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Qiao Y, Qiao L, Zhao P, Zhang P, Wu F, Zhang J, Gao L, Liu B, Zhang L. Phosphoprotein Detection in Sweat Realized by Intercalation Structure 2D@3D g-C 3N 4@Fe 3O 4 Wearable Sensitive Motif. BIOSENSORS 2022; 12:bios12060361. [PMID: 35735509 PMCID: PMC9220892 DOI: 10.3390/bios12060361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 05/19/2022] [Accepted: 05/20/2022] [Indexed: 05/03/2023]
Abstract
Abnormal protein phosphorylation in sweat metabolites is closely related to cancer, cardiovascular disease, and other diseases. The real-time monitoring of phosphoproteins in sweat is significant for early monitoring of disease biomarkers. Here, a high-efficiency electrochemical sensor for phosphoprotein in sweat was realized by 2D@3D g-C3N4@Fe3O4 with intercalation structure. Common phosphoprotein β-Casein was selected to demonstrate the platform's functionalities. The detection limit of g-C3N4@Fe3O4 could be as low as 9.7 μM, and the detection range was from 0.01 mg/mL to 1 mg/mL. In addition, the sensing platform showed good selectivity, reproducibility, and stability. We also investigated the effects of interface structure on adsorption properties and electronic properties of the g-C3N4 and Fe3O4 heterostructure using DFT. More electrons from Fe3O4 were transferred to g-C3N4, which increased the electrons in the energy band of N atoms and promoted the formation of stable N-H bonds with H atoms in phosphoproteins. We demonstrated phosphoprotein sensor functionality by measuring the phosphoprotein in human sweat during exercising. This work realizes a sensing platform for noninvasive and continuous detection of sweat phosphoproteins in wearable devices.
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Affiliation(s)
- Yuting Qiao
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
| | - Lijuan Qiao
- Research Center of Basic Medical Science, Medical College, Qinghai University, Xining 810016, China
- Correspondence: (L.Q.); (L.G.); (B.L.); Fax: +86-97-1531-0440 (B.L.)
| | - Peize Zhao
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
| | - Peng Zhang
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
| | - Fanbin Wu
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
| | - Jiahui Zhang
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
| | - Li Gao
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
- Correspondence: (L.Q.); (L.G.); (B.L.); Fax: +86-97-1531-0440 (B.L.)
| | - Bingxin Liu
- School of Mechanical Engineering, Qinghai University, Xining 810016, China; (Y.Q.); (P.Z.); (P.Z.); (F.W.); (J.Z.)
- Correspondence: (L.Q.); (L.G.); (B.L.); Fax: +86-97-1531-0440 (B.L.)
| | - Lei Zhang
- Department of Mechanical Engineering, University of Alaska Fairbanks, P.O. Box 755905, Fairbanks, AK 99775-5905, USA;
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Berczeli O, Szarka D, Elekes G, Vizvári E, Szalay L, Almássy J, Tálosi L, Ding C, Tóth-Molnár E. The regulatory role of vasoactive intestinal peptide in lacrimal gland ductal fluid secretion: A new piece of the puzzle in tear production. Mol Vis 2020; 26:780-788. [PMID: 33311973 PMCID: PMC7722779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 12/04/2020] [Indexed: 11/13/2022] Open
Abstract
Purpose Vasoactive intestinal peptide (VIP) is an important regulator of lacrimal gland (LG) function although the effect of VIP on ductal fluid secretion is unknown. Therefore, the aim of the present study was to investigate the role of VIP in the regulation of fluid secretion of isolated LG ducts and to analyze the underlying intracellular mechanisms. Methods LGs from wild-type (WT) and cystic fibrosis transmembrane conductance regulator (CFTR) knockout (KO) mice were used. Immunofluorescence was applied to confirm the presence of VIP receptors termed VPAC1 and VPAC2 in LG duct cells. Ductal fluid secretion evoked by VIP (100 nM) was measured in isolated ducts using videomicroscopy. Intracellular Ca2+ signaling underlying VIP stimulation was investigated with microfluorometry. Results VIP stimulation resulted in a robust and continuous fluid secretory response in isolated duct segments originated from WT mice. In contrast, CFTR KO ducts exhibited only a weak pulse-like secretion. A small but statistically significant increase was detected in the intracellular Ca2+ level [Ca2+]i during VIP stimulation in the WT and in CFTR KO ducts. VIP-evoked changes in [Ca2+]i did not differ considerably between the WT and CFTR KO ducts. Conclusions These results suggest the importance of VIP in the regulation of ductal fluid secretion and the determining role of the adenylyl cyclase-cAMP-CFTR route in this process.
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Affiliation(s)
- Orsolya Berczeli
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - Dóra Szarka
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - Gréta Elekes
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - Eszter Vizvári
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - László Szalay
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - János Almássy
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - László Tálosi
- Department of Pharmacognosy, University of Szeged, Szeged, Hungary
| | - Chuanqing Ding
- Department of Pharmacology & Pharmaceutical Sciences, Ophthalmology, University of Southern California, Los Angeles, CA
| | - Edit Tóth-Molnár
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
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Tóth-Molnár E, Ding C. New insight into lacrimal gland function: Role of the duct epithelium in tear secretion. Ocul Surf 2020; 18:595-603. [DOI: 10.1016/j.jtos.2020.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/21/2020] [Accepted: 07/07/2020] [Indexed: 02/08/2023]
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Shamsuddin AKM, Quinton PM. Concurrent absorption and secretion of airway surface liquids and bicarbonate secretion in human bronchioles. Am J Physiol Lung Cell Mol Physiol 2019; 316:L953-L960. [PMID: 30838869 PMCID: PMC6589593 DOI: 10.1152/ajplung.00545.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 03/01/2019] [Accepted: 03/01/2019] [Indexed: 01/15/2023] Open
Abstract
Although small airways account for the largest fraction of the total conducting airway surfaces, the epithelial fluid and electrolyte transport in small, native airway epithelia has not been well characterized. Investigations have been limited, no doubt, by the complex tissue architecture as well as by its inaccessibility, small dimensions, and lack of applicable assays, especially in human tissues. To better understand how the critically thin layer of airway surface liquid (ASL) is maintained, we applied a "capillary"-Ussing chamber (area ≈1 mm2) to measure ion transport properties of bronchioles with diameters of ~2 mm isolated from resected specimens of excised human lungs. We found that the small human airway, constitutively and concurrently, secretes and absorbs fluid as observed in porcine small airways (50). We found that the human bronchiolar epithelium is also highly anion selective and constitutively secretes bicarbonate ( HCO 3 - ), which can be enhanced pharmacologically by cAMP as well as Ca2+-mediated agonists. Concurrent secretion and absorption of surface liquid along with HCO 3 - secretion help explain how the delicate volume of the fluid lining the human small airway is physiologically buffered and maintained in a steady state that avoids desiccating or flooding the small airway with ASL.
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Affiliation(s)
- A K M Shamsuddin
- Department of Pediatrics, University of California , San Diego, California
| | - Paul M Quinton
- Department of Pediatrics, University of California , San Diego, California
- Division of Biomedical Sciences, University of California , Riverside, California
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Hołyńska-Iwan I, Bogusiewicz J, Chajdas D, Szewczyk-Golec K, Lampka M, Olszewska-Słonina D. The immediate influence of deltamethrin on ion transport through rabbit skin. An in vitro study. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018; 148:144-150. [PMID: 29891365 DOI: 10.1016/j.pestbp.2018.04.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 03/09/2018] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
Deltamethrin can be absorbed into the respiratory tract, the gastrointestinal tract and through the skin. The study was designed to assess the effect of deltamethrin on electrophysiological parameters of rabbit's skin, studied in vitro, to identify the mechanism of action and effects of short-term dermal exposure to deltamethrin. The objective of the study was to investigate changes in electrophysiological parameters after exposure to 0.01 M deltamethrin under unchanged conditions, in the presence of amiloride (sodium transport blocker) and bumetanide (chloride transport blocker). Exposure to deltamethrin reduced the electrophysiological reaction of examined tissue in unchanged conditions and during the sodium reabsorption phase but did not influence the chloride ion secretion phase. The presented data show that the pyrethroide affects transepithelial ion transport in the external layers of the skin. The inhibition of chloride and sodium ions enabled evaluation of the impact of the pesticide on dermal transport.
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Affiliation(s)
- Iga Hołyńska-Iwan
- Laboratory of Electrophysiology of Epithelial Tissue and Skin, Department of Pathobiochemistry and Clinical Chemistry, Faculty of Pharmacy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Torun, Poland.
| | - Joanna Bogusiewicz
- Department of Pharmacodynamics and Molecular Pharmacology, Faculty of Pharmacy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Toruń, Poland
| | - Dagmara Chajdas
- Student of Medical Analytics, Faculty of Pharmacy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Torun, Poland
| | - Karolina Szewczyk-Golec
- Chair of Medical Biology, Faculty of Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Torun, Poland.
| | - Magdalena Lampka
- Department of Pathobiochemistry and Clinical Chemistry, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Torun, Poland.
| | - Dorota Olszewska-Słonina
- Department of Pathobiochemistry and Clinical Chemistry, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Torun, Poland.
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Saint-Criq V, Gray MA. Role of CFTR in epithelial physiology. Cell Mol Life Sci 2016; 74:93-115. [PMID: 27714410 PMCID: PMC5209439 DOI: 10.1007/s00018-016-2391-y] [Citation(s) in RCA: 239] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 09/28/2016] [Indexed: 12/20/2022]
Abstract
Salt and fluid absorption and secretion are two processes that are fundamental to epithelial function and whole body fluid homeostasis, and as such are tightly regulated in epithelial tissues. The CFTR anion channel plays a major role in regulating both secretion and absorption in a diverse range of epithelial tissues, including the airways, the GI and reproductive tracts, sweat and salivary glands. It is not surprising then that defects in CFTR function are linked to disease, including life-threatening secretory diarrhoeas, such as cholera, as well as the inherited disease, cystic fibrosis (CF), one of the most common life-limiting genetic diseases in Caucasian populations. More recently, CFTR dysfunction has also been implicated in the pathogenesis of acute pancreatitis, chronic obstructive pulmonary disease (COPD), and the hyper-responsiveness in asthma, underscoring its fundamental role in whole body health and disease. CFTR regulates many mechanisms in epithelial physiology, such as maintaining epithelial surface hydration and regulating luminal pH. Indeed, recent studies have identified luminal pH as an important arbiter of epithelial barrier function and innate defence, particularly in the airways and GI tract. In this chapter, we will illustrate the different operational roles of CFTR in epithelial function by describing its characteristics in three different tissues: the airways, the pancreas, and the sweat gland.
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Affiliation(s)
- Vinciane Saint-Criq
- Epithelial Research Group, Institute for Cell and Molecular Biosciences, University Medical School, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH UK
| | - Michael A. Gray
- Epithelial Research Group, Institute for Cell and Molecular Biosciences, University Medical School, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH UK
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Vijftigschild LAW, Berkers G, Dekkers JF, Zomer-van Ommen DD, Matthes E, Kruisselbrink E, Vonk A, Hensen CE, Heida-Michel S, Geerdink M, Janssens HM, van de Graaf EA, Bronsveld I, de Winter-de Groot KM, Majoor CJ, Heijerman HGM, de Jonge HR, Hanrahan JW, van der Ent CK, Beekman JM. β2-Adrenergic receptor agonists activate CFTR in intestinal organoids and subjects with cystic fibrosis. Eur Respir J 2016; 48:768-79. [PMID: 27471203 DOI: 10.1183/13993003.01661-2015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 05/11/2016] [Indexed: 01/12/2023]
Abstract
We hypothesized that people with cystic fibrosis (CF) who express CFTR (cystic fibrosis transmembrane conductance regulator) gene mutations associated with residual function may benefit from G-protein coupled receptor (GPCR)-targeting drugs that can activate and enhance CFTR function.We used intestinal organoids to screen a GPCR-modulating compound library and identified β2-adrenergic receptor agonists as the most potent inducers of CFTR function.β2-Agonist-induced organoid swelling correlated with the CFTR genotype, and could be induced in homozygous CFTR-F508del organoids and highly differentiated primary CF airway epithelial cells after rescue of CFTR trafficking by small molecules. The in vivo response to treatment with an oral or inhaled β2-agonist (salbutamol) in CF patients with residual CFTR function was evaluated in a pilot study. 10 subjects with a R117H or A455E mutation were included and showed changes in the nasal potential difference measurement after treatment with oral salbutamol, including a significant improvement of the baseline potential difference of the nasal mucosa (+6.35 mV, p<0.05), suggesting that this treatment might be effective in vivo Furthermore, plasma that was collected after oral salbutamol treatment induced CFTR activation when administered ex vivo to organoids.This proof-of-concept study suggests that organoids can be used to identify drugs that activate CFTR function in vivo and to select route of administration.
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Affiliation(s)
- Lodewijk A W Vijftigschild
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands Laboratory of Translational Immunology, University Medical Center, Utrecht, The Netherlands These two authors contributed equally to this work
| | - Gitte Berkers
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands These two authors contributed equally to this work
| | - Johanna F Dekkers
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands Laboratory of Translational Immunology, University Medical Center, Utrecht, The Netherlands These two authors contributed equally to this work
| | - Domenique D Zomer-van Ommen
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands Laboratory of Translational Immunology, University Medical Center, Utrecht, The Netherlands These two authors contributed equally to this work
| | - Elizabeth Matthes
- CF Translational Research Centre, Dept of Physiology, McGill University, Montréal, QC, Canada
| | - Evelien Kruisselbrink
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands Laboratory of Translational Immunology, University Medical Center, Utrecht, The Netherlands
| | - Annelotte Vonk
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands Laboratory of Translational Immunology, University Medical Center, Utrecht, The Netherlands
| | - Chantal E Hensen
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands
| | - Sabine Heida-Michel
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands
| | - Margot Geerdink
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands
| | - Hettie M Janssens
- Dept of Pediatric Pulmonology, Erasmus Medical Center/Sophia Children's Hospital, Rotterdam, The Netherlands
| | | | - Inez Bronsveld
- Dept of Pulmonology, University Medical Center, Utrecht, The Netherlands
| | | | - Christof J Majoor
- Dept of Respiratory Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | - Harry G M Heijerman
- Dept of Pulmonology and Cystic Fibrosis, Haga Teaching Hospital, The Hague, The Netherlands
| | - Hugo R de Jonge
- Dept of Gastroenterology and Hepatology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - John W Hanrahan
- CF Translational Research Centre, Dept of Physiology, McGill University, Montréal, QC, Canada
| | | | - Jeffrey M Beekman
- Dept of Pediatric Pulmonology, University Medical Center, Utrecht, The Netherlands Regenerative Medicine Center Utrecht, University Medical Center, Utrecht, The Netherlands
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Cui CY, Schlessinger D. Eccrine sweat gland development and sweat secretion. Exp Dermatol 2015; 24:644-50. [PMID: 26014472 DOI: 10.1111/exd.12773] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2015] [Indexed: 12/21/2022]
Abstract
Eccrine sweat glands help to maintain homoeostasis, primarily by stabilizing body temperature. Derived from embryonic ectoderm, millions of eccrine glands are distributed across human skin and secrete litres of sweat per day. Their easy accessibility has facilitated the start of analyses of their development and function. Mouse genetic models find sweat gland development regulated sequentially by Wnt, Eda and Shh pathways, although precise subpathways and additional regulators require further elucidation. Mature glands have two secretory cell types, clear and dark cells, whose comparative development and functional interactions remain largely unknown. Clear cells have long been known as the major secretory cells, but recent studies suggest that dark cells are also indispensable for sweat secretion. Dark cell-specific Foxa1 expression was shown to regulate a Ca(2+) -dependent Best2 anion channel that is the candidate driver for the required ion currents. Overall, it was shown that cholinergic impulses trigger sweat secretion in mature glands through second messengers - for example InsP3 and Ca(2+) - and downstream ion channels/transporters in the framework of a Na(+) -K(+) -Cl(-) cotransporter model. Notably, the microenvironment surrounding secretory cells, including acid-base balance, was implicated to be important for proper sweat secretion, which requires further clarification. Furthermore, multiple ion channels have been shown to be expressed in clear and dark cells, but the degree to which various ion channels function redundantly or indispensably also remains to be determined.
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Affiliation(s)
- Chang-Yi Cui
- Laboratory of Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - David Schlessinger
- Laboratory of Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
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Murota H, Matsui S, Ono E, Kijima A, Kikuta J, Ishii M, Katayama I. Sweat, the driving force behind normal skin: an emerging perspective on functional biology and regulatory mechanisms. J Dermatol Sci 2014; 77:3-10. [PMID: 25266651 DOI: 10.1016/j.jdermsci.2014.08.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 08/22/2014] [Accepted: 08/27/2014] [Indexed: 11/19/2022]
Abstract
The various symptoms associated with excessive or insufficient perspiration can significantly reduce a patient's quality of life. If a versatile and minimally invasive method could be established for returning sweat activity to normalcy, there is no question that it could be used in the treatment of many diseases that are believed to involve perspiration. For this reason, based on an understanding of the sweat-gland control function and sweat activity, it was necessary to conduct a comprehensive search for the factors that control sweating, such as the central and peripheral nerves that control sweat-gland function, the microenvironment surrounding the sweat glands, and lifestyle. We focused on the mechanism by which atopic dermatitis leads to hypohidrosis and confirmed that histamine inhibits acetylcholinergic sweating. Acetylcholine promotes the phosphorylation of glycogen synthesis kinase 3β (GSK3β) in the sweat-gland secretory cells and leads to sensible perspiration. By suppressing the phosphorylation of GSK3β, histamine inhibits the movement of sweat from the sweat-gland secretory cells through the sweat ducts, which could presumably be demonstrated by dynamic observations of the sweat glands using two-photon microscopy. It is expected that the discovery of new factors that control sweat-gland function can contribute to the treatment of diseases associated with dyshidrosis.
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Affiliation(s)
- Hiroyuki Murota
- Department of Dermatology, Course of Integrated Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan.
| | - Saki Matsui
- Department of Dermatology, Course of Integrated Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan
| | - Emi Ono
- Department of Dermatology, Course of Integrated Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan
| | - Akiko Kijima
- Department of Dermatology, Course of Integrated Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan
| | - Junichi Kikuta
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Bioscience, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan
| | - Masaru Ishii
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Bioscience, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan
| | - Ichiro Katayama
- Department of Dermatology, Course of Integrated Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, Japan
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De La Vega-Beltran JL, Sánchez-Cárdenas C, Krapf D, Hernandez-González EO, Wertheimer E, Treviño CL, Visconti PE, Darszon A. Mouse sperm membrane potential hyperpolarization is necessary and sufficient to prepare sperm for the acrosome reaction. J Biol Chem 2012; 287:44384-93. [PMID: 23095755 DOI: 10.1074/jbc.m112.393488] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Mammalian sperm are unable to fertilize the egg immediately after ejaculation; they acquire this capacity during migration in the female reproductive tract. This maturational process is called capacitation and in mouse sperm it involves a plasma membrane reorganization, extensive changes in the state of protein phosphorylation, increases in intracellular pH (pH(i)) and Ca(2+) ([Ca(2+)](i)), and the appearance of hyperactivated motility. In addition, mouse sperm capacitation is associated with the hyperpolarization of the cell membrane potential. However, the functional role of this process is not known. In this work, to dissect the role of this membrane potential change, hyperpolarization was induced in noncapacitated sperm using either the ENaC inhibitor amiloride, the CFTR agonist genistein or the K(+) ionophore valinomycin. In this experimental setting, other capacitation-associated processes such as activation of a cAMP-dependent pathway and the consequent increase in protein tyrosine phosphorylation were not observed. However, hyperpolarization was sufficient to prepare sperm for the acrosome reaction induced either by depolarization with high K(+) or by addition of solubilized zona pellucida (sZP). Moreover, K(+) and sZP were also able to increase [Ca(2+)](i) in non-capacitated sperm treated with these hyperpolarizing agents but not in untreated cells. On the other hand, in conditions that support capacitation-associated processes blocking hyperpolarization by adding valinomycin and increasing K(+) concentrations inhibited the agonist-induced acrosome reaction as well as the increase in [Ca(2+)](i). Altogether, these results suggest that sperm hyperpolarization by itself is key to enabling mice sperm to undergo the acrosome reaction.
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Affiliation(s)
- Jose Luis De La Vega-Beltran
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62210, México
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Abstract
PURPOSE We investigated the role that the cystic fibrosis transmembrane conductance regulator (CFTR) may play in Cl(-) transport in the acinar and ductal epithelial cells of rabbit lacrimal gland (LG). METHODS Primary cultured LG acinar cells were processed for whole-cell patch-clamp electrophysiological recording of Cl(-) currents by using perfusion media with high and low [Cl(-)], 10 µM forskolin and 100 µM 3-isobutyl-1-methylxanthine (IBMX), the non-specific Cl(-) channel blocker 4,4'-disothiocyanostilbene-2, 2' sulphonic acid (DIDS; 100 µM) and CFTRinh-172 (10 µM), a specific blocker for CFTR. Ex vivo live cell imaging of [Cl(-)] changes in duct cells was performed on freshly dissected LG duct with a multiphoton confocal laser scanning microscope using a Cl(-) sensitive fluorescence dye, N-[ethoxycarbonylmethyl]-6-methoxy-quinolinium bromide. RESULTS Whole-cell patch-clamp studies demonstrated the presence of Cl(-) current in isolated acinar cells and revealed that this Cl(-) current was mediated by CFTR channel. Live cell imaging also showed the presence of CFTR-mediated Cl(-) transport across the plasma membrane of duct cells. CONCLUSIONS Our previous data showed the presence of CFTR in all acinar and duct cells within the rabbit LG, with expression most prominent in the apical membranes of duct cells. The present study demonstrates that CFTR is actively involved in Cl(-) transport in both acinar cells and epithelial cells from duct segments, suggesting that CFTR may play a significant role in LG secretion.
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Affiliation(s)
- Michael Lu
- Department of Cell and Neurobiology, Doheny Eye Institute, University of Southern California, Los Angeles, CA, USA
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Chuanqing Ding
- Department of Cell and Neurobiology, Doheny Eye Institute, University of Southern California, Los Angeles, CA, USA
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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