351
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Simons BD. Deep sequencing as a probe of normal stem cell fate and preneoplasia in human epidermis. Proc Natl Acad Sci U S A 2016; 113:128-33. [PMID: 26699486 PMCID: PMC4711853 DOI: 10.1073/pnas.1516123113] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Using deep sequencing technology, methods based on the sporadic acquisition of somatic DNA mutations in human tissues have been used to trace the clonal evolution of progenitor cells in diseased states. However, the potential of these approaches to explore cell fate behavior of normal tissues and the initiation of preneoplasia remain underexploited. Focusing on the results of a recent deep sequencing study of eyelid epidermis, we show that the quantitative analysis of mutant clone size provides a general method to resolve the pattern of normal stem cell fate and to detect and characterize the mutational signature of rare field transformations in human tissues, with implications for the early detection of preneoplasia.
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Affiliation(s)
- Benjamin D Simons
- Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom; Wellcome Trust/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom; Wellcome Trust-Medical Research Council Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, United Kingdom
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352
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Oh JW, Kloepper J, Langan EA, Kim Y, Yeo J, Kim MJ, Hsi TC, Rose C, Yoon GS, Lee SJ, Seykora J, Kim JC, Sung YK, Kim M, Paus R, Plikus MV. A Guide to Studying Human Hair Follicle Cycling In Vivo. J Invest Dermatol 2016; 136:34-44. [PMID: 26763421 PMCID: PMC4785090 DOI: 10.1038/jid.2015.354] [Citation(s) in RCA: 187] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 08/19/2015] [Accepted: 08/24/2015] [Indexed: 12/17/2022]
Abstract
Hair follicles (HFs) undergo lifelong cyclical transformations, progressing through stages of rapid growth (anagen), regression (catagen), and relative "quiescence" (telogen). Given that HF cycling abnormalities underlie many human hair growth disorders, the accurate classification of individual cycle stages within skin biopsies is clinically important and essential for hair research. For preclinical human hair research purposes, human scalp skin can be xenografted onto immunocompromised mice to study human HF cycling and manipulate long-lasting anagen in vivo. Although available for mice, a comprehensive guide on how to recognize different human hair cycle stages in vivo is lacking. In this article, we present such a guide, which uses objective, well-defined, and reproducible criteria, and integrates simple morphological indicators with advanced, (immuno)-histochemical markers. This guide also characterizes human HF cycling in xenografts and highlights the utility of this model for in vivo hair research. Detailed schematic drawings and representative micrographs provide examples of how best to identify human HF stages, even in suboptimally sectioned tissue, and practical recommendations are given for designing human-on-mouse hair cycle experiments. Thus, this guide seeks to offer a benchmark for human hair cycle stage classification, for both hair research experts and newcomers to the field.
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Affiliation(s)
- Ji Won Oh
- Hair Transplantation Center, Kyungpook National University Hospital, Daegu, Korea; Department of Immunology, Kyungpook National University School of Medicine, Daegu, Korea; Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | | | - Ewan A Langan
- Department of Dermatology, University of Lübeck, Lübeck, Germany; Comprehensive Centre for Inflammation Research, University of Lübeck, Germany
| | - Yongsoo Kim
- Division of Molecular Pathology, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Joongyeub Yeo
- Institute for Computational and Mathematical Engineering, Stanford University, Stanford, California, USA
| | - Min Ji Kim
- Department of Dermatology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Tsai-Ching Hsi
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | - Christian Rose
- Dermatohistologisches Labor Rose/Bartsch, Lübeck, Germany
| | - Ghil Suk Yoon
- Department of Pathology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Seok-Jong Lee
- Department of Dermatology, Kyungpook National University School of Medicine, Daegu, Korea
| | - John Seykora
- Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jung Chul Kim
- Hair Transplantation Center, Kyungpook National University Hospital, Daegu, Korea; Department of Immunology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Young Kwan Sung
- Department of Immunology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Moonkyu Kim
- Hair Transplantation Center, Kyungpook National University Hospital, Daegu, Korea; Department of Immunology, Kyungpook National University School of Medicine, Daegu, Korea.
| | - Ralf Paus
- Dermatology Research Centre, Institute of Inflammation and Repair, University of Manchester, Manchester, UK; Department of Dermatology, University of Münster, Münster, Germany.
| | - Maksim V Plikus
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA.
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353
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Lin BJ, Wang J, Miao Y, Liu YQ, Jiang W, Fan ZX, Darabi MA, Hu ZQ, Xing M. Cytokine loaded layer-by-layer ultrathin matrices to deliver single dermal papilla cells for spot-by-spot hair follicle regeneration. J Mater Chem B 2016; 4:489-504. [PMID: 32263213 DOI: 10.1039/c5tb02265g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Polymer nanocoated dermal papilla cells promoting hair regeneration.
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Affiliation(s)
- Bo-jie Lin
- Department of Plastic and Aesthetic Surgery
- Nanfang Hospital of Southern Medical University
- Guangzhou
- China
- Department of Mechanical Engineering
| | - Jin Wang
- Department of Plastic and Aesthetic Surgery
- Nanfang Hospital of Southern Medical University
- Guangzhou
- China
| | - Yong Miao
- Department of Plastic and Aesthetic Surgery
- Nanfang Hospital of Southern Medical University
- Guangzhou
- China
| | - Yu-qing Liu
- Department of Mechanical Engineering
- University of Manitoba
- Winnipeg
- Canada
| | - Wei Jiang
- Department of Plastic and Aesthetic Surgery
- Nanfang Hospital of Southern Medical University
- Guangzhou
- China
| | - Zhe-xiang Fan
- Department of Plastic and Aesthetic Surgery
- Nanfang Hospital of Southern Medical University
- Guangzhou
- China
| | | | - Zhi-qi Hu
- Department of Plastic and Aesthetic Surgery
- Nanfang Hospital of Southern Medical University
- Guangzhou
- China
| | - Malcolm Xing
- Department of Mechanical Engineering
- University of Manitoba
- Winnipeg
- Canada
- Children's Hospital Research Institute of Manitoba
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354
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Naska S, Yuzwa SA, Johnston APW, Paul S, Smith KM, Paris M, Sefton MV, Datti A, Miller FD, Kaplan DR. Identification of Drugs that Regulate Dermal Stem Cells and Enhance Skin Repair. Stem Cell Reports 2015; 6:74-84. [PMID: 26724904 PMCID: PMC4719140 DOI: 10.1016/j.stemcr.2015.12.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 12/01/2015] [Accepted: 12/01/2015] [Indexed: 01/24/2023] Open
Abstract
Here, we asked whether we could identify pharmacological agents that enhance endogenous stem cell function to promote skin repair, focusing on skin-derived precursors (SKPs), a dermal precursor cell population. Libraries of compounds already used in humans were screened for their ability to enhance the self-renewal of human and rodent SKPs. We identified and validated five such compounds, and showed that two of them, alprostadil and trimebutine maleate, enhanced the repair of full thickness skin wounds in middle-aged mice. Moreover, SKPs isolated from drug-treated skin displayed long-term increases in self-renewal when cultured in basal growth medium without drugs. Both alprostadil and trimebutine maleate likely mediated increases in SKP self-renewal by moderate hyperactivation of the MEK-ERK pathway. These findings identify candidates for potential clinical use in human skin repair, and provide support for the idea that pharmacological activation of endogenous tissue precursors represents a viable therapeutic strategy. Small-molecule screens identify compounds that enhance SKP self-renewal Alprostadil and trimebutine maleate both increase SKP self-renewal Both compounds likely act by promoting activation of the MEK-ERK pathway Both compounds activated dermal precursors in vivo to enhance wound healing
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Affiliation(s)
- Sibel Naska
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Scott A Yuzwa
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Adam P W Johnston
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Smitha Paul
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Kristen M Smith
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Maryline Paris
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Michael V Sefton
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5G 1X5, Canada
| | - Alessandro Datti
- S.M.A.R.T. Laboratory for High-Throughput Screening Programs, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, ON M5G 1X5, Canada; Department of Agricultural, Food, and Environmental Sciences, University of Perugia, 06121 Perugia, Italy
| | - Freda D Miller
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1X5, Canada; Department of Physiology, University of Toronto, Toronto, ON M5G 1X5, Canada.
| | - David R Kaplan
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1X5, Canada.
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355
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Epigenetic Regulation of Epidermal Stem Cell Biomarkers and Their Role in Wound Healing. Int J Mol Sci 2015; 17:ijms17010016. [PMID: 26712738 PMCID: PMC4730263 DOI: 10.3390/ijms17010016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 12/11/2015] [Accepted: 12/16/2015] [Indexed: 12/11/2022] Open
Abstract
As an actively renewable tissue, changes in skin architecture are subjected to the regulation of stem cells that maintain the population of cells responsible for the formation of epidermal layers. Stems cells retain their self-renewal property and express biomarkers that are unique to this population. However, differential regulation of the biomarkers can initiate the pathway of terminal cell differentiation. Although, pockets of non-clarity in stem cell maintenance and differentiation in skin still exist, the influence of epigenetics in epidermal stem cell functions and differentiation in skin homeostasis and wound healing is clearly evident. The focus of this review is to discuss the epigenetic regulation of confirmed and probable epidermal stem cell biomarkers in epidermal stratification of normal skin and in diseased states. The role of epigenetics in wound healing, especially in diseased states of diabetes and cancer, will also be conveyed.
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356
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Abstract
The mammalian skin mediates the primary interphase between the body and the external environment and provides the first line of defense against pathogens, mechanical trauma, sunlight injuries, and chemical stress. Proper physical, biochemical, and immunological composition of the skin is necessary to maintain its barrier function. Therefore, the skin reflects a complex dynamic organ with high cellular turnover during normal tissue replacement and wound repair. Stem cell reservoirs ensure constant skin renewal. Wnt signaling controls stem cell maintenance and fate decisions in various tissues and also reflects a key pathway in controlling skin development and homeostasis. Disruption of Wnt signaling in the skin causes disorders such as alopecia, chronic inflammatory skin diseases or cancer. This review summarizes the role of Wnt signaling during skin development, homeostasis, and disease.
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Affiliation(s)
- Iris Augustin
- Division Signaling and Functional Genomics, German Cancer Research Center (DKFZ), Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
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357
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Coelho PA, Bury L, Shahbazi MN, Liakath-Ali K, Tate PH, Wormald S, Hindley CJ, Huch M, Archer J, Skarnes WC, Zernicka-Goetz M, Glover DM. Over-expression of Plk4 induces centrosome amplification, loss of primary cilia and associated tissue hyperplasia in the mouse. Open Biol 2015; 5:150209. [PMID: 26701933 PMCID: PMC4703062 DOI: 10.1098/rsob.150209] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 12/02/2015] [Indexed: 12/28/2022] Open
Abstract
To address the long-known relationship between supernumerary centrosomes and cancer, we have generated a transgenic mouse that permits inducible expression of the master regulator of centriole duplication, Polo-like-kinase-4 (Plk4). Over-expression of Plk4 from this transgene advances the onset of tumour formation that occurs in the absence of the tumour suppressor p53. Plk4 over-expression also leads to hyperproliferation of cells in the pancreas and skin that is enhanced in a p53 null background. Pancreatic islets become enlarged following Plk4 over-expression as a result of equal expansion of α- and β-cells, which exhibit centrosome amplification. Mice overexpressing Plk4 develop grey hair due to a loss of differentiated melanocytes and bald patches of skin associated with a thickening of the epidermis. This reflects an increase in proliferating cells expressing keratin 5 in the basal epidermal layer and the expansion of these cells into suprabasal layers. Such cells also express keratin 6, a marker for hyperplasia. This is paralleled by a decreased expression of later differentiation markers, involucrin, filaggrin and loricrin. Proliferating cells showed an increase in centrosome number and a loss of primary cilia, events that were mirrored in primary cultures of keratinocytes established from these animals. We discuss how repeated duplication of centrioles appears to prevent the formation of basal bodies leading to loss of primary cilia, disruption of signalling and thereby aberrant differentiation of cells within the epidermis. The absence of p53 permits cells with increased centrosomes to continue dividing, thus setting up a neoplastic state of error prone mitoses, a prerequisite for cancer development.
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Affiliation(s)
- Paula A Coelho
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK
| | - Leah Bury
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK
| | - Marta N Shahbazi
- Department of Physiology, Development and Neuroscience, Physiological Laboratory, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Kifayathullah Liakath-Ali
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK Centre for Stem Cells and Regenerative Medicine, King's College London, Floor 28, Tower Wing, Guy's Hospital, Great Maze Pond, London SE1 9RT, UK
| | - Peri H Tate
- Wellcome Trust Genome Campus, the Wellcome Trust Sanger Institute, Cambridge, Hinxton CB10 1SA, UK
| | - Sam Wormald
- Wellcome Trust Genome Campus, the Wellcome Trust Sanger Institute, Cambridge, Hinxton CB10 1SA, UK
| | - Christopher J Hindley
- Henry Wellcome Building of Cancer and Developmental Biology, the Wellcome Trust/Cancer Research UK Gurdon Institute, Tennis Court Road, Cambridge CB2 1QN, UK
| | - Meritxell Huch
- Henry Wellcome Building of Cancer and Developmental Biology, the Wellcome Trust/Cancer Research UK Gurdon Institute, Tennis Court Road, Cambridge CB2 1QN, UK
| | - Joy Archer
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK
| | - William C Skarnes
- Wellcome Trust Genome Campus, the Wellcome Trust Sanger Institute, Cambridge, Hinxton CB10 1SA, UK
| | - Magdalena Zernicka-Goetz
- Department of Physiology, Development and Neuroscience, Physiological Laboratory, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - David M Glover
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK
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358
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Verna C, Sawchuk MG, Linh NM, Scarpella E. Control of vein network topology by auxin transport. BMC Biol 2015; 13:94. [PMID: 26560462 PMCID: PMC4641347 DOI: 10.1186/s12915-015-0208-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 10/28/2015] [Indexed: 02/08/2023] Open
Abstract
Background Tissue networks such as the vascular networks of plant and animal organs transport signals and nutrients in most multicellular organisms. The transport function of tissue networks depends on topological features such as the number of networks’ components and the components’ connectedness; yet what controls tissue network topology is largely unknown, partly because of the difficulties in quantifying the effects of genes on tissue network topology. We address this problem for the vein networks of plant leaves by introducing biologically motivated descriptors of vein network topology; we combine these descriptors with cellular imaging and molecular genetic analysis; and we apply this combination of approaches to leaves of Arabidopsis thaliana that lack function of, overexpress or misexpress combinations of four PIN-FORMED (PIN) genes—PIN1, PIN5, PIN6, and PIN8—which encode transporters of the plant signal auxin and are known to control vein network geometry. Results We find that PIN1 inhibits vein formation and connection, and that PIN6 acts redundantly to PIN1 in these processes; however, the functions of PIN6 in vein formation are nonhomologous to those of PIN1, while the functions of PIN6 in vein connection are homologous to those of PIN1. We further find that PIN8 provides functions redundant and homologous to those of PIN6 in PIN1-dependent inhibition of vein formation, but that PIN8 has no functions in PIN1/PIN6-dependent inhibition of vein connection. Finally, we find that PIN5 promotes vein formation; that all the vein-formation-promoting functions of PIN5 are redundantly inhibited by PIN6 and PIN8; and that these functions of PIN5, PIN6, and PIN8 are independent of PIN1. Conclusions Our results suggest that PIN-mediated auxin transport controls the formation of veins and their connection into networks. Electronic supplementary material The online version of this article (doi:10.1186/s12915-015-0208-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Carla Verna
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada.
| | - Megan G Sawchuk
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada.
| | - Nguyen Manh Linh
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada.
| | - Enrico Scarpella
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada.
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359
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Palazzo E, Morandi P, Lotti R, Saltari A, Truzzi F, Schnebert S, Dumas M, Marconi A, Pincelli C. Notch Cooperates with Survivin to Maintain Stemness and to Stimulate Proliferation in Human Keratinocytes during Ageing. Int J Mol Sci 2015; 16:26291-302. [PMID: 26540052 PMCID: PMC4661807 DOI: 10.3390/ijms161125948] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 10/09/2015] [Accepted: 10/22/2015] [Indexed: 01/01/2023] Open
Abstract
The Notch signaling pathway orchestrates cell fate by either inducing cell differentiation or maintaining cells in an undifferentiated state. This study aims to evaluate Notch expression and function in normal human keratinocytes. Notch1 is expressed in all epidermal layers, though to a different degree of intensity, with a dramatic decrease during ageing. Notch1 intracellular domain (N1ICD) levels are decreased during transit from keratinocyte stem cells (KSC) to transit amplifying (TA) cells, mimicking survivin expression in samples from donors of all ages. Calcium markedly reduces N1ICD levels in keratinocytes. N1ICD overexpression induces the up-regulation of survivin and the down-regulation of keratin 10 and involucrin, while increasing the S phase of the cell cycle. On the other hand, Notch1 inhibition (DAPT) dose-dependently decreases survivin, stimulates differentiation, and reduces keratinocyte proliferation in samples from donors of all ages. Silencing Notch downgrades survivin and increases keratin 10. In addition, Notch1 inhibition decreases survivin levels and proliferation both in KSC and TA cells. Finally, while survivin overexpression decreases keratinocyte differentiation and increases N1ICD expression both in KSC and TA cells, silencing survivin results in N1ICD down-regulation and an increase in differentiation markers. These results suggest that the Notch1/survivin crosstalk contributes to the maintenance of stemness in human keratinocytes.
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Affiliation(s)
- Elisabetta Palazzo
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
| | - Paolo Morandi
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
| | - Roberta Lotti
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
| | - Annalisa Saltari
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
| | - Francesca Truzzi
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
| | | | - Marc Dumas
- LVMH Recherche, 185 Avenue de Verdun, Saint Jean de Braye 45800, France.
| | - Alessandra Marconi
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
| | - Carlo Pincelli
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, via del Pozzo 71, Modena 41121, Italy.
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360
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Sugaya K, Ishihara Y, Inoue S, Hirobe T. The effects of gamma rays on the regeneration of hair follicles are carried over to later hair cycles. Int J Radiat Biol 2015; 91:957-63. [DOI: 10.3109/09553002.2015.1101647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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361
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Geyfman M, Plikus MV, Treffeisen E, Andersen B, Paus R. Resting no more: re-defining telogen, the maintenance stage of the hair growth cycle. Biol Rev Camb Philos Soc 2015; 90:1179-96. [PMID: 25410793 PMCID: PMC4437968 DOI: 10.1111/brv.12151] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 09/12/2014] [Accepted: 10/07/2014] [Indexed: 12/17/2022]
Abstract
The hair follicle (HF) represents a prototypic ectodermal-mesodermal interaction system in which central questions of modern biology can be studied. A unique feature of these stem-cell-rich mini-organs is that they undergo life-long, cyclic transformations between stages of active regeneration (anagen), apoptotic involution (catagen), and relative proliferative quiescence (telogen). Due to the low proliferation rate and small size of the HF during telogen, this stage was conventionally thought of as a stage of dormancy. However, multiple lines of newly emerging evidence show that HFs during telogen are anything but dormant. Here, we emphasize that telogen is a highly energy-efficient default state of the mammalian coat, whose function centres around maintenance of the hair fibre and prompt responses to its loss. While actively retaining hair fibres with minimal energy expenditure, telogen HFs can launch a new regeneration cycle in response to a variety of stimuli originating in their autonomous micro-environment (including its stem cell niche) as well as in their external tissue macro-environment. Regenerative responses of telogen HFs change as a function of time and can be divided into two sub-stages: early 'refractory' and late 'competent' telogen. These changing activities are reflected in hundreds of dynamically regulated genes in telogen skin, possibly aimed at establishing a fast response-signalling environment to trauma and other disturbances of skin homeostasis. Furthermore, telogen is an interpreter of circadian output in the timing of anagen initiation and the key stage during which the subsequent organ regeneration (anagen) is actively prepared by suppressing molecular brakes on hair growth while activating pro-regenerative signals. Thus, telogen may serve as an excellent model system for dissecting signalling and cellular interactions that precede the active 'regenerative mode' of tissue remodeling. This revised understanding of telogen biology also points to intriguing new therapeutic avenues in the management of common human hair growth disorders.
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Affiliation(s)
- Mikhail Geyfman
- Department of Ophthalmology, University of California, Irvine, CA 92697, USA
| | - Maksim V. Plikus
- Department of Developmental and Cell Biology, Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, CA 92697, USA
| | - Elsa Treffeisen
- Department of Dermatology, Kligman Labouratories, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
| | - Bogi Andersen
- Department of Biological Chemistry, University of California Irvine, CA 92697, USA
- Department of Medicine, University of California Irvine, CA 92697, USA
- Institute for Genomics and Bioinformatics, University of California, Irvine, CA 92697, USA
| | - Ralf Paus
- Department of Dermatology, University of Luebeck, Luebeck, Germany
- Institute of Inflammation and Repair, and Dermatology Centre, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PL, UK
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362
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Anderson G, Jenkinson WE. Border control: Anatomical origins of the thymus medulla. Eur J Immunol 2015; 45:2203-7. [PMID: 26109077 PMCID: PMC5102680 DOI: 10.1002/eji.201545829] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 06/16/2015] [Accepted: 06/22/2015] [Indexed: 11/24/2022]
Abstract
The thymus is an anatomically compartmentalized primary lymphoid organ that fosters the production of self‐tolerant T cells. The thymic cortex provides a specialized microenvironment in which cortical thymic epithelial cells (cTECs) support the positive selection and further differentiation of self‐MHC‐restricted thymocytes. Following their migration into the medulla, positively selected thymocytes are further screened for self‐reactivity, which involves both negative selection and Foxp3+ regulatory T cell generation via interactions with medullary thymic epithelial cells (mTECs). Given the importance of both cortical and medullary microenvironments for T cell development, studies that address the developmental origins of cTECs and mTECs are important in understanding the processes that shape the developing T cell receptor repertoire, and reduce the frequency of self‐reactive T cells that initiate autoimmune disease. In this issue of the European Journal of Immunology, Onder et al. [Eur. J. Immunol. 2015. 45: 2218‐2231] identified a subset of podoplanin+ mTECs in mice that reside at the corticomedullary junction (CMJ), show that their development is important to establish self‐tolerance, and require the presence of self‐reactive T cells. Collectively, their findings highlight the CMJ as a potential repository for precursors of the mTEC lineage, and provide a better understanding of thymus medulla formation.
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Affiliation(s)
- Graham Anderson
- MRC Centre for Immune Regulation, Institute for Biomedical Research, Medical School, University of Birmingham, Birmingham, UK
| | - William E Jenkinson
- MRC Centre for Immune Regulation, Institute for Biomedical Research, Medical School, University of Birmingham, Birmingham, UK
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363
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Ojeh N, Pastar I, Tomic-Canic M, Stojadinovic O. Stem Cells in Skin Regeneration, Wound Healing, and Their Clinical Applications. Int J Mol Sci 2015; 16:25476-501. [PMID: 26512657 PMCID: PMC4632811 DOI: 10.3390/ijms161025476] [Citation(s) in RCA: 178] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 10/15/2015] [Accepted: 10/20/2015] [Indexed: 12/18/2022] Open
Abstract
The skin is the largest organ of the body and has an array of functions. Skin compartments, epidermis, and hair follicles house stem cells that are indispensable for skin homeostasis and regeneration. These stem cells also contribute to wound repair, resulting in restoration of tissue integrity and function of damaged tissue. Unsuccessful wound healing processes often lead to non-healing wounds. Chronic wounds are caused by depletion of stem cells and a variety of other cellular and molecular mechanisms, many of which are still poorly understood. Current chronic wound therapies are limited, so the search to develop better therapeutic strategies is ongoing. Adult stem cells are gaining recognition as potential candidates for numerous skin pathologies. In this review, we will discuss epidermal and other stem cells present in the skin, and highlight some of the therapeutic applications of epidermal stem cells and other adult stem cells as tools for cell/scaffold-based therapies for non-healing wounds and other skin disorders. We will also discuss emerging concepts and offer some perspectives on how skin tissue-engineered products can be optimized to provide efficacious therapy in cutaneous repair and regeneration.
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Affiliation(s)
- Nkemcho Ojeh
- Faculty of Medical Sciences, the University of the West Indies, Cave Hill Campus, P.O. Box 64, Bridgetown BB 11000, St. Michael, Barbados; E-Mail:
| | - Irena Pastar
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller Medical School, 1600 NW 10th Avenue, RMSB, Room 2023-A, Miami, FL 33136, USA; E-Mails: (I.P.); (M.T.-C.)
| | - Marjana Tomic-Canic
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller Medical School, 1600 NW 10th Avenue, RMSB, Room 2023-A, Miami, FL 33136, USA; E-Mails: (I.P.); (M.T.-C.)
| | - Olivera Stojadinovic
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller Medical School, 1600 NW 10th Avenue, RMSB, Room 2023-A, Miami, FL 33136, USA; E-Mails: (I.P.); (M.T.-C.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-305-243-7295; Fax: +1-305-243-6191
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364
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The EGFR-HER2 module: a stem cell approach to understanding a prime target and driver of solid tumors. Oncogene 2015; 35:2949-60. [PMID: 26434585 PMCID: PMC4820040 DOI: 10.1038/onc.2015.372] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 08/26/2015] [Accepted: 08/26/2015] [Indexed: 01/26/2023]
Abstract
The epidermal growth factor receptor (EGFR) and a coreceptor denoted HER2/ERBB2 are frequently overexpressed or mutated in solid tumors, such as carcinomas and gliomas. In line with driver roles, cancer drugs intercepting EGFR or HER2 currently outnumber therapies targeting other hubs of signal transduction. To explain the roles for EGFR and HER2 as prime drivers and targets, we take lessons from invertebrates and refer to homeostatic regulation of several mammalian tissues. The model we infer ascribes to the EGFR-HER2 module pivotal functions in rapid clonal expansion of progenitors called transient amplifying cells (TACs). Accordingly, TACs of tumors suffer from replication stress, and hence accumulate mutations. In addition, several lines of evidence propose that in response to EGF and related mitogens, TACs might undergo dedifferentiation into tissue stem cells, which might enable entry of oncogenic mutations into the stem cell compartment. According to this view, antibodies or kinase inhibitors targeting EGFR-HER2 effectively retard some solid tumors because they arrest mutation-enriched TACs and possibly inhibit their dedifferentiation. Deeper understanding of the EGFR-HER2 module and relations between cancer stem cells and TACs will enhance our ability to control a broad spectrum of human malignancies.
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365
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Maquart FX. La matrice extracellulaire : un partenaire majeur de la cicatrisation des plaies. BULLETIN DE L'ACADÉMIE NATIONALE DE MÉDECINE 2015. [DOI: 10.1016/s0001-4079(19)30865-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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366
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367
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Abstract
The mammalian ovary is covered by a single-layered epithelium that undergoes rupture and remodelling following each ovulation. Although resident stem cells are presumed to be crucial for this cyclic regeneration, their identity and mode of action have been elusive. Surrogate stemness assays and in vivo fate-mapping studies using recently discovered stem cell markers have identified stem cell pools in the ovary and fimbria that ensure epithelial homeostasis. Recent findings provide insights into intrinsic mechanisms and local extrinsic cues that govern the function of ovarian and fimbrial stem cells. These discoveries have advanced our understanding of stem cell biology in the ovary and fimbria, and lay the foundations for evaluating the contribution of resident stem cells to the initiation and progression of human epithelial ovarian cancer.
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368
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Pullos AN, Castilho RM, Squarize CH. HPV Infection of the Head and Neck Region and Its Stem Cells. J Dent Res 2015; 94:1532-43. [PMID: 26353884 DOI: 10.1177/0022034515605456] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The human papillomavirus (HPV) is an etiologic agent associated with the development of head and neck squamous carcinoma (HNSCC)-in particular, oropharyngeal squamous cell carcinoma. The HPV-positive HNSCC is characterized by genetic alterations, clinical progression, and therapeutic response, which are distinct from HPV-negative head and neck cancers, suggesting that virus-associated tumors constitute a unique entity among head and neck cancers. Malignant stem cells, or cancer stem cells, are a subpopulation of tumor cells that self-renew, initiate new tumors upon transplantation, and are resistant to therapy, and their discovery has revealed novel effects of oncovirus infection in cancer. In this review, we provide a virus-centric view and novel insights into HPV-positive head and neck pathogenesis. We discuss the influence of cancer stem cells, HPV oncoproteins, altered molecular pathways, and mutations in cancer initiation and cancer progression. We compiled a catalogue of the mutations associated with HPV-positive HNSCC, which may be a useful resource for genomic-based studies aiming to develop personalized therapies. We also explain recent changes in mass vaccination campaigns against HPV and the potential long-term impact of vaccinations on the prevention and treatment of HPV-positive head and neck cancers.
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Affiliation(s)
- A N Pullos
- Laboratory of Epithelial Biology, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - R M Castilho
- Laboratory of Epithelial Biology, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - C H Squarize
- Laboratory of Epithelial Biology, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA University of Michigan Comprehensive Cancer Center, Ann Arbor, MI, USA
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369
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Velarde MC, Demaria M, Melov S, Campisi J. Pleiotropic age-dependent effects of mitochondrial dysfunction on epidermal stem cells. Proc Natl Acad Sci U S A 2015; 112:10407-12. [PMID: 26240345 PMCID: PMC4547253 DOI: 10.1073/pnas.1505675112] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Tissue homeostasis declines with age partly because stem/progenitor cells fail to self-renew or differentiate. Because mitochondrial damage can accelerate aging, we tested the hypothesis that mitochondrial dysfunction impairs stem cell renewal or function. We developed a mouse model, Tg(KRT14-cre/Esr1) (20Efu/J) × Sod2 (tm1Smel) , that generates mitochondrial oxidative stress in keratin 14-expressing epidermal stem/progenitor cells in a temporally controlled manner owing to deletion of Sod2, a nuclear gene that encodes the mitochondrial antioxidant enzyme superoxide dismutase 2 (Sod2). Epidermal Sod2 loss induced cellular senescence, which irreversibly arrested proliferation in a fraction of keratinocytes. Surprisingly, in young mice, Sod2 deficiency accelerated wound closure, increasing epidermal differentiation and reepithelialization, despite the reduced proliferation. In contrast, at older ages, Sod2 deficiency delayed wound closure and reduced epidermal thickness, accompanied by epidermal stem cell exhaustion. In young mice, Sod2 deficiency accelerated epidermal thinning in response to the tumor promoter 12-O-tetradecanoylphorbol-13-acetate, phenocopying the reduced regeneration of older Sod2-deficient skin. Our results show a surprising beneficial effect of mitochondrial dysfunction at young ages, provide a potential mechanism for the decline in epidermal regeneration at older ages, and identify a previously unidentified age-dependent role for mitochondria in skin quality and wound closure.
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Affiliation(s)
| | - Marco Demaria
- Buck Institute for Research on Aging, Novato, CA 94945
| | - Simon Melov
- Buck Institute for Research on Aging, Novato, CA 94945
| | - Judith Campisi
- Buck Institute for Research on Aging, Novato, CA 94945 Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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370
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Götz M, Sirko S, Beckers J, Irmler M. Reactive astrocytes as neural stem or progenitor cells: In vivo lineage, In vitro potential, and Genome-wide expression analysis. Glia 2015; 63:1452-68. [PMID: 25965557 PMCID: PMC5029574 DOI: 10.1002/glia.22850] [Citation(s) in RCA: 159] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 04/01/2015] [Accepted: 04/15/2015] [Indexed: 12/25/2022]
Abstract
Here, we review the stem cell hallmarks of endogenous neural stem cells (NSCs) during development and in some niches of the adult mammalian brain to then compare these with reactive astrocytes acquiring stem cell hallmarks after traumatic and ischemic brain injury. Notably, even endogenous NSCs including the earliest NSCs, the neuroepithelial cells, generate in most cases only a single type of progeny and self‐renew only for a rather short time in vivo. In vitro, however, especially cells cultured under neurosphere conditions reveal a larger potential and long‐term self‐renewal under the influence of growth factors. This is rather well comparable to reactive astrocytes in the traumatic or ischemic brain some of which acquire neurosphere‐forming capacity including multipotency and long‐term self‐renewal in vitro, while they remain within their astrocyte lineage in vivo. Both reactive astrocytes and endogenous NSCs exhibit stem cell hallmarks largely in vitro, but their lineage differs in vivo. Both populations generate largely a single cell type in vivo, but endogenous NSCs generate neurons and reactive astrocytes remain in the astrocyte lineage. However, at some early postnatal stages or in some brain regions reactive astrocytes can be released from this fate restriction, demonstrating that they can also enact neurogenesis. Thus, reactive astrocytes and NSCs share many characteristic hallmarks, but also exhibit key differences. This conclusion is further substantiated by genome‐wide expression analysis comparing NSCs at different stages with astrocytes from the intact and injured brain parenchyma. GLIA 2015;63:1452–1468
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Affiliation(s)
- Magdalena Götz
- Physiological Genomics, Biomedical Center, Ludwig-Maximilians-University Munich, Munich, Germany.,Institute of Stem Cell Research, Helmholtz Center Munich, Munich, Germany.,SYNERGY, Excellence Cluster of Systemic Neurology, LMU, Munich, Germany
| | - Swetlana Sirko
- Physiological Genomics, Biomedical Center, Ludwig-Maximilians-University Munich, Munich, Germany.,Institute of Stem Cell Research, Helmholtz Center Munich, Munich, Germany
| | - Johannes Beckers
- Institute of Experimental Genetics, Helmholtz Center Munich, Munich, Germany.,Department of Experimental Genetics, Technical University Munich, Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Martin Irmler
- Institute of Experimental Genetics, Helmholtz Center Munich, Munich, Germany
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371
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Exploring the biology of the nail: An intriguing but less-investigated skin appendage. J Dermatol Sci 2015; 79:187-93. [PMID: 25999148 DOI: 10.1016/j.jdermsci.2015.04.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 04/25/2015] [Accepted: 04/28/2015] [Indexed: 02/04/2023]
Abstract
The nail is a highly keratinized structure covering the tip of the digit, and considered to have several important functions in our daily life. In recent years, as biological aspects of the nail organ have been characterized, we realize that the nail unit and the hair follicle share various biological and immunological features. In particular, development and homeostasis of the nail unit also requires intimate epithelial-mesenchymal interactions that involve signaling pathways such as Wnt. There is also a striking immunological resemblance between both appendages, since the nail matrix, like the anagen hair bulb and the bulge, was shown to present unique characteristics of an immune privileged site. On the other hand, considerable progress in identifying nail stem cells has succeeded in locating putative stem cell niches in the nail unit. In this context, it is intriguing that nail stem cells residing in the nail matrix were recently shown to possess the ability to organize the process leading to digit regeneration. Further elucidation of signaling pathways governing epithelial-mesenchymal interactions in the nail unit seems to be a key to develop a novel therapeutic tool to treat amputees using nail epithelium. However, it is at least certain that the nail unit has a promising potential for the future of regenerative medicine. This review explores the biology of the nail organ by focusing on intriguing knowledge gained from recent studies.
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372
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Nelson DA, Larsen M. Heterotypic control of basement membrane dynamics during branching morphogenesis. Dev Biol 2015; 401:103-9. [PMID: 25527075 PMCID: PMC4465071 DOI: 10.1016/j.ydbio.2014.12.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 11/24/2014] [Accepted: 12/09/2014] [Indexed: 02/06/2023]
Abstract
Many mammalian organs undergo branching morphogenesis to create highly arborized structures with maximized surface area for specialized organ function. Cooperative cell-cell and cell-matrix adhesions that sculpt the emerging tissue architecture are guided by dynamic basement membranes. Properties of the basement membrane are reciprocally controlled by the interacting epithelial and mesenchymal cell populations. Here we discuss how basement membrane remodeling is required for branching morphogenesis to regulate cell-matrix and cell-cell adhesions that are required for cell patterning during morphogenesis and how basement membrane impacts morphogenesis by stimulation of cell patterning, force generation, and mechanotransduction. We suggest that in addition to creating mature epithelial architecture, remodeling of the epithelial basement membrane during branching morphogenesis is also essential to promote maturation of the stromal mesenchyme to create mature organ structure. Recapitulation of developmental cell-matrix and cell-cell interactions are of critical importance in tissue engineering and regeneration strategies that seek to restore organ function.
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Affiliation(s)
- Deirdre A Nelson
- Department of Biological Sciences, University at Albany, State University of New York, 1400 Washington Avenue, 1400 Washington Ave, Albany, NY 12222, USA
| | - Melinda Larsen
- Department of Biological Sciences, University at Albany, State University of New York, 1400 Washington Avenue, 1400 Washington Ave, Albany, NY 12222, USA.
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373
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Ramirez K, Witherden DA, Havran WL. All hands on DE(T)C: Epithelial-resident γδ T cells respond to tissue injury. Cell Immunol 2015; 296:57-61. [PMID: 25958272 DOI: 10.1016/j.cellimm.2015.04.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Revised: 03/27/2015] [Accepted: 04/19/2015] [Indexed: 12/29/2022]
Abstract
Immunology has traditionally focused on the lymphocytes circulating among primary lymphoid organs while the large reservoir of tissue-resident T cells have received relatively less attention. In epithelia, these populations are comprised of significant, and sometimes exclusive, subsets of γδ T cells that are highly specialized in promoting tissue homeostasis. As the epithelial layers of the skin and gut are permanently exposed to the environment, they are continually subject to injury and therefore require highly efficient repair processes to maintain barrier functions. Here, we review the role of γδ T cells in promoting wound healing, a critical and complex process occurring in the skin and other barrier sites.
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Affiliation(s)
- Kevin Ramirez
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, USA
| | - Deborah A Witherden
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, USA
| | - Wendy L Havran
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, USA.
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374
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Cruz IA, Kappedal R, Mackenzie SM, Hailey DW, Hoffman TL, Schilling TF, Raible DW. Robust regeneration of adult zebrafish lateral line hair cells reflects continued precursor pool maintenance. Dev Biol 2015; 402:229-38. [PMID: 25869855 DOI: 10.1016/j.ydbio.2015.03.019] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 03/03/2015] [Accepted: 03/27/2015] [Indexed: 01/08/2023]
Abstract
We have examined lateral line hair cell and support cell maintenance in adult zebrafish when growth is largely complete. We demonstrate that adult zebrafish not only replenish hair cells after a single instance of hair cell damage, but also maintain hair cells and support cells after multiple rounds of damage and regeneration. We find that hair cells undergo continuous turnover in adult zebrafish in the absence of damage. We identify mitotically-distinct support cell populations and show that hair cells regenerate from underlying support cells in a region-specific manner. Our results demonstrate that there are two distinct support cell populations in the lateral line, which may help explain why zebrafish hair cell regeneration is extremely robust, retained throughout life, and potentially unlimited in regenerative capacity.
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Affiliation(s)
- Ivan A Cruz
- Molecular Cellular Biology Graduate Program, University of Washington, Seattle, WA 98195, USA; Department of Biological Structure, University of Washington, Seattle, WA 98195, USA
| | - Ryan Kappedal
- Department of Statistics, University of Washington, Seattle, WA 98195, USA
| | - Scott M Mackenzie
- Department of Biological Structure, University of Washington, Seattle, WA 98195, USA; Neurobiology and Behavior Graduate Program, University of Washington, Seattle, WA 98195, USA
| | - Dale W Hailey
- Department of Biological Structure, University of Washington, Seattle, WA 98195, USA
| | - Trevor L Hoffman
- Department of Developmental and Cell Biology, University of California, Irvine, CA 92697-2300, USA; Kaiser Permanente, 5971 Venice Boulevard, West Los Angeles, CA 90034, USA
| | - Thomas F Schilling
- Department of Developmental and Cell Biology, University of California, Irvine, CA 92697-2300, USA
| | - David W Raible
- Molecular Cellular Biology Graduate Program, University of Washington, Seattle, WA 98195, USA; Department of Biological Structure, University of Washington, Seattle, WA 98195, USA; Neurobiology and Behavior Graduate Program, University of Washington, Seattle, WA 98195, USA.
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375
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Wu YF, Wang SH, Wu PS, Fan SMY, Chiu HY, Tsai TH, Lin SJ. Enhancing hair follicle regeneration by nonablative fractional laser: Assessment of irradiation parameters and tissue response. Lasers Surg Med 2015; 47:331-41. [DOI: 10.1002/lsm.22330] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Revised: 12/01/2014] [Accepted: 12/01/2014] [Indexed: 02/02/2023]
Affiliation(s)
- Yueh-Feng Wu
- Institute of Biomedical Engineering; College of Medicine and College of Engineering; National Taiwan University; Taipei Taiwan
| | - Shiou-Han Wang
- Department of Dermatology; National Taiwan University Hospital and College of Medicine; Taipei Taiwan
| | - Pei-Shan Wu
- Institute of Biomedical Engineering; College of Medicine and College of Engineering; National Taiwan University; Taipei Taiwan
| | - Sabrina Mai-Yi Fan
- Institute of Biomedical Engineering; College of Medicine and College of Engineering; National Taiwan University; Taipei Taiwan
| | - Hsien-Yi Chiu
- Institute of Biomedical Engineering; College of Medicine and College of Engineering; National Taiwan University; Taipei Taiwan
- Department of Dermatology; National Taiwan University Hospital and College of Medicine; Taipei Taiwan
- Department of Dermatology; Hsin-Chu Branch; National Taiwan University Hospital; Hsin-Chu City Taiwan
| | - Tsung-Hua Tsai
- Department Dermatology; Cathay General Hospital; Taipei Taiwan
| | - Sung-Jan Lin
- Institute of Biomedical Engineering; College of Medicine and College of Engineering; National Taiwan University; Taipei Taiwan
- Department of Dermatology; National Taiwan University Hospital and College of Medicine; Taipei Taiwan
- Research Center for Developmental Biology and Regenerative Medicine; National Taiwan University; Taipei Taiwan
- Center for Molecular Imaging; National Taiwan University; Taipei Taiwan
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376
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Augustin I. Wnt-Signalwege bei kutaner Homöostase und Pathologie. J Dtsch Dermatol Ges 2015. [DOI: 10.1111/ddg.12620_suppl] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Iris Augustin
- Abteilung Signalwege und funktionelle Genomik, Deutsches Krebsforschungszentrum (DKFZ), Lehrstuhl für Zell- und Molekularbiologie, Medizinische Fakultät Mannheim, Universität Heidelberg, Heidelberg, Deutschland
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377
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Plikus MV, Van Spyk EN, Pham K, Geyfman M, Kumar V, Takahashi JS, Andersen B. The circadian clock in skin: implications for adult stem cells, tissue regeneration, cancer, aging, and immunity. J Biol Rhythms 2015; 30:163-82. [PMID: 25589491 DOI: 10.1177/0748730414563537] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Historically, work on peripheral circadian clocks has been focused on organs and tissues that have prominent metabolic functions, such as the liver, fat, and muscle. In recent years, skin has emerged as a model for studying circadian clock regulation of cell proliferation, stem cell functions, tissue regeneration, aging, and carcinogenesis. Morphologically, skin is complex, containing multiple cell types and structures, and there is evidence for a functional circadian clock in most, if not all, of its cell types. Despite the complexity, skin stem cell populations are well defined, experimentally tractable, and exhibit prominent daily cell proliferation cycles. Hair follicle stem cells also participate in recurrent, long-lasting cycles of regeneration: the hair growth cycles. Among other advantages of skin is a broad repertoire of available genetic tools enabling the creation of cell type-specific circadian mutants. Also, due to the accessibility of skin, in vivo imaging techniques can be readily applied to study the circadian clock and its outputs in real time, even at the single-cell level. Skin provides the first line of defense against many environmental and stress factors that exhibit dramatic diurnal variations such as solar ultraviolet (UV) radiation and temperature. Studies have already linked the circadian clock to the control of UVB-induced DNA damage and skin cancers. Due to the important role that skin plays in the defense against microorganisms, it also represents a promising model system to further explore the role of the clock in the regulation of the body's immune functions. To that end, recent studies have already linked the circadian clock to psoriasis, one of the most common immune-mediated skin disorders. Skin also provides opportunities to interrogate the clock regulation of tissue metabolism in the context of stem cells and regeneration. Furthermore, many animal species feature prominent seasonal hair molt cycles, offering an attractive model for investigating the role of the clock in seasonal organismal behaviors.
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Affiliation(s)
- Maksim V Plikus
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA Center for Complex Biological Systems, University of California, Irvine, Irvine, CA
| | - Elyse N Van Spyk
- Center for Complex Biological Systems, University of California, Irvine, Irvine, CA Department of Biological Chemistry, University of California, Irvine, Irvine, CA Division of Endocrinology, Department of Medicine, University of California, Irvine, Irvine, CA
| | - Kim Pham
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | | | - Vivek Kumar
- Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Joseph S Takahashi
- Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Bogi Andersen
- Center for Complex Biological Systems, University of California, Irvine, Irvine, CA Department of Biological Chemistry, University of California, Irvine, Irvine, CA Division of Endocrinology, Department of Medicine, University of California, Irvine, Irvine, CA
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378
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Kato H, Lo A, Kuo S, Nie S, Marcelo CL, Lubman DM, Feinberg SE. Proteomics Characterization of Primary Human Oral Epithelial Cells Using a Novel Culture Technique for Use in Tissue Regeneration. MOJ PROTEOMICS & BIOINFORMATICS 2015; 2. [PMID: 27042699 DOI: 10.15406/mojpb.2015.02.00052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Oral mucosa keratinocytes are widely used in regenerative medicine. The unique cultured cell population "Epithelial-derived Pop-Up Keratinocytes (ePUKs)" was previously reported as undifferentiated cells. Gravity Assisted Cell Sorting (GACS) was used to isolate a small-sized population of undifferentiated cells enriched ePUKs. LC/MS/MS analysis was performed to define the cellular profile of ePUKs of primary human oral mucosa keratinocytes. Small sized ePUKs which showed increased expression of Dickkopf WNT signaling pathway inhibitor 1 (DKK1), serpin peptidase inhibitor, clade E (nexin, plasminogen activator inhibitor type 1), member 1 (SERPINE1), follistatin and tenascin-C were verified by Western blots. These proteins are involved in the regulation of cellular movement, hair follicle development and the maintenance of its stem cell niche. The fabrication of a tissue-engineered oral mucosa, ex vivo produced oral mucosa equivalent (EVPOME), using ePUKs showed increased abundance of these verified proteins. These findings indicate that the specific phenotype of ePUKs and their ability to influence wound healing promotion are implicated by highly expressed cellular movement regulatory proteins. Therefore, ePUKs may be a useful cell source for use in regenerative medicine.
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Affiliation(s)
- Hiroko Kato
- Department of Oral and Maxillofacial Surgery, University of Michigan, USA; Department of Biomimetics, Niigata University Postgraduate School of Medical and Dental Sciences, Japan
| | - Andy Lo
- Department of Surgery, University of Michigan Medical Center, USA
| | - Shiuhyang Kuo
- Department of Oral and Maxillofacial Surgery, University of Michigan, USA
| | - Song Nie
- Department of Surgery, University of Michigan Medical Center, USA
| | - Cynthia L Marcelo
- Department of Oral and Maxillofacial Surgery, University of Michigan, USA
| | - David M Lubman
- Department of Surgery, University of Michigan Medical Center, USA
| | - Stephen E Feinberg
- Department of Oral and Maxillofacial Surgery, University of Michigan, USA
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379
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Cretoiu SM, Popescu LM. Telocytes revisited. Biomol Concepts 2014; 5:353-69. [DOI: 10.1515/bmc-2014-0029] [Citation(s) in RCA: 187] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 09/03/2014] [Indexed: 12/12/2022] Open
Abstract
AbstractTelocytes (TCs) are a novel interstitial (stromal) cell type described in many tissues and organs (www.telocytes.com). A TC is characterized by a small cell body (9–15 μm) and a variable number (one to five) of extremely long and thin telopodes (Tps), with alternating regions of podomers (∼80 nm) and podoms (250–300 nm). Tps are interconnected by homo- and heterocellular junctions and form three-dimensional networks. Moreover, Tps release three types of extracellular vesicles: exosomes, ectosomes, and multivesicular cargos, which are involved in paracrine signaling. Different techniques have been used to characterize TCs, from classical methods (light microscopy, electron microscopy) to modern ‘omics’. It is considered that electron microscopy is essential for their identification, and CD34/PDGFRα double immunohistochemistry can orientate the diagnosis. Functional evidence is accumulating that TCs may be intimately involved in the maintenance of tissue homeostasis and renewal by short- and long-distance intercellular communication. This review focuses on the most recent findings regarding TC features and locations and the principal hypotheses about their functions in normal and diseased organs. TC involvement in regenerative medicine is also considered.
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