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Umakoshi T, Urakami T, Kidoguchi H, Yang K, Verma P, Sato H, Higashi M, Tsukamoto I. Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues. J Phys Chem A 2023; 127:1849-1856. [PMID: 36800899 DOI: 10.1021/acs.jpca.2c08382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
COA-Cl is a newly synthesized adenosine analogue that exhibits various physiological activities. Its angiogenic, neurotropic, and neuroprotective potencies make it promising for the development of medicines. In this study, we show Raman spectroscopic study of COA-Cl to elucidate molecular vibrations and related chemical properties. Density functional theory calculations were combined with the Raman spectroscopic data to understand the details of each vibrational mode. Comparative analysis with adenine, adenosine, and other nucleic acid analogues enabled identification of unique Raman peaks originating from the cyclobutane moiety and chloro group of COA-Cl. This study provides fundamental knowledge and crucial insights for further development of COA-Cl and related chemical species.
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Affiliation(s)
- Takayuki Umakoshi
- Institute for Advanced Co-Creation Studies, Osaka University, Suita, Osaka 565-0871, Japan.,Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.,PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Takumi Urakami
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Haruki Kidoguchi
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Keishi Yang
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Prabhat Verma
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hirofumi Sato
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.,Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Masahiro Higashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Takamatsu, Kagawa 761-0793, Japan
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Jamal M, Tsukamoto I, Maki T, Takei S, Konishi R, Kinoshita H. COA-Cl Evokes Protective Responses Against H 2O 2-and 6-OHDA-Induced Toxic Injury in PC12 Cells. Neurotox Res 2022; 40:2061-2071. [PMID: 36435924 DOI: 10.1007/s12640-022-00587-3] [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: 07/13/2022] [Revised: 09/22/2022] [Accepted: 10/08/2022] [Indexed: 11/27/2022]
Abstract
COA-Cl, a novel adenosine-like nucleic acid analog, has recently been shown to exert neuroprotective effects and to increase dopamine levels both in vivo and in vitro. Therefore, we hypothesized that COA-Cl could protect dopaminergic neurons against toxic insults. Thus, the present study aimed to investigate the protective effects of COA-Cl against hydrogen peroxide (H2O2)- and 6-hydroxydopamine (6-OHDA)-induced toxicity in PC12 cells and to elucidate the possible mechanisms. PC12 cells were incubated with COA-Cl (100 μM) with or without H2O2 or 6-OHDA (200 μM) for 24 h. Treatment with COA-Cl attenuated the decrease in cell viability, SOD activity and the Bcl-2/Bax ratio caused by H2O2. In addition, COA-Cl attenuated the increase in LDH release, ROS production, caspase-3 activity, and apoptosis induced by H2O2. Further, COA-Cl enhanced the protection of PC12 cells against the toxicity caused by 6-OHDA, as evidenced by an increase in cell viability and the Bcl-2/Bax ratio, and a decrease in LDH release. Our results are the first to demonstrate that COA-Cl potentially protects PC12 cells against toxicity induced by H2O2 and 6-OHDA, implying that COA-Cl could be a promising neuroprotective agent for the treatment of Parkinson's disease.
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Affiliation(s)
- Mostofa Jamal
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan.
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Takata Maki
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Sella Takei
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan
| | - Ryoji Konishi
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Hiroshi Kinoshita
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan
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Yan YC, Zhang H, Hu K, Zhou SM, Chen Q, Qu RY, Yang GF. A mini-review on synthesis and antiviral activity of natural product oxetanocin A derivatives. Bioorg Med Chem 2022; 72:116968. [PMID: 36054994 DOI: 10.1016/j.bmc.2022.116968] [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: 03/18/2022] [Revised: 08/02/2022] [Accepted: 08/16/2022] [Indexed: 11/29/2022]
Abstract
Oxetanocin A (Oxt-A), a novel oxetanosyl N-glycoside nucleoside, was isolated from Bacillus megaterium in 1986. It carries an oxetane ring on the sugar moiety of the nucleoside scaffold, which contributes to differences in its structure from those of common tetrahydrofuranyl-based nucleosides. In view of the unique 3D-spatial framework, the complete synthesis of Oxt-A has been achieved by multiple research groups. The pharmacological properties of this natural product have also been broadly investigated by pharmacists and chemists since its discovery. Notably, the potential antiviral effect of Oxt-A has captured attention of researchers in the field of antiviral agent development. Furthermore, epidemic outbreaks caused by viruses have been stimulating the preparation and modification of various Oxt-A analogs over the past few decades. However, none of the studies have overviewed the antiviral efficacies of this naturally occurring scaffold yet. Thus, the present review summarizes the synthesis, structural modification, and antiviral activities of Oxt-A and its derivatives. We believe that these comprehensive descriptions will provide a novel perspective for the discovery of antivirus drugs with well-improved performance and pave newer paths for combating sudden public health issues triggered by viruses in the future.
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Affiliation(s)
- Yao-Chao Yan
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Hu Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Kai Hu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Shao-Meng Zhou
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Qiong Chen
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Ren-Yu Qu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
| | - Guang-Fu Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
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Matsumoto T, Yoshino S, Furuyama T, Morisaki K, Nakano K, Koga JI, Maehara Y, Komori K, Mori M, Egashira K. Pitavastatin-Incorporated Nanoparticles for Chronic Limb Threatening Ischemia: A Phase I/IIa Clinical Trial. J Atheroscler Thromb 2022; 29:731-746. [PMID: 33907060 PMCID: PMC9135659 DOI: 10.5551/jat.58941] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 02/28/2021] [Indexed: 12/02/2022] Open
Abstract
AIM To assess the results of a phase I/IIa open-label dose-escalation clinical trial of 5-day repeated intramuscular administration of pitavastatin-incorporated poly (lactic-co-glycolic acid) nanoparticles (NK-104-NP) in patients with chronic limb threatening ischemia (CLTI). METHODS NK-104-NP was formulated using an emulsion solvent diffusion method. NK-104-NP at four doses (nanoparticles containing 0.5, 1, 2, and 4 mg of pitavastatin calcium, n=4 patients per dose) was investigated in a dose-escalation manner and administered intramuscularly into the ischemic limbs of 16 patients with CLTI. The safety and therapeutic efficacy of treatment were investigated over a 26-week follow-up period. RESULTS No cardiovascular or other serious adverse events caused by NK-104-NP were detected during the follow-up period. Improvements in Fontaine and Rutherford classifications were noted in five patients (one, three, and one in the 1-, 2-, and 4-mg dose groups, respectively). Pharmacokinetic parameters including the maximum serum concentration and the area under the blood concentration-time curve increased with pitavastatin treatment in a dose-dependent manner. The area under the curve was slightly increased at day 5 compared with that at day 1 of treatment, although the difference was not statistically significant. CONCLUSIONS This is the first clinical trial of pitavastatin-incorporated nanoparticles in patients with CLTI. Intramuscular administration of NK-104-NP to the ischemic limbs of patients with CLTI was safe and well tolerated and resulted in improvements in limb function.
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Affiliation(s)
- Takuya Matsumoto
- Department of Vascular Surgery, National Hospital Organization Fukuoka-higashi Medical Center, Fukuoka, Japan
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Shinichiro Yoshino
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Tadashi Furuyama
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Koichi Morisaki
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kaku Nakano
- Department of Cardiovascular Research, Development, and Translational Medicine, Center for Disruptive Cardiovascular Innovation, Kyushu University, Fukuoka, Japan
| | - Jun-ichiro Koga
- Department of Cardiovascular Research, Development, and Translational Medicine, Center for Disruptive Cardiovascular Innovation, Kyushu University, Fukuoka, Japan
- Department of Cardiovascular Medicine, Kyusyu University Graduate School of Medical Sciences, Fukuoka, Japan
| | - Yoshihiko Maehara
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kimihiro Komori
- Division of Vascular Surgery, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masaki Mori
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kensuke Egashira
- Department of Cardiovascular Research, Development, and Translational Medicine, Center for Disruptive Cardiovascular Innovation, Kyushu University, Fukuoka, Japan
- Department of Translational Medicine, Kyushu University Graduate School of Pharmaceutical Sciences, Fukuoka, Japan
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Santos SS, Gonzaga RV, Scarim CB, Giarolla J, Primi MC, Chin CM, Ferreira EI. Drug/Lead Compound Hydroxymethylation as a Simple Approach to Enhance Pharmacodynamic and Pharmacokinetic Properties. Front Chem 2022; 9:734983. [PMID: 35237565 PMCID: PMC8883432 DOI: 10.3389/fchem.2021.734983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 10/20/2021] [Indexed: 11/17/2022] Open
Abstract
Hydroxymethylation is a simple chemical reaction, in which the introduction of the hydroxymethyl group can lead to physical–chemical property changes and offer several therapeutic advantages, contributing to the improved biological activity of drugs. There are many examples in the literature of the pharmaceutical, pharmacokinetic, and pharmacodynamic benefits, which the hydroxymethyl group can confer to drugs, prodrugs, drug metabolites, and other therapeutic compounds. It is worth noting that this group can enhance the drug’s interaction with the active site, and it can be employed as an intermediary in synthesizing other therapeutic agents. In addition, the hydroxymethyl derivative can result in more active compounds than the parent drug as well as increase the water solubility of poorly soluble drugs. Taking this into consideration, this review aims to discuss different applications of hydroxymethyl derived from biological agents and its influence on the pharmacological effects of drugs, prodrugs, active metabolites, and compounds of natural origin. Finally, we report a successful compound synthesized by our research group and used for the treatment of neglected diseases, which is created from the hydroxymethylation of its parent drug.
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Affiliation(s)
- Soraya S. Santos
- Laboratório de Planejamento e Síntese de Quimioterápicos Potencialmente Ativos Em Doenças Negligenciadas (LAPEN), Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo – USP, São Paulo, Brazil
| | - Rodrigo V. Gonzaga
- Laboratório de Planejamento e Síntese de Quimioterápicos Potencialmente Ativos Em Doenças Negligenciadas (LAPEN), Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo – USP, São Paulo, Brazil
| | - Cauê B. Scarim
- Laboratório de Pesquisa e Desenvolvimento de Fármacos (LAPDESF), Departamento de Fármacos e Medicamentos, Faculdade de Ciências Farmacêuticas, Universidade Estadual de São Paulo “Júlio de Mesquita Filho” (UNESP), Araraquara, Brazil
| | - Jeanine Giarolla
- Laboratório de Planejamento e Síntese de Quimioterápicos Potencialmente Ativos Em Doenças Negligenciadas (LAPEN), Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo – USP, São Paulo, Brazil
| | | | - Chung M. Chin
- Laboratório de Pesquisa e Desenvolvimento de Fármacos (LAPDESF), Departamento de Fármacos e Medicamentos, Faculdade de Ciências Farmacêuticas, Universidade Estadual de São Paulo “Júlio de Mesquita Filho” (UNESP), Araraquara, Brazil
- Centro de Pesquisa Avançada Em Medicina (CEPAM), Faculdade de Medicina, União Das Faculdades Dos Grande Lagos (UNILAGO), São José Do Rio Preto, Brazil
| | - Elizabeth I. Ferreira
- Laboratório de Planejamento e Síntese de Quimioterápicos Potencialmente Ativos Em Doenças Negligenciadas (LAPEN), Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo – USP, São Paulo, Brazil
- *Correspondence: Elizabeth I. Ferreira,
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Sakamoto I, Himi N, Hayashi N, Okabe N, Nakamura-Maruyama E, Tsukamoto I, Hasegawa T, Miyamoto O. The protective effect and mechanism of COA-Cl in acute phase after spinal cord injury. Neurosci Res 2020; 170:114-121. [PMID: 33316301 DOI: 10.1016/j.neures.2020.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 09/16/2020] [Accepted: 10/16/2020] [Indexed: 11/28/2022]
Abstract
Spinal cord injury (SCI) induces severe motor and sensory dysfunction. We previously showed the neuroprotective effects of COA-Cl, a novel synthesized adenosine analog, in a rat stroke model. In this study, we evaluated the neuroprotective effects of COA-Cl in acute phase of SCI. SCI was induced in rats at the T9 vertebra by using a drop device. Rats were divided into acute and subacute groups. A 5-day dose of 6 mg/kg COA-Cl in saline was given to the acute group immediately after SCI and the subacute group 4 days after SCI. Motor function assessed by Basso-Beattie-Bresnahan scoring and inclined plane test improved significantly in the acute group while the subacute group did not. Histological evaluation and TUNEL staining revealed that both the cavity volume and apoptosis were significantly decreased in the acute group compared with the subacute group. In addition, pERK/ERK was increased in the acute group 7 days after SCI. These results suggest that COA-Cl exerts neuroprotective effects via the ERK pathway when administered in the acute phase after SCI, resulting in the recovery of motor function. COA-Cl could be a novel therapeutic agent for the acute phase of SCI.
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Affiliation(s)
- Issei Sakamoto
- Department of Physiology 2, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan; Department of Orthopedic Surgery, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan
| | - Naoyuki Himi
- Department of Physiology 2, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan.
| | - Norito Hayashi
- Department of Physiology 2, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan; Department of Orthopedic Surgery, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan
| | - Naohiko Okabe
- Department of Physiology 2, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan
| | - Emi Nakamura-Maruyama
- Department of Physiology 2, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan
| | - Ikuko Tsukamoto
- Department of Pharmaco-bio-informatics, Kagawa University Faculty of Medicine, Miki, Kagawa, Japan
| | - Toru Hasegawa
- Department of Orthopedic Surgery, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan
| | - Osamu Miyamoto
- Department of Physiology 2, Kawasaki Medical School, Matsushima, Kurashiki, Okayama, Japan
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Kawami M. [Investigation of Drug-induced Lung Injury for the Development of a Novel Therapeutic Approach]. YAKUGAKU ZASSHI 2020; 140:15-22. [PMID: 31902879 DOI: 10.1248/yakushi.19-00133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The development of serious lung diseases, such as pulmonary fibrosis, is associated with several drugs. A recent study has shown that the epithelial-mesenchymal transition (EMT) plays an essential role in the development of pulmonary fibrosis. However, the mechanisms underlying drug-induced EMT in alveolar epithelial cells have not been characterized. The present study showed that methotrexate (MTX), a drug known to cause lung injury, induced EMT-like phenotypic changes in an A549 cell model of the alveolar epithelium. We also found that the transforming growth factor (TGF)-β1-mediated signaling pathway was associated with MTX-induced EMT. In addition, our results showed that certain secreted factors and microRNAs, a class of small noncoding RNAs, may be involved in MTX-induced EMT. The effects of COA-Cl, a novel synthetic small molecule, on TGF-β1-induced EMT were evaluated to determine the therapeutic potential of COA-Cl against drug-induced lung injury. COA-Cl significantly suppressed TGF-β1-induced EMT-like phenotypic changes, as evidenced by the inhibition of EMT-related transcription factors. Furthermore, MTX-induced EMT was completely suppressed by co-treatment with folic acid. Thus, these compounds may be promising therapeutic agents against drug-induced lung injury. In conclusion, the present study elucidated mechanisms underlying drug-induced EMT and highlighted a potential novel therapeutic approach to drug-induced lung diseases.
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Affiliation(s)
- Masashi Kawami
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical & Health Sciences, Hiroshima University
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Nakai K, Karita S, Igarashi J, Tsukamoto I, Hirano K, Kubota Y. COA-Cl prevented TGF-β1-induced CTGF expression by Akt dephosphorylation in normal human dermal fibroblasts, and it attenuated skin fibrosis in mice models of systemic sclerosis. J Dermatol Sci 2019; 94:205-212. [DOI: 10.1016/j.jdermsci.2019.02.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 02/19/2019] [Accepted: 02/21/2019] [Indexed: 01/13/2023]
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COA-Cl induces dopamine release and tyrosine hydroxylase phosphorylation: In vivo reverse microdialysis and in vitro analysis. Brain Res 2019; 1706:68-74. [PMID: 30366020 DOI: 10.1016/j.brainres.2018.10.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 10/17/2018] [Accepted: 10/22/2018] [Indexed: 11/22/2022]
Abstract
We found that local perfusion of COA-Cl (0.1, 0.4, or 1.0 mM) into the dorsal striatum of living mice produced a significant and dose-dependent increase in extracellular DA levels, with the highest dose of 1.0 mM COA-Cl producing an approximately 5-fold increase in DA. Consistent with in vivo findings, 0.1 and 0.2 mM COA-Cl significantly and dose-dependently enhanced DA release 3.0 to 5.0-fold in PC12 cells, an in vitro model of DA-responsive neurons. Interestingly, the increase in striatal DA levels by COA-Cl in vivo was similar in magnitude to that observed in PC12 cells. Treatment with 0.1 mM COA-Cl significantly increased both Ser31 and Ser40 phosphorylation of tyrosine hydroxylase (TH) in PC12 cells, and Ser40 phosphorylation in iCell neurons, without altering total TH protein levels. Further, we examined whether COA-Cl could stimulate neurite outgrowth in PC12 cells and iCell neurons and found that COA-Cl significantly induced neurite outgrowth in both cell lines. Our results provide the first evidence that COA-Cl can stimulate dose-dependent DA release and activation of TH phosphorylation, suggesting that COA-Cl may be a promising therapeutic candidate for the treatment of neurological dysfunction associated with low DA.
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Nishikido T, Oyama JI, Shiraki A, Tsukamoto I, Igarashi J, Node K. COA-Cl (2-Cl-C.OXT-A) can promote coronary collateral development following acute myocardial infarction in mice. Sci Rep 2019; 9:2533. [PMID: 30796271 PMCID: PMC6385273 DOI: 10.1038/s41598-019-39222-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 01/11/2019] [Indexed: 01/04/2023] Open
Abstract
2-Cl-C.OXT-A (COA-Cl) is a novel nucleic acid analogue that promotes tube-forming activity of human umbilical vein endothelial cells (HUVEC) through vascular endothelial growth factor (VEGF). The development of coronary collateral circulation is critical to rescue the ischemic myocardium and to prevent subsequent irreversible ischemic injury. We evaluated whether COA-Cl can promote angiogenesis in ischemic tissue, reduce infarct size and preserve cardiac contractility in vivo. Mice received COA-Cl or placebo daily for three days after myocardial infarction (MI) by coronary ligation. The degree of angiogenesis in ischemic myocardium was assessed by staining endothelial cells and vascular smooth muscle cells, and measuring infarct size/area-at-risk. In mice treated with COA-Cl, enhanced angiogenesis and smaller infarct size were recognized, even given a similar area at risk. We observed increases in the protein expression levels of VEGF and in the protein phosphorylation level of eNOS. In addition, the heart weight to body weight ratio and myocardial fibrosis in COA-Cl mice were decreased on Day 7. Administration of COA-Cl after MI promotes angiogenesis, which is associated with reduced infarct size and attenuated cardiac remodeling. This may help to prevent heart failure due to cardiac dysfunction after MI.
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Affiliation(s)
- Toshiyuki Nishikido
- Department of Cardiovascular of Medicine, Saga University Hospital, Saga, Japan
| | - Jun-Ichi Oyama
- Department of Cardiovascular of Medicine, Saga University Hospital, Saga, Japan.
| | - Aya Shiraki
- Department of Cardiovascular of Medicine, Saga University Hospital, Saga, Japan
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Kagawa University, Kagawa, Japan
| | - Junsuke Igarashi
- Graduate School of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | - Koichi Node
- Department of Cardiovascular of Medicine, Saga University Hospital, Saga, Japan
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Kawami M, Deguchi J, Yumoto R, Sakakibara N, Tsukamoto I, Konishi R, Takano M. Effect of COA-Cl on transforming growth factor-β1-induced epithelial–mesenchymal transition in RLE/Abca3 cells. Drug Metab Pharmacokinet 2017; 32:224-227. [DOI: 10.1016/j.dmpk.2017.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 04/19/2017] [Accepted: 05/09/2017] [Indexed: 01/15/2023]
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Sakakibara N, Igarashi J, Takata M, Konishi R, Kato Y, Tsukamoto I. Synthesis and Evaluation of Novel Cyclopropane Nucleoside as Potential Tube Formation Agents. Chem Pharm Bull (Tokyo) 2017; 65:504-510. [DOI: 10.1248/cpb.c17-00056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Norikazu Sakakibara
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University
| | - Junsuke Igarashi
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University
| | - Maki Takata
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University
| | - Ryoji Konishi
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University
| | - Yoshihisa Kato
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University
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Lu F, Nakamura T, Okabe N, Himi N, Nakamura-Maruyama E, Shiromoto T, Narita K, Tsukamoto I, Xi G, Keep RF, Miyamoto O. COA-Cl, a Novel Synthesized Nucleoside Analog, Exerts Neuroprotective Effects in the Acute Phase of Intracerebral Hemorrhage. J Stroke Cerebrovasc Dis 2016; 25:2637-2643. [DOI: 10.1016/j.jstrokecerebrovasdis.2016.07.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 06/16/2016] [Accepted: 07/02/2016] [Indexed: 10/21/2022] Open
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Sakakibara N, Igarashi J, Takata M, Demizu Y, Misawa T, Kurihara M, Konishi R, Kato Y, Maruyama T, Tsukamoto I. Synthesis and Evaluation of Novel Carbocyclic Oxetanocin A (COA-Cl) Derivatives as Potential Tube Formation Agents. Chem Pharm Bull (Tokyo) 2016; 63:701-9. [PMID: 26329863 DOI: 10.1248/cpb.c15-00386] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Six novel carbocyclic oxetanocin A analogs (2-chloro-C.OXT-A; COA-Cl) with various hydroxymethylated or spiro-conjugated cyclobutane rings at the N(9)-position of the 2-chloropurine moiety were synthesized and evaluated using human umbilical vein endothelial cells. All prepared compounds (2a-f) showed good to moderate activity with angiogenic potency. Among these compounds, 100 µM cis-trans-2',3'-bis(hydroxymethyl)cyclobutyl derivative (2b), trans-3'-hydroxymethylcyclobutyl analog (2d), and 3',3'-bis(hydroxymethyl)cyclobutyl derivative (2e) had greater angiogenic activity, with relative tube areas of 3.43±0.44, 3.32±0.53, and 3.59±0.83 (mean±standard deviation (S.D.)), respectively, which was comparable to COA-Cl (3.91±0.78). These data may be important for further development of this class of compounds as potential tube formation agents.
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Affiliation(s)
- Norikazu Sakakibara
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University
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Igarashi J, Okamoto R, Yamashita T, Hashimoto T, Karita S, Nakai K, Kubota Y, Takata M, Yamaguchi F, Tokuda M, Sakakibara N, Tsukamoto I, Konishi R, Hirano K. A key role of PGC-1α transcriptional coactivator in production of VEGF by a novel angiogenic agent COA-Cl in cultured human fibroblasts. Physiol Rep 2016; 4:e12742. [PMID: 27033444 PMCID: PMC4814893 DOI: 10.14814/phy2.12742] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 02/23/2016] [Accepted: 02/27/2016] [Indexed: 01/16/2023] Open
Abstract
We previously demonstrated a potent angiogenic effect of a newly developed adenosine-like agent namedCOA-Cl.COA-Cl exerted tube forming activity in human umbilical vein endothelial cells in the presence of normal human dermal fibroblasts (NHDF). We therefore explored whether and howCOA-Cl modulates gene expression and protein secretion ofVEGF, a master regulator of angiogenesis, inNHDFRT-PCRandELISArevealed thatCOA-Cl upregulatedVEGF mRNAexpression and protein secretion inNHDFHIF1α(hypoxia-inducible factor 1α), a transcription factor, andPGC-1α(peroxisome proliferator-activated receptor-γcoactivator-1α), a transcriptional coactivator, are known to positively regulate theVEGFgene. Immunoblot andRT-PCRanalyses revealed thatCOA-Cl markedly upregulated the expression ofPGC-1αprotein andmRNACOA-Cl had no effect on the expression ofHIF1αprotein andmRNAin both hypoxia and normoxia. SilencingPGC-1αgene, but notHIF1αgene, by small interferingRNAattenuated the ability ofCOA-Cl to promoteVEGFsecretion. When an N-terminal fragment ofPGC-1αwas cotransfected with its partner transcription factorERRα(estrogen-related receptor-α) inCOS-7 cells,COA-Cl upregulated the expression of the endogenousVEGF mRNA However,COA-Cl had no effect on the expression ofVEGF, whenHIF1αwas transfected.COA-Cl inducesVEGFgene expression and protein secretion in fibroblasts. The transcriptional coactivatorPGC-1α, in concert withERRα, plays a key role in theCOA-Cl-inducedVEGFproduction.COA-Cl-induced activation ofPGC-1α-ERRα-VEGFpathway has a potential as a novel means for therapeutic angiogenesis.
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Affiliation(s)
- Junsuke Igarashi
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Ryuji Okamoto
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Tetsuo Yamashita
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Takeshi Hashimoto
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Sakiko Karita
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Kozo Nakai
- Department of Dermatology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Yasuo Kubota
- Department of Dermatology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Maki Takata
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Fuminori Yamaguchi
- Department of Cell Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Masaaki Tokuda
- Department of Cell Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Norikazu Sakakibara
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Sanuki, Japan
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Ryoji Konishi
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
| | - Katsuya Hirano
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University, Kita-Gun, Japan
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da Costa PM, da Costa MP, Carvalho AA, Cavalcanti SMT, de Oliveira Cardoso MV, de Oliveira Filho GB, de Araújo Viana D, Fechine-Jamacaru FV, Leite ACL, de Moraes MO, Pessoa C, Ferreira PMP. Improvement of in vivo anticancer and antiangiogenic potential of thalidomide derivatives. Chem Biol Interact 2015; 239:174-83. [DOI: 10.1016/j.cbi.2015.06.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 06/22/2015] [Accepted: 06/26/2015] [Indexed: 11/27/2022]
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Sakakibara N, Igarashi J, Takata M, Konishi R, Suzue N, Kato Y, Maruyama T, Tsukamoto I. Design, Synthesis, and Evaluation of Novel 2-Halogenated or Aminated Carbocyclic Oxetanocin a Analogs as Potential Angiogenic Agents. HETEROCYCLES 2015. [DOI: 10.3987/com-15-13293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Sakakibara N. [Synthesis and evaluation of novel nucleic acid derivatives as bioactive substances]. YAKUGAKU ZASSHI 2014; 134:965-72. [PMID: 25174367 DOI: 10.1248/yakushi.14-00175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This review describes the synthesis and evaluation of novel nucleic acid derivatives performed by our research group to date. We developed a new method for the synthesis of 2-alkoxyadenosine analogs via nonaqueous diazotization-dediazoniation reactions. By applying these reactions, we effectively synthesized four types of carbocyclic oxetanocin analogs (2-alkoxy-C.OXT-A). The angiogenic activities of these compounds were evaluated using human umbilical vein endothelial cells. This resulted in increased activities of the analogs, especially of 2-methoxy-C.OXT-A and 2-isopropoxy-C.OXT-A, at a concentration of 100 μM; they showed angiogenic potency similar to or greater than that of vascular endothelial growth factor. We also synthesized and evaluated a novel series of uracil derivatives carrying a 3,5-dimethylbenzyl group at the N(3)-position and acting as non-nucleoside HIV-1 reverse transcriptase inhibitors. Some of these compounds showed good-to-moderate inhibitory activity, with EC₅₀ values in the submicromolar range. Among them, the analog 6-amino-1-(4-picolyl)-uracil showed significant HIV-1 reverse transcriptase inhibition, with an EC₅₀ value of 0.03 μM and a high selectivity index of 2863.
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Affiliation(s)
- Norikazu Sakakibara
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University
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Igarashi J, Hashimoto T, Kubota Y, Shoji K, Maruyama T, Sakakibara N, Takuwa Y, Ujihara Y, Katanosaka Y, Mohri S, Naruse K, Yamashita T, Okamoto R, Hirano K, Kosaka H, Takata M, Konishi R, Tsukamoto I. Involvement of S1P1 receptor pathway in angiogenic effects of a novel adenosine-like nucleic acid analog COA-Cl in cultured human vascular endothelial cells. Pharmacol Res Perspect 2014; 2:e00068. [PMID: 25505610 PMCID: PMC4186426 DOI: 10.1002/prp2.68] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 07/11/2014] [Indexed: 12/13/2022] Open
Abstract
COA-Cl (2Cl-C.OXT-A) is a recently developed adenosine-like nucleic acid analog that promotes angiogenesis via the mitogen-activated protein (MAP) kinases ERK1/2. Endothelial S1P1 receptor plays indispensable roles in developmental angiogenesis. In this study, we examined the functions of S1P1 in COA-Cl-induced angiogenic responses. Antagonists for S1P1, W146, and VPC23019, substantially but still partly inhibited the effects of COA-Cl with regard to ERK1/2 activation and tube formation in cultured human umbilical vein endothelial cells (HUVEC). Antagonists for adenosine A1 receptor and purinergic P2Y1 receptor were without effect. Genetic knockdown of S1P1 with siRNA, but not that of S1P3, attenuated COA-Cl-elicited ERK1/2 responses. The signaling properties of COA-Cl showed significant similarities to those of sphingosine 1-phosphate, an endogenous S1P1 ligand, in that both induced responses sensitive to pertussis toxin (Gα i/o inhibitor), 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid tetrakis (acetoxymethyl ester) (BAPTA-AM), (calcium chelator), and PP2 (c-Src tyrosine kinase inhibitor). COA-Cl elevated intracellular Ca2+ concentration and induced tyrosine phosphorylation of p130Cas, a substrate of c-Src, in HUVEC. COA-Cl displaced [3H]S1P in a radioligand-binding competition assay in chem-1 cells overexpressing S1P1. However, COA-Cl activated ERK1/2 in CHO-K1 cells that lack functional S1P1 receptor, suggesting the presence of additional yet-to-be-defined COA-Cl target in these cells. The results thus suggest the major contribution of S1P1 in the angiogenic effects of COA-Cl. However, other mechanism such as that seen in CHO-K1 cells may also be partly involved. Collectively, these findings may lead to refinement of the design of this nucleic acid analog and ultimately to development of small molecule-based therapeutic angiogenesis.
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Affiliation(s)
- Junsuke Igarashi
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Takeshi Hashimoto
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Yasuo Kubota
- Department of Dermatology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Kazuyo Shoji
- Department of Dermatology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Tokumi Maruyama
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University 1314-1 Shido, Sanuki, Kagawa, 769-2193, Japan
| | - Norikazu Sakakibara
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University 1314-1 Shido, Sanuki, Kagawa, 769-2193, Japan
| | - Yoh Takuwa
- Department of Cardiovascular Physiology, Kanazawa University School of Medicine 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Yoshihiro Ujihara
- Department of Physiology, Kawasaki Medical School 577 Matsushima, Kurashiki, 701-0192, Japan
| | - Yuki Katanosaka
- Department of Cardiovascular Physiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Shitada-Cho 2-5-1, Kita-Ku, Okayama, 700-0914, Japan
| | - Satoshi Mohri
- Department of Physiology, Kawasaki Medical School 577 Matsushima, Kurashiki, 701-0192, Japan
| | - Keiji Naruse
- Department of Cardiovascular Physiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Shitada-Cho 2-5-1, Kita-Ku, Okayama, 700-0914, Japan
| | - Tetsuo Yamashita
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Ryuji Okamoto
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Katsuya Hirano
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Hiroaki Kosaka
- Department of Cardiovascular Physiology, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Maki Takata
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Ryoji Konishi
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan
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Igarashi J, Hashimoto T, Shoji K, Yoneda K, Tsukamoto I, Moriue T, Kubota Y, Kosaka H. Dexamethasone induces caveolin-1 in vascular endothelial cells: implications for attenuated responses to VEGF. Am J Physiol Cell Physiol 2013; 304:C790-800. [DOI: 10.1152/ajpcell.00268.2012] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Steroids exert direct actions on cardiovascular cells, although underlying molecular mechanisms remain incompletely understood. We examined if steroids modulate abundance of caveolin-1, a regulatory protein of cell-surface receptor pathways that regulates the magnitudes of endothelial response to vascular endothelial growth factor (VEGF). Dexamethasone, a synthetic glucocorticoid, induces caveolin-1 at both levels of protein and mRNA in a time- and dose-dependent manner in pharmacologically relevant concentrations in cultured bovine aortic endothelial cells. Aldosterone, a mineralocorticoid, but not the sex steroids 17β-estradiol, testosterone, or progesterone, elicits similar caveolin-1 induction. Caveolin-1 induction by dexamethasone and that by aldosterone were abrogated by RU-486, an inhibitor of glucocorticoid receptor, and by spironolactone, a mineralocorticoid receptor inhibitor, respectively. Dexamethasone attenuates VEGF-induced responses at the levels of protein kinases Akt and ERK1/2, small-G protein Rac1, nitric oxide production, and migration. When induction of caveolin-1 by dexamethasone is attenuated either by genetically by transient transfection with small interfering RNA or pharmacologically by RU-486, kinase responses to VEGF are rescued. Dexamethasone also increases expression of caveolin-1 protein in cultured human umbilical vein endothelial cells, associated with attenuated tube formation responses of these cells when cocultured with normal fibroblasts. Immunohistochemical analyses revealed that intraperitoneal injection of dexamethasone induces endothelial caveolin-1 protein in thoracic aorta and in lung artery in healthy male rats. Thus steroids functionally attenuate endothelial responses to VEGF via caveolin-1 induction at the levels of signal transduction, migration, and tube formation, identifying a novel point of cross talk between nuclear and cell-surface receptor signaling pathways.
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Affiliation(s)
- Junsuke Igarashi
- Department of Cardiovascular Physiology, Kagawa University, Kagawa, Japan
| | - Takeshi Hashimoto
- Department of Cardiovascular Physiology, Kagawa University, Kagawa, Japan
| | - Kazuyo Shoji
- Department of Dermatology, Kagawa University, Kagawa, Japan; and
| | - Kozo Yoneda
- Department of Dermatology, Kagawa University, Kagawa, Japan; and
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Tetsuya Moriue
- Department of Dermatology, Kagawa University, Kagawa, Japan; and
| | - Yasuo Kubota
- Department of Dermatology, Kagawa University, Kagawa, Japan; and
| | - Hiroaki Kosaka
- Department of Cardiovascular Physiology, Kagawa University, Kagawa, Japan
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Okabe N, Nakamura E, Himi N, Narita K, Tsukamoto I, Maruyama T, Sakakibara N, Nakamura T, Itano T, Miyamoto O. Delayed administration of the nucleic acid analog 2Cl-C.OXT-A attenuates brain damage and enhances functional recovery after ischemic stroke. Brain Res 2013; 1506:115-31. [DOI: 10.1016/j.brainres.2013.02.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 02/06/2013] [Accepted: 02/06/2013] [Indexed: 01/28/2023]
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Maruyama T, Sakakibara N, Tsukamoto I, Isono Y, Takata M, Konishi R, Kato Y. A New Method for Synthesis and Angiogenic Evaluation of Leteprinim Potassium and Its Novel Analogs. HETEROCYCLES 2013. [DOI: 10.3987/com-13-12824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Maruyama T, Sakakibara N, Tsukamoto I, Tsuruta T, Takata M, Konishi R. Novel Synthesis of Carbocyclic Oxetanocin Analogs (2-Alkoxy-C.OXT-A) and Their Tube Formation Activities of Human Umbilical Vein Endothelial Cells (HUVEC). HETEROCYCLES 2012. [DOI: 10.3987/com-12-12441] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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