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Sato K, Saito S, Endo K, Kono M, Kakei T, Taketa H, Kato M, Hamamoto S, Grenzi M, Costa A, Munemasa S, Murata Y, Ishimaru Y, Uozumi N. Green Tea Catechins, (-)-Catechin Gallate, and (-)-Gallocatechin Gallate are Potent Inhibitors of ABA-Induced Stomatal Closure. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2201403. [PMID: 35524639 PMCID: PMC9313475 DOI: 10.1002/advs.202201403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/06/2022] [Indexed: 06/04/2023]
Abstract
Stomatal movement is indispensable for plant growth and survival in response to environmental stimuli. Cytosolic Ca2+ elevation plays a crucial role in ABA-induced stomatal closure during drought stress; however, to what extent the Ca2+ movement across the plasma membrane from the apoplast to the cytosol contributes to this process still needs clarification. Here the authors identify (-)-catechin gallate (CG) and (-)-gallocatechin gallate (GCG), components of green tea, as inhibitors of voltage-dependent K+ channels which regulate K+ fluxes in Arabidopsis thaliana guard cells. In Arabidopsis guard cells CG/GCG prevent ABA-induced: i) membrane depolarization; ii) activation of Ca2+ permeable cation (ICa ) channels; and iii) cytosolic Ca2+ transients. In whole Arabidopsis plants co-treatment with CG/GCG and ABA suppressed ABA-induced stomatal closure and surface temperature increase. Similar to ABA, CG/GCG inhibited stomatal closure is elicited by the elicitor peptide, flg22 but has no impact on dark-induced stomatal closure or light- and fusicoccin-induced stomatal opening, suggesting that the inhibitory effect of CG/GCG is associated with Ca2+ -related signaling pathways. This study further supports the crucial role of ICa channels of the plasma membrane in ABA-induced stomatal closure. Moreover, CG and GCG represent a new tool for the study of abiotic or biotic stress-induced signal transduction pathways.
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Affiliation(s)
- Kanane Sato
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Shunya Saito
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Kohsuke Endo
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Masaru Kono
- Department of BiologyGraduate School of ScienceUniversity of TokyoBunkyo‐ku113‐0033Japan
| | - Taishin Kakei
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Haruka Taketa
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Megumi Kato
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Shin Hamamoto
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Matteo Grenzi
- Department of BiosciencesUniversity of MilanVia G. Celoria 26Milan20133Italy
| | - Alex Costa
- Department of BiosciencesUniversity of MilanVia G. Celoria 26Milan20133Italy
- Institute of BiophysicsNational Research Council of Italy (CNR)Via G. Celoria 26Milan20133Italy
| | - Shintaro Munemasa
- Graduate School of Environmental and Life ScienceOkayama UniversityTsushimaOkayama700‐8530Japan
| | - Yoshiyuki Murata
- Graduate School of Environmental and Life ScienceOkayama UniversityTsushimaOkayama700‐8530Japan
| | - Yasuhiro Ishimaru
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
| | - Nobuyuki Uozumi
- Department of Biomolecular EngineeringGraduate School of EngineeringTohoku UniversityAobayama 6‐6‐07Sendai980‐8579Japan
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Montalbetti N, Fischbarg J. Frequency spectrum of transepithelial potential difference reveals transport-related oscillations. Biophys J 2009; 97:1530-7. [PMID: 19751657 PMCID: PMC2741586 DOI: 10.1016/j.bpj.2009.05.063] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Revised: 05/18/2009] [Accepted: 05/28/2009] [Indexed: 11/24/2022] Open
Abstract
How epithelia transport fluid is a fundamental issue that is unresolved. Explanations offered include molecular engines, local transcellular osmosis, local paracellular osmosis, and paracellular fluid transport. On the basis of experimental and theoretical work done on corneal endothelium, a fluid transporting epithelium, we suggest electroosmotic coupling at the level of the intercellular junctions driven by the transendothelial electrical potential difference as an explanation of paracellular fluid transport. We collect frequency spectra of that potential difference in real-time. For what we believe is the first time for any epithelium, we report that, unexpectedly, the potential difference displays oscillations at many characteristic frequencies. We also show that on both stimulating cell activity and inhibiting ion transport mechanisms, there are corresponding changes in the oscillations amplitudes that mirror changes known previously in rates of fluid transport. We believe these findings provide a novel tool to study the kinetics of electrogenic elements such as channels and transporters, which from this evidence would give rise to current oscillations with characteristic periods going from 150 ms to 8 s.
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Affiliation(s)
| | - Jorge Fischbarg
- Institute of Cardiology Research, University of Buenos Aires, and CONICET, Buenos Aires, Argentina
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Drake KD, Schuette D, Chepelinsky AB, Jacob TJC, Crabbe MJC, Jacob TJ. pH-Dependent channel activity of heterologously-expressed main intrinsic protein (MIP) from rat lens. FEBS Lett 2002; 512:199-204. [PMID: 11852079 DOI: 10.1016/s0014-5793(02)02284-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Wild-type rat lens main intrinsic protein (MIP) was heterologously expressed in the membrane of Spodoptera frugiperda (Sf21) cells using the baculovirus expression system and in mouse erythroid leukaemia cells (MEL C88). Both MEL and Sf21 cell lines expressing wild-type MIP were investigated for the conductance of ions using a whole cell patch clamp technique. An increase in conductance was seen in both expression systems, particularly on lowering the pH to 6.3. In Sf21 cells, addition of antibodies to the NPA1 box resulted in a reduction of current flow. These results suggest that MIP has pH-dependent ion channel activity, which involves the NPA1 box domain.
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Affiliation(s)
- K Dawn Drake
- Division of Cell and Molecular Biology, School of Animal and Microbial Sciences, The University of Reading, P.O. Box 228, Whiteknights, Berkshire RG6 6AJ, Reading, UK
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Higuchi A, Adachi S, Imizu T, Ok YB, Tsubomura T, Hara M, Sakai K. Oscillation of Membrane Potential in Immobilized DNA Membranes. J Phys Chem B 2000. [DOI: 10.1021/jp001600n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akon Higuchi
- Department of Industrial Chemistry, Seikei University, 3-1 Kichijoji Kitamachi 3, Musashino, Tokyo 180-8633, Japan
| | - Shinya Adachi
- Department of Industrial Chemistry, Seikei University, 3-1 Kichijoji Kitamachi 3, Musashino, Tokyo 180-8633, Japan
| | - Takeshi Imizu
- Department of Industrial Chemistry, Seikei University, 3-1 Kichijoji Kitamachi 3, Musashino, Tokyo 180-8633, Japan
| | - Yoon Boo Ok
- Department of Industrial Chemistry, Seikei University, 3-1 Kichijoji Kitamachi 3, Musashino, Tokyo 180-8633, Japan
| | - Taro Tsubomura
- Department of Industrial Chemistry, Seikei University, 3-1 Kichijoji Kitamachi 3, Musashino, Tokyo 180-8633, Japan
| | - Mariko Hara
- Department of Industrial Chemistry, Seikei University, 3-1 Kichijoji Kitamachi 3, Musashino, Tokyo 180-8633, Japan
| | - Ken Sakai
- Department of Applied Chemistry, Science University of Tokyo, 1-3 Kagurazaka, Shinjyuku, Tokyo 162-8601, Japan
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Stelling JW, Jacob TJ. Functional coupling in bovine ciliary epithelial cells is modulated by carbachol. THE AMERICAN JOURNAL OF PHYSIOLOGY 1997; 273:C1876-81. [PMID: 9435492 DOI: 10.1152/ajpcell.1997.273.6.c1876] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The functional coupling of the ciliary epithelium was studied in isolated pairs (couplets) of pigmented ciliary epithelial (PCE) and nonpigmented ciliary epithelial (NPCE) cells using the whole cell patch clamp and the fluorescent dye lucifer yellow. One cell of the pair (usually the NPCE cell of a NPCE-PCE cell couplet) was accessed with a 2-5 M omega electrode, containing 1-2 mM lucifer yellow, in the whole cell configuration of the patch clamp. After voltage-clamp experiments were completed, cells were viewed under a fluorescent microscope to confirm that the cells were coupled. The electrical coupling of the cells was also studied by calculating the capacitance (using the time-domain technique), assuming a "supercell" model for coupled cells. The mean capacitance of coupled pairs was 79.8 +/- 4.3 (SE) pF (n = 47) compared with single cell capacitances of 36.8 +/- 3.4 pF (n = 10) for PCE cells and 38.1 +/- 3.1 pF (n = 15) for NPCE cells. Octanol, carbachol (CCh), and raised extracellular Ca2+ concentration ([Ca2+]o) all caused uncoupling in pairs (couplets) of coupled NPCE and PCE cells. At room temperature (22-24 degrees C), the capacitance of the couplets decreased from 70.5 +/- 8.0 to 48.0 +/- 5.2 pF (n = 5) when exposed to octanol (1 mM), from 73.8 +/- 9.2 to 43.2 +/- 9.5 pF (n = 4) when exposed to CCh (100 microM), and from 80.5 +/- 6.7 to 49.9 +/- 7.8 pF (n = 4) when exposed to 10 mM [Ca2+]o. The response to CCh was dose dependent; at higher temperatures of 34-37 degrees C, 10 microM CCh caused a 38% reduction in capacitance, from 53.7 +/- 9.7 to 33.5 +/- 3.3 pF (n = 7) with a half-time of 249 s, and 100 microM CCh caused a 49% reduction in capacitance, from 51.3 +/- 5.6 to 26.0 +/- 2.4 pF (n = 7) with a half-time of 124 s. After pairs uncoupled and the uncoupling agent was washed out, the cell pairs often exhibited an increase in capacitance that we interpreted as "recoupling" or a reopening of the gap junctional communication pathway; the half-time for this process was 729 s after uncoupling with 100 microM CCh and 211 s after uncoupling with 10 microM CCh. This interpretation was confirmed optically by the spread of lucifer yellow into both cells of an uncoupled pair with a time course corresponding to the increase in electrical coupling. The controllable coupling of ciliary epithelial cells extends the idea of a functional syncytium involved in active transport. PCE cells take up solute and water from the blood, which then cross to NPCE cells via gap junctions and from there are secreted into the posterior chamber of the eye. Modulation of the coupling between NPCE and PCE cells may provide a mechanism to control secretion.
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Affiliation(s)
- J W Stelling
- Physiology Unit, University of Wales, Cardiff, United Kingdom
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Fischbarg J. Mechanism of fluid transport across corneal endothelium and other epithelial layers: a possible explanation based on cyclic cell volume regulatory changes. Br J Ophthalmol 1997; 81:85-9. [PMID: 9135416 PMCID: PMC1722009 DOI: 10.1136/bjo.81.1.85] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- J Fischbarg
- Department of Physiology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
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Chapter 1 Transport Components of Net Secretion of the Aqueous Humor and Their Integrated Regulation. CURRENT TOPICS IN MEMBRANES 1997. [DOI: 10.1016/s0070-2161(08)60241-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Chapter 3 Chloride Channels in the Ciliary Epithelium. CURRENT TOPICS IN MEMBRANES 1997. [DOI: 10.1016/s0070-2161(08)60243-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Wu J, Zhang JJ, Koppel H, Jacob TJ. P-glycoprotein regulates a volume-activated chloride current in bovine non-pigmented ciliary epithelial cells. J Physiol 1996; 491 ( Pt 3):743-55. [PMID: 8815208 PMCID: PMC1158815 DOI: 10.1113/jphysiol.1996.sp021254] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
1. The whole-cell patch clamp technique was used to investigate the swelling-activated currents in bovine non-pigmented ciliary epithelial (NPCE) cells. 2. Exposure to hypotonic solution activated a current that was blocked by 5-nitro-2-(3-phenylpropylamino)benzoic acid (NPPB). The I-V relationship was shifted in the direction expected for a Cl- current when the external Cl- was replaced by gluconate (permeability ratio P(gluconate)/PCl = 0.17). The inhibition of the current evoked by voltage clamp steps of +80 mV yielded an IC50 for NPPB of 13.4 microM. 3. The current was found to be dependent on ATP. With ATP in the patch pipette the current could be repeatedly activated by exposure to hypotonic solution but when ATP was omitted the current ran down with time. 4. The development of this current was associated with visible cell swelling and inhibitors of regulatory volume decrease in these cells, e.g. tamoxifen, 4-acetamido-4'-isothiocyanatostilbene-2,2'-disulphonic acid (SITS) and 4,4'-diisothiocyanostilbene-2,2'-disulphonic acid (DIDS), also inhibited this current. 5. The volume-activated current was additionally blocked by NPPB, verapamil, quinidine and dideoxyforskolin. 6. The current was independent of external calcium and exhibited slight outward rectification and time-dependent inactivation at strong depolarizing potentials. 7. Disrupting the cytoskeleton and microtubules with cytochalasin B and colchicine had no effect on the activation of the Cl- current. 8. An antibody (C219) to the MDR1 gene product, P-glycoprotein, caused a functional block of the swelling-activated Cl- current when added to the patch pipette. 9. Immunofluorescence studies using the monoclonal antibodies C219 and JSB-1 demonstrated the presence of P-glycoprotein in the ciliary epithelial cells. The immunofluorescence was stronger on the non-pigmented than on the pigmented cells. 10. It is concluded that swelling in NPCE cells activates a Ca(2+)-independent, ATP-dependent Cl- current and that the activity of this current is associated with P-glycoprotein. 11. It is suggested that this Cl- current contributes to regulatory volume decrease and may participate in the secretory activity of these cells.
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Affiliation(s)
- J Wu
- Eye Research Lab, University of Wales, Cardiff, UK
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Higuchi A, Hara M. Oscillation of Membrane Potential in Chemically Modified Poly(α-amino acid) Membranes. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9516001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akon Higuchi
- Department of Industrial Chemistry, Faculty of Engineering, Seikei University, 3 Kichijoji Kita-machi, Musashino, Tokyo 180, Japan
| | - Mariko Hara
- Department of Industrial Chemistry, Faculty of Engineering, Seikei University, 3 Kichijoji Kita-machi, Musashino, Tokyo 180, Japan
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