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Dai A, Liu X, Zhang Y, Han L, Zhu L, Ni H, Chen R, Cao M. Up-Regulation of KPNB1 Involves in Neuronal Apoptosis Following Intracerebral Hemorrhage in Adult Rats. Neurochem Res 2015; 40:2177-87. [PMID: 26303509 DOI: 10.1007/s11064-015-1706-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 07/20/2015] [Accepted: 08/19/2015] [Indexed: 01/22/2023]
Abstract
Kpnb1, also known as Importin β1, is a member of the Karyopherin protein family which plays a important role in nuclear import and export pathways. Its expression has been shown to be responsive to stress, such as heat shock, ethanol and oxidative stress. Previous studies demonstrated that Kpnb1 had anti-apoptotic in cervical cancer. These together prompted us to explore whether Kpnb1 has some association with neuron apoptosis in the pathophysiology of intracerebral hemorrhage (ICH). In our study, an ICH model was established by injecting into the right basal ganglia of adult rats with their autologous whole blood and assessed by behavioral tests. We found Kpnb1 were significantly up-regulated adjacent to the hematoma following ICH by Western blot and immunohistochemistry. Double immunofluorenscence manifested Kpnb1 was strikingly increased in neurons, not astrocytes or microglia. Furthermore, we also found that kpnb1 had co-localizations with active-caspase-3 which is a neuronal apoptosis marker suggesting its role in neuronal apoptosis. What's more, our in vitro study, using Kpnb1 RNA interference in PC12 cells, further indicated that Kpnb1 might exert its pro-apoptotic function on neuronal apoptosis. Therefore, Kpnb1 may play a role in the neuronal apoptosis following ICH.
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Affiliation(s)
- Aihua Dai
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Xiaorong Liu
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Yu Zhang
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Lijian Han
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Liang Zhu
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Haidan Ni
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Rongrong Chen
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Maohong Cao
- Department of Neurology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China.
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Ribonuclease like 5 regulates zebrafish yolk extension by suppressing a p53-dependent DNA damage response pathway. Int J Biochem Cell Biol 2015; 65:12-9. [PMID: 25980932 DOI: 10.1016/j.biocel.2015.05.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 04/10/2015] [Accepted: 05/05/2015] [Indexed: 12/15/2022]
Abstract
Ribonuclease like 5 (Rnasel5) is a novel member of the zebrafish ribonuclease A family and its expression is increased during early embryogenesis. However, the in vivo biological function of Rnasel5 remains to be elucidated. Here, we report that knockdown of Rnasel5 by morhpolinos caused shrunken yolk extension as well as increased DNA damage at yolk syncytial layer and external tissue layers via the activation of p53 pathway. In addition, the morphological defects caused by Rnasel5 knockdown can be partially rescued by mRNA injection. Our findings provide the first functional characterization of Rnasel5 in zebrafish development and reveal its critical role in yolk extension by modulation of the p53 pathway.
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Huang KY, Chen GD, Cheng CH, Liao KY, Hung CC, Chang GD, Hwang PP, Lin SY, Tsai MC, Khoo KH, Lee MT, Huang CJ. Phosphorylation of the zebrafish M6Ab at serine 263 contributes to filopodium formation in PC12 cells and neurite outgrowth in zebrafish embryos. PLoS One 2011; 6:e26461. [PMID: 22028883 PMCID: PMC3197635 DOI: 10.1371/journal.pone.0026461] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 09/27/2011] [Indexed: 01/22/2023] Open
Abstract
Background Mammalian M6A, a member of the proteolipid protein (PLP/DM20) family expressed in neurons, was first isolated by expression cloning with a monoclonal antibody. Overexpression of M6A was shown to induce filopodium formation in neuronal cells; however, the underlying mechanism of is largely unknown. Possibly due to gene duplication, there are two M6A paralogs, M6Aa and M6Ab, in the zebrafish genome. In the present study, we used the zebrafish as a model system to investigate the role of zebrafish M6Ab in filopodium formation in PC12 cells and neurite outgrowth in zebrafish embryos. Methodology/Principal Findings We demonstrated that zebrafish M6Ab promoted extensive filopodium formation in NGF-treated PC12 cells, which is similar to the function of mammalian M6A. Phosphorylation at serine 263 of zebrafish M6Ab contributed to this induction. Transfection of the S263A mutant protein greatly reduced filopodium formation in PC12 cells. In zebrafish embryos, only S263D could induce neurite outgrowth. Conclusions/Significance Our results reveal that the phosphorylation status of zebrafish M6Ab at serine 263 is critical for its role in regulating filopodium formation and neurite outgrowth.
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Affiliation(s)
- Kai-Yun Huang
- Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Gen-Der Chen
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | | | - Kuan-Ya Liao
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Chin-Chun Hung
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Geen-Dong Chang
- Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
| | - Pung-Pung Hwang
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Shu-Yu Lin
- Academia Sinica Common Mass Spectrometry Facilities at Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Ming-Chieh Tsai
- National Research Program for Genomic Medicine (NRPGM) Core Facilities for Proteomics and Glycomcis at Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Kay-Hooi Khoo
- Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Ming-Ting Lee
- Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
- * E-mail: (M-TL); (C-JH)
| | - Chang-Jen Huang
- Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
- * E-mail: (M-TL); (C-JH)
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Azmi AS, Philip PA, Beck FWJ, Wang Z, Banerjee S, Wang S, Yang D, Sarkar FH, Mohammad RM. MI-219-zinc combination: a new paradigm in MDM2 inhibitor-based therapy. Oncogene 2010; 30:117-26. [PMID: 20818437 PMCID: PMC3000878 DOI: 10.1038/onc.2010.403] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Zinc plays a crucial role in the biology of p53 in that p53 binds to DNA through a structurally complex domain stabilized by zinc atom. The p53 negative regulator MDM2 protein also carries a C-terminal RING domain that coordinates two zinc atoms which are responsible for p53 nuclear export and proteasomal degradation. In this clinically translatable study, we explored the critical role of zinc on p53 re-activation by MDM2-inhibitor MI-219 in colon and breast cancer cells. ZnCl2 enhanced MI-219 activity (MTT, apoptosis and colony formation), and chelation of zinc not only blocked the activity of MI-219, it also suppressed re-activation of the p53 and its downstream effector molecules p21WAF1 and Bax. TPEN, a specific zinc chelator but not Bapta-AM, a calcium chelator, blocked MI-219-induced apoptosis. Nuclear localization is a pre-requisite for proper functioning of p53 and our results confirm that TPEN and not Bapta-AM could abrogate p53 nuclear localization and interfered with p53 transcriptional activation. Addition of zinc suppressed the known p53 feedback MDM2 activation which could be restored by TPEN. Co-immunoprecipitation studies verified that MI-219-mediated MDM2-p53 disruption could be suppressed by TPEN and restored by zinc. As such, single agent therapies that target MDM2 inhibition, without supplemental zinc, may not be optimal in certain patients due to the less recognized mild zinc deficiency among the “at risk population” as in the elderly which are more prone to cancers. Therefore, use of supplemental zinc with MI-219 will benefit the overall efficacy of MDM2 inhibitors and this potent combination warrants further investigation.
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Affiliation(s)
- A S Azmi
- Department of Pathology, Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
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Chu CY, Cheng CH, Chen GD, Chen YC, Hung CC, Huang KY, Huang CJ. The zebrafish erythropoietin: functional identification and biochemical characterization. FEBS Lett 2007; 581:4265-71. [PMID: 17706649 DOI: 10.1016/j.febslet.2007.07.073] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Revised: 07/20/2007] [Accepted: 07/30/2007] [Indexed: 10/23/2022]
Abstract
In the present study, the zebrafish epo cDNA was cloned. The encoded protein displays 90%, 55% and 32% identity to the Epo from carp, fugu and human, respectively. Through RT-PCR, the expression of zepo mRNA was mainly in the heart and liver. In the COS-1 cell transfection experiments, the recombinant zEpo-HA protein was efficiently secreted into the culture medium as a glycoprotein and the carbohydrate moiety can be cleaved by the treatment of peptide-N-glycosidase F (PNGase F). Using the morpholino approach, we showed that zepo morphants displayed severe anemia leading to high mortality during development. Such an effect can be significantly rescued by zepo RNA. Furthermore, in the absence of functional zEpo, the expression of specific markers for adult globin genes, such as alphaA1- and betaA1-globin, but not the embryonic betae1-globin, was affected.
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Affiliation(s)
- Cheng-Ying Chu
- Graduate Institute of Biochemical Sciences, National Taiwan University, Taipei 106, Taiwan
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