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Riquelme-Guzmán C, Sandoval-Guzmán T. The salamander limb: a perfect model to understand imperfect integration during skeletal regeneration. Biol Open 2024; 13:bio060152. [PMID: 38319134 PMCID: PMC10868587 DOI: 10.1242/bio.060152] [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] [Indexed: 02/07/2024] Open
Abstract
Limb regeneration in salamanders is achieved by a complex coordination of various biological processes and requires the proper integration of new tissue with old. Among the tissues found inside the limb, the skeleton is the most prominent component, which serves as a scaffold and provides support for locomotion in the animal. Throughout the years, researchers have studied the regeneration of the appendicular skeleton in salamanders both after limb amputation and as a result of fracture healing. The final outcome has been widely seen as a faithful re-establishment of the skeletal elements, characterised by a seamless integration into the mature tissue. The process of skeletal integration, however, is not well understood, and several works have recently provided evidence of commonly occurring flawed regenerates. In this Review, we take the reader on a journey through the course of bone formation and regeneration in salamanders, laying down a foundation for critically examining the mechanisms behind skeletal integration. Integration is a phenomenon that could be influenced at various steps of regeneration, and hence, we assess the current knowledge in the field and discuss how early events, such as tissue histolysis and patterning, influence the faithful regeneration of the appendicular skeleton.
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Affiliation(s)
- Camilo Riquelme-Guzmán
- Department of Internal Medicine 3, Center for Healthy Aging, University Hospital Carl Gustav Carus at the Technische Universität Dresden, 01307 Dresden, Germany
| | - Tatiana Sandoval-Guzmán
- Department of Internal Medicine 3, Center for Healthy Aging, University Hospital Carl Gustav Carus at the Technische Universität Dresden, 01307 Dresden, Germany
- Paul Langerhans Institute Dresden of Helmholtz Centre Munich, University Hospital Carl Gustav Carus at the Technische Universität Dresden, 01307 Dresden, Germany
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Alstrup AKO, Busk M, Dittrich A, Hansen K, Wang T, Damkjær M, Andersen JB, Lauridsen H. Special Challenges in PET Imaging of Ectothermic Vertebrates. Semin Nucl Med 2023; 53:577-585. [PMID: 37438172 DOI: 10.1053/j.semnuclmed.2023.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 06/18/2023] [Indexed: 07/14/2023]
Abstract
The bulk of biomedical positron emission tomography (PET)-scanning experiments are performed on mammals (ie, rodents, pigs, and dogs), and the technique is only infrequently applied to answer research questions in ectothermic vertebrates such as fish, amphibians, and reptiles. Nevertheless, many unique and interesting physiological characteristics in these ectothermic vertebrates could be addressed in detail through PET. The low metabolic rate of ectothermic animals, however, may compromise the validity of physiological and biochemical parameters derived from the images created by PET and other scanning modalities. Here, we review some of the considerations that should be taken into account when PET scanning fish, amphibians, and reptiles. We present specific results from our own experiments, many of which remain previously unpublished, and we draw on examples from the literature. We conclude that knowledge on the natural history and physiology of the species studied and an understanding of the limitations of the PET scanning techniques are necessary to avoid the design of faulty experiments and erroneous conclusions.
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Affiliation(s)
- Aage Kristian Olsen Alstrup
- Department of Nuclear Medicine and PET, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
| | - Morten Busk
- Experimental Clinical Oncology, Aarhus University, Denmark; Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
| | - Anita Dittrich
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Kasper Hansen
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; Department of Forensic Medicine, Aarhus University, Aarhus, Denmark; Zoophysiology, Department of Biology, Aarhus University, Aarhus, Denmark
| | - Tobias Wang
- Zoophysiology, Department of Biology, Aarhus University, Aarhus, Denmark
| | - Mads Damkjær
- Department of Paediatrics and Adolescent Medicine, Lillebaelt Hospital, University Hospital of Southern Denmark, Kolding, Denmark; Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
| | | | - Henrik Lauridsen
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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