1
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Kim Y, Ko HR, Hwang I, Ahn JY. ErbB3 binding protein 1 contributes to adult hippocampal neurogenesis by modulating Bmp4 and Ascl1 signaling. BMB Rep 2024; 57:182-187. [PMID: 37817439 PMCID: PMC11058358] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 08/30/2023] [Accepted: 09/28/2023] [Indexed: 10/12/2023] Open
Abstract
Neural stem cells (NSCs) in the adult hippocampus divide infrequently; the endogenous molecules modulating adult hippocampal neurogenesis (AHN) remain largely unknown. Here, we show that ErbB3 binding protein 1 (Ebp1), which plays important roles in embryonic neurodevelopment, acts as an essential modulator of adult neurogenic factors. In vivo analysis of Ebp1 neuron depletion mice showed impaired AHN with a low number of hippocampal NSCs and neuroblasts. Ebp1 leads to transcriptional repression of Bmp4 and suppression of Ascl1 promoter methylation in the dentate gyrus of the adult hippocampus reflecting an unusually high level of Bmp4 and low Ascl1 level in neurons of Ebp1-deficient mice. Therefore, our findings suggests that Ebp1 could act as an endogenous modulator of the interplay between Bmp4 and Ascl1/Notch signaling, contributing to AHN. [BMB Reports 2024; 57(4): 182-187].
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Affiliation(s)
- Youngkwan Kim
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Inwoo Hwang
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
- Samsung Biomedical Research Institute, Samsung Medical Center, Seoul 06351, Korea
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2
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Hwang I, Kim BS, Ko HR, Cho S, Lee HY, Cho SW, Ryu D, Shim S, Ahn JY. Cerebellar dysfunction and schizophrenia-like behavior in Ebp1-deficient mice. Mol Psychiatry 2022; 27:2030-2041. [PMID: 35165395 DOI: 10.1038/s41380-022-01458-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 01/05/2022] [Accepted: 01/18/2022] [Indexed: 11/10/2022]
Abstract
Cerebellar deficits with Purkinje cell (PCs) loss are observed in several neurologic disorders. However, the underlying mechanisms as to how the cerebellum is affected during development remain unclear. Here we demonstrated that specific inactivation of murine Ebp1 in the central nervous system causes a profound neuropathology characterized by reduced cerebellar volume and PCs loss with abnormal dendritic development, leading to phenotypes including motor defects and schizophrenia (SZ)-like behaviors. Loss of Ebp1 leads to untimely gene expression of Fbxw7, an E3 ubiquitin ligase, resulting in aberrant protein degradation of PTF1A, thereby eliciting cerebellar defects. Reinstatement of Ebp1, but not the Ebp1-E183Ter mutant found in SZ patients, reconstituted cerebellar architecture with increased PCs numbers and improved behavioral phenotypes. Thus, our findings indicate a crucial role for EBP1 in cerebellar development, and define a molecular basis for the cerebellar contribution to neurologic disorders such as SZ.
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Affiliation(s)
- Inwoo Hwang
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Byeong-Seong Kim
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Seongbong Cho
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Ho Yun Lee
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, Seoul, 05505, South Korea
| | - Dongryeol Ryu
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Sungbo Shim
- Department of Biochemistry, Chungbuk National University, Cheongju, South Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea. .,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea. .,Samsung Biomedical Research Institute, Samsung Medical Center, Seoul, 06351, South Korea.
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3
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Yun T, Ko HR, Jo DG, Park KW, Cho SW, Kim J, Ahn JY. Correction to: Inhibitor of DNA binding 2 (Id2) mediates microtubule polymerization in the brain by regulating αK40 acetylation of α-tubulin. Cell Death Discov 2021; 7:279. [PMID: 34625533 PMCID: PMC8501019 DOI: 10.1038/s41420-021-00673-z] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Taegwan Yun
- Department of Molecular Cell Biology, University School of Medicine, 16419, Suwon, Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, University School of Medicine, 16419, Suwon, Korea.,Single Cell Network Research Center Sungkyunkwan, University School of Medicine, 16419, Suwon, Korea
| | - Dong-Gyu Jo
- Department of Health Science and Technology, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, 06351, Seoul, Korea.,School of Pharmacy, Sungkyunkwan University, 16419, Suwon, Korea
| | - Kye Won Park
- Department of Food Science and Biotechnology, Sungkyunkwan University, 16419, Suwon, Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, 05505, Seoul, Korea
| | - Jihoe Kim
- Department of Medical Biotechnology, Yeungnam University, 38541, Gyeongsan, Republic of Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, University School of Medicine, 16419, Suwon, Korea. .,Single Cell Network Research Center Sungkyunkwan, University School of Medicine, 16419, Suwon, Korea. .,Department of Health Science and Technology, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, 06351, Seoul, Korea. .,Samsung Biomedical Research Institute, Samsung Medical Center, 06351, Seoul, Korea.
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4
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Yun T, Ko HR, Jo DG, Park KW, Cho SW, Kim J, Ahn JY. Inhibitor of DNA binding 2 (Id2) mediates microtubule polymerization in the brain by regulating αK40 acetylation of α-tubulin. Cell Death Discov 2021; 7:257. [PMID: 34548475 PMCID: PMC8455547 DOI: 10.1038/s41420-021-00652-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 08/22/2021] [Accepted: 09/07/2021] [Indexed: 12/03/2022] Open
Abstract
Acetylation of α-tubulin lysine 40 (αK40) contributes to microtubule (MT) stability and is essential for neuronal development and function, whereas excessive αK40 deacetylation is observed in neurodegenerative disorders including Alzheimer’s disease (AD). Here we identified inhibitor of DNA binding 2 (Id2) as a novel MT-binding partner that interacts with α-tubulin and enhances αK40 acetylation, leading to MT polymerization in the neurons. Commensurate with our finding that the low levels of Id2 expression along with a reduced αK40 acetylation in the postmortem human AD patient and 5X-FAD, AD model mice brain, Id2 upregulation in the hippocampus of 5X-FAD, which exhibit high levels of Sirt2 expression, increased αK40 acetylation and reconstitutes axon growth. Hence our study suggests that Id2 is critical for maintaining MT stability during neural development and the potential of Id2 to counteract pathogenic Sirt2 activity in AD.
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Affiliation(s)
- Taegwan Yun
- Department of Molecular Cell Biology, University School of Medicine, 16419, Suwon, Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, University School of Medicine, 16419, Suwon, Korea.,Single Cell Network Research Center Sungkyunkwan, University School of Medicine, 16419, Suwon, Korea
| | - Dong-Gyu Jo
- Department of Health Science and Technology, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, 06351, Seoul, Korea.,School of Pharmacy, Sungkyunkwan University, 16419, Suwon, Korea
| | - Kye Won Park
- Department of Food Science and Biotechnology, Sungkyunkwan University, 16419, Suwon, Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, 05505, Seoul, Korea
| | - Jihoe Kim
- Department of Medical Biotechnology, Yeungnam University, 38541, Gyeongsan, Republic of Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, University School of Medicine, 16419, Suwon, Korea. .,Single Cell Network Research Center Sungkyunkwan, University School of Medicine, 16419, Suwon, Korea. .,Department of Health Science and Technology, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, 06351, Seoul, Korea. .,Samsung Biomedical Research Institute, Samsung Medical Center, 06351, Seoul, Korea.
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Abstract
ErbB3-binding protein 1 (EBP1) is a multifunctional protein associated with neural development. Loss of Ebp1 leads to upregulation of the gene silencing unit suppressor of variegation 3-9 homolog 1 (Suv39H1)/DNA (cytosine 5)-methyltransferase (DNMT1). EBP1 directly binds to the promoter region of DNMT1, repressing DNA methylation, and hence, promoting neural development. In the current study, we showed that EBP1 suppresses histone methyltransferase activity of Suv39H1 by promoting ubiquitin-proteasome system (UPS)-dependent degradation of Suv39H1. In addition, we showed that EBP1 directly interacts with Suv39H1, and this interaction is required for recruiting the E3 ligase MDM2 for Suv39H1 degradation. Thus, our findings suggest that EBP1 regulates UPS-dependent degradation of Suv39H1 to govern proper heterochromatin assembly during neural development.
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Affiliation(s)
- Byeong-Seong Kim
- Department of Molecular Cell Biology, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Inwoo Hwang
- Department of Molecular Cell Biology, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, Seoul 05505, Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Suwon 16419, Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
- Samsung Biomedical Research Institute, Samsung Medical Center, Seoul 06351, Korea
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Jin EJ, Ko HR, Lee SB, Kim CK, Yun T, Cho SW, Park KW, Ahn JY. SIAH 1, an E3 ligase facilitates ubiquitination and proteasomal degradation of Akt3 in neuron. IBRO Rep 2019. [DOI: 10.1016/j.ibror.2019.07.1467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Ko HR, Hwang I, Jin EJ, Yun T, Ryu D, Kang JS, Shin JH, Ahn JY. ErbB3 binding protein 1 (EBP1) is an essential regulator for embryonic development, controlling SUV39H1/DNMT1 gene-silencing unit. IBRO Rep 2019. [DOI: 10.1016/j.ibror.2019.07.1055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Ko HR, Jin EJ, Lee SB, Kim CK, Yun T, Cho SW, Park KW, Ahn JY. SIAH1 ubiquitin ligase mediates ubiquitination and degradation of Akt3 in neural development. J Biol Chem 2019; 294:15435-15445. [PMID: 31471318 DOI: 10.1074/jbc.ra119.009618] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 05/31/2019] [Revised: 08/19/2019] [Indexed: 01/17/2023] Open
Abstract
Akt signaling is an important regulator of neural development, but the distinctive function of Akt isoforms in brain development presents a challenge. Here we show Siah1 as an ubiquitin ligase that preferentially interacts with Akt3 and facilitates ubiquitination and degradation of Akt3. Akt3 is enriched in the axonal shaft and branches but not growth cone tips, where Siah1 is prominently present. Depletion of Siah1 enhanced Akt3 levels in the soma and axonal tips, eliciting multiple branching. Brain-specific somatic mutation in Akt3-E17K escapes from Siah1-mediated degradation and causes improper neural development with dysmorphic neurons. Remarkably, coexpression of Siah1 with Akt3-WT restricted disorganization of neural development is caused by Akt3 overexpression, whereas forced expression of Siah1 with the Akt3-E17K mutant fails to cope with malformation of neural development. These findings demonstrate that Siah1 limits Akt3 turnover during brain development and that this event is essential for normal organization of the neural network.
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Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Eun-Ju Jin
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Sang Bae Lee
- Institute for Cancer Genetics, Columbia University Medical Center, New York, New York 10032
| | - Chung Kwon Kim
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Taegwan Yun
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, Seoul 05505, Korea
| | - Kye Won Park
- Department of Food Science and Biotechnology, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 16419, Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea .,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea.,Samsung Biomedical Research Institute, Samsung Medical Center, Seoul 06351, Korea
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Yun T, Ko HR, Ahn J, Jin EJ, Jo JM, Kwon IS, Cho SW, Chang YS, Park WS, Ahn JY. B23/Nucleophosmin promotes reconstitution of synaptic path in hippocampus after injury. Biochem Biophys Res Commun 2019; 508:1082-1087. [PMID: 30553452 DOI: 10.1016/j.bbrc.2018.12.036] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 12/03/2018] [Accepted: 12/05/2018] [Indexed: 10/27/2022]
Abstract
B23, also known as nucleophosmin (NPM), is multifunctional protein directly implicated in cell proliferation, cell cycle progression, and cell survival. In the current study, in addition to confirming its anti-apoptotic function in neuronal survival, we demonstrated that the spatial-temporal expression profile of B23 during development of hippocampal neurons is high in the embryonic stage, down-regulated after birth, and preferentially localized at the tips of growing neuritis and branching points. Overexpression of B23 promotes axon growth with abundant branching points in growing hippocampal neurons, but depletion of B23 impairs axon growth, leading to neuronal death. Following injury to the trisynaptic path in hippocampal slice, overexpression of B23 remarkably increased the number and length of regenerative fibers in the mossy fiber path. Our study suggests that B23 expression in developing neurons is essential for neuritogenesis and axon growth and that up-regulation of B23 may be a strategy for enhancing the reconstitution of synaptic paths after injury to hippocampal synapses.
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Affiliation(s)
- Taegwan Yun
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea; Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea; Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Jaeyoung Ahn
- Department of Medicine, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Eun-Ju Jin
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea; Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Jung Min Jo
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Il-Sun Kwon
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, Seoul, 05505, South Korea
| | - Yun Sil Chang
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, and Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, South Korea; Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, 06351, South Korea
| | - Won Soon Park
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, and Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, South Korea; Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, 06351, South Korea.
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea; Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea; Samsung Biomedical Research Institute, Samsung Medical Center, Seoul, 06351, South Korea.
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Ko HR, Ahn SY, Chang YS, Hwang I, Yun T, Sung DK, Sung SI, Park WS, Ahn JY. Human UCB-MSCs treatment upon intraventricular hemorrhage contributes to attenuate hippocampal neuron loss and circuit damage through BDNF-CREB signaling. Stem Cell Res Ther 2018; 9:326. [PMID: 30463591 PMCID: PMC6249960 DOI: 10.1186/s13287-018-1052-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [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: 06/04/2018] [Revised: 10/02/2018] [Accepted: 10/17/2018] [Indexed: 12/15/2022] Open
Abstract
Background Human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) have been shown to prevent brain damage and improve neurocognition following intraventricular hemorrhage (IVH). However, the molecular mechanisms underlying the effects of hUCB-MSCs are still elusive. Thus, as the hippocampus is essential for learning, memory, and cognitive functions and is intimately involved in the ventricular system, making it a potential site of IVH-induced injury, we determined the molecular basis of the effects of hUCB-derived MSCs on hippocampal neurogenesis and the recovery of hippocampal neural circuits after IVH in a rodent model. Methods We inflicted severe IVH injury on postnatal day 4 (P4) in rats. After confirmation of successful induction of IVH using MRI (P5), intracerebroventricular administration of MSCs (ICV-MSC) was performed at 2 days post-injury (P6). For hippocampal synaptic determination, a rat entorhinal-hippocampus (EH) organotypic slice co-culture (OSC) was performed using day 3 post-IVH brains (P7) with or without ICV-MSCs. A similar strategy of experiments was applied to those rats receiving hUCB-MSC transfected with BDNF-Si-RNA for knockdown of BDNF or scrambled siRNA controls after IVH. The molecular mechanism of the MSCs effects on neurogenesis and the attenuation of neuron death was determined by evaluation of BDNF-TrkB-Akt-CREB signaling axis. Results We showed that treatment with hUCB-MSCs attenuated neuronal loss and promoted neurogenesis in the hippocampus, an area highly vulnerable to IVH-induced brain injury. hUCB-MSCs activate BDNF-TrkB receptor signaling, eliciting intracellular activation of Akt and/or Erk and subsequent phosphorylation of CREB, which is responsible for promoting rat BDNF transcription. In addition to the beneficial effects of neuroprotection and neurogenesis, hUCB-MSCs also contribute to the restoration of impaired synaptic circuits in the hippocampus and improve neurocognitive functions in IVH-injured neonatal rat through BDNF-TrkB-CREB signaling axis activation. Conclusions Our data suggest that hUCB-MSCs possess therapeutic potential for treating neuronal loss and neurocognitive dysfunction in IVH through the activation of intracellular TrkB-CREB signaling that is invoked by hUCB-MSC-secreted BDNF. Electronic supplementary material The online version of this article (10.1186/s13287-018-1052-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, South Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - So Yoon Ahn
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwonro, Gangnam-gu, Seoul, 06351, South Korea.,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.,Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul, 06351, South Korea
| | - Yun Sil Chang
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwonro, Gangnam-gu, Seoul, 06351, South Korea.,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.,Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul, 06351, South Korea
| | - Inwoo Hwang
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, South Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Taegwan Yun
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, South Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea
| | - Dong Kyung Sung
- Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul, 06351, South Korea
| | - Se In Sung
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwonro, Gangnam-gu, Seoul, 06351, South Korea.,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea
| | - Won Soon Park
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwonro, Gangnam-gu, Seoul, 06351, South Korea. .,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea. .,Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul, 06351, South Korea.
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, South Korea. .,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, South Korea. .,Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwonro, Gangnam-gu, Seoul, 06351, South Korea. .,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea. .,Samsung Biomedical Research Institute, Samsung Medical Center, Seoul, 06351, South Korea.
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11
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Jin EJ, Ko HR, Hwang I, Kim BS, Choi JY, Park KW, Cho SW, Ahn JY. Akt regulates neurite growth by phosphorylation-dependent inhibition of radixin proteasomal degradation. Sci Rep 2018; 8:2557. [PMID: 29416050 PMCID: PMC5803261 DOI: 10.1038/s41598-018-20755-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 01/23/2018] [Indexed: 12/20/2022] Open
Abstract
Neurite growth is controlled by a complex molecular signaling network that regulates filamentous actin (F-actin) dynamics at the growth cone. The evolutionarily conserved ezrin, radixin, and moesin family of proteins tether F-actin to the cell membrane when phosphorylated at a conserved threonine residue and modulate neurite outgrowth. Here we show that Akt binds to and phosphorylates a threonine 573 residue on radixin. Akt-mediated phosphorylation protects radixin from ubiquitin-dependent proteasomal degradation, thereby enhancing radixin protein stability, which permits proper neurite outgrowth and growth cone formation. Conversely, the inhibition of Akt kinase or disruption of Akt-dependent phosphorylation reduces the binding affinity of radixin to F-actin as well as lowers radixin protein levels, resulting in decreased neurite outgrowth and growth cone formation. Our findings suggest that Akt signaling regulates neurite outgrowth by stabilizing radixin interactions with F-actin, thus facilitating local F-actin dynamics.
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Affiliation(s)
- Eun-Ju Jin
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea
| | - Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea
| | - Inwoo Hwang
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea
| | - Byeong-Seong Kim
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea
| | - Jeong-Yun Choi
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea
| | - Kye Won Park
- Department of Food Science and Biotechnology, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, 16419, Korea
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan College of Medicine, Seoul, 05505, Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea. .,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Korea. .,Samsung Medical Center, Seoul, 06351, Korea.
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Ko HR, Hwang I, Ahn SY, Chang YS, Park WS, Ahn JY. Neuron-specific expression of p48 Ebp1 during murine brain development and its contribution to CNS axon regeneration. BMB Rep 2017; 50:126-131. [PMID: 27916024 PMCID: PMC5422024 DOI: 10.5483/bmbrep.2017.50.3.190] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Indexed: 01/06/2023] Open
Abstract
P48 Ebp1 is expressed in rapidly proliferating cells such as cancer cells and accelerates cell growth and survival. However, its expression pattern and role in central nervous system development have not been studied. Here, we demonstrated the spatiotemporal expression pattern of p48 Ebp1 during embryonic development and the postnatal period. During embryonic development, p48 Ebp1 was highly expressed in the brain. Expression gradually decreased after birth but was still more abundant than p42 expression after birth. Strikingly, we found that p48 Ebp1 was expressed in a cell type specific manner in neurons but not astrocytes. Moreover, p48 Ebp1 physically interacted with beta tubulin but not alpha tubulin. This fits with its accumulation in distal microtubule growth cone regions. Furthermore, in injured hippocampal slices, p48 Ebp1 introduction promoted axon regeneration. Thus, we speculate that p48 Ebp1 might contribute to microtubule dynamics acting as an MAP and promotes CNS axon regeneration. [BMB Reports 2017; 50(3): 126-131].
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Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - Inwoo Hwang
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| | - So Yoon Ahn
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351; Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul 06351, Korea
| | - Yun Sil Chang
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351; Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul 06351; Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 06351, Korea
| | - Won Soon Park
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351; Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul 06351; Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 06351, Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 16419; Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 06351, Korea
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13
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Ko HR, Kwon IS, Hwang I, Jin EJ, Shin JH, Brennan-Minnella AM, Swanson R, Cho SW, Lee KH, Ahn JY. Akt1-Inhibitor of DNA binding2 is essential for growth cone formation and axon growth and promotes central nervous system axon regeneration. eLife 2016; 5. [PMID: 27938661 PMCID: PMC5153247 DOI: 10.7554/elife.20799] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [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: 08/20/2016] [Accepted: 11/28/2016] [Indexed: 02/02/2023] Open
Abstract
Mechanistic studies of axon growth during development are beneficial to the search for neuron-intrinsic regulators of axon regeneration. Here, we discovered that, in the developing neuron from rat, Akt signaling regulates axon growth and growth cone formation through phosphorylation of serine 14 (S14) on Inhibitor of DNA binding 2 (Id2). This enhances Id2 protein stability by means of escape from proteasomal degradation, and steers its localization to the growth cone, where Id2 interacts with radixin that is critical for growth cone formation. Knockdown of Id2, or abrogation of Id2 phosphorylation at S14, greatly impairs axon growth and the architecture of growth cone. Intriguingly, reinstatement of Akt/Id2 signaling after injury in mouse hippocampal slices redeemed growth promoting ability, leading to obvious axon regeneration. Our results suggest that Akt/Id2 signaling is a key module for growth cone formation and axon growth, and its augmentation plays a potential role in CNS axonal regeneration. DOI:http://dx.doi.org/10.7554/eLife.20799.001
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Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Il-Sun Kwon
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Inwoo Hwang
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Eun-Ju Jin
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Joo-Ho Shin
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Angela M Brennan-Minnella
- The Department of Neurology, University of California, San Francisco Medical Center, San Francisco, United States
| | - Raymond Swanson
- The Department of Neurology, University of California, San Francisco Medical Center, San Francisco, United States
| | - Sung-Woo Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, Seoul, Republic of Korea
| | - Kyung-Hoon Lee
- Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Department of Anatomy, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.,Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
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Ko HR, Chang YS, Park WS, Ahn JY. Opposing roles of the two isoforms of ErbB3 binding protein 1 in human cancer cells. Int J Cancer 2016; 139:1202-8. [DOI: 10.1002/ijc.30165] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 04/25/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine; Suwon Korea
| | - Yun Sil Chang
- Department of Pediatrics; Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
| | - Won Soon Park
- Department of Pediatrics; Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine; Suwon Korea
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15
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Abstract
Although the short isoform of ErbB3-binding protein 1 (Ebp1), p42 has been considered to be a potent tumor suppressor in a number of human cancers, whether p42 suppresses tumorigenesis of lung cancer cells has never been clarified. In the current study we investigated the tumor suppressor role of p42 in non-small cell lung cancer cells. Our data suggest that the expression level of p42 is inversely correlated with the cancerous properties of NSCLC cells and that ectopic expression of p42 is sufficient to inhibit cell proliferation, anchorage-independent growth, and invasion as well as tumor growth in vivo. Interestingly, p42 suppresses Akt activation and overexpression of a constitutively active form of Akt restores the tumorigenic activity of A549 cells that is ablated by exogenous p42 expression. Thus, we propose that p42 Ebp1 functions as a potent tumor suppressor of NSCLC through interruption of Akt signaling. [BMB Reports 2015; 48(3): 159-165]
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Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
| | - Truong Lx Nguyen
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
| | - Chung Kwon Kim
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
| | - Youngbin Park
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Kyung-Hoon Lee
- Anatomy; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
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16
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Ko HR, Kim CK, Ahn JY. Phosphorylation of the N-terminal domain of p48 Ebp1 by CDK2 is required for tumorigenic function of p48. Mol Carcinog 2014; 54:1283-91. [DOI: 10.1002/mc.22203] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 06/07/2014] [Accepted: 06/11/2014] [Indexed: 01/08/2023]
Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology; Center for Molecular Medicine; Samsung Biomedical Research Institute; Sungkyunkwan University School of Medicine; Suwon Korea
| | - Chung Kwon Kim
- Department of Molecular Cell Biology; Center for Molecular Medicine; Samsung Biomedical Research Institute; Sungkyunkwan University School of Medicine; Suwon Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology; Center for Molecular Medicine; Samsung Biomedical Research Institute; Sungkyunkwan University School of Medicine; Suwon Korea
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Ko HR, Kim CK, Lee SB, Song J, Lee KH, Kim KK, Park KW, Cho SW, Ahn JY. P42 Ebp1 regulates the proteasomal degradation of the p85 regulatory subunit of PI3K by recruiting a chaperone-E3 ligase complex HSP70/CHIP. Cell Death Dis 2014; 5:e1131. [PMID: 24651434 PMCID: PMC3973206 DOI: 10.1038/cddis.2014.79] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 01/29/2014] [Accepted: 01/30/2014] [Indexed: 01/28/2023]
Abstract
The short isoform of ErbB3-binding protein 1 (Ebp1), p42, is considered to be a potent tumor suppressor in a number of human cancers, although the mechanism by which it exerts this tumor-suppressive activity is unclear. Here, we report that p42 interacts with the cSH2 domain of the p85 subunit of phosphathidyl inositol 3-kinase (PI3K), leading to inhibition of its lipid kinase activity. Importantly, we found that p42 induces protein degradation of the p85 subunit and further identified HSP70/CHIP complex as a novel E3 ligase for p85 that is responsible for p85 ubiquitination and degradation. In this process, p42 couples p85 to the HSP70/CHIP-mediated ubiquitin–proteasomal system (UPS), thereby promoting a reduction of p85 levels both in vitro and in vivo. Thus, the tumor-suppressing effects of p42 in cancer cells are driven by negative regulation of the p85 subunit of PI3K.
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Affiliation(s)
- H R Ko
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - C K Kim
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - S B Lee
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - J Song
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, Korea
| | - K-H Lee
- Department of Anatomy, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - K K Kim
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - K W Park
- Department of Food Science and Biotechnology, Sungkyunkwan University, Suwon, Korea
| | - S-W Cho
- Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine, Seoul, Korea
| | - J-Y Ahn
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
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18
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Abstract
We performed a screening program to identify telomerase inhibitors from our drug source obtained from fungus fermentations, and found that two compounds, CRM646-A and thielavin B, inhibited telomerase activity at doses of 3.2 and 32 microM, respectively. These compounds also inhibited the activity of viral reverse transcriptase at almost the same dose levels which inhibited telomerase activity.
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Affiliation(s)
- K Togashi
- Antibiotics Laboratory, RIKEN, Saitama, Japan
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Ko HR, Kim BY, Oh WK, Kang DO, Lee HS, Koshino H, Osada H, Mheen TI, Ahn JS. CRM646-A and -B, novel fungal metabolites that inhibit heparinase. J Antibiot (Tokyo) 2000; 53:211-4. [PMID: 10805586 DOI: 10.7164/antibiotics.53.211] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kim BY, Kim JH, Han YJ, Ahn SC, Kang DO, Oh WK, Ko HR, Lee HS, Mheen TI, Ahn JS. pp60v-src reactivation inhibits serum-induced accumulation of inositol phosphates and phosphatidylethanol in tsNRK. IUBMB Life 1999; 48:85-9. [PMID: 10791920 DOI: 10.1080/713803467] [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] [Indexed: 10/23/2022]
Abstract
In tsRSV-infected NRK (tsNRK) cells, pp60(v-src) reactivation by temperature-shift from a nonpermissive temperature, 39 C, to a permissive one, 32 degrees C, induced the production of inositol phosphates (IPt) and phosphatidylethanol (PEt). This was accompanied by an increase in membrane-associated protein kinase C (PKC) activity in the absence of exogenous growth factors. However, with serum-stimulation, the amounts of IPt and PEt at 32 degrees C were less than those at 39 degrees C. Pretreatment with PKC inhibitors, Ro-31-8220 and staurosporine, enhanced the accumulation of IPt but not of PEt at 32 degrees C. The tyrosine phosphorylation of phospholipase Cgamma1 (PLCgamma1) was increased either by serum or by pp60(v-src) reactivation. These results suggest that serum transduces its signal through PLCgamma1 mediation, and that pp60(v-src), possibly through the PKC mediation, negatively affects serum-induced PLCgamma1 activation.
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Affiliation(s)
- B Y Kim
- Korea Research Institute of Bioscience and Biotechnology, Yusong, Taejon
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Lee HS, Ko HR, Ryu SY, Oh WK, Kim BY, Ahn SC, Mheen TI, Ahn JS. Inhibition of phospholipase C gamma 1 by the prenylated flavonoids from Sophora flavescens. Planta Med 1997; 63:266-268. [PMID: 9225612 DOI: 10.1055/s-2006-957670] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The effect on the phospholipase C gamma 1 activity of eleven prenylated flavonoids from Sophora flavescens was investigated. These flavonoids exhibited relatively strong inhibitory activity with IC50 values ranged from 7.5 x 10(-6) M to 35 x 10(-5) M with the exception of kushenol H (4) (IC50 value; > 5.3 x 10(-4) M). The presence of C3-OH resulted in a significant diminution of activity and the configuration of C3-OH is likely to be another factor influencing the activity. In addition, hydration of the C-4"'-C-5"' double bond of the lavandulyl side chain caused complete loss of activity. These data suggest that the presence and configuration of C3-OH are related to the inhibitory activity and the lavandulyl side chain is also important for high inhibitory activity against PLC gamma 1.
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Kim BY, Ahn SC, Kang DO, Ko HR, Oh WK, Lee HS, Mheen TI, Rho HM, Ahn JS. Inhibition of PDGF-induced phospholipase C activation by herbimycin A. Biochim Biophys Acta 1996; 1311:33-6. [PMID: 8603100 DOI: 10.1016/0167-4889(95)00185-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Herbimycin A, an inhibitor of protein tyrosine kinases, dose-dependently reduced PDGF-induced inositol phosphates (IPt) accumulation without effect on phosphatidylethanol (PEt) formation in PLC-gamma 1-overexpressing NIH 3T3 (NIH 3T3 gamma 1) cells. The compound also reduced tyrosine phosphorylations of some proteins including PLC-gamma 1 in response to PDGF. On the other hand, phorbol 12-myristate 13-acetate (PMA)-induced phospholipase D (PLD) activation was reduced by herbimycin A in the cells, indicating that the pathways for PLD activation by PDGF and PMA are different from each other. Also, these results suggest that PLC-gamma 1 activation is not always an upstream event for PLD activation and that tyrosine phosphorylation of one or more proteins not affected by herbimycin A should be indispensable for PLD activation in PDGF-stimulated NIH 3T3 gamma 1 cells.
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Affiliation(s)
- B Y Kim
- Korea Research Institute of Bioscience and Biotechnology (KRIBB), Yuseong, Taejon, South Korea
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