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Ishii T, Takashimizu I, Casco-Robles MM, Taya Y, Yuzuriha S, Toyama F, Maruo F, Kishi K, Chiba C. Skin Wound Healing of the Adult Newt, Cynops pyrrhogaster: A Unique Re-Epithelialization and Scarless Model. Biomedicines 2021; 9:biomedicines9121892. [PMID: 34944708 PMCID: PMC8698868 DOI: 10.3390/biomedicines9121892] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/10/2021] [Accepted: 12/11/2021] [Indexed: 11/29/2022] Open
Abstract
In surgical and cosmetic studies, scarless regeneration is an ideal method to heal skin wounds. To study the technologies that enable scarless skin wound healing in medicine, animal models are useful. However, four-limbed vertebrates, including humans, generally lose their competency of scarless regeneration as they transit to their terrestrial life-stages through metamorphosis, hatching or birth. Therefore, animals that serve as a model for postnatal humans must be an exception to this rule, such as the newt. Here, we evaluated the adult newt in detail for the first time. Using a Japanese fire-bellied newt, Cynops pyrrhogaster, we excised the full-thickness skin at various locations on the body, and surveyed their re-epithelialization, granulation or dermal fibrosis, and recovery of texture and appendages as well as color (hue, tone and pattern) for more than two years. We found that the skin of adult newts eventually regenerated exceptionally well through unique processes of re-epithelialization and the absence of fibrotic scar formation, except for the dorsal-lateral to ventral skin whose unique color patterns never recovered. Color pattern is species-specific. Consequently, the adult C. pyrrhogaster provides an ideal model system for studies aimed at perfect skin wound healing and regeneration in postnatal humans.
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Affiliation(s)
- Tatsuyuki Ishii
- Department of Plastic and Reconstructive Surgery, Keio University, Shinanomachi 35, Tokyo 160-8582, Japan;
| | - Ikkei Takashimizu
- Department of Plastic and Reconstructive Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan; (I.T.); (S.Y.)
| | - Martin Miguel Casco-Robles
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8572, Japan; (M.M.C.-R.); (F.M.)
| | - Yuji Taya
- Department of Pathology, The Nippon Dental University School of Life Dentistry at Tokyo, Fujimi 1-9-20, Tokyo 102-8159, Japan;
| | - Shunsuke Yuzuriha
- Department of Plastic and Reconstructive Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan; (I.T.); (S.Y.)
| | - Fubito Toyama
- Graduate School of Engineering, Utsunomiya University, Yoto 7-1-2, Utsunomiya 321-8585, Japan;
| | - Fumiaki Maruo
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8572, Japan; (M.M.C.-R.); (F.M.)
| | - Kazuo Kishi
- Department of Plastic and Reconstructive Surgery, Keio University, Shinanomachi 35, Tokyo 160-8582, Japan;
- Correspondence: (K.K.); (C.C.)
| | - Chikafumi Chiba
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8572, Japan; (M.M.C.-R.); (F.M.)
- Correspondence: (K.K.); (C.C.)
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Reviewing the Effects of Skin Manipulations on Adult Newt Limb Regeneration: Implications for the Subcutaneous Origin of Axial Pattern Formation. Biomedicines 2021; 9:biomedicines9101426. [PMID: 34680543 PMCID: PMC8533417 DOI: 10.3390/biomedicines9101426] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/05/2021] [Accepted: 10/07/2021] [Indexed: 11/16/2022] Open
Abstract
Newts are unique salamanders that can regenerate their limbs as postmetamorphic adults. In order to regenerate human limbs as newts do, it is necessary to determine whether the cells homologous to those contributing to the limb regeneration of adult newts also exist in humans. Previous skin manipulation studies in larval amphibians have suggested that stump skin plays a pivotal role in the axial patterning of regenerating limbs. However, in adult newts such studies are limited, though they are informative. Therefore, in this article we have conducted skin manipulation experiments such as rotating the skin 180° around the proximodistal axis of the limb and replacing half of the skin with that of another location on the limb or body. We found that, contrary to our expectations, adult newts robustly regenerated limbs with a normal axial pattern regardless of skin manipulation, and that the appearance of abnormalities was stochastic. Our results suggest that the tissue under the skin, rather than the skin itself, in the intact limb is of primary importance in ensuring the normal axial pattern formation in adult newt limb regeneration. We propose that the important tissues are located in small areas underlying the ventral anterior and ventral posterior skin.
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Mescher AL, Neff AW, King MW. Changes in the inflammatory response to injury and its resolution during the loss of regenerative capacity in developing Xenopus limbs. PLoS One 2013; 8:e80477. [PMID: 24278286 PMCID: PMC3835323 DOI: 10.1371/journal.pone.0080477] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 10/12/2013] [Indexed: 12/31/2022] Open
Abstract
Tissue and organ regeneration, unlike development, involves an injury that in postembryonic animals triggers inflammation followed by resolution. How inflammation affects epimorphic regeneration is largely uninvestigated. Here we examine inflammation and its resolution in Xenopus laevis hindlimb regeneration, which declines during larval development. During the first 5 days postamputation, both regeneration-competent stage 53 and regeneration-deficient stage 57 hindlimbs showed very rapid accumulation of leukocytes and cells expressing interleukin-1β and matrix metalloproteinase 9. Expression of genes for factors mediating inflammatory resolution appeared more persistent at stages 55 and 57 than at stage 53, suggesting changes in this process during development. FoxP3, a marker for regulatory T cells, was upregulated by amputation in limbs at all three stages but only persisted at stage 57, when it was also detected before amputation. Expression of genes for cellular reprogramming, such as SALL4, was upregulated in limbs at all 3 stages, but markers of limb patterning, such as Shh, were expressed later and less actively after amputation in regeneration-deficient limbs. Topical application of specific proinflammatory agents to freshly amputated limbs increased interleukin-1β expression locally. With aqueous solutions of the proinflammatory metal beryllium sulfate, this effect persisted through 7 days postamputation and was accompanied by inhibition of regeneration. In BeSO4-treated limbs expression of markers for both inflammation and resolution, including FoxP3, was prolonged, while genes for cellular reprogramming were relatively unaffected and those for limb patterning failed to be expressed normally. These data imply that in Xenopus hindlimbs postamputation inflammation and its resolution change during development, with little effect on cellular dedifferentiation or reprogramming, but potentially interfering with the expression of genes required for blastema patterning. The results suggest that developmental changes in the larval anuran immune system may be involved in the ontogenetic loss of epimorphic regeneration in this system.
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Affiliation(s)
- Anthony L. Mescher
- Indiana University Center for Regenerative Biology and Medicine, Indiana University School of Medicine, Bloomington, Indiana, United States of America
- * E-mail:
| | - Anton W. Neff
- Indiana University Center for Regenerative Biology and Medicine, Indiana University School of Medicine, Bloomington, Indiana, United States of America
| | - Michael W. King
- Indiana University School of Medicine, Terre Haute, Indiana, United States of America
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Kinefuchi K, Kushida Y, Touma M, Hosono M. Limited Immune Diversity in Urodela: Chronic Transplantation Responses Occur Even with Family-disparate Xenografts. Zoolog Sci 2013; 30:577-84. [DOI: 10.2108/zsj.30.577] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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