1
|
Chelpuri Y, Pabbathi S, Alla GR, Yadala RK, Kamishetti M, Banothu AK, Boinepally R, Bharani KK, Khurana A. Tropolone derivative hinokitiol ameliorates cerulein-induced acute pancreatitis in mice. Int Immunopharmacol 2022; 109:108915. [PMID: 35679663 DOI: 10.1016/j.intimp.2022.108915] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 05/25/2022] [Accepted: 05/29/2022] [Indexed: 11/17/2022]
Abstract
Hinokitiol is a natural bio-active tropolone derivative with promising antioxidant and anti-inflammatory properties. This study was conducted to evaluate the ameliorative effects of hinokitiol against acute pancreatitis induced by cerulein. Mice were pre-treated with hinokitiol intraperitoneally for 7 days (50 and 100 mg/kg), and on the final day of study, cerulein (6 × 50 μg/kg) was injected every hour for six times. Six hours after the last dose of cerulein, blood was collected from the mice through retro-orbital plexus for biochemical analysis. After blood collection, mice were euthanized and the pancreas was harvested for studying effects on oxidative stress, pro-inflammatory cytokines, immunohistochemistry and histopathology of tissue sections. Hinokitiol treatment significantly reduced edema of the pancreas and reduced the plasma levels of lipase and amylase in mice with cerulein-induced acute pancreatitis. It also attenuated the oxidative and nitrosative stress related damage as evident from the reduced malondialdehyde (MDA) and nitrite levels, which were significantly increased in the mice with acute pancreatitis. Furthermore, hinokitiol administration significantly reduced the pancreatitis-evoked decrease in the activity of catalase, glutathione (GSH) and superoxide dismutase (SOD) in the pancreatic tissue. Pre-treatment with hinokitiol significantly reduced the elevated levels of pro-inflammatory cytokines like interleukin-6 (IL-6), interleukin-1β (IL-1β), tumor necrosis factor-alpha (TNF-α) as well as increased the levels of anti-inflammatory cytokine interleukin-10 (IL-10) in the pancreatic tissue of mice with acute pancreatitis. The immunohistochemical expression of nuclear factor kappa light chain enhancer of activated B cells (NF-κB), cyclooxygenase (COX-2) and TNF-α were significantly decreased by hinokitiol in mice with cerulein-induced acute pancreatitis. In conclusion, the results of the present study demonstrate that hinokitiol has significant potential to prevent cerulein-induced acute pancreatitis.
Collapse
Affiliation(s)
- Yamini Chelpuri
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India
| | - Shivakumar Pabbathi
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India
| | - Gopala Reddy Alla
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India
| | - Ravi Kumar Yadala
- Department of Veterinary Pathology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India
| | - Mounika Kamishetti
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India
| | - Anil Kumar Banothu
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India.
| | - Ramya Boinepally
- Department of Veterinary Pathology, Veterinary Clinical Complex, College of Veterinary Science (CVSc), Warangal 506166, PVNRTVU, Telangana, India
| | - Kala Kumar Bharani
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Warangal 506166, PVNRTVU, Telangana, India
| | - Amit Khurana
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Rajendranagar, Hyderabad 500030, PVNRTVU, Telangana, India; Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science (CVSc), Warangal 506166, PVNRTVU, Telangana, India; Centre for Biomedical Engineering (CBME), Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi 110016, India.
| |
Collapse
|
2
|
Silva FT, Espósito BP. Intracellular Iron Binding and Antioxidant Activity of Phytochelators. Biol Trace Elem Res 2022; 200:3910-3918. [PMID: 34648123 DOI: 10.1007/s12011-021-02965-y] [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: 09/14/2021] [Accepted: 10/07/2021] [Indexed: 11/28/2022]
Abstract
Phytochelators have been studied as templates for designing new drugs for chelation therapy. This work evaluated key chemical and biological properties of five candidate phytochelators for iron overload diseases: maltol, mimosine, morin, tropolone, and esculetin. Intra- and extracellular iron affinity and antioxidant activity, as well as the ability to scavenge iron from holo-transferrin, were studied in physiologically relevant settings. Tropolone and mimosine (and, to a lesser extent, maltol) presented good binding capacity for iron, removing it from calcein, a high-affinity fluorescent probe. Tropolone and mimosine arrested iron-mediated oxidation of ascorbate with the same efficiency as the standard iron chelator DFO. Also, both were cell permeant and able to access labile pools of iron in HeLa and HepG2 cells. Mimosine was an effective antioxidant in cells stressed by iron and peroxide, being as efficient as the cell-permeant iron chelator deferiprone. These results reinforce the potential of those molecules, especially mimosine, as adjuvants in treatments for iron overload.
Collapse
Affiliation(s)
- Fredson Torres Silva
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, São Paulo, SP, Brazil
| | - Breno Pannia Espósito
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, São Paulo, SP, Brazil.
| |
Collapse
|
3
|
Wang Y, Yang Q, Fu Z, Sun P, Zhang T, Wang K, Li X, Qian Y. Hinokitiol inhibits RANKL-induced osteoclastogenesis in vitro and prevents ovariectomy-induced bone loss in vivo. Int Immunopharmacol 2021; 96:107619. [PMID: 33831806 DOI: 10.1016/j.intimp.2021.107619] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/25/2021] [Accepted: 03/25/2021] [Indexed: 01/11/2023]
Abstract
Osteoporosis is a metabolic bone-loss disease characterized by abnormally excessive osteoclast formation and bone resorption. Identification of natural medicines that can inhibit osteoclastogenesis, bone resorption, and receptor activator of nuclear factor-κB ligand (RANKL)-induced signaling is necessary for improved treatment of osteoporosis. In this study, hinokitiol, a tropolone-related compound extracted from the heart wood of several cupressaceous plants, was found to inhibit RANKL-induced osteoclast formation and bone resorption in vitro. Hinokitiol inhibited early activation of the ERK, p38, and JNK-MAPK pathways, thereby suppressing the activity and expression of downstream factors (c-Jun, c-Fos, and NFATC1). Consistent with the above in vitro findings, hinokitiol treatment protected against ovariectomy-induced bone loss in vivo. Collectively, our results imply that hinokitiol can potentially serve as an effective agent for treating osteoclast-induced osteoporosis.
Collapse
Affiliation(s)
- Yanben Wang
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China; Department of Orthopedics, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, China
| | - Qichang Yang
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China; The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, China
| | - Ziyuan Fu
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China; Department of Orthopedics, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, China
| | - Peng Sun
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China; The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, China
| | - Tan Zhang
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China
| | - Kelei Wang
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China; Department of Orthopedics, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, China
| | - Xinyu Li
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China; Department of Orthopedics, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, China
| | - Yu Qian
- Department of Orthopedics, Shaoxing Hospital, Zhejiang University School of Medicine, Shaoxing, Zhejiang 312000, China.
| |
Collapse
|
4
|
Isono T, Domon H, Nagai K, Maekawa T, Tamura H, Hiyoshi T, Yanagihara K, Kunitomo E, Takenaka S, Noiri Y, Terao Y. Treatment of severe pneumonia by hinokitiol in a murine antimicrobial-resistant pneumococcal pneumonia model. PLoS One 2020; 15:e0240329. [PMID: 33057343 PMCID: PMC7561173 DOI: 10.1371/journal.pone.0240329] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 09/23/2020] [Indexed: 12/27/2022] Open
Abstract
Streptococcus pneumoniae is often isolated from patients with community-acquired pneumonia. Antibiotics are the primary line of treatment for pneumococcal pneumonia; however, rising antimicrobial resistance is becoming more prevalent. Hinokitiol, which is isolated from trees in the cypress family, has been demonstrated to exert antibacterial activity against S. pneumoniae in vitro regardless of antimicrobial resistance. In this study, the efficacy of hinokitiol was investigated in a mouse pneumonia model. Male 8-week-old BALB/c mice were intratracheally infected with S. pneumoniae strains D39 (antimicrobial susceptible) and NU4471 (macrolide resistant). After 1 h, hinokitiol was injected via the tracheal route. Hinokitiol significantly decreased the number of S. pneumoniae in the bronchoalveolar lavage fluid (BALF) and the concentration of pneumococcal DNA in the serum, regardless of whether bacteria were resistant or susceptible to macrolides. In addition, hinokitiol decreased the infiltration of neutrophils in the lungs, as well as the concentration of inflammatory cytokines in the BALF and serum. Repeated hinokitiol injection at 18 h intervals showed downward trend in the number of S. pneumoniae in the BALF and the concentration of S. pneumoniae DNA in the serum with the number of hinokitiol administrations. These findings suggest that hinokitiol reduced bacterial load and suppressed excessive host immune response in the pneumonia mouse model. Accordingly, hinokitiol warrants further exploration as a potential candidate for the treatment of pneumococcal pneumonia.
Collapse
Affiliation(s)
- Toshihito Isono
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Hisanori Domon
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Research Center for Advanced Oral Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Kosuke Nagai
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Tomoki Maekawa
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Research Center for Advanced Oral Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Division of Periodontology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Hikaru Tamura
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Research Center for Advanced Oral Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Division of Periodontology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Takumi Hiyoshi
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Division of Periodontology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Katsunori Yanagihara
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Eiji Kunitomo
- Central Research and Development Laboratory, Kobayashi Pharmaceutical Co., Ltd., Osaka, Japan
| | - Shoji Takenaka
- Division of Cariology, Operative Dentistry and Endodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Yuichiro Noiri
- Division of Cariology, Operative Dentistry and Endodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Yutaka Terao
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Research Center for Advanced Oral Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- * E-mail:
| |
Collapse
|
5
|
Yang HW, Lu MY, Chiu YW, Liao YW, Huang YF, Ju Chueh P, Hsieh PL, Yu CC. Hinokitiol ablates myofibroblast activation in precancerous oral submucous fibrosis by targeting Snail. Environ Toxicol 2018; 33:454-462. [PMID: 29328529 DOI: 10.1002/tox.22531] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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: 11/20/2017] [Revised: 12/27/2017] [Accepted: 12/27/2017] [Indexed: 06/07/2023]
Abstract
Oral submucous fibrosis (OSF) is a precancerous condition with symptoms of limited mouth opening and areca nut chewing habit has been implicated in its pathogenesis. Hinokitiol, a natural tropolone derived from Chamacyparis taiwanensis, has been reported to improve oral lichen planus and inhibit various cancer cells. Here, we showed that hinokitiol reduced the myofibroblast activities in fBMFs and prevented the arecoline-induced transdifferentiation. Treatment of hinokitiol dose-dependently downregulated the myofibroblast markers as well as various EMT transcriptional factors. In particular, we identified that Snail was able to bind to the E-box in the α-SMA promoter. Our data suggested that exposure of fBMFs to hinokitiol mitigated the hallmarks of myofibroblasts, while overexpression of Snail eliminated the effect of hinokitiol. These findings revealed that the inhibitory effect of hinokitiol on myofibroblasts was mediated by repression of α-SMA via regulation of Snail and showed the anti-fibrotic potential of hinokitiol in the treatment of OSF.
Collapse
Affiliation(s)
- Hui-Wen Yang
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Ming-Yi Lu
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Yu-Wei Chiu
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Yi-Wen Liao
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
| | - Yu-Feng Huang
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Pin Ju Chueh
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Pei-Ling Hsieh
- Institute of Oral Sciences, Chung Shan Medical University, Taichung, Taiwan
| | - Cheng-Chia Yu
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
- Institute of Oral Sciences, Chung Shan Medical University, Taichung, Taiwan
| |
Collapse
|
6
|
Zhang L, Peng Y, Uray IP, Shen J, Wang L, Peng X, Brown PH, Tu W, Peng G. Natural product β-thujaplicin inhibits homologous recombination repair and sensitizes cancer cells to radiation therapy. DNA Repair (Amst) 2017; 60:89-101. [PMID: 29112893 DOI: 10.1016/j.dnarep.2017.10.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 10/23/2017] [Indexed: 12/27/2022]
Abstract
Investigation of natural products is an attractive strategy to identify novel compounds for cancer prevention and treatment. Numerous studies have shown the efficacy and safety of natural products, and they have been widely used as alternative treatments for a wide range of illnesses, including cancers. However, it remains unknown whether natural products affect homologous recombination (HR)-mediated DNA repair and whether these compounds can be used as sensitizers with minimal toxicity to improve patients' responses to radiation therapy, a mainstay of treatment for many human cancers. In this study, in order to systematically identify natural products with an inhibitory effect on HR repair, we developed a high-throughput image-based HR repair screening assay and screened a chemical library containing natural products. Among the most interesting of the candidate compounds identified from the screen was β-thujaplicin, a bioactive compound isolated from the heart wood of plants in the Cupressaceae family, can significantly inhibit HR repair. We further demonstrated that β-thujaplicin inhibits HR repair by reducing the recruitment of a key HR repair protein, Rad51, to DNA double-strand breaks. More importantly, our results showed that β-thujaplicin can radiosensitize cancer cells. Additionally, β-thujaplicin sensitizes cancer cells to PARP inhibitor in different cancer cell lines. Collectively, our findings for the first time identify natural compound β-thujaplicin, which has a good biosafety profile, as a novel HR repair inhibitor with great potential to be translated into clinical applications as a sensitizer to DNA-damage-inducing treatment such as radiation and PARP inhibitor. In addition, our study provides proof of the principle that our robust high-throughput functional HR repair assay can be used for a large-scale screening system to identify novel natural products that regulate DNA repair and cellular responses to DNA damage-inducing treatments such as radiation therapy.
Collapse
Affiliation(s)
- Lihong Zhang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Yang Peng
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Ivan P Uray
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX, USA; Department of Clinical Oncology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
| | - Jianfeng Shen
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Lulu Wang
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Xiangdong Peng
- Department of Pharmacy, Third Xiangya Hospital, Central South University, Changsha, China.
| | - Powel H Brown
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Wei Tu
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Guang Peng
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| |
Collapse
|
7
|
Wang WK, Lin ST, Chang WW, Liu LW, Li TYT, Kuo CY, Hsieh JL, Lee CH. Hinokitiol induces autophagy in murine breast and colorectal cancer cells. Environ Toxicol 2016; 31:77-84. [PMID: 25044443 DOI: 10.1002/tox.22023] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [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: 03/16/2014] [Revised: 06/25/2014] [Accepted: 06/29/2014] [Indexed: 06/03/2023]
Abstract
Hinokitiol is found in the heartwood of cupressaceous plants and possesses several biological activities. Hinokitiol may play an important role in anti-inflammation and antioxidant processes, making it potentially useful in therapies for inflammatory-mediated disease. Previously, the suppression of tumor growth by hinokitiol has been shown to occur through apoptosis. Programmed cell death can also occur through autophagy, but the mechanism of hinokitiol-induced autophagy in tumor cells is poorly defined. We used an autophagy inhibitor (3-methyladenine) to demonstrate that hinokitiol can induce cell death via an autophagic pathway. Further, we suggest that hinokitiol induces autophagy in a dose-dependent manner. Markers of autophagy were increased after tumor cells were treated with hinokitiol. In addition, immunoblotting revealed that the levels of phosphoprotein kinase B (P-AKT), phosphomammalian target of rapamycin (P-mTOR), and phospho-p70 ribosomal s6 kinase (P-p70S6K) in tumor cells were decreased after hinokitiol treatment. In conclusion, our results indicate that hinokitiol induces the autophagic signaling pathway via downregulation of the AKT/mTOR pathway. Therefore, our findings show that hinokitiol may control tumor growth by inducing autophagic signaling.
Collapse
Affiliation(s)
- Wei-Kuang Wang
- Department of Environmental Engineering and Science, Feng Chia University, Taichung, Taiwan
| | - Song-Tao Lin
- Department of Microbiology, School of Medicine, China Medical University, Taichung, Taiwan
| | - Wen-Wei Chang
- Department of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University, Taichung, Taiwan
- Department of Medical Research, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Li-Wen Liu
- Division of Gene Therapy Science, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Tom Yu-Tung Li
- Division of Gene Therapy Science, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Chun-Yu Kuo
- Department of Microbiology, School of Medicine, China Medical University, Taichung, Taiwan
| | - Jeng-Long Hsieh
- Department of Nursing, Chung Hwa University of Medical Technology, Tainan, Taiwan
| | - Che-Hsin Lee
- Department of Microbiology, School of Medicine, China Medical University, Taichung, Taiwan
| |
Collapse
|
8
|
Nakano Y, Matsuo S, Tani H, Sasai K, Baba E. Therapeutic Effects of .BETA.-Thujaplicin Eardrops on Canine Malassezia-Related Otitis Externa. J Vet Med Sci 2006; 68:373-4. [PMID: 16679729 DOI: 10.1292/jvms.68.373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
An eardrop solution of beta-thujaplicin was examined for therapeutic effects on canine Malassezia-related otitis externa. Half to one ml of beta-thujaplicin solution of 100 microg/ml including DMSO 2% was injected everyday into both external ear canals of 31 cases for test-of-cure agreement. Fifteen score phases were established from the symptoms and cerumen smear biopsy findings, and score changes were recorded at least once a week. The means of the second and the third inspection day scores decreased significantly more than the previous value of each. In addition, the numbers of yeast-like organisms clearly decreased. These results suggest that beta-thujaplicin eardrops are effective for Malassezia-related otitis externa in dogs.
Collapse
Affiliation(s)
- Yasuyuki Nakano
- Department of Veterinary Clinical Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Japan
| | | | | | | | | |
Collapse
|
9
|
Abstract
Antiplasmodial and cytotoxicity testing of five highly oxygenated natural products (6R,12R,14R-colletoketol, 6R,11R,12R,14R-colletoketodiol, dihydrobotrydial, pycnidione, and 3R,4S-hydroxymellein), all derived from fungi of marine origin, showed one of them, pycnidione, to have activities against three different strains of Plasmodium falciparum in the sub-micromolar (microM) range. Although the mean selectivity index of 1 for the observed antiplasmodial activity of 4 is low, pycnidione's usefulness as a potential lead structure should not be ignored.
Collapse
Affiliation(s)
- Anthony D Wright
- Australian Institute of Marine Science, Townsville MC, Queensland 4810, Australia.
| | | |
Collapse
|
10
|
Nakano Y, Wada M, Tani H, Sasai K, Baba E. Effects of .BETA.-Thujaplicin on Anti-Malassezia pachydermatis Remedy for Canine Otitis Externa. J Vet Med Sci 2005; 67:1243-7. [PMID: 16397383 DOI: 10.1292/jvms.67.1243] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The antifungal activity of beta-thujaplicin was evaluated against 51 Malassezia pachydermatis strains isolated from canine ear canals with or without otitis externa. For comparison, sensitivity tests were performed on M. pachydermatis isolates for nystatin, ketoconazole, and terbinafine HCl, all clinically available antifungal agents. The minimal inhibition concentrations over 50% of the tested isolates (MIC50) were 3.13 microg/ml for beta-thujaplicin and nystatin, 0.016 microg/ml for ketoconazole, and 1.56 microg/ml for terbinafine HCl. The antifungal effect for M. pachydermatis of beta-thujaplicin compared favorably with commercial antifungal agents. None of the 51 M. pachydermatis isolates showed resistance against any of the tested antibiotics investigated in this study. Ten representative isolates of M. pachydermatis were subcultured for 30 generations at concentrations close to the MIC levels of beta-thujaplicin, nystatin, ketoconazole, and terbinafine HCl, and examined to determine whether they had acquired resistance to each drug. As a result, M. pachydermatis was found to achieve resistance more easily for ketoconazole and terbinafine HCl than for beta-thujaplicin or nystatin. The MIC50 of beta-thujaplicin did not change during the course of subculture, and it is thought that the potential development of a resistant strain is low, even with continuous infusion for otitis externa therapy. beta-Thujaplicin is an inexpensive and safe treatment with anti-inflammatory and deodorant effects that can be recommended as an effective remedy for canine otitis externa.
Collapse
Affiliation(s)
- Yasuyuki Nakano
- Department of Veterinary Clinical Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan
| | | | | | | | | |
Collapse
|
11
|
Arima Y, Nakai Y, Hayakawa R, Nishino T. Antibacterial effect of beta-thujaplicin on staphylococci isolated from atopic dermatitis: relationship between changes in the number of viable bacterial cells and clinical improvement in an eczematous lesion of atopic dermatitis. J Antimicrob Chemother 2003; 51:113-22. [PMID: 12493795 DOI: 10.1093/jac/dkg037] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Beta-thujaplicin (hinokitiol) is a tropolone-related compound purified from the wood of Chamaecyparis obtusa, SIEB: et Zucc. and Thuja plicata D. Don. All Staphylococcus aureus isolates were inhibited by beta-thujaplicin with MICs of 1.56-3.13 mg/L. However, a paradoxical zone phenomenon occurred, with each isolate producing regrowth at higher beta-thujaplicin concentrations. Other antimicrobial agents showed a wide range of MICs. The combination of beta-thujaplicin and zinc oxide inhibited the paradoxical zone phenomenon, and enhanced killing activity against clinically isolated staphylococci. Large numbers of viable bacterial cells, especially S. aureus cells, were detected in the skin surface of atopic dermatitis, in comparison with those in healthy volunteers. The number of cells increased as the severity of the skin condition worsened. Topical application of beta-thujaplicin resulted in a reduction in the number of bacterial cells on the skin surface, and an improvement in skin condition after treatment. The results of this study suggest that the degree of reduction in the number of viable bacterial cells in an eczematous lesion of atopic dermatitis is related to the degree of improvement in skin condition.
Collapse
Affiliation(s)
- Yaeno Arima
- Department of Microbiology, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan.
| | | | | | | |
Collapse
|
12
|
Ito C, Im WB, Takagi H, Takahashi M, Tsuzuki K, Liou SY, Kunihara M. U-92032, a T-type Ca2+ channel blocker and antioxidant, reduces neuronal ischemic injuries. Eur J Pharmacol 1994; 257:203-10. [PMID: 8088342 DOI: 10.1016/0014-2999(94)90130-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Several diphenylmethylpiperazine derivatives are potential therapeutic agents for prevention of ischemic injuries in the heart and brain, because of their ability to block Ca2+ currents and their antioxidant activity. In this study, the current lead compound, U-92032 ((7-((bis-4-fluorophenyl)methyl)-1-piperazinyl)-2-(2-hydroxyethylamin o)- 4-(1-methylethyl)-2,4,6-cycloheptatrien-1-one), has been compared with flunarizine and nifedipine (well-known T- and L-type Ca2+ channel antagonists, respectively) for their effects on Ca2+ channels in a mouse neuronal cell line, N1E-115 cells, and their ability to preserve the phenomenon of long-term potentiation and to improve neurological symptoms in gerbil ischemic models. U-92032, like flunarizine, blocked transient Ba2+ currents (IBa) through T-type Ca2+ channels with no effect on nifedipine-sensitive non-inactivating currents. Transient IBa was reduced by U-92032 at a constant rate, the magnitude of which depended on the drug concentration, probably because of a time-dependent accumulation of the lipophilic drug in the membrane phase. For instance, the drug at 6 microM reduced IBa by 21% per min and abolished it in less than 5 min, about 3 times faster than flunarizine at the same concentration. Otherwise, U-92032 behaved like flunarizine, showing a use-dependent block without noticeable effects on the current-voltage relationship for transient IBa. Oral administration of U-92032 (1 and 25 mg/kg) or flunarizine (25 mg/kg), but not nifedipine (50 mg/kg), to gerbils 1 h prior to bilateral carotid artery occlusion, preserved long-term potentiation in hippocampal CA1 neurons, which were largely abolished by ischemia without the drug treatment.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- C Ito
- Upjohn Tsukuba Laboratory, Japan
| | | | | | | | | | | | | |
Collapse
|
13
|
Yamato M, Hashigaki K, Yasumoto Y, Sakai J, Luduena RF, Banerjee A, Tsukagoshi S, Tashiro T, Tsuruo T. Synthesis and antitumor activity of tropolone derivatives. 6. Structure-activity relationships of antitumor-active tropolone and 8-hydroxyquinoline derivatives. J Med Chem 1987; 30:1897-900. [PMID: 3116257 DOI: 10.1021/jm00393a035] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The bis derivative 6 of 8-hydroxyquinoline, which, like tropolones, readily forms a chelate, was synthesized and found to have high potency (dose = 12.5 mg/kg, T/C % = 164) against leukemia P388 in mice approximately equivalent to that of the bistropolone 1b. 8-Hydroxyquinoline analogues with broad structural variation were synthesized and their structure-activity relationships followed the same pattern as in the tropolone series. In addition, the bistropolones 1a-e were tested for their ability to bind to tubulin and found to have no such property. The results of this study suggested that bistropolone and bis(8-hydroxyquinoline) derivatives must form a chelate with the metal necessary for the enzyme, such as ribonucleotide reductase, which catalyzes the DNA biosynthetic pathways.
Collapse
Affiliation(s)
- M Yamato
- Faculty of Pharmaceutical Sciences, Okayama University, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Watanabe H, Watanabe N, Kojima H, Suzuki M, Watanabe I, Mizuno K. [A clinical re-evaluation of an Hinoporon on periodontal disease using the double blind method]. Aichi Gakuin Daigaku Shigakkai Shi 1987; 25:133-43. [PMID: 3331890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
15
|
Abstract
Modifications of monotropolone 2 having poor potency against P388 in mice were studied. The alpha-ethoxy group of 2, prepared from hinokitiol and benzaldehyde diethyl acetal, was replaced with a phenolic or heteroaromatic compound by heating 2 with the appropriate nucleophile. Structure-activity relationships indicated that an acidic hydroxyl and a proton-accepting group situated in the neighboring position, which permits the formation of a chelate with a metal ion, contributed to enhanced activity. Among the compounds studied, the 8-hydroxyquinoline analogue 10f was the most favorable compound.
Collapse
|
16
|
Abstract
As part of a study on the antitumor activities of tropolone derivatives prepared from hinokitiol, which naturally occurs in the plants of Chamaecyparis species, effects of aromatic substituents of alpha,alpha-bis(7-hydroxy-5-isopropyltropon-2-yl)toluenes on the activity were examined. Several of the compounds showed high potency in the P388 leukemia assay. 4-Hydroxy analogue 4d showed the most potent activity (T/C = 195%) at a 5 mg/kg dose. The introduction of large-size substituents, of which the steric influence prevents coplanarity of the substituted aromatic function, resulted in a remarkable decrease in the potency. X-ray structural analysis of highly potent 4-methoxy analogue 4b was undertaken.
Collapse
|
17
|
Kimura K, Sato H, Kusunoki M, Fujimaki I, Watanabe K. [Clinical evaluation of XP-SN on periodontal disease using double-blind method at multiple institutions (author's transl)]. Nihon Shishubyo Gakkai Kaishi 1977; 19:413-30. [PMID: 288812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|