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Yoshioka K, Obara K, Ozawa M, Kiguchi M, Nakao Y, Miyaji H, Yamashita T, Saitoh N, Nakagome Y, Tanaka Y. Alpha-linolenic acid selectively inhibits the contraction of pig coronary arteries mediated through prostanoid TP receptors. J Pharmacol Sci 2024; 155:148-151. [PMID: 38880549 DOI: 10.1016/j.jphs.2024.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 05/24/2024] [Accepted: 06/03/2024] [Indexed: 06/18/2024] Open
Abstract
We examined the inhibitory effects of α-linolenic acid (ALA) on the contractions of pig coronary arteries. ALA concentration-dependently inhibited the contractions elicited by U46619 and prostaglandin F2α without affecting those elicited by 80 mM KCl, histamine, acetylcholine, and serotonin. ALA rightward shifted the concentration-response curve of U46619, and Schild plot analysis revealed that ALA competitively antagonized U46619. Furthermore, ALA inhibited the increase in intracellular Ca2+ concentration caused by TP receptor stimulation but not that caused by FP receptor stimulation. These results suggest that ALA behaves as a selective antagonist of TP receptors in coronary arteries.
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Affiliation(s)
- Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan.
| | - Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Mikoto Ozawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Mayu Kiguchi
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yuri Nakao
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Hinako Miyaji
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Toma Yamashita
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Noboru Saitoh
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yutaka Nakagome
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
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Xu K, Shimizu M, Yamashita T, Fujiwara M, Oikawa S, Ou G, Takazakura N, Kusakabe T, Takahashi K, Kato K, Yoshioka K, Obara K, Tanaka Y. Inhibitory mechanisms of docosahexaenoic acid on carbachol-, angiotensin II-, and bradykinin-induced contractions in guinea pig gastric fundus smooth muscle. Sci Rep 2024; 14:11720. [PMID: 38778154 PMCID: PMC11111694 DOI: 10.1038/s41598-024-62578-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 05/20/2024] [Indexed: 05/25/2024] Open
Abstract
We studied the inhibitory actions of docosahexaenoic acid (DHA) on the contractions induced by carbachol (CCh), angiotensin II (Ang II), and bradykinin (BK) in guinea pig (GP) gastric fundus smooth muscle (GFSM), particularly focusing on the possible inhibition of store-operated Ca2+ channels (SOCCs). DHA significantly suppressed the contractions induced by CCh, Ang II, and BK; the inhibition of BK-induced contractions was the strongest. Although all contractions were greatly dependent on external Ca2+, more than 80% of BK-induced contractions remained even in the presence of verapamil, a voltage-dependent Ca2+ channel inhibitor. BK-induced contractions in the presence of verapamil were not suppressed by LOE-908 (a receptor-operated Ca2+ channel (ROCC) inhibitor) but were suppressed by SKF-96365 (an SOCC and ROCC inhibitor). BK-induced contractions in the presence of verapamil plus LOE-908 were strongly inhibited by DHA. Furthermore, DHA inhibited GFSM contractions induced by cyclopiazonic acid (CPA) in the presence of verapamil plus LOE-908 and inhibited the intracellular Ca2+ increase due to Ca2+ addition in CPA-treated 293T cells. These findings indicate that Ca2+ influx through SOCCs plays a crucial role in BK-induced contraction in GP GFSM and that this inhibition by DHA is a new mechanism by which this fatty acid inhibits GFSM contractions.
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Affiliation(s)
- Keyue Xu
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Miyuki Shimizu
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Toma Yamashita
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Mako Fujiwara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Shunya Oikawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Guanghan Ou
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Naho Takazakura
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Taichi Kusakabe
- Department of Organic Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Keisuke Takahashi
- Department of Organic Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Keisuke Kato
- Department of Organic Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan.
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
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Bouhadoun A, Manikpurage HD, Deschildre C, Zalghout S, Dubourdeau M, Urbach V, Ho-Tin-Noe B, Deschamps L, Michel JB, Longrois D, Norel X. DHA, RvD1, RvD5, and MaR1 reduce human coronary arteries contractions induced by PGE 2. Prostaglandins Other Lipid Mediat 2023; 165:106700. [PMID: 36528331 DOI: 10.1016/j.prostaglandins.2022.106700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/29/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
In patients with coronary artery disease (CAD), plasma levels of pro-inflammatory lipid mediators such as PGE2 and TxA2 are increased. They could increase vascular contraction while EPA and DHA could reduce it. Studies have been mostly conducted on animal vessels. Therefore, the aim of the study was to investigate if EPA, DHA, and DHA-derived metabolites: RvD1, RvD5 and MaR1 can modulate contraction of human coronary arteries (HCA) induced by PGE2 or TxA2 stable analogue (U46619). DHA and EPA relaxed HCA pre-contracted with PGE2. 18 h-incubation with DHA but not EPA reduced the PGE2-induced contractions. Pre-incubation with RvD1, RvD5 and MaR1 reduced the PGE2-induced contractions. Indomethacin did not significantly modify the PGE2 responses. L-NOARG (inhibitor of nitric oxide synthase), reduced only the PGE2-induced contractions in RvD1-treated rings. Finally, FPR2/ALX, GPR32 and LGR6 receptors are detected in HCA by immunofluorescence. Our results indicate that DHA and its metabolites could be beneficial for HCA blood flow and could be a therapeutic perspective for patients with CAD.
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Affiliation(s)
- Amel Bouhadoun
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France
| | - Hasanga D Manikpurage
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France; Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada
| | - Catherine Deschildre
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France
| | - Sara Zalghout
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France
| | | | | | - Benoît Ho-Tin-Noe
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France
| | - Lydia Deschamps
- Hôpital Bichat-Claude Bernard, Assistance Publique-Hôpitaux de Paris, Université Paris Cité Paris, France
| | - Jean-Baptiste Michel
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France
| | - Dan Longrois
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France; Hôpital Bichat-Claude Bernard, Assistance Publique-Hôpitaux de Paris, Université Paris Cité Paris, France
| | - Xavier Norel
- Université Paris Cité and Université Sorbonne Paris Nord, INSERM, LVTS, F-75018 Paris, France.
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Liu G, Obara K, Yoshioka K, Tanaka Y. Pharmacological Studies on the Ca 2+ Influx Pathways in Platelet-Activating Factor (PAF)-Induced Mouse Urinary Bladder Smooth Muscle Contraction. Biol Pharm Bull 2023; 46:997-1003. [PMID: 37394649 DOI: 10.1248/bpb.b22-00923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Platelet-activating factor (PAF) not only acts as a mediator of platelet aggregation, inflammation, and allergy responses but also as a constrictor of various smooth muscle (SM) tissues, including gastrointestinal, tracheal/bronchial, and pregnancy uterine SMs. Previously, we reported that PAF induces basal tension increase (BTI) and oscillatory contraction (OC) in mouse urinary bladder SM (UBSM). In this study, we examined the Ca2+ influx pathways involved in PAF-induced BTI and OC in the mouse UBSM. PAF (10-6 M) induced BTI and OC in mouse UBSM. However, the PAF-induced BTI and OC were completely suppressed by extracellular Ca2+ removal. PAF-induced BTI and OC frequencies were markedly suppressed by voltage-dependent Ca2+ channel (VDCC) inhibitors (verapamil (10-5 M), diltiazem (10-5 M), and nifedipine (10-7 M)). However, these VDCC inhibitors had a minor effect on the PAF-induced OC amplitude. The PAF-induced OC amplitude in the presence of verapamil (10-5 M) was strongly suppressed by SKF-96365 (3 × 10-5 M), an inhibitor of receptor-operated Ca2+ channel (ROCC) and store-operated Ca2+ channel (SOCC), but not by LOE-908 (3 × 10-5 M) (an inhibitor of ROCC). Overall, PAF-induced BTI and OC in mouse UBSM depend on Ca2+ influx and the main Ca2+ influx pathways in PAF-induced BTI and OC may be VDCC and SOCC. Of note, VDCC may be involved in PAF-induced BTI and OC frequency, and SOCC might be involved in PAF-induced OC amplitude.
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Affiliation(s)
- Ge Liu
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
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Obara K, Inaba R, Kawakita M, Murata A, Yoshioka K, Tanaka Y. Effects of NP-1815-PX, a P2X4 Receptor Antagonist, on Contractions in Guinea Pig Tracheal and Bronchial Smooth Muscles. Biol Pharm Bull 2022; 45:1158-1165. [DOI: 10.1248/bpb.b22-00234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Rikako Inaba
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Mirai Kawakita
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Azusa Murata
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
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Yoshioka K, Obara K, Oikawa S, Uemura K, Yamaguchi A, Fujisawa K, Hanazawa H, Fujiwara M, Endoh T, Suzuki T, De Dios Regadera M, Ito D, Saitoh N, Nakagome Y, Yamashita T, Kiguchi M, Saito Y, Nakao Y, Miyaji H, Ou G, Xu K, Tanaka Y. Eicosapentaenoic acid (EPA)-induced inhibitory effects on porcine coronary and cerebral arteries involve inhibition of prostanoid TP receptors. Sci Rep 2022; 12:12829. [PMID: 35896794 PMCID: PMC9329469 DOI: 10.1038/s41598-022-16917-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 07/18/2022] [Indexed: 11/23/2022] Open
Abstract
This study was performed to elucidate whether eicosapentaenoic acid (EPA) suppresses spasm-prone blood vessel contractions induced by a thromboxane mimetic (U46619) and prostaglandin F2α (PGF2α) and determine whether the primary target of EPA is the prostanoid TP receptor. Accordingly, we assessed: (1) the tension changes in porcine basilar and coronary arteries, and (2) changes in the Fura-2 (an intracellular Ca2+ indicator) fluorescence intensity ratio at 510 nm elicited by 340/380 nm excitation (F340/380) in 293T cells expressing the human TP receptor (TP-293T cells) and those expressing the human prostanoid FP receptor (FP-293T cells). EPA inhibited both porcine basilar and coronary artery contractions induced by U46619 and PGF2α in a concentration-dependent manner, but it did not affect the contractions induced by 80 mM KCl. EPA also inhibited the increase in F340/380 induced by U46619 and PGF2α in TP-293T cells. In contrast, EPA showed only a marginal effect on the increase in F340/380 induced by PGF2α in FP-293T cells. These findings indicate that EPA strongly suppresses the porcine basilar and coronary artery contractions mediated by TP receptor and that inhibition of TP receptors partly underlies the EPA-induced inhibitory effects on these arterial contractions.
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Affiliation(s)
- Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan.
| | - Shunya Oikawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Kohei Uemura
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Akina Yamaguchi
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Kazuki Fujisawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Hitomi Hanazawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Miki Fujiwara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Taison Endoh
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Taichi Suzuki
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Montserrat De Dios Regadera
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Daichi Ito
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Noboru Saitoh
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yutaka Nakagome
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Toma Yamashita
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Mayu Kiguchi
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yuka Saito
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yuri Nakao
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Hinako Miyaji
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Guanghan Ou
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Keyue Xu
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi-City, Chiba, 274-8510, Japan
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Xu K, Shimizu M, Murai C, Fujisawa M, Ito D, Saitoh N, Nakagome Y, Yamashita M, Murata A, Oikawa S, Ou G, Yoshioka K, Obara K, Tanaka Y. Docosahexaenoic acid and eicosapentaenoic acid strongly inhibit prostanoid TP receptor-dependent contractions of guinea pig gastric fundus smooth muscle. Pharmacol Res Perspect 2022; 10:e00952. [PMID: 35466586 PMCID: PMC9035583 DOI: 10.1002/prp2.952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 04/05/2022] [Indexed: 11/28/2022] Open
Abstract
The inhibitory effects of docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), and linoleic acid (LA) on the contractions induced by five prostanoids and U46619 (a TP receptor agonist) were examined in guinea pig gastric fundus smooth muscle (GFSM). Tension changes were isometrically measured, and the mRNA expression of prostanoid receptors was measured by RT‐qPCR. DHA and EPA significantly inhibited contractions induced by the prostanoids and U46619, whereas LA inhibited those induced by prostaglandin D2 and U46619. The mRNA expression levels of the prostanoid receptors were TP ≈ EP3 >> FP > EP1. The inhibition by DHA, EPA, and LA was positively correlated with that by SQ 29,548 (a TP receptor antagonist) but not with that by L‐798,106 (an EP3 receptor antagonist). DHA and EPA suppressed high KCl‐induced contractions by 35% and 25%, respectively, and the contractions induced by the prostanoids and U46619 were suppressed by verapamil, a voltage‐dependent Ca2+ channel (VDCC) inhibitor, by 40%–85%. Although LA did not suppress high KCl‐induced contractions, it suppressed U46619‐induced contractions in the presence of verapamil. However, LA did not show significant inhibitory effects on U46619‐induced Ca2+ increases in TP receptor‐expressing cells. In contrast, LA inhibited U46619‐induced contractions in the presence of verapamil, which was also suppressed by SKF‐96365 (a store‐operated Ca2+ channel [SOCC] inhibitor). These findings suggest that the TP receptor and VDCC are targets of DHA and EPA to inhibit prostanoid‐induced contractions of guinea pig GFSM, and SOCCs play a significant role in LA‐induced inhibition of U46619‐induced contractions.
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Affiliation(s)
- Keyue Xu
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Miyuki Shimizu
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Chika Murai
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Miki Fujisawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Daichi Ito
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Noboru Saitoh
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Yutaka Nakagome
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Mio Yamashita
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Azusa Murata
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Shunya Oikawa
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Guanghan Ou
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University, Funabashi-City, Chiba, Japan
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8
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Obara K, Inaba R, Kawakita M, De Dios Regadera M, Uetake T, Murata A, Nishioka N, Kuroki K, Yoshioka K, Tanaka Y. Docosahexaenoic Acid Selectively Suppresses U46619- and PGF 2α-Induced Contractions in Guinea Pig Tracheal Smooth Muscles. Biol Pharm Bull 2022; 45:240-244. [PMID: 35110511 DOI: 10.1248/bpb.b21-00905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated the potential inhibitory effects of docosahexaenoic acid (DHA) on the contractions of guinea pig tracheal smooth muscles in response to U46619 (a thromboxane A2 (TXA2) mimetic) and prostaglandin F2α (PGF2α) to examine whether this n-3 polyunsaturated fatty acid suppresses prostanoid-induced tracheal contractions. DHA (3 × 10-5 M) significantly suppressed tracheal contractions elicited by lower concentrations of U46619 (10-8 M) and PGF2α (5 × 10-7 M) (vs. control), although it did not suppress the contractions induced by higher concentrations (U46619: 10-7 M; PGF2α: 10-5 M). Supporting these findings, DHA (4 × 10-5 M/6 × 10-5 M) shifted the concentration-response curves for U46619 (10-9-10-6 M) and PGF2α (10-8-10-5 M) to the right. However, the slope of the regression line in the Schild plot of DHA vs. U46619/PGF2α was larger than unity. The tracheal contractions induced by U46619 (10-8 M) and PGF2α (5 × 10-7 M) were significantly suppressed by the prostanoid TP receptor antagonist SQ 29,548 (10-6 M) (vs. ethanol-treated). In contrast, DHA (4 × 10-5 M) did not show significant inhibitory effects on the contractions induced by acetylcholine (10-8-10-4 M), histamine (10-8-10-4 M), and leukotriene D4 (10-11-10-7 M) (vs. ethanol-treated). These findings indicate that DHA selectively suppresses tracheal contractions induced by U46619 and PGF2α. Therefore, DHA may be a useful therapeutic agent against asthma associated with tracheal/bronchial hyper-constriction caused by prostanoids including TXA2 and PGF2α.
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Affiliation(s)
- Keisuke Obara
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Rikako Inaba
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Mirai Kawakita
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | | | - Tomomi Uetake
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Azusa Murata
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Nanako Nishioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Kota Kuroki
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Kento Yoshioka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
| | - Yoshio Tanaka
- Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University
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