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Lee JH, Jung IR, Tu-Sekine B, Jin S, Anokye-Danso F, Ahima RS, Kim SF. Genetic Deletion of Skeletal Muscle Inositol Polyphosphate Multikinase Disrupts Glucose Homeostasis and Impairs Exercise Tolerance. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.28.605526. [PMID: 39131310 PMCID: PMC11312436 DOI: 10.1101/2024.07.28.605526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 08/13/2024]
Abstract
Inositol phosphates are critical signaling messengers involved in a wide range of biological pathways in which inositol polyphosphate multikinase (IPMK) functions as a rate-limiting enzyme for inositol polyphosphate metabolism. IPMK has been implicated in cellular metabolism, but its function at the systemic level is still poorly understood. Since skeletal muscle is a major contributor to energy homeostasis, we have developed a mouse model in which skeletal muscle IPMK is specifically deleted and examined how a loss of IPMK affects whole-body metabolism. Here, we report that mice in which IPMK knockout is deleted, specifically in the skeletal muscle, displayed an increased body weight, disrupted glucose tolerance, and reduced exercise tolerance under the normal diet. Moreover, these changes were associated with an increased accumulation of triglyceride in skeletal muscle. Furthermore, we have confirmed that a loss of IPMK led to reduced beta-oxidation, increased triglyceride accumulation, and impaired insulin response in IPMK-deficient muscle cells. Thus, our results suggest that IPMK mediates the whole-body metabolism via regulating muscle metabolism and may be potentially targeted for the treatment of metabolic syndromes.
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Affiliation(s)
- Ji-Hyun Lee
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
| | - Ik-Rak Jung
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
| | - Becky Tu-Sekine
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
| | - Sunghee Jin
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
| | - Frederick Anokye-Danso
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
| | - Rexford S Ahima
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
| | - Sangwon F Kim
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University, Baltimore, Maryland, USA. 21224
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Reilly L, Semenza ER, Koshkaryan G, Mishra S, Chatterjee S, Abramson E, Mishra P, Sei Y, Wank SA, Donowitz M, Snyder SH, Guha P. Loss of PI3k activity of inositol polyphosphate multikinase impairs PDK1-mediated AKT activation, cell migration, and intestinal homeostasis. iScience 2023; 26:106623. [PMID: 37216099 PMCID: PMC10197106 DOI: 10.1016/j.isci.2023.106623] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 02/22/2023] [Accepted: 04/03/2023] [Indexed: 05/24/2023] Open
Abstract
Protein kinase B (AKT) is essential for cell survival, proliferation, and migration and has been associated with several diseases. Here, we demonstrate that inositol polyphosphate multikinase (IPMK's) lipid kinase property drives AKT activation via increasing membrane localization and activation of PDK1 (3-Phosphoinositide-dependent kinase 1), largely independent of class I PI3k (cPI3K). Deletion of IPMK impairs cell migration, which is partially associated with the abolition of PDK1-mediated ROCK1 disinhibition and subsequent myosin light chain (MLC) phosphorylation. IPMK is highly expressed in intestinal epithelial cells (IEC). Deleting IPMK in IEC reduced AKT phosphorylation and diminished the number of Paneth cells. Ablation of IPMK impaired IEC regeneration both basally and after chemotherapy-induced damage, suggesting a broad role for IPMK in activating AKT and intestinal tissue regeneration. In conclusion, the PI3k activity of IPMK is necessary for PDK1-mediated AKT activation and intestinal homeostasis.
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Affiliation(s)
- Luke Reilly
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Evan R. Semenza
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - George Koshkaryan
- Nevada Institute of Personalized Medicine (NIPM), University of Nevada, Las Vegas, NV 89154, USA
| | - Subrata Mishra
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Reference Standard Laboratory, United States Pharmacopeial Convention, Rockville, MD 20852, USA
| | - Sujan Chatterjee
- Nevada Institute of Personalized Medicine (NIPM), University of Nevada, Las Vegas, NV 89154, USA
| | - Efrat Abramson
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Pamela Mishra
- Marie-Josée and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York City, NY, USA
| | - Yoshitasu Sei
- Digestive Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Stephen A. Wank
- Digestive Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Mark Donowitz
- Department of Medicine, Division of Gastroenterology, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205, 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
| | - Prasun Guha
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Nevada Institute of Personalized Medicine (NIPM), University of Nevada, Las Vegas, NV 89154, USA
- School of Life Sciences, University of Nevada, Las Vegas, NV 89154, USA
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Mukherjee A, Ron JE, Hu HT, Nishimura T, Hanawa‐Suetsugu K, Behkam B, Mimori‐Kiyosue Y, Gov NS, Suetsugu S, Nain AS. Actin Filaments Couple the Protrusive Tips to the Nucleus through the I-BAR Domain Protein IRSp53 during the Migration of Cells on 1D Fibers. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2207368. [PMID: 36698307 PMCID: PMC9982589 DOI: 10.1002/advs.202207368] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Indexed: 05/31/2023]
Abstract
The cell migration cycle, well-established in 2D, proceeds with forming new protrusive structures at the cell membrane and subsequent redistribution of contractile machinery. Three-dimensional (3D) environments are complex and composed of 1D fibers, and 1D fibers are shown to recapitulate essential features of 3D migration. However, the establishment of protrusive activity at the cell membrane and contractility in 1D fibrous environments remains partially understood. Here the role of membrane curvature regulator IRSp53 is examined as a coupler between actin filaments and plasma membrane during cell migration on single, suspended 1D fibers. IRSp53 depletion reduced cell-length spanning actin stress fibers that originate from the cell periphery, protrusive activity, and contractility, leading to uncoupling of the nucleus from cellular movements. A theoretical model capable of predicting the observed transition of IRSp53-depleted cells from rapid stick-slip migration to smooth and slower migration due to reduced actin polymerization at the cell edges is developed, which is verified by direct measurements of retrograde actin flow using speckle microscopy. Overall, it is found that IRSp53 mediates actin recruitment at the cellular tips leading to the establishment of cell-length spanning fibers, thus demonstrating a unique role of IRSp53 in controlling cell migration in 3D.
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Affiliation(s)
- Apratim Mukherjee
- Department of Mechanical EngineeringVirginia TechBlacksburgVA24061USA
| | - Jonathan Emanuel Ron
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot7610001Israel
| | - Hooi Ting Hu
- Division of Biological ScienceGraduate School of Science and TechnologyNara Institute of Science and TechnologyIkoma630‐0192Japan
| | - Tamako Nishimura
- Division of Biological ScienceGraduate School of Science and TechnologyNara Institute of Science and TechnologyIkoma630‐0192Japan
| | | | - Bahareh Behkam
- Department of Mechanical EngineeringVirginia TechBlacksburgVA24061USA
| | - Yuko Mimori‐Kiyosue
- Laboratory for Molecular and Cellular DynamicsRIKEN Center for Biosystems Dynamics ResearchMinatojima‐minaminachiChuo‐kuKobeHyogo650‐0047Japan
| | - Nir Shachna Gov
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot7610001Israel
| | - Shiro Suetsugu
- Division of Biological ScienceGraduate School of Science and TechnologyNara Institute of Science and TechnologyIkoma630‐0192Japan
- Data Science CenterNara Institute of Science and TechnologyIkoma630‐0192Japan
- Center for Digital Green‐innovationNara Institute of Science and TechnologyIkoma630‐0192Japan
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Clark JM, Garvey WT, Niswender KD, Schmidt AM, Ahima RS, Aleman JO, Battarbee AN, Beckman J, Bennett WL, Brown NJ, Chandler‐Laney P, Cox N, Goldberg IJ, Habegger KM, Harper LM, Hasty AH, Hidalgo BA, Kim SF, Locher JL, Luther JM, Maruthur NM, Miller ER, Sevick MA, Wells Q. Obesity and Overweight: Probing Causes, Consequences, and Novel Therapeutic Approaches Through the American Heart Association's Strategically Focused Research Network. J Am Heart Assoc 2023; 12:e027693. [PMID: 36752232 PMCID: PMC10111504 DOI: 10.1161/jaha.122.027693] [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: 08/08/2022] [Accepted: 01/03/2023] [Indexed: 02/09/2023]
Abstract
As the worldwide prevalence of overweight and obesity continues to rise, so too does the urgency to fully understand mediating mechanisms, to discover new targets for safe and effective therapeutic intervention, and to identify biomarkers to track obesity and the success of weight loss interventions. In 2016, the American Heart Association sought applications for a Strategically Focused Research Network (SFRN) on Obesity. In 2017, 4 centers were named, including Johns Hopkins University School of Medicine, New York University Grossman School of Medicine, University of Alabama at Birmingham, and Vanderbilt University Medical Center. These 4 centers were convened to study mechanisms and therapeutic targets in obesity, to train a talented cadre of American Heart Association SFRN-designated fellows, and to initiate and sustain effective and enduring collaborations within the individual centers and throughout the SFRN networks. This review summarizes the central themes, major findings, successful training of highly motivated and productive fellows, and the innovative collaborations and studies forged through this SFRN on Obesity. Leveraging expertise in in vitro and cellular model assays, animal models, and humans, the work of these 4 centers has made a significant impact in the field of obesity, opening doors to important discoveries, and the identification of a future generation of obesity-focused investigators and next-step clinical trials. The creation of the SFRN on Obesity for these 4 centers is but the beginning of innovative science and, importantly, the birth of new collaborations and research partnerships to propel the field forward.
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Affiliation(s)
- Jeanne M. Clark
- Division of General Internal Medicine, Department of MedicineThe Johns Hopkins University School of MedicineBaltimoreMD
- Department of EpidemiologyThe Johns Hopkins Bloomberg School of Public HealthBaltimoreMD
- Welch Center for Prevention, Epidemiology and Clinical ResearchThe Johns Hopkins UniversityBaltimoreMD
| | - W. Timothy Garvey
- Department of Nutrition SciencesUniversity of Alabama at BirminghamBirminghamAL
| | - Kevin D. Niswender
- Tennessee Valley Healthcare SystemVanderbilt University Medical CenterNashvilleTN
- Division of Diabetes, Department of Medicine, Endocrinology and MetabolismVanderbilt University Medical CenterNashvilleTN
| | - Ann Marie Schmidt
- Department of Medicine, Diabetes Research Program, Division of Endocrinology, Diabetes and MetabolismNew York University Grossman School of MedicineNew YorkNY
| | - Rexford S. Ahima
- Department of Medicine, Division of Endocrinology, Diabetes and MetabolismThe Johns Hopkins University School of MedicineBaltimoreMD
| | - Jose O. Aleman
- Division of Endocrinology, Department of Medicine, Diabetes and MetabolismNew York University Grossman School of MedicineNew YorkNY
| | - Ashley N. Battarbee
- Division of Maternal Fetal Medicine, Department of Obstetrics and GynecologyUniversity of Alabama at BirminghamBirminghamAL
| | - Joshua Beckman
- Division of Cardiovascular Medicine, Department of MedicineVanderbilt University Medical CenterNashvilleTN
| | - Wendy L. Bennett
- Division of General Internal Medicine, Department of MedicineThe Johns Hopkins University School of MedicineBaltimoreMD
- Department of EpidemiologyThe Johns Hopkins Bloomberg School of Public HealthBaltimoreMD
- Welch Center for Prevention, Epidemiology and Clinical ResearchThe Johns Hopkins UniversityBaltimoreMD
- Department of Population, Family and Reproductive HealthThe Johns Hopkins Bloomberg School of Public HealthBaltimoreMD
| | | | | | - Nancy Cox
- Vanderbilt Genetics Institute and Division of Genetic Medicine, Department of MedicineVanderbilt University Medical CenterNashvilleTNUSA
| | - Ira J. Goldberg
- Division of Endocrinology, Department of Medicine, Diabetes and MetabolismNew York University Grossman School of MedicineNew YorkNY
| | - Kirk M. Habegger
- Division of Endocrinology, Department of Medicine, Diabetes, and MetabolismUniversity of Alabama at BirminghamBirminghamAL
| | - Lorie M. Harper
- Division of Maternal Fetal Medicine, Department of Obstetrics and GynecologyUniversity of Alabama at BirminghamBirminghamAL
- Division of Maternal‐Fetal Medicine, Department of Women’s Health, Dell Medical SchoolUniversity of Texas at AustinAustinTXUSA
| | - Alyssa H. Hasty
- Department of Molecular Physiology and BiophysicsVanderbilt University School of MedicineNashvilleTN
- VA Tennessee Valley Healthcare SystemNashvilleTN
| | - Bertha A. Hidalgo
- Department of EpidemiologyUniversity of Alabama at BirminghamBirminghamAL
| | - Sangwon F. Kim
- Department of Medicine, Division of Endocrinology, Diabetes and MetabolismThe Johns Hopkins University School of MedicineBaltimoreMD
- Department of NeuroscienceThe Johns Hopkins University School of MedicineBaltimoreMD
| | - Julie L. Locher
- Division of Gerontology, Department of Medicine, Geriatrics, and Palliative CareUniversity of Alabama at BirminghamBirminghamAL
| | - James M. Luther
- Division of Clinical Pharmacology, Department of MedicineVanderbilt University Medical Center TennesseeNashvilleTN
| | - Nisa M. Maruthur
- Division of General Internal Medicine, Department of MedicineThe Johns Hopkins University School of MedicineBaltimoreMD
- Department of EpidemiologyThe Johns Hopkins Bloomberg School of Public HealthBaltimoreMD
- Welch Center for Prevention, Epidemiology and Clinical ResearchThe Johns Hopkins UniversityBaltimoreMD
| | - Edgar R. Miller
- Division of General Internal Medicine, Department of MedicineThe Johns Hopkins University School of MedicineBaltimoreMD
- Department of EpidemiologyThe Johns Hopkins Bloomberg School of Public HealthBaltimoreMD
- Welch Center for Prevention, Epidemiology and Clinical ResearchThe Johns Hopkins UniversityBaltimoreMD
| | - Mary Ann Sevick
- Division of Endocrinology, Department of Medicine, Diabetes and MetabolismNew York University Grossman School of MedicineNew YorkNY
- Department of Population Health, Center for Healthful Behavior ChangeNew York University Langone HealthNew YorkNY
| | - Quinn Wells
- Department of PharmacologyVanderbilt UniversityNashvilleTN
- Department of MedicineVanderbilt University Medical CenterNashvilleTN
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5
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Jana A, Tran A, Gill A, Kiepas A, Kapania RK, Konstantopoulos K, Nain AS. Sculpting Rupture-Free Nuclear Shapes in Fibrous Environments. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203011. [PMID: 35863910 PMCID: PMC9443471 DOI: 10.1002/advs.202203011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Indexed: 05/07/2023]
Abstract
Cytoskeleton-mediated force transmission regulates nucleus morphology. How nuclei shaping occurs in fibrous in vivo environments remains poorly understood. Here suspended nanofiber networks of precisely tunable (nm-µm) diameters are used to quantify nucleus plasticity in fibrous environments mimicking the natural extracellular matrix. Contrary to the apical cap over the nucleus in cells on 2-dimensional surfaces, the cytoskeleton of cells on fibers displays a uniform actin network caging the nucleus. The role of contractility-driven caging in sculpting nuclear shapes is investigated as cells spread on aligned single fibers, doublets, and multiple fibers of varying diameters. Cell contractility increases with fiber diameter due to increased focal adhesion clustering and density of actin stress fibers, which correlates with increased mechanosensitive transcription factor Yes-associated protein (YAP) translocation to the nucleus. Unexpectedly, large- and small-diameter fiber combinations lead to teardrop-shaped nuclei due to stress fiber anisotropy across the cell. As cells spread on fibers, diameter-dependent nuclear envelope invaginations that run the nucleus's length are formed at fiber contact sites. The sharpest invaginations enriched with heterochromatin clustering and sites of DNA repair are insufficient to trigger nucleus rupture. Overall, the authors quantitate the previously unknown sculpting and adaptability of nuclei to fibrous environments with pathophysiological implications.
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Affiliation(s)
- Aniket Jana
- Department of Mechanical EngineeringVirginia TechBlacksburgVA24061USA
| | - Avery Tran
- Department of Chemical and Biomolecular EngineeringJohns Hopkins UniversityBaltimoreMD21218USA
| | - Amritpal Gill
- Department of Mechanical EngineeringVirginia TechBlacksburgVA24061USA
| | - Alexander Kiepas
- Department of Chemical and Biomolecular EngineeringJohns Hopkins UniversityBaltimoreMD21218USA
| | - Rakesh K. Kapania
- Kevin T. Crofton Department of Aerospace EngineeringVirginia TechBlacksburgVA24061USA
| | | | - Amrinder S. Nain
- Department of Mechanical EngineeringVirginia TechBlacksburgVA24061USA
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6
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Mukherjee A, Zhang H, Ladner K, Brown M, Urbanski J, Grieco JP, Kapania RK, Lou E, Behkam B, Schmelz EM, Nain AS. Quantitative Biophysical Metrics for Rapid Evaluation of Ovarian Cancer Metastatic Potential. Mol Biol Cell 2022; 33:ar55. [PMID: 34985924 PMCID: PMC9265161 DOI: 10.1091/mbc.e21-08-0419] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Ovarian cancer is routinely diagnosed long after the disease has metastasized through the fibrous sub-mesothelium. Despite extensive research in the field linking ovarian cancer progression to increasingly poor prognosis, there are currently no validated cellular markers or hallmarks of ovarian cancer that can predict metastatic potential. To discern disease progression across a syngeneic mouse ovarian cancer progression model, here, we fabricated extracellular-matrix mimicking suspended fiber networks: crosshatches of mismatch diameters for studying protrusion dynamics, aligned same diameter networks of varying inter-fiber spacing for studying migration, and aligned nanonets for measuring cell forces. We found that migration correlated with disease, while force-disease biphasic relationship exhibited f-actin stress-fiber network dependence. However, unique to suspended fibers, coiling occurring at tips of protrusions and not the length or breadth of protrusions displayed strongest correlation with metastatic potential. To confirm that our findings were more broadly applicable beyond the mouse model, we repeated our studies in human ovarian cancer cell lines and found that the biophysical trends were consistent with our mouse model results. Altogether, we report complementary high throughput and high content biophysical metrics capable of identifying ovarian cancer metastatic potential on time scale of hours. [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text].
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Affiliation(s)
| | - Haonan Zhang
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA
| | - Katherine Ladner
- Division of Hematology, Oncology and Transplantation, Masonic Cancer Center, University of Minnesota, Minneapolis, MN
| | - Megan Brown
- Department of Human Nutrition, Foods and Exercise, Virginia Tech, Blacksburg, VA
| | - Jacob Urbanski
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA
| | - Joseph P Grieco
- Department of Human Nutrition, Foods and Exercise, Virginia Tech, Blacksburg, VA
| | - Rakesh K Kapania
- Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA
| | - Emil Lou
- Division of Hematology, Oncology and Transplantation, Masonic Cancer Center, University of Minnesota, Minneapolis, MN
| | - Bahareh Behkam
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA
| | - Eva M Schmelz
- Department of Human Nutrition, Foods and Exercise, Virginia Tech, Blacksburg, VA
| | - Amrinder S Nain
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA
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Lee B, Park SJ, Hong S, Kim K, Kim S. Inositol Polyphosphate Multikinase Signaling: Multifaceted Functions in Health and Disease. Mol Cells 2021; 44:187-194. [PMID: 33935040 PMCID: PMC8112168 DOI: 10.14348/molcells.2021.0045] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/14/2021] [Accepted: 04/15/2021] [Indexed: 12/19/2022] Open
Abstract
Inositol phosphates are water-soluble intracellular signaling molecules found in eukaryotes from yeasts to mammals, which are synthesized by a complex network of enzymes including inositol phosphate kinases. Among these, inositol polyphosphate multikinase (IPMK) is a promiscuous enzyme with broad substrate specificity, which phosphorylates multiple inositol phosphates, as well as phosphatidylinositol 4,5-bisphosphate. In addition to its catalytic actions, IPMK is known to non-catalytically control major signaling events via direct protein-protein interactions. In this review, we describe the general characteristics of IPMK, highlight its pleiotropic roles in various physiological and pathological conditions, and discuss future challenges in the field of IPMK signaling pathways.
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Affiliation(s)
- Boah 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
| | - Sehoon Hong
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Kyunghan Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - 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
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8
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Padhi A, Danielsson BE, Alabduljabbar DS, Wang J, Conway DE, Kapania RK, Nain AS. Cell Fragment Formation, Migration, and Force Exertion on Extracellular Mimicking Fiber Nanonets. Adv Biol (Weinh) 2021; 5:e2000592. [PMID: 33759402 DOI: 10.1002/adbi.202000592] [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] [Received: 11/30/2020] [Revised: 03/01/2021] [Indexed: 12/16/2022]
Abstract
Cell fragments devoid of the nucleus play an essential role in intercellular communication. Mostly studied on flat 2D substrates, their origins and behavior in native fibrous environments remain unknown. Here, cytoplasmic fragments' spontaneous formation and behavior in suspended extracellular matrices mimicking fiber architectures (parallel, crosshatch, and hexagonal) are described. After cleaving from the parent cell body, the fragments of diverse shapes on fibers migrate faster compared to 2D. Furthermore, while fragments in 2D are mostly circular, a higher number of rectangular and blob-like shapes are formed on fibers, and, interestingly, each shape is capable of forming protrusive structures. Absent in 2D, fibers' fragments display oscillatory migratory behavior with dramatic shape changes, sometimes remarkably sustained over long durations (>20 h). Immunostaining reveals paxillin distribution along fragment body-fiber length, while Forster Resonance Energy Transfer imaging of vinculin reveals mechanical loading of fragment adhesions comparable to whole cell adhesions. Using nanonet force microscopy, the forces exerted by fragments are estimated, and peculiarly small area fragments can exert forces similar to larger fragments in a Rho-associated kinase dependent manner. Overall, fragment dynamics on 2D substrates are insufficient to describe the mechanosensitivity of fragments to fibers, and the architecture of fiber networks can generate entirely new behaviors.
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Affiliation(s)
- Abinash Padhi
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Brooke E Danielsson
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, Virginia, 23284, USA
| | - Deema S Alabduljabbar
- Department of Biomedical Engineering, University of California, Davis, CA, 95616, USA
| | - Ji Wang
- Department of Engineering Science and Mechanics, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Daniel E Conway
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, Virginia, 23284, USA
| | - Rakesh K Kapania
- Kevin T. Crofton Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Amrinder S Nain
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
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9
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Graybill PM, Jana A, Kapania RK, Nain AS, Davalos RV. Single Cell Forces after Electroporation. ACS NANO 2021; 15:2554-2568. [PMID: 33236888 PMCID: PMC10949415 DOI: 10.1021/acsnano.0c07020] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Exogenous high-voltage pulses increase cell membrane permeability through a phenomenon known as electroporation. This process may also disrupt the cell cytoskeleton causing changes in cell contractility; however, the contractile signature of cell force after electroporation remains unknown. Here, single-cell forces post-electroporation are measured using suspended extracellular matrix-mimicking nanofibers that act as force sensors. Ten, 100 μs pulses are delivered at three voltage magnitudes (500, 1000, and 1500 V) and two directions (parallel and perpendicular to cell orientation), exposing glioblastoma cells to electric fields between 441 V cm-1 and 1366 V cm-1. Cytoskeletal-driven force loss and recovery post-electroporation involves three distinct stages. Low electric field magnitudes do not cause disruption, but higher fields nearly eliminate contractility 2-10 min post-electroporation as cells round following calcium-mediated retraction (stage 1). Following rounding, a majority of analyzed cells enter an unusual and unexpected biphasic stage (stage 2) characterized by increased contractility tens of minutes post-electroporation, followed by force relaxation. The biphasic stage is concurrent with actin disruption-driven blebbing. Finally, cells elongate and regain their pre-electroporation morphology and contractility in 1-3 h (stage 3). With increasing voltages applied perpendicular to cell orientation, we observe a significant drop in cell viability. Experiments with multiple healthy and cancerous cell lines demonstrate that contractile force is a more dynamic and sensitive metric than cell shape to electroporation. A mechanobiological understanding of cell contractility post-electroporation will deepen our understanding of the mechanisms that drive recovery and may have implications for molecular medicine, genetic engineering, and cellular biophysics.
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Affiliation(s)
- Philip M Graybill
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Aniket Jana
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Rakesh K Kapania
- Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Amrinder S Nain
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
- School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University, Blacksburg, Virginia 24061, United States
| | - Rafael V Davalos
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
- School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University, Blacksburg, Virginia 24061, United States
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10
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Padhi A, Singh K, Franco-Barraza J, Marston DJ, Cukierman E, Hahn KM, Kapania RK, Nain AS. Force-exerting perpendicular lateral protrusions in fibroblastic cell contraction. Commun Biol 2020; 3:390. [PMID: 32694539 PMCID: PMC7374753 DOI: 10.1038/s42003-020-01117-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Accepted: 06/29/2020] [Indexed: 02/06/2023] Open
Abstract
Aligned extracellular matrix fibers enable fibroblasts to undergo myofibroblastic activation and achieve elongated shapes. Activated fibroblasts are able to contract, perpetuating the alignment of these fibers. This poorly understood feedback process is critical in chronic fibrosis conditions, including cancer. Here, using fiber networks that serve as force sensors, we identify "3D perpendicular lateral protrusions" (3D-PLPs) that evolve from lateral cell extensions named twines. Twines originate from stratification of cyclic-actin waves traversing the cell and swing freely in 3D to engage neighboring fibers. Once engaged, a lamellum forms and extends multiple secondary twines, which fill in to form a sheet-like PLP, in a force-entailing process that transitions focal adhesions to activated (i.e., pathological) 3D-adhesions. The specific morphology of PLPs enables cells to increase contractility and force on parallel fibers. Controlling geometry of extracellular networks confirms that anisotropic fibrous environments support 3D-PLP formation and function, suggesting an explanation for cancer-associated desmoplastic expansion.
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Affiliation(s)
- Abinash Padhi
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, USA
| | - Karanpreet Singh
- Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA, USA
| | - Janusz Franco-Barraza
- Cancer Biology Program, Marvin & Concetta Greenberg Pancreatic Cancer Institute, Fox Chase Cancer Center, Philadelphia, PA, USA
| | - Daniel J Marston
- Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Edna Cukierman
- Cancer Biology Program, Marvin & Concetta Greenberg Pancreatic Cancer Institute, Fox Chase Cancer Center, Philadelphia, PA, USA.
| | - Klaus M Hahn
- Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Rakesh K Kapania
- Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA, USA
| | - Amrinder S Nain
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, USA.
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Padhi A, Thomson AH, Perry JB, Davis GN, McMillan RP, Loesgen S, Kaweesa EN, Kapania R, Nain AS, Brown DA. Bioenergetics underlying single-cell migration on aligned nanofiber scaffolds. Am J Physiol Cell Physiol 2019; 318:C476-C485. [PMID: 31875698 DOI: 10.1152/ajpcell.00221.2019] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cell migration is centrally involved in a myriad of physiological processes, including morphogenesis, wound healing, tissue repair, and metastatic growth. The bioenergetics that underlie migratory behavior are not fully understood, in part because of variations in cell culture media and utilization of experimental cell culture systems that do not model physiological connective extracellular fibrous networks. In this study, we evaluated the bioenergetics of C2C12 myoblast migration and force production on fibronectin-coated nanofiber scaffolds of controlled diameter and alignment, fabricated using a nonelectrospinning spinneret-based tunable engineered parameters (STEP) platform. The contribution of various metabolic pathways to cellular migration was determined using inhibitors of cellular respiration, ATP synthesis, glycolysis, or glucose uptake. Despite immediate effects on oxygen consumption, mitochondrial inhibition only modestly reduced cell migration velocity, whereas inhibitors of glycolysis and cellular glucose uptake led to striking decreases in migration. The migratory metabolic sensitivity was modifiable based on the substrates present in cell culture media. Cells cultured in galactose (instead of glucose) showed substantial migratory sensitivity to mitochondrial inhibition. We used nanonet force microscopy to determine the bioenergetic factors responsible for single-cell force production and observed that neither mitochondrial nor glycolytic inhibition altered single-cell force production. These data suggest that myoblast migration is heavily reliant on glycolysis in cells grown in conventional media. These studies have wide-ranging implications for the causes, consequences, and putative therapeutic treatments aimed at cellular migration.
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Affiliation(s)
- Abinash Padhi
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia
| | - Alexander H Thomson
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, Virginia
| | - Justin B Perry
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, Virginia
| | - Grace N Davis
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, Virginia
| | - Ryan P McMillan
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, Virginia.,Virginia Tech Metabolism Core, Blacksburg, Virginia
| | - Sandra Loesgen
- Department of Chemistry, Oregon State University, Corvallis, Oregon
| | | | - Rakesh Kapania
- Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, Virginia
| | - Amrinder S Nain
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia
| | - David A Brown
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, Virginia.,Virginia Tech Center for Drug Discovery, Blacksburg, Virginia.,Virginia Tech Metabolism Core, Blacksburg, Virginia
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