1
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Li Y, Jin H, Li Q, Shi L, Mao Y, Zhao L. The role of RNA methylation in tumor immunity and its potential in immunotherapy. Mol Cancer 2024; 23:130. [PMID: 38902779 PMCID: PMC11188252 DOI: 10.1186/s12943-024-02041-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Accepted: 06/10/2024] [Indexed: 06/22/2024] Open
Abstract
RNA methylation, a prevalent post-transcriptional modification, has garnered considerable attention in research circles. It exerts regulatory control over diverse biological functions by modulating RNA splicing, translation, transport, and stability. Notably, studies have illuminated the substantial impact of RNA methylation on tumor immunity. The primary types of RNA methylation encompass N6-methyladenosine (m6A), 5-methylcytosine (m5C), N1-methyladenosine (m1A), and N7-methylguanosine (m7G), and 3-methylcytidine (m3C). Compelling evidence underscores the involvement of RNA methylation in regulating the tumor microenvironment (TME). By affecting RNA translation and stability through the "writers", "erasers" and "readers", RNA methylation exerts influence over the dysregulation of immune cells and immune factors. Consequently, RNA methylation plays a pivotal role in modulating tumor immunity and mediating various biological behaviors, encompassing proliferation, invasion, metastasis, etc. In this review, we discussed the mechanisms and functions of several RNA methylations, providing a comprehensive overview of their biological roles and underlying mechanisms within the tumor microenvironment and among immunocytes. By exploring how these RNA modifications mediate tumor immune evasion, we also examine their potential applications in immunotherapy. This review aims to provide novel insights and strategies for identifying novel targets in RNA methylation and advancing cancer immunotherapy efficacy.
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Affiliation(s)
- Yan Li
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Pathology, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Haoer Jin
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Pathology, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Qingling Li
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Pathology, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Liangrong Shi
- Department of Radiology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yitao Mao
- Department of Radiology, Xiangya Hospital, Central South University, Changsha, Hunan, China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China.
| | - Luqing Zhao
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China.
- Department of Pathology, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, Hunan, China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China.
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2
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Garfinkel AM, Ilker E, Miyazawa H, Schmeisser K, Tennessen JM. Historic obstacles and emerging opportunities in the field of developmental metabolism - lessons from Heidelberg. Development 2024; 151:dev202937. [PMID: 38912552 PMCID: PMC11299503 DOI: 10.1242/dev.202937] [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: 06/25/2024]
Abstract
The field of developmental metabolism is experiencing a technological revolution that is opening entirely new fields of inquiry. Advances in metabolomics, small-molecule sensors, single-cell RNA sequencing and computational modeling present new opportunities for exploring cell-specific and tissue-specific metabolic networks, interorgan metabolic communication, and gene-by-metabolite interactions in time and space. Together, these advances not only present a means by which developmental biologists can tackle questions that have challenged the field for centuries, but also present young scientists with opportunities to define new areas of inquiry. These emerging frontiers of developmental metabolism were at the center of a highly interactive 2023 EMBO workshop 'Developmental metabolism: flows of energy, matter, and information'. Here, we summarize key discussions from this forum, emphasizing modern developmental biology's challenges and opportunities.
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Affiliation(s)
- Alexandra M. Garfinkel
- Pediatric Genomics Discovery Program, Department of Pediatrics and Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
- Section of Endocrinology, Department of Internal Medicine, Yale University, New Haven, CT 06510, USA
| | - Efe Ilker
- Max Planck Institute for the Physics of Complex Systems, Dresden 01187, Germany
| | - Hidenobu Miyazawa
- Developmental Biology Unit, European Molecular Biology Laboratory, Heidelberg 69117, Germany
| | - Kathrin Schmeisser
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden 01307, Germany
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3
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Heidarian Y, Tourigny JP, Fasteen TD, Mahmoudzadeh NH, Hurlburt AJ, Nemkov T, Reisz JA, D’Alessandro A, Tennessen JM. Metabolomic analysis of Drosophila melanogaster larvae lacking pyruvate kinase. G3 (BETHESDA, MD.) 2023; 14:jkad228. [PMID: 37792629 PMCID: PMC10755183 DOI: 10.1093/g3journal/jkad228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 06/02/2023] [Accepted: 09/24/2023] [Indexed: 10/06/2023]
Abstract
Pyruvate kinase (Pyk) is a rate-limiting enzyme that catalyzes the final metabolic reaction in glycolysis. The importance of this enzyme, however, extends far beyond ATP production, as Pyk is also known to regulate tissue growth, cell proliferation, and development. Studies of this enzyme in Drosophila melanogaster are complicated by the fact that the fly genome encodes 6 Pyk paralogs whose functions remain poorly defined. To address this issue, we used sequence distance and phylogenetic approaches to demonstrate that the gene Pyk encodes the enzyme most similar to the mammalian Pyk orthologs, while the other 5 Drosophila Pyk paralogs have significantly diverged from the canonical enzyme. Consistent with this observation, metabolomic studies of 2 different Pyk mutant strains revealed that larvae lacking Pyk exhibit a severe block in glycolysis, with a buildup of glycolytic intermediates upstream of pyruvate. However, our analysis also unexpectedly reveals that pyruvate levels are unchanged in Pyk mutants, indicating that larval metabolism maintains pyruvate pool size despite severe metabolic limitations. Consistent with our metabolomic findings, a complementary RNA-seq analysis revealed that genes involved in lipid metabolism and protease activity are elevated in Pyk mutants, again indicating that loss of this glycolytic enzyme induces compensatory changes in other aspects of metabolism. Overall, our study provides both insight into how Drosophila larval metabolism adapts to disruption of glycolytic metabolism as well as immediate clinical relevance, considering that Pyk deficiency is the most common congenital enzymatic defect in humans.
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Affiliation(s)
- Yasaman Heidarian
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | - Jason P Tourigny
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | - Tess D Fasteen
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | | | | | - Travis Nemkov
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Julie A Reisz
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Angelo D’Alessandro
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Jason M Tennessen
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
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4
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Heidarian Y, Tourigny JP, Fasteen TD, Mahmoudzadeh NH, Hurlburt AJ, Nemkov T, Reisz JA, D'Alessandro A, Tennessen JM. Metabolomic analysis of Drosophila melanogaster larvae lacking Pyruvate kinase. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.05.543743. [PMID: 37333180 PMCID: PMC10274742 DOI: 10.1101/2023.06.05.543743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Pyruvate kinase (Pyk) is a rate-limiting enzyme that catalyzes the final metabolic reaction in glycolysis. The importance of this enzyme, however, extends far beyond ATP production, as Pyk is also known to regulate tissue growth, cell proliferation, and development. Studies of this enzyme in Drosophila melanogaster , however, are complicated by the fact that the fly genome encodes six Pyk paralogs whose functions remain poorly defined. To address this issue, we used sequence distance and phylogenetic approaches to demonstrate that the gene Pyk encodes the enzyme most similar to the mammalian Pyk orthologs, while the other five Drosophila Pyk paralogs have significantly diverged from the canonical enzyme. Consistent with this observation, metabolomic studies of two different Pyk mutant backgrounds revealed that larvae lacking Pyk exhibit a severe block in glycolysis, with a buildup of glycolytic intermediates upstream of pyruvate. However, our analysis also unexpectedly reveals that steady state pyruvate levels are unchanged in Pyk mutants, indicating that larval metabolism maintains pyruvate pool size despite severe metabolic limitations. Consistent with our metabolomic findings, a complementary RNA-seq analysis revealed that genes involved in lipid metabolism and peptidase activity are elevated in Pyk mutants, again indicating that loss of this glycolytic enzyme induces compensatory changes in other aspects of metabolism. Overall, our study provides both insight into how Drosophila larval metabolism adapts to disruption of glycolytic metabolism as well as immediate clinical relevance, considering that Pyk deficiency is the most common congenital enzymatic defect in humans.
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Affiliation(s)
- Yasaman Heidarian
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | - Jason P Tourigny
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | - Tess D Fasteen
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | | | | | - Travis Nemkov
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Julie A Reisz
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Angelo D'Alessandro
- Department of Biochemistry and Molecular Genetics, Anschutz Medical Campus, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Jason M Tennessen
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
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Nellas I, Iyer KV, Iglesias‐Artola JM, Pippel M, Nadler A, Eaton S, Dye NA. Hedgehog signaling can enhance glycolytic ATP production in the Drosophila wing disc. EMBO Rep 2022; 23:e54025. [PMID: 36134875 PMCID: PMC9638854 DOI: 10.15252/embr.202154025] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 08/02/2022] [Accepted: 08/22/2022] [Indexed: 09/08/2024] Open
Abstract
Adenosine triphosphate (ATP) production and utilization is critically important for animal development. How these processes are regulated in space and time during tissue growth remains largely unclear. We used a FRET-based sensor to dynamically monitor ATP levels across a growing tissue, using the Drosophila larval wing disc. Although steady-state levels of ATP are spatially uniform across the wing pouch, inhibiting oxidative phosphorylation reveals spatial differences in metabolic behavior, whereby signaling centers at compartment boundaries produce more ATP from glycolysis than the rest of the tissue. Genetic perturbations indicate that the conserved Hedgehog signaling pathway can enhance ATP production by glycolysis. Collectively, our work suggests the existence of a homeostatic feedback loop between Hh signaling and glycolysis, advancing our understanding of the connection between conserved developmental patterning genes and ATP production during animal tissue development.
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Affiliation(s)
- Ioannis Nellas
- Max Planck Institute for Molecular Cell Biology and GeneticsDresdenGermany
- Excellence Cluster, Physics of LifeTechnische Universität DresdenDresdenGermany
| | - K Venkatesan Iyer
- Max Planck Institute for Molecular Cell Biology and GeneticsDresdenGermany
- Department of Mechanical EngineeringIndian Institute of ScienceBangaloreIndia
| | | | - Martin Pippel
- Max Planck Institute for Molecular Cell Biology and GeneticsDresdenGermany
- Center for Systems Biology DresdenDresdenGermany
| | - André Nadler
- Max Planck Institute for Molecular Cell Biology and GeneticsDresdenGermany
| | - Suzanne Eaton
- Max Planck Institute for Molecular Cell Biology and GeneticsDresdenGermany
- Excellence Cluster, Physics of LifeTechnische Universität DresdenDresdenGermany
- Center for Systems Biology DresdenDresdenGermany
- Biotechnologisches ZentrumTechnische Universität DresdenDresdenGermany
| | - Natalie A Dye
- Max Planck Institute for Molecular Cell Biology and GeneticsDresdenGermany
- Excellence Cluster, Physics of LifeTechnische Universität DresdenDresdenGermany
- Mildred Scheel Nachwuchszentrum (MSNZ) P2, Medical FacultyTechnische Universität DresdenDresdenGermany
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6
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Yao Y, Wang Y, Yang F, Wang C, Mao M, Gai Q, He J, Qin Y, Yao X, Lan X, Zhu J, Lu H, Zeng H, Yao X, Bian X, Wang Y. Targeting AKT and CK2 represents a novel therapeutic strategy for SMO constitutive activation-driven medulloblastoma. CNS Neurosci Ther 2022; 28:1033-1044. [PMID: 35419951 PMCID: PMC9160449 DOI: 10.1111/cns.13835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/17/2022] [Accepted: 03/20/2022] [Indexed: 11/29/2022] Open
Abstract
AIMS Sonic hedgehog subtype medulloblastoma is featured with overactivation of hedgehog pathway and can be targeted by SMO-specific inhibitors. However, the resistance is frequently developed leading to treatment failure of SMO inhibitors. W535L mutation of SMO (SMOW535L ) is thought to be an oncogenic driver for Sonic hedgehog subtype MB and confer resistance to SMO inhibitors. The regulation network of SMOW535L remains to be explored in comparison with wild-type SMO (SMOWT ). METHODS In this study, we profiled transcriptomes, methylomes, and interactomes of MB cells expression SMOWT or SMOW535L in the treatment of DMSO or SMO inhibitor, respectively. RESULTS Analysis of transcriptomic data indicated that SMO inhibitor disrupted processes of endocytosis and cilium organization in MB cells with SMOWT , which are necessary for SMO activation. In MB cells with SMOW535L , however, SMO inhibitor did not affect the two processes-related genes, implying resistance of SMOW535L toward SMO inhibitor. Moreover, we noticed that SMO inhibitor significantly inhibited metabolism-related pathways. Our metabolic analysis indicated that nicotinate and nicotinamide metabolism, glycerolipid metabolism, beta-alanine metabolism, and synthesis and degradation of ketone bodies might be involved in SMOW535L function maintenance. Interactomic analysis revealed casein kinase II (CK2) as an important SMO-associated protein. Finally, we linked CK2 and AKT together and found combination of inhibitors targeting CK2 and AKT showed synergetic effects to inhibit the growth of MB cells with SMO constitutive activation mutation. CONCLUSIONS Taken together, our work described SMO-related transcriptomes, metabolomes, and interactomes under different SMO status and treatment conditions, identifying CK2 and AKT as therapeutic targets for SHH-subtype MB cells with SMO inhibitor resistance.
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Affiliation(s)
- Yue‐Liang Yao
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
- Fuzhou Medical College of Nanchang UniversityFuzhouChina
| | - Yan‐Xia Wang
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Fei‐Cheng Yang
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Chuan Wang
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Min Mao
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Qu‐Jing Gai
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Jiang He
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Yan Qin
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Xiao‐Xue Yao
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Xi Lan
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Jiang Zhu
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Hui‐Min Lu
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Hui Zeng
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Xiao‐Hong Yao
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Xiu‐Wu Bian
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
| | - Yan Wang
- Institute of Pathology and Southwest Cancer CenterSouthwest HospitalArmy Medical University (Third Military Medical University)ChongqingChina
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Abstract
Metabolic reprogramming is one of the main characteristics of malignant tumors, which is due to the flexible changes of cell metabolism that can meet the needs of cell growth and maintain the homeostasis of tissue environments. Cancer cells can obtain metabolic adaptation through a variety of endogenous and exogenous signaling pathways, which can not only promote the growth of malignant cancer cells, but also start the transformation process of cells to adapt to tumor microenvironment. Studies show that m6A RNA methylation is widely involved in the metabolic recombination of tumor cells. In eukaryotes, m6A methylation is the most abundant modification in mRNA, which is involved in almost all the RNA cycle stages, including regulation the transcription, maturation, translation, degradation and stability of mRNA. M6A RNA methylation can be involved in the regulation of physiological and pathological processes, including cancer. In this review, we discuss the role of m6A RNA methylation modification plays in tumor metabolism-related molecules and pathways, aiming to show the importance of targeting m6A in regulating tumor metabolism.
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Affiliation(s)
- Yuanyuan An
- Gynecological Mini-Invasive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, 17 Qihelou Street, Dongcheng District, Beijing, 100006 China
| | - Hua Duan
- Gynecological Mini-Invasive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, 17 Qihelou Street, Dongcheng District, Beijing, 100006 China
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8
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Gradilla AC, Guerrero I. Hedgehog on track: Long-distant signal transport and transfer through direct cell-to-cell contact. Curr Top Dev Biol 2022; 150:1-24. [DOI: 10.1016/bs.ctdb.2022.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Dye NA. Cultivation and Live Imaging of Drosophila Imaginal Discs. Methods Mol Biol 2022; 2540:317-334. [PMID: 35980586 DOI: 10.1007/978-1-0716-2541-5_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this chapter, I present a method for the ex vivo cultivation and live imaging of Drosophila imaginal disc explants using low concentrations of the steroid hormone 20-hydroxyecdysone (20E). This method has been optimized for analyzing cellular dynamics during wing disc growth and leverages recent insights from in vivo experiments demonstrating that 20E is required for growth and patterning of the imaginal tissues. Using this protocol, we directly observe wing disc proliferation at a rapid rate for at least 13 h during live imaging. The orientation of tissue growth is also consistent with that inferred from indirect in vivo techniques. Thus, this method provides an improved way of studying dynamic cellular processes and tissue movements during imaginal disc development. I first describe the preparation of the growth medium and the dissection, and then I include a protocol for mounting and live imaging of the explants.
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Affiliation(s)
- Natalie A Dye
- Mildred Scheel Nachwuchszentrum (MSNZ) P2 & Cluster of Excellence Physics of Life, Technische Universität Dresden, Dresden, Germany.
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10
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A Note of Caution: Gramicidin Affects Signaling Pathways Independently of Its Effects on Plasma Membrane Conductance. BIOMED RESEARCH INTERNATIONAL 2021; 2021:2641068. [PMID: 34722759 PMCID: PMC8553451 DOI: 10.1155/2021/2641068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 10/06/2021] [Accepted: 10/09/2021] [Indexed: 12/01/2022]
Abstract
Gramicidin is a thoroughly studied cation ionophore widely used to experimentally manipulate the plasma membrane potential (PMP). In addition, it has been established that the drug, due to its hydrophobic nature, is capable of affecting the organization of membrane lipids. We have previously shown that modifications in the plasma membrane potential of epithelial cells in culture determine reorganizations of the cytoskeleton. To elucidate the molecular mechanisms involved, we explored the effects of PMP depolarization on some putative signaling intermediates. In the course of these studies, we came across some results that could not be interpreted in terms of the properties of gramicidin as an ionic channel. The purpose of the present work is to communicate these results and, in general, to draw attention to the fact that gramicidin effects can be misleadingly attributed to its ionic or electrical properties. In addition, this work also contributes with some novel findings of the modifications provoked on the signaling intermediates by PMP depolarization and hyperpolarization.
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11
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Lazzari-Dean JR, Miller EW. Optical Estimation of Absolute Membrane Potential Using One- and Two-Photon Fluorescence Lifetime Imaging Microscopy. Bioelectricity 2021; 3:197-203. [PMID: 34734167 DOI: 10.1089/bioe.2021.0007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Background: Membrane potential (V mem) exerts physiological influence across a wide range of time and space scales. To study V mem in these diverse contexts, it is essential to accurately record absolute values of V mem, rather than solely relative measurements. Materials and Methods: We use fluorescence lifetime imaging of a small molecule voltage sensitive dye (VF2.1.Cl) to estimate mV values of absolute membrane potential. Results: We test the consistency of VF2.1.Cl lifetime measurements performed on different single-photon counting instruments and find that they are in striking agreement (differences of <0.5 ps/mV in the slope and <50 ps in the y-intercept). We also demonstrate that VF2.1.Cl lifetime reports absolute V mem under two-photon (2P) illumination with better than 20 mV of V mem resolution, a nearly 10-fold improvement over other lifetime-based methods. Conclusions: We demonstrate that VF-FLIM is a robust and portable metric for V mem across imaging platforms and under both one-photon and 2P illumination. This work is a critical foundation for application of VF-FLIM to record absolute membrane potential signals in thick tissue.
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Affiliation(s)
- Julia R Lazzari-Dean
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA
| | - Evan W Miller
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA.,Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, USA.,Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California, USA
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12
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Mateus R, Fuhrmann JF, Dye NA. Growth across scales: Dynamic signaling impacts tissue size and shape. Curr Opin Cell Biol 2021; 73:50-57. [PMID: 34182209 DOI: 10.1016/j.ceb.2021.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 05/06/2021] [Indexed: 12/20/2022]
Abstract
Organ and tissue growth result from an integration of biophysical communication across biological scales, both in time and space. In this review, we highlight new insight into the dynamic connections between control mechanisms operating at different length scales. First, we consider how the dynamics of chemical and electrical signaling in the shape of gradients or waves affect spatiotemporal signal interpretation. Then, we discuss the mechanics underlying dynamic cell behavior during oriented tissue growth, followed by the connections between signaling at the tissue and organismal levels.
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Affiliation(s)
- Rita Mateus
- Max Planck Institute for Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany; Cluster of Excellence Physics of Life, Technische Universität Dresden, 01062 Dresden, Germany.
| | - Jana F Fuhrmann
- Max Planck Institute for Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany
| | - Natalie A Dye
- Max Planck Institute for Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany; Cluster of Excellence Physics of Life, Technische Universität Dresden, 01062 Dresden, Germany; Mildred Scheel Nachwuchszentrum (MSNZ) P2, Medical Faculty, Technische Universität Dresden, Germany.
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13
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Spannl S, Buhl T, Nellas I, Zeidan SA, Venkatesan Iyer K, Khaliullina H, Schultz C, Nadler A, Dye NA, Eaton S. Glycolysis regulates Hedgehog signalling via the plasma membrane potential. EMBO J 2021; 40:e107925. [PMID: 33792087 PMCID: PMC8013834 DOI: 10.15252/embj.2021107925] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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14
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Emmons-Bell M, Hariharan IK. Membrane potential regulates Hedgehog signalling in the Drosophila wing imaginal disc. EMBO Rep 2021; 22:e51861. [PMID: 33629503 PMCID: PMC8024891 DOI: 10.15252/embr.202051861] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/29/2020] [Accepted: 01/15/2021] [Indexed: 01/02/2023] Open
Abstract
While the membrane potential of cells has been shown to be patterned in some tissues, specific roles for membrane potential in regulating signalling pathways that function during development are still being established. In the Drosophila wing imaginal disc, Hedgehog (Hh) from posterior cells activates a signalling pathway in anterior cells near the boundary which is necessary for boundary maintenance. Here, we show that membrane potential is patterned in the wing disc. Anterior cells near the boundary, where Hh signalling is most active, are more depolarized than posterior cells across the boundary. Elevated expression of the ENaC channel Ripped Pocket (Rpk), observed in these anterior cells, requires Hh. Antagonizing Rpk reduces depolarization and Hh signal transduction. Using genetic and optogenetic manipulations, in both the wing disc and the salivary gland, we show that membrane depolarization promotes membrane localization of Smoothened and augments Hh signalling, independently of Patched. Thus, membrane depolarization and Hh‐dependent signalling mutually reinforce each other in cells immediately anterior to the compartment boundary.
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Affiliation(s)
- Maya Emmons-Bell
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, USA
| | - Iswar K Hariharan
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, USA
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15
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Dong Q, Cheng LY. Getting in shape: ATP pumps up the volume in Hh signalling. EMBO J 2020; 39:e106564. [PMID: 33021741 DOI: 10.15252/embj.2020106564] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Glycolysis is a major metabolic process which ensures the break down of glucose into pyruvate via multiple enzymatic steps, but if and how this catabolism can impact on developmental patterning is unclear. In this issue, Spannl et al (2020) demonstrate a novel link between energy metabolism and tissue formation in the fly imaginal discs. They show that ATPs generated via glycolysis maintain active transport of a smoothened inhibitor, which keeps Hh signalling in check to preserve the correct shape and proportion of the developing wing.
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Affiliation(s)
- Qian Dong
- Peter MacCallum Cancer Institute, Melbourne, Vic., Australia
| | - Louise Y Cheng
- Peter MacCallum Cancer Institute, Melbourne, Vic., Australia
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