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Lee JR, Boothe T, Mauksch C, Thommen A, Rink JC. Epidermal turnover in the planarian Schmidtea mediterranea involves basal cell extrusion and intestinal digestion. Cell Rep 2024:114305. [PMID: 38906148 DOI: 10.1016/j.celrep.2024.114305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 03/21/2024] [Accepted: 05/15/2024] [Indexed: 06/23/2024] Open
Abstract
Planarian flatworms undergo continuous internal turnover, wherein old cells are replaced by the division progeny of adult pluripotent stem cells (neoblasts). How cell turnover is carried out at the organismal level remains an intriguing question in planarians and other systems. While previous studies have predominantly focused on neoblast proliferation, little is known about the processes that mediate cell loss during tissue homeostasis. Here, we use the planarian epidermis as a model to study the mechanisms of cell removal. We established a covalent dye-labeling assay and image analysis pipeline to quantify the cell turnover rate in the planarian epidermis. Our findings indicate that the ventral epidermis is highly dynamic and epidermal cells undergo internalization via basal extrusion, followed by a relocation toward the intestine and ultimately digestion by intestinal phagocytes. Overall, our study reveals a complex homeostatic process of cell clearance that may generally allow planarians to catabolize their own cells.
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Affiliation(s)
- Jun-Ru Lee
- Department of Tissue Dynamics and Regeneration, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, 37077 Göttingen, Germany; Graduate Center for Neurosciences, Biophysics, and Molecular Biosciences, University of Göttingen, 37077 Göttingen, Germany
| | - Tobias Boothe
- Department of Tissue Dynamics and Regeneration, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, 37077 Göttingen, Germany
| | - Clemens Mauksch
- Department of Tissue Dynamics and Regeneration, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, 37077 Göttingen, Germany
| | - Albert Thommen
- Cancer Metabolism Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Jochen C Rink
- Department of Tissue Dynamics and Regeneration, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, 37077 Göttingen, Germany; Faculty of Biology and Psychology, Georg-August-University, Göttingen, Germany.
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Jin B, Li N, Pang L, Xiao J, Lin Z, Li N, Dong Z, Chen G, Yu F, Liu D. Systematic identification and screening of functional long noncoding RNAs during planarian regeneration. J Genet Genomics 2023; 50:1018-1021. [PMID: 37619943 DOI: 10.1016/j.jgg.2023.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 08/14/2023] [Accepted: 08/14/2023] [Indexed: 08/26/2023]
Affiliation(s)
- Baijie Jin
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Nannan Li
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Lina Pang
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Jing Xiao
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Ziyi Lin
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Ning Li
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Zimei Dong
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Guangwen Chen
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Fei Yu
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Dezeng Liu
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
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Jin B, Li X, Zhang Q, Zhou W, Liu Y, Dong Z, Chen G, Liu D. Toxicity assessment of microcystin-leucine arginine in planarian Dugesia japonica. Integr Zool 2023. [PMID: 37849408 DOI: 10.1111/1749-4877.12780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2023]
Abstract
Microcystin-leucine arginine (MC-LR), a representative cyanobacterial toxin, poses an increasing and serious threat to aquatic ecosystems. Despite investigating its toxic effects in various organisms and cells, the toxicity to tissue regeneration and stem cells in vivo still needs to be explored. Planarians are ideal regeneration and toxicology research models and have profound implications in ecotoxicology evaluation. This study conducted a systemic toxicity evaluation of MC-LR, including morphological changes, growth, regeneration, and the underlying cellular and molecular changes after MC-LR exposure, which were investigated in planarians. The results showed that exposure to MC-LR led to time- and dose-dependent lethal morphological changes, tissue damage, degrowth, and delayed regeneration in planarians. Furthermore, MC-LR exposure disturbed the activities of antioxidants, including total superoxide dismutase, catalase, glutathione peroxidase, glutathione S-transferase, and total antioxidant capacity, leading to oxidative stress and DNA damage, and then reduced the number of dividing neoblasts and promoted apoptosis. The results demonstrated that oxidative stress and DNA damage induced by MC-LR exposure caused apoptosis. Excessive apoptosis and suppressed neoblast activity led to severe homeostasis imbalance. This study explores the underlying mechanism of MC-LR toxicity in planarians and provides a basis for the toxicity assessment of MC-LR to aquatic organisms and ecological risk evaluation.
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Affiliation(s)
- Baijie Jin
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Xiangjun Li
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Qingling Zhang
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Wen Zhou
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Yingyu Liu
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Zimei Dong
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Guangwen Chen
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
| | - Dezeng Liu
- College of Life Science, Henan Normal University, Xinxiang, Henan, China
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Planarians to schistosomes: an overview of flatworm cell-types and regulators. J Helminthol 2023; 97:e7. [PMID: 36644809 DOI: 10.1017/s0022149x22000621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Schistosomiasis remains a major neglected tropical disease that afflicts over 200 million people globally. Schistosomes, the aetiological agent of schistosomiasis, are parasitic flatworms that propagate between molluscan and mammalian hosts. Inside the mammalian host, schistosomes rapidly grow over 100-fold in size and develop into a sexually mature male or female that thrives in the bloodstream for several decades. Recent work has identified schistosome stem cells as the source that drives parasite transmission, reproduction and longevity. Moreover, studies have begun to uncover molecular programmes deployed by stem cells that are essential for tissue development and maintenance, parasite survival and immune evasion. Such programmes are reminiscent of neoblast-driven development and regeneration of planarians, the free-living flatworm relative of schistosomes. Over the last few decades, research in planarians has employed modern functional genomic tools that significantly enhanced our understanding of stem cell-driven animal development and regeneration. In this review, we take a broad stroke overview of major flatworm organ systems at the cellular and molecular levels. We summarize recent advances on genetic regulators that play critical roles in differentiation and maintenance of flatworm cell types. Finally, we provide perspectives on how investigation of basic parasite biology is critical to discovering new approaches to battle schistosomiasis.
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Ge XY, Han X, Zhao YL, Cui GS, Yang YG. An insight into planarian regeneration. Cell Prolif 2022; 55:e13276. [PMID: 35811385 PMCID: PMC9436907 DOI: 10.1111/cpr.13276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/22/2022] [Accepted: 05/17/2022] [Indexed: 11/29/2022] Open
Abstract
Background Planarian has attracted increasing attentions in the regeneration field for its usefulness as an important biological model organism attributing to its strong regeneration ability. Both the complexity of multiple regulatory networks and their coordinate functions contribute to the maintenance of normal cellular homeostasis and the process of regeneration in planarian. The polarity, size, location and number of regeneration tissues are regulated by diverse mechanisms. In this review we summarize the recent advances about the importance genetic and molecular mechanisms for regeneration control on various tissues in planarian. Methods A comprehensive literature search of original articles published in recent years was performed in regards to the molecular mechanism of each cell types during the planarian regeneration, including neoblast, nerve system, eye spot, excretory system and epidermal. Results Available molecular mechanisms gave us an overview of regeneration process in every tissue. The sense of injuries and initiation of regeneration is regulated by diverse genes like follistatin and ERK signaling. The Neoblasts differentiate into tissue progenitors under the regulation of genes such as egfr‐3. The regeneration polarity is controlled by Wnt pathway, BMP pathway and bioelectric signals. The neoblast within the blastema differentiate into desired cell types and regenerate the missing tissues. Those tissue specific genes regulate the tissue progenitor cells to differentiate into desired cell types to complete the regeneration process. Conclusion All tissue types in planarian participate in the regeneration process regulated by distinct molecular factors and cellular signaling pathways. The neoblasts play vital roles in tissue regeneration and morphology maintenance. These studies provide new insights into the molecular mechanisms for regulating planarian regeneration.
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Affiliation(s)
- Xin-Yang Ge
- CAS Key Laboratory of Genomic and Precision Medicine, Collaborative Innovation Center of Genetics and Development, College of Future Technology, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.,Sino-Danish College, University of Chinese Academy of Sciences, Beijing, China.,China National Center for Bioinformation, Beijing, China
| | - Xiao Han
- Center for Reproductive Medicine, Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yong-Liang Zhao
- CAS Key Laboratory of Genomic and Precision Medicine, Collaborative Innovation Center of Genetics and Development, College of Future Technology, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.,Sino-Danish College, University of Chinese Academy of Sciences, Beijing, China.,China National Center for Bioinformation, Beijing, China
| | - Guan-Shen Cui
- CAS Key Laboratory of Genomic and Precision Medicine, Collaborative Innovation Center of Genetics and Development, College of Future Technology, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.,China National Center for Bioinformation, Beijing, China
| | - Yun-Gui Yang
- CAS Key Laboratory of Genomic and Precision Medicine, Collaborative Innovation Center of Genetics and Development, College of Future Technology, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.,Sino-Danish College, University of Chinese Academy of Sciences, Beijing, China.,China National Center for Bioinformation, Beijing, China
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Transcription Factors Active in the Anterior Blastema of Schmidtea mediterranea. Biomolecules 2021; 11:biom11121782. [PMID: 34944426 PMCID: PMC8698962 DOI: 10.3390/biom11121782] [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: 09/16/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 12/28/2022] Open
Abstract
Regeneration, the restoration of body parts after injury, is quite widespread in the animal kingdom. Species from virtually all Phyla possess regenerative abilities. Human beings, however, are poor regenerators. Yet, the progress of knowledge and technology in the fields of bioengineering, stem cells, and regenerative biology have fostered major advancements in regenerative medical treatments, which aim to regenerate tissues and organs and restore function. Human induced pluripotent stem cells can differentiate into any cell type of the body; however, the structural and cellular complexity of the human tissues, together with the inability of our adult body to control pluripotency, require a better mechanistic understanding. Planarians, with their capacity to regenerate lost body parts thanks to the presence of adult pluripotent stem cells could help providing such an understanding. In this paper, we used a top-down approach to shortlist blastema transcription factors (TFs) active during anterior regeneration. We found 44 TFs—31 of which are novel in planarian—that are expressed in the regenerating blastema. We analyzed the function of half of them and found that they play a role in the regeneration of anterior structures, like the anterior organizer, the positional instruction muscle cells, the brain, the photoreceptor, the intestine. Our findings revealed a glimpse of the complexity of the transcriptional network governing anterior regeneration in planarians, confirming that this animal model is the perfect playground to study in vivo how pluripotency copes with adulthood.
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Molina MD, Cebrià F. Decoding Stem Cells: An Overview on Planarian Stem Cell Heterogeneity and Lineage Progression. Biomolecules 2021; 11:1532. [PMID: 34680165 PMCID: PMC8533874 DOI: 10.3390/biom11101532] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 01/26/2023] Open
Abstract
Planarians are flatworms capable of whole-body regeneration, able to regrow any missing body part after injury or amputation. The extraordinary regenerative capacity of planarians is based upon the presence in the adult of a large population of somatic pluripotent stem cells. These cells, called neoblasts, offer a unique system to study the process of stem cell specification and differentiation in vivo. In recent years, FACS-based isolation of neoblasts, RNAi functional analyses as well as high-throughput approaches such as single-cell sequencing have allowed a rapid progress in our understanding of many different aspects of neoblast biology. Here, we summarize our current knowledge on the molecular signatures that define planarian neoblasts heterogeneity, which includes a percentage of truly pluripotent stem cells, and guide the commitment of pluripotent neoblasts into lineage-specific progenitor cells, as well as their differentiation into specific planarian cell types.
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Affiliation(s)
- M. Dolores Molina
- Department of Genetics, Microbiology and Statistics, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain
- Institute of Biomedicine of the University of Barcelona (IBUB), 08028 Barcelona, Spain
| | - Francesc Cebrià
- Department of Genetics, Microbiology and Statistics, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain
- Institute of Biomedicine of the University of Barcelona (IBUB), 08028 Barcelona, Spain
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