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Immunolocalization of FGF8/10 in the Apical Epidermal Peg and Blastema of the regenerating tail in lizard marks this apical growing area. Ann Anat 2016; 206:14-20. [PMID: 27113329 DOI: 10.1016/j.aanat.2016.03.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Revised: 03/28/2016] [Accepted: 03/30/2016] [Indexed: 11/20/2022]
Abstract
Previous studies have shown that Fibroblast Growth Factors are present in the regenerating tail tissues of lizards where they may stimulate the process of regeneration. The present study is focused on the immunolocalization of FGF8 and FGF10 in the regenerating lizard tail, two signaling proteins of the apical epidermal cup/ridge and mesenchymal blastema sustaining tail and limb regeneration in amphibians and the development of the tail and limbs in vertebrate embryos. Main immunoreactive protein bands at 15-18kDa for FGF8/10 are detected in the regenerating epidermis and only a band at 30 or 35kDa in the underlying connective tissues. FGF8 appears particularly localized in cells and nuclei of the apical epidermal peg and of the ependymal ampulla present at the tip of the regenerating tail. FGF10 is also immuno-localized in the apical epidermis but is particularly intensely localized in the mesenchyme of the apical blastema. In accordance with previous studies, the present observations supports the hypothesis that the apical epidermal peg and the ependymal tube with the few regenerated neurons present within it, release FGF8/10 that may contribute to maintenance of cell proliferation in the apical front of the mesenchyme for the growth of the regenerating tail.
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Alibardi L. Cell proliferation in the amputated limb of lizard leading to scarring is reduced compared to the regenerating tail. ACTA ZOOL-STOCKHOLM 2016. [DOI: 10.1111/azo.12161] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Dipartimento di Bigea; Università di Bologna; via Selmi 3 Bologna 40126 Italy
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Mangoni ML, McDermott AM, Zasloff M. Antimicrobial peptides and wound healing: biological and therapeutic considerations. Exp Dermatol 2016; 25:167-73. [PMID: 26738772 PMCID: PMC4789108 DOI: 10.1111/exd.12929] [Citation(s) in RCA: 229] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/17/2015] [Indexed: 12/13/2022]
Abstract
Repair of tissue wounds is a fundamental process to re-establish tissue integrity and regular function. Importantly, infection is a major factor that hinders wound healing. Multicellular organisms have evolved an arsenal of host-defense molecules, including antimicrobial peptides (AMPs), aimed at controlling microbial proliferation and at modulating the host's immune response to a variety of biological or physical insults. In this brief review, we provide the evidence for a role of AMPs as endogenous mediators of wound healing and their promising therapeutic potential for the treatment of non-life-threatening skin and other epithelial injuries.
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Affiliation(s)
- Maria Luisa Mangoni
- Istituto Pasteur-Fondazione Cenci Bolognetti, Department of Biochemical Sciences “A. Rossi Fanelli”, Sapienza University of Rome, Rome, IT
| | - Alison M. McDermott
- The Ocular Surface Institute, College of Optometry, University of Houston, Houston, TX, USA
| | - Michael Zasloff
- MedStar Georgetown Transplant Institute, Georgetown University Hospital, Washington DC, USA
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Alibardi L. Localization of Proliferating Cells in the Inter-Vertebral Region of the Developing and Adult Vertebrae of Lizards in Relation to Growth and Regeneration. Anat Rec (Hoboken) 2016; 299:461-73. [DOI: 10.1002/ar.23319] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 12/08/2015] [Accepted: 12/16/2015] [Indexed: 12/31/2022]
Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Department of Bigea; University of Bologna; Italy
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55
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Alibardi L. Immunolocalization of c-myc-positive cells in lizard tail after amputation suggests cell activation and proliferation for tail regeneration. ACTA ZOOL-STOCKHOLM 2015. [DOI: 10.1111/azo.12153] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Department of Bigea; University of Bologna; Bologna Italy
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Alibardi L. Immunocalization of telomerase in cells of lizard tail after amputation suggests cell activation for tail regeneration. Tissue Cell 2015; 48:63-71. [PMID: 26697743 DOI: 10.1016/j.tice.2015.10.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 10/25/2015] [Accepted: 10/25/2015] [Indexed: 01/28/2023]
Abstract
Tail amputation (autotomy) in most lizards elicits a remarkable regenerative response leading to a new although simplified tail. No information on the trigger mechanism following wounding is known but cells from the stump initiate to proliferate and form a regenerative blastema. The present study shows that telomerases are mainly activated in the nuclei of various connective and muscle satellite cells of the stump, and in other tissues, probably responding to the wound signals. Western blotting detection also indicates that telomerase positive bands increases in the regenerating blastema in comparison to the normal tail. Light and ultrastructural immunocytochemistry localization of telomerase shows that 4-14 days post-amputation in lizards immunopositive nuclei of sparse cells located among the wounded tissues are accumulating into the forming blastema. These cells mainly include fibroblasts and fat cells of the connective tissue and satellite cells of muscles. Also some immature basophilic and polychromatophilic erytroblasts, lymphoblasts and myelocytes present within the Bone Marrow of the vertebrae show telomerase localization in their nuclei, but their contribution to the formation of the regenerative blastema remains undetermined. The study proposes that one of the initial mechanisms triggering cell proliferation for the formation of the blastema in lizards involve gene activation for the production of telomerase that stimulates the following signaling pathways for cell division and migration.
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Affiliation(s)
- L Alibardi
- Comparative Histolab and Department of Bigea, University of Bologna, via Selmi 3, 40126 Bologna, Italy.
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57
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Alibardi L. Original and regenerating lizard tail cartilage contain putative resident stem/progenitor cells. Micron 2015; 78:10-18. [DOI: 10.1016/j.micron.2015.06.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 06/17/2015] [Accepted: 06/17/2015] [Indexed: 01/10/2023]
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58
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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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59
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Alibardi L. Immunolocalization of FGF7 (KGF) in the regenerating tail of lizard suggests it is involved in the differentiation of the epidermis. Acta Histochem 2015; 117:718-24. [PMID: 26508592 DOI: 10.1016/j.acthis.2015.09.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 09/01/2015] [Accepted: 09/15/2015] [Indexed: 11/28/2022]
Abstract
Previous studies showed that Fibroblast Growth Factors (FGF) 1 and 2 are localized in the tissues of the regenerating tail in lizards. In the present immunofluorescence and immunoblotting study we have specifically analyzed the presence and distribution of FGF7 (keratinocyte growth factor) in the regenerating tissues of the tail. FGF7 immunoreactivity is mainly detected in the regenerating epidermis and in sparse fibroblasts of the underlying dermis of the regenerating scales while it is weaker in the other tissues such as the apical ependymal cells and early regenerating muscles. Immunolabeled mesenchymal fibroblasts are frequently present under the epidermis of the forming outer scale surface, a localization that might be connected to beta-cell differentiation in this region of the scale. FGF7 immunolabeling is also seen in differentiating beta-keratinocytes of the beta-layer in the regenerating scales. The present immunofluorescent observations suggest that FGF7 is specifically utilized as a paracrine factor during the process of differentiation of the epidermal layers in the regenerating scales and in particular for beta-cells differentiation.
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Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Dipartimento di Biologia, Universita' di Bologna, via Selmi 3, Bologna, Italy
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60
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Alibardi L. Immunolocalization indicates that both original and regenerated lizard tail tissues contain populations of long retaining cells, putative stem/progenitor cells. Microsc Res Tech 2015; 78:1032-45. [DOI: 10.1002/jemt.22581] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 08/07/2015] [Accepted: 08/18/2015] [Indexed: 12/31/2022]
Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Department of Bigea; University of Bologna; Bologna Italy
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61
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Alibardi L. Regeneration of Articular Cartilage in Lizard Knee from Resident Stem/Progenitor Cells. Int J Mol Sci 2015; 16:20731-47. [PMID: 26340619 PMCID: PMC4613228 DOI: 10.3390/ijms160920731] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 07/09/2015] [Accepted: 08/10/2015] [Indexed: 11/16/2022] Open
Abstract
The epiphysis of femur and tibia in the lizard Podarcis muralis can extensively regenerate after injury. The process involves the articular cartilage and metaphyseal (growth) plate after damage. The secondary ossification center present between the articular cartilage and the growth plate is replaced by cartilaginous epiphyses after about one month of regeneration at high temperature. The present study analyzes the origin of the chondrogenic cells from putative stem cells located in the growing centers of the epiphyses. The study is carried out using immunocytochemistry for the detection of 5BrdU-labeled long retaining cells and for the localization of telomerase, an enzyme that indicates stemness. The observations show that putative stem cells retaining 5BrdU and positive for telomerase are present in the superficial articular cartilage and metaphyseal growth plate located in the epiphyses. This observation suggests that these areas represent stem cell niches lasting for most of the lifetime of lizards. In healthy long bones of adult lizards, the addition of new chondrocytes from the stem cells population in the articular cartilage and the metaphyseal growth plate likely allows for slow, continuous longitudinal growth. When the knee is injured in the adult lizard, new populations of chondrocytes actively producing chondroitin sulfate proteoglycan are derived from these stem cells to allow for the formation of completely new cartilaginous epiphyses, possibly anticipating the re-formation of secondary centers in later stages. The study suggests that in this lizard species, the regenerative ability of the epiphyses is a pre-adaptation to the regeneration of the articular cartilage.
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Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Department of Bigea, University of Bologna, via Selmi 3, 40126 Bologna, Italy.
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62
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Alibardi L. Immunolocalization of a p53/p63-like protein in the regenerating tail of the wall lizard (Podarcis muralis) suggests it is involved in the differentiation of the epidermis. ACTA ZOOL-STOCKHOLM 2015. [DOI: 10.1111/azo.12130] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Dipartimento di Bigea; Universita' di Bologna; Bologna Italy
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63
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Regeneration of the Epiphysis Including the Articular Cartilage in the Injured Knees of the Lizard Podarcis muralis. J Dev Biol 2015. [DOI: 10.3390/jdb3020071] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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64
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Alibardi L. Ultrastructural immunolocalization of nestin in the regenerating tail of lizards shows its presence during cytoskeletal modifications in the epidermis, muscles and nerves. Tissue Cell 2015; 47:178-85. [DOI: 10.1016/j.tice.2015.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 01/07/2015] [Accepted: 01/14/2015] [Indexed: 10/24/2022]
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65
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Lozito TP, Tuan RS. Lizard tail regeneration: regulation of two distinct cartilage regions by Indian hedgehog. Dev Biol 2015; 399:249-62. [DOI: 10.1016/j.ydbio.2014.12.036] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Revised: 11/18/2014] [Accepted: 12/31/2014] [Indexed: 10/24/2022]
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66
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Alibardi L. Immunolocalization of the telomerase‐1 component in cells of the regenerating tail, testis, and intestine of lizards. J Morphol 2015; 276:748-58. [DOI: 10.1002/jmor.20375] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/27/2014] [Accepted: 01/24/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Dipartimento of BigeaUniversity of Bologna Bologna Italy
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67
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Observations on Lumbar Spinal Cord Recovery after Lesion in Lizards Indicates Regeneration of a Cellular and Fibrous Bridge Reconnecting the Injured Cord. J Dev Biol 2014. [DOI: 10.3390/jdb2040210] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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68
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Alibardi L. Immunolocalization of Nestin in the lizard Podarcis muralis indicates up-regulation during the process of tail regeneration and epidermal differentiation. Ann Anat 2014; 196:135-43. [DOI: 10.1016/j.aanat.2013.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 12/03/2013] [Accepted: 12/06/2013] [Indexed: 01/03/2023]
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69
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Ultrastructural immunolocalization of chatelicidin-like peptides in granulocytes of normal and regenerating lizard tissues. Acta Histochem 2014; 116:363-71. [PMID: 24139311 DOI: 10.1016/j.acthis.2013.08.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 08/27/2013] [Accepted: 08/28/2013] [Indexed: 12/11/2022]
Abstract
The presence and localization of cathelicidin anti-microbial peptides in the lizard, Anolis carolinensis, were investigated by immunocytochemistry. The study showed that immunoreactivity for cathelicidins 1 and 2 was only present in large granules of heterophilic-basophilic granulocytes, rarely found in the dermis and sub-dermal muscle in normal and more frequently in wound and regenerating skin tissues or in the blood. Some immunopositive granulocytes were also observed among the keratinocytes of the wound epithelium covering the tail stump and occasionally in the regenerating epidermis of the tail. Immunolabeling for cathelicidins was also seen in low electrondense amorphous material present on the surface of the wound epidermis and on the plasma membrane of bacteria present on the surface of corneocytes of the epidermis. Immunolabeling for cathelicidins was absent in the other cell types and in control sections. The study suggests that cathelicidins are normally stored in granulocytes in the blood or in connective tissues, while keratinocytes can be stimulated to produce and possibly release these molecules only after injury or microbial invasion.
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70
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Wu P, Alibardi L, Chuong CM. Regeneration of reptilian scales after wounding: neogenesis, regional difference, and molecular modules. ACTA ACUST UNITED AC 2014; 1:15-26. [PMID: 24665362 PMCID: PMC3961719 DOI: 10.1002/reg2.9] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Lizard skin can produce scales during embryonic development, tail regeneration, and wound healing; however, underlying molecular signaling and extracellular matrix protein expression remains unknown. We mapped cell proliferation, signaling and extracellular matrix proteins in regenerating and developing lizard scales in different body regions with different wound severity. Following lizard tail autotomy (self‐amputation), de novo scales regenerate from regenerating tail blastema. Despite topological differences between embryonic and adult scale formation, asymmetric cell proliferation produces the newly formed outer scale surface. Regionally different responses to wounding were observed; open wounds induced better scale regeneration from tail skin than trunk skin. Molecular studies suggest that neural cell adhesion molecule enriched dermal regions exhibit higher cell proliferation associated with scale growth. β‐catenin may be involved in epidermal scale differentiation. Dynamic tenascin‐C expression suggests its involvement in regeneration. We conclude that different skin regions exhibit different competence for de novo scale formation. While cellular and morphogenetic paths differ during development and regeneration of lizard scale formation, they share general proliferation patterns, epithelial−mesenchymal interactions and similar molecular modules composed of adhesion and extracellular matrix molecules.
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Affiliation(s)
- Ping Wu
- Department of Pathology, University of Southern California, Los Angeles, California 90033, USA
| | | | - Cheng-Ming Chuong
- Department of Pathology, University of Southern California, Los Angeles, California 90033, USA
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71
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Alibardi L. Histochemical, Biochemical and Cell Biological aspects of tail regeneration in lizard, an amniote model for studies on tissue regeneration. ACTA ACUST UNITED AC 2014; 48:143-244. [DOI: 10.1016/j.proghi.2013.12.001] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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72
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Higham TE, Russell AP, Zani PA. Integrative Biology of Tail Autotomy in Lizards. Physiol Biochem Zool 2013; 86:603-10. [DOI: 10.1086/673875] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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73
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Gilbert RW, Vickaryous MK, Viloria-Petit AM. Characterization of TGFβ signaling during tail regeneration in the leopard Gecko (Eublepharis macularius). Dev Dyn 2013; 242:886-96. [DOI: 10.1002/dvdy.23977] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 04/07/2013] [Accepted: 04/08/2013] [Indexed: 11/06/2022] Open
Affiliation(s)
- Richard W.D. Gilbert
- Department of Biomedical Sciences; Ontario Veterinary College, University of Guelph; Guelph Ontario Canada
| | - Matthew K. Vickaryous
- Department of Biomedical Sciences; Ontario Veterinary College, University of Guelph; Guelph Ontario Canada
| | - Alicia M. Viloria-Petit
- Department of Biomedical Sciences; Ontario Veterinary College, University of Guelph; Guelph Ontario Canada
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74
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Kusumi K, Fisher RE. Studying mechanisms of regeneration in amphibian and reptilian vertebrate models. Anat Rec (Hoboken) 2012; 295:1529-31. [PMID: 22933304 DOI: 10.1002/ar.22541] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 07/07/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Kenro Kusumi
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA.
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75
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Alibardi L, Celeghin A, Dalla Valle L. Wounding in lizards results in the release of beta-defensins at the wound site and formation of an antimicrobial barrier. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2012; 36:557-565. [PMID: 22001772 DOI: 10.1016/j.dci.2011.09.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 09/20/2011] [Accepted: 09/21/2011] [Indexed: 05/31/2023]
Abstract
After tail loss in lizards no infections occur indicating the presence of an effective anti-microbial barrier in the exposed tissues of the tail stump. Previous molecular studies on the lizard Anolis carolinensis have identified some beta-defensin-like genes and the deduced peptides that may be involved in anti-infective protection. The present study has analyzed the tissues of wounded and normal tails in lizards in order to immune-localize one of the beta-defensins previously found (AcBD15) and to detect variation in its gene expression during wounding. No immunoreactivity for this beta-defensin is present in normal tissues or in the epidermis of lizards, except for some sparse granulocytes. The latter are seen during the first 1-6 days after tail amputation and AcBD15 immunoreactivity is present in their granules. Degenerating granulocytes are incorporated, together with dead erythrocytes, platelets and keratinocytes into the scab. Real time RT-PCR and western blotting analysis indicates up-regulation of AcBD15 expression during wounding with respect to normal tissues, indicating that production, storage and release of this beta-defensin from granulocytes are active following wounding. The production of beta-defensins from granulocytes would allow protection of exposed tissues from microbial invasion avoiding a persistent inflammation, a process that leads to tissue regeneration.
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Affiliation(s)
- Lorenzo Alibardi
- Comparative Histolab and Dipartimento di Biologia, University of Bologna, Italy.
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76
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Tzika AC, Helaers R, Schramm G, Milinkovitch MC. Reptilian-transcriptome v1.0, a glimpse in the brain transcriptome of five divergent Sauropsida lineages and the phylogenetic position of turtles. EvoDevo 2011; 2:19. [PMID: 21943375 PMCID: PMC3192992 DOI: 10.1186/2041-9139-2-19] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2011] [Accepted: 09/26/2011] [Indexed: 12/05/2022] Open
Abstract
Background Reptiles are largely under-represented in comparative genomics despite the fact that they are substantially more diverse in many respects than mammals. Given the high divergence of reptiles from classical model species, next-generation sequencing of their transcriptomes is an approach of choice for gene identification and annotation. Results Here, we use 454 technology to sequence the brain transcriptome of four divergent reptilian and one reference avian species: the Nile crocodile, the corn snake, the bearded dragon, the red-eared turtle, and the chicken. Using an in-house pipeline for recursive similarity searches of >3,000,000 reads against multiple databases from 7 reference vertebrates, we compile a reptilian comparative transcriptomics dataset, with homology assignment for 20,000 to 31,000 transcripts per species and a cumulated non-redundant sequence length of 248.6 Mbases. Our approach identifies the majority (87%) of chicken brain transcripts and about 50% of de novo assembled reptilian transcripts. In addition to 57,502 microsatellite loci, we identify thousands of SNP and indel polymorphisms for population genetic and linkage analyses. We also build very large multiple alignments for Sauropsida and mammals (two million residues per species) and perform extensive phylogenetic analyses suggesting that turtles are not basal living reptiles but are rather associated with Archosaurians, hence, potentially answering a long-standing question in the phylogeny of Amniotes. Conclusions The reptilian transcriptome (freely available at http://www.reptilian-transcriptomes.org) should prove a useful new resource as reptiles are becoming important new models for comparative genomics, ecology, and evolutionary developmental genetics.
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Affiliation(s)
- Athanasia C Tzika
- Laboratory of Artificial & Natural Evolution (LANE), Dept, of Genetics & Evolution, University of Geneva, Sciences III, 30, Quai Ernest-Ansermet, 1211 Genève 4, Switzerland.
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77
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McLean KE, Vickaryous MK. A novel amniote model of epimorphic regeneration: the leopard gecko, Eublepharis macularius. BMC DEVELOPMENTAL BIOLOGY 2011; 11:50. [PMID: 21846350 PMCID: PMC3180301 DOI: 10.1186/1471-213x-11-50] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Accepted: 08/16/2011] [Indexed: 11/25/2022]
Abstract
Background Epimorphic regeneration results in the restoration of lost tissues and structures from an aggregation of proliferating cells known as a blastema. Among amniotes the most striking example of epimorphic regeneration comes from tail regenerating lizards. Although tail regeneration is often studied in the context of ecological costs and benefits, details of the sequence of tissue-level events are lacking. Here we investigate the anatomical and histological events that characterize tail regeneration in the leopard gecko, Eublepharis macularius. Results Tail structure and tissue composition were examined at multiple days following tail loss, revealing a conserved pattern of regeneration. Removal of the tail results in a consistent series of morphological and histological events. Tail loss is followed by a latent period of wound healing with no visible signs of regenerative outgrowth. During this latent period basal cells of the epidermis proliferate and gradually cover the wound. An additional aggregation of proliferating cells accumulates adjacent to the distal tip of the severed spinal cord marking the first appearance of the blastema. Continued growth of the blastema is matched by the initiation of angiogenesis, followed by the re-development of peripheral axons and the ependymal tube of the spinal cord. Skeletal tissue differentiation, corresponding with the expression of Sox9, and muscle re-development are delayed until tail outgrowth is well underway. Conclusions We demonstrate that tail regeneration in lizards involves a highly conserved sequence of events permitting the establishment of a staging table. We show that tail loss is followed by a latent period of scar-free healing of the wound site, and that regeneration is blastema-mediated. We conclude that the major events of epimorphic regeneration are highly conserved across vertebrates and that a comparative approach is an invaluable biomedical tool for ongoing regenerative research.
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Affiliation(s)
- Katherine E McLean
- Department of Biomedical Sciences, University of Guelph, 50 Stone Road East, Guelph, Ontario, Canada
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Differential mRNA and tissue expression of lymphangiogenic growth factors (VEGF-C and -D) and their receptor (VEGFR-3) during tail regeneration in a gecko. J Comp Physiol B 2011; 182:109-26. [DOI: 10.1007/s00360-011-0604-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Revised: 06/28/2011] [Accepted: 07/04/2011] [Indexed: 10/17/2022]
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79
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Spinal cord repair in regeneration-competent vertebrates: adult teleost fish as a model system. ACTA ACUST UNITED AC 2010; 67:73-93. [PMID: 21059372 DOI: 10.1016/j.brainresrev.2010.11.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 10/26/2010] [Accepted: 11/01/2010] [Indexed: 12/28/2022]
Abstract
Spinal cord injuries in mammals, including humans, have devastating long-term consequences. Despite substantial research, therapeutic approaches developed in mammalian model systems have had limited success to date. An alternative strategy in the search for treatment of spinal cord lesions is provided by regeneration-competent vertebrates. These organisms, which include fish, urodele amphibians, and certain reptiles, have a spinal cord very similar in structure to that of mammals, but are capable of spontaneous structural and functional recovery after spinal cord injury. The present review aims to provide an overview of the current status of our knowledge of spinal cord regeneration in one of these groups, teleost fish. The findings are discussed from a comparative perspective, with reference to other taxa of regeneration-competent vertebrates, as well as to mammals.
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