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Imaizumi Y. Reciprocal Relationship between Ca 2+ Signaling and Ca 2+-Gated Ion Channels as a Potential Target for Drug Discovery. Biol Pharm Bull 2022; 45:1-18. [PMID: 34980771 DOI: 10.1248/bpb.b21-00896] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cellular Ca2+ signaling functions as one of the most common second messengers of various signal transduction pathways in cells and mediates a number of physiological roles in a cell-type dependent manner. Ca2+ signaling also regulates more general and fundamental cellular activities, including cell proliferation and apoptosis. Among ion channels, Ca2+-permeable channels in the plasma membrane as well as endo- and sarcoplasmic reticulum membranes play important roles in Ca2+ signaling by directly contributing to the influx of Ca2+ from extracellular spaces or its release from storage sites, respectively. Furthermore, Ca2+-gated ion channels in the plasma membrane often crosstalk reciprocally with Ca2+ signals and are central to the regulation of cellular functions. This review focuses on the physiological and pharmacological impact of i) Ca2+-gated ion channels as an apparatus for the conversion of cellular Ca2+ signals to intercellularly propagative electrical signals and ii) the opposite feedback regulation of Ca2+ signaling by Ca2+-gated ion channel activities in excitable and non-excitable cells.
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Affiliation(s)
- Yuji Imaizumi
- Department of Molecular and Cellular Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University
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2
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Kito H, Morihiro H, Sakakibara Y, Endo K, Kajikuri J, Suzuki T, Ohya S. Downregulation of the Ca 2+-activated K + channel K Ca3.1 in mouse preosteoblast cells treated with vitamin D receptor agonist. Am J Physiol Cell Physiol 2020; 319:C345-C358. [PMID: 32520608 DOI: 10.1152/ajpcell.00587.2019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The maturity of osteoblasts by proliferation and differentiation in preosteoblasts is essential for maintaining bone homeostasis. The beneficial effects of vitamin D on bone homeostasis in mammals have been demonstrated experimentally and clinically. However, the direct actions of vitamin D on preosteoblasts remain to be fully elucidated. In this study, we found that the functional activity of intermediate-conductance Ca2+-activated K+ channels (KCa3.1) positively regulated cell proliferation in MC3T3-E1 cells derived from mouse preosteoblasts by enhancing intracellular Ca2+ signaling. We examined the effects of treatment with vitamin D receptor (VDR) agonist on the expression and activity of KCa3.1 by real-time PCR examination, Western blotting, Ca2+ imaging, and patch clamp analyses in mouse MC3T3-E1 cells. Following the downregulation of KCa3.1 transcriptional modulators such as Fra-1 and HDAC2, KCa3.1 activity was suppressed in MC3T3-E1 cells treated with VDR agonists. Furthermore, application of the KCa3.1 activator DCEBIO attenuated the VDR agonist-evoked suppression of cell proliferation rate. These findings suggest that a decrease in KCa3.1 activity is involved in the suppression of cell proliferation rate in VDR agonist-treated preosteoblasts. Therefore, KCa3.1 plays an important role in bone formation by promoting osteoblastic proliferation under physiological conditions.
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Affiliation(s)
- Hiroaki Kito
- Department of Pharmacology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Haruka Morihiro
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Yuka Sakakibara
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Kyoko Endo
- Department of Pharmacology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Junko Kajikuri
- Department of Pharmacology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Takayoshi Suzuki
- Department of Complex Molecular Chemistry, The Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan
| | - Susumu Ohya
- Department of Pharmacology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
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3
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Chiang EY, Li T, Jeet S, Peng I, Zhang J, Lee WP, DeVoss J, Caplazi P, Chen J, Warming S, Hackos DH, Mukund S, Koth CM, Grogan JL. Potassium channels Kv1.3 and KCa3.1 cooperatively and compensatorily regulate antigen-specific memory T cell functions. Nat Commun 2017; 8:14644. [PMID: 28248292 PMCID: PMC5337993 DOI: 10.1038/ncomms14644] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 01/18/2017] [Indexed: 01/01/2023] Open
Abstract
Voltage-gated Kv1.3 and Ca2+-dependent KCa3.1 are the most prevalent K+ channels expressed by human and rat T cells. Despite the preferential upregulation of Kv1.3 over KCa3.1 on autoantigen-experienced effector memory T cells, whether Kv1.3 is required for their induction and function is unclear. Here we show, using Kv1.3-deficient rats, that Kv1.3 is involved in the development of chronically activated antigen-specific T cells. Several immune responses are normal in Kv1.3 knockout (KO) rats, suggesting that KCa3.1 can compensate for the absence of Kv1.3 under these specific settings. However, experiments with Kv1.3 KO rats and Kv1.3 siRNA knockdown or channel-specific inhibition of human T cells show that maximal T-cell responses against autoantigen or repeated tetanus toxoid stimulations require both Kv1.3 and KCa3.1. Finally, our data also suggest that T-cell dependency on Kv1.3 or KCa3.1 might be irreversibly modulated by antigen exposure.
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Affiliation(s)
- Eugene Y Chiang
- Department of Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Tianbo Li
- Department of Biochemical and Cellular Pharmacology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Surinder Jeet
- Department of Translational Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Ivan Peng
- Department of Translational Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Juan Zhang
- Department of Translational Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Wyne P Lee
- Department of Translational Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Jason DeVoss
- Department of Translational Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Patrick Caplazi
- Department of Pathology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Jun Chen
- Department of Biochemical and Cellular Pharmacology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Søren Warming
- Department of Molecular Biology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - David H Hackos
- Department of Neurobiology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Susmith Mukund
- Department of Structural Biology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Christopher M Koth
- Department of Structural Biology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Jane L Grogan
- Department of Immunology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA
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Nakakura S, Matsui M, Sato A, Ishii M, Endo K, Muragishi S, Murase M, Kito H, Niguma H, Kurokawa N, Fujii M, Araki M, Araki K, Ohya S. Pathophysiological significance of the two-pore domain K(+) channel K2P5.1 in splenic CD4(+)CD25(-) T cell subset from a chemically-induced murine inflammatory bowel disease model. Front Physiol 2015; 6:299. [PMID: 26578971 PMCID: PMC4621418 DOI: 10.3389/fphys.2015.00299] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 10/09/2015] [Indexed: 01/17/2023] Open
Abstract
The alkaline pH-activated, two-pore domain K(+) channel K2P5.1 (also known as TASK2/KCNK5) plays an important role in maintaining the resting membrane potential, and contributes to the control of Ca(2+) signaling in several types of cells. Recent studies highlighted the potential role of the K2P5.1 K(+) channel in the pathogenesis of autoimmune diseases such as rheumatoid arthritis and multiple sclerosis. The aim of the present study was to elucidate the pathological significance of the K2P5.1 K(+) channel in inflammatory bowel disease (IBD). The degrees of colitis, colonic epithelial damage, and colonic inflammation were quantified in the dextran sulfate sodium-induced mouse IBD model by macroscopic and histological scoring systems. The expression and functional activity of K2P5.1 in splenic CD4(+) T cells were measured using real-time PCR, Western blot, and fluorescence imaging assays. A significant increase was observed in the expression of K2P5.1 in the splenic CD4(+) T cells of the IBD model. Concomitant with this increase, the hyperpolarization response induced by extracellular alkaline pH was significantly larger in the IBD model with the corresponding intracellular Ca(2+) rises. The expression of K2P5.1 was higher in CD4(+)CD25(-) T cells than in CD4(+)CD25(+) regulatory T cells. The knockout of K2P5.1 in mice significantly suppressed the disease responses implicated in the IBD model. Alternations in intracellular Ca(2+) signaling following the dysregulated expression of K2P5.1 were associated with the disease pathogenesis of IBD. The results of the present study suggest that the K2P5.1 K(+) channel in CD4(+)CD25(-) T cell subset is a potential therapeutic target and biomarker for IBD.
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Affiliation(s)
- Sawa Nakakura
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Miki Matsui
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Aya Sato
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Mizuki Ishii
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Kyoko Endo
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Sayaka Muragishi
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Miki Murase
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Hiroaki Kito
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Hiroki Niguma
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Natsumi Kurokawa
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Masanori Fujii
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
| | - Masatake Araki
- Institute of Resource Development and Analysis, Kumamoto University Kumamoto, Japan
| | - Kimi Araki
- Institute of Resource Development and Analysis, Kumamoto University Kumamoto, Japan
| | - Susumu Ohya
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University Kyoto, Japan
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5
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Endo K, Kurokawa N, Kito H, Nakakura S, Fujii M, Ohya S. Molecular identification of the dominant-negative, splicing isoform of the two-pore domain K(+) channel K(2P)5.1 in lymphoid cells and enhancement of its expression by splicing inhibition. Biochem Pharmacol 2015; 98:440-52. [PMID: 26475531 DOI: 10.1016/j.bcp.2015.10.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 10/01/2015] [Indexed: 12/20/2022]
Abstract
The two-pore domain background K(+) channel K2P5.1 is expected as a possible therapeutic target for autoimmune and inflammatory disorders and cancers because it plays an important role in maintaining the resting membrane potential and regulation of Ca(2+) signaling in T lymphocytes and cancer cells. However, the lack of selective K2P5.1 blockers has led to difficulties conducting experimental studies on this K(+) channel. We identified a novel splicing isoform of K2P5.1, K2P5.1B from the mammalian spleen, which lacked the N-terminus of full-length K2P5.1A. A co-immunoprecipitation assay using mice spleen lysates revealed an interaction between K2P5.1A and K2P5.1B in the cytoplasmic C-terminal domain. In a heterologous HEK293 expression system, K2P5.1B inhibited the trafficking of K2P5.1A to the plasma membrane. The alkaline pHe-induced hyperpolarizing response was significantly suppressed in K2P5.1B-transfected human leukemia K562 cells. Enhancement in cell proliferation by the overexpression of K2P5.1A in K562 was significantly prevented by the transfection of K2P5.1B. The spliceosome inhibitor pladienolide B significantly enhanced the relative expression of K2P5.1B in K562, resulting in decreases in the activity of K2P5.1A. K2P5.1B suppresses the function of the K2P5.1 K(+) channel in a dominant-negative manner, suggesting that the mRNA splicing mechanisms underlying the transcriptional regulation of K2P5.1B may be a new therapeutic strategy for autoimmune and inflammatory disorders and cancers.
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Affiliation(s)
- Kyoko Endo
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
| | - Natsumi Kurokawa
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
| | - Hiroaki Kito
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
| | - Sawa Nakakura
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
| | - Masanori Fujii
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
| | - Susumu Ohya
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
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Wang LP, Luo J, Hu HF, Zhang L, Li YL, Ai LM, Wang YL, Ma YT, Mu HY, Hou YM. The expression and functional evidence for voltage-dependent potassium channel Kv1.3 in lymphocytes during aging in spontaneously hypertensive rats. Int J Clin Exp Med 2015; 8:2506-2515. [PMID: 25932196 PMCID: PMC4402843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 01/29/2015] [Indexed: 06/04/2023]
Abstract
AIMS Our previous studies showed that expression and functional profile of voltage-dependent potassium channels Kv1.3 were increased in lymphocytes of spontaneously hypertensive rats (SHR) compared to normotensive rats, suggesting a crucial role for lymphocyte Kv1.3 in the development of hypertension. Here, we further investigated whether the expression and functional profile of Kv1.3 was related to increased blood pressure in SHR with age of 4, 8, 16 and 24 wk. METHODS Systolic blood pressure was measured through pressure device around the tail. mRNA and protein expression were assessed by real-time PCR and western blot in lymphocytes of SHR. Current density of Kv channels in lymphocytes was measured by patch-clamp. RESULTS Systolic blood pressure was elevated in an age-dependent manner (ANOVA P < 0.05). mRNA and protein level of Kv1.3 were significantly increased in an age-dependent manner in lymphocyte of SHR (ANOVA P < 0.05). Moreover, the current density of Kv was dramatically enhanced in an age-dependent manner (ANOVA P < 0.05). CONCLUSION The systolic blood pressure positively correlated with expression as well as current density of potassium channels in lymphocytes of SHR at age of 8, 16 and 24 wk. In conclusion, Kv1.3 channels were upregulated in an age-dependent manner in SHR and correlates with systolic blood pressure during aging. The present study implies that Kv1.3 blockers may be applied as a therapeutic treatment for the development of hypertension during aging.
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Affiliation(s)
- Ling-Peng Wang
- Department of Cardiology of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Jian Luo
- Department of Internal Medicine (VIP) of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Hai-Feng Hu
- Department of Heart and Renal of The Sixth People’s Hospital in Xinjiang Uygur Autonomous RegionUrumqi 830000, Xinjiang, China
| | - Li Zhang
- Department of Internal Medicine (VIP) of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Ya-Li Li
- Department of Internal Medicine (VIP) of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Li-Man Ai
- Department of Cardiology of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Yu-Ling Wang
- Department of Internal Medicine (VIP) of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Yi-Tong Ma
- Department of Cardiology of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Hu-Yati Mu
- Department of Cardiology of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
| | - Yue-Mei Hou
- Department of Cardiology of The First Affiliated Hospital, Xinjiang Medical UniversityUrumqi 830000, Xinjiang, China
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Matsuba S, Niwa S, Muraki K, Kanatsuka S, Nakazono Y, Hatano N, Fujii M, Zhan P, Suzuki T, Ohya S. Downregulation of Ca2+-activated Cl- channel TMEM16A by the inhibition of histone deacetylase in TMEM16A-expressing cancer cells. J Pharmacol Exp Ther 2014; 351:510-8. [PMID: 25232193 DOI: 10.1124/jpet.114.217315] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The Ca(2+)-activated Cl(-) channel transmembrane proteins with unknown function 16 A (TMEM16A; also known as anoctamin 1 or discovered on gastrointestinal stromal tumor 1) plays an important role in facilitating the cell growth and metastasis of TMEM16A-expressing cancer cells. Histone deacetylase (HDAC) inhibitors (HDACi) are useful agents for cancer therapy, but it remains unclear whether ion channels are epigenetically regulated by them. Using real-time polymerase chain reaction, Western blot analysis, and whole-cell patch-clamp assays, we found a significant decrease in TMEM16A expression and its functional activity was induced by the vorinostat, a pan-HDACi in TMEM16A-expressing human cancer cell lines, the prostatic cancer cell line PC-3, and the breast cancer cell line YMB-1. TMEM16A downregulation was not induced by the chemotherapy drug paclitaxel in either cell type. Pharmacologic blockade of HDAC3 by 1 μM T247 [N-(2-aminophenyl)-4-[1-(2-thiophen-3-ylethyl)-1H-[1],[2],[3]triazol-4-yl]benzamide], a HDAC3-selective HDACi, elicited a large decrease in TMEM16A expression and functional activity in both cell types, and pharmacologic blockade of HDAC2 by AATB [4-(acetylamino)-N-[2-amino-5-(2-thienyl)phenyl]-benzamide; 300 nM] elicited partial inhibition of TMEM16A expression (∼40%) in both. Pharmacologic blockade of HDAC1 or HDAC6 did not elicit any significant change in TMEM16A expression, respectively. In addition, inhibition of HDAC3 induced by small interfering RNA elicited a large decrease in TMEM16A transcripts in both cell types. Taken together, in malignancies with a frequent gene amplification of TMEM16A, HDAC3 inhibition may exert suppressive effects on cancer cell viability via downregulation of TMEM16A.
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Affiliation(s)
- Sayo Matsuba
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Satomi Niwa
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Katsuhiko Muraki
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Saki Kanatsuka
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Yurika Nakazono
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Noriyuki Hatano
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Masanori Fujii
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Peng Zhan
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Takayoshi Suzuki
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
| | - Susumu Ohya
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan (S.M., S.N., S.K., Y.N., M.F., S.O.); Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya, Japan (K.M., N.H.); and Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (P.Z., T.S.)
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8
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Ohya S, Fukuyo Y, Kito H, Shibaoka R, Matsui M, Niguma H, Maeda Y, Yamamura H, Fujii M, Kimura K, Imaizumi Y. Upregulation of KCa3.1 K(+) channel in mesenteric lymph node CD4(+) T lymphocytes from a mouse model of dextran sodium sulfate-induced inflammatory bowel disease. Am J Physiol Gastrointest Liver Physiol 2014; 306:G873-85. [PMID: 24674776 DOI: 10.1152/ajpgi.00156.2013] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The intermediate-conductance Ca(2+)-activated K(+) channel KCa3.1/KCNN4 plays an important role in the modulation of Ca(2+) signaling through the control of the membrane potential in T lymphocytes. Here, we study the involvement of KCa3.1 in the enlargement of the mesenteric lymph nodes (MLNs) in a mouse model of inflammatory bowel disease (IBD). The mouse model of IBD was prepared by exposing male C57BL/6J mice to 5% dextran sulfate sodium for 7 days. Inflammation-induced changes in KCa3.1 activity and the expressions of KCa3.1 and its regulators in MLN CD4(+) T lymphocytes were monitored by real-time PCR, Western blot, voltage-sensitive dye imaging, patch-clamp, and flow cytometric analyses. Concomitant with an upregulation of KCa3.1a and nucleoside diphosphate kinase B (NDPK-B), a positive KCa3.1 regulator, an increase in KCa3.1 activity was observed in MLN CD4(+) T lymphocytes in the IBD model. Pharmacological blockade of KCa3.1 elicited the following results: 1) a significant decrease in IBD disease severity, as assessed by diarrhea, visible fecal blood, inflammation, and crypt damage of the colon and MLN enlargement compared with control mice, and 2) the restoration of the expression levels of KCa3.1a, NDPK-B, and Th1 cytokines in IBD model MLN CD4(+) T lymphocytes. These findings suggest that the increase in KCa3.1 activity induced by the upregulation of KCa3.1a and NDPK-B may be involved in the pathogenesis of IBD by mediating the enhancement of the proliferative response in MLN CD4(+) T lymphocyte and, therefore, that the pharmacological blockade of KCa3.1 may decrease the risk of IBD.
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Affiliation(s)
- Susumu Ohya
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan; Department of Molecular & Cellular Pharmacology, Nagoya City University, Nagoya, Japan;
| | - Yuka Fukuyo
- Department of Molecular & Cellular Pharmacology, Nagoya City University, Nagoya, Japan
| | - Hiroaki Kito
- Department of Molecular & Cellular Pharmacology, Nagoya City University, Nagoya, Japan
| | - Rina Shibaoka
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Miki Matsui
- Department of Molecular & Cellular Pharmacology, Nagoya City University, Nagoya, Japan
| | - Hiroki Niguma
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Yasuhiro Maeda
- Department of Hospital Pharmacy, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan; and
| | - Hisao Yamamura
- Department of Molecular & Cellular Pharmacology, Nagoya City University, Nagoya, Japan
| | - Masanori Fujii
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Kazunori Kimura
- Department of Hospital Pharmacy, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan; and Department of Clinical Pharmacy, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Yuji Imaizumi
- Department of Molecular & Cellular Pharmacology, Nagoya City University, Nagoya, Japan
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