1
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Yin Z, Ma Z, Wang S, Hao S, Liu X, Pang Q, Wang X. Expression and tissue distribution analysis of vimentin and transthyretin proteins associated with coat colors in sheep (Ovis aries). Anim Biosci 2023; 36:1367-1375. [PMID: 37402463 PMCID: PMC10472160 DOI: 10.5713/ab.23.0111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 05/05/2023] [Accepted: 05/22/2023] [Indexed: 07/06/2023] Open
Abstract
OBJECTIVE Pigment production and distribution are controlled through multiple proteins, resulting in different coat color phenotypes of sheep. METHODS The expression distribution of vimentin (VIM) and transthyretin (TTR) in white and black sheep skins was detected by liquid chromatography-electrospray ionization tandem MS (LC-ESI-MS/MS), gene ontology (GO) statistics, immunohistochemistry, Western blot, and quantitative real time polymerase chain reaction (qRT-PCR) to evaluate their role in the coat color formation of sheep. RESULTS LC-ESI-MS/MS results showed VIM and TTR proteins in white and black skin tissues of sheep. Meanwhile, GO functional annotation analysis suggested that VIM and TTR proteins were mainly concentrated in cellular components and biological process, respectively. Further research confirmed that VIM and TTR proteins were expressed at significantly higher levels in black sheep skins than in white sheep skins by Western blot, respectively. Immunohistochemistry notably detected VIM and TTR in hair follicle, dermal papilla, and outer root sheath of white and black sheep skins. qRT-PCR results also revealed that the expression of VIM and TTR mRNAs was higher in black sheep skins than in white sheep skins. CONCLUSION The expression of VIM and TTR were higher in black sheep skins than in white sheep skins and the transcription and translation were unanimous in this study. VIM and TTR proteins were expressed in hair follicles of white and black sheep skins. These results suggested that VIM and TTR were involved in the coat color formation of sheep.
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Affiliation(s)
- Zhihong Yin
- Postdoctoral Research Base, College of Veterinary Medicine, Henan Agricultural University, Zhengzhou 450046,
China
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003,
China
| | - Zhisheng Ma
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003,
China
| | - Siting Wang
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003,
China
| | - Shitong Hao
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003,
China
| | - Xinyou Liu
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003,
China
| | - Quanhai Pang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801,
China
| | - Xinzhuang Wang
- Postdoctoral Research Base, College of Veterinary Medicine, Henan Agricultural University, Zhengzhou 450046,
China
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Brancalion L, Haase B, Wade CM. Canine coat pigmentation genetics: a review. Anim Genet 2021; 53:3-34. [PMID: 34751460 DOI: 10.1111/age.13154] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 09/21/2021] [Accepted: 10/20/2021] [Indexed: 11/27/2022]
Abstract
Our understanding of canine coat colour genetics and the associated health implications is developing rapidly. To date, there are 15 genes with known roles in canine coat colour phenotypes. Many coat phenotypes result from complex and/or epistatic genetic interactions among variants within and between loci, some of which remain unidentified. Some genes involved in canine pigmentation have been linked to aural, visual and neurological impairments. Consequently, coat pigmentation in the domestic dog retains considerable ethical and economic interest. In this paper we discuss coat colour phenotypes in the domestic dog, the genes and variants responsible for these phenotypes and any proven coat colour-associated health effects.
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Affiliation(s)
- L Brancalion
- Faculty of Science, School of Life and Environmental Sciences, University of Sydney, Camperdown, NSW, 2006, Australia
| | - B Haase
- Faculty of Science, School of Veterinary Science, University of Sydney, Camperdown, NSW, 2006, Australia
| | - C M Wade
- Faculty of Science, School of Life and Environmental Sciences, University of Sydney, Camperdown, NSW, 2006, Australia
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Guillot R, Muriach B, Rocha A, Rotllant J, Kelsh RN, Cerdá-Reverter JM. Thyroid Hormones Regulate Zebrafish Melanogenesis in a Gender-Specific Manner. PLoS One 2016; 11:e0166152. [PMID: 27832141 PMCID: PMC5104317 DOI: 10.1371/journal.pone.0166152] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 10/24/2016] [Indexed: 11/18/2022] Open
Abstract
Zebrafish embryos are treated with anti-thyroidal compounds, such as phenylthiourea, to inhibit melanogenesis. However, the mechanism whereby the thyroidal system controls melanin synthesis has not been assessed in detail. In this work, we tested the effect of the administration of diets supplemented with T3 (500μg/g food) on the pigment pattern of adult zebrafish. Oral T3 induced a pronounced skin paling in both adult female and male zebrafish that was reversible upon cessation of treatment. The number of visible melanophores was significantly reduced in treated fish. Accordingly, treatment down-regulated expression of tyrosinase-related protein 1 in both sexes. We also found sexually dimorphic regulation of some melanogenic genes, such as Dct/Tyrp2 that was dramatically up-regulated in females after T3 treatment. Thus, we demonstrated that melanogenesis is reversibly inhibited by thyroid hormones in adult zebrafish and make the discovery of gender-specific differences in the response of melanogenic gene expression. Thus, fish gender is now shown to be an important variable that should be controlled in future studies of fish melanogenesis.
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Affiliation(s)
- Raúl Guillot
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas, (IATS-CSIC), Ribera de Cabanes, Castellón, Spain, 12595
| | - Borja Muriach
- Facultad Ciencias de la Salud, Universidad CEU Cardenal Herrera, Castellón, Spain, 12006
| | - Ana Rocha
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas, (IATS-CSIC), Ribera de Cabanes, Castellón, Spain, 12595
| | - Josep Rotllant
- Aquatic Molecular Pathobiology Group, Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, (IIM-CSIC), Vigo, Spain, 36208
| | - Robert N. Kelsh
- Centre for Regenerative Medicine and Developmental Biology Programme, Department of Biology and Biochemistry, University of Bath, Bath, England BA2 7AY
| | - José Miguel Cerdá-Reverter
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas, (IATS-CSIC), Ribera de Cabanes, Castellón, Spain, 12595
- * E-mail:
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Koludrovic D, Laurette P, Strub T, Keime C, Le Coz M, Coassolo S, Mengus G, Larue L, Davidson I. Chromatin-Remodelling Complex NURF Is Essential for Differentiation of Adult Melanocyte Stem Cells. PLoS Genet 2015; 11:e1005555. [PMID: 26440048 PMCID: PMC4595011 DOI: 10.1371/journal.pgen.1005555] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 09/07/2015] [Indexed: 12/23/2022] Open
Abstract
MIcrophthalmia-associated Transcription Factor (MITF) regulates melanocyte and melanoma physiology. We show that MITF associates the NURF chromatin-remodelling factor in melanoma cells. ShRNA-mediated silencing of the NURF subunit BPTF revealed its essential role in several melanoma cell lines and in untransformed melanocytes in vitro. Comparative RNA-seq shows that MITF and BPTF co-regulate overlapping gene expression programs in cell lines in vitro. Somatic and specific inactivation of Bptf in developing murine melanoblasts in vivo shows that Bptf regulates their proliferation, migration and morphology. Once born, Bptf-mutant mice display premature greying where the second post-natal coat is white. This second coat is normally pigmented by differentiated melanocytes derived from the adult melanocyte stem cell (MSC) population that is stimulated to proliferate and differentiate at anagen. An MSC population is established and maintained throughout the life of the Bptf-mutant mice, but these MSCs are abnormal and at anagen, give rise to reduced numbers of transient amplifying cells (TACs) that do not express melanocyte markers and fail to differentiate into mature melanin producing melanocytes. MSCs display a transcriptionally repressed chromatin state and Bptf is essential for reactivation of the melanocyte gene expression program at anagen, the subsequent normal proliferation of TACs and their differentiation into mature melanocytes. The melanocytes pigmenting the coat of adult mice derive from the melanocyte stem cell population residing in the permanent bulge area of the hair follicle. At each angen phase, melanocyte stem cells are stimulated to generate proliferative transient amplifying cells that migrate to the bulb of the follicle where they differentiate into mature melanin producing melanocytes, a processes involving MIcrophthalmia-associated Transcription Factor (MITF) the master regulator of the melanocyte lineage. We show that MITF associates with the NURF chromatin-remodelling factor in melanoma cells. NURF acts downstream of MITF in melanocytes and melanoma cells co-regulating gene expression in vitro. In vivo, mice lacking the NURF subunit Bptf in the melanocyte lineage show premature greying as they are unable to generate mature melanocytes from the adult stem cell population. We find that the melanocyte stem cells from these animals are abnormal and that once they are stimulated at anagen, Bptf is required to ensure the expression of melanocyte markers and their differentiation into mature adult melanocytes. Chromatin remodelling by NURF therefore appears to be essential for the transition of the transcriptionally quiescent stem cell to the differentiated state.
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Affiliation(s)
- Dana Koludrovic
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France
- Beaston Institute for Cancer Research, Glasgow, United Kingdom
| | - Patrick Laurette
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France
| | - Thomas Strub
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
| | - Céline Keime
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France
| | - Madeleine Le Coz
- Institut Curie CNRS UMR3347, INSERM U1021, Bat 110, Orsay, France
| | - Sebastien Coassolo
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France
| | - Gabrielle Mengus
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France
| | - Lionel Larue
- Institut Curie CNRS UMR3347, INSERM U1021, Bat 110, Orsay, France
- Equipes labélisées Ligue Contre le Cancer, Orsay and Strasbourg, France
| | - Irwin Davidson
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France
- Equipes labélisées Ligue Contre le Cancer, Orsay and Strasbourg, France
- * E-mail:
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Rifkin RF, Dayet L, Queffelec A, Summers B, Lategan M, d’Errico F. Evaluating the Photoprotective Effects of Ochre on Human Skin by In Vivo SPF Assessment: Implications for Human Evolution, Adaptation and Dispersal. PLoS One 2015; 10:e0136090. [PMID: 26353012 PMCID: PMC4564224 DOI: 10.1371/journal.pone.0136090] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 07/29/2015] [Indexed: 11/18/2022] Open
Abstract
Archaeological indicators of cognitively modern behaviour become increasingly prevalent during the African Middle Stone Age (MSA). Although the exploitation of ochre is viewed as a key feature of the emergence of modern human behaviour, the uses to which ochre and ochre-based mixtures were put remain ambiguous. Here we present the results of an experimental study exploring the efficacy of ochre as a topical photoprotective compound. This is achieved through the in vivo calculation of the sun protection factor (SPF) values of ochre samples obtained from Ovahimba women (Kunene Region, Northern Namibia) and the Palaeozoic Bokkeveld Group deposits of the Cape Supergroup (Western Cape Province, South Africa). We employ visible spectroscopy, energy-dispersive X-ray fluorescence (ED-XRF), X-ray diffraction (XRD) and granulometric analyses to characterise ochre samples. The capacity of ochre to inhibit the susceptibility of humans to the harmful effects of exposure to ultraviolet radiation (UVR) is confirmed and the mechanisms implicated in the efficacy of ochre as a sunscreen identified. It is posited that the habitual application of ochre may have represented a crucial innovation for MSA humans by limiting the adverse effects of ultraviolet exposure. This may have facilitated the colonisation of geographic regions largely unfavourable to the constitutive skin colour of newly arriving populations.
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Affiliation(s)
- Riaan F. Rifkin
- Institute for Archaeology, History, Culture and Religion, University of Bergen, Bergen, Norway
- Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
| | - Laure Dayet
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche, University of Bordeaux, Pessac, France
| | - Alain Queffelec
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche, University of Bordeaux, Pessac, France
| | - Beverley Summers
- Photobiology Laboratory, Department of Pharmacy, University of Limpopo, Medunsa, South Africa
| | - Marlize Lategan
- Photobiology Laboratory, Department of Pharmacy, University of Limpopo, Medunsa, South Africa
| | - Francesco d’Errico
- Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche, University of Bordeaux, Pessac, France
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Abstract
INTRODUCTION Melanocytes produce pigment granules that color both skin and hair. In the hair follicles melanocytes are derived from stem cells (MelSCs) that are present in hair bulges or sub-bulge regions and function as melanocyte reservoirs. Quiescence, maintenance, activation and proliferation of MelSCs are controlled by specific activities in the microenvironment that can influence the differentiation and regeneration of melanocytes. Therefore, understanding MelSCs and their niche may lead to use of MelSCs in new treatments for various pigmentation disorders. AREAS COVERED We describe here pathophysiological mechanisms by which melanocyte defects lead to skin pigmentation disorders such as vitiligo and hair graying. The development, migration and proliferation of melanocytes and factors involved in the survival, maintenance and regeneration of MelSCs are reviewed with regard to the biological roles and potential therapeutic applications in skin pigmentation diseases. EXPERT OPINION MelSC biology and niche factors have been studied mainly in murine experimental models. Human MelSC markers or methods to isolate them are much less well understood. Identification, isolation and culturing of human MelSCs would represent a major step toward new biological therapeutic options for patients with recalcitrant pigmentary disorders or hair graying. By modulating the niche factors for MelSCs, it may one day be possible to control skin pigmentary disorders and prevent or reverse hair graying.
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Affiliation(s)
- Ju Hee Lee
- Massachusetts General Hospital, Harvard Medical School, Department of Dermatology and Cutaneous Biology Research Center , Boston, MA 02129 , USA +1 617 643 5428 ; +1 617 643 6588 ;
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Seleit I, Bakry OA, Abdou AG, Dawoud NM. Immunohistochemical evaluation of vitiliginous hair follicle melanocyte reservoir: is it retained? J Eur Acad Dermatol Venereol 2014; 29:444-51. [PMID: 24909913 DOI: 10.1111/jdv.12573] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 04/29/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Vitiligo is an acquired depigmentaion of skin and hair. The presence of white hair within vitiligo lesions is considered a bad prognostic sign since these lesions are difficult to repigment. Melanocyte reservoir was not extensively studied in vitiliginous white hair. OBJECTIVE To evaluate pigment cell reservoir in vitiliginous black and white hair. METHOD Using immunohistochemical technique, skin biopsies from 30 vitiligo patients (including either black or white hair) and 10 age- and gender-matched healthy subjects were examined. Human Melanoma Black-45 (HMB-45) was used for detecting active melanocytes and Tyrosinase Related Protein 2 (TRP2) for detecting the whole melanocyte lineage including melanocyte stem cells (MelSC). RESULTS About 61.1% of black hair was positive for HMB-45 and 83.3% was positive for TRP2. About 25% of white hair was positive for HMB-45 and 75% retained TRP2 positivity. Follicular HMB-45 expression and TRP2 expression percentage were significantly lower in white than black hair (P = 0.05, 0.04 respectively). Epidermal HMB-45 and TRP2 expression percentages were significantly higher in lesions containing black rather than white hair (P < 0.001, P = 0.05 respectively). Black hair was significantly associated with histologically pigmented hair follicles (P = 0.049), and with residual interfollicular melanin pigment (P = 0.007). CONCLUSION Melanocytes, either active (melanotic) or inactive (amelanotic which may include MelSC), are not totally absent from vitiliginous white hair. However, intact melanocyte reservoir was observed more in black than white hair. This may add avenues for future research about the possibility of white vitiliginous hair to repigment.
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Affiliation(s)
- I Seleit
- Faculty of Medicine, Department of Dermatology, Andrology and STDs, Menoufiya University, Shebein Elkom, Egypt
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Seleit I, Bakry OA, Abdou AG, Dawoud NM. Immunohistochemical study of melanocyte-melanocyte stem cell lineage in vitiligo; a clue to interfollicular melanocyte stem cell reservoir. Ultrastruct Pathol 2014; 38:186-98. [PMID: 24460782 DOI: 10.3109/01913123.2013.870274] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
There has been a long lasting controversy over whether melanocytes (MCs) in vitiligo are actually lost or still present but functionally inactive. We aimed to evaluate the MC cell lineage in follicular and interfollicular vitiliginous epidermis through immunohistochemical localization of Human Melanoma Black-45 (HMB-45) and Tyrosinase Related Protein 2 (TRP2) and to correlate it with clinicopathologic parameters. Using immunohistochemical techniques, skin biopsies from 50 vitiligo patients and 20 age- and gender-matched healthy subjects were examined. Differentiated active MCs were detected in 44% of interfollicular epidermis (IFE) and 46.7% of follicular epidermis (FE) in lesional skin. Melanocyte precursors/stem cells were detected in 54% of IFE and 63.3% of FE in lesional skin. Melanocyte precursors/stem cells of IFE were significantly associated with residual melanin pigment (p = 0.007) and with absence of angiogenesis (p = 0.05). HMB-45 percentage of expression in IFE was positively correlated with MC precursors/stem cells percentage in FE (r = +0.65, p < 0.001) and IFE (r = +0.33, p = 0.01). Melanocyte precursors/stem cells positivity (p < 0.001) was progressively decreasing with advanced histopathologic grading. There was no significant association between interfollicular or follicular expression of HMB-45, TRP2 or MC precursors/stem cells and the clinical type of vitiligo or its duration. In conclusion, functioning MCs may exist in vitiligo. The presence of MC precursors/stem cells in IFE may provide an additional reservoir needed for repigmentation.
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Affiliation(s)
- Iman Seleit
- Department of Dermatology, Andrology and STDs and
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9
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Abstract
Survival of lymphocytes and melanocyte stem cells critically depends on B cell lymphoma 2 (Bcl-2). In T lymphocytes, a basal calcineurin activity maintains Bcl-2 expression in naïve cells, and the activation of the calcineurin pathway orchestrates the regulation of the intrinsic apoptosis pathway after antigen recognition. Therefore, calcineurin inhibitors might potentiate the pro-apoptotic effect of pharmacological Bcl-2 inhibitors on lymphatic cells. In vitro, a reduced Bcl-2 expression in lymphocytes exposed to calcineurin inhibitors increased their sensitivity to the small molecule Bcl-2 inhibitor ABT-737. This correlated with an augmented pro-apoptotic activity of ABT-737 on lymphocytes in combination with cyclosporine A in naïve mice in vivo. Interestingly, similar processes were observed in melanocytes. ABT-737 induced a fur depigmentation at the site of injection, and this effect was expanded to a generalized depigmentation in combination with cyclosporine A. Thus, inhibiting calcineurin increases the pro-apoptotic potency of ABT-737 in cells depending on Bcl-2 for survival. The increased efficacy of Bcl-2 inhibitors in combination with cyclosporine A might be relevant to exploit their anti-neoplastic and immuno-modulatory properties.
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Gola M, Czajkowski R, Bajek A, Dura A, Drewa T. Melanocyte stem cells: biology and current aspects. Med Sci Monit 2013; 18:RA155-9. [PMID: 23018363 PMCID: PMC3560550 DOI: 10.12659/msm.883475] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Epidermal stem cells have become an object of intensive research. The epidermis constitutes one of the main sources of stem cells and is a tissue of choice for use in exploring their biology. Stratified squamous epithelium (epidermis) possesses the capacity for self-renewal and repair due to the presence of epidermal stem cells (ESC). They have been identified within basal layer of the interfollicular epidermis (IFE), in the “bulge” of the hair follicles of rodents, and also in the human follicular bulge. Melanocyte stem cells (MSC) from hair follicles (precisely from the bulge region, which also contains epidermal stem cells) provide an attractive model for the study of stem cells and their regulation at the niche. This review summarizes the rapidly developing field of epidermal stem cell research and their application in regenerative medicine, paying particular attention to melanocyte stem cells, their biology and some of the processes that occur during hair graying and regeneration of the pigmentary system, as well as discussing how aged-associated changes in the melanocyte stem cells compartment impact hair graying. This review also includes differentiation of human skin stem cells into functional epidermal melanocytes.
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Affiliation(s)
- Monika Gola
- Department of Tissue Engineering, Nicolaus Copernicus University, Bydgoszcz, Poland
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Pshenichnaya I, Schouwey K, Armaro M, Larue L, Knoepfler PS, Eisenman RN, Trumpp A, Delmas V, Beermann F. Constitutive gray hair in mice induced by melanocyte-specific deletion of c-Myc. Pigment Cell Melanoma Res 2012; 25:312-25. [PMID: 22420299 DOI: 10.1111/j.1755-148x.2012.00998.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
c-Myc is involved in the control of diverse cellular processes and implicated in the maintenance of different tissues including the neural crest. Here, we report that c-Myc is particularly important for pigment cell development and homeostasis. Targeting c-Myc specifically in the melanocyte lineage using the floxed allele of c-Myc and Tyr::Cre transgenic mice results in a congenital gray hair phenotype. The gray coat color is associated with a reduced number of functional melanocytes in the hair bulb and melanocyte stem cells in the hair bulge. Importantly, the gray phenotype does not progress with time, suggesting that maintenance of the melanocyte through the hair cycle does not involve c-Myc function. In embryos, at E13.5, c-Myc-deficient melanocyte precursors are affected in proliferation in concordance with a reduction in numbers, showing that c-Myc is required for the proper melanocyte development. Interestingly, melanocytes from c-Myc-deficient mice display elevated levels of the c-Myc paralog N-Myc. Double deletion of c-Myc and N-Myc results in nearly complete loss of the residual pigmentation, indicating that N-Myc is capable of compensating for c-Myc loss of function in melanocytes.
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Affiliation(s)
- Irina Pshenichnaya
- Swiss Institute for Experimental Cancer Research, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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Maddirevula S, Anuppalle M, Huh TL, Kim SH, Rhee M. Nrdp1 governs differentiation of the melanocyte lineage via Erbb3b signaling in the zebrafish embryogenesis. Biochem Biophys Res Commun 2011; 409:454-8. [DOI: 10.1016/j.bbrc.2011.05.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 05/03/2011] [Indexed: 10/18/2022]
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Budi EH, Patterson LB, Parichy DM. Post-embryonic nerve-associated precursors to adult pigment cells: genetic requirements and dynamics of morphogenesis and differentiation. PLoS Genet 2011; 7:e1002044. [PMID: 21625562 PMCID: PMC3098192 DOI: 10.1371/journal.pgen.1002044] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 02/18/2011] [Indexed: 01/17/2023] Open
Abstract
The pigment cells of vertebrates serve a variety of functions and generate a
stunning variety of patterns. These cells are also implicated in human
pathologies including melanoma. Whereas the events of pigment cell development
have been studied extensively in the embryo, much less is known about
morphogenesis and differentiation of these cells during post-embryonic stages.
Previous studies of zebrafish revealed genetically distinct populations of
embryonic and adult melanophores, the ectotherm homologue of amniote
melanocytes. Here, we use molecular markers, vital labeling, time-lapse imaging,
mutational analyses, and transgenesis to identify peripheral nerves as a niche
for precursors to adult melanophores that subsequently migrate to the skin to
form the adult pigment pattern. We further identify genetic requirements for
establishing, maintaining, and recruiting precursors to the adult melanophore
lineage and demonstrate novel compensatory behaviors during pattern regulation
in mutant backgrounds. Finally, we show that distinct populations of latent
precursors having differential regenerative capabilities persist into the adult.
These findings provide a foundation for future studies of post-embryonic pigment
cell precursors in development, evolution, and neoplasia. Understanding the biology of post-embryonic stem and progenitor cells is of both
basic and translational importance. To identify mechanisms by which stem and
progenitor cells are established, maintained, and recruited to particular fates,
we are using the zebrafish adult pigment pattern. Previous work showed that
embryonic and adult pigment cells have different genetic requirements, but
little is known about the molecular or proliferative phenotypes of precursors to
adult pigment cells or where these precursors reside during post-embryonic
development. We show here that post-embryonic pigment cell precursors are
associated with peripheral nerves and that these cells migrate to the skin
during the larval-to-adult transformation when the adult pigment pattern forms.
We also define morphogenetic and differentiative roles for several genes in
promoting these events. Finally, we demonstrate that latent precursor pools
persist into the adult and that different pools have different capacities for
supplying new pigment cells in the context of pattern regeneration. Our study
sets the stage for future analyses to identify additional common and essential
features of pigment stem cell biology.
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Affiliation(s)
- Erine H. Budi
- Department of Biology, University of
Washington, Seattle, Washington, United States of America
- Graduate Program in Molecular and Cellular
Biology, University of Washington, Seattle, Washington, United States of
America
| | - Larissa B. Patterson
- Department of Biology, University of
Washington, Seattle, Washington, United States of America
- Graduate Program in Biology, University of
Washington, Seattle, Washington, United States of America
| | - David M. Parichy
- Department of Biology, University of
Washington, Seattle, Washington, United States of America
- * E-mail:
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Lang MR, Patterson LB, Gordon TN, Johnson SL, Parichy DM. Basonuclin-2 requirements for zebrafish adult pigment pattern development and female fertility. PLoS Genet 2009; 5:e1000744. [PMID: 19956727 PMCID: PMC2776513 DOI: 10.1371/journal.pgen.1000744] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2009] [Accepted: 10/27/2009] [Indexed: 11/19/2022] Open
Abstract
Relatively little is known about the generation of adult form. One complex adult trait that is particularly amenable to genetic and experimental analysis is the zebrafish pigment pattern, which undergoes extensive remodeling during post-embryonic development to form adult stripes. These stripes result from the arrangement of three classes of neural crest-derived pigment cells, or chromatophores: melanophores, xanthophores, and iridophores. Here, we analyze the zebrafish bonaparte mutant, which has a normal early pigment pattern but exhibits a severe disruption to the adult stripe pattern. We show that the bonaparte mutant phenotype arises from mutations in basonuclin-2 (bnc2), encoding a highly conserved, nuclear-localized zinc finger protein of unknown function. We show that bnc2 acts non-autonomously to the melanophore lineage and is expressed by hypodermal cells adjacent to chromatophores during adult pigment pattern formation. In bonaparte (bnc2) mutants, all three types of chromatophores differentiate but then are lost by extrusion through the skin. We further show that while bnc2 promotes the development of two genetically distinct populations of melanophores in the body stripes, chromatophores of the fins and scales remain unaffected in bonaparte mutants, though a requirement of fin chromatophores for bnc2 is revealed in the absence of kit and colony stimulating factor-1 receptor activity. Finally, we find that bonaparte (bnc2) mutants exhibit dysmorphic ovaries correlating with infertility and bnc2 is expressed in somatic ovarian cells, whereas the related gene, bnc1, is expressed within oocytes; and we find that both bnc2 and bnc1 are expressed abundantly within the central nervous system. These findings identify bnc2 as an important mediator of adult pigment pattern formation and identify bonaparte mutants as an animal model for dissecting bnc2 functions.
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Affiliation(s)
- Michael R. Lang
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - Larissa B. Patterson
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - Tiffany N. Gordon
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - Stephen L. Johnson
- Department of Genetics, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - David M. Parichy
- Department of Biology, University of Washington, Seattle, Washington, United States of America
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