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Maeda C, Tsuruta F. Molecular Basis of Neuronal and Microglial States in the Aging Brain and Impact on Cerebral Blood Vessels. Int J Mol Sci 2024; 25:4443. [PMID: 38674028 PMCID: PMC11049950 DOI: 10.3390/ijms25084443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 04/15/2024] [Accepted: 04/17/2024] [Indexed: 04/28/2024] Open
Abstract
Brain aging causes a wide variety of changes at the molecular and cellular levels, leading to the decline of cognitive functions and increased vulnerability to neurodegenerative disorders. The research aimed at understanding the aging of the brain has made much progress in recent decades. Technological innovations such as single-cell RNA-sequencing (scRNA-seq), proteomic analyses, and spatial transcriptomic analyses have facilitated the research on the dynamic changes occurring within neurons, glia, and other cells along with their impacts on intercellular communication during aging. In this review, we introduce recent trends of how neurons and glia change during aging and discuss the impact on the brain microenvironment such as the blood-brain barrier (BBB).
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Affiliation(s)
- Chihiro Maeda
- Master’s and Doctoral Program in Biology, Degree Programs in Life and Earth Sciences, Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Ibaraki, Japan;
| | - Fuminori Tsuruta
- Master’s and Doctoral Programs in Biology, Institute of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Ibaraki, Japan
- Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Ibaraki, Japan
- Ph.D. Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Ibaraki, Japan
- Master’s and Doctoral Program in Neuroscience, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Ibaraki, Japan
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2
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Kim J, Taketomi T, Yamada A, Uematsu Y, Ueda K, Chiba T, Tsuruta F. USP4 regulates TUT1 ubiquitination status in concert with SART3. Biochem Biophys Res Commun 2024; 701:149557. [PMID: 38310689 DOI: 10.1016/j.bbrc.2024.149557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 02/06/2024]
Abstract
The ubiquitin system plays pivotal roles in diverse cellular processes, including signal transduction, transcription and translation, organelle quality control, and protein degradation. Recent investigations have revealed the regulatory influence of ubiquitin systems on RNA metabolism. Previously, we reported that the deubiquitinating enzyme, ubiquitin specific peptidase 15 (USP15), promotes deubiquitination of terminal uridylyl transferase 1 (TUT1), a key regulator within the U4/U6 spliceosome, thereby instigating significant alterations in global RNA splicing [1]. In this study, we report that ubiquitin specific peptidase 4 (USP4), a homologous protein to USP15, also exerts control over the ubiquitination status of TUT1. Analogous to USP15, the expression of USP4 results in a reduction of TUT1 ubiquitination. Furthermore, squamous cell carcinoma antigen recognized by T-cells 3 (SART3) collaborates in enhancing the deubiquitinating activity of USP4 towards TUT1. A crucial revelation is that USP4 orchestrates the subnuclear relocation of TUT1 from the nucleolus to the nucleoplasm and facilitates the stability of U6 small nuclear RNA (snRNA). Notably, USP4 has a more profound effect on TUT1 redistribution compared to USP15. Our findings suggest that USP4 intricately modulates the ubiquitination status of TUT1, thereby exerting pronounced effects on the spliceosome functions.
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Affiliation(s)
- Jaehyun Kim
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Takumi Taketomi
- Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Atsuma Yamada
- College of Biological Sciences, School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Yukino Uematsu
- Master's and Doctoral Program in Biology, Degree Programs in Life and Earth Sciences, Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Kentaro Ueda
- College of Biological Sciences, School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Tomoki Chiba
- Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan; Ph.D. Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan; Master's and Doctoral Program in Biology, Institute of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Fuminori Tsuruta
- Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan; Master's and Doctoral Program in Neuroscience, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan; Ph.D. Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan; Master's and Doctoral Program in Biology, Institute of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan.
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3
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Taketomi T, Tsuruta F. Towards an Understanding of Microglia and Border-Associated Macrophages. Biology (Basel) 2023; 12:1091. [PMID: 37626977 PMCID: PMC10452120 DOI: 10.3390/biology12081091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 07/29/2023] [Accepted: 08/03/2023] [Indexed: 08/27/2023]
Abstract
The central nervous system (CNS) plays a crucial role in regulating bodily functions by sensing and integrating environmental cues and maintaining proper physiological conditions. Recent research has revealed that CNS functions are closely coordinated with the immune system. As even minor disturbances of the immune system in the CNS can lead to various dysfunctions, diseases, or even death, it is highly specialized and segregated from that in peripheral regions. Microglia in the parenchyma and macrophages at the interface between the CNS and peripheral regions are essential immune cells in the CNS that monitor environmental changes. Recent omics analyses have revealed that these cells exhibit highly heterogeneous populations. In this review, we summarize the functions and diversity of microglia in the brain parenchyma and those of macrophages in the border regions, such as the meninges, perivascular spaces, and choroid plexus.
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Affiliation(s)
- Takumi Taketomi
- PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Tsukuba 305-8577, Japan;
| | - Fuminori Tsuruta
- PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Tsukuba 305-8577, Japan;
- Master’s and Doctoral Programs in Biology, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
- PhD Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, Tsukuba 305-8577, Japan
- Master’s and Doctoral Program in Neuroscience, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
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4
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Affiliation(s)
- Takumi Taketomi
- Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Fuminori Tsuruta
- Ph.D. Program in Human Biology, School of Integrative and Global Majors; Master's and Doctoral Programs in Biology, Faculty of Life and Environmental Sciences; Ph.D. Program in Humanics, School of Integrative and Global Majors; Master's and Doctoral Program in Neuroscience, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
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5
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Sato B, Kim J, Morohoshi K, Kang W, Miyado K, Tsuruta F, Kawano N, Chiba T. Proteasome-Associated Proteins, PA200 and ECPAS, Are Essential for Murine Spermatogenesis. Biomolecules 2023; 13:biom13040586. [PMID: 37189334 DOI: 10.3390/biom13040586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 03/16/2023] [Accepted: 03/22/2023] [Indexed: 05/17/2023] Open
Abstract
Proteasomes are highly sophisticated protease complexes that degrade non-lysosomal proteins, and their proper regulation ensures various biological functions such as spermatogenesis. The proteasome-associated proteins, PA200 and ECPAS, are predicted to function during spermatogenesis; however, male mice lacking each of these genes sustain fertility, raising the possibility that these proteins complement each other. To address this issue, we explored these possible roles during spermatogenesis by producing mice lacking these genes (double-knockout mice; dKO mice). Expression patterns and quantities were similar throughout spermatogenesis in the testes. In epididymal sperm, PA200 and ECPAS were expressed but were differentially localized to the midpiece and acrosome, respectively. Proteasome activity was considerably reduced in both the testes and epididymides of dKO male mice, resulting in infertility. Mass spectrometric analysis revealed LPIN1 as a target protein for PA200 and ECPAS, which was confirmed via immunoblotting and immunostaining. Furthermore, ultrastructural and microscopic analyses demonstrated that the dKO sperm displayed disorganization of the mitochondrial sheath. Our results indicate that PA200 and ECPAS work cooperatively during spermatogenesis and are essential for male fertility.
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Affiliation(s)
- Ban Sato
- Master's and Doctoral Program in Biology, Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
- Laboratory of Regulatory Biology, Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashimita, Kawasaki 214-8571, Japan
| | - Jiwoo Kim
- College of Biological Sciences, School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
| | - Kazunori Morohoshi
- Laboratory of Regulatory Biology, Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashimita, Kawasaki 214-8571, Japan
| | - Woojin Kang
- Department of Reproductive Biology, National Research Institute for Child Health and Development, 2-10-1 Okura, Setagaya 157-8535, Japan
| | - Kenji Miyado
- Department of Reproductive Biology, National Research Institute for Child Health and Development, 2-10-1 Okura, Setagaya 157-8535, Japan
| | - Fuminori Tsuruta
- Master's and Doctoral Program in Biology, Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
| | - Natsuko Kawano
- Laboratory of Regulatory Biology, Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashimita, Kawasaki 214-8571, Japan
| | - Tomoki Chiba
- Master's and Doctoral Program in Biology, Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
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6
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Nakamura J, Aihara T, Chiba T, Tsuruta F. Cold shock protein RBM3 is upregulated in the autophagy-deficient brain. MicroPubl Biol 2022; 2022:10.17912/micropub.biology.000695. [PMID: 36601325 PMCID: PMC9807172 DOI: 10.17912/micropub.biology.000695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/22/2022] [Accepted: 12/05/2022] [Indexed: 01/06/2023]
Abstract
Neural autophagy plays an important role in regulating protein quality control, brain homeostasis, and body temperature. However, the mechanism that links a defect in autophagy to body temperature has not been elucidated. Here, we report that RNA binding motif protein 3 (RBM3) is a potential candidate that regulates body temperature. We found that the body temperatures of Nestin-Cre ; Atg7 f/f conditional KO (cKO) mice were lower than that of wild-type (WT) mice. Moreover, RBM3 was upregulated in the Nestin-Cre ; Atg7 f/f brain. These data suggest that RBM3 is an implicit target that maintains body temperature influenced by neural autophagy.
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Affiliation(s)
- Junnosuke Nakamura
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Takuma Aihara
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tomoki Chiba
- Master's and Doctoral Program in Biology, Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
,
Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
,
Ph.D. Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Fuminori Tsuruta
- Master's and Doctoral Program in Biology, Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
,
Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
,
Ph.D. Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
,
Master's and Doctoral Program in Neuroscience, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
,
Correspondence to: Fuminori Tsuruta (
)
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7
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Nosaki S, Kaneko MK, Tsuruta F, Yoshida H, Kato Y, Miura K. Prevention of necrosis caused by transient expression in Nicotiana benthamiana by application of ascorbic acid. Plant Physiol 2021; 186:832-835. [PMID: 33638348 PMCID: PMC8195520 DOI: 10.1093/plphys/kiab102] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 02/18/2021] [Indexed: 05/10/2023]
Abstract
Application of high concentrations of sodium ascorbate suppresses necrosis caused by the expression of recombinant proteins in Nicotiana benthamiana, resulting in an increase in protein accumulation.
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Affiliation(s)
- Shohei Nosaki
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Tsukuba 305-8572, Japan
| | - Mika K Kaneko
- Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Fuminori Tsuruta
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan
| | - Hideki Yoshida
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Tsukuba 305-8572, Japan
| | - Yukinari Kato
- Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
- New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8575, Japan
| | - Kenji Miura
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan
- Tsukuba-Plant Innovation Research Center, University of Tsukuba, Tsukuba 305-8572, Japan
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8
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Okajima T, Tsuruta F. Exploring genes that control microglial heterogeneity and transition. Neural Regen Res 2021; 16:2397-2398. [PMID: 33907015 PMCID: PMC8374591 DOI: 10.4103/1673-5374.313035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Tomomi Okajima
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Fuminori Tsuruta
- Master's and Doctoral Programs in Biology, Faculty of Life and Environmental Sciences; Master's and Doctoral Program in Neuroscience, Graduate School of Comprehensive Human Sciences; PhD Program in Human Biology, School of Integrative and Global Majors; PhD Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, Tsukuba, Ibaraki, Japan
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9
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Affiliation(s)
- Tomomi Okajima
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences; PhD Program in Human Biology, School of Integrative and Global Majors; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba, Ibaraki, Japan
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10
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Kim J, Tsuruta F, Okajima T, Yano S, Sato B, Chiba T. KLHL7 promotes TUT1 ubiquitination associated with nucleolar integrity: Implications for retinitis pigmentosa. Biochem Biophys Res Commun 2017; 494:220-226. [PMID: 29032201 DOI: 10.1016/j.bbrc.2017.10.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 10/10/2017] [Indexed: 01/06/2023]
Abstract
Kelch-like protein 7 (KLHL7) is a component of Cul3-based Cullin-RING ubiquitin ligase. Recent studies have revealed that mutations in klhl7 gene cause several disorders, such as retinitis pigmentosa (RP). Although KLHL7 is considered to be crucial for regulating the protein homeostasis, little is known about its biological functions. In this study, we report that KLHL7 increases terminal uridylyl transferase 1 (TUT1) ubiquitination involved in nucleolar integrity. TUT1 is normally localized in nucleolus; however, expression of KLHL7 facilitates a vulnerability of nucleolar integrity, followed by a decrease of TUT1 localization in nucleolus. On the other hand, pathogenic KLHL7 mutants, which causes an onset of RP, have little effect on both nucleolar integrity and TUT1 localization. Finally, KLHL7 increases TUT1 ubiquitination levels. Taken together, these results imply that KLHL7 is a novel regulator of nucleolus associated with TUT1 ubiquitination. Our study may provide a valuable information to elucidate a pathogenic mechanism of RP.
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Affiliation(s)
- Jaehyun Kim
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
| | - Tomomi Okajima
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Sarasa Yano
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Ban Sato
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
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11
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Tsuruta F, Okajima T, Yano S, Chiba T. Quantification of Endosome and Lysosome Motilities in Cultured Neurons Using Fluorescent Probes. J Vis Exp 2017. [PMID: 28570534 DOI: 10.3791/55488] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
In the brain, membrane trafficking systems play important roles in regulating neuronal functions, such as neuronal morphology, synaptic plasticity, survival, and glial communications. To date, numerous studies have reported that defects in these systems cause various neuronal diseases. Thus, understanding the mechanisms underlying vesicle dynamics may provide influential clues that could aid in the treatment of several neuronal disorders. Here, we describe a method for quantifying vesicle motilities, such as motility distance and rate of movement, using a software plug-in for the ImageJ platform. To obtain images for quantification, we labeled neuronal endosome-lysosome structures with EGFP-tagged vesicle marker proteins and observed the movement of vesicles using a time-lapse microscopy. This method is highly useful and simplify measuring vesicle motility in neurites, such as axons and dendrites, as well as in the soma of both neurons and glial cells. Furthermore, this method can be applied to other cell lines, such as fibroblasts and endothelial cells. This approach could provide a valuable advancement of our understanding of membrane trafficking.
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Affiliation(s)
- Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba; PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba;
| | - Tomomi Okajima
- Graduate School of Life and Environmental Sciences, University of Tsukuba
| | - Sarasa Yano
- Graduate School of Life and Environmental Sciences, University of Tsukuba
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba; PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba
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Fukuda T, Kigoshi-Tansho Y, Naganuma T, Kazaana A, Okajima T, Tsuruta F, Chiba T. CACUL1/CAC1 attenuates p53 activity through PML post-translational modification. Biochem Biophys Res Commun 2016; 482:863-869. [PMID: 27889610 DOI: 10.1016/j.bbrc.2016.11.125] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 11/22/2016] [Indexed: 12/30/2022]
Abstract
Promyelocytic leukaemia (PML) is a tumor suppressor protein covalently conjugated with SUMO family proteins, leading to the formation of PML nuclear bodies (NBs). PML-NBs provide a platform for efficient posttranslational modification of targets and protein-protein interaction, contributing to the adjustment of gene expression and chromatin integrity. Although PML SUMOylation is thought to play important roles in diverse cellular functions, the control mechanisms of adequate modification levels have remained unsolved. Here, we report that Cullin-related protein CACUL1/CAC1 (CACUL1) inhibits PML posttranslational modification. CACUL1 interacts with PML and suppresses PML SUMOylation, leading to the regulation of PML-NB size in the nucleus. We also found that Ubc9, a SUMO-conjugating enzyme, binds to CACUL1 and antagonizes the interaction between CACUL1 and PML. Furthermore, CACUL1 attenuates p53 transcriptional activity. These data suggest that CACUL1 is a novel regulator that negatively controls p53 activity through the regulation of PML SUMOylation.
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Affiliation(s)
- Tomomi Fukuda
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Yu Kigoshi-Tansho
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Takao Naganuma
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Akira Kazaana
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tomomi Okajima
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Life Science Center of Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
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Fukagai K, Waku T, Chowdhury AMMA, Kubo K, Matsumoto M, Kato H, Natsume T, Tsuruta F, Chiba T, Taniguchi H, Kobayashi A. USP15 stabilizes the transcription factor Nrf1 in the nucleus, promoting the proteasome gene expression. Biochem Biophys Res Commun 2016; 478:363-370. [PMID: 27416755 DOI: 10.1016/j.bbrc.2016.07.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 07/08/2016] [Indexed: 02/04/2023]
Abstract
The transcriptional factor Nrf1 (NF-E2-related factor 1) sustains protein homeostasis (proteostasis) by regulating the expression of proteasome genes. Under physiological conditions, the transcriptional activity of Nrf1 is repressed by its sequestration into the endoplasmic reticulum (ER) and furthermore by two independent ubiquitin-proteasome pathways, comprising Hrd1 and β-TrCP in the cytoplasm and nucleus, respectively. However, the molecular mechanisms underlying Nrf1 activation remain unclear. Here, we report that USP15 (Ubiquitin-Specific Protease 15) activates Nrf1 in the nucleus by stabilizing it through deubiquitination. We first identified USP15 as an Nrf1-associated factor through proteome analysis. USP15 physically interacts with Nrf1, and it markedly stabilizes Nrf1 by removing its ubiquitin moieties. USP15 activates the Nrf1-mediated expression of a proteasome gene luciferase reporter and endogenous proteasome activity. The siRNA-mediated knockdown of USP15 diminishes the Nrf1-induced proteasome gene expression in response to proteasome inhibition. These results uncover a new regulatory mechanism that USP15 activates Nrf1 against the β-TrCP inhibition to maintain proteostasis.
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Affiliation(s)
- Kousuke Fukagai
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Tsuyoshi Waku
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - A M Masudul Azad Chowdhury
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Kaori Kubo
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Mariko Matsumoto
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Hiroki Kato
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Tohru Natsume
- National Institutes of Advanced Industrial Science and Technology, Biological Information Research Center (JBIRC), Tokyo, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Hiroaki Taniguchi
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Akira Kobayashi
- Laboratory for Genetic Code, Graduate School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan.
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14
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Tsuruta F. New insights into the functions of PtdIns(3,5)P2 in the pathogenisis of neurodegenerative disorders. Neural Regen Res 2016; 11:240-1. [PMID: 27073373 PMCID: PMC4810984 DOI: 10.4103/1673-5374.177727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Affiliation(s)
- Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, Japan
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15
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Haratake K, Sato A, Tsuruta F, Chiba T. KIAA0368-deficiency affects disassembly of 26S proteasome under oxidative stress condition. J Biochem 2016; 159:609-18. [PMID: 26802743 DOI: 10.1093/jb/mvw006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 12/14/2015] [Indexed: 11/14/2022] Open
Abstract
Many cellular stresses cause damages of intracellular proteins, which are eventually degraded by the ubiquitin and proteasome system. The proteasome is a multicatalytic protease complex composed of 20S core particle and the proteasome activators that regulate the proteasome activity. Extracellular mutants 29 (Ecm29) is a 200 kDa protein encoded by KIAA0368 gene, associates with the proteasome, but its role is largely unknown. Here, we generated KIAA0368-deficient mice and investigated the function of Ecm29 in stress response. KIAA0368-deficient mice showed normal peptidase activity and proteasome formation at normal condition. Under stressed condition, 26S proteasome dissociates in wild-type cells, but not in KIAA0368(-/-) cells. This response was correlated with efficient degradation of damaged proteins and resistance to oxidative stress of KIAA0368(-/-) cells. Thus, Ecm29 is involved in the dissociation process of 26S proteasome, providing clue to analyse the mechanism of proteasomal degradation under various stress condition.
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Affiliation(s)
- Kousuke Haratake
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Akitsugu Sato
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
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16
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Tsuruta F, Kim J, Fukuda T, Kigoshi Y, Chiba T. The intronic region of Fbxl12 functions as an alternative promoter regulated by UV irradiation. Biochem Biophys Rep 2015; 3:100-107. [PMID: 29124172 PMCID: PMC5668677 DOI: 10.1016/j.bbrep.2015.07.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Revised: 06/28/2015] [Accepted: 07/15/2015] [Indexed: 12/30/2022] Open
Abstract
The ubiquitin ligases, SCF complexes, consist of Cul1, Skp1, Rbx1 and the substrate recognition components F-box proteins. Previous studies have reported that one of these F-box proteins, Fbl12, which is produced by Fbxl12 gene, regulates both cell cycle and differentiation. In this paper, we show that the intronic region of Fbxl12 gene acts as an alternative promoter and induces expression of a short form of Fbl12 that lacks F-box domain (Fbl12ΔF). We also found that UV irradiation increases Fbl12ΔF mRNA in cells. Finally, Fbl12ΔF may promote the subcellular localization of Fbl12 from nucleus to cytoplasm through their binding. Our data provide the possibility that Fbl12ΔF induced by alternative promoter controls the SCFFbl12 activity in response to UV stimulation.
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Affiliation(s)
- Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Jaehyun Kim
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tomomi Fukuda
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Yu Kigoshi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
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17
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Qian MX, Pang Y, Liu CH, Haratake K, Du BY, Ji DY, Wang GF, Zhu QQ, Song W, Yu Y, Zhang XX, Huang HT, Miao S, Chen LB, Zhang ZH, Liang YN, Liu S, Cha H, Yang D, Zhai Y, Komatsu T, Tsuruta F, Li H, Cao C, Li W, Li GH, Cheng Y, Chiba T, Wang L, Goldberg AL, Shen Y, Qiu XB. Acetylation-mediated proteasomal degradation of core histones during DNA repair and spermatogenesis. Cell 2013; 153:1012-24. [PMID: 23706739 DOI: 10.1016/j.cell.2013.04.032] [Citation(s) in RCA: 220] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 03/11/2013] [Accepted: 04/08/2013] [Indexed: 01/12/2023]
Abstract
Histone acetylation plays critical roles in chromatin remodeling, DNA repair, and epigenetic regulation of gene expression, but the underlying mechanisms are unclear. Proteasomes usually catalyze ATP- and polyubiquitin-dependent proteolysis. Here, we show that the proteasomes containing the activator PA200 catalyze the polyubiquitin-independent degradation of histones. Most proteasomes in mammalian testes ("spermatoproteasomes") contain a spermatid/sperm-specific α subunit α4 s/PSMA8 and/or the catalytic β subunits of immunoproteasomes in addition to PA200. Deletion of PA200 in mice abolishes acetylation-dependent degradation of somatic core histones during DNA double-strand breaks and delays core histone disappearance in elongated spermatids. Purified PA200 greatly promotes ATP-independent proteasomal degradation of the acetylated core histones, but not polyubiquitinated proteins. Furthermore, acetylation on histones is required for their binding to the bromodomain-like regions in PA200 and its yeast ortholog, Blm10. Thus, PA200/Blm10 specifically targets the core histones for acetylation-mediated degradation by proteasomes, providing mechanisms by which acetylation regulates histone degradation, DNA repair, and spermatogenesis.
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Affiliation(s)
- Min-Xian Qian
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, and College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
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18
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Hall DD, Dai S, Tseng PY, Malik Z, Nguyen M, Matt L, Schnizler K, Shephard A, Mohapatra DP, Tsuruta F, Dolmetsch RE, Christel CJ, Lee A, Burette A, Weinberg RJ, Hell JW. Competition between α-actinin and Ca²⁺-calmodulin controls surface retention of the L-type Ca²⁺ channel Ca(V)1.2. Neuron 2013; 78:483-97. [PMID: 23664615 DOI: 10.1016/j.neuron.2013.02.032] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2013] [Indexed: 12/30/2022]
Abstract
Regulation of neuronal excitability and cardiac excitation-contraction coupling requires the proper localization of L-type Ca²⁺ channels. We show that the actin-binding protein α-actinin binds to the C-terminal surface targeting motif of α11.2, the central pore-forming Ca(V)1.2 subunit, in order to foster its surface expression. Disruption of α-actinin function by dominant-negative or small hairpin RNA constructs reduces Ca(V)1.2 surface localization in human embryonic kidney 293 and neuronal cultures and dendritic spine localization in neurons. We demonstrate that calmodulin displaces α-actinin from their shared binding site on α11.2 upon Ca²⁺ influx through L-type channels, but not through NMDAR, thereby triggering loss of Ca(V)1.2 from spines. Coexpression of a Ca²⁺-binding-deficient calmodulin mutant does not affect basal Ca(V)1.2 surface expression but inhibits its internalization upon Ca²⁺ influx. We conclude that α-actinin stabilizes Ca(V)1.2 at the plasma membrane and that its displacement by Ca²⁺-calmodulin triggers Ca²⁺-induced endocytosis of Ca(V)1.2, thus providing an important negative feedback mechanism for Ca²⁺ influx.
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Affiliation(s)
- Duane D Hall
- Department of Pharmacology, University of Iowa, Iowa City, IA 52242, USA
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19
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Ebina M, Tsuruta F, Katoh MC, Kigoshi Y, Someya A, Chiba T. Myeloma overexpressed 2 (Myeov2) regulates L11 subnuclear localization through Nedd8 modification. PLoS One 2013; 8:e65285. [PMID: 23776465 PMCID: PMC3680436 DOI: 10.1371/journal.pone.0065285] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 04/23/2013] [Indexed: 11/18/2022] Open
Abstract
Nucleolus is a dynamic structure that controls biogenesis of ribosomal RNA and senses cellular stresses. Nucleolus contains a number of proteins including ribosomal proteins that conduct cellular stresses to downstream signaling such as p53 pathway. Recently, it has been reported that modification by a ubiquitin-like molecule, Nedd8, regulates subnuclear localization of ribosomal protein L11. Most of L11 is normally localized and neddylated in nucleolus. However, cellular stress triggers deneddylation and redistribution of L11, and subsequent activation of p53. Although Nedd8 modification is thought to be important for L11 localization, the mechanism of how neddylation of L11 is regulated remains largely unknown. Here, we show that Myeloma overexpressed 2 (Myeov2) controls L11 localization through down-regulation of Nedd8 modification. Expression of Myeov2 reduced neddylation of proteins including L11. We also found that Myeov2 associates with L11 and withholds L11 in nucleoplasm. Although Myeov2 interacted with a Nedd8 deconjugation enzyme COP9 signalosome, L11 deneddylation was mediated by another deneddylase Nedp1, independently of Myeov2. Finally, p53 transcriptional activity is upregulated by Myeov2 expression. These data demonstrate that Myeov2 hampers L11 neddylation through their interactions and confines L11 to nucleoplasm to modulate nucleolar integrity. Our findings provide a novel link between oncogenic stress and p53 pathway and may shed light on the protective mechanism against cancer.
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Affiliation(s)
- Manato Ebina
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- * E-mail: (FT); (TC)
| | - Megumi C. Katoh
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Yu Kigoshi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Akie Someya
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- * E-mail: (FT); (TC)
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20
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Takashima O, Tsuruta F, Kigoshi Y, Nakamura S, Kim J, Katoh MC, Fukuda T, Irie K, Chiba T. Brap2 regulates temporal control of NF-κB localization mediated by inflammatory response. PLoS One 2013; 8:e58911. [PMID: 23554956 PMCID: PMC3598860 DOI: 10.1371/journal.pone.0058911] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 02/08/2013] [Indexed: 11/18/2022] Open
Abstract
Nuclear factor-kappaB (NF-κB) is critical for the expression of multiple genes involved in inflammatory responses and cellular survival. NF-κB is normally sequestered in the cytoplasm through interaction with an inhibitor of NF-κB (IκB), but inflammatory stimulation induces proteasomal degradation of IκB, followed by NF-κB nuclear translocation. The degradation of IκB is mediated by a SCF (Skp1-Cullin1-F-box protein)-type ubiquitin ligase complex that is post-translationaly modified by a ubiquitin-like molecule Nedd8. In this study, we report that BRCA1-associated protein 2 (Brap2) is a novel Nedd8-binding protein that interacts with SCF complex, and is involved in NF-κB translocation following TNF-α stimulation. We also found a putative neddylation site in Brap2 associated with NF-κB activity. Our findings suggest that Brap2 is a novel modulator that associates with SCF complex and controls TNF-α-induced NF-κB nuclear translocation.
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Affiliation(s)
- Osamu Takashima
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Fuminori Tsuruta
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Yu Kigoshi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Shingo Nakamura
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Jaehyun Kim
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Megumi C. Katoh
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Tomomi Fukuda
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Kenji Irie
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
| | - Tomoki Chiba
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
- * E-mail:
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21
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Takahashi M, Obayashi M, Ishiguro T, Sato N, Niimi Y, Ozaki K, Mogushi K, Mahmut Y, Tanaka H, Tsuruta F, Dolmetsch R, Yamada M, Takahashi H, Kato T, Mori O, Eishi Y, Mizusawa H, Ishikawa K. Cytoplasmic location of α1A voltage-gated calcium channel C-terminal fragment (Cav2.1-CTF) aggregate is sufficient to cause cell death. PLoS One 2013; 8:e50121. [PMID: 23505410 PMCID: PMC3591409 DOI: 10.1371/journal.pone.0050121] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Accepted: 10/17/2012] [Indexed: 01/20/2023] Open
Abstract
The human α1A voltage-dependent calcium channel (Cav2.1) is a pore-forming essential subunit embedded in the plasma membrane. Its cytoplasmic carboxyl(C)-tail contains a small poly-glutamine (Q) tract, whose length is normally 4∼19 Q, but when expanded up to 20∼33Q, the tract causes an autosomal-dominant neurodegenerative disorder, spinocerebellar ataxia type 6 (SCA6). A recent study has shown that a 75-kDa C-terminal fragment (CTF) containing the polyQ tract remains soluble in normal brains, but becomes insoluble mainly in the cytoplasm with additional localization to the nuclei of human SCA6 Purkinje cells. However, the mechanism by which the CTF aggregation leads to neurodegeneration is completely elusive, particularly whether the CTF exerts more toxicity in the nucleus or in the cytoplasm. We tagged recombinant (r)CTF with either nuclear-localization or nuclear-export signal, created doxycyclin-inducible rat pheochromocytoma (PC12) cell lines, and found that the CTF is more toxic in the cytoplasm than in the nucleus, the observations being more obvious with Q28 (disease range) than with Q13 (normal-length). Surprisingly, the CTF aggregates co-localized both with cAMP response element-binding protein (CREB) and phosphorylated-CREB (p-CREB) in the cytoplasm, and Western blot analysis showed that the quantity of CREB and p-CREB were both decreased in the nucleus when the rCTF formed aggregates in the cytoplasm. In human brains, polyQ aggregates also co-localized with CREB in the cytoplasm of SCA6 Purkinje cells, but not in other conditions. Collectively, the cytoplasmic Cav2.1-CTF aggregates are sufficient to cause cell death, and one of the pathogenic mechanisms may be abnormal CREB trafficking in the cytoplasm and reduced CREB and p-CREB levels in the nuclei.
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Affiliation(s)
- Makoto Takahashi
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Masato Obayashi
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Taro Ishiguro
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Nozomu Sato
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Yusuke Niimi
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Kokoro Ozaki
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Kaoru Mogushi
- Information Center for Medical Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Yasen Mahmut
- Information Center for Medical Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Hiroshi Tanaka
- Information Center for Medical Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Fuminori Tsuruta
- Department of Neurobiology, Stanford University School of Medicine, Fairchild Research Building, Palo Alto, California, United States of America
| | - Ricardo Dolmetsch
- Department of Neurobiology, Stanford University School of Medicine, Fairchild Research Building, Palo Alto, California, United States of America
| | - Mitsunori Yamada
- Department of Pathology, Pathological Neuroscience Branch, Brain Research Institute, Niigata University, Asahi-machi-dori, Niigata, Japan
- Department of Clinical Research, National Hospital Organization, Saigata National Hospital, Saigata, Ohgata-ku, Johetsu-City, Niigata, Japan
| | - Hitoshi Takahashi
- Department of Pathology, Pathological Neuroscience Branch, Brain Research Institute, Niigata University, Asahi-machi-dori, Niigata, Japan
| | - Takeo Kato
- Department of Neurology, Hematology, Metabolism, Endocrinology and Diabetology, Yamagata University Faculty of Medicine, Iida-Nishi, Yamagata, Japan
| | - Osamu Mori
- Department of Internal Medicine and Neurology, Hatsuishi Hospital, Nishihara, Kashiwa, Chiba, Japan
| | - Yoshinobu Eishi
- Department of Pathology, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Hidehiro Mizusawa
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Kinya Ishikawa
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
- * E-mail:
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22
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Takashima O, Tsuruta F, Ebina M, Kigoshi Y, Nakamura S, Chiba T. A novel NEDD8-binding protein modulates NF-κB signaling pathway. Arthritis Res Ther 2012. [PMCID: PMC3332438 DOI: 10.1186/ar3601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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23
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Kigoshi Y, Tsuruta F, Chiba T. Ubiquitin ligase activity of Cul3-KLHL7 protein is attenuated by autosomal dominant retinitis pigmentosa causative mutation. J Biol Chem 2011; 286:33613-21. [PMID: 21828050 DOI: 10.1074/jbc.m111.245126] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Substrate-specific protein degradation mediated by the ubiquitin proteasome system (UPS) is crucial for the proper function of the cell. Proteins are specifically recognized and ubiquitinated by the ubiquitin ligases (E3s) and are then degraded by the proteasome. BTB proteins act as the substrate recognition subunit that recruits their cognate substrates to the Cullin 3-based multisubunit E3s. Recently, it was reported that missense mutations in KLHL7, a BTB-Kelch protein, are related to autosomal dominant retinitis pigmentosa (adRP). However, the involvement of KLHL7 in the UPS and the outcome of the adRP causative mutations were unknown. In this study, we show that KLHL7 forms a dimer, assembles with Cul3 through its BTB and BACK domains, and exerts E3 activity. Lys-48-linked but not Lys-63-linked polyubiquitin chain co-localized with KLHL7, which increased upon proteasome inhibition suggesting that KLHL7 mediates protein degradation via UPS. An adRP-causative missense mutation in the BACK domain of KLHL7 attenuated only the Cul3 interaction but not dimerization. Nevertheless, the incorporation of the mutant as a heterodimer in the Cul3-KLHL7 complex diminished the E3 ligase activity. Together, our results suggest that KLHL7 constitutes a Cul3-based E3 and that the disease-causing mutation inhibits ligase activity in a dominant negative manner, which may lead to the inappropriate accumulation of the substrates targeted for proteasomal degradation.
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Affiliation(s)
- Yu Kigoshi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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24
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Abstract
Voltage-gated Ca(2+) channels (VGCCs) play a key role in neuronal signaling but can also contribute to cellular dysfunction and death under pathological conditions such as stroke and neurodegenerative diseases. We report that activation of N-methyl-D-aspartic acid receptors causes internalization and degradation of Ca(V)1.2 channels, resulting in decreased Ca(2+) entry and reduced toxicity. Ca(V)1.2 internalization and degradation requires binding to phosphatidylinositol 3-phosphate 5-kinase (PIKfyve), a lipid kinase which generates phosphatidylinositol (3,5)-bisphosphate (PtdIns(3,5)P(2)) and regulates endosome and lysosome function. Sustained activation of glutamate receptors recruits PIKfyve to Ca(V)1.2 channels, increases cellular levels of PtdIns(3,5)P(2), and promotes targeting of Ca(V)1.2 to lysosomes. Knockdown of PIKfyve prevents Ca(V)1.2 degradation and increases neuronal susceptibility to excitotoxicity. These experiments identify a novel mechanism by which neurons are protected from excitotoxicity and provide a possible explanation for neuronal death in diseases caused by mutations that affect PtdIns(3,5)P(2) regulation.
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Affiliation(s)
- Fuminori Tsuruta
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA
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25
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Gomez-Ospina N, Tsuruta F, Barreto-Chang O, Hu L, Dolmetsch R. The C terminus of the L-type voltage-gated calcium channel Ca(V)1.2 encodes a transcription factor. Cell 2006; 127:591-606. [PMID: 17081980 PMCID: PMC1750862 DOI: 10.1016/j.cell.2006.10.017] [Citation(s) in RCA: 249] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2006] [Revised: 07/25/2006] [Accepted: 10/16/2006] [Indexed: 12/14/2022]
Abstract
Voltage-gated calcium channels play a central role in regulating the electrical and biochemical properties of neurons and muscle cells. One of the ways in which calcium channels regulate long-lasting neuronal properties is by activating signaling pathways that control gene expression, but the mechanisms that link calcium channels to the nucleus are not well understood. We report that a C-terminal fragment of Ca(V)1.2, an L-type voltage-gated calcium channel (LTC), translocates to the nucleus and regulates transcription. We show that this calcium channel associated transcription regulator (CCAT) binds to a nuclear protein, associates with an endogenous promoter, and regulates the expression of a wide variety of endogenous genes important for neuronal signaling and excitability. The nuclear localization of CCAT is regulated both developmentally and by changes in intracellular calcium. These findings provide evidence that voltage-gated calcium channels can directly activate transcription and suggest a mechanism linking voltage-gated channels to the function and differentiation of excitable cells.
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Affiliation(s)
- Natalia Gomez-Ospina
- Department of Neurobiology, Stanford University School of Medicine, 299 Campus Drive, Stanford, CA 94305, USA
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Abstract
Life and death decisions are made by integrating a variety of apoptotic and survival signals in mammalian cells. Therefore, there is likely to be a common mechanism that integrates multiple signals adjudicating between the alternatives. In this study, we propose that 14-3-3 represents such an integration point. Several proapoptotic proteins commonly become associated with 14-3-3 upon phosphorylation by survival-mediating kinases such as Akt. We reported previously that cellular stresses induce c-Jun NH2-terminal kinase (JNK)-mediated 14-3-3zeta phosphorylation at Ser184 (Tsuruta, F., J. Sunayama, Y. Mori, S. Hattori, S. Shimizu, Y. Tsujimoto, K. Yoshioka, N. Masuyama, and Y. Gotoh. 2004. EMBO J. 23:1889-1899). Here, we show that phosphorylation of 14-3-3 by JNK releases the proapoptotic proteins Bad and FOXO3a from 14-3-3 and antagonizes the effects of Akt signaling. As a result of dissociation, Bad is dephosphorylated and translocates to the mitochondria, where it associates with Bcl-2/Bcl-x(L). Because Bad and FOXO3a share the 14-3-3-binding motif with other proapoptotic proteins, we propose that this JNK-mediated phosphorylation of 14-3-3 regulates these proapoptotic proteins in concert and makes cells more susceptible to apoptotic signals.
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Affiliation(s)
- Jun Sunayama
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan
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Tsuruta F, Sunayama J, Mori Y, Hattori S, Shimizu S, Tsujimoto Y, Yoshioka K, Masuyama N, Gotoh Y. JNK promotes Bax translocation to mitochondria through phosphorylation of 14-3-3 proteins. EMBO J 2004; 23:1889-99. [PMID: 15071501 PMCID: PMC394248 DOI: 10.1038/sj.emboj.7600194] [Citation(s) in RCA: 414] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2003] [Accepted: 03/08/2004] [Indexed: 01/06/2023] Open
Abstract
Targeted gene disruption studies have established that the c-Jun NH2-terminal kinase (JNK) is required for the stress-induced release of mitochondrial cytochrome c and apoptosis, and that the Bax subfamily of Bcl-2-related proteins is essential for JNK-dependent apoptosis. However, the mechanism by which JNK regulates Bax has remained unsolved. Here we demonstrate that activated JNK promotes Bax translocation to mitochondria through phosphorylation of 14-3-3, a cytoplasmic anchor of Bax. Phosphorylation of 14-3-3 led to dissociation of Bax from this protein. Expression of phosphorylation-defective mutants of 14-3-3 blocked JNK-induced Bax translocation to mitochondria, cytochrome c release and apoptosis. Collectively, these results have revealed a key mechanism of Bax regulation in stress-induced apoptosis.
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Affiliation(s)
- Fuminori Tsuruta
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Jun Sunayama
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Yasunori Mori
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Seisuke Hattori
- Division of Cellular Genome Proteomics, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo, Japan
| | - Shigeomi Shimizu
- Department of Post-Genomics & Disease, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Yoshihide Tsujimoto
- Department of Post-Genomics & Disease, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Katsuji Yoshioka
- Division of Cell Cycle Regulation, Cancer Research Institute, Kanazawa University, Takara-machi, Kanazawa, Japan
| | - Norihisa Masuyama
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Yukiko Gotoh
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
- PRESTO Research Project, Japan Science and Technology Corporation, Tokyo, Japan
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Abstract
Bax, a proapoptotic member of the Bcl-2 family, localizes largely in the cytoplasm but redistributes to mitochondria in response to apoptotic stimuli, where it induces cytochrome c release. In this study, we show that the phosphatidylinositol 3-OH kinase (PI3K)-Akt pathway plays an important role in the regulation of Bax subcellular localization. We found that LY294002, a PI3K inhibitor, blocked the effects of serum to prevent Bax translocation to mitochondria and that expression of an active form of PI3K suppressed staurosporine-induced Bax translocation, suggesting that PI3K activity is essential for retaining Bax in the cytoplasm. In contrast, both U0126, a MEK inhibitor, and active MEK had little effect on Bax localization. In respect to downstream effectors of PI3K, we found that expression of active Akt, but not serum and glucocorticoid-induced protein kinase (SGK), suppressed staurosporine-induced translocation of Bax, whereas dominant negative Akt moderately promoted Bax translocation. Expression of Akt did not alter the levels of Bax, Bcl-2, Bcl-X(L), or phosphorylated JNK under the conditions used, suggesting that there were alternative mechanisms for Akt in the suppression of Bax translocation. Collectively, these results suggest that the PI3K-Akt pathway inhibits Bax translocation from cytoplasm to mitochondria and have revealed a novel mechanism by which the PI3K-Akt pathway promotes survival.
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Affiliation(s)
- Fuminori Tsuruta
- Institute of Molecular and Cellular Biosciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
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Kawai K, Hirota T, Muramatsu S, Tsuruta F, Ikeda T, Kobashi K, Nakamura KI. Intestinal absorption and excretion of troglitazone sulphate, a major biliary metabolite of troglitazone. Xenobiotica 2000; 30:707-15. [PMID: 10963061 DOI: 10.1080/00498250050078011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
1. Deconjugation by sulphate transfer and intestinal absorption of troglitazone sulphate (M1), the major metabolite of a thiazolidinedione antidiabetic drug, troglitazone, were studied in the male F344 rat using 14C-troglitazone, 4C-M1 and 35S-M1. 2. Some part of M1, produced in the liver and excreted mostly in the bile, was deconjugated in the intestine to the parent compound, troglitazone, by arylsulphate sulphotransferase originated from intestinal flora. However, deconjugation of M1 was not catalyzed by arylsulphatases. Caecal injection of M1 led to the appearance of troglitazone and M1 in plasma. 3. Biliary excretion mostly as M1, and, following absorption, as M1 and troglitazone after deconjugation, were indicated as the basis for the enterohepatic circulation of troglitazone. 4. Enterohepatic circulation may prolong the pharmacological effects of troglitazone.
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Affiliation(s)
- K Kawai
- Drug Metabolism and Pharmacokinetics Research Laboratories, Sankyo Co., Ltd., Tokyo, Japan.
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Kawai K, Kawasaki-Tokui Y, Odaka T, Tsuruta F, Kazui M, Iwabuchi H, Nakamura T, Kinoshita T, Ikeda T, Yoshioka T, Komai T, Nakamura K. Disposition and metabolism of the new oral antidiabetic drug troglitazone in rats, mice and dogs. Arzneimittelforschung 1997; 47:356-68. [PMID: 9150855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The pharmacokinetics of troglitazone (CAS 97322-87-7, CS-045), a new oral antidiabetic drug for the treatment of non-insulin-dependent diabetes mellitus (NIDDM), were investigated in rats, mice and dogs following oral and intravenous administration of 14C-labeled troglitazone at doses of 5 mg/kg. The absorption rates, calculated from the AUC ratios of total radioactivity after oral and intravenous administration, or from the biliary excretion rate after intraduodenal administration in rats were both as high as 75%. High uptake by the liver, one of the pharmacological target organs, was demonstrated in both rats and mice. Furthermore, in the KK mouse, an obese NIDDM model animal, the radioactivity was incorporated selectively as troglitazone itself to muscle, the peripheral target organ. Troglitazone reversibly bound to serum albumin with a high ratio (> 99%). Troglitazone was mostly metabolized to the conjugates: sulfate (M 1) and glucuronide (M 2). The oxidized metabolite, a quinone-type metabolite (M 3), was found to be further metabolized to the sulfate (U 2). The biliary excretion rates of these conjugates were high in each animal, and the occurrence of enterohepatic circulation of the conjugates was also suggested. Sex differences in pharmacokinetics were observed in rats; i.e. females showed a higher plasma concentration of troglitazone, and a lower concentration of M 1, than males, and they excreted the sex-related metabolite, a hydroxylated M 1 (U 1), in the bile.
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Affiliation(s)
- K Kawai
- Analytical and Metabolic Research Laboratories, Sankyo Co., Ltd., Tokyo, Japan
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Tsuruta F, Fujiwara I, Yamamoto Y, Hayakawa Y, Kurosaki N. [Statistical survey of temporomandibular dysfunction]. Kokubyo Gakkai Zasshi 1986; 53:608-14. [PMID: 3492580 DOI: 10.5357/koubyou.53.608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Kawamoto R, Nishiyama K, Tanigawa M, Maeda K, Tsuruta F. [Students' interpretation of the importance of nursing activities]. Kango Tenbo 1981; 6:565-73. [PMID: 6911382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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