number of genes. For example, lincRNA-RoR suppresses p53 in response to DNA damage through interaction with heterogeneous nuclear ribonucleoprotein I (hnRNP I). The present study demonstrates that hnRNP I can also form a functional ribonucleoprotein complex with lncRNA urothelial carcinoma-associated 1 (UCA1) and increase the UCA1 stability. Of interest, the phosphorylated form of hnRNP I, predominantly in the cytoplasm, is responsible for the interaction with UCA1. Moreover, although hnRNP I enhances the translation of p27 (Kip1) through interaction with the 5′-untranslated region (5′-UTR) of p27 mRNAs, the interaction of UCA1 with hnRNP I suppresses the p27 protein level by competitive inhibition. In support of this finding, UCA1 has an oncogenic role in breast cancer both in vitro and in vivo. Finally, we show a negative correlation between p27 and UCA in the breast tumor cancer tissue microarray. Together, our results suggest an important role of UCA1 in breast cancer.
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Affiliation(s)
- J Huang
- 1] Cancer Institute, University of Mississippi Medical Center, Jackson, MS, USA [2] Department of Biochemistry, University of Mississippi Medical Center, Jackson, MS, USA
| | - N Zhou
- 1] Cancer Institute, University of Mississippi Medical Center, Jackson, MS, USA [2] Department of Biochemistry, University of Mississippi Medical Center, Jackson, MS, USA
| | - K Watabe
- 1] Cancer Institute, University of Mississippi Medical Center, Jackson, MS, USA [2] Department of Microbiology, University of Mississippi Medical Center, Jackson, MS, USA
| | - Z Lu
- Department of Endocrinology, PLA General Hospital, Beijing, PR China
| | - F Wu
- System Biosciences, Mountain View, CA, USA
| | - M Xu
- Department of Gastroenterology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, PR China
| | - Y-Y Mo
- 1] Cancer Institute, University of Mississippi Medical Center, Jackson, MS, USA [2] Department of Pharmacology/Toxicology, University of Mississippi Medical Center, Jackson, MS, USA
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14
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New insights into functional roles of the polypyrimidine tract-binding protein. Int J Mol Sci 2013; 14:22906-32. [PMID: 24264039 PMCID: PMC3856098 DOI: 10.3390/ijms141122906] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 11/13/2013] [Accepted: 11/13/2013] [Indexed: 12/20/2022] Open
Abstract
Polypyrimidine Tract Binding Protein (PTB) is an intensely studied RNA binding protein involved in several post-transcriptional regulatory events of gene expression. Initially described as a pre-mRNA splicing regulator, PTB is now widely accepted as a multifunctional protein shuttling between nucleus and cytoplasm. Accordingly, PTB can interact with selected RNA targets, structural elements and proteins. There is increasing evidence that PTB and its paralog PTBP2 play a major role as repressors of alternatively spliced exons, whose transcription is tissue-regulated. In addition to alternative splicing, PTB is involved in almost all steps of mRNA metabolism, including polyadenylation, mRNA stability and initiation of protein translation. Furthermore, it is well established that PTB recruitment in internal ribosome entry site (IRES) activates the translation of picornaviral and cellular proteins. Detailed studies of the structural properties of PTB have contributed to our understanding of the mechanism of RNA binding by RNA Recognition Motif (RRM) domains. In the present review, we will describe the structural properties of PTB, its paralogs and co-factors, the role in post-transcriptional regulation and actions in cell differentiation and pathogenesis. Defining the multifunctional roles of PTB will contribute to the understanding of key regulatory events in gene expression.
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15
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Lin S, Wang MJ, Tseng KY. Polypyrimidine tract-binding protein induces p19(Ink4d) expression and inhibits the proliferation of H1299 cells. PLoS One 2013; 8:e58227. [PMID: 23536791 PMCID: PMC3594294 DOI: 10.1371/journal.pone.0058227] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 02/01/2013] [Indexed: 11/18/2022] Open
Abstract
The expression of polypyrimidine tract-binding protein (PTB) is up-regulated in many types of cancer. Here, we studied the role of PTB in the growth of non small cell lung cancer cells. Data showed that PTB overexpression inhibited the growth of H1299 cells at least by inhibiting DNA synthesis. Quantitative real-time PCR and Western blot analyses showed that PTB overexpression in H1299 cells specifically induced the expression of p19Ink4d, an inhibitor of cyclin-dependent kinase 4. Repression of p19Ink4d expression partially rescued PTB-caused proliferation inhibition. PTB overexpression also inhibited the growth and induced the expression of p19Ink4d mRNA in A549 cells. However, Western blot analyses failed to detect the presence of p19Ink4d protein in A549 cells. To address how PTB induced p19Ink4d in H1299 cells, we showed that PTB might up-regulate the activity of p19Ink4d gene (CDKN2D) promoter. Besides, PTB lacking the RNA recognition motif 3 (RRM3) was less effective in growth inhibition and p19Ink4d induction, suggesting that RNA-binding activity of PTB plays an important role in p19Ink4d induction. However, immunoprecipitation of ribonuclearprotein complexes plus quantitative real-time PCR analyses showed that PTB might not bind p19Ink4d mRNA, suggesting that PTB overexpression might trigger the other RNA-binding protein(s) to bind p19Ink4d mRNA. Subsequently, RNA electrophoretic mobility-shift assays revealed a 300-base segment (designated as B2) within the 3′UTR of p19Ink4d mRNA, with which the cytoplasmic lysates of PTB-overexpressing cells formed more prominent complexes than did control cell lysates. Insertion of B2 into a reporter construct increased the expression of the chimeric luciferase transcripts in transfected PTB-overexpressing cells but not in control cells; conversely, overexpression of B2-containing reporter construct in PTB-overexpressing cells abolished the induction of p19Ink4d mRNA. In sum, we have shown that PTB plays as a negative regulator in H1299 cell proliferation at least by inducing p19Ink4d expression at transcriptional and post-transcriptional levels.
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Affiliation(s)
- Shankung Lin
- Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan Town, Miaoli, Taiwan, Republic of China.
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16
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Tang X, Lucas JE, Chen JLY, LaMonte G, Wu J, Wang MC, Koumenis C, Chi JT. Functional interaction between responses to lactic acidosis and hypoxia regulates genomic transcriptional outputs. Cancer Res 2011; 72:491-502. [PMID: 22135092 DOI: 10.1158/0008-5472.can-11-2076] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Within solid tumor microenvironments, lactic acidosis, and hypoxia each have powerful effects on cancer pathophysiology. However, the influence that these processes exert on each other is unknown. Here, we report that a significant portion of the transcriptional response to hypoxia elicited in cancer cells is abolished by simultaneous exposure to lactic acidosis. In particular, lactic acidosis abolished stabilization of HIF-1α protein which occurs normally under hypoxic conditions. In contrast, lactic acidosis strongly synergized with hypoxia to activate the unfolded protein response (UPR) and an inflammatory response, displaying a strong similarity to ATF4-driven amino acid deprivation responses (AAR). In certain breast tumors and breast tumor cells examined, an integrative analysis of gene expression and array CGH data revealed DNA copy number alterations at the ATF4 locus, an important activator of the UPR/AAR pathway. In this setting, varying ATF4 levels influenced the survival of cells after exposure to hypoxia and lactic acidosis. Our findings reveal that the condition of lactic acidosis present in solid tumors inhibits canonical hypoxia responses and activates UPR and inflammation responses. Furthermore, these data suggest that ATF4 status may be a critical determinant of the ability of cancer cells to adapt to oxygen and acidity fluctuations in the tumor microenvironment, perhaps linking short-term transcriptional responses to long-term selection for copy number alterations in cancer cells.
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Affiliation(s)
- Xiaohu Tang
- Institute for Genome Sciences and Policy, Duke University, Durham, North Carolina, USA
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17
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Kim HJ, Oh JS, An SS, Pennant WA, Gwak SJ, Kim AN, Han PK, Yoon DH, Kim KN, Ha Y. Hypoxia-specific GM-CSF-overexpressing neural stem cells improve graft survival and functional recovery in spinal cord injury. Gene Ther 2011; 19:513-21. [DOI: 10.1038/gt.2011.137] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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18
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A SUMOylation-defective MITF germline mutation predisposes to melanoma and renal carcinoma. Nature 2011; 480:94-8. [PMID: 22012259 DOI: 10.1038/nature10539] [Citation(s) in RCA: 375] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 09/02/2011] [Indexed: 12/13/2022]
Abstract
So far, no common environmental and/or phenotypic factor has been associated with melanoma and renal cell carcinoma (RCC). The known risk factors for melanoma include sun exposure, pigmentation and nevus phenotypes; risk factors associated with RCC include smoking, obesity and hypertension. A recent study of coexisting melanoma and RCC in the same patients supports a genetic predisposition underlying the association between these two cancers. The microphthalmia-associated transcription factor (MITF) has been proposed to act as a melanoma oncogene; it also stimulates the transcription of hypoxia inducible factor (HIF1A), the pathway of which is targeted by kidney cancer susceptibility genes. We therefore proposed that MITF might have a role in conferring a genetic predisposition to co-occurring melanoma and RCC. Here we identify a germline missense substitution in MITF (Mi-E318K) that occurred at a significantly higher frequency in genetically enriched patients affected with melanoma, RCC or both cancers, when compared with controls. Overall, Mi-E318K carriers had a higher than fivefold increased risk of developing melanoma, RCC or both cancers. Codon 318 is located in a small-ubiquitin-like modifier (SUMO) consensus site (ΨKXE) and Mi-E318K severely impaired SUMOylation of MITF. Mi-E318K enhanced MITF protein binding to the HIF1A promoter and increased its transcriptional activity compared to wild-type MITF. Further, we observed a global increase in Mi-E318K-occupied loci. In an RCC cell line, gene expression profiling identified a Mi-E318K signature related to cell growth, proliferation and inflammation. Lastly, the mutant protein enhanced melanocytic and renal cell clonogenicity, migration and invasion, consistent with a gain-of-function role in tumorigenesis. Our data provide insights into the link between SUMOylation, transcription and cancer.
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