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Takeuchi T, Harada Y, Moriyama S, Furuta K, Tanaka S, Miyaji T, Omote H, Moriyama Y, Hiasa M. Vesicular Polyamine Transporter Mediates Vesicular Storage and Release of Polyamine from Mast Cells. J Biol Chem 2017; 292:3909-3918. [PMID: 28082679 DOI: 10.1074/jbc.m116.756197] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 01/04/2017] [Indexed: 01/12/2023] Open
Abstract
Mast cells are secretory cells that play an important role in host defense by discharging various intragranular contents, such as histamine and serotonin, upon stimulation of Fc receptors. The granules also contain spermine and spermidine, which can act as modulators of mast cell function, although the mechanism underlying vesicular storage remains unknown. Vesicular polyamine transporter (VPAT), the fourth member of the SLC18 transporter family, is an active transporter responsible for vesicular storage of spermine and spermidine in neurons. In the present study, we investigated whether VPAT functions in mast cells. RT-PCR and Western blotting indicated VPAT expression in murine bone marrow-derived mast cells (BMMCs). Immunohistochemical analysis indicated that VPAT is colocalized with VAMP3 but not with histamine, serotonin, cathepsin D, VAMP2, or VAMP7. Membrane vesicles from BMMCs accumulated spermidine upon the addition of ATP in a reserpine- and bafilomycin A1-sensitive manner. BMMCs secreted spermine and spermidine upon the addition of either antigen or A23187 in the presence of Ca2+, and the antigen-mediated release, which was shown to be temperature-dependent and sensitive to bafilomycin A1 and tetanus toxin, was significantly suppressed by VPAT gene RNA interference. Under these conditions, expression of vesicular monoamine transporter 2 was unaffected, but antigen-dependent histamine release was significantly suppressed, which was recovered by the addition of 1 mm spermine. These results strongly suggest that VPAT is expressed and is responsible for vesicular storage of spermine and spermidine in novel secretory granules that differ from histamine- and serotonin-containing granules and is involved in vesicular release of these polyamines from mast cells.
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Affiliation(s)
- Tomoya Takeuchi
- From the Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530
| | - Yuika Harada
- From the Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530
| | - Satomi Moriyama
- From the Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530
| | - Kazuyuki Furuta
- the Department of Immunobiology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8530, and
| | - Satoshi Tanaka
- the Department of Immunobiology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8530, and
| | - Takaaki Miyaji
- the Advanced Science Research Center, Okayama University, Okayama 700-8530, Japan
| | - Hiroshi Omote
- From the Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530
| | - Yoshinori Moriyama
- From the Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530,
| | - Miki Hiasa
- From the Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530,
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Pi J, Bai Y, Reece JM, Williams J, Liu D, Freeman ML, Fahl WE, Shugar D, Liu J, Qu W, Collins S, Waalkes MP. Molecular mechanism of human Nrf2 activation and degradation: role of sequential phosphorylation by protein kinase CK2. Free Radic Biol Med 2007; 42:1797-806. [PMID: 17512459 PMCID: PMC1950666 DOI: 10.1016/j.freeradbiomed.2007.03.001] [Citation(s) in RCA: 164] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2006] [Revised: 01/25/2007] [Accepted: 03/02/2007] [Indexed: 12/15/2022]
Abstract
Nrf2 is a key transcription factor in the cellular response to oxidative stress. In this study we identify two phosphorylated forms of endogenous human Nrf2 after chemically induced oxidative stress and provide evidence that protein kinase CK2-mediated sequential phosphorylation plays potential roles in Nrf2 activation and degradation. Human Nrf2 has a predicted molecular mass of 66 kDa. However, immunoblots showed that two bands at 98 and 118 kDa, which are identified as phosphorylated forms, are increased in response to Nrf2 inducers. In addition, human Nrf2 was found to be a substrate for CK2 which mediated two steps of phosphorylation, resulting in two forms of Nrf2 migrating with differing M(r) at 98 kDa (Nrf2-98) and 118 kDa (Nrf2-118). Our results support a role in which calmodulin binding regulates CK2 activity, in that cold (25 degrees C) Ca(2+)-free media (cold/Ca(2+)-free) decreased both cellular calcium levels and CK2-calmodulin binding and induced Nrf2-118 formation, the latter of which was prevented by CK2-specific inhibitors. Gel shift assays showed that the Nrf2-118 generated under cold/Ca(2+)-free conditions does not bind to the antioxidant response element, indicating that Nrf2-98 has transcriptional activity. In contrast, Nrf2-118 is more susceptible to degradation. These results provide evidence for phosphorylation by CK2 as a critical controlling factor in Nrf2-mediated cellular antioxidant response.
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Affiliation(s)
- Jingbo Pi
- Laboratory of Comparative Carcinogenesis, NCI at NIEHS, NIH, RTP, North Carolina 27709
- Endocrine Biology Program, The Hamner Institutes for Health Sciences, RTP, North Carolina 27709
| | - Yushi Bai
- Endocrine Biology Program, The Hamner Institutes for Health Sciences, RTP, North Carolina 27709
| | - Jeffrey M. Reece
- Laboratory of Signal Transduction, NIEHS, NIH, RTP, North Carolina 27709
| | - Jason Williams
- Laboratory of Structure Biology, NIEHS, NIH, RTP, North Carolina 27709
| | - Dianxin Liu
- Laboratory of Signal Transduction, NIEHS, NIH, RTP, North Carolina 27709
| | - Michael L. Freeman
- Department of Radiation Oncology, Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee 37232
| | - William E. Fahl
- McArdle Laboratory for Cancer Research, University of Wisconsin, Madison, Wisconsin, 53706
| | - David Shugar
- Institute of Biochemistry & Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Jie Liu
- Laboratory of Comparative Carcinogenesis, NCI at NIEHS, NIH, RTP, North Carolina 27709
| | - Wei Qu
- Laboratory of Comparative Carcinogenesis, NCI at NIEHS, NIH, RTP, North Carolina 27709
| | - Sheila Collins
- Endocrine Biology Program, The Hamner Institutes for Health Sciences, RTP, North Carolina 27709
| | - Michael P. Waalkes
- Laboratory of Comparative Carcinogenesis, NCI at NIEHS, NIH, RTP, North Carolina 27709
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