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Tang XE, Cheng YQ, Tang CK. Protein tyrosine phosphatase non-receptor type 2 as the therapeutic target of atherosclerotic diseases: past, present and future. Front Pharmacol 2023; 14:1219690. [PMID: 37670950 PMCID: PMC10475599 DOI: 10.3389/fphar.2023.1219690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/03/2023] [Indexed: 09/07/2023] Open
Abstract
Tyrosine-protein phosphatase non-receptor type 2(PTPN2), an important member of the protein tyrosine phosphatase family, can regulate various signaling pathways and biological processes by dephosphorylating receptor protein tyrosine kinases. Accumulating evidence has demonstrated that PTPN2 is involved in the occurrence and development of atherosclerotic cardiovascular disease. Recently, it has been reported that PTPN2 exerts an anti-atherosclerotic effect by regulating vascular endothelial injury, monocyte proliferation and migration, macrophage polarization, T cell polarization, autophagy, pyroptosis, and insulin resistance. In this review, we summarize the latest findings on the role of PTPN2 in the pathogenesis of atherosclerosis to provide a rationale for better future research and therapeutic interventions.
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Affiliation(s)
- Xiao-Er Tang
- Department of Pathophysiology, Shaoyang University, Shaoyang, Hunan, China
| | - Ya-Qiong Cheng
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan, China
| | - Chao-Ke Tang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan, China
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2
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Shao J, Shi T, Chen L, Wang X, Yu H, Feng N, Wang X. AF9 targets acetyl-modified STAT6 to diminish purine metabolism and accelerate cell apoptosis during metastasis. Cell Death Differ 2023:10.1038/s41418-023-01172-7. [PMID: 37308587 DOI: 10.1038/s41418-023-01172-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 04/14/2023] [Accepted: 04/25/2023] [Indexed: 06/14/2023] Open
Abstract
Cell migration and invasion are two important steps for tumour metastasis, and involved the behaviors including metabolism remodeling and anti-apoptosis. However, it's still elusive that cancer cells how to antagonize apoptosis during tumour metastasis. In this study, we observed that super elongation complex (SEC) subunit AF9 depletion exacerbated cell migration and invasion but reduced the apoptosis during invasive migration. Mechanically, AF9 targeted acetyl (Ac)-STAT6 at lysine (K) 284 and blocked STAT6 transactivation on the promoter of such genes involved in regulating purine metabolism and metastasis, in turn induced apoptosis of suspended cells. Of note, AcSTAT6-K284 was not induced by IL4 signaling but decreased by limited nutrition which triggered SIRT6 to remove acetyl group at STAT6-K284. The functional experiments proved that AcSTAT6-K284 attenuated cell migration and invasion depending on AF9 expression level. Animal metastatic study further confirmed the AF9/AcSTAT6-K284 axis existed and blocked kidney renal clear cell carcinoma (KIRC) metastasis. In clinical, both AF9 expression and AcSTAT6-K284 were decreased accompanied by the advanced tumour grade and positively correlated with KIRC patients' survival. Conclusively, we explored an inhibitory axis which not only suppressed tumour metastasis but also could be utilized for drug development to hamper KIRC metastasis.
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Affiliation(s)
- Jialiang Shao
- Department of Urology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai, 200080, China
| | - Tiezhu Shi
- School of Life Sciences, Guangzhou University, Guangzhou, 510006, China
| | - Lianheng Chen
- School of Life Sciences, Guangzhou University, Guangzhou, 510006, China
| | - Xiang Wang
- Department of Urology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai, 200080, China
| | - Hua Yu
- School of Life Sciences, Guangzhou University, Guangzhou, 510006, China.
| | - Ninghan Feng
- Department of Urology, The Affiliated Wuxi No.2 Hospital of Nanjing Medical University, Jiangsu, 214002, China.
| | - Xiongjun Wang
- School of Life Sciences, Guangzhou University, Guangzhou, 510006, China.
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3
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Larkin R, Hermsen MA, London NR. Translocations and Gene Fusions in Sinonasal Malignancies. Curr Oncol Rep 2023; 25:269-278. [PMID: 36753024 PMCID: PMC10316133 DOI: 10.1007/s11912-023-01364-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2022] [Indexed: 02/09/2023]
Abstract
PURPOSE OF REVIEW During the past few years there has been an expansion in our understanding of gene fusions and translocations involved in cancer of the sinonasal tract. Here we review the downstream biologic effects, clinical characteristics, and pathologic features of these tumors. The molecular consequences and neo-antigens resulting from these chromosomal aberrations are considered and targets for current and future clinical trials discussed. RECENT FINDINGS Several new, clinically relevant, chromosomal aberrations have been discovered and evaluated to varying degrees in sinonasal tumors including DEK::AFF2, BRD4::NUT, ADCK4::NUMBL, and ETV6::NTRK3. Sinonasal malignancies demonstrate a diverse genetic landscape and varying clinical courses. Recent studies illustrate that gene fusions and translocations may play a role in carcinogenesis in certain sinonasal tumor subtypes and may be used to develop new biomarker-driven and patient-centered treatments.
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Affiliation(s)
- Riley Larkin
- Sinonasal and Skull Base Tumor Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
- Department of Otolaryngology-Head and Neck Surgery, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Mario A Hermsen
- Department of Head and Neck Cancer, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain
| | - Nyall R London
- Sinonasal and Skull Base Tumor Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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4
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Nguyen Huu T, Park J, Zhang Y, Duong Thanh H, Park I, Choi JM, Yoon HJ, Park SC, Woo HA, Lee SR. The Role of Oxidative Inactivation of Phosphatase PTEN and TCPTP in Fatty Liver Disease. Antioxidants (Basel) 2023; 12:antiox12010120. [PMID: 36670982 PMCID: PMC9854873 DOI: 10.3390/antiox12010120] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/29/2022] [Accepted: 12/30/2022] [Indexed: 01/05/2023] Open
Abstract
Alcoholic liver disease (ALD) and nonalcoholic fatty liver disease (NAFLD) are becoming increasingly prevalent worldwide. Despite the different etiologies, their spectra and histological feature are similar, from simple steatosis to more advanced stages such as steatohepatitis, fibrosis, cirrhosis, and hepatocellular carcinoma. Studies including peroxiredoxin knockout models revealed that oxidative stress is crucial in these diseases, which present as consequences of redox imbalance. Protein tyrosine phosphatases (PTPs) are a superfamily of enzymes that are major targets of reactive oxygen species (ROS) because of an oxidation-susceptible nucleophilic cysteine in their active site. Herein, we review the oxidative inactivation of two tumor suppressor PTPs, phosphatase and tensin homolog deleted on chromosome 10 (PTEN) and T-cell protein tyrosine phosphatase (TCPTP), and their contribution to the pathogenicity of ALD and NAFLD, respectively. This review might provide a better understanding of the pathogenic mechanisms of these diseases and help develop new therapeutic strategies to treat fatty liver disease.
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Affiliation(s)
- Thang Nguyen Huu
- Department of Biochemistry, Department of Biomedical Sciences, Research Center for Aging and Geriatrics, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
- BioMedical Sciences Graduate Program (BMSGP), Chonnam National University Medical School, Hwasun 58 128, Republic of Korea
| | - Jiyoung Park
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Ying Zhang
- Department of Cell Biology, School of Medicine, Jiangsu University, Zhenjiang 212013, China
| | - Hien Duong Thanh
- BioMedical Sciences Graduate Program (BMSGP), Chonnam National University Medical School, Hwasun 58 128, Republic of Korea
- Department of Anatomy, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
| | - Iha Park
- Department of Biochemistry, Department of Biomedical Sciences, Research Center for Aging and Geriatrics, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
| | - Jin Myung Choi
- Department of Biochemistry, Department of Biomedical Sciences, Research Center for Aging and Geriatrics, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
| | - Hyun Joong Yoon
- Department of Biochemistry, Department of Biomedical Sciences, Research Center for Aging and Geriatrics, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
| | - Sang Chul Park
- The Future Life and Society Research Center, Advanced Institute of Aging Science, Chonnam National University, Gwangju 61469, Republic of Korea
| | - Hyun Ae Woo
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Seung-Rock Lee
- Department of Biochemistry, Department of Biomedical Sciences, Research Center for Aging and Geriatrics, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
- Correspondence: ; Tel.: +82-61-379-2775; Fax: +82-61-379-2782
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5
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Zhou W, Xu Y, Zhang J, Zhang P, Yao Z, Yan Z, Wang H, Chu J, Yao S, Zhao S, Yang S, Guo Y, Miao J, Liu K, Chan WC, Xia Q, Liu Y. MiRNA-363-3p/DUSP10/JNK axis mediates chemoresistance by enhancing DNA damage repair in diffuse large B-cell lymphoma. Leukemia 2022; 36:1861-1869. [PMID: 35488020 PMCID: PMC9252898 DOI: 10.1038/s41375-022-01565-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 03/25/2022] [Accepted: 03/31/2022] [Indexed: 12/11/2022]
Abstract
Anthracycline-based chemotherapy resistance represents a major challenge in diffuse large B-cell lymphoma (DLBCL). MiRNA and gene expression profiles (n = 47) were determined to uncover potential chemoresistance mechanisms and therapeutic approaches. An independent correlation between high expression of miRNA-363-3p and chemoresistance was observed and validated in a larger cohort (n = 106). MiRNA-363-3p was shown to reduce doxorubicin-induced apoptosis and tumor shrinkage in in vitro and in vivo experiments by ectopic expression and CRISPR/Cas9-mediated knockout in DLBCL cell lines. DNA methylation was found to participate in transcriptional regulation of miRNA-363-3p. Further investigation revealed that dual specificity phosphatase 10 (DUSP10) is a target of miRNA-363-3p and its suppression promotes the phosphorylation of c-Jun N-terminal kinase (JNK). The miRNA-363-3p/DUSP10/JNK axis was predominantly associated with negative regulation of homologous recombination (HR) and DNA repair pathways. Ectopic expression of miRNA-363-3p more effectively repaired doxorubicin-induced double-strand break (DSB) while enhancing non-homologous end joining repair and reducing HR repair. Targeting JNK and poly (ADP-ribose) polymerase 1 significantly inhibited doxorubicin-induced DSB repair, increased doxorubicin-induced cell apoptosis and tumor shrinkage, and improved the survival of tumor-bearing mice. In conclusion, the miRNA-363-3p/DUSP10/JNK axis is a novel chemoresistance mechanism in DLBCL that may be reversed by targeted therapy.
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Affiliation(s)
- Wenping Zhou
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China.,Department of Lymphoma Research, Henan Cancer Institute, Zhengzhou, Henan, China
| | - Yuanlin Xu
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Jiuyang Zhang
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Peipei Zhang
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China.,Department of Lymphoma Research, Henan Cancer Institute, Zhengzhou, Henan, China
| | - Zhihua Yao
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Zheng Yan
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Haiying Wang
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Junfeng Chu
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Shuna Yao
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Shuang Zhao
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Shujun Yang
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Yongjun Guo
- Department of Molecule and Pathology, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China
| | - Jinxin Miao
- Academy of Chinese Medical Sciences, Henan University of Chinese Medicine, Zhengzhou, Henan, China
| | - Kangdong Liu
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China
| | - Wing C Chan
- Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA
| | - Qingxin Xia
- Department of Molecule and Pathology, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China.
| | - Yanyan Liu
- Department of Internal Medicine, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, Henan, China. .,Department of Lymphoma Research, Henan Cancer Institute, Zhengzhou, Henan, China.
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6
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The catalytic activity of TCPTP is auto-regulated by its intrinsically disordered tail and activated by Integrin alpha-1. Nat Commun 2022; 13:94. [PMID: 35013194 PMCID: PMC8748766 DOI: 10.1038/s41467-021-27633-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/29/2021] [Indexed: 11/08/2022] Open
Abstract
T-Cell Protein Tyrosine Phosphatase (TCPTP, PTPN2) is a non-receptor type protein tyrosine phosphatase that is ubiquitously expressed in human cells. TCPTP is a critical component of a variety of key signaling pathways that are directly associated with the formation of cancer and inflammation. Thus, understanding the molecular mechanism of TCPTP activation and regulation is essential for the development of TCPTP therapeutics. Under basal conditions, TCPTP is largely inactive, although how this is achieved is poorly understood. By combining biomolecular nuclear magnetic resonance spectroscopy, small-angle X-ray scattering, and chemical cross-linking coupled with mass spectrometry, we show that the C-terminal intrinsically disordered tail of TCPTP functions as an intramolecular autoinhibitory element that controls the TCPTP catalytic activity. Activation of TCPTP is achieved by cellular competition, i.e., the intrinsically disordered cytosolic tail of Integrin-α1 displaces the TCPTP autoinhibitory tail, allowing for the full activation of TCPTP. This work not only defines the mechanism by which TCPTP is regulated but also reveals that the intrinsically disordered tails of two of the most closely related PTPs (PTP1B and TCPTP) autoregulate the activity of their cognate PTPs via completely different mechanisms.
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7
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The effect of lipocalin-2 (LCN2) on apoptosis: a proteomics analysis study in an LCN2 deficient mouse model. BMC Genomics 2021; 22:892. [PMID: 34903175 PMCID: PMC8670060 DOI: 10.1186/s12864-021-08211-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 11/23/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Recent studies have shown that lipocalin-2 (LCN2) has multiple functions involved in various biological and pathological processes including energy homeostasis, cancer, inflammation, and apoptosis. We aimed to investigate the effect of LCN2 on apoptosis that influences the pathogenetic process of metabolic diseases and cancer. METHODS We performed a proteomics analysis of livers taken from LCN2-knockout mice and wild type mice by using label-free LC-MS/MS quantitative proteomics. RESULTS Proteomic analysis revealed that there were 132 significantly differentially expressed proteins (49 upregulated and 83 downregulated) among 2140 proteins in the liver of LCN2-knockout mice compared with wild type mice. Of these, seven apoptosis-associated proteins were significantly upregulated and seven apoptosis-associated proteins downregulated. CONCLUSION Proteomics demonstrated that there were seven upregulated and seven downregulated apoptosis-associated proteins in liver of LCN2-knockout mice. It is important to clarify the effect of LCN2 on apoptosis that might contribute to the pathogenesis of insulin resistance, cancer, and various nervous system diseases.
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8
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Okamoto Y, Kitakaze K, Takenouchi Y, Yamamoto S, Ishimaru H, Tsuboi K. Sphingosine 1-phosphate receptor type 2 positively regulates interleukin (IL)-4/IL-13-induced STAT6 phosphorylation. Cell Signal 2021; 88:110156. [PMID: 34592416 DOI: 10.1016/j.cellsig.2021.110156] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 08/31/2021] [Accepted: 09/23/2021] [Indexed: 12/12/2022]
Abstract
Previous reports have demonstrated that sphingosine 1-phosphate receptor type 2 (S1P2) is involved in the activation of signal transducer and activator of transcription (STAT) 6. Additionally, the major signaling pathway of S1P2 is the Rho-Rho kinase pathway. In this study, we examined the role of S1P2 in STAT6 activation in a macrophage (Mφ) model using THP-1 cells differentiated with phorbol 12-myristate 13-acetate (PMA). We established S1P2knockout THP-1 cells using the CRISPR-Cas9 gene editing system. The PMA-treated S1P2knockout THP-1 Mφs showed decreases in IL-4/IL-13-induced phosphorylation of Janus-activated kinase (JAK) 1, JAK2, and STAT6 as well as mRNA expression of the M2 marker ARG1 compared with wild-type THP-1 Mφs. Pretreatment of PMA-treated THP-1 Mφs with the S1P2 antagonist JTE-013, the Rho inhibitor Rhosin or the Rho kinase inhibitor Y27632 inhibited the IL-4/IL-13-induced increase in STAT6 phosphorylation. The expressions of suppressor of cytokine signaling 3 in the S1P2knockout THP-1 Mφs were higher than those in wild-type THP-1 Mφs. In addition, the protein tyrosine phosphatase inhibitor vanadate enhanced IL-4-induced STAT6 phosphorylation in the S1P2knockout THP-1 Mφs, suggesting that S1P2-Rho-Rho kinase inhibited the negative regulation of STAT6. These results suggest that the S1P2-Rho-Rho kinase pathway is necessary for full activation of STAT6 by IL-4/IL-13 in Mφs.
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Affiliation(s)
- Yasuo Okamoto
- Department of Pharmacology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
| | - Keisuke Kitakaze
- Department of Pharmacology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan
| | - Yasuhiro Takenouchi
- Department of Pharmacology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan
| | - Shinya Yamamoto
- Department of Pharmacology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan
| | - Hironobu Ishimaru
- Department of Pharmacology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan
| | - Kazuhito Tsuboi
- Department of Pharmacology, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan
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9
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Vinette V, Aubry I, Insull H, Uetani N, Hardy S, Tremblay ML. Protein tyrosine phosphatome metabolic screen identifies TC-PTP as a positive regulator of cancer cell bioenergetics and mitochondrial dynamics. FASEB J 2021; 35:e21708. [PMID: 34169549 DOI: 10.1096/fj.202100207r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 04/29/2021] [Accepted: 05/17/2021] [Indexed: 12/20/2022]
Abstract
Metabolic reprogramming occurs in cancer cells and is regulated partly by the opposing actions of tyrosine kinases and tyrosine phosphatases. Several members of the protein tyrosine phosphatase (PTP) superfamily have been linked to cancer as either pro-oncogenic or tumor-suppressive enzymes. In order to investigate which PTPs can modulate the metabolic state of cancer cells, we performed an shRNA screen of PTPs in HCT116 human colorectal cancer cells. Among the 72 PTPs efficiently targeted, 24 were found to regulate mitochondrial respiration, 8 as negative and 16 as positive regulators. Of the latter, we selected TC-PTP (PTPN2) for further characterization since inhibition of this PTP resulted in major functional defects in oxidative metabolism without affecting glycolytic flux. Transmission electron microscopy revealed an increase in the number of damaged mitochondria in TC-PTP-null cells, demonstrating the potential role of this PTP in regulating mitochondrial homeostasis. Downregulation of STAT3 by siRNA-mediated silencing partially rescued the mitochondrial respiration defect observed in TC-PTP-deficient cells, supporting the role of this signaling axis in regulating mitochondrial activity. In addition, mitochondrial stress prevented an increased expression of electron transport chain-related genes in cells with TC-PTP silencing, correlating with decreased ATP production, cellular proliferation, and migration. Our shRNA-based metabolic screen revealed that PTPs can serve as either positive or negative regulators of cancer cell metabolism. Taken together, our findings uncover a new role for TC-PTP as an activator of mitochondrial metabolism, validating this PTP as a key target for cancer therapeutics.
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Affiliation(s)
- Valerie Vinette
- Department of Biochemistry, McGill University, Montreal, QC, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada
| | - Isabelle Aubry
- Department of Biochemistry, McGill University, Montreal, QC, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada
| | - Hayley Insull
- Department of Biochemistry, McGill University, Montreal, QC, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada
| | - Noriko Uetani
- Department of Biochemistry, McGill University, Montreal, QC, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada
| | - Serge Hardy
- Department of Biochemistry, McGill University, Montreal, QC, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada
| | - Michel L Tremblay
- Department of Biochemistry, McGill University, Montreal, QC, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada
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10
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Wang YN, Liu S, Jia T, Feng Y, Xu X, Zhang D. T Cell Protein Tyrosine Phosphatase in Glucose Metabolism. Front Cell Dev Biol 2021; 9:682947. [PMID: 34268308 PMCID: PMC8276021 DOI: 10.3389/fcell.2021.682947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/09/2021] [Indexed: 11/17/2022] Open
Abstract
T cell protein tyrosine phosphatase (TCPTP), a vital regulator in glucose metabolism, inflammatory responses, and tumor processes, is increasingly considered a promising target for disease treatments and illness control. This review discusses the structure, substrates and main biological functions of TCPTP, as well as its regulatory effect in glucose metabolism, as an attempt to be referenced for formulating treatment strategies of metabolic disorders. Given the complicated regulation functions in different tissues and organs of TCPTP, the development of drugs inhibiting TCPTP with a higher specificity and a better biocompatibility is recognized as a promising therapeutic strategy for diabetes or obesity. Besides, treatments targeting TCPTP in a specific tissue or organ are suggested to be considerably promising.
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Affiliation(s)
- Ya-Nan Wang
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China.,Shandong Key Laboratory of Oral Tissue Regeneration, Jinan, China.,Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, China
| | - Shiyue Liu
- Shandong Key Laboratory of Oral Tissue Regeneration, Jinan, China.,Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, China.,Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Tingting Jia
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China.,Shandong Key Laboratory of Oral Tissue Regeneration, Jinan, China.,Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, China
| | - Yao Feng
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China.,Shandong Key Laboratory of Oral Tissue Regeneration, Jinan, China.,Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, China
| | - Xin Xu
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China.,Shandong Key Laboratory of Oral Tissue Regeneration, Jinan, China.,Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, China
| | - Dongjiao Zhang
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China.,Shandong Key Laboratory of Oral Tissue Regeneration, Jinan, China.,Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, China
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11
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The roles of post-translational modifications and coactivators of STAT6 signaling in tumor growth and progression. Future Med Chem 2020; 12:1945-1960. [DOI: 10.4155/fmc-2020-0224] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Signal transducers and activators of transcription 6 (STAT6) are highly expressed in various tumors and associated with tumorigenesis, immunosuppression, proliferation, metastasis and poor prognosis in human cancers. In response to IL-4/13, STAT6 is phosphorylated, dimerizes and triggers transcriptional regulation after recruitment of coactivators to transcriptosome, such as CBP/p300, SRC-1, PARP-14 and PSF. Post-translational modifications, including phosphorylation, ubiquitination, ADP-ribosylation and acetylation, have been explored for molecular mechanisms of STAT6 in tumor development and management. STAT6 has been developed as a specific biomarker for distinguishing and diagnosing tumor phenotypes, although it is observed to be frequently mutated in metastatic tumors. In this article, we focus mainly on the structural characteristics of STAT6 and its role in tumor growth and progression.
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12
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Flosbach M, Oberle SG, Scherer S, Zecha J, von Hoesslin M, Wiede F, Chennupati V, Cullen JG, List M, Pauling JK, Baumbach J, Kuster B, Tiganis T, Zehn D. PTPN2 Deficiency Enhances Programmed T Cell Expansion and Survival Capacity of Activated T Cells. Cell Rep 2020; 32:107957. [PMID: 32726622 PMCID: PMC7408006 DOI: 10.1016/j.celrep.2020.107957] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/20/2020] [Accepted: 07/02/2020] [Indexed: 01/18/2023] Open
Abstract
Manipulating molecules that impact T cell receptor (TCR) or cytokine signaling, such as the protein tyrosine phosphatase non-receptor type 2 (PTPN2), has significant potential for advancing T cell-based immunotherapies. Nonetheless, it remains unclear how PTPN2 impacts the activation, survival, and memory formation of T cells. We find that PTPN2 deficiency renders cells in vivo and in vitro less dependent on survival-promoting cytokines, such as interleukin (IL)-2 and IL-15. Remarkably, briefly ex vivo-activated PTPN2-deficient T cells accumulate in 3- to 11-fold higher numbers following transfer into unmanipulated, antigen-free mice. Moreover, the absence of PTPN2 augments the survival of short-lived effector T cells and allows them to robustly re-expand upon secondary challenge. Importantly, we find no evidence for impaired effector function or memory formation. Mechanistically, PTPN2 deficiency causes broad changes in the expression and phosphorylation of T cell expansion and survival-associated proteins. Altogether, our data underline the therapeutic potential of targeting PTPN2 in T cell-based therapies to augment the number and survival capacity of antigen-specific T cells.
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Affiliation(s)
- Markus Flosbach
- Division of Animal Physiology and Immunology, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Susanne G Oberle
- Division of Immunology and Allergy, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland
| | - Stefanie Scherer
- Division of Animal Physiology and Immunology, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany; Division of Immunology and Allergy, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland
| | - Jana Zecha
- Chair of Proteomics and Bioanalytics, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Madlaina von Hoesslin
- Division of Animal Physiology and Immunology, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Florian Wiede
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Peter MacCallum Cancer Centre, Melbourne, VIC 3000, Australia
| | - Vijaykumar Chennupati
- Division of Immunology and Allergy, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland
| | - Jolie G Cullen
- Division of Animal Physiology and Immunology, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Markus List
- Big Data in BioMedicine Group, Chair of Experimental Bioinformatics, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Josch K Pauling
- ZD.B Junior Research Group LipiTUM, Chair of Experimental Bioinformatics, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Jan Baumbach
- Chair of Experimental Bioinformatics, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Bernhard Kuster
- Chair of Proteomics and Bioanalytics, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany
| | - Tony Tiganis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Peter MacCallum Cancer Centre, Melbourne, VIC 3000, Australia; Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Dietmar Zehn
- Division of Animal Physiology and Immunology, TUM School of Life Sciences Weihenstephan, Technical University of Munich (TUM), Freising, Germany; Division of Immunology and Allergy, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland.
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13
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Clinical and biological features of PTPN2-deleted adult and pediatric T-cell acute lymphoblastic leukemia. Blood Adv 2020; 3:1981-1988. [PMID: 31270080 DOI: 10.1182/bloodadvances.2018028993] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 05/06/2019] [Indexed: 11/20/2022] Open
Abstract
Protein tyrosine phosphatase nonreceptor type 2 (PTPN2) is a phosphatase known to be a tumor suppressor gene in T-cell acute lymphoblastic leukemia (T-ALL). Because the full clinicobiologic characteristics of PTPN2 loss remain poorly reported, we aimed to provide a comprehensive analysis of PTPN2 deletions within a cohort of 430 patients, including 216 adults and 214 children treated according to the GRAALL03/05 (#NCT00222027 and #NCT00327678) and the FRALLE2000 protocols, respectively. We used multiplex ligation-dependent probe amplification to identify an 8% incidence of PTPN2 deletion, which was comparable in adult (9%) and pediatric (6%) populations. PTPN2 deletions were significantly associated with an αβ lineage and TLX1 deregulation. Analysis of the mutational genotype of adult T-ALL revealed a positive correlation between PTPN2 deletions and gain-of-function alterations in the IL7R/JAK-STAT signaling pathway as well as PHF6 and WT1 mutations. Of note, PTPN2 and PTEN (phosphatase and tensin homolog) deletions were mutually exclusive. Regarding treatment response, PTPN2-deleted T-ALLs were associated with a higher glucocorticoid response and a trend for improved survival in children, but not in adults, with a 5-year cumulative incidence of relapse of 8% for PTPN2-deleted pediatric cases vs 26% (P = .177).
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14
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Morales LD, Archbold AK, Olivarez S, Slaga TJ, DiGiovanni J, Kim DJ. The role of T-cell protein tyrosine phosphatase in epithelial carcinogenesis. Mol Carcinog 2019; 58:1640-1647. [PMID: 31264291 DOI: 10.1002/mc.23078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 02/06/2023]
Abstract
T-cell protein tyrosine phosphatase (TC-PTP, encoded by PTPN2) is a nonreceptor PTP that is most highly expressed in hematopoietic tissues. TC-PTP modulates a variety of physiological functions including cell cycle progression, cell survival and proliferation, and hematopoiesis through tyrosine dephosphorylation of its target substrates, such as EGFR, JAK1, JAK3, STAT1, and STAT3. Studies with whole or tissue-specific loss of TC-PTP function transgenic mice have shown that TC-PTP has crucial roles in the regulation of the immune response, insulin signaling, and oncogenic signaling. More recently, the generation of epidermal-specific TC-PTP-deficient mice for use in multistage skin carcinogenesis bioassays demonstrated that TC-PTP suppresses skin tumor formation by negatively regulating STAT3 and AKT signaling. Further investigation showed that TC-PTP also minimizes UVB-induced epidermal cell damage by promoting apoptosis through the negative regulation of Flk-1/JNK signaling. These findings provide major evidence for a tumor suppressive function for TC-PTP against environment-induced skin cancer. Here, we will discuss TC-PTP, its substrates, and its functions with an emphasis on its role in skin carcinogenesis.
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Affiliation(s)
- Liza D Morales
- Department of Human Genetics, School of Medicine, University of Texas Rio Grande Valley, Edinburg, Texas
| | - Anna K Archbold
- Department of Molecular Science, School of Medicine, University of Texas Rio Grande Valley, Edinburg, Texas
| | - Serena Olivarez
- Department of Molecular Science, School of Medicine, University of Texas Rio Grande Valley, Edinburg, Texas
| | - Thomas J Slaga
- Department of Pharmacology, School of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - John DiGiovanni
- Division of Pharmacology & Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, Texas
| | - Dae Joon Kim
- Department of Human Genetics, School of Medicine, University of Texas Rio Grande Valley, Edinburg, Texas.,Department of Molecular Science, School of Medicine, University of Texas Rio Grande Valley, Edinburg, Texas
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15
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Hamel-Côté G, Lapointe F, Véronneau S, Mayhue M, Rola-Pleszczynski M, Stankova J. Regulation of platelet-activating factor-mediated interleukin-6 promoter activation by the 48 kDa but not the 45 kDa isoform of protein tyrosine phosphatase non-receptor type 2. Cell Biosci 2019; 9:51. [PMID: 31289638 PMCID: PMC6593612 DOI: 10.1186/s13578-019-0316-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 06/20/2019] [Indexed: 12/20/2022] Open
Abstract
Background An underlying state of inflammation is thought to be an important cause of cardiovascular disease. Among cells involved in the early steps of atherosclerosis, monocyte-derived dendritic cells (Mo-DCs) respond to inflammatory stimuli, including platelet-activating factor (PAF), by the induction of various cytokines, such as interleukin 6 (IL-6). PAF is a potent phospholipid mediator involved in both the onset and progression of atherosclerosis. It mediates its effects by binding to its cognate G-protein coupled receptor, PAFR. Activation of PAFR-induced signaling pathways is tightly coordinated to ensure specific cell responses. Results Here, we report that PAF stimulated the phosphatase activity of both the 45 and 48 kDa isoforms of the protein tyrosine phosphatase non-receptor type 2 (PTPN2). However, we found that only the 48 kDa PTPN2 isoform has a role in PAFR-induced signal transduction, leading to activation of the IL-6 promoter. In luciferase reporter assays, expression of the 48 kDa, but not the 45 kDa, PTPN2 isoform increased human IL-6 (hIL-6) promoter activity by 40% after PAF stimulation of HEK-293 cells, stably transfected with PAFR (HEK-PAFR). Our results suggest that the differential localization of the PTPN2 isoforms and the differences in PAF-induced phosphatase activation may contribute to the divergent modulation of PAF-induced IL-6 promoter activation. The involvement of PTPN2 in PAF-induced IL-6 expression was confirmed in immature Mo-DCs (iMo-DCs), using siRNAs targeting the two isoforms of PTPN2, where siRNAs against the 48 kDa PTPN2 significantly inhibited PAF-stimulated IL-6 mRNA expression. Pharmacological inhibition of several signaling pathways suggested a role for PTPN2 in early signaling events. Results obtained by Western blot confirmed that PTPN2 increased the activation of the PI3K/Akt pathway via the modulation of protein kinase D (PKD) activity. WT PKD expression counteracted the effect of PTPN2 on PAF-induced IL-6 promoter transactivation and phosphorylation of Akt. Using siRNAs targeting the individual isoforms of PTPN2, we confirmed that these pathways were also active in iMo-DCs. Conclusion Taken together, our data suggest that PTPN2, in an isoform-specific manner, could be involved in the positive regulation of PI3K/Akt activation, via the modulation of PKD activity, allowing for the maximal induction of PAF-stimulated IL-6 mRNA expression.
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Affiliation(s)
- Geneviève Hamel-Côté
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC Canada
| | - Fanny Lapointe
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC Canada
| | - Steeve Véronneau
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC Canada
| | - Marian Mayhue
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC Canada
| | - Marek Rola-Pleszczynski
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC Canada
| | - Jana Stankova
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC Canada
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16
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Abstract
CD3+CD4-CD8- T cells (double-negative T cells; DNTs) have diverse functions in peripheral immune-related diseases by regulating immunological and inflammatory homeostasis. However, the functions of DNTs in the central nervous system remain unknown. Here, we found that the levels of DNTs were dramatically increased in both the brain and peripheral blood of stroke patients and in a mouse model in a time-dependent manner. The infiltrating DNTs enhanced cerebral immune and inflammatory responses and exacerbated ischemic brain injury by modulating the FasL/PTPN2/TNF-α signaling pathway. Blockade of this pathway limited DNT-mediated neuroinflammation and improved the outcomes of stroke. Our results identified a critical function of DNTs in the ischemic brain, suggesting that this unique population serves as an attractive target for the treatment of ischemic stroke.
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17
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Meeusen B, Janssens V. Tumor suppressive protein phosphatases in human cancer: Emerging targets for therapeutic intervention and tumor stratification. Int J Biochem Cell Biol 2017; 96:98-134. [PMID: 29031806 DOI: 10.1016/j.biocel.2017.10.002] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 10/04/2017] [Accepted: 10/05/2017] [Indexed: 02/06/2023]
Abstract
Aberrant protein phosphorylation is one of the hallmarks of cancer cells, and in many cases a prerequisite to sustain tumor development and progression. Like protein kinases, protein phosphatases are key regulators of cell signaling. However, their contribution to aberrant signaling in cancer cells is overall less well appreciated, and therefore, their clinical potential remains largely unexploited. In this review, we provide an overview of tumor suppressive protein phosphatases in human cancer. Along their mechanisms of inactivation in defined cancer contexts, we give an overview of their functional roles in diverse signaling pathways that contribute to their tumor suppressive abilities. Finally, we discuss their emerging roles as predictive or prognostic markers, their potential as synthetic lethality targets, and the current feasibility of their reactivation with pharmacologic compounds as promising new cancer therapies. We conclude that their inclusion in clinical practice has obvious potential to significantly improve therapeutic outcome in various ways, and should now definitely be pushed forward.
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Affiliation(s)
- Bob Meeusen
- Laboratory of Protein Phosphorylation & Proteomics, Dept. of Cellular & Molecular Medicine, Faculty of Medicine, KU Leuven & Leuven Cancer Institute (LKI), KU Leuven, Belgium
| | - Veerle Janssens
- Laboratory of Protein Phosphorylation & Proteomics, Dept. of Cellular & Molecular Medicine, Faculty of Medicine, KU Leuven & Leuven Cancer Institute (LKI), KU Leuven, Belgium.
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18
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Elson A. Stepping out of the shadows: Oncogenic and tumor-promoting protein tyrosine phosphatases. Int J Biochem Cell Biol 2017; 96:135-147. [PMID: 28941747 DOI: 10.1016/j.biocel.2017.09.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 09/15/2017] [Accepted: 09/16/2017] [Indexed: 12/18/2022]
Abstract
Protein tyrosine phosphorylation is critical for proper function of cells and organisms. Phosphorylation is regulated by the concerted but generically opposing activities of tyrosine kinases (PTKs) and tyrosine phosphatases (PTPs), which ensure its proper regulation, reversibility, and ability to respond to changing physiological situations. Historically, PTKs have been associated mainly with oncogenic and pro-tumorigenic activities, leading to the generalization that protein dephosphorylation is anti-oncogenic and hence that PTPs are tumor-suppressors. In many cases PTPs do suppress tumorigenesis. However, a growing body of evidence indicates that PTPs act as dominant oncogenes and drive cell transformation in a number of contexts, while in others PTPs support transformation that is driven by other oncogenes. This review summarizes the known transforming and tumor-promoting activities of the classical, tyrosine specific PTPs and highlights their potential as drug targets for cancer therapy.
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Affiliation(s)
- Ari Elson
- Department of Molecular Genetics, The Weizmann Institute of Science, Rehovot, 76100, Israel.
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19
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Krishnan M, McCole DF. T cell protein tyrosine phosphatase prevents STAT1 induction of claudin-2 expression in intestinal epithelial cells. Ann N Y Acad Sci 2017; 1405:116-130. [PMID: 28804910 DOI: 10.1111/nyas.13439] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 06/21/2017] [Accepted: 06/26/2017] [Indexed: 12/11/2022]
Abstract
T cell protein tyrosine phosphatase (TCPTP) dephosphorylates a number of substrates, including JAK-STAT (signal transducer and activator of transcription) signaling proteins, which are activated by interferon (IFN)-γ, a major proinflammatory cytokine involved in conditions such as inflammatory bowel disease. A critical function of the intestinal epithelium is formation of a selective barrier to luminal contents. The structural units of the epithelium that regulate barrier function are the tight junctions (TJs), and the protein composition of the TJ determines the tightness of the barrier. Claudin-2 is a TJ protein that increases permeability to cations and reduces transepithelial electrical resistance (TER). We previously showed that transient knockdown (KD) of TCPTP permits increased expression of claudin-2 by IFN-γ. Here, we demonstrate that the decreased TER in TCPTP-deficient epithelial cells is alleviated by STAT1 KD. Moreover, increased claudin-2 in TCPTP-deficient cells requires enhanced STAT1 activation and STAT1 binding to the CLDN2 promoter. We also show that mutation of this STAT-binding site prevents elevated CLDN2 promoter activity in TCPTP-deficient epithelial cells. In summary, we demonstrate that TCPTP protects the intestinal epithelial barrier by restricting STAT-induced claudin-2 expression. This is a potential mechanism by which loss-of-function mutations in the gene encoding TCPTP may contribute to barrier defects in chronic intestinal inflammatory disease.
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Affiliation(s)
- Moorthy Krishnan
- Division of Biomedical Sciences, University of California, Riverside, California
| | - Declan F McCole
- Division of Biomedical Sciences, University of California, Riverside, California
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20
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Kim WJ, Koo JH, Cho HJ, Lee JU, Kim JY, Lee HG, Lee S, Kim JH, Oh MS, Suh M, Shin EC, Ko JY, Sohn MH, Choi JM. Protein tyrosine phosphatase conjugated with a novel transdermal delivery peptide, astrotactin 1-derived peptide recombinant protein tyrosine phosphatase (AP-rPTP), alleviates both atopic dermatitis-like and psoriasis-like dermatitis. J Allergy Clin Immunol 2017; 141:137-151. [PMID: 28456618 DOI: 10.1016/j.jaci.2017.04.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 03/20/2017] [Accepted: 04/04/2017] [Indexed: 11/27/2022]
Abstract
BACKGROUND Atopic dermatitis (AD) and psoriasis are the 2 most common chronic inflammatory skin diseases. There is an unmet medical need to overcome limitations for transcutaneous drug development posed by the skin barrier. OBJECTIVE We aimed to identify a novel transdermal delivery peptide and to develop a transcutaneously applicable immunomodulatory protein for treating AD and psoriasis. METHODS We identified and generated reporter proteins conjugated to astrotactin 1-derived peptide (AP), a novel transdermal delivery peptide of human origin, and analyzed the intracellular delivery efficiency of these proteins in mouse and human skin cells and tissues using multiphoton confocal microscopy. We also generated a recombinant therapeutic protein, AP-recombinant protein tyrosine phosphatase (rPTP), consisting of the phosphatase domain of the T-cell protein tyrosine phosphatase conjugated to AP. The immunomodulatory function of AP-rPTP was confirmed in splenocytes on cytokine stimulation and T-cell receptor stimulation. Finally, we confirmed the in vivo efficacy of AP-rPTP transdermal delivery in patients with oxazolone-induced contact hypersensitivity, ovalbumin-induced AD-like, and imiquimod-induced psoriasis-like skin inflammation models. RESULTS AP-conjugated reporter proteins exhibited significant intracellular transduction efficacy in keratinocytes, fibroblasts, and immune cells. In addition, transcutaneous administration of AP-dTomato resulted in significant localization into the dermis and epidermis in both mouse and human skin. AP-rPTP inhibited phosphorylated signal transducer and activator of transcription (STAT) 1, STAT3, and STAT6 in splenocytes and also regulated T-cell activation and proliferation. Transcutaneous administration of AP-rPTP through the paper-patch technique significantly ameliorated skin tissue thickening, inflammation, and cytokine expression in both AD-like and psoriasis-like dermatitis models. CONCLUSION We identified a 9-amino-acid novel transdermal delivery peptide, AP, and demonstrated its feasibility for transcutaneous biologic drug development. Moreover, AP-rPTP is a novel immunomodulatory drug candidate for human dermatitis.
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Affiliation(s)
- Won-Ju Kim
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea
| | - Ja-Hyun Koo
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea
| | - Hyun-Jung Cho
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea
| | - Jae-Ung Lee
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea
| | - Ji Yun Kim
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea
| | - Hong-Gyun Lee
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea
| | - Sohee Lee
- Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Korea
| | - Jong Hoon Kim
- Laboratory of Immunology and Infectious Diseases, Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Mi Seon Oh
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Minah Suh
- Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Korea; Department of Biomedical Engineering, Sungkyunkwan University, Suwon, Korea; Samsung Advanced Institute for Health Sciences & Technology (SAIHST), Seoul, Korea
| | - Eui-Cheol Shin
- Laboratory of Immunology and Infectious Diseases, Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Joo Yeon Ko
- Department of Dermatology, College of Medicine, Hanyang University, Seoul, Korea
| | - Myung Hyun Sohn
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Je-Min Choi
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, Korea; Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Korea.
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21
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Feng Y, Wang Y, Liu H, Liu Z, Mills C, Han Y, Hung RJ, Brhane Y, McLaughlin J, Brennan P, Bickeboeller H, Rosenberger A, Houlston RS, Caporaso NE, Teresa Landi M, Brueske I, Risch A, Ye Y, Wu X, Christiani DC, Amos CI, Wei Q. Genetic variants of PTPN2 are associated with lung cancer risk: a re-analysis of eight GWASs in the TRICL-ILCCO consortium. Sci Rep 2017; 7:825. [PMID: 28400551 PMCID: PMC5429754 DOI: 10.1038/s41598-017-00850-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 03/15/2017] [Indexed: 01/25/2023] Open
Abstract
The T-cell protein tyrosine phosphatase (TCPTP) pathway consists of signaling events mediated by TCPTP. Mutations and genetic variants of some genes in the TCPTP pathway are associated with lung cancer risk and survival. In the present study, we first investigated associations of 5,162 single nucleotide polymorphisms (SNPs) in 43 genes of this TCPTP pathway with lung cancer risk by using summary data of six published genome-wide association studies (GWAS) of 12,160 cases and 16,838 controls. We identified 11 independent SNPs in eight genes after correction for multiple comparisons by a false discovery rate <0.20. Then, we performed in silico functional analyses for these 11 SNPs by eQTL analysis, two of which, PTPN2 SNPs rs2847297 and rs2847282, were chosen as tagSNPs. We further included two additional GWAS datasets of Harvard University (984 cases and 970 controls) and deCODE (1,319 cases and 26,380 controls), and the overall effects of these two SNPs among all eight GWAS studies remained significant (OR = 0.95, 95% CI = 0.92-0.98, and P = 0.004 for rs2847297; OR = 0.95, 95% CI = 0.92-0.99, and P = 0.009 for rs2847282). In conclusion, the PTPN2 rs2847297 and rs2847282 may be potential susceptible loci for lung cancer risk.
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Affiliation(s)
- Yun Feng
- Department of Respiration, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Yanru Wang
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Hongliang Liu
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Zhensheng Liu
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Coleman Mills
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Younghun Han
- Community and Family Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Rayjean J Hung
- Lunenfeld-Tanenbaum Research Institute of Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Yonathan Brhane
- Lunenfeld-Tanenbaum Research Institute of Mount Sinai Hospital, Toronto, Ontario, Canada
| | | | - Paul Brennan
- Genetic Epidemiology Group, International Agency for Research on Cancer (IARC), 69372, Lyon, France
| | - Heike Bickeboeller
- Department of Genetic Epidemiology, University Medical Center, Georg-August-University Göttingen, 37073, Göttingen, Germany
| | - Albert Rosenberger
- Department of Genetic Epidemiology, University Medical Center, Georg-August-University Göttingen, 37073, Göttingen, Germany
| | - Richard S Houlston
- Division of Genetics and Epidemiology, the Institute of Cancer Research, London, SW7 3RP, UK
| | - Neil E Caporaso
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Maria Teresa Landi
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Irene Brueske
- Helmholtz Centre Munich, German Research Centre for Environmental Health, Institute of Epidemiology I, 85764, Neuherberg, Germany
| | - Angela Risch
- Department of Molecular Biology, University of Salzburg, 5020, Salzburg, Austria
| | - Yuanqing Ye
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Xifeng Wu
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - David C Christiani
- Massachusetts General Hospital, Boston, MA 02114, USA, Department of Environmental Health, Harvard School of Public Health, Boston, MA, 02115, USA
| | - Christopher I Amos
- Community and Family Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Qingyi Wei
- Duke Cancer Institute, Duke University Medical Center, Durham, NC, 27710, USA.
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA.
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22
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Adel S, Mansour A, Louka M, Matboli M, Elmekkawi SF, Swelam N. Evaluation of MicroRNA-210 and Protein tyrosine phosphatase, non-receptor type 2 in Pre-eclampsia. Gene 2016; 596:105-109. [PMID: 27746364 DOI: 10.1016/j.gene.2016.10.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 09/20/2016] [Accepted: 10/11/2016] [Indexed: 11/18/2022]
Abstract
BACKGROUND The precise origin of Pre-eclampsia (PE) remains elusive. Multiple pieces of evidence support the existence of hypoxia in PE. MiRNA-210 (miR-210), which is induced by Hypoxia-Inducible Factor-1α (HIF-1α) during hypoxia, is one of the most hypoxia sensitive miRNAs. MiR-210 mediates these functions by regulating a lot of target mRNAs. Protein tyrosine phosphatase, non-receptor type 2 (PTPN2) was one of miR-210 targets and was found to be down regulated by hypoxia. OBJECTIVE To assess the levels of relative expression of miR-210 and its target PTPN2 in Egyptian women with PE. This is in order to clarify their possible role in the progression of PE and their relation to each other and to different clinicopathological factors. STUDY DESIGN Group1 included 35 normal primigravida and group 2 included 35 primigravida patients with PE. PE group was subdivided into-mild and severe (PE). Total RNA was extracted from placental tissue samples and Real-Time PCR was performed on the extracted RNA. RESULTS There was a highly significant difference between the studied groups as regards fold change of placental miR-210 and PTPN2 (P<0.01). There was a highly significant negative correlation between miR-210 and PTPN2 RQ among the studied groups and among the preeclampsia group (P<0.01). CONCLUSION The results of this study demonstrated that placental expression of miR-210 was up regulated in pregnancies complicated with PE in comparison to normal pregnancies. This increase in miR-210 resulted in down regulation of its target PTPN2 mRNA and this can have a direct role in the pathogenesis of the PE disease. Additionally, both miR-210 & PTPN2 relative expression could differentiate between mild & severe PE.
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Affiliation(s)
- Sherihan Adel
- Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Amal Mansour
- Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Manal Louka
- Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - M Matboli
- Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - S F Elmekkawi
- Obstetrics & Gynecology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Nahed Swelam
- Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
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23
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miR-181a negatively regulates NF-κB signaling and affects activated B-cell-like diffuse large B-cell lymphoma pathogenesis. Blood 2016; 127:2856-66. [PMID: 26941399 DOI: 10.1182/blood-2015-11-680462] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 02/18/2016] [Indexed: 01/10/2023] Open
Abstract
Distinct subgroups of diffuse large B-cell lymphoma (DLBCL) genetically resemble specific mature B-cell populations that are blocked at different stages of the immune response in germinal centers (GCs). The activated B-cell (ABC)-like subgroup resembles post-GC plasmablasts undergoing constitutive survival signaling, yet knowledge of the mechanisms that negatively regulate this oncogenic signaling remains incomplete. In this study, we report that microRNA (miR)-181a is a negative regulator of nuclear factor κ-light-chain enhancer of activated B-cells (NF-κB) signaling. miR-181a overexpression significantly decreases the expression and activity of key NF-κB signaling components. Moreover, miR-181a decreases DLBCL tumor cell proliferation and survival, and anti-miR-181a abrogates these effects. Remarkably, these effects are augmented in the NF-κB dependent ABC-like subgroup compared with the GC B-cell (GCB)-like DLBCL subgroup. Concordantly, in vivo analyses of miR-181a induction in xenografts results in slower tumor growth rate and prolonged survival in the ABC-like DLBCL xenografts compared with the GCB-like DLBCL. We link these outcomes to relatively lower endogenous miR-181a expression and to NF-κB signaling dependency in the ABC-like DLBCL subgroup. Our findings indicate that miR-181a inhibits NF-κB activity, and that manipulation of miR-181a expression in the ABC-like DLBCL genetic background may result in a significant change in the proliferation and survival phenotype of this malignancy.
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Dwivedi G, Gran MA, Bagchi P, Kemp ML. Dynamic Redox Regulation of IL-4 Signaling. PLoS Comput Biol 2015; 11:e1004582. [PMID: 26562652 PMCID: PMC4642971 DOI: 10.1371/journal.pcbi.1004582] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 09/29/2015] [Indexed: 12/22/2022] Open
Abstract
Quantifying the magnitude and dynamics of protein oxidation during cell signaling is technically challenging. Computational modeling provides tractable, quantitative methods to test hypotheses of redox mechanisms that may be simultaneously operative during signal transduction. The interleukin-4 (IL-4) pathway, which has previously been reported to induce reactive oxygen species and oxidation of PTP1B, may be controlled by several other putative mechanisms of redox regulation; widespread proteomic thiol oxidation observed via 2D redox differential gel electrophoresis upon IL-4 treatment suggests more than one redox-sensitive protein implicated in this pathway. Through computational modeling and a model selection strategy that relied on characteristic STAT6 phosphorylation dynamics of IL-4 signaling, we identified reversible protein tyrosine phosphatase (PTP) oxidation as the primary redox regulatory mechanism in the pathway. A systems-level model of IL-4 signaling was developed that integrates synchronous pan-PTP oxidation with ROS-independent mechanisms. The model quantitatively predicts the dynamics of IL-4 signaling over a broad range of new redox conditions, offers novel hypotheses about regulation of JAK/STAT signaling, and provides a framework for interrogating putative mechanisms involving receptor-initiated oxidation. Incomplete reduction of oxygen during respiration results in the formation of highly reactive molecules known as reactive oxygen species (ROS) that react indiscriminately with cellular components and adversely affect cellular function. For a long time ROS were thought solely to be undesirable byproducts of respiration. Indeed, high levels of ROS are associated with a number of diseases. Despite these facts, antioxidants, agents that neutralize ROS, have not shown any clinical benefits when used as oral supplements. This paradox is partially explained by discoveries over the last two decades demonstrating that ROS are not always detrimental and may be essential for controlling physiological processes like cell signaling. However, the mechanisms by which ROS react with biomolecules are not well understood. In this work we have combined biological experiments with novel computational methods to identify the most important mechanisms of ROS-mediated regulation in the IL-4 signaling pathway of the immune system. We have also developed a detailed computer model of the IL-4 pathway and its regulation by ROS dependent and independent methods. Our work enhances the understanding of principles underlying regulation of cell signaling by ROS and has potential implications in advancing therapeutic methods targeting ROS and their adverse effects.
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Affiliation(s)
- Gaurav Dwivedi
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Margaret A. Gran
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Pritha Bagchi
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Melissa L. Kemp
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia, United States of America
- * E-mail:
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25
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Bileck A, Ferk F, Al-Serori H, Koller VJ, Muqaku B, Haslberger A, Auwärter V, Gerner C, Knasmüller S. Impact of a synthetic cannabinoid (CP-47,497-C8) on protein expression in human cells: evidence for induction of inflammation and DNA damage. Arch Toxicol 2015; 90:1369-82. [PMID: 26194647 DOI: 10.1007/s00204-015-1569-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 07/06/2015] [Indexed: 01/12/2023]
Abstract
Synthetic cannabinoids (SCs) are marketed worldwide as legal surrogates for marihuana. In order to predict potential health effects in consumers and to elucidate the underlying mechanisms of action, we investigated the impact of a representative of the cyclohexylphenols, CP47,497-C8, which binds to both cannabinoid receptors, on protein expression patterns, genomic stability and on induction of inflammatory cytokines in human lymphocytes. After treatment of the cells with the drug, we found pronounced up-regulation of a variety of enzymes in nuclear extracts which are involved in lipid metabolism and inflammatory signaling; some of the identified proteins are also involved in the endogenous synthesis of endocannabinoids. The assumption that the drug causes inflammation is further supported by results obtained in additional experiments with cytosols of LPS-stimulated lymphocytes which showed that the SC induces pro-inflammatory cytokines (IL12p40 and IL-6) as well as TNF-α. Furthermore, the proteome analyses revealed that the drug causes down-regulation of proteins which are involved in DNA repair. This observation provides an explanation for the formation of comets which was seen in single-cell gel electrophoresis assays and for the induction of micronuclei (which reflect structural and numerical chromosomal aberrations) by the drug. These effects were seen in experiments with human lymphocytes which were conducted under identical conditions as the proteome analysis. Taken together, the present findings indicate that the drug (and possibly other structurally related SCs) may cause DNA damage and inflammation in directly exposed cells of consumers.
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Affiliation(s)
- Andrea Bileck
- Faculty of Chemistry, Institute of Analytical Chemistry, University of Vienna, Währingerstr. 38, 1090, Vienna, Austria
| | - Franziska Ferk
- Department of Internal Medicine 1, Comprehensive Cancer Center, Institute of Cancer Research, Medical University of Vienna, Borschkegasse 8A, 1090, Vienna, Austria
| | - Halh Al-Serori
- Department of Internal Medicine 1, Comprehensive Cancer Center, Institute of Cancer Research, Medical University of Vienna, Borschkegasse 8A, 1090, Vienna, Austria
| | - Verena J Koller
- Department of Internal Medicine 1, Comprehensive Cancer Center, Institute of Cancer Research, Medical University of Vienna, Borschkegasse 8A, 1090, Vienna, Austria
| | - Besnik Muqaku
- Faculty of Chemistry, Institute of Analytical Chemistry, University of Vienna, Währingerstr. 38, 1090, Vienna, Austria
| | - Alexander Haslberger
- Department of Nutritional Sciences, University of Vienna, UZA 2/2D541, Althanstrasse 14, 1090, Vienna, Austria
| | - Volker Auwärter
- Institute of Forensic Medicine, University Medical Center Freiburg, Albertstraße 9, 79104, Freiburg, Germany
| | - Christopher Gerner
- Faculty of Chemistry, Institute of Analytical Chemistry, University of Vienna, Währingerstr. 38, 1090, Vienna, Austria
| | - Siegfried Knasmüller
- Department of Internal Medicine 1, Comprehensive Cancer Center, Institute of Cancer Research, Medical University of Vienna, Borschkegasse 8A, 1090, Vienna, Austria.
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26
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Fu X, Wang X, Duan Z, Zhang C, Fu X, Yang J, Liu X, He J. Histone H3k9 and H3k27 Acetylation Regulates IL-4/STAT6-Mediated Igε Transcription in B Lymphocytes. Anat Rec (Hoboken) 2015; 298:1431-9. [PMID: 25952120 DOI: 10.1002/ar.23172] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 03/04/2015] [Accepted: 03/17/2015] [Indexed: 12/25/2022]
Abstract
IL-4 activates STAT6 and causes the subsequent up-regulation of Ig heavy chain germline Igε via chromatin remodeling involved in B lymphocytes development. STAT6 acts as a molecular switch to regulate the higher-order chromatin remodeling via dynamically orchestrating co-activators (CBP/Tudor-SN) and co-repressors (HDAC1/PSF). Here, we demonstrated that STAT6/Tudor-SN/PSF form a complex, balancing the acetylation and deacetylation states to co-regulate IL-4/STAT6 gene transcription. In addition, we confirmed that IL-4 treatment increased the HATs activity in Ramos cells. As "active" markers, the expression of H3K9ac and H3K27ac increased after treatment with IL-4. However, transcriptional repressors such as H3K9me3 and H3K27me3 decreased in response to IL-4 stimulation. Moreover, IL-4 treatment enhanced H3 acetylation at the Igε promoter regions. Our results revealed that the Igε gene transcription is regulated by histone modifications in the IL-4/STAT6 pathway. The study will provide novel insights into the pathogenesis of allergic diseases.
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Affiliation(s)
- Xiao Fu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - Xinting Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - Zhongchao Duan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - Chunyan Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - Xue Fu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - Jie Yang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China.,Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Laboratory of Molecular Immunology, Research Center of Basic Medical Science, Tianjin Medical University, Tianjin, China.,Department of Immunology, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada
| | - Xin Liu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - Jinyan He
- Tianjin Key Laboratory of Cellular and Molecular Immunology, Tianjin Medical University, Tianjin, China.,Key Laboratory of Educational Ministry of China, Tianjin Medical University, Tianjin, China.,Department of Physiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
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Chlamydophila psittaci-negative ocular adnexal marginal zone lymphomas express self polyreactive B-cell receptors. Leukemia 2015; 29:1587-99. [DOI: 10.1038/leu.2015.39] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 01/30/2015] [Accepted: 02/04/2015] [Indexed: 12/27/2022]
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28
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Xi Y, Liu S, Bettaieb A, Matsuo K, Matsuo I, Hosein E, Chahed S, Wiede F, Zhang S, Zhang ZY, Kulkarni RN, Tiganis T, Haj FG. Pancreatic T cell protein-tyrosine phosphatase deficiency affects beta cell function in mice. Diabetologia 2015; 58:122-31. [PMID: 25338551 PMCID: PMC4258175 DOI: 10.1007/s00125-014-3413-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 09/15/2014] [Indexed: 01/10/2023]
Abstract
AIMS/HYPOTHESIS T cell protein tyrosine phosphatase (TCPTP, encoded by PTPN2) regulates cytokine-induced pancreatic beta cell apoptosis and may contribute to the pathogenesis of type 1 diabetes. However, the role of TCPTP in pancreatic endocrine function and insulin secretion remains largely unknown. METHODS To investigate the endocrine role of pancreatic TCPTP we generated mice with pancreas Ptpn2/TCPTP deletion (panc-TCPTP KO). RESULTS When fed regular chow, panc-TCPTP KO and control mice exhibited comparable glucose tolerance. However, when challenged with prolonged high fat feeding panc-TCPTP KO mice exhibited impaired glucose tolerance and attenuated glucose-stimulated insulin secretion (GSIS). The defect in GSIS was recapitulated in primary islets ex vivo and after TCPTP pharmacological inhibition or lentiviral-mediated TCPTP knockdown in the glucose-responsive MIN6 beta cells, consistent with this being cell autonomous. Reconstitution of TCPTP in knockdown cells reversed the defect in GSIS demonstrating that the defect was a direct consequence of TCPTP deficiency. The reduced insulin secretion in TCPTP knockdown MIN6 beta cells was associated with decreased insulin content and glucose sensing. Furthermore, TCPTP deficiency led to enhanced tyrosyl phosphorylation of signal transducer and activator of transcription 1 and 3 (STAT 1/3), and substrate trapping studies in MIN6 beta cells identified STAT 1/3 as TCPTP substrates. STAT3 pharmacological inhibition and small interfering RNA-mediated STAT3 knockdown in TCPTP deficient cells restored GSIS to control levels, indicating that the effects of TCPTP deficiency were mediated, at least in part, through enhanced STAT3 phosphorylation and signalling. CONCLUSIONS/INTERPRETATION These studies identify a novel role for TCPTP in insulin secretion and uncover STAT3 as a physiologically relevant target for TCPTP in the endocrine pancreas.
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Affiliation(s)
- Yannan Xi
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Siming Liu
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Ahmed Bettaieb
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Kosuke Matsuo
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Izumi Matsuo
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Ellen Hosein
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Samah Chahed
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA
| | - Florian Wiede
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Sheng Zhang
- Department of Biochemistry and Molecular Biology, Indiana University, Indianapolis, IN, USA
| | - Zhong-Yin Zhang
- Department of Biochemistry and Molecular Biology, Indiana University, Indianapolis, IN, USA
| | - Rohit N. Kulkarni
- Islet Cell and Regenerative Biology, Research Division, Joslin Diabetes Center, Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Tony Tiganis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Fawaz G. Haj
- Department of Nutrition, University of California Davis, 3135 Meyer Hall, Davis, CA 95616, USA. Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, University of California Davis, Sacramento, CA, USA. Comprehensive Cancer Center, University of California Davis, Sacramento, CA, USA
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Li H, Spagnol G, Naslavsky N, Caplan S, Sorgen PL. TC-PTP directly interacts with connexin43 to regulate gap junction intercellular communication. J Cell Sci 2014; 127:3269-79. [PMID: 24849651 DOI: 10.1242/jcs.145193] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Protein kinases have long been reported to regulate connexins; however, little is known about the involvement of phosphatases in the modulation of intercellular communication through gap junctions and the subsequent downstream effects on cellular processes. Here, we identify an interaction between the T-cell protein tyrosine phosphatase (TC-PTP, officially known as PTPN2) and the carboxyl terminus of connexin43 (Cx43, officially known as GJA1). Two cell lines, normal rat kidney (NRK) cells endogenously expressing Cx43 and an NRK-derived cell line expressing v-Src with temperature-sensitive activity, were used to demonstrate that EGF and v-Src stimulation, respectively, induced TC-PTP to colocalize with Cx43 at the plasma membrane. Cell biology experiments using phospho-specific antibodies and biophysical assays demonstrated that the interaction is direct and that TC-PTP dephosphorylates Cx43 residues Y247 and Y265, but does not affect v-Src. Transfection of TC-PTP also indirectly led to the dephosphorylation of Cx43 S368, by inactivating PKCα and PKCδ, with no effect on the phosphorylation of S279 and S282 (MAPK-dependent phosphorylation sites). Dephosphorylation maintained Cx43 gap junctions at the plaque and partially reversed the channel closure caused by v-Src-mediated phosphorylation of Cx43. Understanding dephosphorylation, along with the well-documented roles of Cx43 phosphorylation, might eventually lead to methods to modulate the regulation of gap junction channels, with potential benefits for human health.
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Affiliation(s)
- Hanjun Li
- Department of Biochemistry and Molecular Biology and the Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Gaelle Spagnol
- Department of Biochemistry and Molecular Biology and the Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Naava Naslavsky
- Department of Biochemistry and Molecular Biology and the Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Steve Caplan
- Department of Biochemistry and Molecular Biology and the Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Paul L Sorgen
- Department of Biochemistry and Molecular Biology and the Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
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Bettaieb A, Xi Y, Hosein E, Coggins N, Bachaalany S, Wiede F, Perez S, Griffey SM, Sastre J, Tiganis T, Haj FG. Pancreatic T cell protein-tyrosine phosphatase deficiency ameliorates cerulein-induced acute pancreatitis. Cell Commun Signal 2014; 12:13. [PMID: 24606867 PMCID: PMC4016516 DOI: 10.1186/1478-811x-12-13] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 02/20/2014] [Indexed: 12/19/2022] Open
Abstract
Background Acute pancreatitis (AP) is a common clinical problem whose incidence has been progressively increasing in recent years. Onset of the disease is trigged by intra-acinar cell activation of digestive enzyme zymogens that induce autodigestion, release of pro-inflammatory cytokines and acinar cell injury. T-cell protein tyrosine phosphatase (TCPTP) is implicated in inflammatory signaling but its significance in AP remains unclear. Results In this study we assessed the role of pancreatic TCPTP in cerulein-induced AP. TCPTP expression was increased at the protein and messenger RNA levels in the early phase of AP in mice and rats. To directly determine whether TCPTP may have a causal role in AP we generated mice with pancreatic TCPTP deletion (panc-TCPTP KO) by crossing TCPTP floxed mice with Pdx1-Cre transgenic mice. Amylase and lipase levels were lower in cerulein-treated panc-TCPTP KO mice compared with controls. In addition, pancreatic mRNA and serum concentrations of the inflammatory cytokines TNFα and IL-6 were lower in panc-TCPTP KO mice. At the molecular level, panc-TCPTP KO mice exhibited enhanced cerulein-induced STAT3 Tyr705 phosphorylation accompanied by a decreased cerulein-induced NF-κB inflammatory response, and decreased ER stress and cell death. Conclusion These findings revealed a novel role for pancreatic TCPTP in the progression of cerulein-induced AP.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Fawaz G Haj
- Department of Nutrition, University of California Davis, One Shields Ave, 3135 Meyer Hall, Davis, CA 95616, USA.
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31
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Böhmer FD, Friedrich K. Protein tyrosine phosphatases as wardens of STAT signaling. JAKSTAT 2014; 3:e28087. [PMID: 24778927 DOI: 10.4161/jkst.28087] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 02/03/2014] [Accepted: 02/03/2014] [Indexed: 02/07/2023] Open
Abstract
Signaling by signal transducers and activators of transcription (STATs) is controlled at many levels of the signaling cascade. Protein tyrosine phosphatases (PTPs) regulate STAT activation at several layers, including direct pSTAT dephosphorylation in both cytoplasm and nucleus. Despite the importance of this regulation mode, many aspects are still incompletely understood, e.g., the identity of PTPs acting on certain members of the STAT family. After a brief introduction into the STAT and PTP families, we discuss here the current knowledge on PTP mediated regulation of STAT activity, focusing on the interaction of individual STATs with specific PTPs. Finally, we highlight open questions and propose important tasks of future research.
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Affiliation(s)
- Frank-D Böhmer
- Institute of Molecular Cell Biology; CMB; Jena University Hospital; Jena, Germany
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32
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Maruyama T, Shimizu J, Suzuki N. T-cell protein tyrosine phosphatase (TCPTP) regulates phosphorylation of Txk, a tyrosine kinase of the Tec family. Inflamm Regen 2014. [DOI: 10.2492/inflammregen.34.240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Abstract
Considerable efforts have been invested to understand the mechanisms by which pro-inflammatory cytokines mediate the demise of β-cells in type 1 diabetes but much less attention has been paid to the role of anti-inflammatory cytokines as potential cytoprotective agents in these cells. Despite this, there is increasing evidence that anti-inflammatory molecules such as interleukin (IL)-4, IL-10 and IL-13 can exert a direct influence of β-cell function and viability and that the circulating levels of these cytokines may be reduced in type 1 diabetes. Thus, it seems possible that targeting of anti-inflammatory pathways might offer therapeutic potential in this disease. In the present review, we consider the evidence implicating IL-4, IL-10 and IL-13 as cytoprotective agents in the β-cell and discuss the receptor components and downstream signaling pathways that mediate these effects.
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Affiliation(s)
- M A Russell
- Institute of Biomedical and Clinical Science; University of
Exeter Medical School; Exeter, Devon, UK
- Correspondence to: MA
Russell;
| | - N G Morgan
- Institute of Biomedical and Clinical Science; University of
Exeter Medical School; Exeter, Devon, UK
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Ylilauri M, Mattila E, Nurminen EM, Käpylä J, Niinivehmas SP, Määttä JA, Pentikäinen U, Ivaska J, Pentikäinen OT. Molecular mechanism of T-cell protein tyrosine phosphatase (TCPTP) activation by mitoxantrone. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2013; 1834:1988-97. [PMID: 23856547 DOI: 10.1016/j.bbapap.2013.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 06/28/2013] [Accepted: 07/07/2013] [Indexed: 10/26/2022]
Abstract
T-cell protein tyrosine phosphatase (TCPTP) is a ubiquitously expressed non-receptor protein tyrosine phosphatase. It is involved in the negative regulation of many cellular signaling pathways. Thus, activation of TCPTP could have important therapeutic applications in diseases such as cancer and inflammation. We have previously shown that the α-cytoplasmic tail of integrin α1β1 directly binds and activates TCPTP. In addition, we have identified in a large-scale high-throughput screen six small molecules that activate TCPTP. These small molecule activators include mitoxantrone and spermidine. In this study, we have investigated the molecular mechanism behind agonist-induced TCPTP activation. By combining several molecular modeling and biochemical techniques, we demonstrate that α1-peptide and mitoxantrone activate TCPTP via direct binding to the catalytic domain, whereas spermidine does not interact with the catalytic domain of TCPTP in vitro. Furthermore, we have identified a hydrophobic groove surrounded by negatively charged residues on the surface of TCPTP as a putative binding site for the α1-peptide and mitoxantrone. Importantly, these data have allowed us to identify a new molecule that binds to TCPTP, but interestingly cannot activate its phosphatase activity. Accordingly, we describe here mechanism of TCPTP activation by mitoxantrone, the cytoplasmic tail of α1-integrin, and a mitoxantrone-like molecule at the atomic level. These data provide invaluable insight into the development of novel TCPTP activators, and may facilitate the rational discovery of small-molecule cancer therapeutics.
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Affiliation(s)
- Mikko Ylilauri
- Department of Biological and Environmental Science & Nanoscience Center, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
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Nishiyama-Fujita Y, Shimizu T, Sagawa M, Uchida H, Kizaki M. The role of TC-PTP (PTPN2) in modulating sensitivity to imatinib and interferon-α in CML cell line, KT-1 cells. Leuk Res 2013; 37:1150-5. [PMID: 23759247 DOI: 10.1016/j.leukres.2013.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 04/03/2013] [Accepted: 05/07/2013] [Indexed: 12/20/2022]
Abstract
T-cell protein tyrosine phosphatase (TC-PTP, also known as PTPN2) is a negative regulator of the JAK/STAT pathway. STAT5 is activated by BCR-ABL kinase and STAT1 is an important transcription factor for interferon (IFN)-α-induced signaling in chronic myeloid leukemia (CML). We used siRNA to delete TC-PTP in the CML cell line, KT-1, and examined changes in the sensitivity to imatinib and IFN-α. Suppression of TC-PTP induced activation of STAT5, leading to imatinib resistance, while prolonged phosphorylation of STAT1 was induced by IFN-α, triggering cell death in KT-1 cells. These findings suggest that TC-PTP modulates sensitivity to imatinib and IFN-α in CML.
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36
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O'Donovan DS, MacFhearraigh S, Whitfield J, Swigart LB, Evan GI, Mc Gee MM. Sequential Cdk1 and Plk1 phosphorylation of protein tyrosine phosphatase 1B promotes mitotic cell death. Cell Death Dis 2013; 4:e468. [PMID: 23348582 PMCID: PMC3563996 DOI: 10.1038/cddis.2012.208] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 11/09/2012] [Accepted: 11/12/2012] [Indexed: 01/20/2023]
Abstract
Mitotic cell death following prolonged arrest is an important death mechanism that is not completely understood. This study shows that Protein Tyrosine Phosphatase 1B (PTP1B) undergoes phosphorylation during mitotic arrest induced by microtubule-targeting agents (MTAs) in chronic myeloid leukaemia cells. Inhibition of cyclin-dependent kinase 1 (Cdk1) or polo-like kinase 1 (Plk1) during mitosis prevents PTP1B phosphorylation, implicating these kinases in PTP1B phosphorylation. In support of this, Cdk1 and Plk1 co-immunoprecipitate with endogenous PTP1B from mitotic cells. In addition, active recombinant Cdk1-cyclin B1 directly phosphorylates PTP1B at serine 386 in a kinase assay. Recombinant Plk1 phosphorylates PTP1B on serine 286 and 393 in vitro, however, it requires a priming phosphorylation by Cdk1 at serine 386 highlighting a novel co-operation between Cdk1 and Plk1 in the regulation of PTP1B. Furthermore, overexpression of wild-type PTP1B induced mitotic cell death, which is potentiated by MTAs. Moreover, mutation of serine 286 abrogates the cell death induced by PTP1B, whereas mutation of serine 393 does not, highlighting the importance of serine 286 phosphorylation in the execution of mitotic cell death. Finally, phosphorylation on serine 286 enhanced PTP1B phosphatase activity. Collectively, these data reveal that PTP1B activity promotes mitotic cell death and is regulated by the co-operative action of Cdk1 and Plk1 during mitotic arrest.
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Affiliation(s)
- D S O'Donovan
- UCD School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
| | - S MacFhearraigh
- UCD School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
| | - J Whitfield
- Department of Pathology and Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94143, USA
| | - L B Swigart
- Department of Pathology and Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94143, USA
| | - G I Evan
- Department of Pathology and Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94143, USA
| | - M M Mc Gee
- UCD School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
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37
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The nucleus- and endoplasmic reticulum-targeted forms of protein tyrosine phosphatase 61F regulate Drosophila growth, life span, and fecundity. Mol Cell Biol 2013; 33:1345-56. [PMID: 23339871 DOI: 10.1128/mcb.01411-12] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The protein tyrosine phosphatases (PTPs) T cell PTP (TCPTP) and PTP1B share a high level of catalytic domain sequence and structural similarity yet display distinct differences in substrate recognition and function. Their noncatalytic domains contribute to substrate selectivity and function by regulating TCPTP nucleocytoplasmic shuttling and targeting PTP1B to the endoplasmic reticulum (ER). The Drosophila TCPTP/PTP1B orthologue PTP61F has two variants with identical catalytic domains that are differentially targeted to the ER and nucleus. Here we demonstrate that the PTP61F variants differ in their ability to negatively regulate insulin signaling in vivo, with the nucleus-localized form (PTP61Fn) being more effective than the ER-localized form (PTP61Fm). We report that PTP61Fm is reliant on the adaptor protein Dock to attenuate insulin signaling in vivo. Also, we show that the PTP61F variants differ in their capacities to regulate growth, with PTP61Fn but not PTP61Fm attenuating cellular proliferation. Furthermore, we generate a mutant lacking both PTP61F variants, which displays a reduction in median life span and a decrease in female fecundity, and show that both variants are required to rescue these mutant phenotypes. Our findings define the role of PTP61F in life span and fecundity and reinforce the importance of subcellular localization in mediating PTP function in vivo.
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38
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Muppirala M, Gupta V, Swarup G. Emerging role of tyrosine phosphatase, TCPTP, in the organelles of the early secretory pathway. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1833:1125-32. [PMID: 23328081 DOI: 10.1016/j.bbamcr.2013.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 01/04/2013] [Accepted: 01/08/2013] [Indexed: 01/21/2023]
Abstract
T-cell protein tyrosine phosphatase, TCPTP, is a ubiquitously expressed non-receptor type tyrosine phosphatase. There are two splice variants of TCPTP, TC48 and TC45, which differ in their sub-cellular localizations and functions. TC45 is a nuclear protein, which has both nuclear and cytoplasmic substrates, and is involved in many signaling events including endocytic recycling of platelet-derived growth factor β-receptor. TC48 is a predominantly endoplasmic reticulum (ER)-localizing protein, which dephosphorylates some of the substrates of TC45 at the ER. However, recently few specific substrates for TC48 have been identified. These include C3G (RapGEF1), syntaxin 17 and BCR-Abl. TC48 moves from the ER to post-ER compartments, the ER-Golgi intermediate compartment (ERGIC) and Golgi, and it is retrieved back to the ER. The retrieval of ER proteins from post-ER compartments is generally believed as a mechanism of targeting these proteins to the ER. However, it is possible that this shuttling of TC48 serves to regulate signaling in the early secretory pathway. For example, TC48 dephosphorylates phosphorylated C3G at the Golgi and inhibits neurite outgrowth. TC48 interacts with and dephosphorylates syntaxin 17, which is an ER and ERGIC-localizing protein involved in vesicle transport. A yeast two-hybrid screen identified several unique interacting partners of TC48 belonging to two groups - proteins involved in vesicle trafficking and proteins involved in cell adhesion. These interacting proteins could be substrates or regulators of TC48 function and localization. Thus, the role of TC48 seems to be more diverse, which is still to be explored.
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Affiliation(s)
- Madhavi Muppirala
- Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Hyderabad, India
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39
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Cerosaletti K, Buckner JH. Protein tyrosine phosphatases and type 1 diabetes: genetic and functional implications of PTPN2 and PTPN22. Rev Diabet Stud 2012; 9:188-200. [PMID: 23804260 DOI: 10.1900/rds.2012.9.188] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Protein tyrosine phosphatases (PTPs) play a central role in modulating the transduction of cellular signals, including the cells of the immune system. Several PTPs, PTPN22, PTPN2, and UBASH3A, have been associated with risk of type 1 diabetes (T1D) by genome wide association studies. Based on the current understanding of PTPs, it is clear that these variants impact antigen receptor signaling and cytokine signaling. This impact likely contributes to the development and progression of autoimmunity through multiple mechanisms, including failures of central and peripheral tolerance and the promotion of proinflammatory T cell responses. In this review, we discuss the genetic and functional implications of two of these PTPs, PTPN22 and PTPN2, in the development of T1D. We describe the known roles of these proteins in immune function, and how the expression and function of these proteins is altered by the genetic variants associated with T1D. Yet, there are still controversies in the field that require further study and the development of new approaches to extend our understanding of these PTP variants, with the goal of using the information gained to improve our ability to predict and cure T1D.
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Affiliation(s)
- Karen Cerosaletti
- Translational Research Program, Benaroya Research Institute at Virginia Mason, Seattle, WA 98101, USA
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40
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The tyrosine phosphatase TC48 interacts with and inactivates the oncogenic fusion protein BCR-Abl but not cellular Abl. Biochim Biophys Acta Mol Basis Dis 2012; 1832:275-84. [PMID: 23124138 DOI: 10.1016/j.bbadis.2012.10.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 10/25/2012] [Accepted: 10/26/2012] [Indexed: 11/20/2022]
Abstract
The chimeric oncoprotein BCR-Abl exhibits deregulated protein tyrosine kinase activity and is responsible for the pathogenesis of certain human leukemias, such as chronic myelogenous leukemia. The activities of cellular Abl (c-Abl) and BCR-Abl are stringently regulated and the cellular mechanisms involved in their inactivation are poorly understood. Protein tyrosine phosphatases can negatively regulate Abl mediated signaling by dephosphorylating the kinase and/or its substrates. This study investigated the ability of the intracellular T cell protein tyrosine phosphatase (TCPTP/PTPN2) to dephosphorylate and regulate the functions of BCR-Abl and c-Abl. TCPTP is expressed as two alternately spliced isoforms - TC48 and TC45, which differ in their C-termini and localize to the cytoplasm and nucleus respectively. We show that TC48 dephosphorylates BCR-Abl but not c-Abl and inhibits its activity towards its substrate, CrkII. Y1127 and Y1294 residues whose phosphorylation corresponds with BCR-Abl activation status were the primary sites targeted by TC48. Co-localization and immunoprecipitation experiments showed that TC48 interacted with BCR-Abl but not with c-Abl, and BCR domain was sufficient for interaction. TC48 expression resulted in the stabilization of Bcr-Abl protein dependent on its phosphatase activity. Inactivation of cellular TC48 in K562 cells by stable expression of a dominant negative catalytically inactive mutant TC48, enhanced proliferation. TC48 expressing K562 clones showed reduced proliferation and enhanced sensitivity to STI571 compared to control clones suggesting that TC48 can repress the growth of CML cells. This study identifies a novel cellular regulator that specifically inhibits the activity of oncogenic BCR-Abl but not that of the cellular Abl kinase.
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41
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Labbé DP, Hardy S, Tremblay ML. Protein tyrosine phosphatases in cancer: friends and foes! PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2012; 106:253-306. [PMID: 22340721 DOI: 10.1016/b978-0-12-396456-4.00009-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Tyrosine phosphorylation of proteins serves as an exquisite switch in controlling several key oncogenic signaling pathways involved in cell proliferation, apoptosis, migration, and invasion. Since protein tyrosine phosphatases (PTPs) counteract protein kinases by removing phosphate moieties on target proteins, one may intuitively think that PTPs would act as tumor suppressors. Indeed, one of the most described PTPs, namely, the phosphatase and tensin homolog (PTEN), is a tumor suppressor. However, a growing body of evidence suggests that PTPs can also function as potent oncoproteins. In this chapter, we provide a broad historical overview of the PTPs, their mechanism of action, and posttranslational modifications. Then, we focus on the dual properties of classical PTPs (receptor and nonreceptor) and dual-specificity phosphatases in cancer and summarize the current knowledge of the signaling pathways regulated by key PTPs in human cancer. In conclusion, we present our perspective on the potential of these PTPs to serve as therapeutic targets in cancer.
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Affiliation(s)
- David P Labbé
- Goodman Cancer Research Centre, McGill University, Montréal, Québec, Canada
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42
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Wiede F, Chew SH, van Vliet C, Poulton IJ, Kyparissoudis K, Sasmono T, Loh K, Tremblay ML, Godfrey DI, Sims NA, Tiganis T. Strain-dependent differences in bone development, myeloid hyperplasia, morbidity and mortality in ptpn2-deficient mice. PLoS One 2012; 7:e36703. [PMID: 22590589 PMCID: PMC3348136 DOI: 10.1371/journal.pone.0036703] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Accepted: 04/05/2012] [Indexed: 12/14/2022] Open
Abstract
Single nucleotide polymorphisms in the gene encoding the protein tyrosine phosphatase TCPTP (encoded by PTPN2) have been linked with the development of autoimmunity. Here we have used Cre/LoxP recombination to generate Ptpn2(ex2-/ex2-) mice with a global deficiency in TCPTP on a C57BL/6 background and compared the phenotype of these mice to Ptpn2(-/-) mice (BALB/c-129SJ) generated previously by homologous recombination and backcrossed onto the BALB/c background. Ptpn2(ex2-/ex2-) mice exhibited growth retardation and a median survival of 32 days, as compared to 21 days for Ptpn2(-/-) (BALB/c) mice, but the overt signs of morbidity (hunched posture, piloerection, decreased mobility and diarrhoea) evident in Ptpn2(-/-) (BALB/c) mice were not detected in Ptpn2(ex2-/ex2-) mice. At 14 days of age, bone development was delayed in Ptpn2(-/-) (BALB/c) mice. This was associated with increased trabecular bone mass and decreased bone remodeling, a phenotype that was not evident in Ptpn2(ex2-/ex2-) mice. Ptpn2(ex2-/ex2-) mice had defects in erythropoiesis and B cell development as evident in Ptpn2(-/-) (BALB/c) mice, but not splenomegaly and did not exhibit an accumulation of myeloid cells in the spleen as seen in Ptpn2(-/-) (BALB/c) mice. Moreover, thymic atrophy, another feature of Ptpn2(-/-) (BALB/c) mice, was delayed in Ptpn2(ex2-/ex2-) mice and preceded by an increase in thymocyte positive selection and a concomitant increase in lymph node T cells. Backcrossing Ptpn2(-/-) (BALB/c) mice onto the C57BL/6 background largely recapitulated the phenotype of Ptpn2(ex2-/ex2-) mice. Taken together these results reaffirm TCPTP's important role in lymphocyte development and indicate that the effects on morbidity, mortality, bone development and the myeloid compartment are strain-dependent.
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Affiliation(s)
- Florian Wiede
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Sock Hui Chew
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Catherine van Vliet
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | | | | | - Tedjo Sasmono
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Kim Loh
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Michel L. Tremblay
- McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada
| | - Dale I. Godfrey
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
| | - Natalie A. Sims
- St. Vincent's Institute of Medical Research, Victoria, Australia
| | - Tony Tiganis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
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43
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Abstract
Insulin resistance is a key pathological feature of type 2 diabetes and is characterized by defects in signaling by the insulin receptor (IR) protein tyrosine kinase. The inhibition of protein tyrosine phosphatases (PTPs) that antagonize IR signaling may provide a means for enhancing the insulin response and alleviating insulin resistance. The prototypic phosphotyrosine-specific phosphatase PTP1B dephosphorylates the IR and attenuates insulin signaling in muscle and liver. Mice that are deficient for PTP1B exhibit improved glucose homeostasis in diet and genetic models of insulin resistance and type 2 diabetes. The phosphatase TCPTP shares 72% catalytic domain sequence identity with PTP1B and has also been implicated in IR regulation. Despite their high degree of similarity, PTP1B and TCPTP act together in vitro and in vivo to regulate insulin signaling and glucose homeostasis. This review highlights their capacity to act specifically and nonredundantly in cellular signaling, describes their roles in IR regulation and glucose homeostasis, and discusses their potential as drug targets for the enhancement of IR phosphorylation and insulin sensitivity in type 2 diabetes.
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Affiliation(s)
- Tony Tiganis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Australia.
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44
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Wiede F, Shields BJ, Chew SH, Kyparissoudis K, van Vliet C, Galic S, Tremblay ML, Russell SM, Godfrey DI, Tiganis T. T cell protein tyrosine phosphatase attenuates T cell signaling to maintain tolerance in mice. J Clin Invest 2011; 121:4758-74. [PMID: 22080863 PMCID: PMC3226006 DOI: 10.1172/jci59492] [Citation(s) in RCA: 158] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 10/07/2011] [Indexed: 12/14/2022] Open
Abstract
Many autoimmune diseases exhibit familial aggregation, indicating that they have genetic determinants. Single nucleotide polymorphisms in PTPN2, which encodes T cell protein tyrosine phosphatase (TCPTP), have been linked with the development of several autoimmune diseases, including type 1 diabetes and Crohn's disease. In this study, we have identified TCPTP as a key negative regulator of TCR signaling, which might explain the association of PTPN2 SNPs with autoimmune disease. We found that TCPTP dephosphorylates and inactivates Src family kinases to regulate T cell responses. Using T cell-specific TCPTP-deficient mice, we established that TCPTP attenuates T cell activation and proliferation in vitro and blunts antigen-induced responses in vivo. TCPTP deficiency lowered the in vivo threshold for TCR-dependent CD8(+) T cell proliferation. Consistent with this, T cell-specific TCPTP-deficient mice developed widespread inflammation and autoimmunity that was transferable to wild-type recipient mice by CD8(+) T cells alone. This autoimmunity was associated with increased serum levels of proinflammatory cytokines and anti-nuclear antibodies, T cell infiltrates in non-lymphoid tissues, and liver disease. These data indicate that TCPTP is a critical negative regulator of TCR signaling that sets the threshold for TCR-induced naive T cell responses to prevent autoimmune and inflammatory disorders arising.
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MESH Headings
- Animals
- Antibodies, Antinuclear/biosynthesis
- Autoimmune Diseases/enzymology
- Autoimmune Diseases/etiology
- Autoimmune Diseases/immunology
- CD8-Positive T-Lymphocytes/cytology
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/transplantation
- Immune Tolerance/immunology
- Inflammation/blood
- Inflammation/genetics
- Inflammation/immunology
- Lymphocyte Activation
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Phosphorylation
- Protein Processing, Post-Translational
- Protein Tyrosine Phosphatase, Non-Receptor Type 2/deficiency
- Protein Tyrosine Phosphatase, Non-Receptor Type 2/genetics
- Protein Tyrosine Phosphatase, Non-Receptor Type 2/physiology
- Radiation Chimera
- Receptors, Antigen, T-Cell/immunology
- Signal Transduction/immunology
- T-Lymphocyte Subsets/enzymology
- T-Lymphocyte Subsets/immunology
- Thymocytes/pathology
- ZAP-70 Protein-Tyrosine Kinase/physiology
- src-Family Kinases/metabolism
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Affiliation(s)
- Florian Wiede
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Benjamin J. Shields
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Sock Hui Chew
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Konstantinos Kyparissoudis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Catherine van Vliet
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Sandra Galic
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Michel L. Tremblay
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Sarah M. Russell
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Dale I. Godfrey
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Tony Tiganis
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
McGill Cancer Centre and Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Immune Signaling Laboratory, Cancer Immunology, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
Centre for MicroPhotonics, Swinburne University of Technology, Hawthorn, Victoria, Australia
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45
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Loh K, Fukushima A, Zhang X, Galic S, Briggs D, Enriori PJ, Simonds S, Wiede F, Reichenbach A, Hauser C, Sims NA, Bence KK, Zhang S, Zhang ZY, Kahn BB, Neel BG, Andrews ZB, Cowley MA, Tiganis T. Elevated hypothalamic TCPTP in obesity contributes to cellular leptin resistance. Cell Metab 2011; 14:684-99. [PMID: 22000926 PMCID: PMC3263335 DOI: 10.1016/j.cmet.2011.09.011] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 08/20/2011] [Accepted: 09/21/2011] [Indexed: 01/03/2023]
Abstract
In obesity, anorectic responses to leptin are diminished, giving rise to the concept of "leptin resistance." Increased expression of protein tyrosine phosphatase 1B (PTP1B) has been associated with the attenuation of leptin signaling and development of cellular leptin resistance. Here we report that hypothalamic levels of the tyrosine phosphatase TCPTP are also elevated in obesity to attenuate the leptin response. We show that mice that lack TCPTP in neuronal cells have enhanced leptin sensitivity and are resistant to high-fat-diet-induced weight gain and the development of leptin resistance. Also, intracerebroventricular administration of a TCPTP inhibitor enhances leptin signaling and responses in mice. Moreover, the combined deletion of TCPTP and PTP1B in neuronal cells has additive effects in the prevention of diet-induced obesity. Our results identify TCPTP as a critical negative regulator of hypothalamic leptin signaling and causally link elevated TCPTP to the development of cellular leptin resistance in obesity.
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Affiliation(s)
- Kim Loh
- Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
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46
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Kleppe M, Tousseyn T, Geissinger E, Kalender Atak Z, Aerts S, Rosenwald A, Wlodarska I, Cools J. Mutation analysis of the tyrosine phosphatase PTPN2 in Hodgkin's lymphoma and T-cell non-Hodgkin's lymphoma. Haematologica 2011; 96:1723-7. [PMID: 21791476 DOI: 10.3324/haematol.2011.041921] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
We recently reported deletion of the protein tyrosine phosphatase gene PTPN2 in T-cell acute lymphoblastic leukemia. Functional analyses confirmed that PTPN2 acts as classical tumor suppressor repressing the proliferation of T cells, in part through inhibition of JAK/STAT signaling. We investigated the expression of PTPN2 in leukemia as well as lymphoma cell lines. We identified bi-allelic inactivation of PTPN2 in the Hodgkin's lymphoma cell line SUP-HD1 which was associated with activation of the JAK/STAT pathway. Subsequent sequence analysis of Hodgkin's lymphoma and T-cell non-Hodgkin's lymphoma identified bi-allelic inactivation of PTPN2 in 2 out of 39 cases of peripheral T-cell lymphoma not otherwise specified, but not in Hodgkin's lymphoma. These results, together with our own data on T-cell acute lymphoblastic leukemia, demonstrate that PTPN2 is a tumor suppressor gene in T-cell malignancies.
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Affiliation(s)
- Maria Kleppe
- Department of Molecular and Developmental Genetics, VIB, Leuven, Belgium
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47
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PTPN2 negatively regulates oncogenic JAK1 in T-cell acute lymphoblastic leukemia. Blood 2011; 117:7090-8. [PMID: 21551237 DOI: 10.1182/blood-2010-10-314286] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
We have recently reported inactivation of the tyrosine phosphatase PTPN2 (also known as TC-PTP) through deletion of the entire gene locus in ∼ 6% of T-cell acute lymphoblastic leukemia (T-ALL) cases. T-ALL is an aggressive disease of the thymocytes characterized by the stepwise accumulation of chromosomal abnormalities and gene mutations. In the present study, we confirmed the strong association of the PTPN2 deletion with TLX1 and NUP214-ABL1 expression. In addition, we found cooperation between PTPN2 deletion and activating JAK1 gene mutations. Activating mutations in JAK1 kinase occur in ∼ 10% of human T-ALL cases, and aberrant kinase activity has been shown to confer proliferation and survival advantages. Our results reveal that some JAK1 mutation-positive T-ALLs harbor deletions of the tyrosine phosphatase PTPN2, a known negative regulator of the JAK/STAT pathway. We provide evidence that down-regulation of Ptpn2 sensitizes lymphoid cells to JAK1-mediated transformation and reduces their sensitivity to JAK inhibition.
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Lu X, Kazmierczak K, Jiang X, Jones M, Watt J, Helfman DM, Moore JR, Szczesna-Cordary D, Lossos IS. Germinal center-specific protein human germinal center associated lymphoma directly interacts with both myosin and actin and increases the binding of myosin to actin. FEBS J 2011; 278:1922-31. [PMID: 21447067 DOI: 10.1111/j.1742-4658.2011.08109.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Human germinal center associated lymphoma (HGAL) is a germinal center-specific gene whose expression correlates with a favorable prognosis in patients with diffuse large B-cell and classic Hodgkin lymphomas. HGAL is involved in negative regulation of lymphocyte motility. The movement of lymphocytes is directly driven by actin polymerization and actin-myosin interactions. We demonstrate that HGAL interacts directly and independently with both actin and myosin and delineate the HGAL and myosin domains responsible for the interaction. Furthermore, we show that HGAL increases the binding of myosin to F-actin and inhibits the ability of myosin to translocate actin by reducing the maximal velocity of myosin head/actin movement. No effects of HGAL on actomyosin ATPase activity and the rate of actin polymerization from G-actin to F-actin were observed. These findings reveal a new mechanism underlying the inhibitory effects of germinal center-specific HGAL protein on lymphocyte and lymphoma cell motility.
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Affiliation(s)
- Xiaoqing Lu
- Division of Oncology-Hematology, Department of Medicine, Sylvester Comprehensive Cancer Center, University of Miami, FL 33136, USA
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Dong L, Zhang X, Fu X, Zhang X, Gao X, Zhu M, Wang X, Yang Z, Jensen ON, Saarikettu J, Yao Z, Silvennoinen O, Yang J. PTB-associated splicing factor (PSF) functions as a repressor of STAT6-mediated Ig epsilon gene transcription by recruitment of HDAC1. J Biol Chem 2010; 286:3451-9. [PMID: 21106524 DOI: 10.1074/jbc.m110.168377] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Regulation of transcription requires cooperation between sequence-specific transcription factors and numerous coregulatory proteins. In IL-4/IL-13 signaling several coactivators for STAT6 have been identified, but the molecular mechanisms of STAT6-mediated gene transcription are still not fully understood. Here we identified by proteomic approach that the PTB-associated splicing factor (PSF) interacts with STAT6. In intact cells the interaction was observed only after IL-4 stimulation. The IL-4-induced tyrosine phosphorylation of both STAT6 and PSF is a prerequisite for the efficient association of the two proteins. Functional analysis demonstrated that ectopic expression of PSF resulted in inhibition of STAT6-mediated transcriptional activation and mRNA expression of the Igε germline heavy chain gene, whereas knockdown of PSF increased the STAT6-mediated responses. PSF recruited histone deacetylase 1 (HDAC1) to the STAT6 transcription complex, which resulted in reduction of H3 acetylation at the promoter regions of Ig heavy chain germline Igε and inhibition of STAT6-mediated transcription. In addition, the HDACs inhibitor trichostatin A (TSA) enhanced H3 acetylation, and reverted the PSF-mediated transcriptional repression of Igε gene transcription. In summary, these results identify PSF as a repressor of STAT6-mediated transcription that functions through recruitment of HDAC to the STAT6 transcription complex, and delineates a novel regulatory mechanism of IL-4 signaling that may have implications in the pathogenesis of allergic diseases and pharmacological HDAC inhibition in lymphomas.
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Affiliation(s)
- Lijie Dong
- Department of Immunology, Basic Medical College, Tianjin Medical University, Heping District, Qixiangtai Road No. 22, Tianjin 300070, China
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HGAL, a germinal center specific protein, decreases lymphoma cell motility by modulation of the RhoA signaling pathway. Blood 2010; 116:5217-27. [PMID: 20844236 DOI: 10.1182/blood-2010-04-281568] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
HGAL is a germinal center (GC)-specific gene that negatively regulates lymphocyte motility and whose expression predicts improved survival of patients with diffuse large B-cell lymphoma (DLBCL) and classical Hodgkin lymphoma (cHL). We demonstrate that HGAL serves as a regulator of the RhoA signaling pathway. HGAL enhances activation of RhoA and its down-stream effectors by a novel mechanism - direct binding to the catalytic DH-domain of the RhoA-specific guanine nucleotide exchange factors (RhoGEFs) PDZ-RhoGEF and LARG that stimulate the GDP-GTP exchange rate of RhoA. We delineate the structural domain of HGAL that mediates its interaction with the PDZ-RhoGEF protein. These observations reveal a novel molecular mechanism underlying the inhibitory effects of GC-specific HGAL protein on the motility of GC-derived lymphoma cells. This mechanism may underlie the limited dissemination and better outcome of patients with HGAL-expressing DLBCL and cHL.
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