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Wang D, He J, Chen Y, Liu B, Wu Z, Pan X, Niu X. Harnessing in vivo synthesis of bioactive multiarylmethanes in Escherichia coli via oxygen-mediated free radical reaction induced by simple phenols. Microb Cell Fact 2024; 23:219. [PMID: 39103877 DOI: 10.1186/s12934-024-02494-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 07/29/2024] [Indexed: 08/07/2024] Open
Abstract
BACKGROUND Xanthenes and multi-aryl carbon core containing compounds represent different types of complex and condensed architectures that have impressive wide range of pharmacological, industrial and synthetic applications. Moreover, indoles as building blocks were only found in naturally occurring metabolites with di-aryl carbon cores and in chemically synthesized tri-aryl carbon core containing compounds. Up to date, rare xanthenes with indole bearing multicaryl carbon core have been reported in natural or synthetic products. The underlying mechanism of fluorescein-like arthrocolins with tetra-arylmethyl core were synthesized in an engineered Escherichia coli fed with toluquinol remained unclear. RESULTS In this study, the Keio collection of single gene knockout strains of 3901 mutants of E. coli BW25113, together with 14 distinct E. coli strains, was applied to explore the origins of endogenous building blocks and the biogenesis for arthrocolin assemblage. Deficiency in bacterial respiratory and aromatic compound degradation genes ubiX, cydB, sucA and ssuE inhibited the mutant growth fed with toluquinol. Metabolomics of the cultures of 3897 mutants revealed that only disruption of tnaA involving in transforming tryptophan to indole, resulted in absence of arthrocolins. Further media optimization, thermal cell killing and cell free analysis indicated that a non-enzyme reaction was involved in the arthrocolin biosynthesis in E. coli. Evaluation of redox potentials and free radicals suggested that an oxygen-mediated free radical reaction was responsible for arthrocolins formation in E. coli. Regulation of oxygen combined with distinct phenol derivatives as inducer, 31 arylmethyl core containing metabolites including 13 new and 8 biological active, were isolated and characterized. Among them, novel arthrocolins with p-hydroxylbenzene ring from tyrosine were achieved through large scale of aerobic fermentation and elucidated x-ray diffraction analysis. Moreover, most of the known compounds in this study were for the first time synthesized in a microbe instead of chemical synthesis. Through feeding the rat with toluquinol after colonizing the intestines of rat with E. coli, arthrocolins also appeared in the rat blood. CONCLUSION Our findings provide a mechanistic insight into in vivo synthesis of complex and condensed arthrocolins induced by simple phenols and exploits a quinol based method to generate endogenous aromatic building blocks, as well as a methylidene unit, for the bacteria-facilitated synthesis of multiarylmethanes.
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Affiliation(s)
- Donglou Wang
- State Key Laboratory for Conservation and Utilization of Bio-Resources & Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, P. R. China
| | - Jiangbo He
- Kunming Key Laboratory of Respiratory Disease, Kunming University, Kunming, 650214, P. R. China
| | - Yonghong Chen
- State Key Laboratory for Conservation and Utilization of Bio-Resources & Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, P. R. China
| | - Boran Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources & Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, P. R. China
| | - Zhuang Wu
- State Key Laboratory for Conservation and Utilization of Bio-Resources & Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, P. R. China
| | - Xuerong Pan
- State Key Laboratory for Conservation and Utilization of Bio-Resources & Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, P. R. China
| | - Xuemei Niu
- State Key Laboratory for Conservation and Utilization of Bio-Resources & Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, P. R. China.
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Sadeghi Nejad Z, Kazemian S, Galedari A, Maneshian M, Esmaeilpour K, Kalantaripour TP, Asadi-Shekaari M. Naringenin mitigates reserpine-induced anxiety-like behavior, neurodegeneration, and oxidative stress in male rats. NEUROSCIENCE AND BEHAVIORAL PHYSIOLOGY 2023; 53:1-7. [PMID: 37359811 PMCID: PMC10193352 DOI: 10.1007/s11055-023-01401-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Reserpine (Res) induces anxiety-like behaviors, orofacial dyskinesia, and neurodegeneration in animals, the pathophysiology of which has been related to oxidative stress. The purpose of this study was to investigate whether naringenin (NG) could prevent reserpine-induced anxiety-like behaviors, orofacial dyskinesia, and neurodegeneration in male rats. Twenty-eight male rats were distributed into different groups as follows: Control rats; vehicle rats, which received the vehicles (normal saline, orally; acetic acid, intraperitoneally); Res rats (1 mg/kg/day) every other day for 3 days; and Res + NG rats, which received NG (50 mg/kg, orally, pre-treatment for 7 days), followed by Res. Administration of Res significantly increased chewing frequency compared with the control group (P < 0.01) and NG reversed the effect of Res on this factor (P < 0.05). Res induced an anxiety-like behavior in rats in the plus maze, and pre-treatment with NG improved this behavior. In addition, Res significantly increased the level of oxidative stress markers and degenerated neurons in the striatum; NG was able to ameliorate these damages. The results of this study demonstrated that Res caused behavioral disorders and increased the levels of oxidative stress in male rats; the use of NG was effective in treating these disorders. Therefore, NG should be considered as a preventive agent for reserpine-induced brain damage in male rats.
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Affiliation(s)
- Zahra Sadeghi Nejad
- Student Research Committee, Kerman University of Medical Sciences, Kerman, Iran
| | - Sahar Kazemian
- Student Research Committee, Kerman University of Medical Sciences, Kerman, Iran
| | - Ali Galedari
- Student Research Committee, Kerman University of Medical Sciences, Kerman, Iran
| | - Marzieh Maneshian
- Neuroscience Research Center, Neuropharmacology Institute, Kerman University of Medical Sciences, Ebn Sina Avenue, Kerman, Iran
| | - Khadijeh Esmaeilpour
- Neuroscience Research Center, Neuropharmacology Institute, Kerman University of Medical Sciences, Ebn Sina Avenue, Kerman, Iran
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Canada
| | - Taj Pari Kalantaripour
- Department of Basic Sciences, School of Medicine, Branch of Kerman, Islamic Azad University, Kerman, Iran
| | - Majid Asadi-Shekaari
- Neuroscience Research Center, Neuropharmacology Institute, Kerman University of Medical Sciences, Ebn Sina Avenue, Kerman, Iran
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Guzen FP, Cavalcanti JRLDP, Cavalcanti DMLDP, de Sales LGP, da Silva MSM, da Silva ANA, Pinheiro FI, de Araújo DP. Haloperidol-Induced Preclinical Tardive Dyskinesia Model in Rats. ACTA ACUST UNITED AC 2020; 88:e68. [PMID: 31216395 DOI: 10.1002/cpns.68] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Haloperidol is a first-generation antipsychotic used in the treatment of psychoses, especially schizophrenia. This drug acts by blocking dopamine D2 receptors, reducing psychotic symptoms. Notwithstanding its benefits, haloperidol also produces undesirable impacts, in particular extrapyramidal effects such as tardive dyskinesia (TD), which limit the use of this and related drugs. TD is characterized by repetitive involuntary movements occurring after chronic exposure therapy with haloperidol. Symptoms most commonly manifest in the orofacial area and include involuntary movements, tongue protrusion, pouting lips, chewing in the absence of any object to chew, and facial grimacing. The most serious aspect of TD is that it may persist for months or years after drug withdrawal and is irreversible in some patients. This unit, aimed at facilitating the study of TD, describes methods to induce TD in rats using haloperidol, as well as procedures for evaluating the animals's TD-related symptoms. © 2019 by John Wiley & Sons, Inc.
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Affiliation(s)
- Fausto Pierdoná Guzen
- Faculty of Medicine, State University of Rio Grande do Norte (UERN), Mossoró, Rio Grande do Norte, Brazil.,Potiguar University, Laureate International Universities, Mossoró, Rio Grande do Norte, Brazil
| | | | | | | | | | | | | | - Dayane Pessoa de Araújo
- Faculty of Nursing, State University of Rio Grande do Norte (UERN), Mossoró, Rio Grande do Norte, Brazil
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Kronbauer M, Metz VG, Roversi K, Milanesi LH, Rubert Rossato D, da Silva Barcelos RC, Burger ME. Influence of magnesium supplementation and L-type calcium channel blocker on haloperidol-induced movement disturbances. Behav Brain Res 2019; 374:112119. [PMID: 31374223 DOI: 10.1016/j.bbr.2019.112119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 06/10/2019] [Accepted: 07/28/2019] [Indexed: 11/17/2022]
Abstract
Haloperidol (Hal) is an antipsychotic related to movement disorders. Magnesium (Mg) showed benefits on orofacial dyskinesia (OD), suggesting its involvement with N-methyl-D-aspartate receptors (NMDAR) since it acts blocking calcium channels. Comparisons between nifedipine (NIF; a calcium channel blocker) and Mg were performed to establish the Mg mechanism. Male rats concomitantly received Hal and Mg or NIF for 28 days, and OD behaviors were weekly assessed. Both Mg and NIF decreased Hal-induced OD. Hal increased Ca2+-ATPase activity in the striatum, and Mg reversed it. In the cortex, both Mg and NIF decreased such activity. Dopaminergic and glutamatergic immunoreactivity were modified by Hal and treatments: i) in the cortex: Hal reduced D1R and D2R, increasing NMDAR immunoreactivity. Mg and NIF reversed this Hal influence on D1R and NMDAR, while only Mg reversed Hal effects on D2R levels; ii) in the striatum: Hal decreased D2R and increased NMDAR while Mg and NIF decreased D1R and reversed the Hal-induced decreasing D2R levels. Only Mg reversed the Hal-induced increasing NMDAR levels; iii) in the substantia nigra (SN): while Hal increased D1R, D2R, and NMDAR, both Mg and NIF reversed this influence on D2R, but only Mg reversed the Hal-influence on D1R levels. Only NIF reversed the Hal effects on NMDAR immunoreactivity. These findings allow us to propose that Mg may be useful to minimize Hal-induced movement disturbances. Mg molecular mechanism seems to be involved with a calcium channel blocker because the NIF group showed less expressive effects than the Mg group.
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Affiliation(s)
- Maikel Kronbauer
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | - Vinicia Garzela Metz
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | - Karine Roversi
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | - Laura H Milanesi
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | | | | | - Marilise E Burger
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil; Departamento de Fisiologia e Farmacologia, UFSM, RS, Brazil.
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de Araújo DP, Camboim TGM, Silva APM, Silva CDF, de Sousa RC, Barbosa MDA, Oliveira LC, Cavalcanti JRLDP, Lucena EEDS, Guzen FP. Behavioral and neurochemical effects of alpha lipoic acid associated with omega-3 in tardive dyskinesia induced by chronic haloperidol in rats. Can J Physiol Pharmacol 2017; 95:837-843. [PMID: 28329449 DOI: 10.1139/cjpp-2016-0307] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Tardive dyskinesia (TD) is characterized by involuntary movements of the lower portion of the face being related to typical antipsychotic therapy. TD is associated with the oxidative imbalance in the basal ganglia. Lipoic acid (LA) and omega-3 (ω-3) are antioxidants acting as enzyme cofactors, regenerating antioxidant enzymes. This study aimed to investigate behavioral and neurochemical effects of supplementation with LA (100 mg/kg) and ω-3 (1 g/kg) in the treatment of TD induced by chronic use of haloperidol (HAL) (1 mg/kg) in rats. Wistar male rats were used, weighing between 180-200 g. The animals were treated chronically (31 days) with LA alone or associated with HAL or ω-3. Motor behavior was assessed by open-field test, the catalepsy test, and evaluation of orofacial dyskinesia. Oxidative stress was accessed by determination of lipid peroxidation and concentration of nitrite. LA and ω-3 alone or associated caused an improvement in motor performance by increasing locomotor activity in the open-field test and decreased the permanence time on the bar in the catalepsy test and decreased the orofacial dyskinesia. LA and ω-3 showed antioxidant effects, decreasing lipid peroxidation and nitrite levels. Thus, the use of LA associated with ω-3 reduced the extrapyramidal effects produced by chronic use of HAL.
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Affiliation(s)
- Dayane Pessoa de Araújo
- a Nursing Department, State University of Rio Grande do Norte - UERN/FAEN, Mossoró, RN, Brazil
| | - Thaisa Gracielle Martins Camboim
- b Students of Medicine, Department of Medicine, College of Health Sciences, State University of Rio Grande do Norte - UERN/FACS, Mossoró, RN, Brazil
| | - Ana Patrícia Magalhães Silva
- b Students of Medicine, Department of Medicine, College of Health Sciences, State University of Rio Grande do Norte - UERN/FACS, Mossoró, RN, Brazil
| | - Caio da Fonseca Silva
- b Students of Medicine, Department of Medicine, College of Health Sciences, State University of Rio Grande do Norte - UERN/FACS, Mossoró, RN, Brazil
| | - Rebeca Canuto de Sousa
- b Students of Medicine, Department of Medicine, College of Health Sciences, State University of Rio Grande do Norte - UERN/FACS, Mossoró, RN, Brazil
| | - Mabson Delâno Alves Barbosa
- b Students of Medicine, Department of Medicine, College of Health Sciences, State University of Rio Grande do Norte - UERN/FACS, Mossoró, RN, Brazil
| | | | | | | | - Fausto Pierdoná Guzen
- c Department of Medicine, College of Health Sciences, State University of Rio Grande do Norte - UERN/FACS, Mossoró, RN, Brazil
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Schaffer LF, de Freitas CM, Chiapinotto Ceretta AP, Peroza LR, de Moraes Reis E, Krum BN, Busanello A, Boligon AA, Sudati JH, Fachinetto R, Wagner C. Harpagophytum Procumbens Ethyl Acetate Fraction Reduces Fluphenazine-Induced Vacuous Chewing Movements and Oxidative Stress in Rat Brain. Neurochem Res 2016; 41:1170-84. [DOI: 10.1007/s11064-015-1811-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 12/16/2015] [Accepted: 12/18/2015] [Indexed: 12/18/2022]
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Molinaro L, Hui P, Tan M, Mishra RK. Role of presynaptic phosphoprotein synapsin II in schizophrenia. World J Psychiatry 2015; 5:260-272. [PMID: 26425441 PMCID: PMC4582303 DOI: 10.5498/wjp.v5.i3.260] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 04/30/2015] [Accepted: 06/11/2015] [Indexed: 02/05/2023] Open
Abstract
Synapsin II is a member of the neuronal phosphoprotein family. These phosphoproteins are evolutionarily conserved across many organisms and are important in a variety of synaptic functions, including synaptogenesis and the regulation of neurotransmitter release. A number of genome-wide scans, meta-analyses, and genetic susceptibility studies have implicated the synapsin II gene (3p25) in the etiology of schizophrenia (SZ) and other psychiatric disorders. Further studies have found a reduction of synapsin II mRNA and protein in the prefrontal cortex in post-mortem samples from schizophrenic patients. Disruptions in the expression of this gene may cause synaptic dysfunction, which can result in neurotransmitter imbalances, likely contributing to the pathogenesis of SZ. SZ is a costly, debilitating psychiatric illness affecting approximately 1.1% of the world’s population, amounting to 51 million people today. The disorder is characterized by positive (hallucinations, paranoia), negative (social withdrawal, lack of motivation), and cognitive (memory impairments, attention deficits) symptoms. This review provides a comprehensive summary of the structure, function, and involvement of the synapsin family, specifically synapsin II, in the pathophysiology of SZ and possible target for therapeutic intervention/implications.
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Kronbauer M, Segat HJ, De David Antoniazzi CT, Roversi K, Roversi K, Pase CS, Barcelos RCS, Burger ME. Magnesium Supplementation Prevents and Reverses Experimentally Induced Movement Disturbances in Rats: Biochemical and Behavioral Parameters. Biol Trace Elem Res 2015; 166:163-72. [PMID: 25686766 DOI: 10.1007/s12011-015-0268-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 02/04/2015] [Indexed: 10/24/2022]
Abstract
Reserpine administration results in a predictable animal model of orofacial dyskinesia (OD) that has been largely used to access movement disturbances related to extrapyramidal oxidative damage. Here, OD was acutely induced by reserpine (two doses of 0.7 mg/kg subcutaneous (s.c.)), every other day for 3 days), which was administered after (experiment 1) and before (experiment 2) magnesium (Mg) supplementation (40 mg/kg/mL, peroral (p.o.)). In experiment 1, Mg was administered for 28 days before reserpine treatment, while in experiment 2, it was initiated 24 h after the last reserpine administration and was maintained for 10 consecutive days. Experiment 1 (prevention) showed that Mg supplementation was able to prevent reserpine-induced OD and catalepsy development. Mg was also able to prevent reactive species (RS) generation, thus preventing increase of protein carbonyl (PC) levels in both cortex and substantia nigra, but not in striatum. Experiment 2 (reversion) showed that Mg was able to decrease OD and catalepsy at all times assessed. In addition, Mg was able to decrease RS generation, with lower levels of PC in both cortex and striatum, but not in substantia nigra. These outcomes indicate that Mg is an important metal that should be present in the diet, since its intake is able to prevent and minimize the development of movement disorders closely related to oxidative damage in the extrapyramidal brain areas, such as OD.
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Affiliation(s)
- Maikel Kronbauer
- Programa de Pós-Graduação em Bioquímica Toxicológica, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, 97105-900, Brazil
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Lister J, Nobrega JN, Fletcher PJ, Remington G. Oxidative stress and the antipsychotic-induced vacuous chewing movement model of tardive dyskinesia: evidence for antioxidant-based prevention strategies. Psychopharmacology (Berl) 2014; 231:2237-49. [PMID: 24752659 DOI: 10.1007/s00213-014-3582-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 04/02/2014] [Indexed: 12/23/2022]
Abstract
RATIONALE Despite decades of research, tardive dyskinesia (TD) remains a poorly understood iatrogenic movement disorder with few effective treatments and no known cure. Accordingly, the development of an innocuous strategy to prevent or mitigate antipsychotic (AP)-associated TD would represent an important clinical advance. Supporting evidence for antioxidant (AX)-based treatment regimens can be found in the preclinical literature, where AP-induced vacuous chewing movements (VCMs) in rats are attenuated by the concurrent administration of direct and indirect AXs. OBJECTIVES Our aim was to review the preclinical literature examining the role of AX-promoting treatments in the prevention of AP-induced VCMs in rats. METHODS A literature search using Google Scholar and PubMed was performed. Relevant results were qualitatively reviewed. RESULTS Studies featuring a variety of naturally occurring and synthetic AX treatments were identified and included in the review. The majority of studies used haloperidol (HAL), a typical AP, to induce VCMs. Studies revealed reduced VCMs in co-treated rats, with favorable changes seen in markers of oxidative stress (OS) and AX status, but were limited by their short durations. CONCLUSIONS Some preclinical evidence suggests that the inclusion of a naturally occurring and benign AX compound as an adjunct to AP treatment may help guard patients against TD, but additional long-duration studies are needed. This AX-based strategy is further substantiated by accumulating evidence of preexisting OS abnormalities in schizophrenia (SZ).
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Affiliation(s)
- Josh Lister
- Centre for Addiction and Mental Health, 250 College St., Toronto, ON, M5T 1R8, Canada,
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Sekiguchi K, Kanno H, Yamaguchi T, Ikarashi Y, Kase Y. Ameliorative effect of yokukansan on vacuous chewing movement in haloperidol-induced rat tardive dyskinesia model and involvement of glutamatergic system. Brain Res Bull 2012; 89:151-8. [PMID: 22982367 DOI: 10.1016/j.brainresbull.2012.08.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 08/29/2012] [Indexed: 11/18/2022]
Abstract
Effects of yokukansan (YKS) on vacuous chewing movement (VCM), which is an index for tardive dyskinesia, were investigated in haloperidol decanoate-treated rats. Haloperidol decanoate was injected to a thigh muscle once every four weeks for 18 weeks. The rats which exhibited VCM eight times or more in 3min were selected on the 12th week, and examined. A significant increase in VCM on the 12th week continued until the 18th week. Oral administration of YKS (0.1 and 0.5g/kg) once a day for three weeks (21 days) from the 12th week to 15th week ameliorated the haloperidol decanoate-induced increase in VCM in a dose-dependent manner. The significant ameliorative effect observed in 0.5g/kg YKS-treated rats was abolished by stopping administration for three weeks from the 15th week to the 18th week. The extracellular glutamate concentration and glutamate transporter mRNA expression in the striatum were evaluated by microdialysis and real-time reverse-transcription polymerase chain reaction assays at the 15th week. The striatal glutamate level increased in haloperidol-treated rats, and the increase was inhibited by treatment with YKS. The striatal GLT-1 mRNA level showed a tendency to decrease in the haloperidol-treated rats. The GLT-1 mRNA level after treatment with YKS (0.5g/kg) was greater than the control level. These results suggest the effect of YKS may be involved in the extracellular glutamate level and GLT-1 mRNA expression in the striatum.
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Affiliation(s)
- Kyoji Sekiguchi
- Tsumura Research Laboratories, Tsumura & Co., Ami-machi, Inashiki-gun, Ibaraki, Japan.
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