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Qi J, Shi L, Zhu L, Chen Y, Zhu H, Cheng W, Chen AF, Fu C. Functions, Mechanisms, and therapeutic applications of the inositol pyrophosphates 5PP-InsP 5 and InsP 8 in mammalian cells. J Cardiovasc Transl Res 2024; 17:197-215. [PMID: 37615888 DOI: 10.1007/s12265-023-10427-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 08/14/2023] [Indexed: 08/25/2023]
Abstract
Water-soluble myo-inositol phosphates have long been characterized as second messengers. The signaling properties of these compounds are determined by the number and arrangement of phosphate groups on the myo-inositol backbone. Recently, higher inositol phosphates with pyrophosphate groups were recognized as signaling molecules. 5-Diphosphoinositol 1,2,3,4,6-pentakisphosphate (5PP-InsP5) is the most abundant isoform, constituting more than 90% of intracellular inositol pyrophosphates. 5PP-InsP5 can be further phosphorylated to 1,5-bisdiphosphoinositol 2,3,4,6-tetrakisphosphate (InsP8). These two molecules, 5PP-InsP5 and InsP8, are present in various subcellular compartments, where they participate in regulating diverse cellular processes such as cell death, energy homeostasis, and cytoskeletal dynamics. The synthesis and metabolism of inositol pyrophosphates are subjected to tight regulation, allowing for their highly specific functions. Blocking the 5PP-InsP5/InsP8 signaling pathway by inhibiting the biosynthesis of 5PP-InsP5 demonstrates therapeutic benefits in preclinical studies, and thus holds promise as a therapeutic approach for certain diseases treatment, such as metabolic disorders.
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Affiliation(s)
- Ji Qi
- Institute for Developmental and Regenerative Cardiovascular Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China
| | - Linhui Shi
- Department of Critical Care Unit, Ningbo Medical Center Li Huili Hospital, Ningbo University, Ningbo, 315040, Zhejiang, China
| | - Limei Zhu
- Department of Trauma Orthopedics, Ningbo No.6 Hospital, Ningbo, 315040, China
| | - Yuanyuan Chen
- Institute for Developmental and Regenerative Cardiovascular Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China
| | - Hong Zhu
- Department of Obstetrics and Gynecology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China
| | - Weiwei Cheng
- Department of Nuclear Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China
| | - Alex F Chen
- Institute for Developmental and Regenerative Cardiovascular Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China.
| | - Chenglai Fu
- Institute for Developmental and Regenerative Cardiovascular Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China.
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Contreras A, Jones MK, Eldon ED, Klig LS. Inositol in Disease and Development: Roles of Catabolism via myo-Inositol Oxygenase in Drosophila melanogaster. Int J Mol Sci 2023; 24:4185. [PMID: 36835596 PMCID: PMC9967586 DOI: 10.3390/ijms24044185] [Citation(s) in RCA: 1] [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: 09/01/2022] [Revised: 02/14/2023] [Accepted: 02/15/2023] [Indexed: 02/22/2023] Open
Abstract
Inositol depletion has been associated with diabetes and related complications. Increased inositol catabolism, via myo-inositol oxygenase (MIOX), has been implicated in decreased renal function. This study demonstrates that the fruit fly Drosophila melanogaster catabolizes myo-inositol via MIOX. The levels of mRNA encoding MIOX and MIOX specific activity are increased when fruit flies are grown on a diet with inositol as the sole sugar. Inositol as the sole dietary sugar can support D. melanogaster survival, indicating that there is sufficient catabolism for basic energy requirements, allowing for adaptation to various environments. The elimination of MIOX activity, via a piggyBac WH-element inserted into the MIOX gene, results in developmental defects including pupal lethality and pharate flies without proboscises. In contrast, RNAi strains with reduced levels of mRNA encoding MIOX and reduced MIOX specific activity develop to become phenotypically wild-type-appearing adult flies. myo-Inositol levels in larval tissues are highest in the strain with this most extreme loss of myo-inositol catabolism. Larval tissues from the RNAi strains have inositol levels higher than wild-type larval tissues but lower levels than the piggyBac WH-element insertion strain. myo-Inositol supplementation of the diet further increases the myo-inositol levels in the larval tissues of all the strains, without any noticeable effects on development. Obesity and blood (hemolymph) glucose, two hallmarks of diabetes, were reduced in the RNAi strains and further reduced in the piggyBac WH-element insertion strain. Collectively, these data suggest that moderately increased myo-inositol levels do not cause developmental defects and directly correspond to reduced larval obesity and blood (hemolymph) glucose.
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Affiliation(s)
- Altagracia Contreras
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Melissa K. Jones
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
- Genentech, South San Francisco, CA 94080, USA
| | - Elizabeth D. Eldon
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
| | - Lisa S. Klig
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
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Rivera MJ, Contreras A, Nguyen LT, Eldon ED, Klig LS. Regulated inositol synthesis is critical for balanced metabolism and development in Drosophila melanogaster. Biol Open 2021; 10:272639. [PMID: 34710213 PMCID: PMC8565467 DOI: 10.1242/bio.058833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 08/31/2021] [Indexed: 01/23/2023] Open
Abstract
Myo-inositol is a precursor of the membrane phospholipid, phosphatidylinositol (PI). It is involved in many essential cellular processes including signal transduction, energy metabolism, endoplasmic reticulum stress, and osmoregulation. Inositol is synthesized from glucose-6-phosphate by myo-inositol-3-phosphate synthase (MIPSp). The Drosophila melanogaster Inos gene encodes MIPSp. Abnormalities in myo-inositol metabolism have been implicated in type 2 diabetes, cancer, and neurodegenerative disorders. Obesity and high blood (hemolymph) glucose are two hallmarks of diabetes, which can be induced in Drosophila melanogaster third-instar larvae by high-sucrose diets. This study shows that dietary inositol reduces the obese-like and high-hemolymph glucose phenotypes of third-instar larvae fed high-sucrose diets. Furthermore, this study demonstrates Inos mRNA regulation by dietary inositol; when more inositol is provided there is less Inos mRNA. Third-instar larvae with dysregulated high levels of Inos mRNA and MIPSp show dramatic reductions of the obese-like and high-hemolymph glucose phenotypes. These strains, however, also display developmental defects and pupal lethality. The few individuals that eclose die within two days with striking defects: structural alterations of the wings and legs, and heads lacking proboscises. This study is an exciting extension of the use of Drosophila melanogaster as a model organism for exploring the junction of development and metabolism. Summary: Inositol reduces obesity and high blood (hemolymph) glucose, but can cause dramatic developmental defects. This study uses the model organism Drosophila melanogaster to explore the junction of development and metabolism.
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Affiliation(s)
- Maria J Rivera
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
| | - Altagracia Contreras
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
| | - LongThy T Nguyen
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
| | - Elizabeth D Eldon
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
| | - Lisa S Klig
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
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Yang ZL, Chen JN, Lu YY, Lu M, Wan QL, Wu GS, Luo HR. Inositol polyphosphate multikinase IPMK-1 regulates development through IP3/calcium signaling in Caenorhabditis elegans. Cell Calcium 2020; 93:102327. [PMID: 33316585 DOI: 10.1016/j.ceca.2020.102327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 11/25/2020] [Accepted: 11/27/2020] [Indexed: 01/17/2023]
Abstract
Inositol polyphosphate multikinase (IPMK) is a conserved protein that initiates the production of inositol phosphate intracellular messengers and is critical for regulating a variety of cellular processes. Here, we report that the C. elegans IPMK-1, which is homologous to the mammalian inositol polyphosphate multikinase, plays a crucial role in regulating rhythmic behavior and development. The deletion mutant ipmk-1(tm2687) displays a long defecation cycle period and retarded postembryonic growth. The expression of functional ipmk-1::GFP was detected in the pharyngeal muscles, amphid sheath cells, the intestine, excretory (canal) cells, proximal gonad, and spermatheca. The expression of IPMK-1 in the intestine was sufficient for the wild-type phenotype. The IP3-kinase activity of IPMK-1 is required for defecation rhythms and postembryonic development. The defective phenotypes of ipmk-1(tm2687) could be rescued by a loss-of-function mutation in type I inositol 5-phosphatase homolog (IPP-5) and improved by a supplemental Ca2+ in the medium. Our work demonstrates that IPMK-1 and the signaling molecule inositol triphosphate (IP3) pathway modulate rhythmic behaviors and development by dynamically regulating the concentration of intracellular Ca2+ in C. elegans. Advances in understanding the molecular regulation of Ca2+ homeostasis and regulation of organism development may lead to therapeutic strategies that modulate Ca2+ signaling to enhance function and counteract disease processes. Unraveling the physiological role of IPMK and the underlying functional mechanism in C. elegans would contribute to understanding the role of IPMK in other species, especially in mammals, and benefit further research on the involvement of IPMK in disease.
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Affiliation(s)
- Zhong-Lin Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Science, Kunming, Yunnan 650201, China; Graduate University of the Chinese Academy of Science, Beijing, 100049, China
| | - Jian-Ning Chen
- Key Laboratory for Aging and Regenerative Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Yu-Yang Lu
- Key Laboratory for Aging and Regenerative Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Min Lu
- Key Laboratory for Aging and Regenerative Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Qin-Li Wan
- The Center for Precision Medicine of First Affiliated Hospital, Biomedical Translational Research Institute, Jinan University, Guangzhou, Guangdong 510632, China
| | - Gui-Sheng Wu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Science, Kunming, Yunnan 650201, China; Key Laboratory for Aging and Regenerative Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China.
| | - Huai-Rong Luo
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Science, Kunming, Yunnan 650201, China; Graduate University of the Chinese Academy of Science, Beijing, 100049, China; Key Laboratory for Aging and Regenerative Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China.
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5
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Cestari I, Stuart K. The phosphoinositide regulatory network in Trypanosoma brucei: Implications for cell-wide regulation in eukaryotes. PLoS Negl Trop Dis 2020; 14:e0008689. [PMID: 33119588 PMCID: PMC7595295 DOI: 10.1371/journal.pntd.0008689] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The unicellular eukaryote Trypanosoma brucei undergoes extensive cellular and developmental changes during its life cycle. These include regulation of mammalian stage surface antigen variation and surface composition changes between life stages; switching between glycolysis and oxidative phosphorylation; differential mRNA editing; and changes in posttranscriptional gene expression, protein trafficking, organellar function, and cell morphology. These diverse events are coordinated and controlled throughout parasite development, maintained in homeostasis at each life stage, and are essential for parasite survival in both the host and insect vector. Described herein are the enzymes and metabolites of the phosphatidylinositol (PI) cellular regulatory network, its integration with other cellular regulatory systems that collectively control and coordinate these numerous cellular processes, including cell development and differentiation and the many associated complex processes in multiple subcellular compartments. We conclude that this regulation is the product of the organization of these enzymes within the cellular architecture, their activities, metabolite fluxes, and responses to environmental changes via signal transduction and other processes. We describe a paradigm for how these enzymes and metabolites could function to control and coordinate multiple cellular functions. The significance of the PI system's regulatory functions in single-celled eukaryotes to metazoans and their potential as chemotherapeutic targets are indicated.
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Affiliation(s)
- Igor Cestari
- Institute of Parasitology, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
- * E-mail: (IC); (KS)
| | - Kenneth Stuart
- Center for Global Infectious Disease Research, Seattle Children’s Research Institute, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
- * E-mail: (IC); (KS)
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Guha P, Tyagi R, Chowdhury S, Reilly L, Fu C, Xu R, Resnick AC, Snyder SH. IPMK Mediates Activation of ULK Signaling and Transcriptional Regulation of Autophagy Linked to Liver Inflammation and Regeneration. Cell Rep 2020; 26:2692-2703.e7. [PMID: 30840891 PMCID: PMC6494083 DOI: 10.1016/j.celrep.2019.02.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 12/04/2018] [Accepted: 02/01/2019] [Indexed: 12/14/2022] Open
Abstract
Autophagy plays a broad role in health and disease. Here, we show that
inositol polyphosphate multikinase (IPMK) is a prominent physiological
determinant of autophagy and is critical for liver inflammation and
regeneration. Deletion of IPMK diminishes autophagy in cell lines and mouse
liver. Regulation of autophagy by IPMK does not require catalytic activity. Two
signaling axes, IPMK-AMPK-Sirt-1 and IPMK-AMPK-ULK1, appear to mediate the
influence of IPMK on autophagy. IPMK enhances autophagy-related transcription by
stimulating AMPK-depen-dent Sirt-1 activation, which mediates the deacetylation
of histone 4 lysine 16. Furthermore, direct binding of IPMK to ULK and AMPK
forms a ternary complex that facilitates AMPK-dependent ULK phosphorylation.
Deletion of IPMK in cell lines and intact mice virtually abolishes lipophagy,
promotes liver damage as well as inflammation, and impairs hepatocyte
regeneration. Thus, targeting IPMK may afford therapeutic benefits in
disabilities that depend on autophagy and lipophagy—specifically, in
liver inflammation and regeneration. IPMK is a physiological determinant of autophagy and is critical in liver
inflammation. Two signaling axes, IPMK-AMPK-Sirt-1 and IPMK-AMPK-ULK1, appear to
mediate the influence of IPMK on autophagy. Deletion of IPMK impairs lipophagy
and hepatocyte regeneration.
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Affiliation(s)
- Prasun Guha
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Richa Tyagi
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Sayan Chowdhury
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Luke Reilly
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Chenglai Fu
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Risheng Xu
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Adam C Resnick
- Children's Hospital of Philadelphia, Colket Translational Research Building, 3501 Civic Center Blvd., Philadelphia, PA 19104-4399, USA
| | - Solomon H Snyder
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
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Structural analyses of inositol phosphate second messengers bound to signaling effector proteins. Adv Biol Regul 2019; 75:100667. [PMID: 31648945 DOI: 10.1016/j.jbior.2019.100667] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 09/17/2019] [Accepted: 09/30/2019] [Indexed: 01/02/2023]
Abstract
The higher-order inositol phosphate second messengers inositol tetrakisphosphate (IP4), inositol pentakisphosphate (IP5) and inositol hexakisphosphate (IP6) are important signaling molecules that regulate DNA-damage repair, cohesin dynamics, RNA-editing, retroviral assembly, nuclear transport, phosphorylation, acetylation, crotonylation, and ubiquitination. This functional diversity has made understanding how inositol polyphosphates regulate cellular processes challenging to dissect. However, some inositol phosphates have been unexpectedly found in X-ray crystal structures, occasionally revealing structural and mechanistic details of effector protein regulation before functional consequences have been described. This review highlights a sampling of crystal structures describing the interaction between inositol phosphates and protein effectors. This list includes the RNA editing enzyme "adenosine deaminase that acts on RNA 2" (ADAR2), the Pds5B regulator of cohesin dynamics, the class 1 histone deacetylases (HDACs) HDAC1 and HDAC3, and the PH domain of Bruton's tyrosine kinase (Btk). One of the most important enzymes responsible for higher-order inositol phosphate synthesis is inositol polyphosphate multikinase (IPMK), which plays dual roles in both inositol and phosphoinositide signaling. Structures of phosphoinositide lipid binding proteins have also revealed new aspects of protein effector regulation, as mediated by the nuclear receptors Steroidogenic Factor-1 (SF-1, NR5A2) and Liver Receptor Homolog-1 (LRH-1, NR5A2). Together, these studies underscore the structural diversity in binding interactions between effector proteins and inositol phosphate small signaling molecules, and further support that detailed structural studies can lead to new biological discovery.
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Centrosome Loss Triggers a Transcriptional Program To Counter Apoptosis-Induced Oxidative Stress. Genetics 2019; 212:187-211. [PMID: 30867197 DOI: 10.1534/genetics.119.302051] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 03/08/2019] [Indexed: 12/13/2022] Open
Abstract
Centrosomes play a critical role in mitotic spindle assembly through their role in microtubule nucleation and bipolar spindle assembly. Loss of centrosomes can impair the ability of some cells to properly conduct mitotic division, leading to chromosomal instability, cell stress, and aneuploidy. Multiple aspects of the cellular response to mitotic error associated with centrosome loss appear to involve activation of JNK signaling. To further characterize the transcriptional effects of centrosome loss, we compared gene expression profiles of wild-type and acentrosomal cells from Drosophila wing imaginal discs. We found elevation of expression of JNK target genes, which we verified at the protein level. Consistent with this, the upregulated gene set showed significant enrichment for the AP-1 consensus DNA-binding sequence. We also found significant elevation in expression of genes regulating redox balance. Based on those findings, we examined oxidative stress after centrosome loss, revealing that acentrosomal wing cells have significant increases in reactive oxygen species (ROS). We then performed a candidate genetic screen and found that one of the genes upregulated in acentrosomal cells, glucose-6-phosphate dehydrogenase, plays an important role in buffering acentrosomal cells against increased ROS and helps protect those cells from cell death. Our data and other recent studies have revealed a complex network of signaling pathways, transcriptional programs, and cellular processes that epithelial cells use to respond to stressors, like mitotic errors, to help limit cell damage and maintain normal tissue development.
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Cestari I, Anupama A, Stuart K. Inositol polyphosphate multikinase regulation of Trypanosoma brucei life stage development. Mol Biol Cell 2018. [PMID: 29514930 PMCID: PMC5921579 DOI: 10.1091/mbc.e17-08-0515] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The regulation of Trypanosoma brucei life stage development remains unclear. Inositol polyphosphate multikinase regulates the development of mammalian bloodforms to insect stages that normally develop in flies. Specific inositol phosphates, perhaps as second messengers, interact with proteins of the regulatory network that controls development. Many cellular processes change during the Trypanosoma brucei life cycle as this parasite alternates between the mammalian host and tsetse fly vector. We show that the inositol phosphate pathway helps regulate these developmental changes. Knockdown of inositol polyphosphate multikinase (IPMK), which phosphorylates Ins(1,4,5)P3 and Ins(1,3,4,5)P4, resulted in changes in bloodstream forms that are characteristic of insect stage procyclic forms. These changes include expression of the procyclic surface coat, up-regulation of RNA-binding proteins that we show to regulate stage-specific transcripts, and activation of oxidative phosphorylation with increased ATP production in bloodstream forms. These changes were accompanied by development of procyclic morphology, which also occurred by the expression of a catalytically inactive IPMK, implying that regulation of these processes entails IPMK activity. Proteins involved in signaling, protein synthesis and turnover, and metabolism were affinity-enriched with the IPMK substrate or product. Developmental changes associated with IPMK knockdown or catalytic inactivation reflected processes that are enriched with inositol phosphates, and chemical and genetic perturbation of these processes affected T. brucei development. Hence, IPMK helps regulate T. brucei development, perhaps by affecting inositol phosphate interactions with proteins of the regulatory network that controls energy metabolism and development.
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Affiliation(s)
- Igor Cestari
- Center for Infectious Disease Research, Seattle, WA 98109
| | - Atashi Anupama
- Center for Infectious Disease Research, Seattle, WA 98109
| | - Kenneth Stuart
- Center for Infectious Disease Research, Seattle, WA 98109.,Department of Global Health, University of Washington, Seattle, WA 98195
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Fu C, Tyagi R, Chin AC, Rojas T, Li RJ, Guha P, Bernstein IA, Rao F, Xu R, Cha JY, Xu J, Snowman AM, Semenza GL, Snyder SH. Inositol Polyphosphate Multikinase Inhibits Angiogenesis via Inositol Pentakisphosphate-Induced HIF-1α Degradation. Circ Res 2017; 122:457-472. [PMID: 29279301 DOI: 10.1161/circresaha.117.311983] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 12/18/2017] [Accepted: 12/22/2017] [Indexed: 12/17/2022]
Abstract
RATIONALE Inositol polyphosphate multikinase (IPMK) and its major product inositol pentakisphosphate (IP5) regulate a variety of cellular functions, but their role in vascular biology remains unexplored. OBJECTIVE We have investigated the role of IPMK in regulating angiogenesis. METHODS AND RESULTS Deletion of IPMK in fibroblasts induces angiogenesis in both in vitro and in vivo models. IPMK deletion elicits a substantial increase of VEGF (vascular endothelial growth factor), which mediates the regulation of angiogenesis by IPMK. The regulation of VEGF by IPMK requires its catalytic activity. IPMK is predominantly nuclear and regulates gene transcription. However, IPMK does not apparently serve as a transcription factor for VEGF. HIF (hypoxia-inducible factor)-1α is a major determinant of angiogenesis and induces VEGF transcription. IPMK deletion elicits a major enrichment of HIF-1α protein and thus VEGF. HIF-1α is constitutively ubiquitinated by pVHL (von Hippel-Lindau protein) followed by proteasomal degradation under normal conditions. However, HIF-1α is not recognized and ubiquitinated by pVHL in IPMK KO (knockout) cells. IP5 reinstates the interaction of HIF-1α and pVHL. HIF-1α prolyl hydroxylation, which is prerequisite for pVHL recognition, is interrupted in IPMK-deleted cells. IP5 promotes HIF-1α prolyl hydroxylation and thus pVHL-dependent degradation of HIF-1α. Deletion of IPMK in mouse brain increases HIF-1α/VEGF levels and vascularization. The increased VEGF in IPMK KO disrupts blood-brain barrier and enhances brain blood vessel permeability. CONCLUSIONS IPMK, via its product IP5, negatively regulates angiogenesis by inhibiting VEGF expression. IP5 acts by enhancing HIF-1α hydroxylation and thus pVHL-dependent degradation of HIF-1α.
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Affiliation(s)
- Chenglai Fu
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Richa Tyagi
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Alfred C Chin
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Tomas Rojas
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Ruo-Jing Li
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Prasun Guha
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Isaac A Bernstein
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Feng Rao
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Risheng Xu
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jiyoung Y Cha
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jing Xu
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Adele M Snowman
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Gregg L Semenza
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD
| | - Solomon H Snyder
- From the Solomon H. Snyder Department of Neuroscience (C.F., R.T., A.C.C., T.R., P.G., I.A.B., F.R., R.X., J.Y.C., J.X., A.M.S., S.H.S.), Department of Pharmacology and Molecular Sciences (R.-J.L., S.H.S.), Institute for Cell Engineering (G.L.S.), McKusick-Nathans Institute of Genetic Medicine (G.L.S.), Department of Pediatrics (G.L.S.), Department of Medicine (G.L.S.), Department of Oncology (G.L.S.), Department of Radiation Oncology (G.L.S.), Department of Biological Chemistry (G.L.S.), and Department of Psychiatry and Behavioral Sciences (S.H.S.), Johns Hopkins University School of Medicine, Baltimore, MD.
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Novel Therapeutic Targets for Human African Trypanosomiasis. CURRENT TREATMENT OPTIONS IN INFECTIOUS DISEASES 2017. [DOI: 10.1007/s40506-017-0120-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Kim E, Beon J, Lee S, Park SJ, Ahn H, Kim MG, Park JE, Kim W, Yuk JM, Kang SJ, Lee SH, Jo EK, Seong RH, Kim S. Inositol polyphosphate multikinase promotes Toll-like receptor-induced inflammation by stabilizing TRAF6. SCIENCE ADVANCES 2017; 3:e1602296. [PMID: 28439546 PMCID: PMC5400429 DOI: 10.1126/sciadv.1602296] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 02/24/2017] [Indexed: 05/08/2023]
Abstract
Toll-like receptor (TLR) signaling is tightly controlled to protect hosts from microorganisms while simultaneously preventing uncontrolled immune responses. Tumor necrosis factor receptor-associated factor 6 (TRAF6) is a critical mediator of TLR signaling, but the precise mechanism of how TRAF6 protein stability is strictly controlled still remains obscure. We show that myeloid-specific deletion of inositol polyphosphate multikinase (IPMK), which has both inositol polyphosphate kinase activities and noncatalytic signaling functions, protects mice against polymicrobial sepsis and lipopolysaccharide-induced systemic inflammation. IPMK depletion in macrophages results in decreased levels of TRAF6 protein, thereby dampening TLR-induced signaling and proinflammatory cytokine production. Mechanistically, the regulatory role of IPMK is independent of its catalytic function, instead reflecting its direct binding to TRAF6. This interaction stabilizes TRAF6 by blocking its K48-linked ubiquitination and subsequent degradation by the proteasome. Thus, these findings identify IPMK as a key determinant of TRAF6 stability and elucidate the physiological function of IPMK in TLR-induced innate immunity.
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Affiliation(s)
- Eunha Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Jiyoon Beon
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Seulgi Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Seung Ju Park
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hyoungjoon Ahn
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Min Gyu Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Jeong Eun Park
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Wooseob Kim
- School of Biological Sciences and Institute for Molecular Biology and Genetics, Seoul National University, Seoul 08826, Korea
| | - Jae-Min Yuk
- Department of Infection Biology, Chungnam National University School of Medicine, Daejeon 35015, Korea
| | - Suk-Jo Kang
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Seung-Hyo Lee
- Graduate School of Medical Science and Engineering, KAIST, Daejeon 34141, Korea
| | - Eun-Kyeong Jo
- Department of Microbiology, Chungnam National University School of Medicine, Daejeon 35015, Korea
| | - Rho Hyun Seong
- School of Biological Sciences and Institute for Molecular Biology and Genetics, Seoul National University, Seoul 08826, Korea
- Corresponding author. (R.H.S.); (S.K.)
| | - Seyun Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- KAIST Institute for the BioCentury, KAIST, Daejeon 34141, Korea
- Corresponding author. (R.H.S.); (S.K.)
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13
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Chemogenetic Characterization of Inositol Phosphate Metabolic Pathway Reveals Druggable Enzymes for Targeting Kinetoplastid Parasites. Cell Chem Biol 2016; 23:608-617. [PMID: 27133314 DOI: 10.1016/j.chembiol.2016.03.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 03/16/2016] [Accepted: 03/20/2016] [Indexed: 01/08/2023]
Abstract
Kinetoplastids cause Chagas disease, human African trypanosomiasis, and leishmaniases. Current treatments for these diseases are toxic and inefficient, and our limited knowledge of drug targets and inhibitors has dramatically hindered the development of new drugs. Here we used a chemogenetic approach to identify new kinetoplastid drug targets and inhibitors. We conditionally knocked down Trypanosoma brucei inositol phosphate (IP) pathway genes and showed that almost every pathway step is essential for parasite growth and infection. Using a genetic and chemical screen, we identified inhibitors that target IP pathway enzymes and are selective against T. brucei. Two series of these inhibitors acted on T. brucei inositol polyphosphate multikinase (IPMK) preventing Ins(1,4,5)P3 and Ins(1,3,4,5)P4 phosphorylation. We show that IPMK is functionally conserved among kinetoplastids and that its inhibition is also lethal for Trypanosoma cruzi. Hence, IP enzymes are viable drug targets in kinetoplastids, and IPMK inhibitors may aid the development of new drugs.
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