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Taghiyar L, Hosseini S, Safari F, Bagheri F, Fani N, Stoddart MJ, Alini M, Eslaminejad MB. New insight into functional limb regeneration: A to Z approaches. J Tissue Eng Regen Med 2018; 12:1925-1943. [PMID: 30011424 DOI: 10.1002/term.2727] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Revised: 02/19/2018] [Accepted: 07/06/2018] [Indexed: 12/31/2022]
Abstract
Limb/digit amputation is a common event in humans caused by trauma, medical illness, or surgery. Although the loss of a digit is not lethal, it affects quality of life and imposes high costs on amputees. In recent years, the increasing interest in limb regeneration has led to enhanced scientific knowledge. However, the limited ability to develop functional limb regeneration in the clinical setting suggests that a challenging issue remains in limb regeneration. Recently, the emergence of regenerative engineering is a promising field to address this challenge and close the gap between science and clinical applications. Cell signalling and molecular mechanisms involved in the limb regeneration process have been extensively studied; however, there is still insufficient data on cell therapy and tissue engineering for limb regeneration. In this review, we intend to focus on therapeutic approaches for limb regeneration that are closely related to gene, immune, and stem cell therapies, as well as tissue engineering approaches that take into consideration the peculiar developmental properties of the limbs. In addition, we attempt to identify the challenges of these strategies for limb regeneration studies in terms of clinical settings and as a road map to accomplish the goal of functional human limb regeneration.
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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
| | - Fatemeh Safari
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Fatemeh Bagheri
- Department of Biotechnology, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
| | - Nesa Fani
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | | | - Mauro Alini
- AO Research Institute Davos, Davos, Switzerland
| | - 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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2
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Tang J, Yu Y, Zheng H, Yin L, Sun M, Wang W, Cui J, Liu W, Xie X, Chen F. ITRAQ-based quantitative proteomic analysis of Cynops orientalis limb regeneration. BMC Genomics 2017; 18:750. [PMID: 28938871 PMCID: PMC5610437 DOI: 10.1186/s12864-017-4125-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 09/06/2017] [Indexed: 02/06/2023] Open
Abstract
Background Salamanders regenerate their limbs after amputation. However, the molecular mechanism of this unique regeneration remains unclear. In this study, isobaric tags for relative and absolute quantification (iTRAQ) coupled with liquid chromatography tandem mass spectrometry (LC-MS/MS) was employed to quantitatively identify differentially expressed proteins in regenerating limbs 3, 7, 14, 30 and 42 days post amputation (dpa). Results Of 2636 proteins detected in total, 253 proteins were differentially expressed during different regeneration stages. Among these proteins, Asporin, Cadherin-13, Keratin, Collagen alpha-1(XI) and Titin were down-regulated. CAPG, Coronin-1A, AnnexinA1, Cathepsin B were up-regulated compared with the control. The identified proteins were further analyzed to obtain information about their expression patterns and functions in limb regeneration. Functional analysis indicated that the differentially expressed proteins were associated with wound healing, immune response, cellular process, metabolism and binding. Conclusions This work indicated that significant proteome alternations occurred during salamander limb regeneration. The results may provide fundamental knowledge to understand the mechanism of limb regeneration. Electronic supplementary material The online version of this article (10.1186/s12864-017-4125-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jie Tang
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Shaanxi Institute of Zoology, 88 Xingqing Road, Xi'an, Shaanxi Province, 710032, People's Republic of China
| | - Yuan Yu
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Hanxue Zheng
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Lu Yin
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Mei Sun
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Wenjun Wang
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Jihong Cui
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Wenguang Liu
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Xin Xie
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China. .,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.
| | - Fulin Chen
- Lab of Tissue Engineering, Faculty of Life Science, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China. .,Provincial Key Laboratory of Biotechnology of Shaanxi, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China. .,Key Laboratory of Resource Biology and Modern Biotechnology in Western China, Ministry of Education, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi Province, 710069, People's Republic of China.
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3
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Stocum DL. Mechanisms of urodele limb regeneration. REGENERATION (OXFORD, ENGLAND) 2017; 4:159-200. [PMID: 29299322 PMCID: PMC5743758 DOI: 10.1002/reg2.92] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 10/04/2017] [Indexed: 12/21/2022]
Abstract
This review explores the historical and current state of our knowledge about urodele limb regeneration. Topics discussed are (1) blastema formation by the proteolytic histolysis of limb tissues to release resident stem cells and mononucleate cells that undergo dedifferentiation, cell cycle entry and accumulation under the apical epidermal cap. (2) The origin, phenotypic memory, and positional memory of blastema cells. (3) The role played by macrophages in the early events of regeneration. (4) The role of neural and AEC factors and interaction between blastema cells in mitosis and distalization. (5) Models of pattern formation based on the results of axial reversal experiments, experiments on the regeneration of half and double half limbs, and experiments using retinoic acid to alter positional identity of blastema cells. (6) Possible mechanisms of distalization during normal and intercalary regeneration. (7) Is pattern formation is a self-organizing property of the blastema or dictated by chemical signals from adjacent tissues? (8) What is the future for regenerating a human limb?
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Affiliation(s)
- David L. Stocum
- Department of BiologyIndiana University−Purdue University Indianapolis723 W. Michigan StIndianapolisIN 46202USA
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Rao N, Song F, Jhamb D, Wang M, Milner DJ, Price NM, Belecky-Adams TL, Palakal MJ, Cameron JA, Li B, Chen X, Stocum DL. Proteomic analysis of fibroblastema formation in regenerating hind limbs of Xenopus laevis froglets and comparison to axolotl. BMC DEVELOPMENTAL BIOLOGY 2014; 14:32. [PMID: 25063185 PMCID: PMC4222900 DOI: 10.1186/1471-213x-14-32] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 07/03/2014] [Indexed: 01/01/2023]
Abstract
Background To gain insight into what differences might restrict the capacity for limb regeneration in Xenopus froglets, we used High Performance Liquid Chromatography (HPLC)/double mass spectrometry to characterize protein expression during fibroblastema formation in the amputated froglet hindlimb, and compared the results to those obtained previously for blastema formation in the axolotl limb. Results Comparison of the Xenopus fibroblastema and axolotl blastema revealed several similarities and significant differences in proteomic profiles. The most significant similarity was the strong parallel down regulation of muscle proteins and enzymes involved in carbohydrate metabolism. Regenerating Xenopus limbs differed significantly from axolotl regenerating limbs in several ways: deficiency in the inositol phosphate/diacylglycerol signaling pathway, down regulation of Wnt signaling, up regulation of extracellular matrix (ECM) proteins and proteins involved in chondrocyte differentiation, lack of expression of a key cell cycle protein, ecotropic viral integration site 5 (EVI5), that blocks mitosis in the axolotl, and the expression of several patterning proteins not seen in the axolotl that may dorsalize the fibroblastema. Conclusions We have characterized global protein expression during fibroblastema formation after amputation of the Xenopus froglet hindlimb and identified several differences that lead to signaling deficiency, failure to retard mitosis, premature chondrocyte differentiation, and failure of dorsoventral axial asymmetry. These differences point to possible interventions to improve blastema formation and pattern formation in the froglet limb.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - David L Stocum
- Department of Biology, and Center for Developmental and Regenerative Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA.
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5
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Evans T, Wade CM, Chapman FA, Johnson AD, Loose M. Acquisition of germ plasm accelerates vertebrate evolution. Science 2014; 344:200-3. [PMID: 24723612 DOI: 10.1126/science.1249325] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Primordial germ cell (PGC) specification occurs either by induction from pluripotent cells (epigenesis) or by a cell-autonomous mechanism mediated by germ plasm (preformation). Among vertebrates, epigenesis is basal, whereas germ plasm has evolved convergently across lineages and is associated with greater speciation. We compared protein-coding sequences of vertebrate species that employ preformation with their sister taxa that use epigenesis and demonstrate that genes evolve more rapidly in species containing germ plasm. Furthermore, differences in rates of evolution appear to cause phylogenetic incongruence in protein-coding sequence comparisons between vertebrate taxa. Our results support the hypothesis that germ plasm liberates constraints on somatic development and that enhanced evolvability drives the evolution of germ plasm.
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Affiliation(s)
- Teri Evans
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK
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6
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Jhamb D, Rao N, Milner DJ, Song F, Cameron JA, Stocum DL, Palakal MJ. Network based transcription factor analysis of regenerating axolotl limbs. BMC Bioinformatics 2011; 12:80. [PMID: 21418574 PMCID: PMC3240668 DOI: 10.1186/1471-2105-12-80] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Accepted: 03/18/2011] [Indexed: 01/13/2023] Open
Abstract
Background Studies on amphibian limb regeneration began in the early 1700's but we still do not completely understand the cellular and molecular events of this unique process. Understanding a complex biological process such as limb regeneration is more complicated than the knowledge of the individual genes or proteins involved. Here we followed a systems biology approach in an effort to construct the networks and pathways of protein interactions involved in formation of the accumulation blastema in regenerating axolotl limbs. Results We used the human orthologs of proteins previously identified by our research team as bait to identify the transcription factor (TF) pathways and networks that regulate blastema formation in amputated axolotl limbs. The five most connected factors, c-Myc, SP1, HNF4A, ESR1 and p53 regulate ~50% of the proteins in our data. Among these, c-Myc and SP1 regulate 36.2% of the proteins. c-Myc was the most highly connected TF (71 targets). Network analysis showed that TGF-β1 and fibronectin (FN) lead to the activation of these TFs. We found that other TFs known to be involved in epigenetic reprogramming, such as Klf4, Oct4, and Lin28 are also connected to c-Myc and SP1. Conclusions Our study provides a systems biology approach to how different molecular entities inter-connect with each other during the formation of an accumulation blastema in regenerating axolotl limbs. This approach provides an in silico methodology to identify proteins that are not detected by experimental methods such as proteomics but are potentially important to blastema formation. We found that the TFs, c-Myc and SP1 and their target genes could potentially play a central role in limb regeneration. Systems biology has the potential to map out numerous other pathways that are crucial to blastema formation in regeneration-competent limbs, to compare these to the pathways that characterize regeneration-deficient limbs and finally, to identify stem cell markers in regeneration.
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Affiliation(s)
- Deepali Jhamb
- School of Informatics, Indiana University-Purdue University Indianapolis, IN 46202, USA
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7
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Stocum DL, Cameron JA. Looking proximally and distally: 100 years of limb regeneration and beyond. Dev Dyn 2011; 240:943-68. [DOI: 10.1002/dvdy.22553] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/18/2010] [Indexed: 01/08/2023] Open
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8
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Rao N, Jhamb D, Milner DJ, Li B, Song F, Wang M, Voss SR, Palakal M, King MW, Saranjami B, Nye HLD, Cameron JA, Stocum DL. Proteomic analysis of blastema formation in regenerating axolotl limbs. BMC Biol 2009; 7:83. [PMID: 19948009 PMCID: PMC2794268 DOI: 10.1186/1741-7007-7-83] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Accepted: 11/30/2009] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Following amputation, urodele salamander limbs reprogram somatic cells to form a blastema that self-organizes into the missing limb parts to restore the structure and function of the limb. To help understand the molecular basis of blastema formation, we used quantitative label-free liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS)-based methods to analyze changes in the proteome that occurred 1, 4 and 7 days post amputation (dpa) through the mid-tibia/fibula of axolotl hind limbs. RESULTS We identified 309 unique proteins with significant fold change relative to controls (0 dpa), representing 10 biological process categories: (1) signaling, (2) Ca2+ binding and translocation, (3) transcription, (4) translation, (5) cytoskeleton, (6) extracellular matrix (ECM), (7) metabolism, (8) cell protection, (9) degradation, and (10) cell cycle. In all, 43 proteins exhibited exceptionally high fold changes. Of these, the ecotropic viral integrative factor 5 (EVI5), a cell cycle-related oncoprotein that prevents cells from entering the mitotic phase of the cell cycle prematurely, was of special interest because its fold change was exceptionally high throughout blastema formation. CONCLUSION Our data were consistent with previous studies indicating the importance of inositol triphosphate and Ca2+ signaling in initiating the ECM and cytoskeletal remodeling characteristic of histolysis and cell dedifferentiation. In addition, the data suggested that blastema formation requires several mechanisms to avoid apoptosis, including reduced metabolism, differential regulation of proapoptotic and antiapoptotic proteins, and initiation of an unfolded protein response (UPR). Since there is virtually no mitosis during blastema formation, we propose that high levels of EVI5 function to arrest dedifferentiated cells somewhere in the G1/S/G2 phases of the cell cycle until they have accumulated under the wound epidermis and enter mitosis in response to neural and epidermal factors. Our findings indicate the general value of quantitative proteomic analysis in understanding the regeneration of complex structures.
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Affiliation(s)
- Nandini Rao
- Department of Biology and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Deepali Jhamb
- School of Informatics and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Derek J Milner
- Department of Cell and Developmental Biology, and Regeneration Biology and Tissue Engineering Theme, Institute for Genomic Biology, University of Illinois-Urbana Champaign, Urbana, IL, USA
| | - Bingbing Li
- Department of Biology and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Fengyu Song
- Department of Oral Biology, School of Dentistry and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Mu Wang
- Department of Biochemistry, School of Medicine and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - S Randal Voss
- Department of Biology and Spinal Cord and Brain Injury Center, University of Kentucky at Lexington, Lexington, KY, USA
| | - Mathew Palakal
- School of Informatics and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Michael W King
- Department of Biochemistry, School of Medicine and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Behnaz Saranjami
- Department of Biology and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Holly LD Nye
- Department of Cell and Developmental Biology, and Regeneration Biology and Tissue Engineering Theme, Institute for Genomic Biology, University of Illinois-Urbana Champaign, Urbana, IL, USA
| | - Jo Ann Cameron
- Department of Cell and Developmental Biology, and Regeneration Biology and Tissue Engineering Theme, Institute for Genomic Biology, University of Illinois-Urbana Champaign, Urbana, IL, USA
| | - David L Stocum
- Department of Biology and Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
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9
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Stocum DL, Zupanc GK. Stretching the limits: Stem cells in regeneration science. Dev Dyn 2008; 237:3648-71. [DOI: 10.1002/dvdy.21774] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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Adams DS, Masi A, Levin M. H+ pump-dependent changes in membrane voltage are an early mechanism necessary and sufficient to induce Xenopus tail regeneration. Development 2007; 134:1323-35. [PMID: 17329365 DOI: 10.1242/dev.02812] [Citation(s) in RCA: 202] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In many systems, ion flows and long-term endogenous voltage gradients regulate patterning events, but molecular details remain mysterious. To establish a mechanistic link between biophysical events and regeneration, we investigated the role of ion transport during Xenopus tail regeneration. We show that activity of the V-ATPase H(+) pump is required for regeneration but not wound healing or tail development. The V-ATPase is specifically upregulated in existing wound cells by 6 hours post-amputation. Pharmacological or molecular genetic loss of V-ATPase function and the consequent strong depolarization abrogates regeneration without inducing apoptosis. Uncut tails are normally mostly polarized, with discrete populations of depolarized cells throughout. After amputation, the normal regeneration bud is depolarized, but by 24 hours post-amputation becomes rapidly repolarized by the activity of the V-ATPase, and an island of depolarized cells appears just anterior to the regeneration bud. Tail buds in a non-regenerative ;refractory' state instead remain highly depolarized relative to uncut or regenerating tails. Depolarization caused by V-ATPase loss-of-function results in a drastic reduction of cell proliferation in the bud, a profound mispatterning of neural components, and a failure to regenerate. Crucially, induction of H(+) flux is sufficient to rescue axonal patterning and tail outgrowth in otherwise non-regenerative conditions. These data provide the first detailed mechanistic synthesis of bioelectrical, molecular and cell-biological events underlying the regeneration of a complex vertebrate structure that includes spinal cord, and suggest a model of the biophysical and molecular steps underlying tail regeneration. Control of H(+) flows represents a very important new modality that, together with traditional biochemical approaches, may eventually allow augmentation of regeneration for therapeutic applications.
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Affiliation(s)
- Dany S Adams
- Center for Regenerative and Developmental Biology, Forsyth Institute, and Developmental Biology Department, Harvard School of Dental Medicine, 140 The Fenway, Boston, MA 02115, USA
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11
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Tseng AS, Adams DS, Qiu D, Koustubhan P, Levin M. Apoptosis is required during early stages of tail regeneration in Xenopus laevis. Dev Biol 2006; 301:62-9. [PMID: 17150209 PMCID: PMC3136124 DOI: 10.1016/j.ydbio.2006.10.048] [Citation(s) in RCA: 184] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2006] [Revised: 10/27/2006] [Accepted: 10/31/2006] [Indexed: 01/16/2023]
Abstract
The Xenopus tadpole is able to regenerate its tail, including skin, muscle, notochord, spinal cord and neurons and blood vessels. This process requires rapid tissue growth and morphogenesis. Here we show that a focus of apoptotic cells appears in the regeneration bud within 12 h of amputation. Surprisingly, when caspase-3 activity is specifically inhibited, regeneration is abolished. This is true of tails both before and after the refractory period. Programmed cell death is only required during the first 24 h after amputation, as later inhibition has no effect on regeneration. Inhibition of caspase-dependent apoptosis results in a failure to induce proliferation in the growth zone, a mispatterning of axons in the regenerate, and the appearance of ectopic otoliths in the neural tube, in the context of otherwise normal continued development of the larva. Larvae amputated during the refractory stage exhibit a much broader domain of caspase-3-positive cells, suggesting a window for the amount of apoptosis that is compatible with normal regeneration. These data reveal novel roles for apoptosis in development and indicate that a degree of apoptosis is an early and obligate component of normal tail regeneration, suggesting the possibility of the existence of endogenous inhibitory cells that must be destroyed by programmed cell death for regeneration to occur.
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Affiliation(s)
| | | | | | | | - Michael Levin
- Corresponding author. Fax: +1 617 892 8597. (M. Levin)
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12
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Stopper GF, Wagner GP. Of chicken wings and frog legs: a smorgasbord of evolutionary variation in mechanisms of tetrapod limb development. Dev Biol 2005; 288:21-39. [PMID: 16246321 DOI: 10.1016/j.ydbio.2005.09.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Revised: 09/06/2005] [Accepted: 09/06/2005] [Indexed: 01/24/2023]
Abstract
The tetrapod limb, which has served as a paradigm for the study of development and morphological evolution, is becoming a paradigm for developmental evolution as well. In its origin and diversification, the tetrapod limb has undergone a great deal of remodeling. These morphological changes and other evolutionary phenomena have produced variation in mechanisms of tetrapod limb development. Here, we review that variation in the four major clades of limbed tetrapods. Comparisons in a phylogenetic context reveal details of development and evolution that otherwise may have been unclear. Such details include apparent differences in the mechanisms of dorsal-ventral patterning and limb identity specification between mouse and chick and mechanistic novelties in amniotes, anurans, and urodeles. As we gain a better understanding of the details of limb development, further differences among taxa will be revealed. The use of appropriate comparative techniques in a phylogenetic context thus sheds light on evolutionary transitions in limb morphology and the generality of developmental models across species and is therefore important to both evolutionary and developmental biologists.
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Affiliation(s)
- Geffrey F Stopper
- Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect Street, New Haven, CT 06520, USA.
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13
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Franssen RA, Marks S, Wake D, Shubin N. Limb chondrogenesis of the seepage salamander,Desmognathus aeneus (Amphibia: Plethodontidae). J Morphol 2005; 265:87-101. [PMID: 15880507 DOI: 10.1002/jmor.10339] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Salamanders are infrequently mentioned in analyses of tetrapod limb formation, as their development varies considerably from that of amniotes. However, urodeles provide an opportunity to study how limb ontogeny varies with major differences in life history. Here we assess limb development in Desmognathus aeneus, a direct-developing salamander, and compare it to patterns seen in salamanders with larval stages (e.g., Ambystoma mexicanum). Both modes of development result in a limb that is morphologically indistinct from an amniote limb. Developmental series of A. mexicanum and D. aeneus were investigated using Type II collagen immunochemistry, Alcian Blue staining, and whole-mount TUNEL staining. In A. mexicanum, as each digit bud extends from the limb palette Type II collagen and proteoglycan secretion occur almost simultaneously with mesenchyme condensation. Conversely, collagen and proteoglycan secretion in digits of D. aeneus occur only after the formation of an amniote-like paddle. Within each species, Type II collagen expression patterns resemble those of proteoglycans. In both, distal structures form before more proximal structures. This observation is contrary to the proximodistal developmental pattern of other tetrapods and may be unique to urodeles. In support of previous findings, no cell death was observed during limb development in A. mexicanum. However, apoptotic cells that may play a role in digit ontogeny occur in the limbs of D. aeneus, thereby suggesting that programmed cell death has evolved as a developmental mechanism at least twice in tetrapod limb evolution.
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Affiliation(s)
- R Adam Franssen
- University of Chicago, Department of Organismal Biology and Anatomy, Chicago, Illinois 60637, USA
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14
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Vlaskalin T, Wong CJ, Tsilfidis C. Growth and apoptosis during larval forelimb development and adult forelimb regeneration in the newt ( Notophthalmus viridescens). Dev Genes Evol 2004; 214:423-31. [PMID: 15322877 DOI: 10.1007/s00427-004-0417-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2004] [Accepted: 05/13/2004] [Indexed: 01/09/2023]
Abstract
Many of the genes involved in the initial development of the limb in higher vertebrates are also expressed during regeneration of the limb in urodeles such as Notophthalmus viridescens. These similarities have led researchers to conclude that the regeneration process is a recapitulation of development, and that patterning of the regenerate mimics pattern formation in development. However, the developing limb and the regenerating limb do not look similar. In developing urodele forelimbs, digits appear sequentially as outgrowths from the limb palette. In regeneration, all the digits appear at once. In this work, we address the issue of whether regeneration and development are similar by examining growth and apoptosis patterns. In contrast to higher vertebrates, forelimb development in the newt, N. viridescens, does not use interdigital apoptosis as the method of digit separation. During adult forelimb regeneration, apoptosis seems to play an important role in wound healing and again during cartilage to bone turnover in the advanced digits and radius/ulna. However, similar to forelimb development, demarcation of the digits in adult forelimb regeneration does not involve interdigital apoptosis. Outgrowth, rather than regression of the interdigital mesenchyme, leads to the individualization of forelimb digits in both newt development and regeneration.
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Affiliation(s)
- Tatjana Vlaskalin
- Ottawa Health Research Institute, University of Ottawa Eye Institute, 501 Smyth Road, Ottawa, ON K1A 8L6, Canada
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15
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Abstract
Larval and adult urodeles and anuran tadpoles readily regenerate their limbs via a process of histolysis and dedifferentiation of mature cells local to the amputation surface that accumulate under the wound epithelium as a blastema of stem cells. These stem cells require growth and trophic factors from the apical epidermal cap (AEC) and the nerves that re-innervate the blastema for their survival and proliferation. Members of the fibroblast growth factor (FGF) family synthesized by both AEC and nerves, and glial growth factor, substance P, and transferrin of nerves are suspected survival and proliferation factors. Stem cells derived from fibroblasts and muscle cells can transdifferentiate into other cell types during regeneration. The regeneration blastema is a self-organizing system based on positional information inherited from parent limb cells. Retinoids, which act through nuclear receptors, have been used in conjunction with assays for cell adhesivity to show that positional identity of blastema cells is encoded in the cell surface. These molecules are involved in the cell-cell signaling network that re-establishes the original structural pattern of the limb. Other systems of interest that regenerate by histolysis and dedifferentiation of pigmented epithelial cells are the neural retina and lens. Members of the FGF family are also important to the regeneration of these structures. The mechanism of amphibian regeneration by dedifferentiation is of importance to the development of a regenerative medicine, since understanding this mechanism may offer insights into how we might chemically induce the regeneration of mammalian tissues.
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Affiliation(s)
- D L Stocum
- Department of Biology, Indiana University Center for Regenerative Biology and Medicine, School of Science, Indiana University-Purdue University Indianapolis, 402 N. Blackford St., Indianapolis, IN 46202, USA.
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16
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Qiu X, Xu H, Haddon C, Lewis J, Jiang YJ. Sequence and embryonic expression of three zebrafishfringe genes:lunatic fringe,radical fringe, andmanic fringe. Dev Dyn 2004; 231:621-30. [PMID: 15376327 DOI: 10.1002/dvdy.20155] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Drosophila fringe and its homologues in vertebrates code for glycosyltransferases that modify Notch, altering the sensitivity of this receptor protein to its ligands Delta and Serrate and, thereby, playing an essential part in the demarcation of tissue boundaries. We describe the isolation and characterization of three zebrafish (Danio rerio) fringe homologues: lunatic fringe (lfng), radical fringe (rfng), and manic fringe (mfng). In addition to the sites previously described (Prince et al. [2001] Mech. Dev. 105:175-180; Leve et al. [ 2001] Dev. Genes Evol. 211:493-500), lfng is also expressed in the sensory patches of the inner ear. The newly described rfng is expressed in adaxial cells, tectum, rhombomere boundaries, and formed somites, but the expression of mfng is only detectable by reverse transcription-polymerase chain reaction and not by whole-mount in situ hybridization (WISH) during early embryonic development; later, it is expressed in the sensory patches of the ear. In mib mutants, where Notch signaling is defective and rhombomere boundaries fail to form, the rfng expression in hindbrain is almost completely lost. None of the three zebrafish fringe genes is detectably expressed in the posterior presomitic mesoderm, suggesting that, in contrast with chick and mouse, the somitogenesis oscillator in this tissue in the zebrafish does not depend on Fringe activity.
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Affiliation(s)
- Xuehui Qiu
- Laboratory of Developmental Signalling and Patterning, Institute of Molecular and Cell Biology, Proteos, 61 Biopolis Drive, Singapore 138673
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17
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Heber-Katz E, Leferovich JM, Bedelbaeva K, Gourevitch D. Spallanzani's mouse: a model of restoration and regeneration. Curr Top Microbiol Immunol 2003; 280:165-89. [PMID: 14594211 DOI: 10.1007/978-3-642-18846-6_5] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
The ability to regenerate is thought to be a lost phenotype in mammals, though there are certainly sporadic examples of mammalian regeneration. Our laboratory has identified a strain of mouse, the MRL mouse, which has a unique capacity to heal complex tissue in an epimorphic fashion, i.e., to restore a damaged limb or organ to its normal structure and function. Initial studies using through-and-through ear punches showed rapid full closure of the ear holes with cartilage growth, new hair follicles, and normal tissue architecture reminiscent of regeneration seen in amphibians as opposed to the scarring usually seen in mammals. Since the ear hole closure phenotype is a quantitative trait, this has been used to show-through extensive breeding and backcrossing--that the trait is heritable. Such analysis reveals that there is a complex genetic basis for this trait with multiple loci. One of the major phenotypes of the MRL mouse is a potent remodeling response with the absence or a reduced level of scarring. MRL healing is associated with the upregulation of the metalloproteinases MMP-2 and MMP-9 and the downregulation of their inhibitors TIMP-2 and TIMP-3, both present in inflammatory cells such as neutrophils and macrophages. This model has more recently been extended to the heart. In this case, a cryoinjury to the right ventricle leads to near complete scarless healing in the MRL mouse whereas scarring is seen in the control mouse. In the MRL heart, bromodeoxyuridine uptake by cardiomyocytes filling the wound site can be seen 60 days after injury. This does not occur in the control mouse. Function in the MRL heart, as measured by echocardiography, returns to normal.
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Affiliation(s)
- E Heber-Katz
- The Wistar Institute, 3602 Spruce Street, Philadelphia, PA 19104, USA.
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18
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Gardiner DM, Endo T, Bryant SV. The molecular basis of amphibian limb regeneration: integrating the old with the new. Semin Cell Dev Biol 2002; 13:345-52. [PMID: 12324216 DOI: 10.1016/s1084952102000903] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Is regeneration close to revealing its secrets? Rapid advances in technology and genomic information, coupled with several useful models to dissect regeneration, suggest that we soon may be in a position to encourage regeneration and enhanced repair processes in humans.
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Affiliation(s)
- David M Gardiner
- Department of Developmental and Cell Biology, Developmental Biology Center, University of California Irvine, Irvine, CA 92697, USA.
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Bely AE, Wray GA. Evolution of regeneration and fission in annelids: insights from engrailed- and orthodenticle-class gene expression. Development 2001; 128:2781-91. [PMID: 11526083 DOI: 10.1242/dev.128.14.2781] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The recent explosion of information on the role of regulatory genes in embryogenesis provides an excellent opportunity to study how these genes participate in post-embryonic developmental processes. We present a detailed comparison of regulatory gene expression during regeneration and asexual reproduction (by fission) in the segmented worm Pristina leidyi (Annelida: Oligochaeta). We isolated three genes from Pristina, one homolog of engrailed and two homologs of orthodenticle, and characterized their expression in different developmental contexts. In situ hybridization studies on worms undergoing normal growth, regeneration and fission demonstrate that in all three processes, Pl-en is expressed primarily in the developing nervous system, and Pl-Otx1 and Pl-Otx2 are expressed primarily in the anterior body wall, foregut and developing nervous system. Our data reveal extensive similarities between expression during regeneration and fission, consistent with the idea that similar developmental processes underlie these two types of development. Thus, we argue that in these annelids fission may have evolved by recruitment of regenerative processes. Furthermore, by comparing our data to existing data from leech embryos, we find evidence that embryonic processes are re-deployed during regeneration and fission.
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Affiliation(s)
- A E Bely
- Department of Ecology and Evolution, State University of New York at Stony Brook, 11794-5245, USA.
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20
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Affiliation(s)
- D M Gardiner
- Developmental Biology Center and Department of Developmental and Cell Biology, University of California Irvine, Irvine, CA, 92697, USA.
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