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Sun D, Qi X, Wen H, Li C, Li J, Chen J, Tao Z, Zhu M, Zhang X, Li Y. The genetic basis and potential molecular mechanism of yellow-albino northern snakehead ( Channa argus). Open Biol 2023; 13:220235. [PMID: 36789536 PMCID: PMC9929503 DOI: 10.1098/rsob.220235] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Body colour is an important economic trait for commercial fishes. Recently, a new colour morph displaying market-favoured yellow skin (termed as yellow-mutant, YM) of northern snakehead (Channa argus) was discovered in China. We confirmed that YM snakehead is an albino with complete loss of melanin in the skin and eyes by histological and ultrastructural observations, and inherited as a recessive Mendelian trait. By applying genomic analysis approaches, in combination with gene knockdown and rescue experiments, we suggested a non-sense mutation in slc45a2 (c.383G > A) is the causation for the YM snakehead. Notably, significantly higher levels of key melanogenesis genes (tyr, tyrp1, dct and pmel) and phospho-MITF protein were detected in YM snakehead than those in wild-type individuals, and the underlying mechanism was further investigated by comparative transcriptomic analysis. Results revealed that differential expressed genes involved in pathways like MAPK, WNT and calcium signalling were significantly induced in YM snakehead, which might account for the increased amount of melanogenesis elements, and presumably be stimulated by fibroblast-derived melanogenic factors in a paracrine manner. Our study clarified the genetic basis of colour variation in C. argus and provided the preliminary clue indicating the potential involvement of fibroblasts in pigmentation in fish.
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Affiliation(s)
- Donglei Sun
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Xin Qi
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Haishen Wen
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Chao Li
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Jianlong Li
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Jiwei Chen
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Zexin Tao
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Mingxin Zhu
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
| | - Xiaoyan Zhang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Yun Li
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education (KLMME), Fisheries College, Ocean University of China, Qingdao 266003, People's Republic of China
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Hosseinalizadeh H, Mohamadzadeh O, Kahrizi MS, Razaghi Bahabadi Z, Klionsky DJ, Mirzei H. TRIM8: a double-edged sword in glioblastoma with the power to heal or hurt. Cell Mol Biol Lett 2023; 28:6. [PMID: 36690946 PMCID: PMC9869596 DOI: 10.1186/s11658-023-00418-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Accepted: 01/05/2023] [Indexed: 01/24/2023] Open
Abstract
Glioblastoma multiforme (GBM) is an aggressive primary brain tumor and one of the most lethal central nervous system tumors in adults. Despite significant breakthroughs in standard treatment, only about 5% of patients survive 5 years or longer. Therefore, much effort has been put into the search for identifying new glioma-associated genes. Tripartite motif-containing (TRIM) family proteins are essential regulators of carcinogenesis. TRIM8, a member of the TRIM superfamily, is abnormally expressed in high-grade gliomas and is associated with poor clinical prognosis in patients with glioma. Recent research has shown that TRIM8 is a molecule of duality (MoD) that can function as both an oncogene and a tumor suppressor gene, making it a "double-edged sword" in glioblastoma development. This characteristic is due to its role in selectively regulating three major cellular signaling pathways: the TP53/p53-mediated tumor suppression pathway, NFKB/NF-κB, and the JAK-STAT pathway essential for stem cell property support in glioma stem cells. In this review, TRIM8 is analyzed in detail in the context of GBM and its involvement in essential signaling and stem cell-related pathways. We also discuss the basic biological activities of TRIM8 in macroautophagy/autophagy, regulation of bipolar spindle formation and chromosomal stability, and regulation of chemoresistance, and as a trigger of inflammation.
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Affiliation(s)
- Hamed Hosseinalizadeh
- grid.411874.f0000 0004 0571 1549Department of Medical Biotechnology, Faculty of Paramedicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Omid Mohamadzadeh
- grid.411705.60000 0001 0166 0922Department of Neurosurgery, Tehran University of Medical Science, Tehran, Iran
| | - Mohammad Saeed Kahrizi
- grid.411705.60000 0001 0166 0922Department of Surgery, Alborz University of Medical Sciences, Karaj, Alborz Iran
| | - Zahra Razaghi Bahabadi
- grid.444768.d0000 0004 0612 1049School of Medicine, Kashan University of Medical Sciences, Kashan, Iran ,grid.444768.d0000 0004 0612 1049Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
| | - Daniel J. Klionsky
- grid.214458.e0000000086837370Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI USA
| | - Hamed Mirzei
- grid.444768.d0000 0004 0612 1049Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
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Liu N, Chen Y, Yang L, Shi Q, Lu Y, Ma W, Han X, Guo H, Li D, Gan W. Both SUMOylation and ubiquitination of TFE3 fusion protein regulated by androgen receptor are the potential target in the therapy of Xp11.2 translocation renal cell carcinoma. Clin Transl Med 2022; 12:e797. [PMID: 35452181 PMCID: PMC9029019 DOI: 10.1002/ctm2.797] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 03/14/2022] [Accepted: 03/18/2022] [Indexed: 01/06/2023] Open
Abstract
Background The aggressiveness of renal cell carcinoma (RCC) associated with Xp11.2 translocation/TFE3 gene fusion (Xp11.2 translocation RCC [Xp11.2 tRCC]) is age‐dependent, which is similar to the overall trend of reproductive endocrine hormones. Therefore, this study focused on the effect and potential mechanism of androgen and androgen receptor (AR) on the progression of Xp11.2 tRCC. Methods The effects of androgen and AR on the proliferation and migration of Xp11.2 tRCC cells were first evaluated utilising Xp11.2 tRCC cell lines and tissues. Because Transcription factor enhancer 3 (TFE3) fusion proteins play a key role in Xp11.2 tRCC, we focused on the regulatory role of AR and TFE3 expression and transcriptional activity. Results When Xp11.2 tRCC cells were treated with dihydrotestosterone, increased cell proliferation, invasion and migration were observed. Compared with clear cell RCC, the positive rate of AR in Xp11.2 tRCC tissues was higher, and its expression was negatively associated with the progression‐free survival of Xp11.2 tRCC. Further studies revealed that AR could positively regulate the transcriptional activity of TFE3 fusion proteins by small ubiquitin‐related modifier (SUMO)‐specific protease 1, inducing the deSUMOylation of TFE3 fusion. On the other hand, UCHL1 negatively regulated by AR plays a role in the deubiquitination degradation of the PRCC‐TFE3 fusion protein. Therefore, the combination of the AR inhibitor MDV3100 and the UCHL1 inhibitor 6RK73 was effective in delaying the progression of Xp11.2 tRCC, especially PRCC‐TFE3 tRCC. Conclusions Androgen and AR function as facilitators in Xp11.2 tRCC progression and may be a novel therapeutic target for Xp11.2 tRCC. The combined use of AR antagonist MDV3100 and UCHL1 inhibitor 6RK73 increased both the SUMOylation and ubiquitination of the PRCC‐TFE3 fusion protein
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Affiliation(s)
- Ning Liu
- Department of Urology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, Jiangsu, China
| | - Yi Chen
- Immunology and Reproduction Biology Laboratory & State Key Laboratory of Analytical Chemistry for Life Science, Medical School, Nanjing University, Nanjing, Jiangsu, China.,Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, Jiangsu, China
| | - Lei Yang
- Immunology and Reproduction Biology Laboratory & State Key Laboratory of Analytical Chemistry for Life Science, Medical School, Nanjing University, Nanjing, Jiangsu, China.,Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, Jiangsu, China
| | - Qiancheng Shi
- Department of Urology, Affiliated Sir Run Run Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yanwen Lu
- Department of Urology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, Jiangsu, China
| | - Wenliang Ma
- Department of Urology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, Jiangsu, China
| | - Xiaodong Han
- Immunology and Reproduction Biology Laboratory & State Key Laboratory of Analytical Chemistry for Life Science, Medical School, Nanjing University, Nanjing, Jiangsu, China.,Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, Jiangsu, China
| | - Hongqian Guo
- Department of Urology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, Jiangsu, China
| | - Dongmei Li
- Immunology and Reproduction Biology Laboratory & State Key Laboratory of Analytical Chemistry for Life Science, Medical School, Nanjing University, Nanjing, Jiangsu, China.,Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, Jiangsu, China
| | - Weidong Gan
- Department of Urology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, Jiangsu, China
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Srivastava M, Kaplan MH. Transcription Factors in the Development and Pro-Allergic Function of Mast Cells. FRONTIERS IN ALLERGY 2021; 2:679121. [PMID: 35387064 PMCID: PMC8974754 DOI: 10.3389/falgy.2021.679121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/12/2021] [Indexed: 11/13/2022] Open
Abstract
Mast cells (MCs) are innate immune cells of hematopoietic origin localized in the mucosal tissues of the body and are broadly implicated in the pathogenesis of allergic inflammation. Transcription factors have a pivotal role in the development and differentiation of mast cells in response to various microenvironmental signals encountered in the resident tissues. Understanding the regulation of mast cells by transcription factors is therefore vital for mechanistic insights into allergic diseases. In this review we summarize advances in defining the transcription factors that impact the development of mast cells throughout the body and in specific tissues, and factors that are involved in responding to the extracellular milieu. We will further describe the complex networks of transcription factors that impact mast cell physiology and expansion during allergic inflammation and functions from degranulation to cytokine secretion. As our understanding of the heterogeneity of mast cells becomes more detailed, the contribution of specific transcription factors in mast cell-dependent functions will potentially offer new pathways for therapeutic targeting.
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Affiliation(s)
- Mansi Srivastava
- Department of BioHealth Informatics, School of Informatics and Computing, Indiana University-Purdue University, Indianapolis, IN, United States
| | - Mark H. Kaplan
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN, United States
- *Correspondence: Mark H. Kaplan
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Oppezzo A, Rosselli F. The underestimated role of the microphthalmia-associated transcription factor (MiTF) in normal and pathological haematopoiesis. Cell Biosci 2021; 11:18. [PMID: 33441180 PMCID: PMC7805242 DOI: 10.1186/s13578-021-00529-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 01/03/2021] [Indexed: 12/12/2022] Open
Abstract
Haematopoiesis, the process by which a restrained population of stem cells terminally differentiates into specific types of blood cells, depends on the tightly regulated temporospatial activity of several transcription factors (TFs). The deregulation of their activity or expression is a main cause of pathological haematopoiesis, leading to bone marrow failure (BMF), anaemia and leukaemia. TFs can be induced and/or activated by different stimuli, to which they respond by regulating the expression of genes and gene networks. Most TFs are highly pleiotropic; i.e., they are capable of influencing two or more apparently unrelated phenotypic traits, and the action of a single TF in a specific setting often depends on its interaction with other TFs and signalling pathway components. The microphthalmia-associated TF (MiTF) is a prototype TF in multiple situations. MiTF has been described extensively as a key regulator of melanocyte and melanoma development because it acts mainly as an oncogene. Mitf-mutated mice show a plethora of pleiotropic phenotypes, such as microphthalmia, deafness, abnormal pigmentation, retinal degeneration, reduced mast cell numbers and osteopetrosis, revealing a greater requirement for MiTF activity in cells and tissue. A growing amount of evidence has led to the delineation of key roles for MiTF in haematopoiesis and/or in cells of haematopoietic origin, including haematopoietic stem cells, mast cells, NK cells, basophiles, B cells and osteoclasts. This review summarizes several roles of MiTF in cells of the haematopoietic system and how MiTFs can impact BM development.
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Affiliation(s)
- Alessia Oppezzo
- CNRS UMR9019, Équipe labellisée La Ligue contre le Cancer, Gustave Roussy, 114 rue Edouard Vaillant, 94805, Villejuif, France. .,Gustave Roussy Cancer Center, 94805, Villejuif, France. .,Université Paris Saclay - Paris Sud, Orsay, France.
| | - Filippo Rosselli
- CNRS UMR9019, Équipe labellisée La Ligue contre le Cancer, Gustave Roussy, 114 rue Edouard Vaillant, 94805, Villejuif, France. .,Gustave Roussy Cancer Center, 94805, Villejuif, France. .,Université Paris Saclay - Paris Sud, Orsay, France.
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Involvement of adenylate cyclase/cAMP/CREB and SOX9/MITF in melanogenesis to prevent vitiligo. Mol Cell Biochem 2021; 476:1401-1409. [PMID: 33389492 DOI: 10.1007/s11010-020-04000-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/20/2020] [Indexed: 10/22/2022]
Abstract
Vitiligo is autoimmune, acquired, idiopathic, chronic, and progressive de/hypopigmentary cutaneous condition that targets the cell-producing pigment called melanin. It binds to a thread of great disappointment and emotional stress in societies. Combining multiple stress-related theories like toxic compound accumulation, autoimmunity, mutations, altered cellular environment, infection, impaired migration/proliferation, and immunological mismatch of anti-melanocyte and self-reactive T-cells that cause melanocytes damage is formulated resulting in vitiligo. Vitiligo has an orphan status for drug synthesis. Still, different therapies are available, with topical steroids and narrow-band ultraviolet-B monotherapy being the most common treatments, others including medical, physical, or surgical, but not effective. Each modality has its baggage of disadvantages and side effects. Stimulation of the transcriptional process for melanogenesis is mainly achieved by the cAMP-dependent activation of several melanogenic genes by MITF. In this review, we summarized that cAMP encourages the expression of the enzyme tyrosinase, TYRP1, TYRP2, and most other biological effects of cAMP are mediated through the cAMP-dependent PKA pathway resulting in CREB phosphorylation. It has been shown that TYRP1 and 2 do not have cAMP response elements (CREs) in promoting regions; the regulation of these genes by cAMP occurs through the direct participation of MITF during melanogenesis. The available medicines, therefore, only provide symptomatic relief, but do not stop the disease progression. In addition, the treatment process needs to be changed; existing approaches need to be overlooked for patients who are suffering and therefore analyze its efficacy and safety to achieve a favorable risk-benefit ratio.
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Mohan CD, Rangappa S, Preetham HD, Chandra Nayaka S, Gupta VK, Basappa S, Sethi G, Rangappa KS. Targeting STAT3 signaling pathway in cancer by agents derived from Mother Nature. Semin Cancer Biol 2020; 80:157-182. [DOI: 10.1016/j.semcancer.2020.03.016] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 03/23/2020] [Accepted: 03/28/2020] [Indexed: 02/07/2023]
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Trivedi A, Mehrotra A, Baum CE, Lewis B, Basuroy T, Blomquist T, Trumbly R, Filipp FV, Setaluri V, de la Serna IL. Bromodomain and extra-terminal domain (BET) proteins regulate melanocyte differentiation. Epigenetics Chromatin 2020; 13:14. [PMID: 32151278 PMCID: PMC7063807 DOI: 10.1186/s13072-020-00333-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 02/19/2020] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Pharmacologic inhibition of bromodomain and extra-terminal (BET) proteins is currently being explored as a new therapeutic approach in cancer. Some studies have also implicated BET proteins as regulators of cell identity and differentiation through their interactions with lineage-specific factors. However, the role of BET proteins has not yet been investigated in melanocyte differentiation. Melanocyte inducing transcription factor (MITF) is the master regulator of melanocyte differentiation, essential for pigmentation and melanocyte survival. In this study, we tested the hypothesis that BET proteins regulate melanocyte differentiation through interactions with MITF. RESULTS Here we show that chemical inhibition of BET proteins prevents differentiation of unpigmented melanoblasts into pigmented melanocytes and results in de-pigmentation of differentiated melanocytes. BET inhibition also slowed cell growth, without causing cell death, increasing the number of cells in G1. Transcriptional profiling revealed that BET inhibition resulted in decreased expression of pigment-specific genes, including many MITF targets. The expression of pigment-specific genes was also down-regulated in melanoma cells, but to a lesser extent. We found that RNAi depletion of the BET family members, bromodomain-containing protein 4 (BRD4) and bromodomain-containing protein 2 (BRD2) inhibited expression of two melanin synthesis enzymes, TYR and TYRP1. Both BRD4 and BRD2 were detected on melanocyte promoters surrounding MITF-binding sites, were associated with open chromatin structure, and promoted MITF binding to these sites. Furthermore, BRD4 and BRD2 physically interacted with MITF. CONCLUSION These findings indicate a requirement for BET proteins in the regulation of pigmentation and melanocyte differentiation. We identified changes in pigmentation specific gene expression that occur upon BET inhibition in melanoblasts, melanocytes, and melanoma cells.
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Affiliation(s)
- Archit Trivedi
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
| | - Aanchal Mehrotra
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
- Present Address: Department of Genome Sciences, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195 USA
| | - Caitlin E. Baum
- Department of Pathology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
| | - Brandon Lewis
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
| | - Tupa Basuroy
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
- Present Address: Cancer Center Division, Massachusetts General Hospital Harvard Medical School, 149 Thirteenth Street, 7th Floor, Charlestown, MA 02129 USA
| | - Thomas Blomquist
- Department of Pathology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
| | - Robert Trumbly
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
| | - Fabian V. Filipp
- Cancer Systems Biology, Institute of Computational Biology, Helmholtz Zentrum München, Ingolstädter Landstraße 1, München, 85764 Germany
- School of Life Sciences Weihenstephan, Technical University München, Maximus-von-Imhof-Forum 3, Freising, 85354 Germany
| | - Vijayasaradhi Setaluri
- Department of Dermatology, University of Wisconsin-Madison, The School of Medicine and Public Health, 1 S. Park Street, Madison, WI 53715 USA
| | - Ivana L. de la Serna
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, 3035 Arlington Ave, Toledo, OH 43614 USA
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Zhong LX, Wu ML, Li H, Liu J, Lin LZ. Efficacy and safety of intraperitoneally administered resveratrol against rat orthotopic ovarian cancers. Cancer Manag Res 2019; 11:6113-6124. [PMID: 31456648 PMCID: PMC6620774 DOI: 10.2147/cmar.s206301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 05/25/2019] [Indexed: 01/09/2023] Open
Abstract
Background Resveratrol (Res) inhibits ovarian cancer (OC) cell growth but its in vivo anti-OC effects are unclear due to the low bioavailability of systemically administered Res. Intraperitoneal administration may overcome this therapeutic dilemma because it makes Res directly affect the abdominal tumors. Ethanol and DMSO are common Res solvents, while their reliability and safety for long-term in vivo treatment remain unknown. Methods A rat orthotopic OC model was established using the rat NUTU-19 OC cell line. Res dissolved in 10% ethanol or 0.2% DMSO was injected intraperitoneally (20 mg/kg/day) into tumor-free and tumor-bearing rats for 2 weeks. The tumors were collected for gross, morphological and molecular examinations, and blood and ascitic samples were obtained for a CA125 ELISA. Res concentration in ovarian tissues was determined by high performance liquid chromatography (HPLC). Results The average tumor weight (0.187±0.065 g) of the Res-in-DMSO group was lower than that of untreated (0.426±0.091 g; P<0.01) and Res-in-ethanol (0.238±0.073 g; P<0.05) group. The average bloody ascitic volumes collected from untreated, Res-in-ethanol, and Res-in-DMSO groups were 5.65±0.27, 2.75±0.14, and 2.09±0.11 ml, respectively. Abundant TUNEL-positive cells, ARHI and PIAS3 upregulation, CA125 reduction, and decreased STAT3 nuclear translocation were found in the Res-in-ethanol and, especially, the Res-in-DMSO group. Widespread plaques of Res deposits were found on the abdominal serosa of the Res-in-ethanol group, but not in the Res-in-DMSO group. HPLC revealed a higher Res concentration in Res-in-DMSO-treated tumor tissues than in those treated by Res-in-ethanol (P<0.01). Fertility was maintained after long-term Res treatment. Conclusion Intraperitoneal administration of Res effectively inhibited rat orthotopic ovarian cancer growth without affecting normal tissues. The Res-in-DMSO group had the highest drug bioavailability and therefore stronger tumor-suppressive effects on ovarian cancer tissues.
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Affiliation(s)
- Li-Xia Zhong
- Department of Oncology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510407, Guangdong, People's Republic of China
| | - Mo-Li Wu
- Liaoning Laboratory of Cancer Genetics and Epigenetics, Department of Cell Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian 116044, People's Republic of China
| | - Hong Li
- Liaoning Laboratory of Cancer Genetics and Epigenetics, Department of Cell Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian 116044, People's Republic of China
| | - Jia Liu
- Liaoning Laboratory of Cancer Genetics and Epigenetics, Department of Cell Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian 116044, People's Republic of China
| | - Li-Zhu Lin
- Department of Oncology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510407, Guangdong, People's Republic of China
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Abstract
In this review, Goding and Arnheiter present the current understanding of MITF's role and regulation in development and disease and highlight key areas where our knowledge of MITF regulation and function is limited. All transcription factors are equal, but some are more equal than others. In the 25 yr since the gene encoding the microphthalmia-associated transcription factor (MITF) was first isolated, MITF has emerged as a key coordinator of many aspects of melanocyte and melanoma biology. Like all transcription factors, MITF binds to specific DNA sequences and up-regulates or down-regulates its target genes. What marks MITF as being remarkable among its peers is the sheer range of biological processes that it appears to coordinate. These include cell survival, differentiation, proliferation, invasion, senescence, metabolism, and DNA damage repair. In this article we present our current understanding of MITF's role and regulation in development and disease, as well as those of the MITF-related factors TFEB and TFE3, and highlight key areas where our knowledge of MITF regulation and function is limited.
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Affiliation(s)
- Colin R Goding
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Headington, Oxford OX3 7DQ, United Kingdom
| | - Heinz Arnheiter
- National Institute of Neurological Disorders and Stroke, National Institutes of Heath, Bethesda, Maryland 20824, USA
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Nguyen NT, Fisher DE. MITF and UV responses in skin: From pigmentation to addiction. Pigment Cell Melanoma Res 2018; 32:224-236. [PMID: 30019545 DOI: 10.1111/pcmr.12726] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 06/21/2018] [Accepted: 06/25/2018] [Indexed: 12/15/2022]
Abstract
Ultraviolet radiation (UVR) has numerous effects on skin, including DNA damage, tanning, vitamin D synthesis, carcinogenesis, and immunomodulation. Keratinocytes containing damaged DNA secrete both α-melanocyte-stimulating hormone (α-MSH), which stimulates pigment production by melanocytes, and the opioid β-endorphin, which can trigger addiction-like responses to UVR. The pigmentation (tanning) response is an adaptation that provides some delayed protection against further DNA damage and carcinogenesis, while the opioid response may be an evolutionary adaptation for promoting sun-seeking behavior to prevent vitamin D deficiency. Here, we review the pigmentation response to UVR, driven by melanocytic microphthalmia-associated transcription factor (MITF), and evidence for UVR-induced melanomagenesis and addiction. We also discuss potential applications of a novel approach to generate protective pigmentation in the absence of UVR (sunless tanning) using a topical small-molecule inhibitor of the salt-inducible kinase (SIK) family.
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Affiliation(s)
- Nhu T Nguyen
- Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital, and Harvard Medical School, Boston, Massachusetts
| | - David E Fisher
- Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital, and Harvard Medical School, Boston, Massachusetts
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Jiao J, Zhang R, Li Z, Yin Y, Fang X, Ding X, Cai Y, Yang S, Mu H, Zong D, Chen Y, Zhang Y, Zou J, Shao J, Huang Z. Nuclear Smad6 promotes gliomagenesis by negatively regulating PIAS3-mediated STAT3 inhibition. Nat Commun 2018; 9:2504. [PMID: 29950561 PMCID: PMC6021382 DOI: 10.1038/s41467-018-04936-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 06/06/2018] [Indexed: 12/11/2022] Open
Abstract
To date, the molecular mechanism underlying constitutive signal transducer and activator of transcription 3 (STAT3) activation in gliomas is largely unclear. In this study, we report that Smad6 is overexpressed in nuclei of glioma cells, which correlates with poor patient survival and regulates STAT3 activity via negatively regulating the Protein Inhibitors of Activated STAT3 (PIAS3). Mechanically, Smad6 interacts directly with PIAS3, and this interaction is mediated through the Mad homology 2 (MH2) domain of Smad6 and the Ring domain of PIAS3. Smad6 recruits Smurf1 to facilitate PIAS3 ubiquitination and degradation, which also depends on the MH2 domain and the PY motif of Smad6. Consequently, Smad6 reduces PIAS3-mediated STAT3 inhibition and promotes glioma cell growth and stem-like cell initiation. Moreover, the Smad6 MH2 transducible protein restores PIAS3 expression and subsequently reduces gliomagenesis. Collectively, we conclude that nuclear-Smad6 enhances glioma development by inducing PIAS3 degradation and subsequent STAT3 activity upregulation. In glioma STAT3 signaling contributes to gliomagenesis. Here, the authors show that Smad6 expression correlates with poor survival and is overexpressed in glioma cells, and regulates STAT3 activity via negatively regulating PIAS3.
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Affiliation(s)
- Jiantong Jiao
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Department of Neurosurgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Rui Zhang
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Department of Neurosurgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Zheng Li
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Department of Neurosurgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Ying Yin
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Xiangming Fang
- Department of Radiology, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Xiaopeng Ding
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Department of Neurosurgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Ying Cai
- Department of Pathology, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Shudong Yang
- Department of Pathology, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Huijun Mu
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Da Zong
- Department of Neurosurgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Yuexin Chen
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China
| | - Yansong Zhang
- Department of Neurosurgery, Nanjing Brain Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China
| | - Jian Zou
- Center of Clinical Research, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China. .,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.
| | - Junfei Shao
- Department of Neurosurgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China. .,Wuxi Institute of Translational Medicine, Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, 214023, China.
| | - Zhaohui Huang
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, 214062, China.
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13
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Phytol suppresses melanogenesis through proteasomal degradation of MITF via the ROS-ERK signaling pathway. Chem Biol Interact 2018; 286:132-140. [DOI: 10.1016/j.cbi.2018.02.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 02/14/2018] [Accepted: 02/23/2018] [Indexed: 11/19/2022]
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14
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Signaling Pathways in Melanogenesis. Int J Mol Sci 2016; 17:ijms17071144. [PMID: 27428965 PMCID: PMC4964517 DOI: 10.3390/ijms17071144] [Citation(s) in RCA: 521] [Impact Index Per Article: 65.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/03/2016] [Accepted: 07/08/2016] [Indexed: 12/25/2022] Open
Abstract
Melanocytes are melanin-producing cells found in skin, hair follicles, eyes, inner ear, bones, heart and brain of humans. They arise from pluripotent neural crest cells and differentiate in response to a complex network of interacting regulatory pathways. Melanins are pigment molecules that are endogenously synthesized by melanocytes. The light absorption of melanin in skin and hair leads to photoreceptor shielding, thermoregulation, photoprotection, camouflage and display coloring. Melanins are also powerful cation chelators and may act as free radical sinks. Melanin formation is a product of complex biochemical events that starts from amino acid tyrosine and its metabolite, dopa. The types and amounts of melanin produced by melanocytes are determined genetically and are influenced by a variety of extrinsic and intrinsic factors such as hormonal changes, inflammation, age and exposure to UV light. These stimuli affect the different pathways in melanogenesis. In this review we will discuss the regulatory mechanisms involved in melanogenesis and explain how intrinsic and extrinsic factors regulate melanin production. We will also explain the regulatory roles of different proteins involved in melanogenesis.
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15
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Yoo JY, Jeong JW, Fazleabas AT, Tayade C, Young SL, Lessey BA. Protein Inhibitor of Activated STAT3 (PIAS3) Is Down-Regulated in Eutopic Endometrium of Women with Endometriosis. Biol Reprod 2016; 95:11. [PMID: 27226311 PMCID: PMC5029430 DOI: 10.1095/biolreprod.115.137158] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 05/09/2016] [Indexed: 01/07/2023] Open
Abstract
Endometriosis is a major cause of chronic pelvic pain and infertility. Activation of STAT3 appears central to the inflammatory phenotype of eutopic endometrium in women with endometriosis. However, the molecular mechanism by which this occurs remains unknown. Our objective is to determine how STAT3 activity is regulated in endometriosis. Protein inhibitor of activated STAT3 (PIAS3) is a negative regulator of STAT3 activity. We examined the levels of PIAS3 in endometrium from women with and without endometriosis using Western blot analysis and immunohistochemistry. Levels of PIAS3 are significantly lower, in contrast with phosphorylation of STAT3, in women with endometriosis compared to women without endometriosis. Furthermore, induction of endometriosis in the baboon showed a significant reduction of PIAS3 expression during the progression of the disease. Interferon-γ (INFγ) reduces PIAS3 protein levels and increases phospho-STAT3 levels through CXCL10 in endometrial cells, Ishikawa, and 12Z cells. These results suggest that attenuation of PIAS3 causes aberrant activation of STAT3 in endometriosis, leading to inflammatory changes that may impair fertility or cause pain.
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Affiliation(s)
- Jung-Yoon Yoo
- Department of Obstetrics, Gynecology & Reproductive Biology, Michigan State University, Grand Rapids, Michigan
| | - Jae-Wook Jeong
- Department of Obstetrics, Gynecology & Reproductive Biology, Michigan State University, Grand Rapids, Michigan
| | - Asgerally T Fazleabas
- Department of Obstetrics, Gynecology & Reproductive Biology, Michigan State University, Grand Rapids, Michigan
| | - Chandrakant Tayade
- Department of Obstetrics and Gynecology, Queens University, Kingston, Canada
| | - Steven L Young
- Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, North Carolina
| | - Bruce A Lessey
- Department of Obstetrics and Gynecology, University of South Carolina School of Medicine, Greenville Health System, Greenville, South Carolina
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16
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Ortiz MA, Diaz-Torné C, Hernández MV, Reina D, de la Fuente D, Castellví I, Moya P, Ruiz JM, Corominas H, Zamora C, Cantó E, Sanmartí R, Juarez C, Vidal S. IL-6 blockade reverses the abnormal STAT activation of peripheral blood leukocytes from rheumatoid arthritis patients. Clin Immunol 2015; 158:174-82. [PMID: 25847223 DOI: 10.1016/j.clim.2015.03.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 03/27/2015] [Accepted: 03/28/2015] [Indexed: 12/22/2022]
Abstract
Considering the interplay of multiple STATs in response to cytokines, we investigated how IL-6 and its blocking affect STAT signaling in rheumatoid arthritis (RA). Leukocytes obtained from RA patients before and after tocilizumab treatment and healthy donors (HDs) were cytokine-stimulated and STAT phosphorylation was analyzed by cytometry. RA patients had significantly fewer pSTAT1+, pSTAT3+, and pSTAT6+ monocytes and pSTAT5+ lymphocytes than HDs. After 24weeks of treatment, percentages of IFNγ-induced pSTAT1+ and IL-10-induced pSTAT3+ monocytes in RA patients increased, reaching levels comparable to HDs. pSTAT1+ and pSTAT3+ cells correlated inversely with RA disease activity index and levels of pSTAT+ cells at baseline were higher in patients with good EULAR response to tocilizumab. IFNγ-induced pSTAT1+ cells correlated inversely with memory T cells and anti-CCP levels. IL-10-induced pSTAT3+ cells correlated with Treg/Teff ratio. Our findings suggest that IL-6 blocking reduces the inflammatory mechanisms through the correction of STAT1 and STAT3 activation status.
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Affiliation(s)
- M A Ortiz
- IIB-Institut Recerca Hospital de la Santa Creu I Sant Pau, Barcelona, Spain
| | - C Diaz-Torné
- Unit of Rheumatology, Department of Internal Medicine, Hospital de la Santa Creu I Sant Pau, Barcelona, Spain
| | - M V Hernández
- Arthritis Unit, Rheumatology Department, Hospital Clinic, Barcelona, Spain
| | - D Reina
- Department of Rheumatology, Hospital Moises Broggi, Sant Joan Despí, Spain
| | - D de la Fuente
- Department of Rheumatology, Hospital de Viladecans, Viladecans, Spain
| | - I Castellví
- Department of Rheumatology, Hospital Comarcal de l'Alt Penedes, Vilafranca del Penedes, Spain
| | - P Moya
- Unit of Rheumatology, Department of Internal Medicine, Hospital de la Santa Creu I Sant Pau, Barcelona, Spain
| | - J M Ruiz
- Department of Rheumatology, Hospital de Viladecans, Viladecans, Spain
| | - H Corominas
- Department of Rheumatology, Hospital Moises Broggi, Sant Joan Despí, Spain
| | - C Zamora
- IIB-Institut Recerca Hospital de la Santa Creu I Sant Pau, Barcelona, Spain
| | - E Cantó
- IIB-Institut Recerca Hospital de la Santa Creu I Sant Pau, Barcelona, Spain
| | - R Sanmartí
- Arthritis Unit, Rheumatology Department, Hospital Clinic, Barcelona, Spain
| | - C Juarez
- Department of Immunology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - S Vidal
- IIB-Institut Recerca Hospital de la Santa Creu I Sant Pau, Barcelona, Spain.
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17
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Howlin J, Cirenajwis H, Lettiero B, Staaf J, Lauss M, Saal L, Borg Å, Gruvberger-Saal S, Jönsson G. Loss of CITED1, an MITF regulator, drives a phenotype switch in vitro and can predict clinical outcome in primary melanoma tumours. PeerJ 2015; 3:e788. [PMID: 25755924 PMCID: PMC4349148 DOI: 10.7717/peerj.788] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 02/04/2015] [Indexed: 12/15/2022] Open
Abstract
CITED1 is a non-DNA binding transcriptional co-regulator whose expression can distinguish the ‘proliferative’ from ‘invasive’ signature in the phenotype-switching model of melanoma. We have found that, in addition to other ‘proliferative’ signature genes, CITED1 expression is repressed by TGFβ while the ‘invasive’ signature genes are upregulated. In agreement, CITED1 positively correlates with MITF expression and can discriminate the MITF-high/pigmentation tumour molecular subtype in a large cohort (120) of melanoma cell lines. Interestingly, CITED1 overexpression significantly suppressed MITF promoter activation, mRNA and protein expression levels while MITF was transiently upregulated following siRNA mediated CITED1 silencing. Conversely, MITF siRNA silencing resulted in CITED1 downregulation indicating a reciprocal relationship. Whole genome expression analysis identified a phenotype shift induced by CITED1 silencing and driven mainly by expression of MITF and a cohort of MITF target genes that were significantly altered. Concomitantly, we found changes in the cell-cycle profile that manifest as transient G1 accumulation, increased expression of CDKN1A and a reduction in cell viability. Additionally, we could predict survival outcome by classifying primary melanoma tumours using our in vitro derived ‘CITED1-silenced’ gene expression signature. We hypothesize that CITED1 acts a regulator of MITF, functioning to maintain MITF levels in a range compatible with tumourigenesis.
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Affiliation(s)
- Jillian Howlin
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden.,Cell and Experimental Pathology, Department of Laboratory Medicine Malmö, Lund University, Sweden
| | - Helena Cirenajwis
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Barbara Lettiero
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Johan Staaf
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Martin Lauss
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Lao Saal
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Åke Borg
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Sofia Gruvberger-Saal
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
| | - Göran Jönsson
- Division of Oncology-Pathology, Lund University Cancer Center/Medicon Village, Scheelevägen, Lund, Sweden
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18
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Huang H, Li Y, Qi X. Cytokine signaling in the differentiation of innate effector cells. JAKSTAT 2014; 2:e23531. [PMID: 24058796 PMCID: PMC3670272 DOI: 10.4161/jkst.23531] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 01/04/2013] [Accepted: 01/07/2013] [Indexed: 12/24/2022] Open
Abstract
Innate effector cells, including innate effector cells of myeloid and lymphoid lineages, are crucial components of various types of immune responses. Bone marrow progenitors differentiate into many subsets of innate effector cells after receiving instructional signals often provided by cytokines. Signal transducer and activator of transcription (STATs) have been shown to be essential in the differentiation of various types of innate effector cells. In this review, we focus specifically on the differentiation of innate effector cells, particularly the role of cytokine signaling in the differentiation of innate effector cells.
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Affiliation(s)
- Hua Huang
- Division of Allergy and Immunology; Department of Medicine; National Jewish Health; Denver, CO USA ; Integrated Department of Immunology; University of Colorado School of Medicine; Denver, CO USA
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19
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Kwon KJ, Bae S, Kim K, An IS, Ahn KJ, An S, Cha HJ. Asiaticoside, a component of Centella asiatica, inhibits melanogenesis in B16F10 mouse melanoma. Mol Med Rep 2014; 10:503-7. [PMID: 24756377 DOI: 10.3892/mmr.2014.2159] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 03/07/2014] [Indexed: 11/05/2022] Open
Abstract
Melanogenesis is the process of generating pigmentation via melanin synthesis and delivery. Three key enzymes, tyrosinase, tyrosinase-related protein 1 (TRP1) and TRP2, metabolize melanin from L-tyrosine. Melanin synthesizing enzymes are regulated by microphthalmia-associated transcription factor (MITF). The titrated extract of Centella asiatica (TECA) contains the major components asiatic acid, asiaticoside and madecassic acid. The present study revealed that TECA reduces the melanin content in melanocytes. Moreover, the asiaticoside contained in TECA modulated melanogenesis by inhibiting tyrosinase mRNA expression. The decrease in tyrosinase mRNA levels was mediated through MITF. Uniquely, asiaticoside inhibited MITF by decreasing its DNA binding affinity. In conclusion, the results of the present study indicate that asiaticoside treatment may have beneficial effects in hyperpigmentation diseases or for skin whitening.
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Affiliation(s)
- Ku Jung Kwon
- Korea Institute for Skin and Clinical Sciences and Molecular‑Targeted Drug Research Center, Konkuk University, Seoul 143‑701, Republic of Korea
| | - Seunghee Bae
- Korea Institute for Skin and Clinical Sciences and Molecular‑Targeted Drug Research Center, Konkuk University, Seoul 143‑701, Republic of Korea
| | - Karam Kim
- Korea Institute for Skin and Clinical Sciences and Molecular‑Targeted Drug Research Center, Konkuk University, Seoul 143‑701, Republic of Korea
| | - In Sook An
- Korea Institute for Skin and Clinical Sciences and Molecular‑Targeted Drug Research Center, Konkuk University, Seoul 143‑701, Republic of Korea
| | - Kyu Joong Ahn
- Department of Dermatology, Konkuk University School of Medicine, Seoul 143‑701, Republic of Korea
| | - Sungkwan An
- Korea Institute for Skin and Clinical Sciences and Molecular‑Targeted Drug Research Center, Konkuk University, Seoul 143‑701, Republic of Korea
| | - Hwa Jun Cha
- Korea Institute for Skin and Clinical Sciences and Molecular‑Targeted Drug Research Center, Konkuk University, Seoul 143‑701, Republic of Korea
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20
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Lee SH, Moon SJ, Park MJ, Kim EK, Moon YM, Cho ML. PIAS3 suppresses acute graft-versus-host disease by modulating effector T and B cell subsets through inhibition of STAT3 activation. Immunol Lett 2014; 160:79-88. [PMID: 24718277 DOI: 10.1016/j.imlet.2014.03.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 03/28/2014] [Accepted: 03/28/2014] [Indexed: 01/08/2023]
Abstract
Graft-versus-host disease (GVHD) caused by transplanted donor T cells remains the major obstacle of allogeneic bone marrow transplantation (BMT). Previous reports have suggested that IL-17-producing helper T (Th17) cells mediate the development of acute GVHD (aGVHD). Protein inhibitor of activated STAT3 (PIAS) inhibits the activity of the transcription factor STAT3, which is a pivotal transcription factor for Th17 differentiation. To elucidate whether PIAS3 could inhibit the development of aGVHD, pcDNA-PIAS3 or mock vector was administered in a murine model of aGVHD by intramuscular injection and subsequent electroporation. The results demonstrated that PIAS3 overexpression by pcDNA-vector administration significantly attenuated the clinical severity and histopathological severities of aGHVD involving the skin, liver, intestine, and lung. Additionally, the STAT3 activities in aGVHD target organs were suppressed by PIAS3 overexpression. Furthermore, phosphorylated (p) STAT3 activity in the spleen was profoundly attenuated in PIAS3-overexpressing GVHD mice. Interestingly, flow cytometric analysis demonstrated that the populations of CD21(high)CD23(low) marginal zone B cells were dramatically expanded in PIAS3-overexpressing mice. PIAS3-induced inhibition of aGVHD was largely related to the downregulation of Th1 and Th17 and the upregulation of Th2 and Treg populations. Both populations of pSTAT3(Tyr705)-expressing Th17 cells and B cells were significantly reduced in the spleens of PIAS3-overexpressing mice, whereas pSTAT5 activity was increased. In addition to CD4(+)CD25(+)Foxp3(+) Treg cells, the populations of CD8(+)CD25(+)Foxp3(+) Treg cells were also expanded by treatment with PIAS3. These data suggest the therapeutic potential of PIAS3 in the development of aGVHD through reciprocal regulation of Th17/Treg lineages.
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Affiliation(s)
- Sung-Hee Lee
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea, Seoul, South Korea; Laboratory of Immune Network, Conversant Research Consortium in Immunologic Disease, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Su-Jin Moon
- Division of Rheumatology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Min-Jung Park
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea, Seoul, South Korea; Laboratory of Immune Network, Conversant Research Consortium in Immunologic Disease, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Eun-Kyung Kim
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea, Seoul, South Korea; Laboratory of Immune Network, Conversant Research Consortium in Immunologic Disease, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Young-Mee Moon
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea, Seoul, South Korea; Laboratory of Immune Network, Conversant Research Consortium in Immunologic Disease, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Mi-La Cho
- The Rheumatism Research Center, Catholic Research Institute of Medical Science, The Catholic University of Korea, Seoul, South Korea; Laboratory of Immune Network, Conversant Research Consortium in Immunologic Disease, College of Medicine, The Catholic University of Korea, Seoul, South Korea.
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21
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Sun Y, Zuo X, Zheng X, Zhou F, Liang B, Liu H, Chang R, Gao J, Sheng Y, Cui H, Wang W, Andiappan AK, Rotzschke O, Yang S, Sun L, Zhang F, Zhang X, Ren Y, Liu J. A comprehensive association analysis confirms ZMIZ1 to be a susceptibility gene for vitiligo in Chinese population. J Med Genet 2014; 51:345-53. [PMID: 24667117 DOI: 10.1136/jmedgenet-2013-102233] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND ZMIZ1 has been shown to be associated with multiple autoimmune diseases and play a role in the development of melanocyte. The association of ZMIZ1 with vitiligo was also suggested, but the evidence did not reach genome-wide significance and has not been confirmed by independent studies. METHODS A fine mapping analysis of the ZMIZ1 locus was carried out in the dataset of 1117 vitiligo patients and 3437 controls through deep imputation. Ten suggestive SNPs were then analysed in an independent validation cohort of 7458 cases and 7542 controls. SNPs within ZMIZ1 locus were functionally annotated using the ENCODE and RegulomeDB databases and published eQTL dataset of primary immune cells. RESULTS A genome-wide significant association was discovered at rs1408944 (OR(combined)=1.18, p(combined)=1.38E-09) that locates at a DNAse hypersensitivity site and within a Myb_1 motif carried by the binding sites of six overlapping transcription factors (TFs) within the region. Gene Relationships Across Implicated Loci (GRAIL) analysis revealed biological connectivity between ZMIZ1 and previously discovered susceptibility loci for vitiligo as well as the six TFs. CONCLUSIONS Our study has confirmed ZMIZ1 as a novel susceptibility locus for vitiligo and further suggested rs1408944 to be the putative causal variant that potentially interrupts TF binding and thus the transcriptional regulation of ZMIZ1.
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Affiliation(s)
- Yonghu Sun
- Institute of Dermatology and Department of Dermatology at No. 1 Hospital, Anhui Medical University, Hefei, Anhui, China
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22
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Mitochondrial STAT3 plays a major role in IgE-antigen-mediated mast cell exocytosis. J Allergy Clin Immunol 2014; 134:460-9. [PMID: 24582310 DOI: 10.1016/j.jaci.2013.12.1075] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 12/03/2013] [Accepted: 12/31/2013] [Indexed: 01/15/2023]
Abstract
BACKGROUND The involvement of mitochondrial oxidative phosphorylation (OXPHOS) in mast cell exocytosis was recently suggested by the finding that mitochondria translocate to exocytosis sites upon mast cell activation. In parallel, mitochondrial signal transducer and activator of transcription 3 (STAT3) was found to be involved in ATP production. However, the regulation of mitochondrial STAT3 function and its connection to mast cell exocytosis is unknown. OBJECTIVE We sought to explore the role played by mitochondrial STAT3 in mast cell exocytosis. METHODS Experiments were performed in vitro with human and mouse mast cells and rat basophilic leukemia (RBL) cells and in vivo in mice. OXPHOS activity was measured after immunologic activation. The expression of STAT3, extracellular signal-regulated kinase 1/2, and protein inhibitor of activated STAT3 in the mitochondria during mast cell activation was determined, as was the effect of STAT3 inhibition on OXPHOS activity and mast cell function. RESULTS Here we show that mitochondrial STAT3 is essential for immunologically mediated degranulation of human and mouse mast cells and RBL cells. Additionally, in IgE-antigen-activated RBL cells, mitochondrial STAT3 was phosphorylated on serine 727 in an extracellular signal-regulated kinase 1/2-dependent manner, which was followed by induction of OXPHOS activity. Furthermore, the endogenous inhibitor of STAT3, protein inhibitor of activated STAT3, was found to inhibit OXPHOS activity in the mitochondria, resulting in inhibition of mast cell degranulation. Moreover, mice injected with Stattic, a STAT3 inhibitor, had a significant decrease in histamine secretion. CONCLUSION These results provide the first evidence of a regulatory role for mitochondrial STAT3 in mast cell functions, and therefore mitochondrial STAT3 could serve as a new target for the manipulation of allergic diseases.
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Monoallelic loss of tumor suppressor GRIM-19 promotes tumorigenesis in mice. Proc Natl Acad Sci U S A 2013; 110:E4213-22. [PMID: 24145455 DOI: 10.1073/pnas.1303760110] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Gene-associated with retinoid-interferon induced mortality-19 (GRIM-19), a STAT3-inhibitory protein, was isolated as a growth-suppressive gene product using a genome-wide expression knockdown screen. We and others have shown a loss of expression and occurrence of mutations in the GRIM-19 gene in a variety of primary human cancers, indicating its potential role as tumor suppressor. To help investigate its role in tumor development in vivo, we generated a genetically modified mouse in which Grim-19 can be conditionally inactivated. Deletion of Grim-19 in the skin significantly increased the susceptibility of mice to chemical carcinogenesis, resulting in development of squamous cell carcinomas. These tumors had high Stat3 activity and an increased expression of Stat3-responsive genes. Loss of Grim-19 also caused mitochondrial electron transport dysfunction resulting from failure to assemble electron transport chain complexes and altered the expression of several cellular genes involved in glycolysis. Surprisingly, the deletion of a single copy of the Grim-19 gene was sufficient to promote carcinogenesis and formation of invasive squamous cell carcinomas. These observations highlight the critical role of GRIM-19 as a tumor suppressor.
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Abramova A, Sakaguchi S, Schebesta A, Hassan H, Boucheron N, Valent P, Roers A, Ellmeier W. The transcription factor MAZR preferentially acts as a transcriptional repressor in mast cells and plays a minor role in the regulation of effector functions in response to FcεRI stimulation. PLoS One 2013; 8:e77677. [PMID: 24204913 PMCID: PMC3804165 DOI: 10.1371/journal.pone.0077677] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 09/03/2013] [Indexed: 11/19/2022] Open
Abstract
Mast cells are key players in type I hypersensitivity reactions in humans and mice and their activity has to be tightly controlled. Previous studies implicated the transcription factor MAZR in the regulation of mast cell function. To study the role of MAZR in mast cells, we generated a conditional Mazr allele and crossed Mazr (F/F) mice with the Vav-iCre deleter strain, which is active in all hematopoietic cells. MAZR-null BM-derived mast cells (BMMC) were phenotypically indistinguishable from wild-type BMMCs, although the numbers of IL-3 generated Mazr (F/F) Vav-iCre BMMCs were reduced in comparison to Mazr (F/F) BMMCs, showing that MAZR is required for the efficient generation of BMMC in vitro. A gene expression analysis revealed that MAZR-deficiency resulted in the dysregulation of 128 genes, with more genes up- than down-regulated in the absence of MAZR, indicating that MAZR acts as a transcriptional repressor in mast cells. Among the up-regulated genes were the chemokines Ccl5, Cxcl10, Cxcl12, the chemokine receptor Ccr5 and the cytokine IL18, suggesting an immunoregulatory role for MAZR in mast cells. Enforced expression of MAZR in mature Mazr-deficient BMMCs rescued the altered expression pattern of some genes tested, suggesting direct regulation of these genes by MAZR. Upon FcεRI stimulation, Mazr expression was transiently down-regulated in BMMCs. However, early and late effector functions in response to FcεRI-mediated stimulation were not impaired in the absence of MAZR, with the exception of IL-6, which was slightly decreased. Taken together, out data indicate that MAZR preferentially acts as a transcriptional repressor in mast cells, however MAZR plays only a minor role in the transcriptional networks that regulate early and late effector functions in mast cells in response to FcεRI stimulation.
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Affiliation(s)
- Anastasia Abramova
- Division of Immunobiology, Institute of Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Shinya Sakaguchi
- Division of Immunobiology, Institute of Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Alexandra Schebesta
- Division of Immunobiology, Institute of Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Hammad Hassan
- Division of Immunobiology, Institute of Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Nicole Boucheron
- Division of Immunobiology, Institute of Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Peter Valent
- Division of Hematology and Hemostaseology, Department of Internal Medicine I, Medical University of Vienna, Vienna, Austria
| | - Axel Roers
- Institute for Immunology, University of Technology Dresden, Medical Faculty Carl-Gustav Carus, Dresden, Germany
| | - Wilfried Ellmeier
- Division of Immunobiology, Institute of Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
- * E-mail:
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Li H, Gao H, Bijukchhe SM, Wang Y, Li T. PIAS3 may represent a potential biomarker for diagnosis and therapeutic of human colorectal cancer. Med Hypotheses 2013; 81:1151-4. [PMID: 24120699 DOI: 10.1016/j.mehy.2013.09.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 08/30/2013] [Accepted: 09/15/2013] [Indexed: 01/22/2023]
Abstract
Colorectal cancer (CRC) is a challenging problem both for the developed and underdeveloped countries. Despite numerous improvements in early diagnosis and treatment, the incidence and mortality is still keeping in a high level. Molecule targeted therapy has drawn much attention as next generation anticancer agents for diagnosis and therapeutic of CRC. Protein Inhibitor of Activated Signal Transducer and Activators of Transcription 3 (PIAS3) as a novel biomarker has been focused to have a role in the development of malignancy, which was expressed at a higher level in most common malignancies compared with corresponding normal tissues. Furthermore, evidences suggest that the expression of PIAS3 can affect the growth of cancer cells by inhibiting the JAK/STAT and PI3-K/Akt signaling pathways or regulating its SUMO (small-ubiquitin like modifiers) ligase activity in some malignancy. Therefore, we hypothesized that PIAS3 may be a potential biomarker target for early cancer detection and therapeutic of human CRC.
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Affiliation(s)
- Heping Li
- Department of Gastrointestinal Surgery, The First Affiliated Hospital to Xinjiang Medical University, Urumqi 830054, China
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Xiong Q, Zhong Q, Zhang J, Yang M, Li C, Zheng P, Bi LJ, Ge F. Identification of novel miR-21 target proteins in multiple myeloma cells by quantitative proteomics. J Proteome Res 2012; 11:2078-90. [PMID: 22316494 DOI: 10.1021/pr201079y] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Substantial evidence indicates that microRNA-21 (miR-21) is a key oncomiR in carcinogenesis and is significantly elevated in multiple myeloma (MM). In this study, we explored the role of miR-21 in human MM cells and searched for miR-21 targets. By knocking down the expression of endogenous miR-21 in U266 myeloma cells, we observed reduced growth, an arrested cell cycle, and increased apoptosis. To further understand its molecular mechanism in the pathogenesis of MM, we employed a SILAC (stable isotope labeling by amino acids in cell culture)-based quantitative proteomic strategy to systematically identify potential targets of miR-21. In total, we found that the expression of 178 proteins was up-regulated significantly by miR-21 inhibition, implying that they could be potential targets of miR-21. Among these, the protein inhibitor of activated STAT3 (PIAS3) was confirmed as a direct miR-21 target by Western blotting and reporter gene assays. We further demonstrated that miR-21 enhances the STAT3-dependent signal pathway by inhibiting the function of PIAS3 and that down-regulation of PIAS3 contributes to the oncogenic function of miR-21. This elucidation of the role of PIAS3 in the miR-21-STAT3 positive regulatory loop not only may shed light on the molecular basis of the biological effects of miR-21 observed in MM cells but also has direct implications for the development of novel anti-MM therapeutic strategies.
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Affiliation(s)
- Qian Xiong
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
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Transcription factor E3, a major regulator of mast cell-mediated allergic response. J Allergy Clin Immunol 2012; 129:1357-1366.e5. [PMID: 22360977 DOI: 10.1016/j.jaci.2011.11.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Revised: 11/23/2011] [Accepted: 11/29/2011] [Indexed: 11/20/2022]
Abstract
BACKGROUND Microphthalmia transcription factor, an MiT transcription family member closely related to transcription factor E3 (TFE3), is essential for mast cell development and survival. TFE3 was previously reported to play a role in the functions of B and T cells; however, its role in mast cells has not yet been explored. OBJECTIVE We sought to explore the role played by TFE3 in mast cell function. METHODS Mast cell numbers were evaluated by using toluidine blue staining. FACS analysis was used to determine percentages of Kit and FcεRI double-positive cells in the peritoneum of wild-type (WT) and TFE3 knockout (TFE3(-/-)) mice. Cytokine and inflammatory mediator secretion were measured in immunologically activated cultured mast cells derived from either knockout or WT mice. In vivo plasma histamine levels were measured after immunologic triggering of these mice. RESULTS No significant differences in mast cell numbers between WT and TFE3(-/-) mice were observed in the peritoneum, lung, and skin. However, TFE3(-/-) mice showed a marked decrease in the number of Kit(+) and FcεRI(+) peritoneal and cultured mast cells. Surface expression levels of FcεRI in TFE3(-/-) peritoneal mast cells was significantly lower than in control cells. Cultured mast cells derived from TFE3(-/-) mice showed a marked decrease in degranulation and mediator secretion. In vivo experiments showed that the level of plasma histamine in TFE3(-/-) mice after an allergic trigger was substantially less than that seen in WT mice. CONCLUSION TFE3 is a novel regulator of mast cell functions and as such could emerge as a new target for the manipulation of allergic diseases.
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Xiong R, Nie L, Xiang LX, Shao JZ. Characterization of a PIAS4 Homologue from Zebrafish: Insights into Its Conserved Negative Regulatory Mechanism in the TRIF, MAVS, and IFN Signaling Pathways during Vertebrate Evolution. THE JOURNAL OF IMMUNOLOGY 2012; 188:2653-68. [DOI: 10.4049/jimmunol.1100959] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Thingnes J, Lavelle TJ, Gjuvsland AB, Omholt SW, Hovig E. Towards a quantitative understanding of the MITF-PIAS3-STAT3 connection. BMC SYSTEMS BIOLOGY 2012; 6:11. [PMID: 22316093 PMCID: PMC3341200 DOI: 10.1186/1752-0509-6-11] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2011] [Accepted: 02/08/2012] [Indexed: 01/27/2023]
Abstract
Background Expression of the two transcription factors microphthalmia-associated transcription factor (MITF) and signal transducer and activator of transcription 3 (STAT3) are tightly connected to cell proliferation and survival, and are important for melanocyte development. The co-regulation of MITF and STAT3 via their binding to a common inhibitor Protein Inhibitor of Activated STAT3 (PIAS3) is intriguing. A better quantitative understanding of this regulation is likely to be important for elucidation of the melanocyte biology. Results We present a mathematical model describing the MITF-PIAS3-STAT3 signalling network. A default parameter set was developed, partly informed by the literature and partly by constraining the model to mimic reported behavioural features of the system. In addition, a set of experiment-specific parameters was derived for each of 28 experiments reported in the literature. The model seems capable of accounting for most of these experiments in terms of observed temporal development of protein amounts and phosphorylation states. Further, the results also suggest that this system possesses some regulatory features yet to be elucidated. Conclusions We find that the experimentally observed crosstalk between MITF and STAT3 via PIAS3 in melanocytes is faithfully reproduced in our model, offering mechanistic explanations for this behaviour, as well as providing a scaffold for further studies of MITF signalling in melanoma.
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Affiliation(s)
- Josef Thingnes
- Centre for Integrative Genetics, Department of Mathematical Sciences and Technology, Norwegian University of Life Sciences, 1430 Ås, Norway.
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Liu LM, Yan MG, Yang DH, Sun WW, Zhang JX. The expression of protein inhibitor of activated signal transducers and activators of transcription 3 in the evolutionary process of gastric cancer. Eur J Intern Med 2011; 22:e31-5. [PMID: 21925039 DOI: 10.1016/j.ejim.2011.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 04/03/2011] [Accepted: 04/04/2011] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To study the expression of PIAS3 (protein inhibitor of activated signal transducers and activators of transcription 3) in the evolutionary process of gastric cancer. METHODS Samples were taken from the endoscopic biopsy specimens of 125 patients. Gastric mucosal lesions were diagnosed in HE staining, and chronic atrophic gastritis (CAG) with intestinal metaplasia (IM) were distinguished in AB-PAS and HID-AB staining. The expressions of PIAS3 gene in different types of gastric mucosal lesions were detected by immunocytochemistry and in situ hybridization. The results were analyzed using IPP 6.0 image analysis system, from which the average optical density was obtained of positive cells. RESULTS There were 25 patients with chronic superficial gastritis (CSG), 87 CAG (30 with complete intestinal IM, 27 with incomplete intestinal IM, 21 with complete colonic IM, 9 with incomplete colonic IM), 8 dysplasia (DYS) and 5 gastric cancer (GC). In the expressions of PIAS3 mRNA and protein, a difference was not found between the patients with CSG and those with CAG with complete or incomplete intestinal IM; however, a significant difference was statistically found among patients with CSG (or intestinal IM), complete colonic IM, incomplete colonic IM, DYS and GC, expression levels of which stepped down one by one. CONCLUSIONS There are differences in the PIAS3 expression from different stages of gastric precancerous conditions/lesions to GC, which may reveal a close relationship between expression reduction or loss of PIAS3 and gastric tumorigenesis.
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Affiliation(s)
- Liang-Ming Liu
- Songjiang Hospital Affiliated to the First People's Hospital Shanghai Jiaotong University, Shanghai 201600, China.
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31
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Dabir S, Kluge A, Aziz MA, Houghton JA, Dowlati A. Identification of STAT3-independent regulatory effects for protein inhibitor of activated STAT3 by binding to novel transcription factors. Cancer Biol Ther 2011; 12:139-51. [PMID: 21532337 DOI: 10.4161/cbt.12.2.15732] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Protein Inhibitor of Activated Signal Transducer and Activators of Transcription 3 (PIAS3) is a molecule that regulates STAT3 and has antiproliferative properties. Glioblastoma and squamous cell lung cancer lack PIAS3 expression. To test the hypothesis that PIAS3 transcriptional effects are STAT3-independent, we developed models for STAT3 knockdown and PIAS3 over-expression. PIAS3 expression results in a distinct transcriptional profile that does not occur with STAT3 knockdown. We identify novel transcription factor binding partners for PIAS3 including ETS, EGR1, NR1I2, and GATA1. PIAS3 binds to these factors and regulates their transcriptional effects resulting in alterations in canonical pathways including Wnt/β-catenin signaling and functions such as cell death and proliferation. A model is proposed by which PIAS3 effects EGR1 regulated pathways.
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Affiliation(s)
- Snehal Dabir
- Division of Hematology/Oncology, Department of Medicine, Case Western Reserve University, Cleveland, OH USA
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32
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Carmi-Levy I, Motzik A, Ofir-Birin Y, Yagil Z, Yang CM, Kemeny DM, Han JM, Kim S, Kay G, Nechushtan H, Suzuki R, Rivera J, Razin E. Importin beta plays an essential role in the regulation of the LysRS-Ap(4)A pathway in immunologically activated mast cells. Mol Cell Biol 2011; 31:2111-21. [PMID: 21402779 PMCID: PMC3133347 DOI: 10.1128/mcb.01159-10] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2010] [Accepted: 03/01/2011] [Indexed: 01/11/2023] Open
Abstract
We recently reported that diadenosine tetraphosphate hydrolase (Ap(4)A hydrolase) plays a critical role in gene expression via regulation of intracellular Ap(4)A levels. This enzyme serves as a component of our newly described lysyl tRNA synthetase (LysRS)-Ap(4)A biochemical pathway that is triggered upon immunological challenge. Here we explored the mechanism of this enzyme's translocation into the nucleus and found its immunologically dependent association with importin beta. Silencing of importin beta prevented Ap(4)A hydrolase nuclear translocation and affected the local concentration of Ap(4)A, which led to an increase in microphthalmia transcription factor (MITF) transcriptional activity. Furthermore, immunological activation of mast cells resulted in dephosphorylation of Ap(4)A hydrolase, which changed the hydrolytic activity of the enzyme.
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Affiliation(s)
- Irit Carmi-Levy
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research—Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Alex Motzik
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research—Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Yifat Ofir-Birin
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research—Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Zohar Yagil
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research—Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Christopher Maolin Yang
- Immunology Program and Department of Microbiology, Centre for Life Sciences, National University of Singapore, Singapore 117597, Republic of Singapore
| | - David Michael Kemeny
- Immunology Program and Department of Microbiology, Centre for Life Sciences, National University of Singapore, Singapore 117597, Republic of Singapore
| | - Jung Min Han
- Center for Medicinal Protein Network and Systems Biology and the Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Sunghoon Kim
- National Creative Research Initiatives Center for ARS Network, College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
| | - Gillian Kay
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research—Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Hovav Nechushtan
- Oncology Department, Hadassah Hebrew University Medical Center, POB 12272, Jerusalem 91120, Israel
| | - Ryo Suzuki
- Laboratory of Molecular Immunogenetics, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892-3675
| | - Juan Rivera
- Laboratory of Molecular Immunogenetics, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892-3675
| | - Ehud Razin
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research—Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
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Liu LM, Yan MG, Yang DH, Sun WW, Zhang JX. PIAS3 expression in human gastric carcinoma and its adjacent non-tumor tissues. Clin Res Hepatol Gastroenterol 2011; 35:393-8. [PMID: 21334998 DOI: 10.1016/j.clinre.2010.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Revised: 11/27/2010] [Accepted: 12/02/2010] [Indexed: 02/04/2023]
Abstract
OBJECTIVE PIAS3 is the endogenous inhibitor of STAT3, which has been implicated in the pathogenesis of many cancers. However, the effect of PIAS3 on human tumors remains elusive. The aim of this article is to investigate the expression of PIAS3 in gastric carcinoma and its adjacent non-tumor tissues. METHODS Samples were taken from 30 patients with gastric cancer, which included tumor or non-tumor tissues in the excised sections. The expression of PIAS3 protein was detected by immunocytochemistry, and that of mRNA by in situ hybridization. The results were semi-quantitative analyzed by using cell count and color depth to stage. RESULTS The expression levels of PIAS3 protein and mRNA were significantly lower in gastric cancerous tissues than in its adjacent non-tumor tissues, and had a close relation with tumor size and differentiation, but not with age, gender and lymphatic metastasis in gastric carcinoma. The more large in size and poorly in differentiation, the more low PIAS3 expression was. CONCLUSION Loss of PIAS3 expression may be an important characteristic of gastric cancer and suggest vicious degree of the tumor.
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Affiliation(s)
- Liang-ming Liu
- Songjiang Hospital Affiliated to The First People's Hospital Shanghai Jiaotong University, Shanghai 201600, China.
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Tshori S, Nechushtan H. Mast cell transcription factors--regulators of cell fate and phenotype. Biochim Biophys Acta Mol Basis Dis 2011; 1822:42-8. [PMID: 21236338 DOI: 10.1016/j.bbadis.2010.12.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 12/16/2010] [Accepted: 12/30/2010] [Indexed: 10/18/2022]
Abstract
Transcription factors have a key role in mast cell differentiation and response of differentiated mast cells to external stimuli. During differentiation of progenitor cells to mast cells, a role for different GATA transcription factors in combination with PU.1 expression and downregulation of C/EBPα has been described. Notch pathway has been proposed to have a role in mast cell development. The microphthalmia-associated transcription factor expression is upregulated in later stages of mast cells differentiation, but it is not expressed in the closely related basophiles. In differentiated mast cells, there is a role for transcription factors both in determining the specific mast cell phenotype and in the response to immune stimuli such as IgE-Ag. A large number of transcription factors, including AP-1 family proteins, microphthalmia-associated transcription factor and STAT5, are modulated by these stimuli. These transcription factors and related protein modulators form a complex transcription factor network. They can form stimuli regulated specific heterodimers and common inhibitors can move from one protein to another. Transcription factors are the key regulators of mast cell physiology. Modulation of key transcription by such means as the therapeutic siRNA may hopefully allow us to modulate mast cell function, obtaining clinical benefit in a variety of diseases. This article is part of a Special Issue entitled: Mast cells in inflammation.
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Affiliation(s)
- Sagi Tshori
- Department of Medical Biophysics and Nuclear Medicine, Hadassah-Hebrew University Medical Center, P.O. Box 12000, Jerusalem, 91120, Israel
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Okumura F, Matsunaga Y, Katayama Y, Nakayama KI, Hatakeyama S. TRIM8 modulates STAT3 activity through negative regulation of PIAS3. J Cell Sci 2010; 123:2238-45. [PMID: 20516148 DOI: 10.1242/jcs.068981] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
TRIM8 is a member of the protein family defined by the presence of a common domain structure composed of a tripartite motif: a RING-finger, one or two B-box domains and a coiled-coil motif. Here, we show that TRIM8 interacts with protein inhibitor of activated STAT3 (PIAS3), which inhibits IL-6-dependent activation of STAT3. Ectopic expression of TRIM8 cancels the negative effect of PIAS3 on STAT3, either by degradation of PIAS3 through the ubiquitin-proteasome pathway or exclusion of PIAS3 from the nucleus. Furthermore, expression of TRIM8 in NIH3T3 cells enhances Src-dependent tumorigenesis. These findings indicate that TRIM8 enhances the STAT3-dependent signal pathway by inhibiting the function of PIAS3.
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Affiliation(s)
- Fumihiko Okumura
- Department of Biochemistry, Hokkaido University Graduate School of Medicine, N15, W7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan
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Yagil Z, Nechushtan H, Kay G, Yang CM, Kemeny DM, Razin E. The enigma of the role of protein inhibitor of activated STAT3 (PIAS3) in the immune response. Trends Immunol 2010; 31:199-204. [PMID: 20181527 DOI: 10.1016/j.it.2010.01.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Revised: 01/18/2010] [Accepted: 01/19/2010] [Indexed: 01/09/2023]
Abstract
Protein inhibitor of activated STAT3 (PIAS3), the main cellular inhibitor of signal transducers and activator of transcription 3 (STAT3), has been described as a modulator of DNA binding transcription factors. The exploration of the emerging roles of PIAS3 in immune regulation is a growing and fascinating field. Recent discoveries have shed new light on the key role of PIAS3 in the regulation of transcriptional activity, and on the molecular mechanism involved. These findings suggest that the known functions of this signalling molecule are merely the "tip of the iceberg". This article reviews the challenging questions regarding the link between PIAS3 and the intracellular signalling in immune cells. Some of the known functions of PIAS3 that potentially modulate key proteins in the immune system will also be discussed.
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Affiliation(s)
- Zohar Yagil
- Department of Biochemistry, Institute for Medical Research Israel-Canada, Hebrew University Hadassah Medical School, POB 12272, Jerusalem 91120, Israel
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Abstract
Transcriptional regulation in melanoma is a complex process that tends to hijack the normal melanocyte signaling pathways involved in melanocyte development, pigmentation, and survival. At the center of these often overlapping networks of transcriptional activation and repression is microphthalmia-associated transcription factor (MITF), a melanocyte lineage marker that increases pigment production and exhibits diverse effects on cell survival, proliferation, and cell cycle arrest. The particular conditions that allow MITF to produce these potentially contradictory roles have not yet been fully elucidated, but analysis of the pathways involved provides opportunities to learn about new therapeutic strategies.
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Yannay-Cohen N, Carmi-Levy I, Kay G, Yang CM, Han JM, Kemeny DM, Kim S, Nechushtan H, Razin E. LysRS serves as a key signaling molecule in the immune response by regulating gene expression. Mol Cell 2009; 34:603-11. [PMID: 19524539 DOI: 10.1016/j.molcel.2009.05.019] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Revised: 12/31/2008] [Accepted: 05/26/2009] [Indexed: 11/28/2022]
Abstract
Lysyl-tRNA synthetase (LysRS) was found to produce diadenosine tetraphosphate (Ap(4)A) in vitro more than two decades ago. Here, we used LysRS silencing in mast cells in combination with transfected normal and mutated LysRS to demonstrate in vivo the critical role played by LysRS in the production of Ap(4)A in response to immunological challenge. Upon such challenge, LysRS was phosphorylated on serine 207 in a MAPK-dependent manner, released from the multisynthetase complex, and translocated into the nucleus. We previously demonstrated that LysRS forms a complex with MITF and its repressor Hint-1, which is released from the complex by its binding to Ap(4)A, enabling MITF to transcribe its target genes. Here, silencing LysRS led to reduced Ap(4)A production in immunologically activated cells, which resulted in a lower level of MITF inducible genes. Our data demonstrate that specific LysRS serine 207 phosphorylation regulates Ap(4)A production in immunologically stimulated mast cells, thus implying that LysRS is a key mediator in gene regulation.
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Affiliation(s)
- Nurit Yannay-Cohen
- Department of Biochemistry, The Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
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Gallicano GI. A New Approach to Investigating Embryonic Stem Cell Differentiation. Stem Cells Dev 2009; 18:201-4. [DOI: 10.1089/scd.2008.0394] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- G. Ian Gallicano
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University Medical Center, Washington, DC
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Yagil Z, Kay G, Nechushtan H, Razin E. A Specific Epitope of Protein Inhibitor of Activated STAT3 Is Responsible for the Induction of Apoptosis in Rat Transformed Mast Cells. THE JOURNAL OF IMMUNOLOGY 2009; 182:2168-75. [DOI: 10.4049/jimmunol.0803030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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41
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Hou L, Pavan WJ. Transcriptional and signaling regulation in neural crest stem cell-derived melanocyte development: do all roads lead to Mitf? Cell Res 2008; 18:1163-76. [PMID: 19002157 DOI: 10.1038/cr.2008.303] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Human neurocristopathies include a number of syndromes, tumors, and dysmorphologies of neural crest (NC) stem cell derivatives. In recent years, many white spotting genes have been associated with hypopigmentary disorders and deafness in neurocristopathies resulting from NC stem cell-derived melanocyte deficiency during development. These include PAX3, SOX10, MITF, SNAI2, EDNRB, EDN3, KIT, and KITL. Recent studies have revealed surprising new insights into a central role of MITF in the complex network of interacting genes in melanocyte development. In this perspective, we provide an overview of some of the current findings and explore complex functional roles of these genes during NC stem cell-derived melanocyte development.
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Affiliation(s)
- Ling Hou
- State Key Laboratory Cultivation Base and Key Laboratory of Vision Science of China Ministry of Health, Eye Hospital, Wenzhou Medical College, 270 Xueyuan Road, Wenzhou, Zhejiang 325003, China.
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PIAS3 negatively regulates RANKL-mediated osteoclastogenesis directly in osteoclast precursors and indirectly via osteoblasts. Blood 2008; 113:2202-12. [PMID: 18952894 DOI: 10.1182/blood-2008-06-162594] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Cytokine signaling via various transcription factors regulates receptor activator of nuclear factor (NF)-kappaB ligand (RANKL)-mediated osteoclast differentiation from monocyte/macrophage lineage cells involved in propagation and resolution of inflammatory bone destruction. Protein inhibitor of activated STAT3 (PIAS3) was initially identified as a molecule that inhibits DNA binding of STAT3 and regulates many transcription factors through distinct mechanisms. To analyze PIAS3 function in osteoclasts in vivo, we have generated transgenic mice in which PIAS3 is specifically expressed in the osteoclast lineage using the tartrate-resistant acid phosphatase (TRAP) gene promoter. PIAS3 transgenic mice showed an osteopetrotic phenotype due to impairment of osteoclast differentiation. Overexpression of PIAS3 in RAW264.7 cells suppressed RANKL-induced osteoclastogenesis by inhibiting the expression of c-Fos and NFATc1. Interestingly, PIAS3 inhibits the transcriptional activity of microphthalmia-associated transcription factor (MITF) independent of sumoylation. Down-regulation of PIAS3 markedly enhances RANKL-mediated osteoclastogenesis in RAW264.7 cells. Furthermore, overexpression of PIAS3 in mouse primary osteoblast (POB), down-regulates RANKL expression induced by interleukin-6 (IL-6) cytokine family, and inhibits osteoclast formation from bone marrow macrophages (BMMs) in vitro coculture system. Down-regulation of PIAS3 leads to the accelerated expression of RANKL in POB stimulated with IL-6 and soluble IL-6 receptor (sIL-6R). Taken together, our results clearly indicate that PIAS3 negatively regulates RANKL-mediated osteoclastogenesis directly in osteoclast precursors and indirectly via osteoblasts.
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Diadenosine tetraphosphate hydrolase is part of the transcriptional regulation network in immunologically activated mast cells. Mol Cell Biol 2008; 28:5777-84. [PMID: 18644867 DOI: 10.1128/mcb.00106-08] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We previously discovered that microphthalmia transcription factor (MITF) and upstream stimulatory factor 2 (USF2) each forms a complex with its inhibitor histidine triad nucleotide-binding 1 (Hint-1) and with lysyl-tRNA synthetase (LysRS). Moreover, we showed that the dinucleotide diadenosine tetraphosphate (Ap(4)A), previously shown to be synthesized by LysRS, binds to Hint-1, and as a result the transcription factors are released from their suppression. Thus, transcriptional activity is regulated by Ap(4)A, suggesting that Ap(4)A is a second messenger in this context. For Ap(4)A to be unambiguously established as a second messenger, several criteria have to be fulfilled, including the presence of a metabolizing enzyme. Since several enzymes are able to hydrolyze Ap(4)A, we provided here evidence that the "Nudix" type 2 gene product, Ap(4)A hydrolase, is responsible for Ap(4)A degradation following the immunological activation of mast cells. The knockdown of Ap(4)A hydrolase modulated Ap(4)A accumulation, resulting in changes in the expression of MITF and USF2 target genes. Moreover, our observations demonstrated that the involvement of Ap(4)A hydrolase in gene regulation is not a phenomenon exclusive to mast cells but can also be found in cardiac cells activated with the beta-agonist isoproterenol. Thus, we have provided concrete evidence establishing Ap(4)A as a second messenger in the regulation of gene expression.
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Abstract
The network of transcription factors in mast cells has not been investigated as widely as it has been in other differentiated hematopoietic cells. There are still many mechanisms of transcriptional regulation that need to be fully elucidated to understand how mast cell external stimuli lead to the appropriate physiological responses. Such information could be used to determine potential therapeutic targets for the control of mast cell activation in inflammatory diseases, allergy, and asthma. The aim of this article is to review hallmark studies in the field of transcription factor regulation in mast cells. We elaborate especially on several transcription factors studied in our laboratory in the past decade, including activator protein-1, microphthalmia-associated transcription factor, upstream stimulating factor-2, and signal transducer and activator of transcription 3.
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Kim K, Lee J, Kim JH, Jin HM, Zhou B, Lee SY, Kim N. Protein inhibitor of activated STAT 3 modulates osteoclastogenesis by down-regulation of NFATc1 and osteoclast-associated receptor. THE JOURNAL OF IMMUNOLOGY 2007; 178:5588-94. [PMID: 17442941 DOI: 10.4049/jimmunol.178.9.5588] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Protein inhibitor of activated STAT3 (PIAS3) has been shown to regulate the activity of various transcription factors. In this study, we show that the overexpression of PIAS3 in bone marrow-derived monocyte/macrophage lineage cells attenuates osteoclast formation and down-regulates the expression of NFATc1 and osteoclast-associated receptor (OSCAR), which are important modulators in osteoclastogenesis. PIAS3 has been shown to associate with histone deacetylase 1 as well as with transcription factors, including the microphthalmia transcription factor, NFATc1, and c-Fos. Moreover, overexpression of PIAS3 inhibits the transactivation of target genes such as NFATc1 and OSCAR. This inhibitory effect of PIAS3 is possibly mediated by histone deacetylase 1 recruitment to the promoter regions of NFATc1 and OSCAR. Furthermore, silencing of PIAS3 by RNA interference in osteoclast precursors enhances osteoclast formation as well as gene expression of NFATc1 and OSCAR. Taken together, our results reveal that PIAS3 acts as a modulator in osteoclastogenesis.
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Affiliation(s)
- Kabsun Kim
- Research Institute of Medical Sciences and Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hak-Dong 5, Dong-Ku, Gwangju, Korea
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46
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Tshori S, Sonnenblick A, Yannay-Cohen N, Kay G, Nechushtan H, Razin E. Microphthalmia transcription factor isoforms in mast cells and the heart. Mol Cell Biol 2007; 27:3911-9. [PMID: 17438132 PMCID: PMC1900032 DOI: 10.1128/mcb.01455-06] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The microphthalmia transcription factor (Mitf) is critical for the survival and differentiation of a variety of cell types. While on the transcript level it has been noted that melanocytes and cardiomyocytes express specific Mitf isoforms, mast cells express several isoforms, mainly Mitf-H and Mitf-MC, whose function has not been thoroughly investigated. We found that in mast cells the expression of the specific Mitf isoforms is dependent on physiological stimuli that cause a major shifting of promoter usage and internal splicing. For example, activation of the c-kit signaling pathway almost totally abolished one of the main splice isoforms. Since cardiomyocytes express only the Mitf-H isoform, they were an ideal system to determine this isoform's physiological role. We identified that the expression of myosin light-chain 1a (MLC-1a) is regulated by Mitf-H. Interestingly, the transactivation of MLC-1a by Mitf-H in cardiomyocytes is decreased by overexpression of the splice form with exon 6a. In conclusion, we found that there is physiological switching of Mitf isoforms and that the promoter context and the cell context have a combined influence on gene expression programs.
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Affiliation(s)
- Sagi Tshori
- Department of Biochemistry, Hebrew University Medical School, Jerusalem 91120, Israel
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Schepsky A, Bruser K, Gunnarsson GJ, Goodall J, Hallsson JH, Goding CR, Steingrimsson E, Hecht A. The microphthalmia-associated transcription factor Mitf interacts with beta-catenin to determine target gene expression. Mol Cell Biol 2006; 26:8914-27. [PMID: 17000761 PMCID: PMC1636837 DOI: 10.1128/mcb.02299-05] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Commitment to the melanocyte lineage is characterized by the onset of expression of the microphthalmia-associated transcription factor (Mitf). This transcription factor plays a fundamental role in melanocyte development and maintenance and seems to be crucial for the survival of malignant melanocytes. Furthermore, Mitf has been shown to be involved in cell cycle regulation and to play important functions in self-renewal and maintenance of melanocyte stem cells. Although little is known about how Mitf regulates these various processes, one possibility is that Mitf interacts with other regulators. Here we show that Mitf can interact directly with beta-catenin, the key mediator of the canonical Wnt signaling pathway. The Wnt signaling pathway plays a critical role in melanocyte development and is intimately involved in triggering melanocyte stem cell proliferation. Significantly, constitutive activation of this pathway is a feature of a number of cancers including malignant melanoma. Here we show that Mitf can redirect beta-catenin transcriptional activity away from canonical Wnt signaling-regulated genes toward Mitf-specific target promoters to activate transcription. Thus, by a feedback mechanism, Mitf can diversify the output of canonical Wnt signaling to enhance the repertoire of genes regulated by beta-catenin. Our results reveal a novel mechanism by which Wnt signaling and beta-catenin activate gene expression, with significant implications for our understanding of both melanocyte development and melanoma.
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Affiliation(s)
- Alexander Schepsky
- Biochemistry and Molecular Biology, Faculty of Medicine, University of Iceland, Vatnsmyrarvegur 16, 101 Reykjavik, Iceland
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Tshori S, Gilon D, Beeri R, Nechushtan H, Kaluzhny D, Pikarsky E, Razin E. Transcription factor MITF regulates cardiac growth and hypertrophy. J Clin Invest 2006; 116:2673-81. [PMID: 16998588 PMCID: PMC1570375 DOI: 10.1172/jci27643] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2005] [Accepted: 08/08/2006] [Indexed: 12/19/2022] Open
Abstract
High levels of microphthalmia transcription factor (MITF) expression have been described in several cell types, including melanocytes, mast cells, and osteoclasts. MITF plays a pivotal role in the regulation of specific genes in these cells. Although its mRNA has been found to be present in relatively high levels in the heart, its cardiac role has never been explored. Here we show that a specific heart isoform of MITF is expressed in cardiomyocytes and can be induced by beta-adrenergic stimulation but not by paired box gene 3 (PAX3), the regulator of the melanocyte MITF isoform. In 2 mouse strains with different MITF mutations, heart weight/body weight ratio was decreased as was the hypertrophic response to beta-adrenergic stimulation. These mice also demonstrated a tendency to sudden death following beta-adrenergic stimulation. Most impressively, 15-month-old MITF-mutated mice had greatly decreased heart weight/body weight ratio, systolic function, and cardiac output. In contrast with normal mice, in the MITF-mutated mice, beta-adrenergic stimulation failed to induce B-type natriuretic peptide (BNP), an important modulator of cardiac hypertrophy, while atrial natriuretic peptide levels and phosphorylated Akt were increased, suggesting a cardiac stress response. In addition, cardiomyocytes cultured with siRNA against MITF showed a substantial decrease in BNP promoter activity. Thus, for what we believe is the first time, we have demonstrated that MITF plays an essential role in beta-adrenergic-induced cardiac hypertrophy.
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Affiliation(s)
- Sagi Tshori
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Dan Gilon
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Ronen Beeri
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Hovav Nechushtan
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Dmitry Kaluzhny
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Eli Pikarsky
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
| | - Ehud Razin
- Department of Biochemistry, Hebrew University Medical School, Jerusalem, Israel.
Heart Institute,
Department of Oncology, and
Department of Pathology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
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Levy C, Khaled M, Fisher DE. MITF: master regulator of melanocyte development and melanoma oncogene. Trends Mol Med 2006; 12:406-14. [PMID: 16899407 DOI: 10.1016/j.molmed.2006.07.008] [Citation(s) in RCA: 791] [Impact Index Per Article: 43.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2006] [Revised: 07/06/2006] [Accepted: 07/28/2006] [Indexed: 01/11/2023]
Abstract
Microphthalmia-associated transcription factor (MITF) acts as a master regulator of melanocyte development, function and survival by modulating various differentiation and cell-cycle progression genes. It has been demonstrated that MITF is an amplified oncogene in a fraction of human melanomas and that it also has an oncogenic role in human clear cell sarcoma. However, MITF also modulates the state of melanocyte differentiation. Several closely related transcription factors also function as translocated oncogenes in various human malignancies. These data place MITF between instructing melanocytes towards terminal differentiation and/or pigmentation and, alternatively, promoting malignant behavior. In this review, we survey the roles of MITF as a master lineage regulator in melanocyte development and its emerging activities in malignancy. Understanding the molecular function of MITF and its associated pathways will hopefully shed light on strategies for improving therapeutic approaches for these diseases.
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Affiliation(s)
- Carmit Levy
- Melanoma Program and Department of Pediatric Hematology and Oncology, Dana-Farber Cancer Institute, Children's Hospital Boston, 44 Binney Street, Boston, MA 02115, USA
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50
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Okayama Y, Kawakami T. Development, migration, and survival of mast cells. Immunol Res 2006; 34:97-115. [PMID: 16760571 PMCID: PMC1490026 DOI: 10.1385/ir:34:2:97] [Citation(s) in RCA: 294] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/1999] [Revised: 11/30/1999] [Accepted: 11/30/1999] [Indexed: 12/16/2022]
Abstract
Mast cells play a pivotal role in immediate hypersensitivity and chronic allergic reactions that can contribute to asthma, atopic dermatitis, and other allergic diseases. Because mast cell numbers are increased at sites of inflammation in allergic diseases, pharmacologic intervention into the proliferation, migration, and survival (or apoptosis) of mast cells could be a promising strategy for the management of allergic diseases. Mast cells differentiate from multipotent hematopoietic progenitors in the bone marrow. Stem cell factor (SCF) is a major chemotactic factor for mast cells and their progenitors. SCF also elicits cell-cell and cell-substratum adhesion, facilitates the proliferation, and sustains the survival, differentiation, and maturation, of mast cells. Therefore, many aspects of mast cell biology can be understood as interactions of mast cells and their precursors with SCF and factors that modulate their responses to SCF and its signaling pathways. Numerous factors known to have such a capacity include cytokines that are secreted from activated T cells and other immune cells including mast cells themselves. Recent studies also demonstrated that monomeric IgE binding to FcepsilonRI can enhance mast-cell survival. In this review we discuss the factors that regulate mast cell development, migration, and survival.
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Affiliation(s)
- Yoshimichi Okayama
- Research Unit for Allergy Transcriptome, Research Center for Allergy and Immunology, RIKEN Yokohama Institute, Yokohama, Japan
| | - Toshiaki Kawakami
- Division of Cell Biology, La Jolla Institute for Allergy and Immunology, San Diego, CA
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