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Lin R, Zhao F, Xiong T, Lai L, Li H, Lin W, Xiao T, Lin W. Genetic mapping identifies SNP mutations in MITF-M promoter associated with melanin formation in Putian black duck. Poult Sci 2024; 103:103191. [PMID: 37980740 PMCID: PMC10679944 DOI: 10.1016/j.psj.2023.103191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/06/2023] [Accepted: 10/09/2023] [Indexed: 11/21/2023] Open
Abstract
The coloration of plumage in poultry species has substantial economic significance. Putian black ducks encompass 2 distinct strains characterized by black and white plumage variations resulting from selective breeding. This study aimed to identify the molecular mechanisms responsible for plumage coloration in these 2 distinct strains. A comprehensive genome-wide association study was conducted using DNA data sourced from a F2 segregating population, consisting of 71 individuals with black plumage and 39 individuals with white plumage, derived from these distinct 2 strains. This analysis revealed that 894 nucleotide polymorphisms and identified 58 candidate genes. Subsequent Gene Ontology and Kyoto Encyclopedia of Genes and Genomes coenrichment analyses identified MITF as a key candidate gene implicated in melanin biosynthesis. Furthermore, extensive screening of significant polymorphic loci within MITF was carried out via mass spectrometry in 3 distinct populations: 100 individuals with black plumage and 100 individuals with white plumage from the F0 generation; and 50 with black plumage form the F1 generation). Eighteen candidate polymorphic loci were identified demonstrating significant associations with variations in black and white plumage. Notably, 8 of these loci were located within the 2,000 bp region upstream of MITF-M. To validate the critical regulatory role of MITF-M in black and white plumage formation, a dual-fluorescence reporter system was constructed, and dual-fluorescence activity was assessed. The results revealed that the fluorescence activity at wild-type sites (corresponding to black plumage) was significantly higher than that at the mutant-type sites (associated with white plumage) (P < 0.01). To corroborate the pivotal role of MITF-M in black and white plumage formation, qPCR was employed to evaluate the expression levels of various MITF variants in black and white feather bulbs. This analysis demonstrated that only MITF-M exhibited specific expression in black feather bulbs. These results elucidate the central role of polymorphic mutations within the MITF promoter region in the regulation of black and white plumage coloration in Putian black ducks. This study extends our understanding of mechanisms governing duck plumage coloration and provides valuable molecular markers for future research in duck production and breeding based on plumage coloration.
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Affiliation(s)
- Ruiyi Lin
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Fanglu Zhao
- Department of Animal Science, Jiangxi Biological Vocational College, No. 608 Nanlian Road, Nanchang 330200, China
| | - Taimin Xiong
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Lianjie Lai
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Huihuang Li
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Weilong Lin
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Tianfang Xiao
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Weimin Lin
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
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2
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Brown AD, Lynch K, Langelaan DN. The C-terminal transactivation domain of MITF interacts promiscuously with co-activator CBP/p300. Sci Rep 2023; 13:16094. [PMID: 37752231 PMCID: PMC10522771 DOI: 10.1038/s41598-023-43207-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 09/21/2023] [Indexed: 09/28/2023] Open
Abstract
The microphthalmia-associated transcription factor (MITF) is one of four closely related members of the MiT/TFE family (TFEB, TFE3, TFEC) that regulate a wide range of cellular processes. MITF is a key regulator of melanocyte-associated genes, and essential to proper development of the melanocyte cell lineage. Abnormal MITF activity can contribute to the onset of several diseases including melanoma, where MITF is an amplified oncogene. To enhance transcription, MITF recruits the co-activator CREB-binding protein (CBP) and its homolog p300 to gene promoters, however the molecular determinants of their interaction are not yet fully understood. Here, we characterize the interactions between the C-terminal MITF transactivation domain and CBP/p300. Using NMR spectroscopy, protein pulldown assays, and isothermal titration calorimetry we determine the C-terminal region of MITF is intrinsically disordered and binds with high-affinity to both TAZ1 and TAZ2 of CBP/p300. Mutagenesis studies revealed two conserved motifs within MITF that are necessary for TAZ2 binding and critical for MITF-dependent transcription of a reporter gene. Finally, we observe the transactivation potential of the MITF C-terminal region is reliant on the N-terminal transactivation domain for function. Taken together, our study helps elucidate the molecular details of how MITF interacts with CBP/p300 through multiple redundant interactions that lend insight into MITF function in melanocytes and melanoma.
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Affiliation(s)
- Alexandra D Brown
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
| | - Kyle Lynch
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
| | - David N Langelaan
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada.
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3
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Guo Y, Wu W, Yang X. Coordinated microRNA/mRNA Expression Profiles Reveal Unique Skin Color Regulatory Mechanisms in Chinese Giant Salamander (Andrias davidianus). Animals (Basel) 2023; 13:ani13071181. [PMID: 37048437 PMCID: PMC10093658 DOI: 10.3390/ani13071181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/18/2023] [Accepted: 03/24/2023] [Indexed: 03/30/2023] Open
Abstract
The Chinese giant salamander (Andrias davidianus) has been increasingly popular in the aquaculture market in China in recent years. In the breeding process of Andrias davidianus, we found that some albino individuals were extremely rare and could not be inherited stably, which severely limits their commercialization in the aquaculture market. In this study, we performed transcriptome and small RNA (sRNA) sequencing analyses in the skin samples of wild-type (WT) and albino (AL) Andrias davidianus. In total, among 5517 differentially expressed genes (DEGs), 2911 DEGs were down-regulated in AL, including almost all the key genes involved in melanin formation. A total of 25 miRNAs were differentially expressed in AL compared to WT, of which 17 were up-regulated. Through the integrated analysis, no intersection was found between the target genes of the differentially expressed miRNAs and the key genes for melanin formation. Gene Ontology (GO) and KEGG pathway analyses on DEGs showed that these genes involved multiple processes relevant to melanin synthesis and the key signal pathway MAPK. Interestingly, the transcription factors SOX10 and PAX3 and the Wnt signaling pathway that play a key role in other species were not included, while the other two transcription factors in the SOX family, SOX21 and SOX7, were included. After analyzing the key genes for melanin formation, it was interesting to note an alternative splicing form of the MITF in WT and a critical mutation of the SLC24A5 gene in AL, which might be the main reason for the skin color change of Andrias davidianus. The results contributed to understanding the molecular mechanism of skin pigmentation in Andrias davidianus and accelerating the acquisition process of individuals with specific body colors by genetic means.
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Agostini F, Agostinis R, Medina DL, Bisaglia M, Greggio E, Plotegher N. The Regulation of MiTF/TFE Transcription Factors Across Model Organisms: from Brain Physiology to Implication for Neurodegeneration. Mol Neurobiol 2022; 59:5000-5023. [PMID: 35665902 PMCID: PMC9363479 DOI: 10.1007/s12035-022-02895-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 05/21/2022] [Indexed: 12/30/2022]
Abstract
The microphthalmia/transcription factor E (MiTF/TFE) transcription factors are responsible for the regulation of various key processes for the maintenance of brain function, including autophagy-lysosomal pathway, lipid catabolism, and mitochondrial homeostasis. Among them, autophagy is one of the most relevant pathways in this frame; it is evolutionary conserved and crucial for cellular homeostasis. The dysregulation of MiTF/TFE proteins was shown to be involved in the development and progression of neurodegenerative diseases. Thus, the characterization of their function is key in the understanding of the etiology of these diseases, with the potential to develop novel therapeutics targeted to MiTF/TFE proteins and to the autophagic process. The fact that these proteins are evolutionary conserved suggests that their function and dysfunction can be investigated in model organisms with a simpler nervous system than the mammalian one. Building not only on studies in mammalian models but also in complementary model organisms, in this review we discuss (1) the mechanistic regulation of MiTF/TFE transcription factors; (2) their roles in different regions of the central nervous system, in different cell types, and their involvement in the development of neurodegenerative diseases, including lysosomal storage disorders; (3) the overlap and the compensation that occur among the different members of the family; (4) the importance of the evolutionary conservation of these protein and the process they regulate, which allows their study in different model organisms; and (5) their possible role as therapeutic targets in neurodegeneration.
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Affiliation(s)
| | - Rossella Agostinis
- Telethon Institute of Genetics and Medicine (TIGEM), Pozzuoli, Naples, Italy
- Scuola Superiore Meridionale SSM, Federico II University, Naples, Italy
| | - Diego L Medina
- Telethon Institute of Genetics and Medicine (TIGEM), Pozzuoli, Naples, Italy
- Department of Medical and Translational, Science, II University, Naples, Federico, Italy
| | - Marco Bisaglia
- Department of Biology, University of Padova, Padua, Italy
| | - Elisa Greggio
- Department of Biology, University of Padova, Padua, Italy
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Gómez-Romero L, Alvarez-Suarez DE, Hernández-Lemus E, Ponce-Castañeda MV, Tovar H. The regulatory landscape of retinoblastoma: a pathway analysis perspective. ROYAL SOCIETY OPEN SCIENCE 2022; 9:220031. [PMID: 35620002 PMCID: PMC9114937 DOI: 10.1098/rsos.220031] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 04/13/2022] [Indexed: 05/03/2023]
Abstract
Retinoblastoma (Rb) is a rare intraocular tumour in early childhood, with an approximate incidence of 1 in 18 000 live births. Experimental studies for Rb are complex due to the challenges associated with obtaining a normal retina to contrast with diseased tissue. In this work, we reanalyse a dataset that contains normal retina samples. We identified the individual genes whose expression is different in Rb in contrast with normal tissue, determined the pathways whose global expression pattern is more distant from the global expression observed in normal tissue, and finally, we identified which transcription factors regulate the highest number of differentially expressed genes (DEGs) and proposed as transcriptional master regulators (TMRs). The enrichment of DEGs in the phototransduction and retrograde endocannabinoid signalling pathways could be associated with abnormal behaviour of the processes leading to cellular differentiation and cellular proliferation. On the other hand, the TMRs nuclear receptor subfamily 5 group A member 2 and hepatocyte nuclear factor 4 gamma are involved in hepatocyte differentiation. Therefore, the enrichment of aberrant expression in these transcription factors could suggest an abnormal retina development that could be involved in Rb origin and progression.
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Affiliation(s)
- Laura Gómez-Romero
- Computational Genomics Division, National Institute of Genomic Medicine (INMEGEN), Mexico City, Mexico
| | - Diana E. Alvarez-Suarez
- Medical Research Unit in Infectious Diseases, Hospital de Pediatría, CMN SXXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
- Pharmacology Department, CINVESTAV, Mexico City, Mexico
| | - Enrique Hernández-Lemus
- Computational Genomics Division, National Institute of Genomic Medicine (INMEGEN), Mexico City, Mexico
- Center for Complexity Sciences, National Autonomous University of Mexico (UNAM), Mexico City, Mexico
| | - M. Verónica Ponce-Castañeda
- Medical Research Unit in Infectious Diseases, Hospital de Pediatría, CMN SXXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Hugo Tovar
- Computational Genomics Division, National Institute of Genomic Medicine (INMEGEN), Mexico City, Mexico
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Zardadi S, Rayat S, Hassani Doabsari M, Keramatipour M, Morovvati S. Waardenburg syndrome type 2A in a large Iranian family with a novel MITF gene mutation. BMC Med Genomics 2021; 14:230. [PMID: 34544414 PMCID: PMC8451132 DOI: 10.1186/s12920-021-01074-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 09/02/2021] [Indexed: 11/29/2022] Open
Abstract
Background The characteristics of Waardenburg syndrome (WS) as a scarce heritable disorder are sensorineural hearing loss and deficits of pigmentation in the skin, hair, and eye. Here, clinical features and detection of the mutation in the MITF gene of WS2 patients are reported in a sizable Iranian family.
Methods A man aged 28-years represented with symptoms of mild unilateral hearing loss (right ear), complete heterochromia iridis, premature graying prior to 30 years of age, and synophrys. In this research, there was a sizable family in Iran comprising three generations with seven WS patients and two healthy members. Whole exome sequencing was applied for proband for the identification of the candidate genetic mutations associated with the disease. The detected mutation in proband and investigated family members was validated by PCR-Sanger sequencing. Results A novel heterozygous mutation, NM_198159.3:c.1026dup p.(Asn343Glufs*27), in exon 9 of the MITF gene co-segregated with WS2 in the affected family members. The variant was forecasted as a disease-causing variant by the Mutation Taster. According to the UniProt database, this variant has been located in basic helix-loop-helix (bHLH) domain of the protein with critical role in DNA binding. Conclusions A frameshift was caused by a nucleotide insertion, c.1026dup, in exon 9 of the MITF gene. This mutation is able to induce an early termination, resulting in forming a truncated protein capable of affecting the normal function of the MITF protein. Helpful information is provided through an exactly described mutations involved in WS to clarify the molecular cause of clinical characteristics of WS and have a contribution to better genetic counseling of WS patients. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-021-01074-y.
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Affiliation(s)
- Safoura Zardadi
- Department of Biology, School of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Sima Rayat
- Department of Biology, School of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | - Mohammad Keramatipour
- Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Saeid Morovvati
- Department of Genetics, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
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7
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Zhang J, Mou Y, Gong H, Chen H, Xiao H. Microphthalmia-Associated Transcription Factor in Senescence and Age-Related Diseases. Gerontology 2021; 67:708-717. [PMID: 33940580 DOI: 10.1159/000515525] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 02/27/2021] [Indexed: 02/05/2023] Open
Abstract
Although microphthalmia-associated transcription factor (MITF) has been known for decades as a key regulator for melanocytic differentiation, recent studies expanded its other roles in multiple biological processes. Among these newfound roles, the relationship between MITF and aging is attractive; however, the underlying mechanism remains elusive. Here, we review the documented cues that highlight the implication of MITF in the aging process and particularly discuss the possible mechanisms underlying the participation of MITF in cellular senescence. First, it summarizes the association of MITF with melanocytic senescence, including the roles of MITF in cell cycle regulation, DNA damage repair, oxidative stress response, and the generation of senescence-associated secretory phenotype. Then, it collects the information involving MITF-related senescent changes in nonmelanocytes, such as retinal pigment epithelium cells, osteoclasts, and cardiomyocytes. This review may deepen the understanding of MITF function and be helpful to develop new strategies for improving geriatric health.
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Affiliation(s)
- Jian Zhang
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Yi Mou
- Geroscience and Chronic Disease Department, The 8th Municipal Hospital for the People, Chengdu, China
| | - Hui Gong
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Honghan Chen
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Hengyi Xiao
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
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Lim D, Lee KJ, Kim Y, Kim M, Ju HM, Kim MJ, Choi DH, Choi J, Kim S, Kang D, Lee K, Hahn JH. A Basic Domain-Derived Tripeptide Inhibits MITF Activity by Reducing its Binding to the Promoter of Target Genes. J Invest Dermatol 2021; 141:2459-2469. [PMID: 33823181 DOI: 10.1016/j.jid.2021.01.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 12/23/2020] [Accepted: 01/20/2021] [Indexed: 12/28/2022]
Abstract
The keratinocytes in UV-irradiated skin produce and secrete α-melanocyte-stimulating hormone. α-Melanocyte-stimulating hormone upregulates the expression of MITF in melanocytes through the cAMP‒protein kinase A‒CREB signaling pathway. Thereafter, MITF induces the expression of melanogenic genes, including the tyrosinase gene TYR and TYRP-1 and TYRP-2 genes, which leads to the synthesis and accumulation of melanin. In this study, we examined whether MITF basic region-derived tripeptides can bind to the DNA-binding domain of MITF and inhibit MITF-induced melanogenesis through the inhibition of MITF‒DNA binding. MITF-KGR, a representative MITF-derived tripeptide, suppressed the transcriptional activity of MITF by disrupting its binding to the promoter region of the target genes, which resulted in the inhibition of skin epidermis thickness and melanin synthesis in vivo and in vitro. Our results indicate that MITF-KGR exerts an inhibitory effect on melanogenesis by targeting MITF.
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Affiliation(s)
- Dongyoung Lim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Kyoung-Jin Lee
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Yuri Kim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Minseo Kim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Hyun-Mi Ju
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Myoung-Ju Kim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Dong-Hwa Choi
- Biocenter, Gyeonggido Business & Science Accelerator, Suwon, Republic of Korea
| | - Jiwon Choi
- Department of Oral Pathology, Oral Cancer Research Institute, College of Dentistry, Yonsei University, Seoul, Republic of Korea
| | - Suree Kim
- Department of Life Science, Ewha Womans University, Seoul, Republic of Korea; Western Seoul Center, Korea Basic Science Institute, Seoul, Republic of Korea
| | - Dongmin Kang
- Department of Life Science, Ewha Womans University, Seoul, Republic of Korea
| | - Kyoungyul Lee
- Department of Pathology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Jang-Hee Hahn
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea.
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Čermák V, Škarková A, Merta L, Kolomazníková V, Palušová V, Uldrijan S, Rösel D, Brábek J. RNA-seq Characterization of Melanoma Phenotype Switch in 3D Collagen after p38 MAPK Inhibitor Treatment. Biomolecules 2021; 11:biom11030449. [PMID: 33802847 PMCID: PMC8002814 DOI: 10.3390/biom11030449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/08/2021] [Accepted: 03/15/2021] [Indexed: 12/30/2022] Open
Abstract
Melanoma phenotype plasticity underlies tumour dissemination and resistance to therapy, yet its regulation is incompletely understood. In vivo switching between a more differentiated, proliferative phenotype and a dedifferentiated, invasive phenotype is directed by the tumour microenvironment. We found that treatment of partially dedifferentiated, invasive A375M2 cells with two structurally unrelated p38 MAPK inhibitors, SB2021920 and BIRB796, induces a phenotype switch in 3D collagen, as documented by increased expression of melanocyte differentiation markers and a loss of invasive phenotype markers. The phenotype is accompanied by morphological change corresponding to amoeboid–mesenchymal transition. We performed RNA sequencing with an Illumina HiSeq platform to fully characterise transcriptome changes underlying the switch. Gene expression results obtained with RNA-seq were validated by comparing them with RT-qPCR. Transcriptomic data generated in the study will extend the present understanding of phenotype plasticity in melanoma and its contribution to invasion and metastasis.
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Affiliation(s)
- Vladimír Čermák
- Department of Cell Biology, Charles University, Viničná 7, 128 44 Prague, Czech Republic; (V.Č.); (A.Š.); (L.M.); (V.K.); (D.R.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 252 42 Vestec u Prahy, Czech Republic
| | - Aneta Škarková
- Department of Cell Biology, Charles University, Viničná 7, 128 44 Prague, Czech Republic; (V.Č.); (A.Š.); (L.M.); (V.K.); (D.R.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 252 42 Vestec u Prahy, Czech Republic
| | - Ladislav Merta
- Department of Cell Biology, Charles University, Viničná 7, 128 44 Prague, Czech Republic; (V.Č.); (A.Š.); (L.M.); (V.K.); (D.R.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 252 42 Vestec u Prahy, Czech Republic
| | - Veronika Kolomazníková
- Department of Cell Biology, Charles University, Viničná 7, 128 44 Prague, Czech Republic; (V.Č.); (A.Š.); (L.M.); (V.K.); (D.R.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 252 42 Vestec u Prahy, Czech Republic
| | - Veronika Palušová
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic; (V.P.); (S.U.)
- International Clinical Research Center, St. Anne’s University Hospital, Pekařská 53, 656 91 Brno, Czech Republic
| | - Stjepan Uldrijan
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic; (V.P.); (S.U.)
- International Clinical Research Center, St. Anne’s University Hospital, Pekařská 53, 656 91 Brno, Czech Republic
| | - Daniel Rösel
- Department of Cell Biology, Charles University, Viničná 7, 128 44 Prague, Czech Republic; (V.Č.); (A.Š.); (L.M.); (V.K.); (D.R.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 252 42 Vestec u Prahy, Czech Republic
| | - Jan Brábek
- Department of Cell Biology, Charles University, Viničná 7, 128 44 Prague, Czech Republic; (V.Č.); (A.Š.); (L.M.); (V.K.); (D.R.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 252 42 Vestec u Prahy, Czech Republic
- Correspondence: ; Tel./Fax: +420-3258-73900
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Zardadi S, Rayat S, Doabsari MH, Alishiri A, Keramatipour M, Shahri ZJ, Morovvati S. Four mutations in MITF, SOX10 and PAX3 genes were identified as genetic causes of waardenburg syndrome in four unrelated Iranian patients: case report. BMC Pediatr 2021; 21:70. [PMID: 33557787 PMCID: PMC7869501 DOI: 10.1186/s12887-021-02521-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 01/24/2021] [Indexed: 12/30/2022] Open
Abstract
Background Waardenburg syndrome (WS) is a rare genetic disorder. The purpose of this study was to investigate clinical and molecular characteristics of WS in four probands from four different Iranian families. Case presentation The first patient was a 1-year-old symptomatic boy with congenital hearing loss and heterochromia iridis with a blue segment in his left iris. The second case was a 1.5-year-old symptomatic girl who manifested congenital profound hearing loss, brilliant blue eyes, and skin hypopigmentation on the abdominal region at birth time. The third patient was an 8-month-old symptomatic boy with developmental delay, mild atrophy, hypotonia, brilliant blue eyes, skin hypopigmentation on her hand and foot, Hirschsprung disease, and congenital profound hearing loss; the fourth patient was a 4-year-old symptomatic boy who showed dystopia canthorum, broad nasal root, synophrys, skin hypopigmentation on her hand and abdomen, brilliant blue eyes, and congenital profound hearing loss. Whole exome sequencing (WES) was used for each proband to identify the underlying genetic factor. Sanger sequencing was performed for validation of the identified mutations in probands and the available family members. A novel heterozygous frameshift mutation, c.996delT (p.K334Sfs*15), on exon 8 of the MITF gene was identified in the patient of the first family diagnosed with WS2A. Two novel de novo heterozygous mutations including a missense mutation, c.950G > A (p.R317K), on exon 8 of the MITF gene, and a frameshift mutation, c.684delC (p.E229Sfs*57), on the exon 3 of the SOX10 gene were detected in patients of the second and third families with WS2A and PCWH (Peripheral demyelinating neuropathy, Central dysmyelinating leukodystrophy, Waardenburg syndrome, Hirschsprung disease), respectively. A previously reported heterozygous frameshift mutation, c.1024_1040del AGCACGATTCCTTCCAA, (p.S342Pfs*62), on exon 7 of the PAX3 gene was identified in the patient of the fourth family with WS1. Conclusions An exact description of the mutations responsible for WS provides useful information to explain the molecular cause of clinical features of WS and contributes to better genetic counseling of WS patients and their families.
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Affiliation(s)
- Safoura Zardadi
- Department of Biology, School of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Sima Rayat
- Department of Biology, School of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | - Aliagha Alishiri
- Faculty of Medicine, Hormozgan University of Medical Sciences, Hormozgan, Iran
| | - Mohammad Keramatipour
- Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Zeynab Javanfekr Shahri
- School of Advanced Sciences and Technology, Islamic Azad University-Tehran Medical Sciences, Tehran, Iran
| | - Saeid Morovvati
- Department of Genetics, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
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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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12
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Vu HN, Dilshat R, Fock V, Steingrímsson E. User guide to MiT-TFE isoforms and post-translational modifications. Pigment Cell Melanoma Res 2020; 34:13-27. [PMID: 32846025 DOI: 10.1111/pcmr.12922] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 07/31/2020] [Accepted: 08/13/2020] [Indexed: 12/15/2022]
Abstract
The microphthalmia-associated transcription factor (MITF) is at the core of melanocyte and melanoma fate specification. The related factors TFEB and TFE3 have been shown to be instrumental for transcriptional regulation of genes involved in lysosome biogenesis and autophagy, cellular processes important for mediating nutrition signals and recycling of cellular materials, in many cell types. The MITF, TFEB, TFE3, and TFEC proteins are highly related. They share many structural and functional features and are targeted by the same signaling pathways. However, the existence of several isoforms of each factor and the increasing number of residues shown to be post-translationally modified by various signaling pathways poses a difficulty in indexing amino acid residues in different isoforms across the different proteins. Here, we provide a resource manual to cross-reference amino acids and post-translational modifications in all isoforms of the MiT-TFE family in humans, mice, and zebrafish and summarize the protein accession numbers for each isoform of these factors in the different genomic databases. This will facilitate future studies on the signaling pathways that regulate different isoforms of the MiT-TFE transcription factor family.
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Affiliation(s)
- Hong Nhung Vu
- Department of Biochemistry and Molecular Biology, BioMedical Center, Faculty of Medicine, University of Iceland, Reykjavík, Iceland
| | - Ramile Dilshat
- Department of Biochemistry and Molecular Biology, BioMedical Center, Faculty of Medicine, University of Iceland, Reykjavík, Iceland
| | - Valerie Fock
- Department of Biochemistry and Molecular Biology, BioMedical Center, Faculty of Medicine, University of Iceland, Reykjavík, Iceland
| | - Eiríkur Steingrímsson
- Department of Biochemistry and Molecular Biology, BioMedical Center, Faculty of Medicine, University of Iceland, Reykjavík, Iceland
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13
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Udry F, Decembrini S, Gamm DM, Déglon N, Kostic C, Arsenijevic Y. Lentiviral mediated RPE65 gene transfer in healthy hiPSCs-derived retinal pigment epithelial cells markedly increased RPE65 mRNA, but modestly protein level. Sci Rep 2020; 10:8890. [PMID: 32483256 PMCID: PMC7264209 DOI: 10.1038/s41598-020-65657-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 05/08/2020] [Indexed: 12/15/2022] Open
Abstract
The retinal pigment epithelium (RPE) is a monolayer of cobblestone-like epithelial cells that accomplishes critical functions for the retina. Several protocols have been published to differentiate pluripotent stem cells into RPE cells suitable for disease modelling and therapy development. In our study, the RPE identity of human induced pluripotent stem cell (hiPSC)-derived RPE (iRPE) was extensively characterized, and then used to test a lentiviral-mediated RPE65 gene augmentation therapy. A dose study of the lentiviral vector revealed a dose-dependent effect of the vector on RPE65 mRNA levels. A marked increase of the RPE65 mRNA was also observed in the iRPE (100-fold) as well as in an experimental set with RPE derived from another hiPSC source and from foetal human RPE. Although iRPE displayed features close to bona fide RPE, no or a modest increase of the RPE65 protein level was observed depending on the protein detection method. Similar results were observed with the two other cell lines. The mechanism of RPE65 protein regulation remains to be elucidated, but the current work suggests that high vector expression will not produce an excess of the normal RPE65 protein level.
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Affiliation(s)
- Florian Udry
- Department of ophthalmology, Unit of Retinal Degeneration and Regeneration, University of Lausanne, Hôpital ophtalmique Jules-Gonin, 1004, Lausanne, Switzerland
| | - Sarah Decembrini
- Department of ophthalmology, Unit of Retinal Degeneration and Regeneration, University of Lausanne, Hôpital ophtalmique Jules-Gonin, 1004, Lausanne, Switzerland
- Department of Biomedicine, University Hospital Basel & University Basel, Hebelstr. 20, 4031, Basel, Switzerland
| | - David M Gamm
- McPherson Eye Research Institute, Waisman Center and Department of Ophthalmology and Visual Sciences, and University of Wisconsin-Madison, Madison, USA
| | - Nicole Déglon
- Neuroscience Research Center, Laboratory of Neurotherapies and Neuromodulation, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Corinne Kostic
- Department of ophthalmology, Unit of Retinal Degeneration and Regeneration, University of Lausanne, Hôpital ophtalmique Jules-Gonin, 1004, Lausanne, Switzerland
| | - Yvan Arsenijevic
- Department of ophthalmology, Unit of Retinal Degeneration and Regeneration, University of Lausanne, Hôpital ophtalmique Jules-Gonin, 1004, Lausanne, Switzerland.
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14
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Flesher JL, Paterson-Coleman EK, Vasudeva P, Ruiz-Vega R, Marshall M, Pearlman E, MacGregor GR, Neumann J, Ganesan AK. Delineating the role of MITF isoforms in pigmentation and tissue homeostasis. Pigment Cell Melanoma Res 2019; 33:279-292. [PMID: 31562697 DOI: 10.1111/pcmr.12828] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 09/16/2019] [Accepted: 09/18/2019] [Indexed: 01/01/2023]
Abstract
MITF, a gene that is mutated in familial melanoma and Waardenburg syndrome, encodes multiple isoforms expressed from alternative promoters that share common coding exons but have unique amino termini. It is not completely understood how these isoforms influence pigmentation in different tissues and how the expression of these independent isoforms of MITF is regulated. Here, we show that melanocytes express two isoforms of MITF, MITF-A and MITF-M. The expression of MITF-A is partially regulated by a newly identified retinoid enhancer element located upstream of the MITF-A promoter. Mitf-A knockout mice have only subtle changes in melanin accumulation in the hair and reduced Tyr expression in the eye. In contrast, Mitf-M-null mice have enlarged kidneys, lack neural crest-derived melanocytes in the skin, choroid, and iris stroma, yet maintain pigmentation within the retinal pigment epithelium and iris pigment epithelium of the eye. Taken together, these studies identify a critical role for MITF-M in melanocytes, a minor role for MITF-A in regulating pigmentation in the hair and Tyr expression in the eye, and a novel role for MITF-M in size control of the kidney.
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Affiliation(s)
- Jessica L Flesher
- Department of Biological Chemistry, University of California, Irvine, CA, USA.,Center for Cancer Systems Biology, University of California, Irvine, CA, USA
| | | | - Priya Vasudeva
- Department of Dermatology, University of California, Irvine, CA, USA
| | - Rolando Ruiz-Vega
- Center for Cancer Systems Biology, University of California, Irvine, CA, USA.,Department of Developmental and Cell Biology, University of California, Irvine, CA, USA.,Center for Complex Biological Systems, University of California, Irvine, CA, USA
| | - Michaela Marshall
- Department of Ophthalmology, University of California, Irvine, CA, USA
| | - Eric Pearlman
- Department of Ophthalmology, University of California, Irvine, CA, USA
| | - Grant R MacGregor
- Department of Developmental and Cell Biology, University of California, Irvine, CA, USA.,Irvine Transgenic Mouse Facility, University Laboratory Animal Resources, Office of Research, Universitiy of California, Irvine, CA, USA
| | - Jonathan Neumann
- Irvine Transgenic Mouse Facility, University Laboratory Animal Resources, Office of Research, Universitiy of California, Irvine, CA, USA
| | - Anand K Ganesan
- Department of Biological Chemistry, University of California, Irvine, CA, USA.,Center for Cancer Systems Biology, University of California, Irvine, CA, USA.,Department of Dermatology, University of California, Irvine, CA, USA
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15
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Zavala G, Sandoval C, Meza D, Contreras R, Gubelin W, Khoury M. Differentiation of adipose-derived stem cells to functional CD105 neg CD73 low melanocyte precursors guided by defined culture condition. Stem Cell Res Ther 2019; 10:249. [PMID: 31399041 PMCID: PMC6688240 DOI: 10.1186/s13287-019-1364-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 12/18/2022] Open
Abstract
Background The generation of functional human epidermal melanocytes (HEM) from stem cells provides an unprecedented source for cell-based therapy in vitiligo. Despite the important efforts exerted to obtain melanin-producing cells from stem cells, pre-clinical results still lack the safety and scalability characteristics essential for their translational application. Methods Here, we report a rapid and efficient protocol based on defined culture conditions capable of differentiating adult adipose-derived stem cells (ADSC) to scalable amounts of proliferative melanocyte precursors (PreMel) within 30 days. PreMel were characterized in vitro through qPCR, Western blot, flow cytometry, biochemical assays, and in vivo assays in immunocompromised mice (NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ, or NSG). Results After 30 days of differentiation, the stem cell-derived PreMel were defined as CD105neg CD73low according to immunophenotypic changes in comparison with parental stem cell markers. In addition, expression of microphthalmia-associated transcription factor (MITF), active tyrosinase (TYR), and the terminal differentiation-involved premelanosome protein (PMEL) were detected. Furthermore, PreMel had the potential to synthesize melanin and package it into melanosomes both in vitro and in vivo in NSG mice skin. Conclusions This study proposes a rapid and scalable protocol for the generation of proliferative melanocyte precursors (PreMel) from ADSC. These PreMel display the essential functional characteristics of bona fide HEM, opening a new path for an autologous cellular therapy for vitiligo patients. Electronic supplementary material The online version of this article (10.1186/s13287-019-1364-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Gabriela Zavala
- Consorcio Regenero, La Plaza 2501, Las Condes, Santiago, Chile.,Biomedical Research Center (CIB), Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile
| | - Carolina Sandoval
- Biomedical Research Center (CIB), Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile
| | - Daniel Meza
- Consorcio Regenero, La Plaza 2501, Las Condes, Santiago, Chile.,Biomedical Research Center (CIB), Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile
| | - Rafael Contreras
- Cells for Cells, La Plaza 2501, Las Condes, Santiago, Chile.,Biomedical Research Center (CIB), Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile
| | - Walter Gubelin
- Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile
| | - Maroun Khoury
- Consorcio Regenero, La Plaza 2501, Las Condes, Santiago, Chile. .,Laboratory of Nano-Regenerative Medicine, Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile. .,Cells for Cells, La Plaza 2501, Las Condes, Santiago, Chile. .,Biomedical Research Center (CIB), Faculty of Medicine, Universidad de los Andes, Monseñor Álvaro del Portillo 12455, Las Condes, Santiago, Chile.
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16
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Abstract
Among the various genes that can be rearranged in soft tissue neoplasms associated with nonrandom chromosomal translocations, EWSR1 is the most frequent one to partner with other genes to generate recurrent fusion genes. This leads to a spectrum of clinically and pathologically diverse mesenchymal and nonmesenchymal neoplasms, variably manifesting as small round cell, spindle cell, clear cell or adipocytic tumors, or tumors with distinctive myxoid stroma. This review summarizes the growing list of mesenchymal neoplasms that are associated with EWSR1 gene rearrangements.
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Affiliation(s)
- Khin Thway
- Sarcoma Unit, Royal Marsden Hospital, The Royal Marsden NHS Foundation Trust, 203 Fulham Road, London SW3 6JJ, UK.
| | - Cyril Fisher
- Department of Musculoskeletal Pathology, Royal Orthopaedic Hospital NHS Foundation Trust, Robert Aitken Institute for Clinical Research, University of Birmingham, Birmingham B15 2TT, UK
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17
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Michael HT, Graff-Cherry C, Chin S, Rauck C, Habtemichael AD, Bunda P, Smith T, Campos MM, Bharti K, Arnheiter H, Merlino G, Day CP. Partial Rescue of Ocular Pigment Cells and Structure by Inducible Ectopic Expression of Mitf-M in MITF-Deficient Mice. Invest Ophthalmol Vis Sci 2019; 59:6067-6073. [PMID: 30590377 PMCID: PMC6314104 DOI: 10.1167/iovs.18-25186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Purpose Complete deficiency of microphthalmia transcription factor (MITF) in Mitfmi-vga9/mi-vga9 mice is associated with microphthalmia, retinal dysplasia, and albinism. We investigated the ability of dopachrome tautomerase (DCT) promoter-mediated inducible ectopic expression of Mitf-M to rescue these phenotypic abnormalities. Methods A new mouse line was created with doxycycline-inducible ectopic Mitf-M expression on an Mitf-deficient Mitfmi-vga9 background (DMV mouse). Adult DMV mice were phenotypically characterized and tissues were collected for histology, immunohistochemistry, and evaluation of Mitf, pigmentary genes, and retinal pigment epithelium (RPE) gene expression. Results Ectopic Mitf-M expression was specifically induced in the eyes, but was not detected in the skin of DMV mice. Inducible expression of Mitf-M partially rescued the microphthalmia, RPE structure, and pigmentation as well as a subset of the choroidal and iris melanocytes but not cutaneous melanocytes. RPE function and vision were not restored in the DMV mice. Conclusions Ectopic expression of Mitf-M during development of Mitf-deficient mice is capable of partially rescuing ocular and retinal structures and uveal melanocytes. These findings provide novel information about the roles of Mitf isoforms in the development of mouse eyes.
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Affiliation(s)
- Helen T Michael
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Cari Graff-Cherry
- Laboratory Animal Science Program, National Frederick Laboratory for Cancer Research, National Insitutes of Health, Frederick, Maryland, United States
| | - Sung Chin
- Laboratory Animal Science Program, National Frederick Laboratory for Cancer Research, National Insitutes of Health, Frederick, Maryland, United States
| | - Corinne Rauck
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Amelework D Habtemichael
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Patricia Bunda
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Tunde Smith
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Maria M Campos
- Histopathology Core Facility, National Eye Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Kapil Bharti
- Unit on Ocular and Stem Cell Translational Research, National Eye Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Heinz Arnheiter
- Scientist Emeritus, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, United States
| | - Glenn Merlino
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
| | - Chi-Ping Day
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Insitutes of Health, Bethesda, Maryland, United States
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18
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Fukuzawa T. A wide variety of Mitf transcript variants are expressed in the Xenopus laevis periodic albino mutant. Genes Cells 2018; 23:638-648. [PMID: 29920861 DOI: 10.1111/gtc.12606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 05/10/2018] [Accepted: 05/18/2018] [Indexed: 11/29/2022]
Abstract
The periodic albino mutant of Xenopus laevis has been used to study the development of pigment cells because both the retinal pigment epithelium (RPE) and melanophores are affected. In this mutant, "white pigment cells" containing both melanophore-specific and iridophore-specific pigment organelles appear. The present experiments were designed to investigate the structural organization and expression of microphthalmia-associated transcription factor (Mitf) in the mutant since Mitf is known to regulate the development of melanocytes and RPE. The exon structures of X. laevis mitf genes (mitf.L and mitf.S) were defined using newly obtained Mitf transcripts and X. laevis genomic data. Compared to mouse mitf, exons 3 and 6a were absent in X. laevis mitf. The four exons between exons 4 and 6b in X. laevis mitf were named 5α, 5β, 5γ, and 5δ. Exons 5α and 5δ were specific to X. laevis mitf, whereas the continuous exons 5β/γ were identical to exon 5 of mouse mitf. A wide variety of A-Mitf and M-Mitf transcript variants lacking one or more exons were found in X. laevis; however, different types of Mitf transcripts were expressed in the mutant. In addition, white pigment cells and melanophores expressed both the mitf and dopachrome tautomerase (dct) genes.
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19
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Chen T, Zhao B, Liu Y, Wang R, Yang Y, Yang L, Dong C. MITF-M regulates melanogenesis in mouse melanocytes. J Dermatol Sci 2018; 90:253-262. [PMID: 29496358 DOI: 10.1016/j.jdermsci.2018.02.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 02/06/2018] [Accepted: 02/14/2018] [Indexed: 11/17/2022]
Abstract
BACKGROUND Although the impact of the microphthalamia-associated transcription factor (Mitf) signaling pathway on melanocytes progression has been extensively studied, the specific molecular mechanisms behind MITF-M-enhanced melanin production in melanocytes still need to be clarified. METHODS In this study, we analyzed the levels of Mitf-M in skin tissues of different coat mice in order to further reveal the relationship between Mitf-M and skin pigmentation. To address the function of Mitf-M on melanogenesis, we have used an overexpression system and combined morphological and biochemical methods to investigate its localization in different coat color mice and pigmentation-related genes' expression in mouse melanocytes. RESULTS The qRT-PCR assay and Western blotting analysis revealed that Mitf-M mRNA and protein were synthesized in all tested mice skin samples, with the highest expression level in brown skin, a moderate expression level in grey skin and the lowest expression level in black skin. Simultaneously, immunofluorescence staining revealed that MITF-M was mainly expressed in the hair follicle matrix and inner and outer root sheath in the skin tissues with different coat colors. Furthermore, overexpression of MITF-M led to increased melanin content and variable pigmentation-related gene expression. CONCLUSION These results directly demonstrate that MITF-M not only influences melanogenesis, but also determines the progression of melanosomal protein in mouse melanocytes.
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Affiliation(s)
- Tianzhi Chen
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Bingling Zhao
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China
| | - Yu Liu
- College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
| | - Ruiwei Wang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China
| | - Yujing Yang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China
| | - Linpei Yang
- Shenzhou Vocational and Technical Education Center, Shenzhou 053800, China
| | - Changsheng Dong
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China.
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20
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Ohba K, Takeda K, Furuse T, Suzuki T, Wakana S, Suzuki T, Yamamoto H, Shibahara S. Microphthalmia-associated transcription factor ensures the elongation of axons and dendrites in the mouse frontal cortex. Genes Cells 2016; 21:1365-1379. [PMID: 27859996 DOI: 10.1111/gtc.12450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 10/06/2016] [Indexed: 11/29/2022]
Abstract
Long interspersed element-1 (LINE-1) is a mammalian transposable element, and its genomic insertion could cause neurological disorders in humans. Incidentally, LINE-1 is present in intron 3 of the microphthalmia-associated transcription factor (Mitf) gene of the black-eyed white mouse (Mitfmi-bw allele). Mice homozygous for the Mitfmi-bw allele show the white coat color with black eye and deafness. Here, we explored the functional consequences of the LINE-1 insertion in the Mitf gene using homozygous Mitfmi-bw mice on the C3H background (C3H-bw mice) or on the C57BL/6 background (bw mice). The open-field test showed that C3H-bw mice moved more irregularly in an unfamiliar environment during the 20-min period, compared to wild-type mice, suggesting the altered emotionality. Moreover, C3H-bw mice showed the lower serum creatinine levels, which may reflect the creatine deficiency. In fact, morphologically abnormal neurons and astrocytes were detected in the frontal cortex of bw mice. The immunohistochemical analysis of bw mouse tissues showed the lower intensity for expression of guanidinoacetate methyltransferase, a key enzyme in creatine synthesis, in neurons of the frontal cortex and in glomeruli and renal tubules. Thus, Mitf may ensure the elongation of axons and dendrites by maintaining creatine synthesis in the frontal cortex.
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Affiliation(s)
- Koji Ohba
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi, 980-8575, Japan
| | - Kazuhisa Takeda
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi, 980-8575, Japan
| | - Tamio Furuse
- Technology and Development Team for Mouse Phenotype Analysis, Japan Mouse Clinic, RIKEN BRC, Tsukuba, Ibaraki, 305-0074, Japan
| | - Tomohiro Suzuki
- Technology and Development Team for Mouse Phenotype Analysis, Japan Mouse Clinic, RIKEN BRC, Tsukuba, Ibaraki, 305-0074, Japan
| | - Shigeharu Wakana
- Technology and Development Team for Mouse Phenotype Analysis, Japan Mouse Clinic, RIKEN BRC, Tsukuba, Ibaraki, 305-0074, Japan
| | - Takashi Suzuki
- Department of Pathology and Histotechnology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, 980-8575, Japan
| | - Hiroaki Yamamoto
- Faculty of Bioscience, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, 526-0829, Japan
| | - Shigeki Shibahara
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi, 980-8575, Japan.,Faculty of Sports Science, Sendai University, Shibata-Gun, Miyagi, 989-1693, Japan
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21
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Chen L, Guo W, Ren L, Yang M, Zhao Y, Guo Z, Yi H, Li M, Hu Y, Long X, Sun B, Li J, Zhai S, Zhang T, Tian S, Meng Q, Yu N, Zhu D, Tang G, Tang Q, Ren L, Liu K, Zhang S, Che T, Yu Z, Wu N, Jing L, Zhang R, Cong T, Chen S, Zhao Y, Zhang Y, Bai X, Guo Y, Zhao L, Zhang F, Zhao H, Zhang L, Hou Z, Zhao J, Li J, Zhang L, Sun W, Zou X, Wang T, Ge L, Liu Z, Hu X, Wang J, Yang S, Li N. A de novo silencer causes elimination of MITF-M expression and profound hearing loss in pigs. BMC Biol 2016; 14:52. [PMID: 27349893 PMCID: PMC4922063 DOI: 10.1186/s12915-016-0273-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 06/10/2016] [Indexed: 12/18/2022] Open
Abstract
Background Genesis of novel gene regulatory modules is largely responsible for morphological and functional evolution. De novo generation of novel cis-regulatory elements (CREs) is much rarer than genomic events that alter existing CREs such as transposition, promoter switching or co-option. Only one case of de novo generation has been reported to date, in fish and without involvement of phenotype alteration. Yet, this event likely occurs in other animals and helps drive genetic/phenotypic variation. Results Using a porcine model of spontaneous hearing loss not previously characterized we performed gene mapping and mutation screening to determine the genetic foundation of the phenotype. We identified a mutation in the non-regulatory region of the melanocyte-specific promoter of microphthalmia-associated transcription factor (MITF) gene that generated a novel silencer. The consequent elimination of expression of the MITF-M isoform led to early degeneration of the intermediate cells of the cochlear stria vascularis and profound hearing loss, as well as depigmentation, all of which resemble the typical phenotype of Waardenburg syndrome in humans. The mutation exclusively affected MITF-M and no other isoforms. The essential function of Mitf-m in hearing development was further validated using a knock-out mouse model. Conclusions Elimination of the MITF-M isoform alone is sufficient to cause deafness and depigmentation. To our knowledge, this study provides the first evidence of a de novo CRE in mammals that produces a systemic functional effect. Electronic supplementary material The online version of this article (doi:10.1186/s12915-016-0273-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lei Chen
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China.,Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Weiwei Guo
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Lili Ren
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Mingyao Yang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Yaofeng Zhao
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Zongyi Guo
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Haijin Yi
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Mingzhou Li
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Yiqing Hu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Xi Long
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Boyuan Sun
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Jinxiu Li
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Suoqiang Zhai
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Tinghuan Zhang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Shilin Tian
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Qingyong Meng
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Ning Yu
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Dan Zhu
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Guoqing Tang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Qianzi Tang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Liming Ren
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Ke Liu
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Shihua Zhang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Tiandong Che
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
| | - Zhengquan Yu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Nan Wu
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Lan Jing
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Ran Zhang
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Tao Cong
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Siqing Chen
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Yiqiang Zhao
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Yue Zhang
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Xiaoqing Bai
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Ying Guo
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Lidong Zhao
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Fengming Zhang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Hui Zhao
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Liang Zhang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Zhaohui Hou
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Jiugang Zhao
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Jianan Li
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Lijuan Zhang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Wei Sun
- Department of Communicative Disorders and Sciences, Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, New York, USA
| | - Xiangang Zou
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Tao Wang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Liangpeng Ge
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Zuohua Liu
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China
| | - Xiaoxiang Hu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China
| | - Jingyong Wang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, 402460, China.
| | - Shiming Yang
- Department of Otolaryngology, Head & Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China.
| | - Ning Li
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, 100193, China.
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Takeda K, Hozumi H, Ohba K, Yamamoto H, Shibahara S. Regional Fluctuation in the Functional Consequence of LINE-1 Insertion in the Mitf Gene: The Black Spotting Phenotype Arisen from the Mitfmi-bw Mouse Lacking Melanocytes. PLoS One 2016; 11:e0150228. [PMID: 26930598 PMCID: PMC4773177 DOI: 10.1371/journal.pone.0150228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 02/10/2016] [Indexed: 11/19/2022] Open
Abstract
Microphthalmia-associated transcription factor (Mitf) is a key regulator for differentiation of melanoblasts, precursors to melanocytes. The mouse homozygous for the black-eyed white (Mitfmi-bw) allele is characterized by the white-coat color and deafness with black eyes due to the lack of melanocytes. The Mitfmi-bw allele carries LINE-1, a retrotransposable element, which results in the Mitf deficiency. Here, we have established the black spotting mouse that was spontaneously arisen from the homozygous Mitfmi-bw mouse lacking melanocytes. The black spotting mouse shows multiple black patches on the white coat, with age-related graying. Importantly, each black patch also contains hair follicles lacking melanocytes, whereas the white-coat area completely lacks melanocytes. RT-PCR analyses of the pigmented patches confirmed that the LINE-1 insertion is retained in the Mitf gene of the black spotting mouse, thereby excluding the possibility of the somatic reversion of the Mitfmi-bw allele. The immunohistochemical analysis revealed that the staining intensity for beta-catenin was noticeably lower in hair follicles lacking melanocytes of the homozygous Mitfmi-bw mouse and the black spotting mouse, compared to the control mouse. In contrast, the staining intensity for beta-catenin and cyclin D1 was higher in keratinocytes of the black spotting mouse, compared to keratinocytes of the control mouse and the Mitfmi-bw mouse. Moreover, the keratinocyte layer appears thicker in the Mitfmi-bw mouse, with the overexpression of Ki-67, a marker for cell proliferation. We also show that the presumptive black spots are formed by embryonic day 15.5. Thus, the black spotting mouse provides the unique model to explore the molecular basis for the survival and death of developing melanoblasts and melanocyte stem cells in the epidermis. These results indicate that follicular melanocytes are responsible for maintaining the epidermal homeostasis; namely, the present study has provided evidence for the link between melanocyte development and the epidermal microenvironment.
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Affiliation(s)
- Kazuhisa Takeda
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi 980–8575, Japan
| | - Hiroki Hozumi
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi 980–8575, Japan
| | - Koji Ohba
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi 980–8575, Japan
| | - Hiroaki Yamamoto
- Faculty of Bioscience, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga 526–0829, Japan
| | - Shigeki Shibahara
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi 980–8575, Japan
- * E-mail:
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23
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Induction of MITF expression in human cholangiocarcinoma cells and hepatocellular carcinoma cells by cyclopamine, an inhibitor of the Hedgehog signaling. Biochem Biophys Res Commun 2016; 470:144-149. [PMID: 26773496 DOI: 10.1016/j.bbrc.2016.01.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 01/04/2016] [Indexed: 12/23/2022]
Abstract
Microphthalmia-associated transcription factor (MITF) is a key regulator of differentiation of melanocytes and retinal pigment epithelial cells, but it also has functions in non-pigment cells. MITF consists of multiple isoforms, including widely expressed MITF-A and MITF-H. In the present study, we explored the potential role played by the Hedgehog signaling on MITF expression in two common types of primary liver cancer, using human cholangiocarcinoma cell lines, the KKU-100 and HuCCT1, along with the HepG2 human hepatocellular carcinoma cell line. Importantly, cholangiocarcinoma is characterized by the activated Hedgehog signaling. Here we show that MITF-A mRNA is predominantly expressed in all three human liver cancer cell lines examined. Moreover, cyclopamine, an inhibitor of the Hedgehog signalling, increased the expression levels of MITF proteins in HuCCT1 and HepG2 cells, but not in KKU-100 cells, suggesting that MITF expression may be down-regulated in some liver cancer cases.
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24
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Wang X, Liu Y, Chen H, Mei L, He C, Jiang L, Niu Z, Sun J, Luo H, Li J, Feng Y. LEF-1 Regulates Tyrosinase Gene Transcription In Vitro. PLoS One 2015; 10:e0143142. [PMID: 26580798 PMCID: PMC4651308 DOI: 10.1371/journal.pone.0143142] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 10/30/2015] [Indexed: 12/31/2022] Open
Abstract
TYR, DCT and MITF are three important genes involved in maintaining the mature phenotype and producing melanin; they therefore participate in neural crest cell development into melanocytes. Previous studies have revealed that the Wnt signaling factor lymphoid enhancer-binding factor (LEF-1) can enhance DCT and MITF gene expression. However, whether LEF-1 also affects TYR gene expression remains unclear. In the present study, we found that LEF-1 regulated TYR transcription in vitro. LEF-1 overexpression increased TYR gene promoter activity, whereas LEF-1 knockdown by RNA interference significantly decreased TYR expression. Moreover, the core GTTTGAT sequence (-56 to -50) within the TYR promoter is essential for the effect of LEF-1 on TYR expression, and chromatin immunoprecipitation (ChIP) assay indicated that endogenous LEF-1 interacts with the TYR promoter. In addition, we observed a synergistic transactivation of the TYR promoter by LEF-1 and MITF. These data suggest that Wnt signaling plays an important role in regulating melanocyte development and differentiation.
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Affiliation(s)
- Xueping Wang
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Yalan Liu
- Province Key Laboratory of Otolaryngology Critical Disease, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Hongsheng Chen
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- Province Key Laboratory of Otolaryngology Critical Disease, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Lingyun Mei
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- Province Key Laboratory of Otolaryngology Critical Disease, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Chufeng He
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- Province Key Laboratory of Otolaryngology Critical Disease, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Lu Jiang
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- Province Key Laboratory of Otolaryngology Critical Disease, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Zhijie Niu
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
| | - Jie Sun
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- Department of Otolaryngology, 1st Affiliated Hospital, Xinjiang Medical University, Urumqi, People’s Republic of China
| | - Hunjin Luo
- State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, People’s Republic of China
| | - Jiada Li
- State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, People’s Republic of China
- * E-mail: (JDL); (YF)
| | - Yong Feng
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- Province Key Laboratory of Otolaryngology Critical Disease, Xiangya Hospital, Central South University, Changsha, Hunan, People’s Republic of China
- State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, People’s Republic of China
- * E-mail: (JDL); (YF)
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25
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Ohba K, Takeda K, Yamamoto H, Shibahara S. Microphthalmia-associated transcription factor is expressed in projection neurons of the mouse olfactory bulb. Genes Cells 2015; 20:1088-102. [DOI: 10.1111/gtc.12312] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 10/01/2015] [Indexed: 12/11/2022]
Affiliation(s)
- Koji Ohba
- Department of Molecular Biology and Applied Physiology; Tohoku University School of Medicine; 2-1 Seiryo-machi Aoba-ku Sendai Miyagi 980-8575 Japan
| | - Kazuhisa Takeda
- Department of Molecular Biology and Applied Physiology; Tohoku University School of Medicine; 2-1 Seiryo-machi Aoba-ku Sendai Miyagi 980-8575 Japan
| | - Hiroaki Yamamoto
- Faculty of Bioscience; Nagahama Institute of Bio-Science and Technology; 1266 Tamura-cho Nagahama Shiga 526-0829 Japan
| | - Shigeki Shibahara
- Department of Molecular Biology and Applied Physiology; Tohoku University School of Medicine; 2-1 Seiryo-machi Aoba-ku Sendai Miyagi 980-8575 Japan
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26
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Stem cell based therapies for age-related macular degeneration: The promises and the challenges. Prog Retin Eye Res 2015; 48:1-39. [DOI: 10.1016/j.preteyeres.2015.06.004] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 06/05/2015] [Accepted: 06/11/2015] [Indexed: 12/21/2022]
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27
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Hartman ML, Czyz M. MITF in melanoma: mechanisms behind its expression and activity. Cell Mol Life Sci 2014; 72:1249-60. [PMID: 25433395 PMCID: PMC4363485 DOI: 10.1007/s00018-014-1791-0] [Citation(s) in RCA: 198] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 11/10/2014] [Accepted: 11/20/2014] [Indexed: 02/06/2023]
Abstract
MITF (microphthalmia-associated transcription factor) represents a melanocytic lineage-specific transcription factor whose role is profoundly extended in malignant melanoma. Over the last few years, the function of MITF has been tightly connected to plasticity of melanoma cells. MITF participates in executing diverse melanoma phenotypes defined by distinct gene expression profiles. Mutation-dependent alterations in MITF expression and activity have been found in a relatively small subset of melanomas. MITF activity is rather modulated by its upstream activators and suppressors operating on transcriptional, post-transcriptional and post-translational levels. These regulatory mechanisms also include epigenetic and microenvironmental signals. Several transcription factors and signaling pathways involved in the regulation of MITF expression and/or activity such as the Wnt/β-catenin pathway are broadly utilized by various types of tumors, whereas others, e.g., BRAFV600E/ERK1/2 are more specific for melanoma. Furthermore, the MITF activity can be affected by the availability of transcriptional co-partners that are often redirected by MITF from their own canonical signaling pathways. In this review, we discuss the complexity of a multilevel regulation of MITF expression and activity that underlies distinct context-related phenotypes of melanoma and might explain diverse responses of melanoma patients to currently used therapeutics.
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Affiliation(s)
- Mariusz L Hartman
- Department of Molecular Biology of Cancer, Medical University of Lodz, 6/8 Mazowiecka Street, 92-215, Lodz, Poland
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28
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Microphthalmia-associated transcription factor as the molecular target of cadmium toxicity in human melanocytes. Biochem Biophys Res Commun 2014; 454:594-9. [DOI: 10.1016/j.bbrc.2014.10.141] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Accepted: 10/28/2014] [Indexed: 12/26/2022]
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29
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Mirabzadeh-Ardakani A, Griebel P, Schmutz SM. Identification of a new non-coding exon and haplotype variability in the cattle DEFB103 gene. Gene 2014; 551:183-8. [DOI: 10.1016/j.gene.2014.08.055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/15/2014] [Accepted: 08/26/2014] [Indexed: 12/13/2022]
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30
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Lu SY, Li M, Lin YL. Mitf regulates osteoclastogenesis by modulating NFATc1 activity. Exp Cell Res 2014; 328:32-43. [PMID: 25152440 DOI: 10.1016/j.yexcr.2014.08.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 07/25/2014] [Accepted: 08/13/2014] [Indexed: 10/24/2022]
Abstract
Transcription factors Mitf and NFATc1 share many downstream targets that are critical for osteoclastogenesis. Since RANKL signals induce/activate both NFATc1 and Mitf isoform-E (Mitf-E), a tissue-restricted Mitf isoform in osteoclasts, it is plausible that the two factors work together to promote osteoclastogenesis. Although Mitf was shown to function upstream of NFATc1 previously, this study showed that expression of Mitf had little effects on NFATc1 and NFATc1 was critical for the induction of Mitf-E. In Mitf(mi/mi) mice, the semi-dominant mutation in Mitf gene leads to arrest of osteoclastogenesis in the early stages. However, when stimulated by RANKL, the Mitf(mi/mi) preosteoclasts responded with a significant induction of NFATc1, despite that the cells cannot differentiate into functional osteoclasts. In the absence of RANKL stimulation, very high levels of NFATc1 are required to drive osteoclast development. Our data indicate that Mitf functions downstream of NFATc1 in the RANKL pathway, and it plays an important role in amplifying NFATc1-dependent osteoclastogenic signals, which contributes to the significant synergy between the two factors during osteoclastogenesis. We propose that Mitf-E functions as a tissue-specific modulator for events downstream of NFATc1 activation during osteoclastogenesis.
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Affiliation(s)
- Ssu-Yi Lu
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA, USA.
| | - Mengtao Li
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA, USA; CHS 23-087, 10833 Le Conte Ave., Los Angeles, CA 90095, USA.
| | - Yi-Ling Lin
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA, USA; Gene Regulation Program, Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA.
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31
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Capowski EE, Simonett JM, Clark EM, Wright LS, Howden SE, Wallace KA, Petelinsek AM, Pinilla I, Phillips MJ, Meyer JS, Schneider BL, Thomson JA, Gamm DM. Loss of MITF expression during human embryonic stem cell differentiation disrupts retinal pigment epithelium development and optic vesicle cell proliferation. Hum Mol Genet 2014; 23:6332-44. [PMID: 25008112 DOI: 10.1093/hmg/ddu351] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Microphthalmia-associated transcription factor (MITF) is a master regulator of pigmented cell survival and differentiation with direct transcriptional links to cell cycle, apoptosis and pigmentation. In mouse, Mitf is expressed early and uniformly in optic vesicle (OV) cells as they evaginate from the developing neural tube, and null Mitf mutations result in microphthalmia and pigmentation defects. However, homozygous mutations in MITF have not been identified in humans; therefore, little is known about its role in human retinogenesis. We used a human embryonic stem cell (hESC) model that recapitulates numerous aspects of retinal development, including OV specification and formation of retinal pigment epithelium (RPE) and neural retina progenitor cells (NRPCs), to investigate the earliest roles of MITF. During hESC differentiation toward a retinal lineage, a subset of MITF isoforms was expressed in a sequence and tissue distribution similar to that observed in mice. In addition, we found that promoters for the MITF-A, -D and -H isoforms were directly targeted by Visual Systems Homeobox 2 (VSX2), a transcription factor involved in patterning the OV toward a NRPC fate. We then manipulated MITF RNA and protein levels at early developmental stages and observed decreased expression of eye field transcription factors, reduced early OV cell proliferation and disrupted RPE maturation. This work provides a foundation for investigating MITF and other highly complex, multi-purposed transcription factors in a dynamic human developmental model system.
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Affiliation(s)
| | | | | | | | - Sara E Howden
- Morgridge Institute for Research, Madison, WI 53715, USA
| | | | | | - Isabel Pinilla
- Department of Ophthalmology, University Hospital Lozano Blesa, Zaragoza 50009, Spain, Aragon Institute of Health Sciences, Zaragoza 50009, Spain
| | | | - Jason S Meyer
- Department of Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Bernard L Schneider
- Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - James A Thomson
- Morgridge Institute for Research, Madison, WI 53715, USA, Department of Cell and Regenerative Biology, University of Wisconsin-Madison, Madison, WI 53715, USA and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, CA 93106, USA
| | - David M Gamm
- Waisman Center, McPherson Eye Research Institute and Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53705, USA,
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32
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Asai K, Funaba M, Murakami M. Enhancement of RANKL-induced MITF-E expression and osteoclastogenesis by TGF-β. Cell Biochem Funct 2014; 32:401-9. [PMID: 24519885 DOI: 10.1002/cbf.3028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 01/14/2014] [Accepted: 01/15/2014] [Indexed: 01/07/2023]
Abstract
Microphthalmia-associated transcription factor (MITF) is a transcription factor that is expressed in limited types of cells, including osteoclasts, but the expression and role of MITF during osteoclastogenesis have not been fully elucidated. The expression of the MITF-E isoform but not that of the MITF-A isoform was induced in response to differentiation stimulation towards osteoclasts by receptor activator of NF-κB ligand (RANKL) in both RAW264.7 cells and primary bone marrow cells. The RANKL-induced formation of tartrate-resistant acid phosphatase (TRAP)-positive multinucleated cells was inhibited in RAW264.7 cells expressing siRNA for MITF-E. Transforming growth factor-β (TGF-β) enhanced RANKL-induced MITF-E expression and -TRAP positive multinucleated cell formation. In particular, TGF-β potentiated the formation of larger osteoclasts. The expression levels of NFATc1, TRAP and CtsK, genes related to osteoclast development and activity, were concurrently enhanced by TGF-β in the presence of RANKL. Furthermore, the expression of dendritic cell-specific transmembrane protein (DC-STAMP), Itgav, Itga2, Itga5, Itgb1, Itgb3 and Itgb5, genes related to cell adhesion and fusion, were up-regulated by co-treatment with TGF-β. In particular, the regulatory expression of Itgav and Itgb5 in response to RANKL with or without TGF-β resembled that of MITF-E. Because MITF is involved in cell fusion in some cell systems, these results imply a role for MITF-E as an enhancer of osteoclastogenesis and that RANKL-induced levels of both MITF-E mRNA and of MITF-dependent gene expression are enhanced by treatment with TGF-β.
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Affiliation(s)
- Kumiko Asai
- Laboratory of Molecular Biology, Azabu University School of Veterinary Medicine, Sagamihara, Japan
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33
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Takeda K, Hozumi H, Nakai K, Yoshizawa M, Satoh H, Yamamoto H, Shibahara S. Insertion of long interspersed element-1 in the Mitf gene is associated with altered neurobehavior of the black-eyed white Mitf(mi-bw) mouse. Genes Cells 2013; 19:126-40. [PMID: 24304702 DOI: 10.1111/gtc.12117] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Accepted: 10/21/2013] [Indexed: 11/30/2022]
Abstract
Microphthalmia-associated transcription factor (Mitf) is required for the differentiation of melanoblasts of the neural crest origin. The mouse homozygous for the black-eyed white (Mitf(mi-bw) ) allele is characterized by white-coat color and deafness with black eye, due to the loss of melanoblasts during embryonic development. The Mitf(mi-bw) allele carries an insertion of long interspersed element-1 (L1) in intron 3 of the Mitf gene, which may cause the deficiency of melanocyte-specific Mitf-M. Here, we show that the L1 insertion results in the generation of alternatively spliced Mitf-M mRNA species, such as Mitf-M mRNA lacking exon 3, exon 4 or both exons 3 and 4, each of which encodes Mitf-M protein with an internal deletion. Transient expression assays showed the loss of or reduction in function of each aberrant Mitf-M protein and the dominant negative effect of Mitf-M lacking exon 4 that encodes an activation domain. Thus, the L1 insertion may decrease the expression level of functional Mitf-M. Importantly, Mitf-M mRNA is expressed in the wild-type mouse brain, with the highest expression level in the hypothalamus. Likewise, aberrant Mitf-M mRNAs are expressed in the bw mouse brain. The bw mice show the altered neurobehavior under a stressful environment, suggesting the role of Mitf-M in sensory perception.
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Affiliation(s)
- Kazuhisa Takeda
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi, 980-8575, Japan
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Fisher C. The diversity of soft tissue tumours withEWSR1gene rearrangements: a review. Histopathology 2013; 64:134-50. [DOI: 10.1111/his.12269] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Accepted: 08/27/2013] [Indexed: 12/14/2022]
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Fotaki V, Smith R, Pratt T, Price DJ. Foxg1 is required to limit the formation of ciliary margin tissue and Wnt/β-catenin signalling in the developing nasal retina of the mouse. Dev Biol 2013; 380:299-313. [PMID: 23624311 PMCID: PMC3722486 DOI: 10.1016/j.ydbio.2013.04.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 04/15/2013] [Accepted: 04/16/2013] [Indexed: 12/23/2022]
Abstract
The ciliary margin (CM) develops in the peripheral retina and gives rise to the iris and the ciliary body. The Wnt/β-catenin signalling pathway has been implicated in ciliary margin development. Here, we tested the hypothesis that in the developing mouse retina Foxg1 is responsible for suppressing the Wnt/β-catenin pathway and restricting CM development. We showed that there is excess CM tissue in Foxg1−/− null embryos and this expansion is more pronounced in the nasal retina where Foxg1 normally shows its highest expression levels. Results on expression of a reporter allele for Wnt/β-catenin signalling and of Lef1, a target of Wnt/β-catenin signalling, displayed significant upregulation of this pathway in Foxg1−/− nulls at embryonic days 12.5 and 14.5. Interestingly, this upregulation was observed specifically in the nasal retina, where normally very few Wnt-responsive cells are observed. These results indicate a suppressive role of Foxg1 on this signalling pathway. Our results reveal a new role of Foxg1 in limiting CM development in the nasal peripheral retina and add a new molecular player in the developmental network involved in CM specification. Foxg1 is expressed in a nasal-high to temporal-low gradient in developing retina. Ciliary margin expansion is observed nasally in the Foxg1−/− mutant retina. Wnt/β-catenin signalling is upregulated in the Foxg1−/− peripheral retina nasally. A new role of Foxg1 in controlling ciliary margin development is proposed.
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Affiliation(s)
- Vassiliki Fotaki
- University of Edinburgh, Centre for Integrative Physiology, Hugh Robson Building, George Square, Edinburgh EH8 9XD, UK.
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Ohta S, Imaizumi Y, Akamatsu W, Okano H, Kawakami Y. Generation of human melanocytes from induced pluripotent stem cells. Methods Mol Biol 2013; 989:193-215. [PMID: 23483397 DOI: 10.1007/978-1-62703-330-5_16] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The discovery of human induced pluripotent stem cells (iPSCs) has provided a model system for studying early events during human development. Developmentally melanocytes originate from migratory neural crest cells that emerge from the neural plate during embryogenesis after a complex process of differentiation, proliferation, and migration out of the neural tube along defined pathways. In the adult, human melanocytes are located in the basal layer of the epidermis, hair follicles, uvea, inner ear, and meninges. In the epidermis, melanocytes produce melanin pigment that gives color to the skin as well as providing protection from ultraviolet light damage. In addition, melanocytes transfer melanin pigment to hair matrix keratinocytes during each hair cycle to maintain hair pigmentation. Characterization of mouse melanocyte stem cells (MELSCs) is more complete than for humans. MELSCs are located in the bulge region of hair follicles, where hair follicle stem cells (HFSCs) also reside. Recently, it has been demonstrated that HFSCs provide a functional nice for MELSCs. According to current cancer stem cell theory, melanomas are considered to evolve from MELSCs, although the exact mechanism remains to be elucidated fully. In humans, importantly, the lack of more specific markers of MELSCs, current understanding of the molecular regulations of melanocyte development remains incomplete. Recently, the generation of melanocytes from iPSCs has lead to some clarification of human melanocyte development in vitro. Utilization of iPSC-derived melanocytes may prove invaluable in further study of human melanocytic development and novel therapies for patients suffering with pigmentation disorders and melanoma.
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Affiliation(s)
- Shigeki Ohta
- Division of Cellular Signaling, Institute for Advanced Medical Research, Keio University School of Medicine, Tokyo, Japan
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Ni C, Zhang D, Beyer LA, Halsey KE, Fukui H, Raphael Y, Dolan DF, Hornyak TJ. Hearing dysfunction in heterozygous Mitf(Mi-wh) /+ mice, a model for Waardenburg syndrome type 2 and Tietz syndrome. Pigment Cell Melanoma Res 2012; 26:78-87. [PMID: 23020089 DOI: 10.1111/pcmr.12030] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Accepted: 09/25/2012] [Indexed: 11/30/2022]
Abstract
The human deafness-pigmentation syndromes, Waardenburg syndrome (WS) type 2a, and Tietz syndrome are characterized by profound deafness but only partial cutaneous pigmentary abnormalities. Both syndromes are caused by mutations in MITF. To illuminate differences between cutaneous and otic melanocytes in these syndromes, their development and survival in heterozygous Microphthalmia-White (Mitf(Mi-wh) /+) mice were studied and hearing function of these mice characterized. Mitf(Mi-wh) /+ mice have a profound hearing deficit, characterized by elevated auditory brainstem response thresholds, reduced distortion product otoacoustic emissions, absent endocochlear potential, loss of outer hair cells, and stria vascularis abnormalities. Mitf(Mi-wh) /+ embryos have fewer melanoblasts during embryonic development than their wild-type littermates. Although cochlear melanocytes are present at birth, they disappear from the Mitf(Mi-wh) /+ cochlea between P1 and P7. These findings may provide insight into the mechanism of melanocyte and hearing loss in human deafness-pigmentation syndromes such as WS and Tietz syndrome and illustrate differences between otic and follicular melanocytes.
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Affiliation(s)
- Christina Ni
- Dermatology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
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Cimadamore F, Shah M, Amador-Arjona A, Navarro-Peran E, Chen C, Huang CT, Terskikh AV. SOX2 modulates levels of MITF in normal human melanocytes, and melanoma lines in vitro. Pigment Cell Melanoma Res 2012; 25:533-6. [PMID: 22571403 DOI: 10.1111/j.1755-148x.2012.01012.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
EWSR1-CREB1 and EWSR1-ATF1 are gene fusions of which one or both have now been consistently described in 5 histopathologically and behaviorally diverse neoplasms: angiomatoid fibrous histiocytoma, conventional clear cell sarcoma (of tendons and aponeuroses), clear cell sarcoma-like tumor of the gastrointestinal tract, hyalinizing clear cell carcinoma of the salivary gland, and primary pulmonary myxoid sarcoma. Some of the tumors in this group have been described only recently, and others have been the subject of recent genetic insights contributing to their characterization. These neoplasms are all rare; yet, the increasing frequency with which EWSR1-CREB1 and EWSR1-ATF1 fusions are being described in separate entities is noteworthy. The additional molecular mechanisms by which tumors with such variable morphologic, immunohistochemical, and clinical phenotypes are generated are yet to be understood. We review the clinicopathologic and molecular features of this group of neoplasms unified by the presence of EWSR1-CREB1 and EWSR1-ATF1 genetic fusions.
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Hozumi H, Takeda K, Yoshida-Amano Y, Takemoto Y, Kusumi R, Fukuzaki-Dohi U, Higashitani A, Yamamoto H, Shibahara S. Impaired development of melanoblasts in the black-eyed white Mitf(mi-bw) mouse, a model for auditory-pigmentary disorders. Genes Cells 2012; 17:494-508. [PMID: 22563733 DOI: 10.1111/j.1365-2443.2012.01603.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Microphthalmia-associated transcription factor (Mitf) is a regulator for differentiation of melanoblasts that are derived from the neural crest. The mouse homozygous for the black-eyed white (Mitf(mi-bw)) allele is characterized by the white coat color and deafness, with black eye that is associated with the lack of melanocytes in skin and inner ear. The Mitf(mi-bw) mutation is an insertion of the LINE1 retrotransposable element into intron 3 of the Mitf gene that causes the selective deficiency of the melanocyte-specific Mitf isoform, Mitf-M. Here, we show the expression of Mitf-M mRNA in the trunk region of the homozygous Mitf(mi-bw)(bw) mouse at embryonic days (E) 11.5 and E12.5, but Mitf-M mRNA is undetectable at E13.5. In addition, using bw mouse that carries the lacZ transgene under the control of a melanoblast-specific promoter, we show that the number of migrating melanoblasts in bw embryos was less than 10% of that in control embryos at E11.5 and E12.5, and melanoblasts disappear by E13.5. The loss of melanoblasts in bw embryos was probably caused by apoptosis. Finally, forced expression of Mitf-M in the cultured neural tube of bw embryos ensured the differentiation of melanoblasts. Therefore, the correct dose of Mitf-M is required for the normal development of melanoblasts.
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Affiliation(s)
- Hiroki Hozumi
- Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai, Miyagi 980-8575, Japan
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Shirley SH, Greene VR, Duncan LM, Torres Cabala CA, Grimm EA, Kusewitt DF. Slug expression during melanoma progression. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 180:2479-89. [PMID: 22503751 DOI: 10.1016/j.ajpath.2012.02.014] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 02/08/2012] [Accepted: 02/13/2012] [Indexed: 01/05/2023]
Abstract
Slug (Snai2), a member of the Snail family of zinc finger transcription factors, plays a role in the epithelial-to-mesenchymal transformation (EMT) that occurs during melanocyte emigration from the neural crest. A role for Slug in the EMT-like loss of cell adhesion and increased cell motility exhibited during melanoma progression has also been proposed. Our immunohistochemical studies of melanoma arrays, however, revealed that Slug expression was actually higher in nevi than in primary or metastatic melanomas. Moreover, Slug expression in melanomas was not associated with decreased expression of E-cadherin, the canonical Slug target in EMT. Comparisons of endogenous Slug and E-cadherin expression in cultured normal human melanocytes and melanoma cell lines supported our immunohistochemical findings. Expression of exogenous Slug in melanocytes and melanoma cells in vitro, however, suppressed E-cadherin expression, enhanced N-cadherin expression, and stimulated cell migration and invasion. Interestingly, both in tumors and cultured cell lines, there was a clear relationship between expression of Slug and MITF, a transcription factor known to regulate Slug expression during development. Taken together, our findings suggest that Slug expression during melanomagenesis is highest early in the process and that persistent Slug expression is not required for melanoma progression. The precise role of Slug in melanomagenesis remains to be elucidated and may be related to its interactions with other drivers of EMT, such as Snail.
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Affiliation(s)
- Stephanie H Shirley
- Department of Molecular Carcinogenesis, Science Park, University of Texas MD Anderson Cancer Center, Smithville, TX 78957, USA
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Microphthalmia-associated transcription factor is required for mature myotube formation. Biochim Biophys Acta Gen Subj 2011; 1820:76-83. [PMID: 22138449 DOI: 10.1016/j.bbagen.2011.11.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 10/29/2011] [Accepted: 11/10/2011] [Indexed: 01/21/2023]
Abstract
BACKGROUND The roles of microphthalmia-associated transcription factor (Mitf) in the skeletal muscle and during myogenesis are unclear. METHODS Expression of Mitf in mouse tissues and during myogenesis was evaluated. Effects of Mitf knockdown on myogenesis and gene expression related to myogenesis were subsequently explored. Furthermore, effects of p21, a cyclin-dependent kinase inhibitor, and integrin α9 (Itga9) were examined. RESULTS Mitf was highly expressed in the skeletal muscle; Mitf-A and -J were expressed. Mitf expression increased after differentiation stimulation in C2C12 myogenic cells. Down-regulation of Mitf expression by transfection of siRNA for common Mitf inhibited myotube formation, which was reproduced by Mitf-A knockdown. Morphometric analyses indicated that both multinucleated cell number and the proportion of myotubes with more than 6 nuclei were decreased in Mitf-knockdown cells, suggesting that Mitf is required for not only the formation of nascent myotubes but also their maturation. Searching for genes positively regulated by Mitf revealed p21 and Itga9; decreasing Mitf expression inhibited up-regulation of p21 expression after differentiation stimulation and blocked the induction of Itga9 expression in response to differentiation. Knockdown of p21 decreased the number of multinucleated cells, whereas Itga9 knockdown did not affect the myotube number. Both p21 knockdown and Itga9 knockdown decreased the proportion of myotubes with more than 6 nuclei. GENERAL SIGNIFICANCE Mitf positively regulates skeletal muscle formation; Mitf is significantly expressed during myogenesis, and is required for efficient myotube formation through expression of p21 and Itga9.
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Nakajima H, Fukazawa K, Wakabayashi Y, Wakamatsu K, Imokawa G. Withania somnifera extract attenuates stem cell factor-stimulated pigmentation in human epidermal equivalents through interruption of ERK phosphorylation within melanocytes. J Nat Med 2011; 66:435-46. [DOI: 10.1007/s11418-011-0604-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Accepted: 10/21/2011] [Indexed: 12/17/2022]
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Suppression by fucoidan of liver fibrogenesis via the TGF-β/Smad pathway in protecting against oxidative stress. Biosci Biotechnol Biochem 2011; 75:833-40. [PMID: 21597183 DOI: 10.1271/bbb.100599] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Fucoidan, a sulfated polysaccharide extracted from various types of brown seaweed, possesses a wide range of pharmacological properties. We investigated the protective effect of fucoidan on dimethylnitrosamine-induced liver fibrogenesis in rats and its mechanism. Liver fibrosis was induced by injecting DMN (10 mg/kg, 3 times per week, I.P.) for 4 weeks, and fucoidan was simultaneously administered (100 mg/kg, 3 times per week, P.O.). The anti-oxidative and anti-inflammatory effects of fucoidan were observed by relative mediators. Fucoidan improved liver fibrosis by inhibiting the expression of transforming growth factor beta 1 (TGF-β(1))/Smad3 and the tissue inhibitor of metalloproteinase 1 (TIMP-1), and increasing the expression of metalloproteinase-9 (MMP-9). Fucoidan also significantly decreased the accumulation of the extracellular matrix (ECM) and collagen. These results suggest that fucoidan had an anti-fibrotic effect, which was exerted by inhibiting the TGF-β/Smad pathway, as well as anti-oxidative and anti-inflammatory effects.
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Effect of the mutant microphthalmia-associated transcription factor found in Tietz syndrome on the in vitro development of mast cells. J Pediatr Hematol Oncol 2010; 32:442-7. [PMID: 20485200 DOI: 10.1097/mph.0b013e3181d9da5d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Mutations in microphthalmia-associated transcription factor (MITF) lead to Waardenburg syndrome type 2 (WS2), a dominantly inherited disorder involving hearing loss and pigment disturbances caused by a lack of melanocytes. On rare occasions, mutations in MITF lead to Tietz syndrome (TS), which is characterized by a severe WS2 phenotype. The MITF gene is the human homolog of the mouse microphthalmia (mi) gene in some families. Mi/mi mice show decreased numbers and an abnormal phenotype of mast cells (MC). In contrast, the number and phenotype of MC in WS2/TS patients who also have an alteration in their MITF gene are unclear. In this study, we identified a mutation in the MITF gene, delR217, which was equivalent to that found in mi/mi mice, in a case of TS. None of the MITF isoforms with the mutation were able to transactivate the tyrosinase gene promoter. In addition, mutant MITF-M showed dominant negative activity toward wild-type MITF-M, inhibiting its transactivation of the tyrosinase gene promoter. The patient's peripheral blood CD34 cells showed no differences with respect to total cell number or their expression levels of tryptase mRNA in a serum-deprived liquid culture system for 6 weeks when compared with normal control cells. These findings suggest that MITF does not play a critical role in MC development in humans.
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Lu SY, Wan HC, Li M, Lin YL. Subcellular localization of Mitf in monocytic cells. Histochem Cell Biol 2010; 133:651-8. [PMID: 20437053 PMCID: PMC2869019 DOI: 10.1007/s00418-010-0703-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2010] [Indexed: 10/27/2022]
Abstract
Microphthalmia-associated transcription factor (Mitf) is a transcription factor that plays an important role in regulating the development of several cell lineages. The subcellular localization of Mitf is dynamic and is associated with its transcription activity. In this study, we examined factors that affect its subcellular localization in cells derived from the monocytic lineage since Mitf is present abundantly in these cells. We identified a domain encoded by Mitf exon 1B1b to be important for Mitf to commute between the cytoplasm and the nucleus. Deletion of this domain disrupts the shuttling of Mitf to the cytoplasm and results in its retention in the nucleus. M-CSF and RANKL both induce nuclear translocation of Mitf. We showed that Mitf nuclear transport is greatly influenced by ratio of M-CSF/Mitf protein expression. In addition, cell attachment to a solid surface also is needed for the nuclear transport of Mitf.
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Affiliation(s)
- Ssu-Yi Lu
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA 90095, USA
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Abstract
Microphthalmia-associated transcription factor (Mitf) regulates the development and function of several cell lineages, including osteoclasts. In this report, we identified a novel mechanism by which RANKL regulates osteoclastogenesis via induction of Mitf isoform E (Mitf-E). Both Mitf-A and Mitf-E are abundantly present in osteoclasts. Unlike Mitf-A, which is ubiquitously expressed and is present in similar amounts in macrophages and osteoclasts, Mitf-E is almost nondetectable in macrophages, but its expression is significantly up-regulated during osteoclastogenesis. In addition to their different expression profiles, the two isoforms are drastically different in their abilities to support osteoclastogenesis, despite sharing all known functional domains. Unlike Mitf-A, small amounts of Mitf-E are present in nuclear lysates unless chromatin is digested/sheared during the extraction. Based on these data, we propose a model in which Mitf-E is induced during osteoclastogenesis and is closely associated with chromatin to facilitate its interaction with target promoters; therefore, Mitf-E has a stronger osteoclastogenic activity. Mitf-A is a weaker osteoclastogenic factor, but activated Mitf-A alone is not sufficient to fully support osteoclastogenesis. Therefore, this receptor activator for nuclear factor-kappaB ligand (RANKL)-induced Mitf phenomenon seems to play an important role during osteoclastogenesis. Although the current theory indicates that Mitf and its binding partner Tfe3 are completely redundant in osteoclasts, using RNA interference, we demonstrated that Mitf has a distinct role from Tfe3. This study provides the first evidence that RANKL-induced Mitf is critical for osteoclastogenesis and Mitf is not completely redundant with Tfe3.
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Affiliation(s)
- Ssu-Yi Lu
- Section of Oral Pathology, Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA 90095, USA
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Wang Y, Radfar S, Liu S, Riker AI, Khong HT. Mitf-Mdel, a novel melanocyte/melanoma-specific isoform of microphthalmia-associated transcription factor-M, as a candidate biomarker for melanoma. BMC Med 2010; 8:14. [PMID: 20163701 PMCID: PMC2839965 DOI: 10.1186/1741-7015-8-14] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 02/17/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Melanoma incidence is on the rise and advanced melanoma carries an extremely poor prognosis. Treatment options, including chemotherapy and immunotherapy, are limited and offer low response rates and transient efficacy. Thus, identification of new melanocyte/melanoma antigens that serve as potential novel candidate biomarkers in melanoma is an important area for investigation. METHODS Full length MITF-M and its splice variant cDNA were cloned from human melanoma cell line 624 mel by reverse transcription polymerase chain reaction (RT-PCR). Expression was investigated using regular and quantitative RT-PCR in three normal melanocytes (NHEM), 31 melanoma cell lines, 21 frozen melanoma tissue samples, 18 blood samples (peripheral blood mononuclear cell; PBMC) from healthy donors and 12 non-melanoma cancer cell lines, including three breast, five glioma, one sarcoma, two kidney and one ovarian cancer cell lines. RESULTS A novel splice variant of MITF-M, which we named MITF-Mdel, was identified. The predicted MITF-Mdel protein contains two in frame deletions, 56- and 6- amino acid deletions in exon 2 (from V32 to E87) and exon 6 (from A187 to T192), respectively. MITF-Mdel was widely expressed in melanocytes, melanoma cell lines and tissues, but almost undetectable in non-melanoma cell lines or PBMC from healthy donors. Both isoforms were expressed significantly higher in melanoma tissues than in cell lines. Two of 31 melanoma cell lines expressed only one isoform or the other. CONCLUSION MITF-Mdel, a novel melanocyte/melanoma-specific isoform of MITF-M, may serve as a potential candidate biomarker for diagnostic and follow-up purposes in melanoma.
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Affiliation(s)
- Yixiang Wang
- Mitchell Cancer Institute, University of South Alabama, 1660 Springhill Avenue, Mobile, AL 36604, USA
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Identification of microphthalmia-associated transcription factor isoforms in dogs. Vet J 2009; 182:283-93. [DOI: 10.1016/j.tvjl.2008.06.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2007] [Revised: 06/04/2008] [Accepted: 06/06/2008] [Indexed: 11/22/2022]
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Ma W, Yan RT, Li X, Wang SZ. Reprogramming retinal pigment epithelium to differentiate toward retinal neurons with Sox2. Stem Cells 2009; 27:1376-87. [PMID: 19489100 DOI: 10.1002/stem.48] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Guiding non-neural, retinal pigment epithelium (RPE) to produce retinal neurons may offer a source of developing neurons for cell-replacement. Sox2 plays important roles in maintaining neural progenitor/stem cell properties and in converting fibroblasts into pluripotent stem cells. This study tests the possibility of using Sox2 to reprogram RPE to differentiate toward retinal neurons in vivo and in vitro. Expression of Sox2 in the chick retina was detected in progenitor cells, in cells at a discrete location in the layers of amacrine and ganglion cells, and in Muller glia. Overexpression of Sox2 in the developing eye resulted in hypopigmentation of the RPE. In the affected regions, expression of retinal ganglion cell markers became apparent in the RPE layer. In RPE cell culture, Sox2 promoted the expression of retinal ganglion and amacrine markers, and suppressed the expression of genes associated with RPE properties. Mechanistic investigation using the developing retina revealed a coexpression of Sox2 and basic fibroblast growth factor (bFGF), a growth factor commonly used in stem cell culture and capable of inducing RPE-to-retina transdifferentiation (or reprogramming) during early development. Similar patterns of changes in Sox2 expression and in bFGF expression were observed in atrophic retina and in injured retina. In RPE cell culture, Sox2 and bFGF mutually enhanced one another's expression. Upregulation of bFGF expression by Sox2 also occurred in the retina. These results suggest that Sox2 can initiate a reprogramming of RPE cells to differentiate toward retinal neurons and may engage bFGF during the process.
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Affiliation(s)
- Wenxin Ma
- Department of Ophthalmology, University of Alabama at Birmingham, Birmingham, AL, USA
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