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Clémot M, D’Alterio C, Kwang AC, Jones DL. mTORC1 is required for differentiation of germline stem cells in the Drosophila melanogaster testis. PLoS One 2024; 19:e0300337. [PMID: 38512882 PMCID: PMC10956854 DOI: 10.1371/journal.pone.0300337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 02/26/2024] [Indexed: 03/23/2024] Open
Abstract
Metabolism participates in the control of stem cell function and subsequent maintenance of tissue homeostasis. How this is achieved in the context of adult stem cell niches in coordination with other local and intrinsic signaling cues is not completely understood. The Target of Rapamycin (TOR) pathway is a master regulator of metabolism and plays essential roles in stem cell maintenance and differentiation. In the Drosophila male germline, mTORC1 is active in germline stem cells (GSCs) and early germ cells. Targeted RNAi-mediated downregulation of mTor in early germ cells causes a block and/or a delay in differentiation, resulting in an accumulation of germ cells with GSC-like features. These early germ cells also contain unusually large and dysfunctional autolysosomes. In addition, downregulation of mTor in adult male GSCs and early germ cells causes non-autonomous activation of mTORC1 in neighboring cyst cells, which correlates with a disruption in the coordination of germline and somatic differentiation. Our study identifies a previously uncharacterized role of the TOR pathway in regulating male germline differentiation.
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Affiliation(s)
- Marie Clémot
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States of America
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - Cecilia D’Alterio
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - Alexa C. Kwang
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - D. Leanne Jones
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States of America
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, United States of America
- Departments of Anatomy, Division of Geriatrics, University of California, San Francisco, San Francisco, CA, United States of America
- Departments of Medicine, Division of Geriatrics, University of California, San Francisco, San Francisco, CA, United States of America
- Eli and Edythe Broad Center for Regeneration Medicine, University of California, San Francisco, San Francisco, CA, United States of America
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Wang CW, Clémot M, Hashimoto T, Diaz JA, Goins LM, Goldstein AS, Nagaraj R, Banerjee U. A conserved mechanism for JNK-mediated loss of Notch function in advanced prostate cancer. Sci Signal 2023; 16:eabo5213. [PMID: 37934809 PMCID: PMC10802904 DOI: 10.1126/scisignal.abo5213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 10/19/2023] [Indexed: 11/09/2023]
Abstract
Dysregulated Notch signaling is a common feature of cancer; however, its effects on tumor initiation and progression are highly variable, with Notch having either oncogenic or tumor-suppressive functions in various cancers. To better understand the mechanisms that regulate Notch function in cancer, we studied Notch signaling in a Drosophila tumor model, prostate cancer-derived cell lines, and tissue samples from patients with advanced prostate cancer. We demonstrated that increased activity of the Src-JNK pathway in tumors inactivated Notch signaling because of JNK pathway-mediated inhibition of the expression of the gene encoding the Notch S2 cleavage protease, Kuzbanian, which is critical for Notch activity. Consequently, inactive Notch accumulated in cells, where it was unable to transcribe genes encoding its target proteins, many of which have tumor-suppressive activities. These findings suggest that Src-JNK activity in tumors predicts Notch activity status and that suppressing Src-JNK signaling could restore Notch function in tumors, offering opportunities for diagnosis and targeted therapies for a subset of patients with advanced prostate cancer.
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Affiliation(s)
- Cheng-Wei Wang
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
| | - Marie Clémot
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
| | - Takao Hashimoto
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
| | - Johnny A. Diaz
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
| | - Lauren M. Goins
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
| | - Andrew S. Goldstein
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
- Department of Urology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, USA
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, CA, USA
- Molecular Biology Institute; University of California, Los Angeles, Los Angeles, CA, USA
| | - Raghavendra Nagaraj
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
| | - Utpal Banerjee
- Department of Molecular, Cell and Developmental Biology; University of California, Los Angeles, Los Angeles, CA, USA
- Department of Biological Chemistry; University of California, Los Angeles, Los Angeles, CA, USA
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, USA
- Molecular Biology Institute; University of California, Los Angeles, Los Angeles, CA, USA
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Sênos Demarco R, Clémot M, Jones DL. The impact of ageing on lipid-mediated regulation of adult stem cell behavior and tissue homeostasis. Mech Ageing Dev 2020; 189:111278. [PMID: 32522455 DOI: 10.1016/j.mad.2020.111278] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 05/05/2020] [Accepted: 06/01/2020] [Indexed: 02/06/2023]
Abstract
Adult stem cells sustain tissue homeostasis throughout life and provide an important reservoir of cells capable of tissue repair in response to stress and tissue damage. Age-related changes to stem cells and/or the specialized niches that house them have been shown to negatively impact stem cell maintenance and activity. In addition, metabolic inputs have surfaced as another crucial layer in the control of stem cell behavior (Chandel et al., 2016; Folmes and Terzic, 2016; Ito and Suda, 2014; Mana et al., 2017; Shyh-Chang and Ng, 2017). Here, we will present a brief review of how lipid metabolism influences adult stem cell behavior under homeostatic conditions and speculate on how changes in lipid metabolism may impact stem cell ageing. This review considers the future of lipid metabolism research in stem cells, with the long-term goal of identifying mechanisms that could be targeted to counter or slow the age-related decline in stem cell function.
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Affiliation(s)
- Rafael Sênos Demarco
- Department of Molecular, Cell and Developmental Biology, Los Angeles, CA, 90095, USA
| | - Marie Clémot
- Department of Molecular, Cell and Developmental Biology, Los Angeles, CA, 90095, USA; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - D Leanne Jones
- Department of Molecular, Cell and Developmental Biology, Los Angeles, CA, 90095, USA; Molecular Biology Institute, Los Angeles, CA, 90095, USA; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
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Abstract
Adult stem cells constitute an important reservoir of self-renewing progenitor cells and are crucial for maintaining tissue and organ homeostasis. The capacity of stem cells to self-renew or differentiate can be attributed to distinct metabolic states, and it is now becoming apparent that metabolism plays instructive roles in stem cell fate decisions. Lipids are an extremely vast class of biomolecules, with essential roles in energy homeostasis, membrane structure and signaling. Imbalances in lipid homeostasis can result in lipotoxicity, cell death and diseases, such as cardiovascular disease, insulin resistance and diabetes, autoimmune disorders and cancer. Therefore, understanding how lipid metabolism affects stem cell behavior offers promising perspectives for the development of novel approaches to control stem cell behavior either in vitro or in patients, by modulating lipid metabolic pathways pharmacologically or through diet. In this review, we will first address how recent progress in lipidomics has created new opportunities to uncover stem-cell specific lipidomes. In addition, genetic and/or pharmacological modulation of lipid metabolism have shown the involvement of specific pathways, such as fatty acid oxidation (FAO), in regulating adult stem cell behavior. We will describe and compare findings obtained in multiple stem cell models in order to provide an assessment on whether unique lipid metabolic pathways may commonly regulate stem cell behavior. We will then review characterized and potential molecular mechanisms through which lipids can affect stem cell-specific properties, including self-renewal, differentiation potential or interaction with the niche. Finally, we aim to summarize the current knowledge of how alterations in lipid homeostasis that occur as a consequence of changes in diet, aging or disease can impact stem cells and, consequently, tissue homeostasis and repair.
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Affiliation(s)
- Marie Clémot
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, United States
| | - Rafael Sênos Demarco
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - D. Leanne Jones
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, CA, United States
- Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, United States
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Clémot M, Molla-Herman A, Mathieu J, Huynh JR, Dostatni N. The replicative histone chaperone CAF-1 is essential for the maintenance of identity and genome integrity in adult stem cells. Development 2018; 145:dev.161190. [DOI: 10.1242/dev.161190] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 07/20/2018] [Indexed: 12/14/2022]
Abstract
Chromatin packaging and modifications are important to define the identity of stem cells. How chromatin properties are retained over multiple cycles of stem cell replication, while generating differentiating progeny at the same time, remains a challenging question. The chromatin assembly factor CAF-1 is a conserved histone chaperone, which assembles histones H3 and H4 onto newly synthesized DNA during replication and repair. Here, we investigated the role of CAF-1 in the maintenance of germline stem cells (GSCs) in Drosophila ovaries. We depleted P180, the large subunit of CAF-1, in germ cells and found that it was required in GSCs to maintain their identity. In the absence of P180, GSCs still harbor stem cell properties but concomitantly express markers of differentiation. In addition, P180-depleted germ cells exhibit elevated levels of DNA damage and de-repression of the transposable I-element. These DNA damages activate p53- and Chk2-dependent checkpoints pathways, leading to cell death and female sterility. Altogether, our work demonstrates that chromatin dynamics mediated by CAF-1 play an important role in both the regulation of stem cell identity and genome integrity.
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Affiliation(s)
- Marie Clémot
- Institut Curie, PSL Research University, CNRS, Sorbonne Université, Nuclear Dynamics, Paris, France
| | - Anahi Molla-Herman
- Institut Curie, PSL Research University, CNRS, Inserm, Sorbonne Université, Genetics and Developmental Biology, Paris, France
| | - Juliette Mathieu
- Institut Curie, PSL Research University, CNRS, Inserm, Sorbonne Université, Genetics and Developmental Biology, Paris, France
| | - Jean-René Huynh
- Institut Curie, PSL Research University, CNRS, Inserm, Sorbonne Université, Genetics and Developmental Biology, Paris, France
| | - Nathalie Dostatni
- Institut Curie, PSL Research University, CNRS, Sorbonne Université, Nuclear Dynamics, Paris, France
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Ferraro T, Lucas T, Clémot M, De Las Heras Chanes J, Desponds J, Coppey M, Walczak AM, Dostatni N. New methods to image transcription in living fly embryos: the insights so far, and the prospects. Wiley Interdiscip Rev Dev Biol 2016; 5:296-310. [PMID: 26894441 PMCID: PMC5021148 DOI: 10.1002/wdev.221] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 10/28/2015] [Accepted: 10/30/2015] [Indexed: 11/08/2022]
Abstract
The regulation of transcription is a fundamental process underlying the determination of cell identity and its maintenance during development. In the last decades, most of the transcription factors, which have to be expressed at the right place and at the right time for the proper development of the fly embryo, have been identified. However, mostly because of the lack of methods to visualize transcription as the embryo develops, their coordinated spatiotemporal dynamics remains largely unexplored. Efforts have been made to decipher the transcription process with single molecule resolution at the single cell level. Recently, the fluorescent labeling of nascent RNA in developing fly embryos allowed the direct visualization of ongoing transcription at single loci within each nucleus. Together with powerful imaging and quantitative data analysis, these new methods provide unprecedented insights into the temporal dynamics of the transcription process and its intrinsic noise. Focusing on the Drosophila embryo, we discuss how the detection of single RNA molecules enhanced our comprehension of the transcription process and we outline the potential next steps made possible by these new imaging tools. In combination with genetics and theoretical analysis, these new imaging methods will aid the search for the mechanisms responsible for the robustness of development. For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Teresa Ferraro
- Institut Curie, PSL Research University, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France.,Ecole Normale Superieure, PSL Research University, Paris, France
| | - Tanguy Lucas
- Institut Curie, PSL Research University, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France
| | - Marie Clémot
- Institut Curie, PSL Research University, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France
| | - Jose De Las Heras Chanes
- Institut Curie, PSL Research University, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France
| | - Jonathan Desponds
- UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France.,Ecole Normale Superieure, PSL Research University, Paris, France
| | - Mathieu Coppey
- Institut Curie, PSL Research University, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France
| | - Aleksandra M Walczak
- UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France.,Ecole Normale Superieure, PSL Research University, Paris, France
| | - Nathalie Dostatni
- Institut Curie, PSL Research University, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France.,UMR3664/UMR168/UMR8549, CNRS, Paris, France
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