1
|
Wu S, Ootawa T, Sekio R, Smith H, Islam MZ, Nguyen HTT, Uno Y, Shiraishi M, Miyamoto A. Reduced Nitric Oxide Synthase Involvement in Aigamo Duck Basilar Arterial Relaxation. Animals (Basel) 2023; 13:2740. [PMID: 37685004 PMCID: PMC10486467 DOI: 10.3390/ani13172740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 08/20/2023] [Accepted: 08/26/2023] [Indexed: 09/10/2023] Open
Abstract
The basilar arterial endothelium mediates blood vessel relaxation partly through the release of nitric oxide (NO). Apoptosis of cerebrovascular endothelial cells is linked to a high mortality rate in chickens infected with the highly pathogenic avian influenza virus, but interestingly, ducks exhibit a greater resistance to this virus. In this study, we examined the responsiveness of duck basilar arteries (BAs) to various vasoactive substances, including 5-hydroxytryptamine (5-HT), histamine (His), angiotensin (Ang) II, noradrenaline (NA), acetylcholine (ACh), and avian bradykinin ornithokinin (OK), aiming to characterize the receptor subtypes involved and the role of endothelial NO in vitro. Our findings suggest that arterial contraction is mediated with 5-HT1 and H1 receptors, while relaxation is induced with β3-adrenergic and M3 receptors. Additionally, OK elicited a biphasic response in duck BAs, and Ang II had no effect. Endothelial NO appears to be crucial in relaxation mediated with M3 and OK receptors but not β3-adrenergic receptors in the duck BA. The reduced endothelial NO involvement in the receptor-mediated relaxation response in duck BAs represents a clear difference from the corresponding response reported in chicken BAs. This physiological difference may explain the differences in lethality between ducks and chickens when vascular endothelial cells are infected with the virus.
Collapse
Affiliation(s)
- Siyuan Wu
- Department of Basic Veterinary Science, Joint Graduate School of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Tomoki Ootawa
- Department of Basic Veterinary Science, Joint Graduate School of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
- Japan Wildlife Research Center, 3-3-7 Kotobashi, Tokyo 130-8606, Japan
| | - Ryoya Sekio
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Henry Smith
- Department of Basic Veterinary Science, Joint Graduate School of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Md. Zahorul Islam
- Department of Pharmacology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Ha Thi Thanh Nguyen
- Department of Veterinary Pharmacology and Toxicology, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Gia Lam, Hanoi 131000, Vietnam
| | - Yasuhiro Uno
- Department of Basic Veterinary Science, Joint Graduate School of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Basic Veterinary Science, Joint Graduate School of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Atsushi Miyamoto
- Department of Basic Veterinary Science, Joint Graduate School of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
2
|
Suzuki M, Wu S, Ootawa T, Smith H, Shiraishi M, Miyamoto A, Matsuoka Y, Sawa S, Mori M, Mori H, Yamori Y. Relationship between Regional Distribution of Centenarians and Drinking Water Hardness in the Amami Islands, Kagoshima Prefecture, Japan. Nutrients 2023; 15:nu15071569. [PMID: 37049410 PMCID: PMC10096677 DOI: 10.3390/nu15071569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/09/2023] [Accepted: 03/20/2023] [Indexed: 03/31/2023] Open
Abstract
People who drink naturally hardened water may experience longevity-enhancing effects. In this study, we investigated water hardness and longevity from both geological and epidemiological perspectives in Japan’s Amami islands, where drinking water is drawn from coralline or non-coralline bedrock. We investigated drinking water hardness, limestone bedrock occupancy, and the centenarian rate (number per 10,000 population) by municipality across four adjacent islands (Amami-Oshima (non-coralline), Tokunoshima, Okinoerabu, and Yoron (predominantly coralline)). Limestone was strongly correlated with water hardness (r = 0.99; p < 0.01), occupying more than 80% of the bedrock where the water was the hardest (Tokunoshima’s Isen municipality: 86.5%; Yoron: 82.9%) and being scarcely detectable in Amami-Oshima (0.0 to 0.2%), where the water was the least hard. The centenarian rate was also strongly correlated with water hardness (r = 0.84, p < 0.01), with the highest figures in Yoron (29.7) and Isen (29.2), and the lowest in Amami-Oshima (0.0 to 12.2). Therefore, we hypothesize a potentially beneficial effect of hard water on longevity when that water is drawn from coralline limestone. Water hardness is determined by the water content of calcium and magnesium and may plausibly influence life expectancy through a preventative effect against cardiovascular disease. Our findings are of interest to current debates about future global access to drinking water and its quality.
Collapse
|
3
|
Wu S, Ootawa T, Sekio R, Smith H, Islam MZ, Uno Y, Shiraishi M, Miyamoto A. Involvement of beta3-adrenergic receptors in relaxation mediated by nitric oxide in chicken basilar artery. Poult Sci 2023; 102:102633. [PMID: 37001317 PMCID: PMC10070147 DOI: 10.1016/j.psj.2023.102633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 02/21/2023] [Accepted: 03/02/2023] [Indexed: 03/09/2023] Open
Abstract
The response of basilar arteries to noradrenaline varies among many animal species, but remains little studied in poultry. Accordingly, we aimed to characterize the adrenergic receptor (AR) subtypes that modulate vascular response in basilar arteries in the chicken, with isometric recording of arterial ring tension using an organ bath. We demonstrated the presence of both alpha and beta (α and β) receptor subtypes through evaluating the response to noradrenaline, with and without a range of β-AR and α-AR antagonists. The concentration-dependent relaxations then induced by a range of β-AR agonists indicated a potency ranking of isoproterenol > noradrenaline > adrenaline > procaterol. We then investigated the effects of β-AR antagonists that attenuate the effect of isoproterenol (propranolol for β1,2,3-ARs, atenolol for β1-ARs, butoxamine for β2-ARs, and SR 59230A for β3-ARs), with Schild regression analysis, ascertaining multiple β-AR subtypes, with neither the β1-AR nor the β2-AR as the dominant subtype. SR 59230A was the only antagonist to yield a pA2 value (7.52) close to the reported equivalent for the relevant receptor subtype. Furthermore, treatment with SR 58611 (a β3-AR agonist) induced relaxation, which was inhibited (P < 0.01) by L-NNA and SR 59230A. Additionally, treating basilar arterial strips (containing endothelium) with SR 58611 induced nitric oxide (NO) production, which was inhibited (P < 0.01) by L-NNA and SR 59230A. Based on this first characterization of AR subtypes in chicken basilar arteries (to our knowledge), we suggest that α- and β-ARs are involved in contraction and relaxation, and that β3-ARs, especially those on the endothelium, may play an important role in vasodilation via NO release.
Collapse
|
4
|
Uno Y, Morikuni S, Shiraishi M, Asano A, Murayama N, Yamazaki H. Novel cytochrome P450 2C94 (CYP2C94) functionally metabolizes diclofenac and omeprazole in dogs. Drug Metab Dispos 2023; 51:637-644. [PMID: 36754837 DOI: 10.1124/dmd.122.001236] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/11/2023] [Accepted: 01/30/2023] [Indexed: 02/10/2023] Open
Abstract
Cytochromes P450 (P450s or CYPs) are important drug-metabolizing enzymes. Because dogs are frequently used in drug metabolism studies, knowledge of dog CYP2C enzymes is essential because, in humans, these enzymes are abundant and play major roles in liver and intestine. The present study identified and characterized novel dog CYP2C94 along with previously identified dog CYP2C21 and CYP2C41. Dog CYP2C21, CYP2C41, and CYP2C94 cDNAs, respectively, contained open reading frames of 490, 489, and 496 amino acids and shared high sequence identities (70%, 75%, and 58%) with human CYP2Cs. Dog CYP2C94 mRNA was preferentially expressed in liver, just as dog CYP2C21 and CYP2C41 mRNAs were. In dog liver, CYP2C21 mRNA was the most abundant, followed by CYP2C94 and CYP2C41 mRNAs. Moreover, the hepatic expressions of all three dog CYP2C mRNAs varied in four individual dogs, two of which did not express CYP2C41 mRNA. The three dog CYP2C genes had similar gene structures, and CYP2C94, although located on the same chromosome, was in a genomic region far from the gene cluster containing CYP2C21 and CYP2C41 Metabolic assays with recombinant proteins showed that dog CYP2C94, along with CYP2C21 and CYP2C41, efficiently catalyzed oxidations of diclofenac, warfarin, and/or omeprazole, indicating that dog CYP2C94 is a functional enzyme. Novel dog CYP2C94 is expressed abundantly in liver and encodes a functional enzyme that metabolizes human CYP2C substrates; it is, therefore, likely responsible for drug clearances in dogs. Significance Statement Novel dog cytochrome P450 2C94 (CYP2C94) was identified and characterized, along with dog CYP2C21 and CYP2C41. Dog CYP2C94, isolated from liver, had 58% sequence identity and a close phylogenetic relationship with its human homologs and was expressed in liver at the mRNA level. Dog CYP2C94 (and CYP2C21 and CYP2C41) catalyzed oxidations of diclofenac and omeprazole, human CYP2C9 and CYP2C19 substrates, respectively, but CYP2C41 also hydroxylated warfarin. CYP2C94 is, therefore, a functional drug-metabolizing enzyme likely responsible for drug clearances in dogs.
Collapse
Affiliation(s)
| | | | | | | | | | - Hiroshi Yamazaki
- Lab. Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Japan
| |
Collapse
|
5
|
Nii T, Islam MZ, Kake S, Shiraishi M, Takeuchi T, Kuwata H, Miyamoto A, Harada E. Direct evidence of nitric oxide production induced by lactoferrin and its enhancement by magnesium ions in cultured endothelial cells. J Vet Med Sci 2022; 84:1499-1501. [PMID: 36171111 DOI: 10.1292/jvms.22-0368] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Bovine lactoferrin (BLF) reportedly lowers blood pressure and induces vasorelaxation, but its effect on nitric oxide (NO) production has not been established. Accordingly, we aimed to determine whether BLF induces NO production in bovine aortic endothelial cells, and the effects of extracellular free magnesium (Mg) ion concentrations on this NO production. BLF induced NO production time-dependently. NO production was markedly inhibited by the NO synthase inhibitor, NG-nitro-L-arginine methyl ester, in an effect abolished by L-arginine, but not D-arginine. NO production was suppressed at low concentrations, and enhanced at high concentrations, of Mg ions in culture medium. These results suggest that BLF has an important role in hypotensive effects. Mg ions may affect BLF-induced NO production.
Collapse
Affiliation(s)
- Tomoaki Nii
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University
| | - Md Zahorul Islam
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University.,Department of Pharmacology, Faculty of Veterinary Science, Bangladesh Agricultural University
| | - Satoru Kake
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University
| | - Takashi Takeuchi
- Department of Veterinary Medicine, Faculty of Agriculture, Tottori University
| | | | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University
| | | |
Collapse
|
6
|
Uno Y, Morikuni S, Shiraishi M, Asano A, Kawaguchi H, Murayama N, Yamazaki H. A comprehensive analysis of six forms of cytochrome P450 2C (CYP2C) in pigs. Xenobiotica 2022; 52:963-972. [PMID: 36373600 DOI: 10.1080/00498254.2022.2148139] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Pigs are an important species used in drug metabolism studies; however, the cytochromes P450 (P450s or CYPs) have not been fully investigated in pigs.In this study, pig CYP2C32, CYP2C33, CYP2C34, CYP2C36, CYP2C42, and CYP2C49 cDNAs were isolated and found to contain open reading frames of 490 or 494 amino acids that shared 64-82% sequence identity with human CYP2C8/9/18/19.Pig CYP2C genes formed a gene cluster in a genomic region that corresponded to that of the human CYP2C cluster; an additional gene cluster was formed by pig CYP2C33a and CYP2C33b distant from the first cluster but located in the same chromosome.Among the tissues analysed, these pig CYP2C mRNAs were preferentially expressed in liver, small intestine, and/or kidney; pig CYP2C49, CYP2C32, CYP2C34, and CYP2C33 mRNAs were the most abundant CYP2C mRNAs in liver, jejunum, ileum, and kidney, respectively.Metabolic assays showed that pig CYP2C proteins (heterologously expressed in Escherichia coli) metabolised typical human CYP2C substrates diclofenac, warfarin, and/or omeprazole.The results suggest that these pig CYP2Cs are functional enzymes able to metabolise human CYP2C substrates in liver and small intestine, just as human CYP2Cs do.
Collapse
Affiliation(s)
- Yasuhiro Uno
- Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima-city, Japan
| | - Saho Morikuni
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Machida, Japan
| | - Mitsuya Shiraishi
- Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima-city, Japan
| | - Atsushi Asano
- Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima-city, Japan
| | | | - Norie Murayama
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Machida, Japan
| | - Hiroshi Yamazaki
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Machida, Japan
| |
Collapse
|
7
|
Naitou K, Iwashita H, Ueda HH, Shiraishi M, Fujimoto Y, Horii K, Sawamura T, Shiina T, Shimizu Y. Intrathecally administered substance P activated the spinal defecation center and enhanced colorectal motility in anesthetized rats. Am J Physiol Gastrointest Liver Physiol 2022; 323:G21-G30. [PMID: 35470689 DOI: 10.1152/ajpgi.00342.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Noxious stimuli on the colorectum cause colorectal contractions through activation of descending monoaminergic pathways projecting from the supraspinal defecation center to the spinal defecation center. Since it is known that substance P is involved in the response to peripheral noxious stimuli in the spinal cord, we investigated the effects of intrathecally administered substance P at L6-S1 levels on colorectal motility in rats that were anesthetized with α-chloralose and ketamine. Intrathecally administered substance P enhanced colorectal motility, even after transection of the thoracic spinal cord at the T4 level. Severing the pelvic nerves, but not the colonic nerves, abolished substance P enhanced colorectal motility. In the spinal cord at L6-S1 levels, expression of mRNA coding neurokinin (NK) 1-3 receptors was detected by RT-PCR. Immunohistological experiments revealed that preganglionic neurons of the pelvic nerves express NK1 receptors, whereas expression of NK2 receptors was not found. In addition, substance P-containing fibers densely innervated around the preganglionic neurons expressing NK1 receptors. An intrathecally administered NK1 receptor antagonist (spantide) attenuated capsaicin-induced colorectal contractions. These results suggest that the colokinetic action of substance P is mediated by the NK1 receptor in the spinal defecation center. Our findings indicate that substance P may function as a neurotransmitter in the spinal defecation center.NEW & NOTEWORTHY We found that intrathecally administered substance P enhanced colorectal motility in anesthetized rats. Neurokinin (NK) 1 receptors, but not NK2 receptors, were detected in preganglionic neurons of the pelvic nerves. Blockade of NK1 receptors in the spinal cord attenuated the enhanced colorectal motility in response to intracolonic noxious stimuli. The findings indicate that substance P may function as a neurotransmitter in the spinal reflex pathway controlling defecation.
Collapse
Affiliation(s)
- Kiyotada Naitou
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | - Honoka Iwashita
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | - Hiromi H Ueda
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | - Mitsuya Shiraishi
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | - Yoshikazu Fujimoto
- Transboundary Animal Diseases Research Center, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | - Kazuhiro Horii
- Department of Basic Veterinary Science, Laboratory of Physiology, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Tomoya Sawamura
- Department of Basic Veterinary Science, Laboratory of Physiology, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Takahiko Shiina
- Department of Basic Veterinary Science, Laboratory of Physiology, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Yasutake Shimizu
- Department of Basic Veterinary Science, Laboratory of Physiology, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| |
Collapse
|
8
|
Uno Y, Uehara S, Ijiri M, Kawaguchi H, Asano A, Shiraishi M, Banju K, Murayama N, Yamazaki H. Molecular and functional characterization of N -acetyltransferase s in common marmosets and pigs. Drug Metab Dispos 2022; 50:1429-1433. [PMID: 35768074 DOI: 10.1124/dmd.122.000919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 06/08/2022] [Indexed: 11/22/2022] Open
Abstract
Arylamine N-acetyltransferases (NATs) are drug-metabolizing enzymes essential for the metabolism of endogenous substrates and xenobiotics. The molecular characteristics of NATs have been extensively investigated in humans but remain to be investigated in common marmosets and pigs, animal species that are often used in drug metabolism studies. In this study, marmoset NAT1 and pig NAT1 cDNAs were isolated from liver samples and were characterized by molecular analyses and drug-metabolism assays. These NAT genes were intronless and formed gene clusters with one other NAT gene in the genome, just as human NAT genes do. Marmoset NAT1 and pig NAT1 amino acid sequences showed high sequence identities (94% and 85%, respectively) to human NAT1. Phylogenetic analysis indicated that marmoset NAT1 and pig NAT1 were more closely clustered with human NATs than with rat or mouse NATs. Marmoset NAT1 and pig NAT1 mRNAs were expressed in all the tissue types analyzed, with the expression levels being highest in small intestine. Metabolic assays using recombinant proteins found that marmoset NAT1 and pig NAT1 metabolized human NAT substrates p-aminobenzoic acid, 2-aminofluorene, sulfamethazine, and isoniazid. Marmoset NAT1 and pig NAT1 substantially acetylated p-aminobenzoic acid and 2-aminofluorene relevant human NAT1, but their activities were lower toward sulfamethazine and isoniazid than those of the relevant human NAT2. Therefore, marmoset and pig NATs are functional enzymes with molecular similarities to human NAT1, but their substrate specificities, while similar to human NAT1, differ somewhat from human NAT2. Significance Statement Marmoset N-acetyltransferase NAT1 and pig NAT1 were identified and showed high sequence identities to human NAT1. These NAT mRNAs were expressed in various tissues. Marmoset and pig NAT1s acetylated typical human NAT substrates, although their substrate specificities differed somewhat from human NAT2. Marmoset NAT1 and pig NAT1 have similarities with human NAT1 in terms of molecular and enzymatic characteristics.
Collapse
Affiliation(s)
| | - Shotaro Uehara
- Laboratory Animal Research Department, Central Institute for Experimental Animals, Japan
| | | | | | | | | | | | | | - Hiroshi Yamazaki
- Lab. Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Japan
| |
Collapse
|
9
|
Uno Y, Murayama N, Ijiri M, Kawaguchi H, Yamato O, Shiraishi M, Asano A, Teraoka H, Mizukawa H, Nakayama SMM, Ikenaka Y, Ishizuka M, Yamazaki H. Cytochrome P450 2J (CYP2J) Genes in Dogs, Cats, and Pigs Are Expressed and Encode Functional Drug-Metabolizing Enzymes. Drug Metab Dispos 2022; 50:1434-1441. [PMID: 35701183 DOI: 10.1124/dmd.122.000930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 05/18/2022] [Indexed: 11/22/2022] Open
Abstract
Cytochromes P450 (P450 or CYP) have been identified and analyzed in dogs and pigs, species that are often used in preclinical drug studies. Moreover, P450s are clinically important for drug therapy not only in humans but also in species under veterinary care, including dogs and cats. In the present study, seven P450s homologous to human CYP2J2, namely, dog CYP2J2; cat CYP2J2; and pig CYP2J33, CYP2J34, CYP2J35, CYP2J91, and CYP2J93, were newly identified and characterized. The cDNAs of these CYP2Js contained open reading frames of 502 amino acids, except for CYP2J35 (498 amino acids), and shared high sequence identity (77-80%) with human CYP2J2. Phylogenetic analysis revealed that dog and cat CYP2J2 were closely related, whereas pig CYP2Js formed a cluster. All seven CYP2J genes contain nine coding exons and are located in corresponding genomic regions, with the pig CYP2J genes forming a gene cluster. These CYP2J2 mRNAs were predominantly expressed in small intestine with additional expression in kidney and brain for dog CYP2J2 and pig CYP2J91 mRNAs, respectively. All seven CYP2Js metabolized human CYP2J2 substrates terfenadine, ebastine, and astemizole, indicating that they are functional enzymes. Dog CYP2J2 and pig CYP2J34 and CYP2J35 efficiently catalyzed ebastine primary hydroxylation and secondary carebastine formation at low substrate concentrations, just as human CYP2J2 does. Velocity-versus-substate plots exhibited sigmoidal relationships for dog CYP2J2, cat CYP2J2, and pig CYP2J33, indicating allosteric interactions. These results suggest that dog, cat, and pig CYP2Js have similar functional characteristics to human CYP2J2, with slight differences in ebastine and astemizole oxidations. Significance Statement New dog cytochrome P450 2J2 (CYP2J2); cat CYP2J2; and pig CYP2J33, CYP2J34, CYP2J35, CYP2J91, and CYP2J93, homologous to human CYP2J2, were identified and characterized by sequence, phylogenetic, and genomic structure analyses. Intestinal expression patterns of CYP2J mRNAs were characteristic in dogs, cats, and pigs. Dog, cat, and pig CYP2Js likely play roles as drug-metabolizing enzymes in small intestine, similar to human CYP2J2.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Mayumi Ishizuka
- Graduate School of Veterinary Medicine, Hokkaido University, Japan
| | - Hiroshi Yamazaki
- Lab. Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Japan
| |
Collapse
|
10
|
Shiraishi M, Nakagawa K, Ando T, Nishitani-Gamo M. The effect of copper on the multiple carbon nanofilaments growths by the methane decomposition over the oxidized diamond-supported nickel–copper bimetallic catalyst. SN Appl Sci 2022. [DOI: 10.1007/s42452-022-05015-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
AbstractTo clarify the indispensable parameters for the multiple carbon nanofilaments (CNFs) growths, in other words, having a unique Octopus-like morphology consisting of the Marimo-like carbon (MC), we have systematically studied to synthesize the MC by the decomposition of methane using oxidized diamond-supported Ni–Cu bimetallic catalysts. We discovered that a Cu addition of 20 wt.% by weight and a growth temperature in the region of 550 °C to 600 °C resulted in many CNF forms from a single catalyst particle, specifically the "Octopus-like" morphology of CNFs. We also discovered that the several CNFs forms might occur from the carbon dissolved in the sintered catalyst particles. We described a model process of the unique structure formation. We expect that the Octopus-like CNFs growth gives enough space volume in the MC for a mass transfer, consequently, it should contribute to realizing a higher power generation performance of a polymer electrolyte fuel cell (PEFC) although under a higher-voltage generation region.
Collapse
|
11
|
Islam MZ, Kojima S, Sameshima M, Obi T, Yamazaki-Himeno E, Shiraishi M, Miyamoto A. Vasomotor effects of noradrenaline, 5-hydroxytryptamine, angiotensin II, bradykinin, histamine, and acetylcholine on the bat (Rhinolophus ferrumequinum) basilar artery. Comp Biochem Physiol C Toxicol Pharmacol 2021; 250:109190. [PMID: 34536573 DOI: 10.1016/j.cbpc.2021.109190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 08/31/2021] [Accepted: 09/11/2021] [Indexed: 11/30/2022]
Abstract
The responsiveness of the basilar artery to intrinsic vasoactive substances is species-specific and can be a unique characteristic. We investigated the responsiveness of the bat (Rhinolophus ferrumequinum) basilar artery to noradrenaline (NA), 5-hydroxytryptamine (5-HT), angiotensin (Ang) II, bradykinin (BK), histamine (His), and acetylcholine (ACh). NA, 5-HT, Ang II, and BK induced contraction, whereas His and ACh induced relaxation, in a concentration-dependent manner. The NA cumulative concentration-response curve was shifted to the right in parallel with phentolamine (an α-antagonist). However, propranolol, a β-antagonist, had no significant effect. The 5-HT curve was shifted to the right in parallel by ketanserin (a 5-HT2 antagonist) and methiothepin (a 5-HT1 and 5-HT2 antagonist). Losartan (an AT1 antagonist) shifted the Ang II curve to the right, whereas PD123319 (an AT2 antagonist) had no significant effect. L-NA, indomethacin, and des-Arg9-[Leu8]-BK (a B1 antagonist) did not significantly affect BK-induced contractions. HOE140 (a B2 antagonist) shifted the BK concentration-response curve to the right. The His curve was shifted to the right weakly by diphenhydramine (an H1 antagonist) and strongly by cimetidine (a H2 antagonist). ACh-induced relaxation was significantly inhibited by L-NA, atropine, and pFHHSiD (a muscarinic M3 antagonist), whereas pirenzepine and methoctramine (muscarinic M1 and M2 antagonists, respectively) showed no significant effects. At a resting vascular tone, L-NA-induced contraction and indomethacin induced relaxation. These results suggest that α-adrenergic, 5-HT1, 5-HT2, AT1, and B2 receptors might be important in arterial contraction, whereas M3 and H2 (>H1) receptors might modify these contractions, inducing relaxation.
Collapse
Affiliation(s)
- Md Zahorul Islam
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan; Department of Pharmacology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Shusuke Kojima
- Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Masamichi Sameshima
- Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Takeshi Obi
- Department of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Emi Yamazaki-Himeno
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
| |
Collapse
|
12
|
Abstract
Microparticles (MPs) are released from budding plasma membranes into body fluids. The use of flow cytometry for the measurement of MP in canines has not been standardized. In this fundamental study, we compared the effect of anticoagulant agents, such as acid-citrate-dextrose (ACD) and heparin on the measurement of canine MPs in platelet-free plasma (PFP) using flow cytometry. In addition, we used annexin V, carboxyfluorescein succinimidyl ester (CFSE), or calcein tetraacetoxymethyl ester (calcein-AM), and explored the characteristics of the staining reagents in MP detection using flow cytometry. We were able to measure canine MPs in PFP prepared from ACD-anticoagulated blood using flow cytometry, in which the highest positive rate for fluorescent staining was observed when CFSE was used.
Collapse
Affiliation(s)
- Tsuyoshi Ozawa
- Department of Veterinary Physiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Takashi Ijichi
- Department of Veterinary Physiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Physiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
13
|
Ozawa T, Miura N, Hasegawa H, Uemura T, Nakamoto Y, Tsujio M, Takeuchi T, Shiraishi M. Characteristics and outcome of suspected cerebrovascular disease in dogs: 66 cases (2009-2016). J Small Anim Pract 2021; 63:45-51. [PMID: 34585398 DOI: 10.1111/jsap.13422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 05/27/2021] [Accepted: 08/17/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To characterise the clinical signs of suspected cerebrovascular disease in dogs. MATERIALS AND METHODS Medical records of one hospital were searched from November 2009 to December 2016 for dogs that suffered of cerebrovascular disease. We diagnosed cerebrovascular disease based on acute onset, clinical signs and magnetic resonance imaging findings. The medical history, clinical signs, concurrent disease, area of infarction, cerebrospinal fluid results, month at onset and outcome were investigated in the cerebrovascular disease group and in a control group (dogs with brain disorders other than cerebrovascular disease). RESULTS A total of 122 CVD cases were extracted from the 5312 patients that visited during the study period. Of these 122 cases, 66 (1.2%) matched the subject selection criteria of our study and were included in the analysis. Forebrain infarction was observed in 51 of 66 cases, of which 24 (47.1%) suffered from seizures. The number of dogs diagnosed with cerebrovascular disease was disproportionately high in August (nine of 59 cases) and December (13 of 59 cases). In the outcome survey, deterioration was observed in 11 of 55 cases. CLINICAL SIGNIFICANCE Seizure is an important clinical sign of cerebrovascular disease in dogs. There was a significant seasonal variation in the number of dogs diagnosed with cerebrovascular disease in Japan. Clinical features observed in this report differ from those of previous reports and highlight the need for additional research in this area.
Collapse
Affiliation(s)
- T Ozawa
- KyotoAR Veterinary Neurology Center, Kyoto, 613-0036, Japan.,The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - N Miura
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, 890-0065, Japan
| | - H Hasegawa
- KyotoAR Veterinary Neurology Center, Kyoto, 613-0036, Japan
| | - T Uemura
- KyotoAR Veterinary Neurology Center, Kyoto, 613-0036, Japan
| | | | - M Tsujio
- Laboratory of Veterinary Anatomy, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, 890-0065, Japan
| | - T Takeuchi
- Department of Veterinary Laboratory Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, Tottori, 680-8553, Japan
| | - M Shiraishi
- Department of Veterinary Physiology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, 890-0065, Japan
| |
Collapse
|
14
|
Ueda HH, Naitou K, Nakamori H, Horii K, Shiina T, Masatani T, Shiraishi M, Shimizu Y. α-MSH-induced activation of spinal MC1R but not MC4R enhances colorectal motility in anaesthetised rats. Sci Rep 2021; 11:487. [PMID: 33436759 PMCID: PMC7803980 DOI: 10.1038/s41598-020-80020-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 12/11/2020] [Indexed: 12/15/2022] Open
Abstract
The central nervous system is involved in regulation of defaecation. It is generally considered that supraspinal regions control the spinal defaecation centre. However, signal transmission from supraspinal regions to the spinal defaecation centre is still unclear. In this study, we investigated the regulatory role of an anorexigenic neuropeptide, α-MSH, in the spinal defaecation centre in rats. Intrathecal administration of α-MSH to the L6-S1 spinal cord enhanced colorectal motility. The prokinetic effect of α-MSH was abolished by severing the pelvic nerves. In contrast, severing the colonic nerves or thoracic cord transection at the T4 level had no impact on the effect of α-MSH. RT-PCR analysis revealed MC1R mRNA and MC4R mRNA expression in the L6-S1 spinal cord. Intrathecally administered MC1R agonists, BMS470539 and SHU9119, mimicked the α-MSH effect, but a MC4R agonist, THIQ, had no effect. These results demonstrate that α-MSH binds to MC1R in the spinal defaecation centre and activates pelvic nerves, leading to enhancement of colorectal motility. This is, to our knowledge, the first report showing the functional role of α-MSH in the spinal cord. In conclusion, our findings suggest that α-MSH is a candidate for a neurotransmitter from supraspinal regions to the spinal defaecation centre.
Collapse
Affiliation(s)
- Hiromi H Ueda
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima, 890-0065, Japan
| | - Kiyotada Naitou
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima, 890-0065, Japan
| | - Hiroyuki Nakamori
- Department of Cell Physiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Kazuhiro Horii
- Laboratory of Physiology, Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | - Takahiko Shiina
- Laboratory of Physiology, Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | - Tatsunori Masatani
- Transboundary Animal Diseases Research Center, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima, 890-0065, Japan
| | - Yasutake Shimizu
- Laboratory of Physiology, Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan. .,Center for Highly Advanced Integration of Nano and Life Sciences, Gifu University (G-CHAIN), Gifu, Japan.
| |
Collapse
|
15
|
Islam MZ, Sawatari Y, Kojima S, Kiyama Y, Nakamura M, Sasaki K, Otsuka M, Obi T, Shiraishi M, Miyamoto A. Vasomotor effects of 5-hydroxytryptamine, histamine, angiotensin II, acetylcholine, noradrenaline, and bradykinin on the cerebral artery of bottlenose dolphin (Tursiops truncatus). J Vet Med Sci 2020; 82:1456-1463. [PMID: 32814751 PMCID: PMC7653325 DOI: 10.1292/jvms.20-0351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
From an evolutionary aspect, dolphins share a very close phylogenetic relationship with
pigs. Previously, we characterized porcine cerebral artery responsiveness to intrinsic
vasoactive substances. Therefore, here, we investigated dolphin (Tursiops
truncatus) cerebral artery responsiveness to 5-hydroxytryptamine (5-HT),
histamine (His), angiotensin (Ang) II, acetylcholine (ACh), noradrenaline (NA), and
bradykinin (BK) to characterize their related receptor subtypes. We also compared dolphin
cerebral artery responsiveness with porcine cerebral artery responsiveness. We found that
5-HT and His induced concentration-dependent contraction of the dolphin cerebral artery.
Ketanserin (a 5-HT2 antagonist) and methiothepin (a 5-HT1 and
5-HT2 antagonist) shifted the concentration-response curve for 5-HT to the
right. Although diphenhydramine (an H1 antagonist) shifted the
concentration-response curve for His to the right, cimetidine (an H2
antagonist) had no such effect. Ang II and ACh did not produce any vasomotor actions. NA
induced concentration-dependent relaxation. Propranolol (a β antagonist) shifted the
concentration-response curve for NA to the right, whereas phentolamine (an α antagonist)
had no significant effect. BK induced relaxation followed by contraction in pre-contracted
arteries with intact endothelium. HOE140 (a B2 antagonist) shifted the
concentration-response curve for BK to the right, whereas
des-Arg9-[Leu8]-BK (a B1 antagonist) had no significant
effect. These results suggest that 5-HT1, 5-HT2, and H1
receptor subtypes are important in arterial contraction and that β and B2
receptor subtypes modify these contractions to relaxations. The responsiveness of the
dolphin cerebral artery is very similar to that of porcine cerebral artery, supporting
their evolutionary linkage.
Collapse
Affiliation(s)
- Md Zahorul Islam
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.,Department of Pharmacology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
| | - Yuji Sawatari
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Shusuke Kojima
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Yusuke Kiyama
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Moe Nakamura
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Kyouko Sasaki
- Kagoshima Prefecture Meet Hygiene Inspection Center, 10-1 Kamoike-Shinmachi, Kagoshima 890-8577, Japan
| | - Mika Otsuka
- Kagoshima City Aquarium, 3-1 Honkou-Shinmachi, Kagoshima 892-0814, Japan
| | - Takeshi Obi
- Department of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
16
|
Sudo K, VAN Dao C, Miyamoto A, Shiraishi M. Comparative analysis of in vitro neurotoxicity of methylmercury, mercury, cadmium, and hydrogen peroxide on SH-SY5Y cells. J Vet Med Sci 2019; 81:828-837. [PMID: 30996207 PMCID: PMC6612504 DOI: 10.1292/jvms.19-0059] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Mercury (Hg) and cadmium (Cd) are the major toxic heavy metals and are known to induce
neurotoxicity. Although many studies have shown that several heavy metals have neurotoxic
effects, the cellular and molecular mechanisms thereof are still not clear. Oxidative
stress is reported to be a common and important mechanism in cytotoxicity induced by heavy
metals. However, the assays for identifying toxic mechanisms were not performed under the
same experimental conditions, making it difficult to compare toxic properties of the heavy
metals. In this study, we investigated the mechanisms underlying neurotoxicity induced by
heavy metals and H2O2, focusing on cell death, cell proliferation,
and oxidative stress under the same experimental condition. Our results showed that MeHg
caused lactate dehydrogenase (LDH) release, caspase activation and cell-cycle alteration,
and ROS generation in accordance with decreased cell viability. HgCl2 caused
LDH release and cell-cycle alteration, but not caspase activation. CdCl2 had a
remarkable effect on the cell cycle profiles without induction of LDH release, caspase
activation, or ROS generation. Pretreatment with N-acetyl-l-cysteine (NAC) prevented the
decrease in cell viability induced by MeHg and HgCl2, but not CdCl2.
Our results demonstrate a clear difference in neurotoxic mechanisms induced by MeHg,
HgCl2, CdCl2 or H2O2 in SH-SY5Y cells.
Elucidating the characteristics and mechanisms of each heavy metal under the same
experimental conditions will be helpful to understand the effect of heavy metals on health
and to develop a more effective therapy for heavy metal poisoning.
Collapse
Affiliation(s)
- Kasumi Sudo
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.,Present address: Assay Division I, National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Cuong VAN Dao
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.,Department of Veterinary Pharmacology, Faculty of Animal Husbandry and Veterinary Medicine, Thai Nguyen University of Agriculture and Forestry, Group 10, Quyet Thang Commune, Thai Nguyen City, Thai Nguyen, Vietnam
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
17
|
Imai N, Hotta M, Shiraishi M, Suzuki T. Physical therapy using by craniocervical oscillating mechanical stimulation for chronic migraine. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
|
18
|
Shiraishi M, Kawashima S, Moroi M, Shin Y, Morita T, Horii Y, Ikeda M, Ito K. A Defect in Collagen Receptor-Ca2+ Signaling System in Platelets from Cattle with Chediak-Higashi Syndrome. Thromb Haemost 2017. [DOI: 10.1055/s-0037-1612995] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
SummaryDecreased platelet aggregation to collagen is a cause for bleeding diathesis of Chediak-Higashi syndrome (CHS). We investigated whether the collagen receptor-Ca2+ signaling system was impaired in platelets from cattle affected with CHS. A collagen-induced increase in cytosolic Ca2+ ([Ca2+]i) was depressed in CHS platelets, which was accompanied by a decrease in the production of inositol 1,4,5-trisphosphate. When the influences of endogenous arachidonic acid metabolites and ADP were excluded, convulxin or collagen-related peptide, which are specific agonists for the collagen receptor GPVI, increased [Ca2+]i in both normal and CHS platelets. In contrast, rhodocytin, which was thought to activate another collagen receptor GPIa/IIa, increased [Ca2+]i in CHS platelets to a lesser extent than in normal ones. Cytochalasin D, an actin polymerization inhibitor, depressed the response to collagen or rhodocytin but not the response to convulxin. Adhesion of CHS platelets to acid soluble type I collagen, which was mediated by GPIa/IIa, was similar to that of normal platelets. These results suggest that a defect in the rhodocytin-sensitive pathway is responsible for decreasing the response to collagen in CHS platelets. It remains to be determined which receptor is associated with the mechanism.
Collapse
|
19
|
Dao CV, Shiraishi M, Miyamoto A. The MARCKS protein amount is differently regulated by calpain during toxic effects of methylmercury between SH-SY5Y and EA.hy926 cells. J Vet Med Sci 2017; 79:1931-1938. [PMID: 29046508 PMCID: PMC5745167 DOI: 10.1292/jvms.17-0473] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Methylmercury (MeHg) is an environmental pollutant that shows severe toxicity to humans and animals. However, the molecular mechanisms mediating MeHg toxicity are not completely understood. We have previously reported that the MARCKS protein is involved in the MeHg toxicity to SH-SY5Y neuroblastoma and EA.hy926 vascular endothelial cell lines. In addition, calpain, a Ca2+-dependent protease, is suggested to be associated with the MeHg toxicity. Because MARCKS is known as a substrate of calpain, we studied the relation between calpain activation and cleavage of MARCKS and its role in MeHg toxicity. In SH-SY5Y cells, MeHg decreased cell viability along with increased calcium mobilization, calpain activation and a decrease in MARCKS amounts. However, pretreatment with calpain inhibitors attenuated the decrease in cell viability and MARCKS amount induced only by 1 µM but not by 3 µM MeHg. In cells with a MARCKS knockdown, calpain inhibitors failed to attenuate the decrease in cell viability caused by MeHg. In EA.hy926 cells, although MeHg caused calcium mobilization and a decrease in MARCKS levels, calpain activation was not observed. These results indicate that the participation of calpain in the regulation of MARCKS amounts is dependent on the cell type and concentration of MeHg. In SH-SY5Y cells, calpain-mediated proteolysis of MARCKS is involved in cytotoxicity induced by a low concentration of MeHg.
Collapse
Affiliation(s)
- Cuong Van Dao
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.,Department of Veterinary Pharmacology, Faculty of Animal Husbandry and Veterinary Medicine, Thai Nguyen University of Agriculture and Forestry, Group 10, Quyet Thang Commune, Thai Nguyen City, Thai Nguyen, Vietnam
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
20
|
Mikami K, Shiraishi M, Kamo T. Subjective vertical position allows prediction of one year later forward flexion of trunk in Parkinson’s disease patient. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
21
|
Tanaka K, Shiraishi M, Uchino K, Akamatsu M, Hasegawa Y. Overnight accelerometric monitoring of inability to turn in bed in Parkinson’s disease and hemiplegic stroke. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
22
|
Shiraishi M, Murakami T, Takeda A. [PP.04.28] PEAK DP/DT IN DESCENDING AORTA IS DECREASED IN PATIENTS AFTER AORTIC ARCH REPAIR. J Hypertens 2017. [DOI: 10.1097/01.hjh.0000523298.17077.68] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
23
|
Zahorul Islam M, Kawaguchi H, Miura N, Miyoshi N, Yamazaki-Himeno E, Shiraishi M, Miyamoto A, Tanimoto A. Hypertension alters the endothelial-dependent biphasic response of bradykinin in isolated Microminipig basilar artery. Microvasc Res 2017; 114:52-57. [PMID: 28587989 DOI: 10.1016/j.mvr.2017.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 04/19/2017] [Accepted: 06/02/2017] [Indexed: 01/19/2023]
Abstract
Angiotensin (Ang) II is known to promote vascular disease and hypertension, partly through its effect on vascular endothelium. Bradykinin (BK) is an endothelium-dependent agonist that induces relaxation followed by contraction of the porcine basilar artery through release of NO and PGF2α, respectively. In this study, we evaluated the effect of Ang II-induced hypertension on basilar artery responsiveness to BK in the Microminipig (MMPig). Ang II (200ng/kg/min) or vehicle was infused into MMPigs for 14days using an osmotic mini-pump and blood pressure was monitored regularly. The responsiveness of subsequently isolated basilar arteries was then measured using a micro organ bath system. MMPig basilar artery endothelial cells were cultured and stimulated with Ang II or vehicle for 48h. Mean blood pressure was significantly (P<0.05; n=5) higher in Ang II-infused MMPigs than in vehicle-infused MMPigs. In vitro, BK-induced endothelium-dependent dilation of isolated basilar artery specimens was abolished and BK-induced contraction was significantly increased (Emax: 15.85±2.42% and 56.54±2.71% of 60mM KCl in control and Ang II group respectively at 10-7M concentration of BK; P<0.01; n=5) in Ang II-infused MMPigs. Ang II stimulation of the endothelial cells significantly decreased (54.15% at 24h; P<0.05; n=three independent experiment performed in triplicate) the amount of BK-elicited NO and increased (44.27% at 24h; P<0.05; n=three independent experiment performed in triplicate) the amount of BK-elicited PGF2α. These results suggest that the decrease of NO and increase of PGF2α production from endothelial cells are responsible for cerebrovascular dysfunction in hypertension, possibly causing cerebrovascular contraction and thus increasing the risk of brain infarction.
Collapse
Affiliation(s)
- Md Zahorul Islam
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Hiroaki Kawaguchi
- Department of Hygiene and Health Promotion Medicine, Graduate School of Medical and Dental Sciences, Kagoshima University, Japan
| | - Naoki Miura
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Noriaki Miyoshi
- Laboratory of Veterinary Histopathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Emi Yamazaki-Himeno
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan.
| | - Akihide Tanimoto
- Department of Pathology, Graduate School of Medical and Dental Science, Kagoshima University, Japan
| |
Collapse
|
24
|
Nguyen HTT, Nguyen HT, Islam MZ, Obi T, Pothinuch P, Nguyen TV, Nguyen TM, Dao CV, Shiraishi M, Miyamoto A. Antagonistic Effects ofGingko bilobaandSophora japonicaon Cerebral Vasoconstriction in Response to Histamine, 5-Hydroxytryptamine, U46619 and Bradykinin. Am J Chin Med 2016; 44:1607-1625. [DOI: 10.1142/s0192415x16500907] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this study was to evaluate, for the first time, the antagonistic effects of Gingko biloba leaf (GB) and Sophora japonica L. flower bud (SJ) extracts on cerebral vasoconstriction in response to KCl, extracellular Ca[Formula: see text], histamine, 5-hydroxytryptamine (5-HT), 9,11-dideoxy-9[Formula: see text],11[Formula: see text]-methanoepoxy prostaglandin (PG) F[Formula: see text](U46619) and bradykinin (BK), in order to explain their traditional application for diseases associated with cerebral vasospasm. Isolated porcine basilar arteries (PBA) and endothelial cells from them were used as the study materials. Neither SJ nor GB had any effect on the contractions induced by KCl and extracellular Ca[Formula: see text]. SJ significantly inhibited the contraction induced by histamine, 5-HT, U46619 and BK, whereas GB inhibited histamine-induced contraction, but had no effects on the contractions induced by 5-HT, U46619 and BK. In the presence of diphenhydramine (a H1receptor antagonist), ketanserin (a 5-HT2receptor antagonist) and ONO-3708 (a thromboxane (TX) A2/PG receptor antagonist), the inhibitory effects of these extracts on the contractions induced by histamine, 5-HT and U46619 were abolished. SJ significantly inhibited the contractions induced by BK and PGF[Formula: see text], but in the presence of ONO-3708 (10[Formula: see text] M) had no effect on them. BK enhanced the production of PGF[Formula: see text] from cultured PBA endothelium cells, and SJ significantly attenuated this enhancement. These results suggest that SJ and GB have a H1-antagonistic effect, and that SJ also attenuates cerebral vasoconstriction mediated via 5-HT2and TXA2/PG receptors. These findings appear to explain why SJ has been used traditionally as a therapeutic medication for cerebral vasospasm after cerebral hemorrhage.
Collapse
Affiliation(s)
- Ha Thi Thanh Nguyen
- Department of Veterinary Pharmacology, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Hai Thanh Nguyen
- Department of Plant Bio-Technology, Faculty of Biotechnology, Vietnam National University of Agriculture, Trau Quy Crossing, Gia Lam District, Hanoi, Vietnam
| | - Md. Zahorul Islam
- Department of Veterinary Pharmacology, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Takeshi Obi
- Department of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Pitchaya Pothinuch
- Department of Veterinary Surgery and Reproduction, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy Crossing, Gia Lam District, Hanoi, Vietnam
| | - Thanh Van Nguyen
- Department of Food Science and Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok, Thailand
| | - Tuong Manh Nguyen
- Department of Internal Medicine and Pharmacology Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy Crossing, Gia Lam District, Hanoi, Vietnam
| | - Cuong Van Dao
- Department of Veterinary Pharmacology, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
25
|
VAN Dao C, Islam MZ, Sudo K, Shiraishi M, Miyamoto A. MARCKS is involved in methylmercury-induced decrease in cell viability and nitric oxide production in EA.hy926 cells. J Vet Med Sci 2016; 78:1569-1576. [PMID: 27349763 PMCID: PMC5095626 DOI: 10.1292/jvms.16-0249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Methylmercury (MeHg) is a persistent environmental contaminant that has been reported worldwide. MeHg exposure has been reported to lead to increased risk of cardiovascular diseases; however, the mechanisms underlying the toxic effects of MeHg on the cardiovascular system have not been well elucidated. We have previously reported that mice exposed to MeHg had increased blood pressure along with impaired endothelium-dependent vasodilation. In this study, we investigated the toxic effects of MeHg on a human endothelial cell line, EA.hy926. In addition, we have tried to elucidate the role of myristoylated alanine-rich C kinase substrate (MARCKS) in the MeHg toxicity mechanism in EA.hy926 cells. Cells exposed to MeHg (0.1-10 µM) for 24 hr showed decreased cell viability in a dose-dependent manner. Treatment with submaximal concentrations of MeHg decreased cell migration in the wound healing assay, tube formation on Matrigel and spontaneous nitric oxide (NO) production of EA.hy926 cells. MeHg exposure also elicited a decrease in MARCKS expression and an increase in MARCKS phosphorylation. MARCKS knockdown or MARCKS overexpression in EA.hy926 cells altered not only cell functions, such as migration, tube formation and NO production, but also MeHg-induced decrease in cell viability and NO production. These results suggest the broad role played by MARCKS in endothelial cell functions and the involvement of MARCKS in MeHg-induced toxicity.
Collapse
Affiliation(s)
- Cuong VAN Dao
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | | | | | | | | |
Collapse
|
26
|
Nguyen HTT, Nguyen HT, Islam MZ, Obi T, Pothinuch P, Zar PPK, Hou DX, Van Nguyen T, Nguyen TM, Van Dao C, Shiraishi M, Miyamoto A. Pharmacological characteristics of Artemisia vulgaris L. in isolated porcine basilar artery. J Ethnopharmacol 2016; 182:16-26. [PMID: 26875644 DOI: 10.1016/j.jep.2016.02.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 02/04/2016] [Accepted: 02/07/2016] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE In Vietnamese traditional herbalism, there are conflicting opinions about the effect of Artemisia vulgaris L. (AVL, English name: mugwort) on hypertension. Some ethnic doctors recommend the use of AVL for treatment of hypertension, whereas others advise against it. The purpose of this study was to clarify the pharmacological characteristics of AVL in isolated arteries to explain the conflicts surrounding the use of AVL for treatment of hypertension. MATERIALS AND METHODS We initially performed a functional study using an organ bath system to investigate the effect of AVL extract on isolated porcine basilar artery. We then measured the change in intracellular free Ca(2+) concentration elicited by AVL using cultured smooth muscle cells loaded with the Ca(2+) indicator fluo-4. Finally, using HPLC, we determined the active components in AVL. RESULTS AND DISCUSSION AVL induced vasoconstriction at resting tension, and endothelial removal enhanced this effect significantly. Pretreatment with PD123319 (an AT2 receptor antagonist), Nω-nitro-L-arginine (a nitric oxide synthase inhibitor), or both, also enhanced this effect. AVL-induced contraction was competitively inhibited by methiothepin (a 5-HT1 and 5-HT2 receptor antagonist) in the presence of ketanserin (a 5-HT2 receptor antagonist). Removal of extracellular calcium with nifedipine (an L-type Ca(2+) channel blocker) or ruthenium red (a ryanodine receptor blocker) significantly reduced AVL-induced contraction, whereas losartan (an AT1 receptor antagonist) and diphenhydramine (a H1 receptor antagonist) had no effect on this contraction. AVL increased the intracellular free Ca(2+) concentration in cultured cells, and this increment was inhibited by methiothepin. HPLC analysis revealed that the retention time of the first peak in the AVL profile was similar to that of the 5-HT standard, and that addition of 5-HT to the AVL sample enhanced this peak. On the other hand, AVL induced endothelium-independent relaxation under precontracted conditions with 60mM KCl. Captopril (an angiotensin converting enzyme inhibitor), atenolol (a β1 receptor antagonist) and cimetidine (a H2 receptor antagonist) had no effect on this relaxation. In Ca(2+)-free 60mM KCl-containing solution, pretreatment with AVL significantly inhibited CaCl2-induced contraction. CONCLUSION For the first time, the present study has demonstrated that AVL has two opposite effects, contraction and relaxation, on isolated artery, which may help to explain the conflicting indications for AVL in traditional herbalism. 5-HT is a significant factor affecting artery contraction in the presence of AVL.
Collapse
Affiliation(s)
- Ha Thi Thanh Nguyen
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Hai Thanh Nguyen
- Department of Plant Bio-technology, Faculty of Biotechnology, Vietnam National University of Agriculture, Trau Quy crossing, Gia Lam district, Hanoi, Vietnam
| | - Md Zahorul Islam
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Takeshi Obi
- Department of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Pitchaya Pothinuch
- Department of Food Science and Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok, Thailand
| | - Phyu Phyu Khine Zar
- Department of Biochemical Science and Technology, Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - De Xing Hou
- Department of Biochemical Science and Technology, Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Thanh Van Nguyen
- Department of Veterinary Surgery and Reproduction, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy crossing, Gia Lam district, Hanoi, Vietnam
| | - Tuong Manh Nguyen
- Department of Internal Medicine and Pharmacology, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Trau Quy crossing, Gia Lam district, Hanoi, Vietnam
| | - Cuong Van Dao
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
| |
Collapse
|
27
|
Dushenko S, Ago H, Kawahara K, Tsuda T, Kuwabata S, Takenobu T, Shinjo T, Ando Y, Shiraishi M. Gate-Tunable Spin-Charge Conversion and the Role of Spin-Orbit Interaction in Graphene. Phys Rev Lett 2016; 116:166102. [PMID: 27152812 DOI: 10.1103/physrevlett.116.166102] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Indexed: 05/22/2023]
Abstract
The small spin-orbit interaction of carbon atoms in graphene promises a long spin diffusion length and the potential to create a spin field-effect transistor. However, for this reason, graphene was largely overlooked as a possible spin-charge conversion material. We report electric gate tuning of the spin-charge conversion voltage signal in single-layer graphene. Using spin pumping from an yttrium iron garnet ferrimagnetic insulator and ionic liquid top gate, we determined that the inverse spin Hall effect is the dominant spin-charge conversion mechanism in single-layer graphene. From the gate dependence of the electromotive force we showed the dominance of the intrinsic over Rashba spin-orbit interaction, a long-standing question in graphene research.
Collapse
Affiliation(s)
- S Dushenko
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - H Ago
- Institute for Material Chemistry and Engineering, Kyushu University, Fukuoka 816-8508, Japan
| | - K Kawahara
- Institute for Material Chemistry and Engineering, Kyushu University, Fukuoka 816-8508, Japan
| | - T Tsuda
- Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
| | - S Kuwabata
- Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
| | - T Takenobu
- School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - T Shinjo
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Y Ando
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - M Shiraishi
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| |
Collapse
|
28
|
Ohkubo M, Miyamoto A, Shiraishi M. Heavy metal chelator TPEN attenuates fura-2 fluorescence changes induced by cadmium, mercury and methylmercury. J Vet Med Sci 2016; 78:761-7. [PMID: 26781706 PMCID: PMC4905828 DOI: 10.1292/jvms.15-0620] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Stimulation with heavy metals is known to induce calcium (Ca2+)
mobilization in many cell types. Interference with the measurement of intracellular
Ca2+ concentration by the heavy metals in cells loaded with Ca2+
indicator fura-2 is an ongoing problem. In this study, we analyzed the effect of heavy
metals on the fura-2 fluorescence ratio in human SH-SY5Y neuroblastoma cells by using
TPEN, a specific cell-permeable heavy metal chelator. Manganese chloride (30–300
µM) did not cause significant changes in the fura-2 fluorescence ratio.
A high concentration (300 µM) of lead acetate induced a slight elevation
in the fura-2 fluorescence ratio. In contrast, stimulation with cadmium chloride, mercury
chloride or MeHg (3–30 µM) elicited an apparent elevation of the fura-2
fluorescence ratio in a dose-dependent manner. In cells stimulated with 10 or 30
µM cadmium chloride, the addition of TPEN decreased the elevated fura-2
fluorescence ratio to basal levels. In cells stimulated with mercury or MeHg, the addition
of TPEN significantly decreased the elevation of the fura-2 fluorescence ratio induced by
lower concentrations (10 µM) of mercury or MeHg, but not by higher
concentrations (30 µM). Pretreatment with Ca2+ channel
blockers, such as verapamil, 2-APB or lanthanum chloride, resulted in different effects on
the fura-2 fluorescence ratio. Our study provides a characterization of the effects of
several heavy metals on the mobilization of divalent cations and the toxicity of heavy
metals to neuronal cells.
Collapse
Affiliation(s)
- Masato Ohkubo
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | | | | |
Collapse
|
29
|
Hatano A, Shiraishi M, Terado N, Tanabe A, Fukuda K. Enzymatic synthesis and RNA interference of nucleosides incorporating stable isotopes into a base moiety. Bioorg Med Chem 2015; 23:6683-8. [PMID: 26404411 DOI: 10.1016/j.bmc.2015.09.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/03/2015] [Accepted: 09/04/2015] [Indexed: 11/25/2022]
Abstract
Thymidine phosphorylase was used to catalyze the conversion of thymidine (or methyluridine) and uracil incorporating stable isotopes to deoxyuridine (or uridine) with the uracil base incorporating the stable isotope. These base-exchange reactions proceeded with high conversion rates (75-96%), and the isolated yields were also good (64-87%). The masses of all synthetic compounds incorporating stable isotopes were identical to the theoretical molecular weights via EIMS. (13)C NMR spectra showed spin-spin coupling between (13)C and (15)N in the synthetic compounds, and the signals were split, further proving incorporation of the isotopes into the compounds. The RNA interference effects of this siRNA with uridine incorporating stable isotopes were also investigated. A 25mer siRNA had a strong knockdown effect on the MARCKS protein. The insertion position and number of uridine moieties incorporating stable isotopes introduced into the siRNA had no influence on the silencing of the target protein. This incorporation of stable isotopes into RNA and DNA has the potential to function as a chemically benign tracer in cells.
Collapse
Affiliation(s)
- Akihiko Hatano
- Department of Chemistry, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan.
| | - Mitsuya Shiraishi
- Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Nanae Terado
- Department of Chemistry, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan
| | - Atsuhiro Tanabe
- Department of Chemistry, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan
| | - Kenji Fukuda
- Taiyo Nippon Sanso Corp., 10 Okubo, Tsukuba-shi, Ibaragi 300-2611, Japan
| |
Collapse
|
30
|
Dushenko S, Koike M, Ando Y, Shinjo T, Myronov M, Shiraishi M. Experimental Demonstration of Room-Temperature Spin Transport in n-Type Germanium Epilayers. Phys Rev Lett 2015; 114:196602. [PMID: 26024188 DOI: 10.1103/physrevlett.114.196602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Indexed: 06/04/2023]
Abstract
We report an experimental demonstration of room-temperature spin transport in n-type Ge epilayers grown on a Si(001) substrate. By utilizing spin pumping under ferromagnetic resonance, which inherently endows a spin battery function for semiconductors connected with a ferromagnet, a pure spin current is generated in the n-Ge at room temperature. The pure spin current is detected by using the inverse spin-Hall effect of either a Pt or Pd electrode on n-Ge. From a theoretical model that includes a geometrical contribution, the spin diffusion length in n-Ge at room temperature is estimated to be 660 nm. Moreover, the spin relaxation time decreases with increasing temperature, in agreement with a recently proposed theory of donor-driven spin relaxation in multivalley semiconductors.
Collapse
Affiliation(s)
- S Dushenko
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - M Koike
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Y Ando
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - T Shinjo
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - M Myronov
- Department of Physics, The University of Warwick, Coventry CV47AL, United Kingdom
| | - M Shiraishi
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| |
Collapse
|
31
|
Hashiguchi Y, Lee JM, Shiraishi M, Komatsu S, Miki S, Shimasaki Y, Mochioka N, Kusakabe T, Oshima Y. Characterization and evolutionary analysis of tributyltin-binding protein and pufferfish saxitoxin and tetrodotoxin-binding protein genes in toxic and nontoxic pufferfishes. J Evol Biol 2015; 28:1103-18. [PMID: 25847490 DOI: 10.1111/jeb.12634] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 03/29/2015] [Indexed: 12/20/2022]
Abstract
Understanding the evolutionary mechanisms of toxin accumulation in pufferfishes has been long-standing problem in toxicology and evolutionary biology. Pufferfish saxitoxin and tetrodotoxin-binding protein (PSTBP) is involved in the transport and accumulation of tetrodotoxin and is one of the most intriguing proteins related to the toxicity of pufferfishes. PSTBPs are fusion proteins consisting of two tandem repeated tributyltin-binding protein type 2 (TBT-bp2) domains. In this study, we examined the evolutionary dynamics of TBT-bp2 and PSTBP genes to understand the evolution of toxin accumulation in pufferfishes. Database searches and/or PCR-based cDNA cloning in nine pufferfish species (6 toxic and 3 nontoxic) revealed that all species possessed one or more TBT-bp2 genes, but PSTBP genes were found only in 5 toxic species belonging to genus Takifugu. These toxic Takifugu species possessed two or three copies of PSTBP genes. Phylogenetic analysis of TBT-bp2 and PSTBP genes suggested that PSTBPs evolved in the common ancestor of Takifugu species by repeated duplications and fusions of TBT-bp2 genes. In addition, a detailed comparison of Takifugu TBT-bp2 and PSTBP gene sequences detected a signature of positive selection under the pressure of gene conversion. The complicated evolutionary dynamics of TBT-bp2 and PSTBP genes may reflect the diversity of toxicity in pufferfishes.
Collapse
Affiliation(s)
- Y Hashiguchi
- Department of Biology, Osaka Medical College, Takatsuki, Osaka, Japan
| | - J M Lee
- Laboratory of Silkworm Science, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - M Shiraishi
- Laboratory of Marine Environmental Science, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - S Komatsu
- Laboratory of Marine Environmental Science, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - S Miki
- Laboratory of Marine Environmental Science, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - Y Shimasaki
- Laboratory of Marine Environmental Science, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - N Mochioka
- Laboratory of Bioresource Sciences, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - T Kusakabe
- Laboratory of Silkworm Science, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - Y Oshima
- Laboratory of Marine Environmental Science, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| |
Collapse
|
32
|
Islam MZ, Watanabe Y, Nguyen HTT, Yamazaki-Himeno E, Obi T, Shiraishi M, Miyamoto A. Vasomotor effects of acetylcholine, bradykinin, noradrenaline, 5-hydroxytryptamine, histamine and angiotensin II on the mouse basilar artery. J Vet Med Sci 2014; 76:1339-45. [PMID: 24942113 PMCID: PMC4221166 DOI: 10.1292/jvms.14-0223] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We investigated the responsiveness of the mouse basilar artery to acetylcholine (ACh), bradykinin (BK), noradrenaline (NA), 5-hydroxytryptamine (5-HT), histamine (His) and angiotensin (Ang) II in order to characterize the related receptor subtypes in vitro. ACh and BK induced endothelium-dependent relaxation of precontracted arteries with U-46619 (a thromboxane A2 analogue). Atropine (a non-selective muscarinic receptor antagonist) and Nω-nitro-L-arginine (a NO synthase inhibitor, L-NNA) shifted the concentration-response curve for ACh to the right, whereas pirenzepine, methoctramine and pFHHSiD (muscarinic M1, M2 and M3 antagonists, respectively) had no significant effect. L-NNA and HOE140 (a B2 antagonist) shifted the concentration-response curve for BK to the right, whereas des-Arg(9)-[Leu(8)]-BK (a B1 antagonist) and indomethacin (a cyclooxygenase inhibitor) had no significant effect. NA failed to produce any vasomotor action. His and Ang II induced concentration-dependent contraction. Diphenhydramine (a H1 antagonist) shifted the concentration-response curve for His to the right, whereas cimetidine (a H2 antagonist) had no significant effect. Losartan (an AT1 antagonist) shifted the concentration-response curve for Ang II to the right, whereas PD123319 (an AT2 antagonist) had no significant effect. These results suggest that the H1 and AT1 receptor subtypes might play an important role in arterial contraction, whereas muscarinic receptor subtypes apart from M1, M2 and M3, and B2 receptors on the endothelium, might modify these contractions to relaxations.
Collapse
Affiliation(s)
- Md Zahorul Islam
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | | | | | | | | | | | | |
Collapse
|
33
|
Harada T, Yoshida Y, Kitasato Y, Tsuruta N, Wakamatsu K, Hirota T, Tanaka M, Tashiro N, Ishii H, Shiraishi M, Fujita M, Nagata N, Watanabe K. The thoracic cage becomes flattened in the progression of pleuroparenchymal fibroelastosis. Eur Respir Rev 2014; 23:263-6. [PMID: 24881083 PMCID: PMC9487577 DOI: 10.1183/09059180.00006713] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
34
|
Shiraishi M, Hangai M, Yamamoto M, Sasaki M, Tanabe A, Sasaki Y, Miyamoto A. Alteration in MARCKS phosphorylation and expression by methylmercury in SH-SY5Y cells and rat brain. Environ Toxicol Pharmacol 2014; 37:1256-1263. [PMID: 24835554 DOI: 10.1016/j.etap.2014.04.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 03/27/2014] [Accepted: 04/21/2014] [Indexed: 06/03/2023]
Abstract
The molecular mechanisms mediating methylmercury (MeHg)-induced neurotoxicity are not completely understood. Because myristoylated alanine-rich C kinase substrate (MARCKS) plays an essential role in the differentiation and development of neuronal cells, we studied the alteration of MARCKS expression and phosphorylation in MeHg-induced neurotoxicity of neuroblastoma SH-SY5Y cells and in the rat brain. Exposure to MeHg induced a decrease in cell viability of SH-SY5Y cells, which was accompanied by a significant increase in phosphorylation and a reduction in MARCKS expression. Pretreatment of cells with a protein kinase C inhibitor or an extracellular Ca(2+) chelator suppressed MeHg-induced MARCKS phosphorylation. In MARCKS knock-down cells, MeHg-induced cell death was significantly augmented in comparison to control siRNA. In brain tissue from MeHg-treated rats, MARCKS phosphorylation was enhanced in the olfactory bulb in comparison to control rats. The present study may indicate that alteration in MARCKS expression or phosphorylation has consequences for MeHg-induced neurotoxicity.
Collapse
Affiliation(s)
- Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
| | - Makoto Hangai
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Megumi Yamamoto
- Department of Basic Medical Sciences, National Institute for Minamata Disease, 4058-18 Hama, Minamata, Kumamoto 867-0008, Japan
| | - Masanori Sasaki
- Department of Basic Medical Sciences, National Institute for Minamata Disease, 4058-18 Hama, Minamata, Kumamoto 867-0008, Japan
| | - Atsuhiro Tanabe
- Department of Bioscience and Engineering, College of Systems Engineering and Science, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan
| | - Yasuharu Sasaki
- Laboratory of Pharmacology, School of Pharmaceutical Science, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Atsushi Miyamoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| |
Collapse
|
35
|
Shiraishi M, Tamura K, Egoshi M, Miyamoto A. Cholesterol enrichment of rabbit platelets enhances the Ca(2+) entry pathway induced by platelet-derived secondary feedback agonists. Life Sci 2013; 92:838-44. [PMID: 23499558 DOI: 10.1016/j.lfs.2013.02.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Revised: 02/18/2013] [Accepted: 02/25/2013] [Indexed: 01/15/2023]
Abstract
AIMS Hypersensitivity of platelets due to increased platelet cholesterol levels has been reported in hypercholesterolemia. However, the signaling pathways linking increased platelet reactivity and cholesterol contents are not fully understood. This study aims to determine the direct effect of cholesterol enrichment of platelets on the pathways including Ca(2+) mobilization and secondary feedback agonists such as adenosine diphosphate (ADP) and thromboxane A2 (TXA2). MAIN METHODS In vitro cholesterol enrichment of rabbit platelets was performed by incubation with cholesterol complexed with methyl-β-cyclodextrin. Ca(2+) mobilization was monitored using platelets loaded with fura-PE3/AM, a fluorescent calcium indicator. Released ATP and TXB2 from platelets were measured by a luciferin-luciferase ATP assay system and a TXB2 ELISA Kit, respectively. KEY FINDINGS Cholesterol enrichment of rabbit platelets significantly enhanced Ca(2+) mobilization induced by thrombin, accompanying an augmented Ca(2+) entry. The augmentation of Ca(2+) entry by cholesterol enrichment was significantly suppressed by treatment with inhibitors for secondary feedback agonists. In cholesterol-enriched platelets, the amount of released ATP or TXB2 induced by thrombin was not significantly altered in comparison with control platelets, whereas an increase in [Ca(2+)]i induced by ADP or U46619, a TXA2 mimetic, was significantly enhanced. SIGNIFICANCE These results suggest that cholesterol enrichment of rabbit platelets results in enhanced Ca(2+) mobilization via ADP/TXA2-dependent augmentation of the Ca(2+) entry pathway. The results reveal a novel mechanism by which platelet hypersensitivity is regulated by cholesterol contents.
Collapse
Affiliation(s)
- Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | | | | | | |
Collapse
|
36
|
Yamamoto M, Takeya M, Ikeshima-Kataoka H, Yasui M, Kawasaki Y, Shiraishi M, Majima E, Shiraishi S, Uezono Y, Sasaki M, Eto K. Increased expression of aquaporin-4 with methylmercury exposure in the brain of the common marmoset. J Toxicol Sci 2012; 37:749-63. [PMID: 22863855 DOI: 10.2131/jts.37.749] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The relationship between methylmercury (MeHg) exposure and aquaporin (AQP) expression in the brain is currently unknown. To investigate this, we used a common marmoset model of acute MeHg exposure to examine AQP1, AQP4 and AQP11 gene expression. MeHg (1.5 mg Hg/kg/day p.o.) was given to three marmosets for 14 days, followed by 14 days without. All treated marmosets showed slight akinesia before sacrifice. In the frontal lobe, occipital lobe and cerebellum, total mercury concentrations following MeHg administration were 26.7, 31.4, and 22.6 µg/g, respectively. Slight apoptosis was observed in the occipital lobe. Immunohistochemistry showed increased expression of glial fibrillary acidic protein, its mRNA and Iba1 with MeHg, indicating that neuronal injury activated astrocytes and microglia. There was no significant difference between control and MeHg-administered groups in AQP1 protein or AQP11 mRNA in the frontal lobe, occipital lobe or cerebellum. The ratio of AQP4 mRNA expression in MeHg-administered marmosets to the mean AQR4 expression in the controls (n = 3) were 1.3, 1.5 and 1.2, 1.7, 1.9 and 1.5, and 1.5, 1.6 and 1.2 for the frontal lobe, occipital lobe and cerebellum, respectively. Western blotting showed significantly increased AQP4 protein in the occipital lobe and cerebellum with MeHg administration, but no obvious up-regulation in the frontal lobe. Immunofluorescence analysis with double staining revealed low AQP4 expression in the cell body of reactive astrocytes in the MeHg-administered group. These results indicate that AQP4 expression might be stimulated by MeHg exposure in astrocytes in the occipital lobe and cerebellum, suggesting a role for AQP4 in MeHg neurotoxicity via astrocyte dysfunction.
Collapse
Affiliation(s)
- Megumi Yamamoto
- Department of Basic Medical Sciences, National Institute for Minamata Disease, Kumamoto, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Masuda T, Sadoyama T, Shiraishi M. Dependence of average muscle fibre conduction velocity on voluntary contraction force. J Electromyogr Kinesiol 2012; 6:267-76. [PMID: 20719684 DOI: 10.1016/s1050-6411(96)00022-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/1995] [Revised: 04/25/1996] [Accepted: 05/18/1996] [Indexed: 10/18/2022] Open
Abstract
Average muscle fibre conduction velocity (CV) measured with multichannel surface electrodes decreases with time during sustained isometric contraction. Based on this property, CV is considered a candidate for an objective index to localized muscular fatigue. CV, however, also depends on many other factors that include muscle temperature and voluntary contraction force. In this paper, the effect of contraction force on CV was studied by defining not only the target force level but also the whole force trajectory. The contraction was isometric and lasted 14 s. The target force was set at four levels from 30% to 90% of the maximal voluntary contraction (MVC). Three typical muscles were studied in seven healthy male subjects. In the vastus lateralis, CV increased with contraction force in many cases. In the biceps brachii, CV decreased rapidly with time before the contraction force reached the target levels of 70% or 90% MVC. At these force levels, CV was smaller than that at 50% MVC. CV in the biceps consequently showed no apparent dependence on the contraction force. The tibialis anterior showed intermediate change in CV between the vastus lateralis and the biceps brachii. These results indicate that CV basically increases with contraction force, but this relationship becomes unclear when CV decreases rapidly with time.
Collapse
Affiliation(s)
- T Masuda
- Human Informatics Department, National Institute of Bioscience and Human-Technology, Higashi 1-1, Tsukuba, Ibaraki 305, Japan
| | | | | |
Collapse
|
38
|
Shiraishi M, Suzuki K, Abe T, Kikuchi T, Satoh H, Nakaji S, Sugawara K. Diurnal variation in neutrophil function. Environ Health Prev Med 2012; 1:65-70. [PMID: 21432424 DOI: 10.1007/bf02931192] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/1995] [Accepted: 01/16/1996] [Indexed: 11/25/2022] Open
Abstract
Neutrophil functions, including chemotaxis, reactive oxygen species (ROS)-producing capacity of neutrophils, and serum opsonic activity were investigated in 9 young healthy male volunteers. Venous blood of these volunteers was obtained under standardized conditions at 4-h intervals over a 24-h span. Neutrophil chemotaxis was evaluated by a modified Boyden technique, ROS-producing capacity of neutrophils and serum opsonic activity were measured by a simultaneous multiple measurement system based on luminol-dependent chemiluminescence and indicated by peak height and peak time. ROS-producing capacity of neutrophils and serum opsonic activity were activated in the daytime, and decreased from night to morning. There were negative correlations between the peak time of the luminol-dependent chemiluminescent response, neutrophil number (p<0.01) and segmented neutrophil number (p>0.01). On the other hand, no significant correlations were noted between serum opsonic activity and IgG, IgA, IgM, C3 or C4. In contrast, the peaks of neutrophil chemotaxis were at the wake-up time (6:00a.m.) and in the evening (6:00p.m.). This study indicates that diurnal variation of neutrophil function exists.
Collapse
Affiliation(s)
- M Shiraishi
- Department of Hygiene, Hirosaki University School of Medicine, 5 Zaifu-cho, 036, Hirosaki, Japan
| | | | | | | | | | | | | |
Collapse
|
39
|
Murakami N, Takeshita E, Oto Y, Itabashi H, Shiraishi M, Kudo K, Nagai T. G.P.47 Congenital generalized lipodystrophy type 4 with muscular dystrophy: Clinical manifestations in early childhood. Neuromuscul Disord 2012. [DOI: 10.1016/j.nmd.2012.06.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
40
|
Yamatoya H, Kawaguchi H, Yajima K, Kadokura H, Yoshikawa T, Yamashita R, Shiraishi M, Miyamoto A, Miyoshi N. Data on Wistar Hannover rats from a general toxicity study. Exp Anim 2012; 61:467-76. [PMID: 22850647 DOI: 10.1538/expanim.61.467] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The aim of this study was to collect data on chronological changes in clinical laboratory tests, pathological examinations, and hepatic drug-metabolizing enzymes from Wistar Hannover rats at 8, 10, 19, and 32 weeks of age. The serum triglyceride concentration and the serum LDL cholesterol level were higher in males than in females at all ages. In contrast, serum total protein and creatinine concentrations and cholinesterase activity were lower in males than in females. In addition, sex differences were confirmed in pituitary weight and hepatic CYP3A2 and CYP2C11 activities. In conclusion, the general toxicological data noted in clinical laboratory tests, pathological examinations, and hepatic drug-metabolizing enzymes relating to chronological changes and sex differences may be useful in assessing drug-related toxicity in this strain.
Collapse
Affiliation(s)
- Hideyuki Yamatoya
- The United Graduate School of Veterinary Science, Yamaguchi University, 1677–1 Yoshida, Yamaguchi 753-8515, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Yamatoya H, Kawaguchi H, Fukuda T, Kadokura H, Yamashita R, Yoshikawa T, Shiraishi M, Miyamoto A, Miyoshi N. Data on Wistar Hannover rats from an immunotoxicity study. Exp Anim 2012; 61:171-5. [PMID: 22531733 DOI: 10.1538/expanim.61.171] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The aim of this study was to collect data on immunological parameters from Wistar Hannover rats at 8, 10, 19, and 32 weeks of age. Low leukocyte parameter cell counts, serum globulin concentration, and T, B, and NK lymphocyte counts in peripheral blood at each time point; low T, B, and NK splenocyte counts; and high, or tendencies toward high, thymocyte counts at 10 weeks of age were noted in females when compared with males. KLH-specific antibody production increased gradually with age in both sexes. The immunological data noted for leukocyte parameters, the serum globulin concentration, and immunophenotyping (peripheral blood, spleen, and thymus) relating to chronological changes and sex differences may be useful in assessing drug-related immunotoxicity in this strain.
Collapse
Affiliation(s)
- Hideyuki Yamatoya
- The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Matsumoto F, Watanabe Y, Obi T, Islam MZ, Yamazaki-Himeno E, Shiraishi M, Miyamoto A. Characterization of 5-hydroxytryptamine-induced contraction and acetylcholine-induced relaxation in isolated chicken basilar artery. Poult Sci 2012; 91:1158-64. [PMID: 22499874 DOI: 10.3382/ps.2011-01945] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The aim of the present study was to clarify the responsiveness of the chicken basilar artery to 5-hydroxytryptamine (5-HT) and acetylcholine (ACh) and to characterize the related receptor subtypes in vitro. Basilar arteries were obtained from freshly slaughtered broiler chickens. The 5-HT induced concentration-dependent contraction of the arteries. The concentration-response curves for 5-HT were shifted 30-fold to the right by methiothepin (a 5-HT(1) and 5-HT(2) receptor antagonist) and 3-fold to the right by ketanserin (a 5-HT(2) receptor antagonist). In the presence of ketanserin, the concentration-response curve for 5-HT was shifted 10-fold to the right by methiothepin. The pA(2) value for methiothepin was 8.26. The ACh induced concentration-dependent relaxation under conditions of precontraction by 5-HT. The concentration-response curve for ACh was shifted to the right by atropine [a nonselective muscarinic (M) receptor antagonist] and hexahydro-sila-difenidol hydrochloride, a p-fluoroanalog (pFHHSiD, an M(3) receptor antagonist), but not by pirenzepine (an M(1) receptor antagonist) or methoctramine (an M(2) receptor antagonist). The pA(2) value for pFHHSiD was 7.55. Nω-Nitro-l-arginine (a nitric oxide synthase inhibitor) inhibited ACh-induced relaxation by approximately 50%. These results suggest that 5-HT induces contraction via activation of 5-HT(1) and 5-HT(2) receptors and that ACh induces relaxation via activation of the M(3) receptor. The 5-HT(1) receptor might play a dominant role in 5-HT-induced contraction. One of the factors involved in ACh-induced relaxation is probably nitric oxide released from endothelial cells.
Collapse
Affiliation(s)
- F Matsumoto
- Department of Veterinary Pharmacology, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | | | | | | | | | | | | |
Collapse
|
43
|
Tanabe A, Shiraishi M, Negishi M, Saito N, Tanabe M, Sasaki Y. MARCKS dephosphorylation is involved in bradykinin-induced neurite outgrowth in neuroblastoma SH-SY5Y cells. J Cell Physiol 2012; 227:618-29. [PMID: 21448919 DOI: 10.1002/jcp.22763] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Bradykinin (BK) plays a major role in producing peripheral sensitization in response to peripheral inflammation and in pain transmission in the central nerve system (CNS). Because BK activates protein kinase C (PKC) through phospholipase C (PLC)-β and myristoylated alanine-rich C kinase substrate (MARCKS) has been found to be a substrate of PKC, we explored the possibility that BK could induce MARCKS phosphorylation and regulate its function. BK stimulation induced transient MARCKS phosphorylation on Ser159 with a peak at 1 min in human neuroblastoma SH-SY5Y cells. By contrast, PKC activation by the phorbol ester phorbol 12,13-dibutyrate (PDBu) elicited MARCKS phosphorylation which lasted more than 10 min. Western blotting analyses and glutathione S-transferase (GST) pull-down analyses showed that the phosphorylation by BK was the result of activation of the PKC-dependent RhoA/Rho-associated coiled-coil kinase (ROCK) pathway. Protein phosphatase (PP) 2A inhibitors calyculin A and fostriecin inhibited the dephosphorylation of MARCKS after BK-induced phosphorylation. Moreover, immunoprecipitation analyses showed that PP2A interacts with MARCKS. These results indicated that PP2A is the dominant PP of MARCKS after BK stimulation. We established SH-SY5Y cell lines expressing wild-type MARCKS and unphosphorylatable MARCKS, and cell morphology changes after cell stimulation were studied. PDBu induced lamellipodia formation on the neuroblastoma cell line SH-SY5Y and the morphology was sustained, whereas BK induced neurite outgrowth of the cells via lamellipodia-like actin accumulation that depended on transient MARCKS phosphorylation. Thus these findings show a novel BK signal cascade-that is, BK promotes neurite outgrowth through transient MARCKS phosphorylation involving the PKC-dependent RhoA/ROCK pathway and PP2A in a neuroblastoma cell line.
Collapse
Affiliation(s)
- Atsuhiro Tanabe
- Laboratory of Pharmacology, School of Pharmacy, Kitasato University, Minato-ku, Tokyo, Japan.
| | | | | | | | | | | |
Collapse
|
44
|
Nakashima M, Shigekuni Y, Obi T, Shiraishi M, Miyamoto A, Yamasaki H, Etoh T, Iwai S. Nitric oxide-dependent hypotensive effects of wax gourd juice. J Ethnopharmacol 2011; 138:404-407. [PMID: 21963558 DOI: 10.1016/j.jep.2011.09.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 09/16/2011] [Accepted: 09/16/2011] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The wax gourd (Benincasa hispida (Thunb) Cong.) is a long-season vegetable that has been used in traditional Chinese medicine to treat high blood pressure. However, precise details of its effect and the mechanism of action involved are still lacking. MATERIALS AND METHODS Ten-fold-condensed wax gourd juice was used for the experiments. We measured (1) blood pressure of anesthetized normal Wistar rats in vivo, (2) isolated rat aortic contraction and relaxation, and (3) nitric oxide production from cultured porcine endothelial cells. The rats mentioned had not been treated with the investigational medicine. RESULTS Intravenous injection of the juice produced a dose-dependent decrease in blood pressure. Treatment with the juice induced concentration-dependent relaxation of isolated rat aortic rings that had been precontracted with noradrenaline. The relaxation induced by the juice was strongly inhibited by treatment with the nitric oxide (NO) synthase inhibitor N(G)-nitro-l-arginine methyl ester hydrochloride (l-NAME) or endothelial denudation. Treatment with the juice produced NO from cultured porcine aortic endothelial cells. This NO production was significantly inhibited by l-NAME. CONCLUSIONS The present findings suggest that wax gourd juice exerts a hypotensive effect via endothelium-dependent vasodilation. The main endothelium-derived relaxing factor involved might be NO.
Collapse
Affiliation(s)
- Miki Nakashima
- Laboratory of Horticultural Science, Faculty of Agriculture, Kagoshima University, Japan
| | | | | | | | | | | | | | | |
Collapse
|
45
|
|
46
|
Kasuya G, Ogawa K, Nagai Y, Shiraishi M, Hirakawa M, Toita T, Kakinohana Y, Nishimaki T, Aoki Y, Murayama S. Risk Factors of Severe Late Complications in Patients with Uterine Cancer Treated with Postoperative Radiotherapy. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
47
|
Shiraishi M, Yamaguchi A, Tamura A, Naito K, Adachi H. [Combined aortic root replacement and pectus excavatum correction in Marfan's syndrome]. Kyobu Geka 2010; 63:1049-1052. [PMID: 21066846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A 53-year-old man with Marfan's syndrome was admitted for repair of annulo-aortic ectasia (58 mm). He had also severe pectus excavatum. The skin was incised along the sternal midline. The pectoral muscles were detached laterally. After the perichondrium and costal cartilages were resected bilaterally. the left-sided intercostal muscles and perichondrial sheaths were divided 3 cm lateral to the sternum. To place the retractor in parasternal position, excellent exposure of the heart and aortic root was enabled. The aortic root was replaced with a Carboseal graft. Chest wall reconstructions was completed by modified Ravitch procedure with Gore-tex sheet The patient was discharged after an uneventful recovery on postoperative day 14.
Collapse
Affiliation(s)
- M Shiraishi
- Department of Cardiovascular Surgery, Saitama Medical Center, Jichi Medical School, Saitama, Japan
| | | | | | | | | |
Collapse
|
48
|
Abstract
OBJECTIVE To compare levels of plasma digestive hormones in patients with and without nausea or vomiting during initial treatment of early-stage Parkinson's disease (PD). METHODS This was a 3-week, open-label, randomized study of treatment with an antiparkinson drug in untreated PD patients. We measured the levels of plasma digestive hormones before (baseline) and 3 weeks after administration of an antiparkinson drug. RESULTS Mean value of serum somatostatin at baseline was significantly increased in PD patients compared with the control group (P < 0.01). Serum somatostatin levels were significantly increased after treatment in subjects who experienced nausea or vomiting (P < 0.01). However, significant increase in serum somatostatin levels after treatment was not observed in PD patients without nausea or vomitting. CONCLUSION Serum somatostatin in early-stage PD patients before treatment was increased compared with healthy subjects. The nausea and vomiting induced by antiparkinson drugs may be related to uncontrolled somatostatin secretion through central vagus nerve dysfunction.
Collapse
Affiliation(s)
- M Shiraishi
- Department of Neurology, St Marianna University School of Medicine, Kawasaki, Kanagawa, Japan.
| | | | | | | | | |
Collapse
|
49
|
Shiraishi M, Tani E, Miyamoto A. Modulation of rabbit platelet aggregation and calcium mobilization by platelet cholesterol content. J Vet Med Sci 2009; 72:285-92. [PMID: 19952511 DOI: 10.1292/jvms.09-0385] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Hypercholesterolemia is one of the major contributing factors in atherosclerosis and the development of cardiovascular disease. Platelets from hypercholesterolemic rabbit have an increased cholesterol content and a hypersensitivity to endogenous aggregating agonists. Although rabbit has been widely used in studies of hypercholesterolemia, the precise role of platelet cholesterol in rabbit platelet activation has not been studied. In the present study, to determine the direct role of cholesterol on rabbit platelet activation, we examined the effect of in vitro modulation of cholesterol content on platelet activation. Cholesterol-depleted rabbit platelets by the treatment with methyl-beta-cyclodextrin showed decreased platelet aggregation by physiological agonists such as thrombin, adenosine diphosphate, and collagen. The inhibition of thrombin-induced aggregation in cholesterol-depleted platelets was restored by cholesterol repletion in platelets. The cholesterol depletion also inhibited Ca(2+) mobilization, which plays a pivotal role in the platelet activation induced by physiological agonists. We showed that the Ca(2+) influx pathway is strongly suppressed by cholesterol depletion more than Ca(2+) release from intracellular Ca(2+) stores in platelets stimulated with thrombin. Furthermore, platelet aggregation induced by PMA, a potent protein kinase C activator, was also depressed by cholesterol depletion. On the other hand, cholesterol enrichment in platelets augmented thrombin-induced aggregation and Ca(2+) mobilization. These findings suggest that cholesterol plays a critical role in regulating rabbit platelet activation, and provides fundamental information regarding hypercholesterolemia-mediated effects on cells in the rabbit model.
Collapse
Affiliation(s)
- Mitsuya Shiraishi
- Department of Veterinary Pharmacology, Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | | | | |
Collapse
|
50
|
Yamaguchi H, Shiraishi M, Fukami K, Tanabe A, Ikeda-Matsuo Y, Naito Y, Sasaki Y. MARCKS regulates lamellipodia formation induced by IGF-I via association with PIP2 and beta-actin at membrane microdomains. J Cell Physiol 2009; 220:748-55. [PMID: 19475567 DOI: 10.1002/jcp.21822] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Myristoylated alanine-rich C kinase substrate (MARCKS) is considered to participate in formation of F-actin-based lamellipodia, which represents the first stage of neurite formation. However, the mechanism of how MARCKS is involved in lamellipodia formation is not precisely unknown. Using SH-SY5Y cells, we demonstrated here that MARCKS was translocated from cytosol to detergent-resistant membrane microdomains, known as lipid rafts, within 30 min after insulin-like growth factor-I (IGF-I) stimulation, which was accompanied by MARCKS dephosphorylation, beta-actin accumulation in lipid rafts, and lamellipodia formation. The protein kinase C inhibitor, Ro-31-8220, and Rho-kinase inhibitors, HA1077 and Y27632, themselves decreased basal phosphorylation levels of MARCKS and coincidently elicited translocation of MARCKS to lipid rafts. On the other hand, the phosphoinositide 3-kinase inhibitor, LY294002, abolished IGF-I-induced dephosphorylation, translocation of MARCKS to lipid rafts, and lamellipodia formation. Treatment of cells with neomycin, a PIP2-masking reagent, attenuated the translocation of MARCKS to lipid rafts and the lamellipodia formation induced by IGF-I, although dephosphorylation of MARCKS was not affected. Immunocytochemical and immunoprecipitation analysis indicated that IGF-I stimulation induced the translocation of MARCKS to lipid rafts in the edge of lamellipodia and formation of the complex with PIP2. Moreover, we demonstrated that knockdown of endogenous MARCKS resulted in significant attenuation of IGF-I-induced beta-actin accumulation in the lipid rafts and lamellipodia formation. These results suggest a novel role for MARCKS in lamellipodia formation induced by IGF-I via the translocation of MARCKS, association with PIP2, and accumulation of beta-actin in the membrane microdomains.
Collapse
Affiliation(s)
- Hiroki Yamaguchi
- Laboratory of Pharmacology, School of Pharmaceutical Science, Kitasato University, Tokyo, Japan
| | | | | | | | | | | | | |
Collapse
|