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Matsubayashi HT, Mountain J, Takahashi N, Deb Roy A, Yao T, Peterson AF, Saez Gonzalez C, Kawamata I, Inoue T. Non-catalytic role of phosphoinositide 3-kinase in mesenchymal cell migration through non-canonical induction of p85β/AP2-mediated endocytosis. Nat Commun 2024; 15:2612. [PMID: 38521786 PMCID: PMC10960865 DOI: 10.1038/s41467-024-46855-y] [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] [Received: 01/11/2023] [Accepted: 03/13/2024] [Indexed: 03/25/2024] Open
Abstract
Class IA phosphoinositide 3-kinase (PI3K) galvanizes fundamental cellular processes such as migration, proliferation, and differentiation. To enable these multifaceted roles, the catalytic subunit p110 utilizes the multi-domain, regulatory subunit p85 through its inter SH2 domain (iSH2). In cell migration, its product PI(3,4,5)P3 generates locomotive activity. While non-catalytic roles are also implicated, underlying mechanisms and their relationship to PI(3,4,5)P3 signaling remain elusive. Here, we report that a disordered region of iSH2 contains AP2 binding motifs which can trigger clathrin and dynamin-mediated endocytosis independent of PI3K catalytic activity. The AP2 binding motif mutants of p85 aberrantly accumulate at focal adhesions and increase both velocity and persistency in fibroblast migration. We thus propose the dual functionality of PI3K in the control of cell motility, catalytic and non-catalytic, arising distinctly from juxtaposed regions within iSH2.
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Affiliation(s)
- Hideaki T Matsubayashi
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA.
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Tohoku, Japan.
| | - Jack Mountain
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - Nozomi Takahashi
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Tohoku, Japan
| | - Abhijit Deb Roy
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - Tony Yao
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - Amy F Peterson
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - Cristian Saez Gonzalez
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - Ibuki Kawamata
- Department of Robotics, Tohoku University, Tohoku, Japan
- Natural Science Division, Ochanomizu University, Kyoto, Japan
- Graduate School of Science, Kyoto University, Kyoto, Japan
| | - Takanari Inoue
- Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA.
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Llorente A, Loughran RM, Emerling BM. Targeting phosphoinositide signaling in cancer: relevant techniques to study lipids and novel avenues for therapeutic intervention. Front Cell Dev Biol 2023; 11:1297355. [PMID: 37954209 PMCID: PMC10634348 DOI: 10.3389/fcell.2023.1297355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 10/12/2023] [Indexed: 11/14/2023] Open
Abstract
Phosphoinositides serve as essential players in numerous biological activities and are critical for overall cellular function. Due to their complex chemical structures, localization, and low abundance, current challenges in the phosphoinositide field include the accurate measurement and identification of specific variants, particularly those with acyl chains. Researchers are intensively developing innovative techniques and approaches to address these challenges and advance our understanding of the impact of phosphoinositide signaling on cellular biology. This article provides an overview of recent advances in the study of phosphoinositides, including mass spectrometry, lipid biosensors, and real-time activity assays using fluorometric sensors. These methodologies have proven instrumental for a comprehensive exploration of the cellular distribution and dynamics of phosphoinositides and have shed light on the growing significance of these lipids in human health and various pathological processes, including cancer. To illustrate the importance of phosphoinositide signaling in disease, this perspective also highlights the role of a family of lipid kinases named phosphatidylinositol 5-phosphate 4-kinases (PI5P4Ks), which have recently emerged as exciting therapeutic targets for cancer treatment. The ongoing exploration of phosphoinositide signaling not only deepens our understanding of cellular biology but also holds promise for novel interventions in cancer therapy.
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Affiliation(s)
| | | | - Brooke M. Emerling
- Cancer Metabolism and Microenvironment Program, Sanford Burnham Prebys, La Jolla, CA, United States
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Sun J, Song S, Singaram I, Sharma A, Wang W, Hu Y, Lo WT, Koch PA, Zhao JJ, Haucke V, Gao R, Cho W. PI(3,5)P 2 Controls the Signaling Activity of Class I PI3K. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.25.525550. [PMID: 36747849 PMCID: PMC9900776 DOI: 10.1101/2023.01.25.525550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
3'-Phosphoinositides are ubiquitous cellular lipids that play pivotal regulatory roles in health and disease. Generation of 3'-phosphoinositides are driven by three families of phosphoinositide 3-kinases (PI3K) but the mechanisms underlying their regulation and cross-talk are not fully understood. Among 3'-phosphoinositides, phosphatidylinositol-3,5-bisphosphate (PI(3,5)P 2 ) remains the least understood species in terms of its spatiotemporal dynamics and physiological function due to the lack of specific probes. By means of spatiotemporally resolved in situ quantitative imaging of PI(3,5)P 2 using a newly developed ratiometric PI(3,5)P 2 sensor we demonstrate that a special pool of PI(3,5)P 2 is generated on lysosomes and late endosomes in response to growth factor stimulation. This PI(3,5)P 2 pool, the formation of which is mediated by Class II PI3KC2β and PIKFyve, plays a crucial role in terminating the activity of growth factor-stimulated Class I PI3K, one of the most frequently mutated proteins in cancer, via specific interaction with its regulatory p85 subunit. Cancer-causing mutations of Class I PI3K inhibit the p85-PI(3,5)P 2 interaction and thereby induce sustained activation of Class I PI3K. Our results unravel a hitherto unknown tight regulatory interplay between Class I and II PI3Ks mediated by PI(3,5)P 2 , which may be important for controlling the strength of PI3K-mediated growth factor signaling. These results also suggest a new therapeutic possibility of treating cancer patients with p85 mutations.
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Matsubayashi H, Mountain J, Yao T, Peterson A, Roy AD, Inoue T. Non-catalytic role of phosphoinositide 3-kinase in mesenchymal cell migration through non-canonical induction of p85β/AP-2-mediated endocytosis. RESEARCH SQUARE 2023:rs.3.rs-2432041. [PMID: 36712095 PMCID: PMC9882665 DOI: 10.21203/rs.3.rs-2432041/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Class IA phosphoinositide 3-kinase (PI3K) galvanizes fundamental cellular processes such as migration, proliferation, and differentiation. To enable multifaceted roles, the catalytic subunit p110 utilizes a multi-domain, regulatory subunit p85 through its inter SH2 domain (iSH2). In cell migration, their product PI(3,4,5)P3 generates locomotive activity. While non-catalytic roles are also implicated, underlying mechanisms and its relationship to PI(3,4,5)P3 signaling remain elusive. Here, we report that a disordered region of iSH2 contains previously uncharacterized AP-2 binding motifs which can trigger clathrin and dynamin-mediated endocytosis independent of PI3K catalytic activity. The AP-2 binding motif mutants of p85 aberrantly accumulate at focal adhesions and upregulate both velocity and persistency in fibroblast migration. We thus propose the dual functionality of PI3K in the control of cell motility, catalytic and non-catalytic, arising distinctly from juxtaposed regions within iSH2.
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Matsubayashi HT, Mountain J, Yao T, Peterson AF, Deb Roy A, Inoue T. Non-catalytic role of phosphoinositide 3-kinase in mesenchymal cell migration through non-canonical induction of p85β/AP-2-mediated endocytosis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2022.12.31.522383. [PMID: 36712134 PMCID: PMC9881872 DOI: 10.1101/2022.12.31.522383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Class IA phosphoinositide 3-kinase (PI3K) galvanizes fundamental cellular processes such as migration, proliferation, and differentiation. To enable multifaceted roles, the catalytic subunit p110 utilizes a multidomain, regulatory subunit p85 through its inter SH2 domain (iSH2). In cell migration, their product PI(3,4,5)P3 generates locomotive activity. While non-catalytic roles are also implicated, underlying mechanisms and its relationship to PI(3,4,5)P3 signaling remain elusive. Here, we report that a disordered region of iSH2 contains previously uncharacterized AP-2 binding motifs which can trigger clathrin and dynamin-mediated endocytosis independent of PI3K catalytic activity. The AP-2 binding motif mutants of p85 aberrantly accumulate at focal adhesions and upregulate both velocity and persistency in fibroblast migration. We thus propose the dual functionality of PI3K in the control of cell motility, catalytic and non-catalytic, arising distinctly from juxtaposed regions within iSH2.
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Affiliation(s)
- Hideaki T. Matsubayashi
- Department of Cell Biology, School of Medicine, Johns Hopkins University
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University
| | - Jack Mountain
- Department of Cell Biology, School of Medicine, Johns Hopkins University
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University
| | - Tony Yao
- Department of Cell Biology, School of Medicine, Johns Hopkins University
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University
| | - Amy F. Peterson
- Department of Cell Biology, School of Medicine, Johns Hopkins University
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University
| | - Abhijit Deb Roy
- Department of Cell Biology, School of Medicine, Johns Hopkins University
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University
| | - Takanari Inoue
- Department of Cell Biology, School of Medicine, Johns Hopkins University
- Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University
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