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Coptisine, a protoberberine alkaloid, relaxes mouse airway smooth muscle via blockade of VDLCCs and NSCCs. Biosci Rep 2021; 40:222118. [PMID: 32095824 PMCID: PMC7042126 DOI: 10.1042/bsr20190534] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 02/06/2020] [Accepted: 02/12/2020] [Indexed: 12/02/2022] Open
Abstract
Background/Aims: Recently, effective and purified ingredients of traditional Chinese medicine (TCM) were extracted to play crucial roles in the treatment of pulmonary diseases. Our previous research focused on TCM drug screening aimed at abnormal airway muscle contraction during respiratory diseases. Coptisine, an effective ingredient extracted from bitter herbs has shown a series of antioxidant, antibacterial, cardioprotective and neuroprotective pharmacological properties. In the current study, we questioned whether coptisine could also participate in asthma treatment through relaxing abnormal contracted mouse airway smooth muscle (ASM). The present study aimed to characterize the relaxant effects of coptisine on mouse ASM and uncover the underlying molecular mechanisms. Methods: To investigate the role of coptisine on pre-contracted mouse ASM, a series of biological techniques, including force measurement and patch-clamp experiments were employed. Results: Coptisine was found to inhibit high K+ or acetylcholine chloride (ACh)-induced pre-contracted mouse tracheal rings in a dose-dependent manner. Further research demonstrated that the coptisine-induced mouse ASM relaxation was mediated by alteration of calcium mobilization via voltage-dependent L-type Ca2+ channels (VDLCCs) and non-selective cation channels (NSCCs). Conclusion: Our data showed that mouse ASM could be relaxed by coptisine via altering the intracellular Ca2+ concentration through blocking VDLCCs and NSCCs, which suggested that this pharmacological active constituent might be classified as a potential new drug for the treatment of abnormal airway muscle contraction.
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Yang X, Xue L, Zhao Q, Cai C, Liu QH, Shen J. Nelumbo nucifera leaves extracts inhibit mouse airway smooth muscle contraction. Altern Ther Health Med 2017; 17:159. [PMID: 28320373 PMCID: PMC5359798 DOI: 10.1186/s12906-017-1674-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 03/10/2017] [Indexed: 01/06/2023]
Abstract
Background Alkaloids extracted from lotus leaves (AELL) can relax vascular smooth muscle. However, whether AELL has a similar relaxant role on airway smooth muscle (ASM) remains unknown. This study aimed to explore the relaxant property of AELL on ASM and the underlying mechanism. Methods Alkaloids were extracted from dried lotus leaves using the high temperature rotary evaporation extraction method. The effects of AELL on mouse ASM tension were studied using force measuring and patch-clamp techniques. Results It was found that AELL inhibited the high K+ or acetylcholine chloride (ACh)-induced precontraction of mouse tracheal rings by 64.8 ± 2.9%, or 48.8 ± 4.7%, respectively. The inhibition was statistically significant and performed in a dose-dependent manner. Furthermore, AELL-induced smooth muscle relaxation was partially mediated by blocking voltage-dependent Ca2+ channels (VDCC) and non-selective cation channels (NSCC). Conclusion AELL, which plays a relaxant role in ASM, might be a new complementary treatment to treat abnormal contractions of the trachea and asthma. Electronic supplementary material The online version of this article (doi:10.1186/s12906-017-1674-7) contains supplementary material, which is available to authorized users.
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Kaneda T, Sakaguchi R, Shimizu K, Urakawa N, Nakajyo S. Effects of high-K+, Na+-deficient solution on contractility of the smooth muscles of the bovine trachea. J Vet Med Sci 2006; 68:1039-45. [PMID: 17085881 DOI: 10.1292/jvms.68.1039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A high-K+, Na+-deficient (I-154 K+) solution induced contraction followed by gradual relaxation of the smooth muscles of the bovine trachea, while hyperosmotic addition of 65 mM KCl induced a large sustained contraction. Exposure of the muscle to the I-154 K+ solution induced an increase in the ratio of cellular water content and a sustained increase in oxidized flavoprotein fluorescence or reduced pyridine nucleotide fluorescence. The I-154 K+ solution also induced a sustained increase in [Ca2+]i level. Decreases in developed tension and increases in cellular water content were both prevented by the addition of sucrose or NaCl but not pyruvate. Substitution of KI for KCl in the I-154 K+ solution produced a greater inhibition of contraction, while substitution with K-propionate produced no inhibition of contraction. Moreover, decreases in developed tension and increases in cellular water content were both prevented by addition of 100 microM 4,4'-diisothiocyanatostilbene-2,2'-disulphonic acid (DIDS), but not 10 microM bumetanide or 1 mM acetazolamide. In conclusion, I-154 K+ solution induced-relaxation in the bovine trachea may be due to swelling of smooth muscle cells and the mechanism of swelling is probably involved in DIDS-sensitive anion movement.
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Affiliation(s)
- Takeharu Kaneda
- Division of Veterinary Pharmacology, Nippon Veterinary and Life Science University, Tokyo, Japan
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Dossena S, Vezzoli V, Cerutti N, Bazzini C, Tosco M, Sironi C, Rodighiero S, Meyer G, Fascio U, Fürst J, Ritter M, Fugazzola L, Persani L, Zorowka P, Storelli C, Beck-Peccoz P, Bottà G, Paulmichl M. Functional characterization of wild-type and a mutated form of SLC26A4 identified in a patient with Pendred syndrome. Cell Physiol Biochem 2006; 17:245-56. [PMID: 16791000 DOI: 10.1159/000094137] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Malfunction of the SLC26A4 protein leads to prelingual deafness often associated with mild thyroid dysfunction and goiter. It is assumed that SLC26A4 acts as a chloride/anion exchanger responsible for the iodide organification in the thyroid gland, and conditioning of the endolymphatic fluid in the inner ear. METHODS Chloride uptake studies were made using HEK293-Phoenix cells expressing human wild type SLC26A4 (pendrin) and a mutant (SLC26A4(S28R)) we recently described in a patient with hypothyroidism, goiter and sensorineural hearing loss. RESULTS Experiments are summarized showing the functional characterization of wild type SLC26A4 and a mutant (S28R), which we described recently. This mutant protein is transposed towards the cell membrane, however, its transport capability is markedly reduced if compared to wild-type SLC26A4. Furthermore, we show that the SLC26A4 induced chloride uptake in HEK293-Phoenix cells competes with iodide, and, in addition, that the chloride uptake can be blocked by NPPB and niflumic acid, whereas DIDS is ineffective. CONCLUSIONS The functional characteristics of SLC26A4(S28R) we describe here, are consistent with the clinical phenotype observed in the patient from which the mutant was derived.
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Affiliation(s)
- Silvia Dossena
- Department of Biomolecular Sciences and Biotechnology, Università degli Studi di Milano, Italy
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Coelho RR, Souza EP, Soares PMG, Meireles AVP, Santos GCM, Scarparo HC, Assreuy AMS, Criddle DN. Effects of chloride channel blockers on hypotonicity-induced contractions of the rat trachea. Br J Pharmacol 2003; 141:367-73. [PMID: 14691057 PMCID: PMC1574202 DOI: 10.1038/sj.bjp.0705615] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
1. We have investigated the inhibitory effects of blockers of volume-activated (Cl(vol)) and calcium-activated (Cl(Ca)) chloride channels on hypotonic solution (HS)-induced contractions of rat trachea, comparing their effects with those of the voltage-dependent calcium channel (VDCC) blocker nifedpine. 2. HS elicited large, stable contractions that were partially dependent on the cellular chloride gradient; a reduction to 41.45+/-7.71% of the control response was obtained when extracellular chloride was removed. In addition, HS-induced responses were reduced to 26.8+/-5.6% of the control by 1 microm nifedipine, and abolished under calcium-free conditions, indicating a substantial requirement for extracellular calcium entry, principally via VDCCs. 3. The established Cl(vol) blockers tamoxifen (</=10 microm) and 4,4'-diisothiocyanatostilbene-2,2'-disulphonic acid (1-100 microm), at concentrations previously reported to inhibit Cl(vol) in smooth muscle, did not significantly inhibit HS-induced contractions. 4. In contrast, the recognized Cl(Ca) blocker niflumic acid (NFA; 1-100 microm) produced a reversible, concentration-dependent inhibition of HS responses, with a reduction to 36.6+/-6.4% of control contractions at the highest concentration. The mixed Cl(vol) and Cl(Ca) blocker, 5-nitro 2-(3-phenylpropylamine) benzoic acid (NPPB; 10-100 microm) also elicited concentration-related inhibition of HS-induced contractions, producing a decrease to 35.9+/-11.3% of the control at 100 microm. 5. Our results show that HS induces reversible, chloride-dependent contractions of rat isolated trachea that were inhibited by NFA and NPPB, while exhibiting little sensitivity to recognized blockers of Cl(vol). The data support the possibility that opening of calcium-activated chloride channels under hypotonic conditions in respiratory smooth muscle may ultimately lead to VDCC-mediated calcium entry and contraction.
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Affiliation(s)
- Roberta R Coelho
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
| | - Emmanuel P Souza
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
| | - Pedro M G Soares
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
| | - Ana Vaneska P Meireles
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
| | - Geam C M Santos
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
| | - Henrique C Scarparo
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
- Departamento de Clínica Odontológica da Faculdade de Farmácia, Odontologia e Enfermagem, Universidade Federal do Ceará, R. Monsenhor Furtado w/n, Fortaleza CE 60441-750, Brazil
| | - Ana Maria S Assreuy
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
| | - David N Criddle
- Laboratório de Farmacologia dos Canais Iônicos – LAFACI, Departamento de Ciências Fisiológicas, CCS, Universidade Estadual do Ceará, Av. Paranjana 1700, Fortaleza CE 60740-000, Brazil
- MRC Secretory Control Research Group, The Physiological Laboratory, University of Liverpool, Crown Street, Liverpool L69 3BX
- Author for correspondence:
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