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Okamura DM, Nguyen ED, Collins SJ, Yoon K, Gere JB, Weiser-Evans MCM, Beier DR, Majesky MW. Mammalian organ regeneration in spiny mice. J Muscle Res Cell Motil 2023; 44:39-52. [PMID: 36131170 DOI: 10.1007/s10974-022-09631-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 08/30/2022] [Indexed: 11/26/2022]
Abstract
Fibrosis-driven solid organ failure is a major world-wide health burden with few therapeutic options. Spiny mice (genus: Acomys) are terrestrial mammals that regenerate severe skin wounds without fibrotic scars to evade predators. Recent studies have shown that spiny mice also regenerate acute ischemic and traumatic injuries to kidney, heart, spinal cord, and skeletal muscle. A common feature of this evolved wound healing response is a lack of formation of fibrotic scar tissue that degrades organ function, inhibits regeneration, and leads to organ failure. Complex tissue regeneration is an extremely rare property among mammalian species. In this article, we discuss the evidence that Acomys represents an emerging model organism that offers a unique opportunity for the biomedical community to investigate and clinically translate molecular mechanisms of scarless wound healing and regeneration of organ function in a mammalian species.
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Affiliation(s)
- Daryl M Okamura
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA
- Department of Pediatrics, University of Washington, Seattle, WA, 98195, USA
| | - Elizabeth D Nguyen
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA
- Department of Pediatrics, University of Washington, Seattle, WA, 98195, USA
| | - Sarah J Collins
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA
| | - Kevin Yoon
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA
| | - Joshua B Gere
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA
| | - Mary C M Weiser-Evans
- Department of Medicine, Division of Renal Diseases & Hypertension, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - David R Beier
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA
- Department of Pediatrics, University of Washington, Seattle, WA, 98195, USA
| | - Mark W Majesky
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, 1900 Ninth Avenue, M/S C9S-5, Seattle, WA, 98101, USA.
- Department of Pediatrics, University of Washington, Seattle, WA, 98195, USA.
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, WA, 98195, USA.
- Institute for Stem Cell & Regenerative Medicine, University of Washington, Seattle, WA, 98195, USA.
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2
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Castilla-Ibeas A, Zdral S, Galán L, Haro E, Allou L, Campa VM, Icardo JM, Mundlos S, Oberg KC, Ros MA. Failure of digit tip regeneration in the absence of Lmx1b suggests Lmx1b functions disparate from dorsoventral polarity. Cell Rep 2023; 42:111975. [PMID: 36641754 DOI: 10.1016/j.celrep.2022.111975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 11/07/2022] [Accepted: 12/22/2022] [Indexed: 01/15/2023] Open
Abstract
Mammalian digit tip regeneration is linked to the presence of nail tissue, but a nail-explicit model is missing. Here, we report that nail-less double-ventral digits of ΔLARM1/2 mutants that lack limb-specific Lmx1b enhancers fail to regenerate. To separate the nail's effect from the lack of dorsoventral (DV) polarity, we also interrogate double-dorsal double-nail digits and show that they regenerate. Thus, DV polarity is not a prerequisite for regeneration, and the nail requirement is supported. Transcriptomic comparison between wild-type and non-regenerative ΔLARM1/2 mutant blastemas reveals differential upregulation of vascularization and connective tissue functional signatures in wild type versus upregulation of inflammation in the mutant. These results, together with the finding of Lmx1b expression in the postnatal dorsal dermis underneath the nail and uniformly in the regenerative blastema, open the possibility of additional Lmx1b roles in digit tip regeneration, in addition to the indirect effect of mediating the formation of the nail.
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Affiliation(s)
- Alejandro Castilla-Ibeas
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC; CSIC-SODERCAN-UC), Santander, Spain
| | - Sofía Zdral
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC; CSIC-SODERCAN-UC), Santander, Spain
| | - Laura Galán
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC; CSIC-SODERCAN-UC), Santander, Spain
| | - Endika Haro
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC; CSIC-SODERCAN-UC), Santander, Spain
| | - Lila Allou
- RG Development & Disease, Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Víctor M Campa
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC; CSIC-SODERCAN-UC), Santander, Spain
| | - Jose M Icardo
- Departamento de Anatomía y Biología Celular, Universidad de Cantabria, Santander, Spain
| | - Stefan Mundlos
- RG Development & Disease, Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Kerby C Oberg
- Department of Pathology and Human Anatomy, School of Medicine, Loma Linda University, Loma Linda, CA, USA
| | - Marian A Ros
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC; CSIC-SODERCAN-UC), Santander, Spain.
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3
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The Potential of Nail Mini-Organ Stem Cells in Skin, Nail and Digit Tips Regeneration. Int J Mol Sci 2021; 22:ijms22062864. [PMID: 33799809 PMCID: PMC7998429 DOI: 10.3390/ijms22062864] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/08/2021] [Accepted: 03/08/2021] [Indexed: 12/17/2022] Open
Abstract
Nails are highly keratinized skin appendages that exhibit continuous growth under physiological conditions and full regeneration upon removal. These mini-organs are maintained by two autonomous populations of skin stem cells. The fast-cycling, highly proliferative stem cells of the nail matrix (nail stem cells (NSCs)) predominantly replenish the nail plate. Furthermore, the slow-cycling population of the nail proximal fold (nail proximal fold stem cells (NPFSCs)) displays bifunctional properties by contributing to the peri-nail epidermis under the normal homeostasis and the nail structure upon injury. Here, we discuss nail mini-organ stem cells’ location and their role in skin and nail homeostasis and regeneration, emphasizing their importance to orchestrate the whole digit tip regeneration. Such endogenous regeneration capabilities are observed in rodents and primates. However, they are limited to the region adjacent to the nail’s proximal area, indicating the crucial role of nail mini-organ stem cells in digit restoration. Further, we explore the molecular characteristics of nail mini-organ stem cells and the critical role of the bone morphogenetic protein (BMP) and Wnt signaling pathways in homeostatic nail growth and digit restoration. Finally, we investigate the latest accomplishments in stimulating regenerative responses in regeneration-incompetent injuries. These pioneer results might open up new opportunities to overcome amputated mammalian digits and limbs’ regenerative failures in the future.
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4
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Storer MA, Miller FD. Cellular and molecular mechanisms that regulate mammalian digit tip regeneration. Open Biol 2020; 10:200194. [PMID: 32993414 PMCID: PMC7536070 DOI: 10.1098/rsob.200194] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Digit tip regeneration is one of the few examples of true multi-tissue regeneration in an adult mammal. The key step in this process is the formation of the blastema, a transient proliferating cell mass that generates the different cell types of the digit to replicate the original structure. Failure to form the blastema results in a lack of regeneration and has been postulated to be the reason why mammalian limbs cannot regrow following amputation. Understanding how the blastema forms and functions will help us to determine what is required for mammalian regeneration to occur and will provide insights into potential therapies for mammalian tissue regeneration and repair. This review summarizes the cellular and molecular mechanisms that influence murine blastema formation and govern digit tip regeneration.
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Affiliation(s)
- Mekayla A Storer
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada M5G 1L7
| | - Freda D Miller
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada M5G 1L7.,Department of Molecular Genetics, University of Toronto, Toronto, Canada M5G 1A8.,Department of Physiology, University of Toronto, Toronto, Canada M5G 1A8.,Institute of Medical Sciences, University of Toronto, Toronto, Canada M5G 1A8
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5
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Bothe V, Mahlow K, Fröbisch NB. A histological study of normal and pathological limb regeneration in the Mexican axolotl Ambystoma mexicanum. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2020; 336:116-128. [PMID: 32394624 DOI: 10.1002/jez.b.22950] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 03/30/2020] [Accepted: 04/08/2020] [Indexed: 01/13/2023]
Abstract
Salamanders show unparalleled capacities of tissue regeneration amongst tetrapods (four-legged vertebrates), being able to repair and renew lost or damage body parts, such as tails, jaws, and limbs in a seemingly perfect fashion. Despite countless studies on axolotl (Ambystoma mexicanum) regeneration, only a few studies have thus far compared gross morphological and histological features of the original and regenerated limb skeleton. Therein, most studies have focused on nerves or muscles, while even fewer have provided detailed information about bones and cartilage. This study compares skeletal tissue structures of original and regenerated limbs with respect to tissue level histology. Histological serial sections of 55 axolotl larvae were generated, including 29 limbs that were severed by conspecifics, and 26 that were subject to targeted amputations. Amputations were executed in several larval stages (48, 52, and 53) and at different limb positions (humeral midshaft, above the mesopod). In addition, 3D reconstructions were prepared based on X-ray microtomography scans. The results demonstrate that regenerated forelimbs show a diversity of limb and digit abnormalities as a result of imperfect regeneration. Furthermore, abnormalities were more severe and more frequent in regenerated forelimbs caused by natural bites as compared with regenerated forelimbs after amputation. The results indicate that abnormalities occur frequently after regeneration in larval axolotls contradicting the notion of regeneration generally resulting in perfect limbs.
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Affiliation(s)
- Vivien Bothe
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
| | - Kristin Mahlow
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
| | - Nadia B Fröbisch
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany.,Humboldt-Universität zu Berlin, Berlin, Germany
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Hughes MW, Jiang TX, Plikus MV, Guerrero-Juarez CF, Lin CH, Schafer C, Maxson R, Widelitz RB, Chuong CM. Msx2 Supports Epidermal Competency during Wound-Induced Hair Follicle Neogenesis. J Invest Dermatol 2018; 138:2041-2050. [PMID: 29577917 PMCID: PMC6109435 DOI: 10.1016/j.jid.2018.02.043] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 02/06/2018] [Accepted: 02/10/2018] [Indexed: 12/11/2022]
Abstract
Cutaneous wounds in adult mammals typically heal by scarring. However, large full-thickness wounds undergo wound-induced hair follicle neogenesis (WIHN), a form of regeneration. Here, we show that WIHN requires transient expression of epidermal Msx2 in two phases: the wound margin early and the wound center late. Msx2 expression is present in the migrating epithelium during early wound healing and then presents in the epithelium and mesenchyme later in the wound center. WIHN is abrogated in germline and epithelial-specific Msx2 mutant mice. Unlike the full-length Msx2 promoter, a minimal Msx2 promoter fails activation in the wound center, suggesting complex regulation of Msx2 expression. The Msx2 promoter binding sites include Tcf/Lef, Jun/Creb, Pax3, and three SMAD sites. However, basal epithelial-induced BMP suppression by noggin overexpression did not affect WIHN. We propose that Msx2 signaling is required for the epidermis to acquire spatiotemporal competence during WIHN. Topologically, hair regeneration dominates in the wound center, coinciding with late Msx2 expression. Together, these results suggest that intrinsic Msx2 expression supports epithelial competency during hair follicle neogenesis. This work provides insight into endogenous mechanisms modulating competency of adult epidermal progenitors for mammalian ectodermal appendage neogenesis, and offers the target Msx2 for future regeneration-promoting therapies.
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Affiliation(s)
- Michael W Hughes
- Department of Pathology, School of Medicine, University of Southern California, Los Angeles, California, USA; International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Institute of Clinical Medicine, National Cheng Kung University Hospital, Tainan, Taiwan
| | - Ting-Xin Jiang
- Department of Pathology, School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Maksim V Plikus
- Department of Developmental and Cell Biology, School of Biological Sciences, University of California Irvine, Irvine, California, USA; Stem Cell Research Center, Center for Complex Biological Systems, University of California Irvine, Irvine, California, USA
| | - Christian Fernando Guerrero-Juarez
- Department of Developmental and Cell Biology, School of Biological Sciences, University of California Irvine, Irvine, California, USA; Stem Cell Research Center, Center for Complex Biological Systems, University of California Irvine, Irvine, California, USA
| | - Chien-Hong Lin
- International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Department of Basic Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan
| | - Christopher Schafer
- Department of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Robert Maxson
- Department of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Randall B Widelitz
- Department of Pathology, School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Cheng-Ming Chuong
- Department of Pathology, School of Medicine, University of Southern California, Los Angeles, California, USA; International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Institute of Clinical Medicine, National Cheng Kung University Hospital, Tainan, Taiwan; Department of Basic Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan; Integrative Stem Cell Center, China Medical University Hospital, China Medical University, 2 Yude Road, North District, Taichung, Taiwan.
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7
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Hsu CK, Lin HH, Harn HIC, Hughes MW, Tang MJ, Yang CC. Mechanical forces in skin disorders. J Dermatol Sci 2018; 90:232-240. [PMID: 29567352 DOI: 10.1016/j.jdermsci.2018.03.004] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 03/05/2018] [Indexed: 01/08/2023]
Abstract
Mechanical forces are known to regulate homeostasis of the skin and play a role in the pathogenesis of skin diseases. The epidermis consists of keratinocytes that are tightly adhered to each other by cell junctions. Defects in keratins or desmosomal/hemidesmosomal proteins lead to the attenuation of mechanical strength and formation of intraepidermal blisters in the case of epidermolysis bullosa simplex. The dermis is rich in extracellular matrix, especially collagen, and provides the majority of tensile force in the skin. Keloid and hypertrophic scar, which is the result of over-production of collagen by fibroblasts during the wound healing, are associated with extrinsic tensile forces and changes of intrinsic mechanical properties of the cell. Increasing evidences shows that stiffness of the skin environment determines the regenerative ability during wound healing process. Mechanotransduction pathways are also involved in the morphogenesis and cyclic growth of hair follicles. The development of androgenetic alopecia is correlated to tensile forces generated by the fibrous tissue underlying the scalp. Acral melanoma predominantly occurs in the weight-bearing area of the foot suggesting the role of mechanical stress. Increased dermal stiffness from fibrosis might be the cause of recessive dystrophic epidermolysis bullosa associated squamous cell carcinoma. Strategies to change the mechanical forces or modify the mechanotransduction signals may lead to a new way to treat skin diseases and promote skin regeneration.
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Affiliation(s)
- Chao-Kai Hsu
- Department of Dermatology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; International Research Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan
| | - Hsi-Hui Lin
- International Research Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Hans I-Chen Harn
- International Research Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Michael W Hughes
- International Research Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ming-Jer Tang
- International Research Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan; Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chao-Chun Yang
- Department of Dermatology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; International Research Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan.
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8
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Taghiyar L, Hosseini S, Hesaraki M, Azam Sayahpour F, Aghdami N, Baghaban Eslaminejad M. Isolation, Characterization and Osteogenic Potential of Mouse Digit Tip Blastema Cells in Comparison with Bone Marrow-Derived Mesenchymal Stem Cells In Vitro. CELL JOURNAL 2017; 19:585-598. [PMID: 29105393 PMCID: PMC5672097 DOI: 10.22074/cellj.2018.4710] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Accepted: 11/02/2016] [Indexed: 12/20/2022]
Abstract
Objective Limb regeneration mediated by blastema cells (BlCs) in mammals is limited to the digit tips of neonates.
Due to the lack of access to BlCs in adults and the difficulty in isolating and expanding BlCs from neonates, the use
of a cellular population with similar features of BlCs would be a valuable strategy to direct a non-regenerative wound
towards regeneration. In this study, we have initially isolated and cultured BlCs, and explored their characteristics in
vitro. Next, we compared the capability of bone marrow-derived mesenchymal stem cells (BM-MSCs) as an alternative
accessible cell source to BlCs for regeneration of appendages.
Materials and Methods In this experimental study, BM-MSCs were isolated from BM and we obtained BlCs from the
neonatal regenerating digit tip of C57B/6 mice. The cells were characterized for expressions of cell surface markers by
flow cytometry. Quantitative-reverse transcription polymerase chain reaction (qRT-PCR) and lineage-specific staining
were used to assess their ability to differentiate into skeletal cell lineages. The colony forming ability, proliferation,
alkaline phosphatase (ALP) activity, calcium content, and osteogenic gene expression were evaluated in both BM-
MSCs and BlCs cultures at days 7, 14, and 21.
Results qRT-PCR analysis revealed that the cells from both sources readily differentiated into mesodermal lineages. There
was significantly higher colony forming ability in BM-MSCs compared to BlCs (P<0.05). Alizarin red staining (ARS), calcium,
and the ALP assay showed the same degree of mineral deposition in both BlCs and BM-MSCs. Gene expression levels of
osteblastic markers indicated similar bone differentiation capacity for both BlCs and BM-MSCs at all time-points.
Conclusion Characteristics of BlCs in vitro appear to be similar to BM-MSCs. Therefore, they could be considered as a
substitute for BlCs for a regenerative approach with potential use in future clinical settings for regenerating human appendages.
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Affiliation(s)
- Leila Taghiyar
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran.,Department of Developmental Biology, University of Science and Culture, Tehran, Iran
| | - Samaneh Hosseini
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Mahdi Hesaraki
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Forough Azam Sayahpour
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Nasser Aghdami
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Mohamadreza Baghaban Eslaminejad
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran.
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Marrero L, Simkin J, Sammarco M, Muneoka K. Fibroblast reticular cells engineer a blastema extracellular network during digit tip regeneration in mice. ACTA ACUST UNITED AC 2017; 4:69-84. [PMID: 28616246 PMCID: PMC5469731 DOI: 10.1002/reg2.75] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 01/27/2017] [Accepted: 02/24/2017] [Indexed: 12/11/2022]
Abstract
The regeneration blastema which forms following amputation of the mouse digit tip is composed of undifferentiated cells bound together by an organized network of fibers. A monoclonal antibody (ER‐TR7) that identifies extracellular matrix (ECM) fibers produced by fibroblast reticular cells during lymphoid organogenesis was used to characterize the ECM of the digit, the blastema, and the regenerate. Digit fibroblast reticular cells produce an ER‐TR7+ ECM network associated with different tissues and represent a subset of loose connective tissue fibroblasts. During blastema formation there is an upregulation of matrix production that returns to its pre‐existing level and anatomical pattern in the endpoint regenerate. Co‐localization studies demonstrate a strong spatial correlation between the ER‐TR7 antigen and collagen type III (COL3) in histological sections. ER‐TR7 and COL3 are co‐induced in cultured digit fibroblasts following treatment with tumor necrosis factor alpha and a lymphotoxin beta receptor agonist. These results provide an initial characterization of the ECM during digit regeneration and identify a subpopulation of fibroblasts involved in producing the blastema provisional matrix that is remodeled during the regeneration response.
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Affiliation(s)
- Luis Marrero
- Department of Cell and Molecular Biology Tulane University New Orleans LA 70118 USA.,Department of Medicine Louisiana State University Health Sciences Center New Orleans LA 70112 USA
| | - Jennifer Simkin
- Department of Cell and Molecular Biology Tulane University New Orleans LA 70118 USA
| | - Mimi Sammarco
- Department of Cell and Molecular Biology Tulane University New Orleans LA 70118 USA
| | - Ken Muneoka
- Department of Cell and Molecular Biology Tulane University New Orleans LA 70118 USA.,Department of Veterinary Physiology & Pharmacology Texas A&M University College Station TX7 7843 USA
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10
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Taghiyar L, Hesaraki M, Sayahpour FA, Satarian L, Hosseini S, Aghdami N, Baghaban Eslaminejad M. Msh homeobox 1 ( Msx1)- and Msx2-overexpressing bone marrow-derived mesenchymal stem cells resemble blastema cells and enhance regeneration in mice. J Biol Chem 2017; 292:10520-10533. [PMID: 28461333 DOI: 10.1074/jbc.m116.774265] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 04/29/2017] [Indexed: 01/23/2023] Open
Abstract
Amputation of the proximal region in mammals is not followed by regeneration because blastema cells (BCs) and expression of regenerative genes, such as Msh homeobox (Msx) genes, are absent in this animal group. The lack of BCs and positional information in other cells is therefore the main obstacle to therapeutic approaches for limb regeneration. Hence, this study aimed to create blastema-like cells (BlCs) by overexpressing Msx1 and Msx2 genes in mouse bone marrow-derived mesenchymal stem cells (mBMSCs) to regenerate a proximally amputated digit tip. We transduced mBMSCs with Msx1 and Msx2 genes and compared osteogenic activity and expression levels of several Msx-regulated genes (Bmp4, Fgf8, and keratin 14 (K14)) in BlC groups, including MSX1, MSX2, and MSX1/2 (in a 1:1 ratio) with those in mBMSCs and BCs in vitro and in vivo following injection into the amputation site. We found that Msx gene overexpression increased expression of specific blastemal markers and enhanced the proliferation rate and osteogenesis of BlCs compared with mBMSCs and BCs via activation of Fgf8 and Bmp4 Histological analyses indicated full regrowth of digit tips in the Msx-overexpressing groups, particularly in MSX1/2, through endochondral ossification 6 weeks post-injection. In contrast, mBMSCs and BCs formed abnormal bone and nail. Full digit tip was regenerated only in the MSX1/2 group and was related to boosted Bmp4, Fgf8, and K14 gene expression and to limb-patterning properties resulting from Msx1 and Msx2 overexpression. We propose that Msx-transduced cells that can regenerate epithelial and mesenchymal tissues may potentially be utilized in limb regeneration.
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Affiliation(s)
- Leila Taghiyar
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and.,the Department of Developmental Biology, University of Science and Culture, Tehran 13145-871, Iran
| | - Mahdi Hesaraki
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Forough Azam Sayahpour
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Leila Satarian
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Samaneh Hosseini
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Naser Aghdami
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Mohamadreza Baghaban Eslaminejad
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
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11
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Quijano LM, Lynch KM, Allan CH, Badylak SF, Ahsan T. Looking Ahead to Engineering Epimorphic Regeneration of a Human Digit or Limb. TISSUE ENGINEERING. PART B, REVIEWS 2016; 22:251-62. [PMID: 26603349 PMCID: PMC4892205 DOI: 10.1089/ten.teb.2015.0401] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 11/24/2015] [Indexed: 01/08/2023]
Abstract
Approximately 2 million people have had limb amputations in the United States due to disease or injury, with more than 185,000 new amputations every year. The ability to promote epimorphic regeneration, or the regrowth of a biologically based digit or limb, would radically change the prognosis for amputees. This ambitious goal includes the regrowth of a large number of tissues that need to be properly assembled and patterned to create a fully functional structure. We have yet to even identify, let alone address, all the obstacles along the extended progression that limit epimorphic regeneration in humans. This review aims to present introductory fundamentals in epimorphic regeneration to facilitate design and conduct of research from a tissue engineering and regenerative medicine perspective. We describe the clinical scenario of human digit healing, featuring published reports of regenerative potential. We then broadly delineate the processes of epimorphic regeneration in nonmammalian systems and describe a few mammalian regeneration models. We give particular focus to the murine digit tip, which allows for comparative studies of regeneration-competent and regeneration-incompetent outcomes in the same animal. Finally, we describe a few forward-thinking opportunities for promoting epimorphic regeneration in humans.
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Affiliation(s)
- Lina M. Quijano
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - Kristen M. Lynch
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - Christopher H. Allan
- Department of Orthopedics and Sports Medicine, University of Washington, Seattle, Washington
| | - Stephen F. Badylak
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Tabassum Ahsan
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
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Shieh SJ, Cheng TC. Regeneration and repair of human digits and limbs: fact and fiction. ACTA ACUST UNITED AC 2015; 2:149-68. [PMID: 27499873 PMCID: PMC4857729 DOI: 10.1002/reg2.41] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 08/08/2015] [Accepted: 08/10/2015] [Indexed: 12/15/2022]
Abstract
A variety of digit and limb repair and reconstruction methods have been used in different clinical settings, but regeneration remains an item on every plastic surgeon's "wish list." Although surgical salvage techniques are continually being improved, unreplantable digits and limbs are still abundant. We comprehensively review the structural and functional salvage methods in clinical practice, from the peeling injuries of small distal fingertips to multisegmented amputated limbs, and the developmental and tissue engineering approaches for regenerating human digits and limbs in the laboratory. Although surgical techniques have forged ahead, there are still situations in which digits and limbs are unreplantable. Advances in the field are delineated, and the regeneration processes of salamander limbs, lizard tails, and mouse digits and each component of tissue engineering approaches for digit- and limb-building are discussed. Although the current technology is promising, there are many challenges in human digit and limb regeneration. We hope this review inspires research on the critical gap between clinical and basic science, and leads to more sophisticated digit and limb loss rescue and regeneration innovations.
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Affiliation(s)
- Shyh-Jou Shieh
- Division of Plastic and Reconstructive Surgery, Department of Surgery, National Cheng Kung University Hospital, College of Medicine National Cheng Kung University Tainan Taiwan; International Research Center for Wound Repair and Regeneration (iWRR) National Cheng Kung University Tainan Taiwan
| | - Tsun-Chih Cheng
- Division of Plastic and Reconstructive Surgery, Department of Surgery, National Cheng Kung University Hospital, College of Medicine National Cheng Kung University Tainan Taiwan
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Kisch T, Klemens JM, Hofmann K, Liodaki E, Gierloff M, Moellmeier D, Stang F, Mailaender P, Habermann J, Brandenburger M. Collection of Wound Exudate From Human Digit Tip Amputations Does Not Impair Regenerative Healing: A Randomized Trial. Medicine (Baltimore) 2015; 94:e1764. [PMID: 26469916 PMCID: PMC4616794 DOI: 10.1097/md.0000000000001764] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The regrowth of amputated digit tips represents a unique regenerative healing in mammals with subcutaneous volume regrowth, restoration of dactylogram, and suppression of scar formation. Although factor analysis in amphibians and even in mice is easy to obtain, safety of harvesting biomaterial from human digit tip amputations for analysis has not yet been described.The aim of this study was to evaluate if recovering wound exudate does hamper clinical outcome or influence microbiologic or inflammation status.A predefined cohort of 18 patients with fresh digit tip amputations was randomly assigned to receive standard therapy (debridement, occlusive dressing) with (n = 9) or without (n = 9) collection of the whole wound exudate in every dressing change. Primary endpoint (lengthening) and secondary endpoints (regeneration of dactylogram, nail bed and bone healing, time to complete wound closure, scar formation, 2-point discrimination, microbiologic analysis, inflammatory factors interleukin (IL)-1α, tumor necrosis factor-α, IL-4, and IL-6) were determined by an independent, blinded observer.Patients' characteristics showed no significant differences between the groups. All patients completed the study to the end of 3 months follow-up. Exudate collection did not influence primary and secondary endpoints. Furthermore, positive microbiologic findings as well as pus- and necrosis-like appearance neither impaired tissue restoration nor influenced inflammatory factor release.Here, the authors developed an easy and safe protocol for harvesting wound exudate from human digit tip amputations. For the first time, it was shown that harvesting does not impair regenerative healing. Using this method, further studies can be conducted to analyze regeneration associated factors in the human digit tip.DRKS.de Identifier: DRKS00006882 (UTN: U1111-1166-5723).
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Affiliation(s)
- Tobias Kisch
- From the Department of Plastic Surgery and Hand Surgery, University Hospital Schleswig-Holstein Campus Lübeck, University of Lübeck (TK, EL, MG, DM, FS, PM); Fraunhofer Research Institution for Marine Biotechnology EMB (JMK, KH, MB); and Department of Surgery, Section for Translational Surgical Oncology and Biobanking, University Hospital Schleswig-Holstein Campus Lübeck, University of Lübeck, Lübeck, Germany (JH)
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Fröbisch NB, Bickelmann C, Witzmann F. Early evolution of limb regeneration in tetrapods: evidence from a 300-million-year-old amphibian. Proc Biol Sci 2015; 281:20141550. [PMID: 25253458 PMCID: PMC4211449 DOI: 10.1098/rspb.2014.1550] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Salamanders are the only tetrapods capable of fully regenerating their limbs throughout their entire lives. Much data on the underlying molecular mechanisms of limb regeneration have been gathered in recent years allowing for new comparative studies between salamanders and other tetrapods that lack this unique regenerative potential. By contrast, the evolution of animal regeneration just recently shifted back into focus, despite being highly relevant for research designs aiming to unravel the factors allowing for limb regeneration. We show that the 300-million-year-old temnospondyl amphibian Micromelerpeton, a distant relative of modern amphibians, was already capable of regenerating its limbs. A number of exceptionally well-preserved specimens from fossil deposits show a unique pattern and combination of abnormalities in their limbs that is distinctive of irregular regenerative activity in modern salamanders and does not occur as variants of normal limb development. This demonstrates that the capacity to regenerate limbs is not a derived feature of modern salamanders, but may be an ancient feature of non-amniote tetrapods and possibly even shared by all bony fish. The finding provides a new framework for understanding the evolution of regenerative capacity of paired appendages in vertebrates in the search for conserved versus derived molecular mechanisms of limb regeneration.
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Affiliation(s)
- Nadia B Fröbisch
- Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany
| | - Constanze Bickelmann
- Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany
| | - Florian Witzmann
- Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany
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Lisse TS, Brochu EA, Rieger S. Capturing tissue repair in zebrafish larvae with time-lapse brightfield stereomicroscopy. J Vis Exp 2015. [PMID: 25742070 PMCID: PMC4330669 DOI: 10.3791/52654] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The zebrafish larval tail fin is ideal for studying tissue regeneration due to the simple architecture of the larval fin-fold, which comprises of two layers of skin that enclose undifferentiated mesenchyme, and because the larval tail fin regenerates rapidly within 2-3 days. Using this system, we demonstrate a method for capturing the repair dynamics of the amputated tail fin with time-lapse video brightfield stereomicroscopy. We demonstrate that fin amputation triggers a contraction of the amputation wound and extrusion of cells around the wound margin, leading to their subsequent clearance. Fin regeneration proceeds from proximal to distal direction after a short delay. In addition, developmental growth of the larva can be observed during all stages. The presented method provides an opportunity for observing and analyzing whole tissue-scale behaviors such as fin development and growth in a simple microscope setting, which is easily adaptable to any stereomicroscope with time-lapse capabilities.
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Affiliation(s)
- Thomas S Lisse
- Davis Center for Regenerative Biology and Medicine, MDI Biological Laboratory
| | - Elizabeth A Brochu
- Davis Center for Regenerative Biology and Medicine, MDI Biological Laboratory
| | - Sandra Rieger
- Davis Center for Regenerative Biology and Medicine, MDI Biological Laboratory;
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16
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Beyeler J, Schnyder I, Katsaros C, Chiquet M. Accelerated wound closure in vitro by fibroblasts from a subgroup of cleft lip/palate patients: role of transforming growth factor-α. PLoS One 2014; 9:e111752. [PMID: 25360592 PMCID: PMC4216129 DOI: 10.1371/journal.pone.0111752] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 10/02/2014] [Indexed: 01/11/2023] Open
Abstract
In a fraction of patients surgically treated for cleft lip/palate, excessive scarring disturbs maxillary growth and dento-alveolar development. Since certain genes are involved in craniofacial morphogenesis as well as tissue repair, a primary defect causing cleft lip/palate could lead to altered wound healing. We performed in vitro wound healing assays with primary lip fibroblasts from 16 cleft lip/palate patients. Nine foreskin fibroblast strains were included for comparison. Cells were grown to confluency and scratch wounds were applied; wound closure was monitored morphometrically over time. Wound closure rate showed highly significant differences between fibroblast strains. Statistically, fibroblast strains from the 25 individuals could be divided into three migratory groups, namely “fast”, “intermediate”, and “slow”. Most cleft lip/palate fibroblasts were distributed between the “fast” (5 strains) and the “intermediate” group (10 strains). These phenotypes were stable over different cell passages from the same individual. Expression of genes involved in cleft lip/palate and wound repair was determined by quantitative PCR. Transforming growth factor-α mRNA was significantly up-regulated in the “fast” group. 5 ng/ml transforming growth factor-α added to the culture medium increased the wound closure rate of cleft lip/palate strains from the “intermediate” migratory group to the level of the “fast”, but had no effect on the latter group. Conversely, antibody to transforming growth factor-α or a specific inhibitor of its receptor most effectively reduced the wound closure rate of “fast” cleft lip/palate strains. Thus, fibroblasts from a distinct subgroup of cleft lip/palate patients exhibit an increased migration rate into wounds in vitro, which is linked to higher transforming growth factor-α expression and attenuated by interfering with its signaling.
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Affiliation(s)
- Joël Beyeler
- Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Isabelle Schnyder
- University Clinic for Childrens' Surgery, Bern University Hospital, Bern, Switzerland
| | - Christos Katsaros
- Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Matthias Chiquet
- Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine, University of Bern, Bern, Switzerland
- * E-mail:
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Turner NJ, Keane TJ, Badylak SF. Lessons from developmental biology for regenerative medicine. ACTA ACUST UNITED AC 2013; 99:149-59. [DOI: 10.1002/bdrc.21040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 07/27/2013] [Accepted: 07/27/2013] [Indexed: 12/17/2022]
Affiliation(s)
- Neill J. Turner
- McGowan Institute for Regenerative Medicine; University of Pittsburgh, Pittsburgh, Pennsylvania and Department of Surgery, University of Pittsburgh; Pittsburgh Pennsylvania
| | - Timothy J. Keane
- McGowan Institute for Regenerative Medicine; University of Pittsburgh, Pittsburgh, Pennsylvania and Department of Bioengineering, University of Pittsburgh; Pittsburgh Pennsylvania
| | - Stephen F. Badylak
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, and Department of Bioengineering, University of Pittsburgh; Pittsburgh Pennsylvania
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Lee J, Marrero L, Yu L, Dawson LA, Muneoka K, Han M. SDF-1α/CXCR4 signaling mediates digit tip regeneration promoted by BMP-2. Dev Biol 2013; 382:98-109. [PMID: 23916851 DOI: 10.1016/j.ydbio.2013.07.020] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 06/29/2013] [Accepted: 07/23/2013] [Indexed: 12/16/2022]
Abstract
Previously we demonstrated that BMP signaling is required for endogenous digit tip regeneration, and that treatment with BMP-2 or -7 induces a regenerative response following amputation at regeneration-incompetent levels (Yu et al., 2010, 2012). Both endogenous regeneration and BMP-induced regeneration are associated with the transient formation of a blastema, however the formation of a regeneration blastema in mammals is poorly understood. In this study, we focus on how blastema cells respond to BMP signaling during neonatal digit regeneration in mice. First, we show that blastema cells retain regenerative properties after expansion in vitro, and when re-introduced into the amputated digit, these cells display directed migration in response to BMP-2. However, in vitro studies demonstrate that BMP-2 alone does not influence blastema cell migration, suggesting a requirement of another pivotal downstream factor for cell recruitment. We show that blastema cell migration is stimulated by the cytokine, SDF-1α, and that SDF-1α is expressed by the wound epidermis as well as endothelial cells of the blastema. Blastema cells express both SDF-1α receptors, CXCR4 and CXCR7, although the migration response is inhibited by the CXCR4-specific antagonist, AMD3100. Mice treated with AMD3100 display a partial inhibition of skeletal regrowth associated with the regeneration response. We provide evidence that BMP-2 regulates Sdf-1α expression in endothelial cells but not cells of the wound epidermis. Finally, we show that SDF-1α-expressing COS1 cells engrafted into a regeneration-incompetent digit amputation wound resulted in a locally enhanced population of CXCR4 positive cells, and induced a partial regenerative response. Taken together, this study provides evidence that one downstream mechanism of BMP signaling during mammalian digit regeneration involves activation of SDF-1α/CXCR4 signaling by endothelial cells to recruit blastema cells.
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Affiliation(s)
- Jangwoo Lee
- Division of Developmental Biology, Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
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19
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Roshan A, Grant I. Lessons for adult fingertip regeneration: glimpses from basic research. J Hand Surg Am 2012; 37:1287-90. [PMID: 22624788 DOI: 10.1016/j.jhsa.2012.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 02/01/2012] [Accepted: 04/02/2012] [Indexed: 02/02/2023]
Abstract
Understanding the mechanisms involved in limb and finger regeneration holds promise for improving current treatment therapies. Recent animal studies have improved our understanding of the limb regeneration process markedly. Improved sophistication in experimentation has allowed results that partly reveal the cells of origin in fingertip regeneration in mouse models, which implicates a tissue-resident progenitor cell population. The impressive regeneration of amputated salamander limbs has been shown to work through an evolutionarily divergent mechanism and may not be open to direct translational approaches in mammals. In addition, researchers are beginning to understand the complexity of the interrelated mechanisms of axis determinants in chick embryo limb development. In this article, we review lessons to be learned from these divergent experiments, to understand fingertip regeneration in humans.
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Affiliation(s)
- Amit Roshan
- MRC-Cancer Cell Unit, Department of Oncology, University of Cambridge, Cambridge, UK.
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20
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Mouse digit tip regeneration is mediated by fate-restricted progenitor cells. Proc Natl Acad Sci U S A 2011; 108:20609-14. [PMID: 22143790 DOI: 10.1073/pnas.1118017108] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Regeneration of appendages is frequent among invertebrates as well as some vertebrates. However, in mammals this has been largely relegated to digit tip regeneration, as found in mice and humans. The regenerated structures are formed from a mound of undifferentiated cells called a blastema, found just below the site of amputation. The blastema ultimately gives rise to all of the tissues in the regenerate, excluding the epidermis, and has classically been thought of as a homogenous pool of pluripotent stem cells derived by dedifferentiation of stump tissue, although this has never been directly tested in the context of mammalian digit tip regeneration. Successful digit tip regeneration requires that the level of amputation be within the nail bed and depends on expression of Msx1. Because Msx1 is strongly expressed in the nail bed mesenchyme, it has been proposed that the Msx1-expressing cells represent a pluripotent cell population for the regenerating digit. In this report, we show that Msx1 is dynamically expressed during digit tip regeneration, and it does not mark a pluripotent stem cell population. Moreover, we show that both the ectoderm and mesoderm contain fate-restricted progenitor populations that work in concert to regenerate their own lineages within the digit tip, supporting the hypothesis that the blastema is a heterogeneous pool of progenitor cells.
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Meech R, Gomez M, Woolley C, Barro M, Hulin JA, Walcott EC, Delgado J, Makarenkova HP. The homeobox transcription factor Barx2 regulates plasticity of young primary myofibers. PLoS One 2010; 5:e11612. [PMID: 20657655 PMCID: PMC2904708 DOI: 10.1371/journal.pone.0011612] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 06/23/2010] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Adult mammalian muscle retains incredible plasticity. Muscle growth and repair involves the activation of undifferentiated myogenic precursors called satellite cells. In some circumstances, it has been proposed that existing myofibers may also cleave and produce a pool of proliferative cells that can re-differentiate into new fibers. Such myofiber dedifferentiation has been observed in the salamander blastema where it may occur in parallel with satellite cell activation. Moreover, ectopic expression of the homeodomain transcription factor Msx1 in differentiated C2C12 myotubes has been shown to induce their dedifferentiation. While it remains unclear whether dedifferentiation and redifferentiaton occurs endogenously in mammalian muscle, there is considerable interest in induced dedifferentiation as a possible regenerative tool. METHODOLOGY/PRINCIPAL FINDINGS We previously showed that the homeobox protein Barx2 promotes myoblast differentiation. Here we report that ectopic expression of Barx2 in young immature myotubes derived from cell lines and primary mouse myoblasts, caused cleavage of the syncytium and downregulation of differentiation markers. Microinjection of Barx2 cDNA into immature myotubes derived from primary cells led to cleavage and formation of mononucleated cells that were able to proliferate. However, injection of Barx2 cDNA into mature myotubes did not cause cleavage. Barx2 expression in C2C12 myotubes increased the expression of cyclin D1, which may promote cell cycle re-entry. We also observed differential muscle gene regulation by Barx2 at early and late stages of muscle differentiation which may be due to differential recruitment of transcriptional activator or repressor complexes to muscle specific genes by Barx2. CONCLUSIONS/SIGNIFICANCE We show that Barx2 regulates plasticity of immature myofibers and might act as a molecular switch controlling cell differentiation and proliferation.
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Affiliation(s)
- Robyn Meech
- The Scripps Research Institute, La Jolla, California, United States of America
- The Flinders University of South Australia, Beford Park, South Australia, Australia
| | - Mariana Gomez
- The Scripps Research Institute, La Jolla, California, United States of America
| | - Christopher Woolley
- The Scripps Research Institute, La Jolla, California, United States of America
| | - Marietta Barro
- The Scripps Research Institute, La Jolla, California, United States of America
| | - Julie-Ann Hulin
- The Scripps Research Institute, La Jolla, California, United States of America
| | | | - Jary Delgado
- The Neurosciences Institute, San Diego, California, United States of America
| | - Helen P. Makarenkova
- The Scripps Research Institute, La Jolla, California, United States of America
- The Neurosciences Institute, San Diego, California, United States of America
- * E-mail:
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Wang G, Badylak SF, Heber-Katz E, Braunhut SJ, Gudas LJ. The effects of DNA methyltransferase inhibitors and histone deacetylase inhibitors on digit regeneration in mice. Regen Med 2010; 5:201-20. [PMID: 20210581 DOI: 10.2217/rme.09.91] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
METHOD We injected two drugs that modify the epigenome, the DNA methyltransferase inhibitor 5-aza-2'-deoxycytidine (5-aza-dC) and the histone deacetylase inhibitor trichostatin A (TSA), alone or in combination, into C57Bl/6 mice subjected to amputation through the mid-second phalanx of the third digit. Wound-site tissue was collected. RESULTS We observed increased staining of the stem cell markers Rex1 (Zfp42) and stem cell antigen-1 at digit amputation sites from drug-treated mice. Samples from 5-aza-dC plus TSA and TSA treated mice also showed increased proliferating cell nuclear antigen staining, a measure of cell proliferation. Drug treatments increased Msx1, but not Cyp26a1 or ALDH1a2 (RALDH2) mRNA. CONCLUSION 5-aza-dC and TSA treatments stimulated cell proliferation at the amputation site, possibly via increased expression of genes involved in digit development and regeneration.
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Affiliation(s)
- Gang Wang
- Department of Pharmacology, Weill Cornell Medical College of Cornell University, 1300 York Avenue, New York, NY 10065, USA.
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Yu L, Han M, Yan M, Lee EC, Lee J, Muneoka K. BMP signaling induces digit regeneration in neonatal mice. Development 2010; 137:551-9. [PMID: 20110320 DOI: 10.1242/dev.042424] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The regenerating digit tip of mice is a novel epimorphic response in mammals that is similar to fingertip regeneration in humans. Both display restricted regenerative capabilities that are amputation-level dependent. Using this endogenous regeneration model in neonatal mice, we have found that noggin treatment inhibits regeneration, thus suggesting a bone morphogenetic protein (BMP) requirement. Using non-regenerating amputation wounds, we show that BMP7 or BMP2 can induce a regenerative response. BMP-induced regeneration involves the formation of a mammalian digit blastema. Unlike the endogenous regeneration response that involves redifferentiation by direct ossification (evolved regeneration), the BMP-induced response involves endochondral ossification (redevelopment). Our evidence suggests that BMP treatment triggers a reprogramming event that re-initiates digit tip development at the amputation wound. These studies demonstrate for the first time that the postnatal mammalian digit has latent regenerative capabilities that can be induced by growth factor treatment.
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Affiliation(s)
- Ling Yu
- Division of Developmental Biology, Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
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Affiliation(s)
- Karen Lyons
- Department of Orthopaedic Surgery and Department of Molecular, Cell and Developmental Biology, David Geffen School of Medicine at UCLA, University of California at Los Angeles, 615 Charles E. Young Drive South, Los Angeles, CA 90095. E-mail address:
| | - Marybeth Ezaki
- Texas Scottish Rite Hospital for Children, 2222 Welborn Street, Dallas, TX 75219. E-mail address:
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Yakushiji N, Yokoyama H, Tamura K. Repatterning in amphibian limb regeneration: A model for study of genetic and epigenetic control of organ regeneration. Semin Cell Dev Biol 2009; 20:565-74. [DOI: 10.1016/j.semcdb.2008.12.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 12/09/2008] [Accepted: 12/13/2008] [Indexed: 02/05/2023]
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Barker DM, Beck CW. Overexpression of the transcription factor Msx1 is insufficient to drive complete regeneration of refractory stageXenopus laevishindlimbs. Dev Dyn 2009; 238:1366-78. [DOI: 10.1002/dvdy.21923] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Muneoka K, Allan CH, Yang X, Lee J, Han M. Mammalian regeneration and regenerative medicine. ACTA ACUST UNITED AC 2008; 84:265-80. [DOI: 10.1002/bdrc.20137] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Han M, Yang X, Lee J, Allan CH, Muneoka K. Development and regeneration of the neonatal digit tip in mice. Dev Biol 2007; 315:125-35. [PMID: 18234177 DOI: 10.1016/j.ydbio.2007.12.025] [Citation(s) in RCA: 155] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 12/13/2007] [Accepted: 12/13/2007] [Indexed: 11/24/2022]
Abstract
The digit tips of children and rodents are known to regenerate following amputation. The skeletal structure that regenerates is the distal region of the terminal phalangeal bone that is associated with the nail organ. The terminal phalanx forms late in gestation by endochondral ossification and continues to elongate until sexual maturity (8 weeks of age). Postnatal elongation at its distal end occurs by appositional ossification, i.e. direct ossification on the surface of the terminal phalanx, whereas proximal elongation results from an endochondral growth plate. Amputation through the middle of the terminal phalanx regenerates whereas regenerative failure is observed following amputation to remove the distal 2/3 of the bone. Regeneration is characterized by the formation of a blastema of proliferating cells that appear undifferentiated and express Bmp4. Using chondrogenic and osteogenic markers we show that redifferentiation does not occur by endochondral ossification but by the direct ossification of blastema cells that form the rudiment of the digit tip. Once formed the rudiment elongates by appositional ossification in parallel with unamputated control digits. Regenerated digits are consistently shorter than unamputated control digits. Finally, we present a case study of a child who suffered an amputation injury at a proximal level of the terminal phalanx, but failed to regenerate despite conservative treatment and the presence of the nail organ. These clinical and experimental findings expand on previously published observations and initiate a molecular assessment of a mammalian regeneration model.
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Affiliation(s)
- Manjong Han
- Division of Developmental Biology, Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
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Abstract
While urodele amphibians (newts and salamanders) can regenerate limbs as adults, other tetrapods (reptiles, birds and mammals) cannot and just undergo wound healing. In adult mammals such as mice and humans, the wound heals and a scar is formed after injury, while wound healing is completed without scarring in an embryonic mouse. Completion of regeneration and wound healing takes a long time in regenerative and non-regenerative limbs, respectively. However, it is the early steps that are critical for determining the extent of regenerative response after limb amputation, ranging from wound healing with scar formation, scar-free wound healing, hypomorphic limb regeneration to complete limb regeneration. In addition to the accumulation of information on gene expression during limb regeneration, functional analysis of signaling molecules has recently shown important roles of fibroblast growth factor (FGF), Wnt/beta-catenin and bone morphogenic protein (BMP)/Msx signaling. Here, the routine steps of wound healing/limb regeneration and signaling molecules specifically involved in limb regeneration are summarized. Regeneration of embryonic mouse digit tips and anuran amphibian (Xenopus) limbs shows intermediate regenerative responses between the two extremes, those of adult mammals (least regenerative) and urodele amphibians (more regenerative), providing a range of models to study the various abilities of limbs to regenerate.
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Affiliation(s)
- Hitoshi Yokoyama
- Howard Hughes Medical Institute, Department of Pharmacology, Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA.
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Stoick-Cooper CL, Moon RT, Weidinger G. Advances in signaling in vertebrate regeneration as a prelude to regenerative medicine. Genes Dev 2007; 21:1292-315. [PMID: 17545465 DOI: 10.1101/gad.1540507] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
While all animals have evolved strategies to respond to injury and disease, their ability to functionally recover from loss of or damage to organs or appendages varies widely damage to skeletal muscle, but, unlike amphibians and fish, they fail to regenerate heart, lens, retina, or appendages. The relatively young field of regenerative medicine strives to develop therapies aimed at improving regenerative processes in humans and is predicated on >40 years of success with bone marrow transplants. Further progress will be accelerated by implementing knowledge about the molecular mechanisms that regulate regenerative processes in model organisms that naturally possess the ability to regenerate organs and/or appendages. In this review we summarize the current knowledge about the signaling pathways that regulate regeneration of amphibian and fish appendages, fish heart, and mammalian liver and skeletal muscle. While the cellular mechanisms and the cell types involved in regeneration of these systems vary widely, it is evident that shared signals are involved in tissue regeneration. Signals provided by the immune system appear to act as triggers of many regenerative processes. Subsequently, pathways that are best known for their importance in regulating embryonic development, in particular fibroblast growth factor (FGF) and Wnt/beta-catenin signaling (as well as others), are required for progenitor cell formation or activation and for cell proliferation and specification leading to tissue regrowth. Experimental activation of these pathways or interference with signals that inhibit regenerative processes can augment or even trigger regeneration in certain contexts.
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Affiliation(s)
- Cristi L Stoick-Cooper
- Department of Pharmacology, Howard Hughes Medical Institute, and Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, Washington 98195, USA
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