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Chang JC, Chang HS, Chao YC, Huang CS, Lin CH, Wu ZS, Chang HJ, Liu CS, Chuang CS. Formoterol Acting via β2-Adrenoreceptor Restores Mitochondrial Dysfunction Caused by Parkinson's Disease-Related UQCRC1 Mutation and Improves Mitochondrial Homeostasis Including Dynamic and Transport. Biology (Basel) 2024; 13:231. [PMID: 38666843 PMCID: PMC11048601 DOI: 10.3390/biology13040231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 03/22/2024] [Accepted: 03/27/2024] [Indexed: 04/28/2024]
Abstract
Formoterol, a β2-adrenergic receptor (β2AR) agonist, shows promise in various diseases, but its effectiveness in Parkinson's disease (PD) is debated, with unclear regulation of mitochondrial homeostasis. This study employed a cell model featuring mitochondrial ubiquinol-cytochrome c reductase core protein 1 (UQCRC1) variants associated with familial parkinsonism, demonstrating mitochondrial dysfunction and dynamic imbalance, exploring the therapeutic effects and underlying mechanisms of formoterol. Results revealed that 24-h formoterol treatment enhanced cell proliferation, viability, and neuroprotection against oxidative stress. Mitochondrial function, encompassing DNA copy number, repatriation, and complex III-linked respiration, was comprehensively restored, along with the dynamic rebalance of fusion/fission events. Formoterol reduced extensive hypertubulation, in contrast to mitophagy, by significantly upregulating protein Drp-1, in contrast to fusion protein Mfn2, mitophagy-related protein Parkin. The upstream mechanism involved the restoration of ERK signaling and the inhibition of Akt overactivity, contingent on the activation of β2-adrenergic receptors. Formoterol additionally aided in segregating healthy mitochondria for distribution and transport, therefore normalizing mitochondrial arrangement in mutant cells. This study provides preliminary evidence that formoterol offers neuroprotection, acting as a mitochondrial dynamic balance regulator, making it a promising therapeutic candidate for PD.
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Affiliation(s)
- Jui-Chih Chang
- Center of Regenerative Medicine and Tissue Repair, Institute of ATP, Changhua Christian Hospital, Changhua 500, Taiwan
| | - Huei-Shin Chang
- Center of Regenerative Medicine and Tissue Repair, Institute of ATP, Changhua Christian Hospital, Changhua 500, Taiwan
| | - Yi-Chun Chao
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua 500, Taiwan
| | - Ching-Shan Huang
- Center of Regenerative Medicine and Tissue Repair, Institute of ATP, Changhua Christian Hospital, Changhua 500, Taiwan
| | - Chin-Hsien Lin
- Department of Neurology, National Taiwan University Hospital, Taipei 100, Taiwan
| | - Zhong-Sheng Wu
- Department of General Research Laboratory of Research, Changhua Christian Hospital, Changhua 500, Taiwan
| | - Hui-Ju Chang
- Center of Regenerative Medicine and Tissue Repair, Institute of ATP, Changhua Christian Hospital, Changhua 500, Taiwan
| | - Chin-San Liu
- Department of Neurology, Changhua Christian Hospital, Changhua 500, Taiwan
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 500, Taiwan
- Graduate Institute of Integrated Medicine, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan
- College of Medicine, National Chung Hsing University, Taichung 402, Taiwan
| | - Chieh-Sen Chuang
- Department of Neurology, Changhua Christian Hospital, Changhua 500, Taiwan
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Tian H, Chao YC, Hu J, Song YL. [Immunotherapy advances for lung cancer combined with chronic obstructive pulmonary disease]. Zhonghua Jie He He Hu Xi Za Zhi 2024; 47:70-74. [PMID: 38062699 DOI: 10.3760/cma.j.cn112147-20230905-00142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/30/2023]
Abstract
Lung cancer is a major public health problem worldwide, with high rates of morbidity and mortality. It often coexists with chronic obstructive pulmonary disease (COPD), the diagnosis and management of which often receives insufficient attention. In particular, the presence of COPD has significant implications for the clinical management of lung cancer patients. This review systematically assesses the influence of COPD on the efficacy of immunotherapy and the occurrence of immune-related adverse events in patients with lung cancer, identifies existing challenges and proposes avenues for future research in this field.
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Affiliation(s)
- H Tian
- Department of Pulmonary and Critical Care Medicine, Zhongshan Hospital Fudan University, Shanghai 200032, China
| | - Y C Chao
- Department of Pulmonary and Critical Care Medicine, Zhongshan Hospital Fudan University, Shanghai 200032, China
| | - J Hu
- Department of Pulmonary and Critical Care Medicine, Zhongshan Hospital Fudan University, Department of Pulmonary and Critical Care Medicine, Shanghai Geriatric Medical Center, Shanghai 201100, China
| | - Y L Song
- Department of Pulmonary and Critical Care Medicine, Zhongshan Hospital Fudan University, Shanghai Institute of Infectious Disease and Biosecurity, Key Laboratory of Chemical Injury, Emergency and Critical Medicine of Shanghai Municipal Health Commission, Center of Emergency and Critical Medicine, Jinshan Hospital of Fudan University, Shanghai 201508, China
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Lee KY, Yang CC, Shueng PW, Wu SM, Chen CH, Chao YC, Chang YC, Han CL, Chuang HC, Lee CC, Lin CW. Downregulation of TAZ elicits a mitochondrial redox imbalance and ferroptosis in lung epithelial cells exposed to diesel exhaust particles. Ecotoxicol Environ Saf 2023; 266:115555. [PMID: 37832483 DOI: 10.1016/j.ecoenv.2023.115555] [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] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/26/2023] [Accepted: 10/05/2023] [Indexed: 10/15/2023]
Abstract
Mitochondrial dysfunction was reported to be involved in the development of lung diseases including chronic obstructive pulmonary disease (COPD). However, molecular regulation underlying metabolic disorders in the airway epithelia exposed to air pollution remains unclear. In the present study, lung bronchial epithelial BEAS-2B and alveolar epithelial A549 cells were treated with diesel exhaust particles (DEPs), the primary representative of ambient particle matter. This treatment elicited cell death accompanied by induction of lipid reactive oxygen species (ROS) production and ferroptosis. Lipidomics analyses revealed that DEPs increased glycerophospholipid contents. Accordingly, DEPs upregulated expression of the electron transport chain (ETC) complex and induced mitochondrial ROS production. Mechanistically, DEP exposure downregulated the Hippo transducer transcriptional co-activator with PDZ-binding motif (TAZ), which was further identified to be crucial for the ferroptosis-associated antioxidant system, including glutathione peroxidase 4 (GPX4), the glutamate-cysteine ligase catalytic subunit (GCLC), and glutathione-disulfide reductase (GSR). Moreover, immunohistochemistry confirmed downregulation of GPX4 and upregulation of lipid peroxidation in the bronchial epithelium of COPD patients and Sprague-Dawley rats exposed to air pollution. Finally, proteomics analyses confirmed alterations of ETC-related proteins in bronchoalveolar lavage from COPD patients compared to healthy subjects. Together, our study discovered that involvement of mitochondrial redox dysregulation plays a vital role in pulmonary epithelial cell destruction after exposure to air pollution.
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Affiliation(s)
- Kang-Yun Lee
- Division of Pulmonary Medicine, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan; Division of Pulmonary Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
| | - Ching-Chieh Yang
- Division of Radiation Oncology, Chi Mei Medical Center, Tainan, Taiwan; Department of Pharmacy, Chia-Nan University of Pharmacy and Science, Tainan, Taiwan
| | - Pei-Wei Shueng
- Division of Radiation Oncology, Far Eastern Memorial Hospital, New Taipei City, Taiwan; Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Sheng-Min Wu
- Division of Pulmonary Medicine, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chih-Hsuan Chen
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Yi-Chun Chao
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Yu-Chu Chang
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chia-Li Han
- Master Program in Clinical Genomics and Proteomics, College of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Hsiao-Chi Chuang
- School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chi-Ching Lee
- Istanbul Sabahattin Zaim University, Faculty of Engineering and Natural Sciences, Department of Food Engineering, Istanbul, Turkey
| | - Cheng-Wei Lin
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan; Cell Physiology and Molecular Image Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan; Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan.
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Hsu SJ, Chao YC, Zeng ZC, Du S. Salvage Radiotherapy Improves Survival in Patients with Metastatic Liver Cancer after Immunotherapy Oligoprogression. Int J Radiat Oncol Biol Phys 2023; 117:e303. [PMID: 37785106 DOI: 10.1016/j.ijrobp.2023.06.2321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Immune checkpoint inhibitors (ICIs) have ameliorated the survival outcome of liver cancer, a majority of patients receiving ICIs have eventually developed progression. Local therapy, especially radiotherapy (RT), is increasingly being considered in the setting of oligoprogression to delay the need to change systemic therapy. The aim of this study was to evaluate the efficacy and safety of RT as a salvage treatment in patients with oligoprogression after ICIs. MATERIALS/METHODS This retrospective study was performed to evaluate the use of salvage radiotherapy in oligoprogressive metastatic liver cancer patients. Patients with metastatic liver cancer who had previous stability or response after ≥ 6 mo of ICIs were eligible if they developed progression of five of fewer metastases. RESULTS Overall, 178 patients treated between August 2018 and March 2022 were included. The patients were followed for a median of 17.2 months. The overall response rate (ORR) and disease control rate (DCR) were 38.2% and 57.8%, respectively. The median progression-free survival (PFS) and overall survival (OS) were 6.5 (95% CI:5.116-7.884) and 17.3 (95% CI:11.166-23.434) months. In multivariate analysis, factors associated with OS included tumor size, tumor number, and radiated tumor site (intrahepatic vs. extrahepatic). The most frequent AEs were fatigue, decreased appetite, rash, fever, and nausea. The above-mentioned AEs were reversible and manageable. CONCLUSION Salvage radiotherapy has a potential activity and is tolerable for oligoprogression after ICIs with appropriate radiated tumor site and patient selection. A prospective randomized trial is ongoing to validate this finding (ChiCTR2200060664).
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Affiliation(s)
- S J Hsu
- Department of Radiation Oncology, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Y C Chao
- Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China, Shanghai, 200000, China
| | - Z C Zeng
- Department of Radiation Oncology, Zhongshan Hospital, Fudan University, Shanghai, China
| | - S Du
- Zhongshan Hospital, Fudan University, Shanghai, China
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Dai JZ, Yang CC, Shueng PW, Wang YJ, Huang CS, Chao YC, Chen CH, Lin CW. Obesity-mediated upregulation of the YAP/IL33 signaling axis promotes aggressiveness and induces an immunosuppressive tumor microenvironment in breast cancer. J Cell Physiol 2023; 238:992-1005. [PMID: 36852589 DOI: 10.1002/jcp.30985] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/12/2023] [Accepted: 02/13/2023] [Indexed: 03/01/2023]
Abstract
Obesity is a well-known risk factor for breast cancer formation and is associated with elevated mortality and a poor prognosis. An obesity-mediated inflammatory microenvironment is conducive to the malignant progression of tumors. However, the detailed molecular mechanism is still needed to be clarified. Herein, we identified that breast cancer cells from mice with diet-induced obesity exhibited increased growth, invasiveness, and stemness capacities. A transcriptome analysis revealed that expressions of interleukin 33 (IL33) signaling pathway-related genes were elevated in obesity-associated breast cancer cells. Importantly, IL33 expression was significantly associated with the yes-associated protein (YAP) signature, and IL33 was transcriptionally regulated by YAP. Suppression of IL33 reduced tumor migration and invasion, while the addition of IL33 activated nuclear factor (NF)-κB signaling and revived tumor mobility in YAP-silenced cells. Furthermore, suppression of YAP attenuated IL33 expression which was accompanied by relief of obesity-mediated immunosuppression. Clinical analyses showed that IL33 expression was markedly associated with macrophage and regulatory T cell infiltration. These findings reveal a crucial role of the YAP/IL33 axis in promoting aggressiveness and immunosuppression of obesity-associated breast cancer progression.
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Affiliation(s)
- Jia-Zih Dai
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Biochemistry and Molecular Cell Biology, Taipei Medical University, Taipei, Taiwan
| | - Ching-Chieh Yang
- Department of Radiation Oncology, Chi Mei Medical Center, Tainan, Taiwan.,Department of Pharmacy, Chia-Nan University of Pharmacy and Science, Tainan, Taiwan
| | - Pei-Wei Shueng
- Division of Radiation Oncology, Department of Radiology, Far Eastern Memorial Hospital, New Taipei City, Taiwan.,School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Yen-Ju Wang
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Biochemistry and Molecular Cell Biology, Taipei Medical University, Taipei, Taiwan
| | - Chen-Shiuan Huang
- Department of Biochemistry and Molecular Cell Biology, Taipei Medical University, Taipei, Taiwan
| | - Yi-Chun Chao
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Biochemistry and Molecular Cell Biology, Taipei Medical University, Taipei, Taiwan
| | - Cheng-Hsun Chen
- Department of Biochemistry and Molecular Cell Biology, Taipei Medical University, Taipei, Taiwan
| | - Cheng-Wei Lin
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Biochemistry and Molecular Cell Biology, Taipei Medical University, Taipei, Taiwan.,Cell Physiology and Molecular Image Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
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Chen TY, Huang WY, Liu KH, Kor CT, Chao YC, Wu HM. The relationship between hot flashes and fatty acid binding protein 2 in postmenopausal women. PLoS One 2022; 17:e0276391. [PMID: 36260646 PMCID: PMC9581385 DOI: 10.1371/journal.pone.0276391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 10/05/2022] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION Hot flashes, the most bothering symptom of menopause, are linked to a metabolic inflammation. Due to estrogen deficiency in menopause, dysbiosis is observed. The intestinal barrier affects the interaction of microbiota in healthy or unhealthy individuals. This study investigates the relationship between hot flashes and gut permeability in postmenopausal women. PARTICIPANTS AND DESIGN In this cross-sectional study, we divided 289 women, aged 40-65 years, into four groups based on their hot-flash severity: HF0: never experienced hot flashes; HFm: mild hot flashes; HFM: moderate hot flashes; HFS: severe hot flashes. The measured variables included the clinical parameters; hot flashes experience; fasting plasma levels of zonulin, fatty acid binding protein 2 (FABP2), endotoxin, and cytokines/chemokines. We used multiple linear regression analysis to evaluate the relationship between hot flashes and the previously mentioned gut barrier proteins. SETTINGS The study was performed in a hospital medical center. RESULTS The hot flashes had a positive tendency toward increased levels of circulating FABP2 (P-trend = 0.001), endotoxin (P-trend = 0.031), high-sensitivity C-reactive protein (hs-CRP) (P-trend = 0.033), tumor necrosis factor alpha (TNF-α) (P-trend = 0.017), and interferon-inducible protein-10 (IP10) (P-trend = 0.021). Spearman's correlation analysis revealed significant correlations of FABP2 with endotoxin, TNF-α, monocyte chemoattractant protein-1, IP10, and hs-CRP in the 289 postmenopausal women included in this study. Linear regression analysis revealed that hot-flash severity had significant assoiciations with FABP2 (P-trend = 0.002), but not with zonulin. After adjusting for body mass index, age, and menopause duration, multivariate linear regression analysis revealed the differences between HFs (% difference (95% confidence interval), 22.36 (8.04, 38.59), P = 0.01) and HF0 groups in terms of FABP2 levels. CONCLUSIONS This study shows that hot flashes are significantly associated with FABP2 levels in postmenopausal women. It suggests that severe hot flashes are linked to an increase in intestinal barrier permeability and low-grade systemic inflammation.
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Affiliation(s)
- Ting-Yu Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Wan-Yu Huang
- Department of Pediatrics, Kung-Ten General Hospital, Taichung City, Taiwan
| | - Ko-Hung Liu
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Chew-Teng Kor
- Division of Statistics, Internal Medicine Research Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Yi-Chun Chao
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Hung-Ming Wu
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
- Department of Neurology, Changhua Christian Hospital, Changhua, Taiwan
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
- * E-mail:
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Wu YL, Chang JC, Sun HL, Cheng WL, Yen YP, Lin YS, Chao YC, Liu KH, Huang CS, Liu KL, Liu CS. Coenzyme Q10 Supplementation Increases Removal of the ATXN3 Polyglutamine Repeat, Reducing Cerebellar Degeneration and Improving Motor Dysfunction in Murine Spinocerebellar Ataxia Type 3. Nutrients 2022; 14:nu14173593. [PMID: 36079853 PMCID: PMC9459709 DOI: 10.3390/nu14173593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/29/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022] Open
Abstract
Coenzyme Q10 (CoQ10), a well-known antioxidant, has been explored as a treatment in several neurodegenerative diseases, but its utility in spinocerebellar ataxia type 3 (SCA3) has not been explored. Herein, the protective effect of CoQ10 was examined using a transgenic mouse model of SCA3 onset. These results demonstrated that a diet supplemented with CoQ10 significantly improved murine locomotion, revealed by rotarod and open-field tests, compared with untreated controls. Additionally, a histological analysis showed the stratification of cerebellar layers indistinguishable from that of wild-type littermates. The increased survival of Purkinje cells was reflected by the reduced abundance of TUNEL-positive nuclei and apoptosis markers of activated p53, as well as lower levels of cleaved caspase 3 and cleaved poly-ADP-ribose polymerase. CoQ10 effects were related to the facilitation of the autophagy-mediated clearance of mutant ataxin-3 protein, as evidenced by the increased expression of heat shock protein 27 and autophagic markers p62, Beclin-1 and LC3II. The expression of antioxidant enzymes heme oxygenase 1 (HO-1), glutathione peroxidase 1 (GPx1) and superoxide dismutase 1 (SOD1) and 2 (SOD2), but not of glutathione peroxidase 2 (GPx2), were restored in 84Q SCA3 mice treated with CoQ10 to levels even higher than those measured in wild-type control mice. Furthermore, CoQ10 treatment also prevented skeletal muscle weight loss and muscle atrophy in diseased mice, revealed by significantly increased muscle fiber area and upregulated muscle protein synthesis pathways. In summary, our results demonstrated biochemical and pharmacological bases for the possible use of CoQ10 in SCA3 therapy.
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Affiliation(s)
- Yu-Ling Wu
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 50091, Taiwan
- Cardiovascular and Mitochondrial Related Disease Research Center, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien 97004, Taiwan
| | - Jui-Chih Chang
- Center of Regenerative Medicine and Tissue Repair, Changhua Christian Hospital, Changhua 50091, Taiwan
- General Research Laboratory of Research Department, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Hai-Lun Sun
- School of Medicine, Chung Shan Medical University, Taichung 40203, Taiwan
- Department of Pediatrics, Division of Allergy, Asthma and Rheumatology, Chung Shan Medical University Hospital, Taichung 40203, Taiwan
| | - Wen-Ling Cheng
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Yu-Pei Yen
- Department of Nutrition, Chung Shan Medical University, Taichung 40203, Taiwan
| | - Yong-Shiou Lin
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Yi-Chun Chao
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Ko-Hung Liu
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Ching-Shan Huang
- Center of Regenerative Medicine and Tissue Repair, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Kai-Li Liu
- Department of Nutrition, Chung Shan Medical University, Taichung 40203, Taiwan
- Department of Nutrition, Chung Shan Medical University Hospital, Taichung 40203, Taiwan
- Correspondence: (K.-L.L.); (C.-S.L.); Tel.: +886-4-24730022 (ext. 12136) (K.-L.L.); +886-4-7238595 (ext. 4751) (C.-S.L.)
| | - Chin-San Liu
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 50091, Taiwan
- Department of Neurology, Changhua Christian Hospital, Changhua 50094, Taiwan
- Graduate Institute of Integrated Medicine College of Chinese Medicine, China Medical University, Taichung 40447, Taiwan
- College of Medicine, National Chung Hsing University, Taichung 40227, Taiwan
- Correspondence: (K.-L.L.); (C.-S.L.); Tel.: +886-4-24730022 (ext. 12136) (K.-L.L.); +886-4-7238595 (ext. 4751) (C.-S.L.)
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Wu YL, Chang JC, Chao YC, Chan H, Hsieh M, Liu CS. In Vitro Efficacy and Molecular Mechanism of Curcumin Analog in Pathological Regulation of Spinocerebellar Ataxia Type 3. Antioxidants (Basel) 2022; 11:antiox11071389. [PMID: 35883884 PMCID: PMC9311745 DOI: 10.3390/antiox11071389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/07/2022] [Accepted: 07/14/2022] [Indexed: 12/04/2022] Open
Abstract
Unlike other nuclear factor erythroid-2-related factor 2 (Nrf2) activators, the mechanism of action of curcumin analog, ASC-JM17 (JM17), in regulating oxidative homeostasis remains unknown. Spinocerebellar ataxia type 3 (SCA3) is an inherited polyglutamine neurodegenerative disease caused mainly by polyglutamine neurotoxicity and oxidative stress. Presently, we compared actions of JM17 with those of known Nrf2 activators, omaveloxolone (RTA-408) and dimethyl fumarate (DMF), using human neuroblastoma SK-N-SH cells with stable transfection of full-length ataxin-3 protein with 78 CAG repeats (MJD78) to clarify the resulting pathological mechanism by assaying mitochondrial function, mutant ataxin-3 protein toxicity, and oxidative stress. JM17, 1 μM, comprehensively restored mitochondrial function, decreased mutant protein aggregates, and attenuated intracellular/mitochondrial reactive oxygen species (ROS) levels. Although JM17 induced dose-dependent Nrf2 activation, a low dose of JM17 (less than 5 μM) still had a better antioxidant ability compared to the other Nrf2 activators and specifically increased mitochondrial superoxide dismutase 2 in an Nrf2-dependent manner as shown by knockdown experiments with siRNA. It showed that activation of Nrf2 in response to ROS generated in mitochondria could play an import role in the benefit of JM17. This study presents the diversified regulation of JM17 in a pathological process and helped develop more effective therapeutic strategies for SCA3.
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Affiliation(s)
- Yu-Ling Wu
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 50091, Taiwan;
| | - Jui-Chih Chang
- Center of Regenerative Medicine and Tissue Repair, Changhua Christian Hospital, Changhua 50091, Taiwan;
- General Research Laboratory of Research Department, Changhua Christian Hospital, Changhua 50091, Taiwan
| | - Yi-Chun Chao
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua 50091, Taiwan;
| | - Hardy Chan
- Allianz Pharmascience Limited, Taipei 10682, Taiwan;
| | - Mingli Hsieh
- Department of Life Science, Life Science Research Center, Tunghai University, Taichung 40704, Taiwan;
| | - Chin-San Liu
- Vascular and Genomic Center, Institute of ATP, Changhua Christian Hospital, Changhua 50091, Taiwan;
- Department of Neurology, Changhua Christian Hospital, Changhua 50094, Taiwan
- Graduate Institute of Integrated Medicine College of Chinese Medicine, China Medical University, Taichung 40447, Taiwan
- Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung 40227, Taiwan
- Correspondence: or ; Tel.: +886-4-7238595 (ext. 4751)
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Lin YT, Lin YS, Cheng WL, Chang JC, Chao YC, Liu CS, Wei AC. Transcriptomic and Metabolic Network Analysis of Metabolic Reprogramming and IGF-1 Modulation in SCA3 Transgenic Mice. Int J Mol Sci 2021; 22:ijms22157974. [PMID: 34360740 PMCID: PMC8348158 DOI: 10.3390/ijms22157974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/19/2021] [Accepted: 07/20/2021] [Indexed: 12/31/2022] Open
Abstract
Spinocerebellar ataxia type 3 (SCA3) is a genetic neurodegenerative disease for which a cure is still needed. Growth hormone (GH) therapy has shown positive effects on the exercise behavior of mice with cerebellar atrophy, retains more Purkinje cells, and exhibits less DNA damage after GH intervention. Insulin-like growth factor 1 (IGF-1) is the downstream mediator of GH that participates in signaling and metabolic regulation for cell growth and modulation pathways, including SCA3-affected pathways. However, the underlying therapeutic mechanisms of GH or IGF-1 in SCA3 are not fully understood. In the present study, tissue-specific genome-scale metabolic network models for SCA3 transgenic mice were proposed based on RNA-seq. An integrative transcriptomic and metabolic network analysis of a SCA3 transgenic mouse model revealed that metabolic signaling pathways were activated to compensate for the metabolic remodeling caused by SCA3 genetic modifications. The effect of IGF-1 intervention on the pathology and balance of SCA3 disease was also explored. IGF-1 has been shown to invoke signaling pathways and improve mitochondrial function and glycolysis pathways to restore cellular functions. As one of the downregulated factors in SCA3 transgenic mice, IGF-1 could be a potential biomarker and therapeutic target.
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Affiliation(s)
- Yu-Te Lin
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 10617, Taiwan;
| | - Yong-Shiou Lin
- Institute of ATP, Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50091, Taiwan; (Y.-S.L.); (W.-L.C.); (J.-C.C.)
| | - Wen-Ling Cheng
- Institute of ATP, Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50091, Taiwan; (Y.-S.L.); (W.-L.C.); (J.-C.C.)
| | - Jui-Chih Chang
- Institute of ATP, Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50091, Taiwan; (Y.-S.L.); (W.-L.C.); (J.-C.C.)
| | - Yi-Chun Chao
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua 50091, Taiwan;
| | - Chin-San Liu
- Institute of ATP, Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50091, Taiwan; (Y.-S.L.); (W.-L.C.); (J.-C.C.)
- Department of Neurology, Changhua Christian Hospital, Changhua 50091, Taiwan
- Graduate Institute of Integrated Medicine College of Chinese Medicine, China Medical University, Taichung 40402, Taiwan
- Correspondence: (C.-S.L.); (A.-C.W.); Tel.: +886-4-7238595 (C.-S.L.); +886-2-33668612 (A.-C.W.)
| | - An-Chi Wei
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 10617, Taiwan;
- Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Correspondence: (C.-S.L.); (A.-C.W.); Tel.: +886-4-7238595 (C.-S.L.); +886-2-33668612 (A.-C.W.)
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Chang JC, Chao YC, Chang HS, Wu YL, Chang HJ, Lin YS, Cheng WL, Lin TT, Liu CS. Intranasal delivery of mitochondria for treatment of Parkinson's Disease model rats lesioned with 6-hydroxydopamine. Sci Rep 2021; 11:10597. [PMID: 34011937 PMCID: PMC8136477 DOI: 10.1038/s41598-021-90094-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 03/23/2021] [Indexed: 02/06/2023] Open
Abstract
The feasibility of delivering mitochondria intranasally so as to bypass the blood-brain barrier in treating Parkinson's disease (PD), was evaluated in unilaterally 6-OHDA-lesioned rats. Intranasal infusion of allogeneic mitochondria conjugated with Pep-1 (P-Mito) or unconjugated (Mito) was performed once a week on the ipsilateral sides of lesioned brains for three months. A significant improvement of rotational and locomotor behaviors in PD rats was observed in both mitochondrial groups, compared to sham or Pep-1-only groups. Dopaminergic (DA) neuron survival and recovery > 60% occurred in lesions of the substantia nigra (SN) and striatum in Mito and P-Mito rats. The treatment effect was stronger in the P-Mito group than the Mito group, but the difference was insignificant. This recovery was associated with restoration of mitochondrial function and attenuation of oxidative damage in lesioned SN. Notably, P-Mito suppressed plasma levels of inflammatory cytokines. Mitochondria penetrated the accessory olfactory bulb and doublecortin-positive neurons of the rostral migratory stream (RMS) on the ipsilateral sides of lesions and were expressed in striatal, but not SN DA neurons, of both cerebral hemispheres, evidently via commissural fibers. This study shows promise for intranasal delivery of mitochondria, confirming mitochondrial internalization and migration via RMS neurons in the olfactory bulb for PD therapy.
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Affiliation(s)
- Jui-Chih Chang
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan.
| | - Yi-Chun Chao
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Huei-Shin Chang
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Yu-Ling Wu
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Hui-Ju Chang
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Yong-Shiou Lin
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Wen-Ling Cheng
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Ta-Tsung Lin
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan
| | - Chin-San Liu
- Vascular and Genomic Center, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan.
- Department of Neurology, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50094, Taiwan.
- School of Chinese Medicine, Graduate Institute of Chinese Medicine, Graduate Institute of Integrated Medicine, College of Chinese Medicine, Research Center for Chinese Medicine and Acupuncture, China Medical University, Taichung, 40447, Taiwan.
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Huang SC, Ng KF, Chang IYF, Chang CJ, Chao YC, Chang SC, Chen MC, Yeh TS, Chen TC. The clinicopathological significance of SWI/SNF alterations in gastric cancer is associated with the molecular subtypes. PLoS One 2021; 16:e0245356. [PMID: 33481850 PMCID: PMC7822341 DOI: 10.1371/journal.pone.0245356] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 10/11/2020] [Accepted: 12/28/2020] [Indexed: 12/24/2022] Open
Abstract
The clinicopathological significance of altered SWI/SNF complex has not been well evaluated in gastric cancer (GC). We examined SMARCA2, SMARCA4, SMARCB1 and ARID1A expression by immunohistochemistry in 1224 surgically resected GCs with subtyping into Epstein-Barr virus (EBV), microsatellite instability (MSI) and non-EBV/MSI Lauren histotypes. SWI/SNF mutations were investigated using the GC dataset of the TCGA Pan-Cancer Atlas. Clinicopathological association was assessed by statistical analysis. There were 427 cases (35%) of SWI/SNF-attenuated GC, including 344 SMARCA2 (28%), 28 SMARCA4 (2%), 11 SMARCB1 (1%) and 197 ARID1A (16%) cases. Simultaneous alterations of multiple subunits were observed. Compared to SWI/SNF-retained cases, SWI/SNF-attenuated GC exhibited a significant predilection to older ages, EBV and MSI genotypes, higher lymphatic invasion and less hematogenous recurrence (P < 0.05). SWI/SNF attenuation was an independent risk factor for short overall survival (P = 0.001, hazard ratio 1.360, 95% confidence interval 1.138-1.625). The survival impact stemmed from SMARCA2-attenuated GCs in stage III and non-EBV/MSI diffuse/mixed subtypes (P = 0.019 and < 0.001, respectively). ARID1A-lost/heterogeneous GCs were more aggressive in the EBV genotype (P = 0.016). SMARCB1 or SMARCA4 loss was not restricted to rhabdoid/undifferentiated carcinoma. In the TCGA dataset, 223 of 434 GCs (52%) harbored deleterious SWI/SNF mutations, including ARID1A (27%), SMARCA2 (9%), ARID2 (9%), ARID1B (8%), PBRM1 (7%), and SMARCA4 (7%). SWI/SNF-mutated GCs displayed a favorable outcome owing to the high percentage with the MSI genotype. In conclusion, SWI/SNF-altered GCs are common and the clinicopathological significance is related to the genotype.
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Affiliation(s)
- Shih-Chiang Huang
- Department of Anatomic Pathology, Linkou Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, Taiwan
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Kwai-Fong Ng
- Department of Anatomic Pathology, Linkou Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, Taiwan
| | - Ian Yi-Feng Chang
- Molecular Medicine Research Center, Chang Gung University, Taoyuan, Taiwan
| | - Chee-Jen Chang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Research Services Center for Health Information, Chang Gung University, Taoyuan, Taiwan
- Clinical Informatics and Medical Statistics Research Center, Chang Gung University, Taoyuan, Taiwan
- Department of Biomedical Sciences, Chang Gung University, Taoyuan, Taiwan
- Department of Cardiology, Linkou Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, Taiwan
| | - Yi-Chun Chao
- Department of Anatomic Pathology, Linkou Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, Taiwan
| | - Shu-Chen Chang
- Research Services Center for Health Information, Chang Gung University, Taoyuan, Taiwan
| | - Min-Chi Chen
- Department of Public Health, Biostatistics Consulting Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Hematology and Oncology, Chiayi Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Chiayi, Taiwan
| | - Ta-Sen Yeh
- Department of Surgery, Linkou Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, Taiwan
| | - Tse-Ching Chen
- Department of Anatomic Pathology, Linkou Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, Taiwan
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Huang SC, Ng KF, Yeh TS, Cheng CT, Chen MC, Chao YC, Chuang HC, Liu YJ, Chen TC. The clinicopathological and molecular analysis of gastric cancer with altered SMARCA4 expression. Histopathology 2020; 77:250-261. [PMID: 32343857 DOI: 10.1111/his.14117] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 04/09/2020] [Accepted: 04/13/2020] [Indexed: 12/13/2022]
Abstract
AIMS In this study, we examine the clinicopathological and molecular features of gastric cancer (GC) with SMARCA4 alterations. METHODS AND RESULTS We screened SMARCA4 alterations using immunohistochemistry on 1199 surgically resected GCs with information on Epstein-Barr virus (EBV), microsatellite instability (MSI) and other SWI/SNF subunits. SMARCA4, SMARCA2 and ARID1A mutations were investigated by targeted sequencing. The clinicopathological significance was determined by statistical analysis. Twenty-seven cases (2%) with altered SMARCA4 expression were identified, exhibiting completely lost (six), reduced (nine) or heterogeneous (12) patterns. Frequent concomitant alterations of other SWI/SNF subunits were noted with an unusual discordant spatial heterogeneity. In comparison with SMARCA4-retained GCs, SMARCA4-lost GCs were observed more frequently in the non-EBV/MSI subgroup (five of six) and reduced or heterogeneous SMARCA4 expression mainly occurred in EBV- or MSI-associated cases (six of nine and six of 12, respectively; P < 0.001). Histologically, SMARCA4-altered GC, irrespective of expression pattern, demonstrated divergent histomorphology, spanning tubular, poorly cohesive or mixed, neuroendocrine to solid and undifferentiated carcinoma, with a predilection to the latter two (P < 0.001). De-differentiation-like transition and rhabdoid features were noted in a minority of cases. For overall survival, altered SMARCA4 expression was an unfavourable prognostic factor in stage III, EBV-associated GC and non-EBV/MSI intestinal subtype (P ≤ 0.001). SMARCA4 or ARID1A mutations were detected mainly in SMARCA4-lost or reduced GC, respectively. CONCLUSIONS SMARCA4-altered GCs are rare and have intratumoral heterogeneity, histomorphological diversity, conditional prognostic significance and various genetic drivers. SMARCA4-lost GC may represent a genuine SMARCA4-deficient neoplasm, but most SMARCA4-reduced/heterogeneous cases are secondary to ARID1A collapse or associated with different genotypes.
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Affiliation(s)
- Shih-Chiang Huang
- Department of Anatomic Pathology, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan.,Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Kwai-Fong Ng
- Department of Anatomic Pathology, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
| | - Ta-Sen Yeh
- Department of Surgery, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
| | - Chi-Tung Cheng
- Department of Surgery, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
| | - Min-Chi Chen
- Department of Public Health, College of Medicine, Biostatistics Consulting Center, Chang Gung University, Taoyuan, Taiwan.,Department of Hematology and Oncology, College of Medicine, Chiayi Chang Gung Memorial Hospital, Chang Gung University, Chiayi, Taiwan
| | - Yi-Chun Chao
- Department of Anatomic Pathology, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
| | - Huei-Chieh Chuang
- Department of Anatomic Pathology, College of Medicine, Chiayi Chang Gung Memorial Hospital, Chang Gung University, Chiayi, Taiwan
| | - Yu-Jen Liu
- Department of Anatomic Pathology, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
| | - Tse-Ching Chen
- Department of Anatomic Pathology, College of Medicine, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
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Talite MJA, Lin HT, Jiang ZC, Lin TN, Huang HY, Heredia E, Flores A, Chao YC, Shen JL, Lin CAJ, Yuan CT. Solid-state, ambient-operation thermally activated delayed fluorescence from flexible, non-toxic gold-nanocluster thin films: towards the development of biocompatible light-emitting devices. Nanotechnology 2016; 27:345701. [PMID: 27405350 DOI: 10.1088/0957-4484/27/34/345701] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Luminescent gold nanoclusters (AuNCs) with good biocompatibility have gained much attention in bio-photonics. In addition, they also exhibit a unique photo-physical property, namely thermally activated delayed fluorescence (TADF), by which both singlet and triplet excitons can be harvested. The combination of their non-toxic material property and unique TADF behavior makes AuNCs biocompatible nano-emitters for bio-related light-emitting devices. Unfortunately, the TADF emission is quenched when colloidal AuNCs are transferred to solid states under ambient environment. Here, a facile, low-cost and effective method was used to generate efficient and stable TADF emissions from solid AuNCs under ambient environment using polyvinyl alcohol as a solid matrix. To unravel the underlying mechanism, temperature-dependent static and transient photoluminescence measurements were performed and we found that two factors are crucial for solid TADF emission: small energy splitting between singlet and triplet states and the stabilization of the triplet states. Solid TADF films were also deposited on the flexible plastic substrate with patterned structures, thus mitigating the waveguide-mode losses. In addition, we also demonstrated that warm white light can be generated based on a co-doped single emissive layer, consisting of non-toxic, solution-processed TADF AuNCs and fluorescent carbon dots under UV excitation.
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Affiliation(s)
- M J A Talite
- Department of Physics, Chung Yuan Christian University, Chung Li, Taiwan
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Liu TY, Chen Y, Wang HH, Huang YL, Chao YC, Tsai KT, Cheng WC, Chuang CY, Tsai YH, Huang CY, Wang DW, Lin CH, Wang JK, Wang YL. Differentiation of bacteria cell wall using Raman scattering enhanced by nanoparticle array. J Nanosci Nanotechnol 2012; 12:5004-8. [PMID: 22905567 DOI: 10.1166/jnn.2012.4941] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We have fabricated surface-enhanced Raman scattering (SERS) substrates based on arrays of silver nanoparticles grown on porous anodic alumina templates. Using this nanotechnology platform, label-free and high-speed detection of bacteria are achieved. SERS spectra of various bacteria including Staphylococcus Aureus (Gram-positive bacterium), Klebsiella Pneumoniae (Gram-negative bacterium), and Mycobacterium Smegmatis (Mycobacterium) were recorded. The highly reproducible SERS-based technological platform is capable of differentiating different kinds of bacteria by PCA, LDA, clustering analysis, and SVM methods, which provides promising opportunity for biosensing of clinical microbes.
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Affiliation(s)
- T Y Liu
- Institute of Atomic and Molecular Science, Academia Sinica, Taipei 10617, Taiwan
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Chao YC, Humphreys S, Penfield W. A New Method of preventing Adhesions. The Use of Amnioplastin after Craniotomy. Br Med J 2011; 1:517-538.1. [PMID: 20783023 DOI: 10.1136/bmj.1.4134.517] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Peters AT, Chao YC. Substituent effects on the colour, dyeing and fastness properties of 4-arylamino-5-nitro-(and amino)-1, 8-dihydroxyanthraquinone and 4-arylamino-8-nitro-(and amino)-1, 5-dihydroxyanthraquinone disperse dyes. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1478-4408.1988.tb01143.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
Summary The purpose of this study was to investigate the galactose single point (GSP) method, a residual liver function test recently recommended by the US Food and Drug Administration, which can be a useful tool for rat liver function measurement. Rats were treated either with carbon tetrachloride (CCl4) alone (1 mL/kg, intraperitoneally [i.p.]) for one day or with isoniazid (INH) alone (150 mg/kg, i.p.) or (in order to ameliorate the effects of INH) with a combination of INH and bis- p-nitrophenyl phosphate (BNPP) (25 mg/kg, i.p.) for 21 days. Hepatotoxicity was assayed by plasma aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities and scores of histological activity index-necroinflammation (HAI-NI) of the respective liver specimens. The GSP method in rats was defined by the galactose blood level after 60 min. Significant differences in GSP values were observed between controls and the CCl4-treated rats. After 21 days of treatment, no significant changes in AST and ALT values were observed among the control, INH and INH-BNPP groups. There were significant differences in average GSP values for controls ( P < 0.001) and INH-BNPP ( P < 0.001) compared with INH alone. Highly significant correlations ( P < 0.001) were obtained between GSP and scores of HAI-NI for all the groups. GSP was concluded to be a more sensitive biomarker of INH-induced hepatotoxicity than AST or ALT in the rats. The GSP method has been proved to be a simple and useful tool for the quantitative determination of liver function in rats, which can possibly be extended to other animals.
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Affiliation(s)
- T H Young
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan, ROC
- Division of Gastroenterology, Department of Internal Medicine, Cardinal Tien Hospital, Fu Jen Catholic University, Taipei, Taiwan, ROC
| | - H S Tang
- Division of Gastroenterology, Department of Internal Medicine, Cardinal Tien Hospital, Fu Jen Catholic University, Taipei, Taiwan, ROC
| | - Y C Chao
- Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - H S Lee
- Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - C H Hsiong
- School of Pharmacy, National Defense Medical Center, Taipei, Taiwan, ROC
| | - L H Pao
- School of Pharmacy, National Defense Medical Center, Taipei, Taiwan, ROC
| | - O Y P Hu
- School of Pharmacy, National Defense Medical Center, Taipei, Taiwan, ROC
- Department of Research and Development, National Defense Medical Center, 161 Minchuan East Road, Sector 6, Taipei, Taiwan 114, ROC
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Pai WW, Huang SH, Meng YS, Chao YC, Lin CH, Liu HL, Chou FC. Sodium trimer ordering on a NaxCoO2 surface. Phys Rev Lett 2008; 100:206404. [PMID: 18518561 DOI: 10.1103/physrevlett.100.206404] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2008] [Indexed: 05/26/2023]
Abstract
Sodium ion ordering on an in situ cleaved NaxCoO2 (x=0.84) surface has been studied by ultrahigh vacuum scanning tunneling microscopy at room temperature. Three main phases, with p(3 x 3), ( radical7 x radical7), and (2 radical3 x 2 radical3) hexagonal unit cells and a surface Na concentration of 1/3, 3/7, 1/2, respectively, were identified. One surprising finding is that Na trimers act as the basic building blocks that order in long range. The stability of Na trimers is attributed to the increased Na coordination with oxygen as indicated by ab initio calculations, and possibly at finite temperature by configuration entropy.
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Affiliation(s)
- Woei Wu Pai
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan, Republic of China.
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Abstract
Aglaonema (Aglaonema spp.) is a popular ornamental potted plant in Taiwan. In 2003, leaves showing soft rot symptoms were found on a number of Sithiporn aglaonema (A. marantifoloum var. tricolor × A. rotundum) plants in a nursery in southern Taiwan. The disease usually started from leaf tips or wounded sites and the affected areas appeared water soaked. The diseased tissue subsequently turned dark brown and became fragile. More than 50% of Sithiporn aglaonema plants were destroyed in the affected nursery. Bacteria isolated from the symptomatic leaves grew at 39°C, degraded pectate, caused soft rot on slices of potato tuber and petioles of Chinese cabbage, produced phosphatase and lecithinase, and utilized malonate, but did not grow in 5% NaCl or produce acid from trehalose. These characteristics were similar to those of Erwinia chrysanthemi Burkholder et al. (1,2) and the reference strain OS2 from Phalaenopsis sp. provided by K. C. Tzeng of National Chung Hsing University, Taichung, Taiwan. Polymerase chain reaction (PCR) analysis using the primer pair 5A (5' GCGGTTGTTCACCAGGTGTTTT 3') and 5B (5' ATGCACGCTACCTGGAAGTAT 3') specific for E. chrysanthemi (4) confirmed the identity of all seven isolates tested as E. chrysanthemi. The primer pair 5A/5B was designed from the sequences of pT8-1, idg (a gene for blue-pigment synthesis), and pecS (a gene for regulation of pectinase, cellulose, and pigment production). PCR products amplified from E. chrysanthemi DNA with the 5A/5B primer were 500 bp (4). Pathogenicity of isolates was confirmed by rubbing the leaf surface of Sithiporn aglaonema plants with Carborundum and spraying the wounded surface with a bacterial suspension at 1 × 108 CFU/ml in the greenhouse. Plant leaves sprayed with distilled water were used as the control. Three leaves were inoculated for each isolate, and the experiment was conducted twice. Symptoms appeared within 24 h after inoculation. All seven isolates tested were pathogenic, causing an average of 86 to 95% of inoculated leaves to show water-soaked symptoms similar to these observed in nature. Symptoms did not occur on control leaves. E. chrysanthemi was reisolated from diseased tissues of inoculated leaves. To our knowledge, this is the first report of bacterial blight caused by E. chrysanthemi on aglaonema in Taiwan and the first report of the disease on the Sithiporn cultivar of aglaonema. This disease on aglaonema was previously reported in the United States (3). References: (1) R. S. Dickey and A. Kelman. Page 44 in: Laboratory Guide for Identification of Plant Pathogenic Bacteria. N. W. Schaad, ed. The American Phytopathological Society, St. Paul, MN, 1988. (2) M. Goto and K. Matsumoto. Int. J. Syst. Bacteriol. 37:130, 1987. (3) L. A. McFadden. Plant Dis. Rep. 53:253. 1969. (4) M. G. Zhu. Ph.D. diss, National Chung Hsing University, Taichung, Taiwan, 1995.
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Affiliation(s)
- Y C Chao
- Department of Plant Protection, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
| | - C T Feng
- Department of Plant Protection, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
| | - W C Ho
- Department of Plant Protection, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
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Feng CT, Ho WC, Chao YC. Basal Petiole Rot and Plant Kill of Zamioculcas zamiifolia Caused by Phytophthora nicotianae. Plant Dis 2006; 90:1107. [PMID: 30781312 DOI: 10.1094/pd-90-1107b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Zamioculcas zamiifolia (Lodd.) Engl., commonly called 'ZZ' plant, is a monocotyledonous plant in the Araceae. It is a new introduction in the foliage plant industry worldwide and is an increasing popular ornamental foliage plant in Taiwan. In 2003, basal petiole rot and death of ZZ plants were found in two nurseries in southern Taiwan with 18% of the plants diseased at one nursery. Early symptoms were water soaking of the petiole base and a slight yellowing of the leaflets followed by browning of leaflets. As the disease progressed, the petiole base became dark brown, shriveled, collapsed, and eventually rotted. The surface of the roots and rhizomes of diseased plants were initially blackish brown followed by root rots and mortality of plants. A Phytophthora species was consistently isolated from diseased petioles, rhizomes, and roots on a selective medium (4). Two single zoospore isolates (2), each from a different nursery, were used for morphological and pathogenicity tests. The isolates were grown on vegetable juice agar (10% V8 juice, 0.02% CaCO3, and 2% agar [VJA]) at 28°C with 12-h irradiation for 10 days. Sporangia were nondeciduous, terminal or intercalary, and attached to irregularly or sympodially branched sporangiophores. Papillate sporangia were spherical to broadly ovoid or obpyriform, averaged 37.3 × 30.2 μm, and ranged from 23 to 55 μm in length by 17 to 46 μm in diameter, with a length/breadth ratio of 1.24 and a range of 1.1 to 1.4. Chlamydospores with walls 1 to 4 μm thick were terminal or intercalary, spherical, averaged 30.6 μm in diameter, and ranged from 18 to 46 μm. On the basis of the morphological characteristics above, Phytophthora nicotianae Breda de Haar. (synonym P. parasitica Dastur) was identified (1). Paired with known A1 and A2 mating types of P. cinnamomi on VJA, both P. nicotianae cultures were A2, forming oospores after 14 days in darkness at 28°C. Disease-free ZZ plants were propagated by rhizomes in 242-cm3 round pots with 500 g of sterilized potting medium (vermiculite/peat moss/perlite = 1:2:1). Plants with 30 cm long petiole were used for inoculation. For the pathogenicity test, both isolates were grown on VJA plates sealed with Parafilm at 28°C in darkness. After 10 days, aerial mycelia with sporangia were scraped off the plates, placed in 10 ml of sterile distilled water at 8°C for 15 min to release zoospores. A zoospore suspension was adjusted to 104 zoospores/ml following enumeration with a microliter pipette (3) and 200 ml of the suspension was added to each pot, or rhizomes and roots were dipped in 400 ml of the suspension for 60 min and planted immediately. Ten plants were inoculated with either method and water was added to inoculated control plants. Water soaking of the petiole bases developed in 7 days and mortality occurred in 10 days in a screenhouse after plants were inoculated with either method. Control plants remained healthy and no petiole, root, or rhizome rots developed. P. nicotianae was isolated from the advancing lesions of the inoculated plants and both experiments were repeated. To our knowledge, this is the first report of basal petiole rot and plant kill of Zamioculcas zamiifolia caused by P. nicotianae. References: (1) D. C. Erwin and O. K. Ribeiro. Phytophthora Diseases Worldwide. The American Phytopathological Society, St. Paul, MN, 1996. (2) W. C. Ho and W. H. Ko. Bot. Bull. Acad. Sin. 38:41, 1997. (3) W. H. Ko et al. Phytopathology 63:1206, 1973. (4) W. H. Ko et al. Trans. Br. Mycol. Soc. 71:496, 1978.
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Affiliation(s)
- C T Feng
- Department of Plant Protection, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
| | - W C Ho
- Department of Plant Protection, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
| | - Y C Chao
- Department of Plant Protection, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
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Bai MD, Cheng SS, Chao YC. Effects of substrate components on hydrogen fermentation of multiple substrates. Water Sci Technol 2004; 50:209-216. [PMID: 15566205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
As is well known, carbohydrate is the most appropriate organic material for hydrogen fermentation, and its hydrogen yield is significantly larger than that of protein. The fermentation of protein began with hydrogen production followed by hydrogen consumption, which helps overall hydrogen recovery. Both carbohydrate and protein are basic components of organic material, and yet carbohydrate is known to be a better substrate than protein in terms of hydrogen yield during hydrogen fermentation. This study used multiple substrates containing different ratios of glucose and peptone as multiple substrates to investigate the roles played by carbohydrate and protein in hydrogen fermentation. The experimental results demonstrated that suitable ratios of glucose and peptone improved the growth of hydrogen producing bacteria. Additionally, a maximum hydrogen yield of 6.4 mmole-H2/g-COD was obtained from the multiple substrate containing 40% peptone and 60% glucose. Most of the produced hydrogen came from fermentation of glucose, not peptone. During hydrogen fermentation, the pH dropped by 1.0 and 1.9 units in 80% and 20% of peptone content in the substrate. Ammonia produced due to peptone degradation neutralized the acids produced from hydrogen fermentation.
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Affiliation(s)
- M D Bai
- Department of Environmental Engineering, National Cheng-Kung University, Tainan 701, Taiwan.
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22
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Abstract
The primary objective of this study was to investigate the effect of geniposide, a potent anti-inflammatory, on ovalbumin-antigen-induced tracheal permeability and transepithelial electrical resistance in guinea pigs. Two weeks after sensitization with ovalbumin (100 mg/ml), the permeability of guinea-pig tracheas was evaluated by flux measurements using the transcellular tracer, [(14)C]estradiol, and the paracellular tracer, [(14)C]mannitol. The effect of extracellular Ca(2+) with geniposide was also studied, using deletion of Ca(2+) in the donor chamber. The in vivo treatment effect of aerosolized geniposide on tracheal permeability in the ovalbumin-sensitized guinea pigs was also evaluated. The results indicate that tight junction permeability of ovalbumin-sensitized trachea was significantly dose dependent and decreased by geniposide (1-10 mM), as evidenced by substantial recovery of transepithelial electrical resistance and decreased transepithelial permeability of [(14)C]mannitol at (1.32+/-0.12) x 10(-5) cm/s. The effect of combination of the removal of extracellular Ca(2+) with geniposide had no effect on tight junction permeability of ovalbumin-sensitized trachea and revealed that transepithelial electrical resistance and junction permeability did not recover. In addition, the cAMP levels and phosphodiesterase activity were not significantly influenced in ovalbumin-sensitized tracheal tissues after geniposide treatment. Inhaled geniposide (50 mM, 30 min after ovalbumin sensitization) significantly restored junction permeability induced by ovalbumin (100 mg/ml, 2 min). Junction permeability did not recover on pretreatment with geniposide (50 mM for 30 min over 16 days consecutive before ovalbumin sensitization) after exposure of conscious guinea pigs to aerosol ovalbumin. In conclusion, geniposide has inhibitory effects on ovalbumin-induced junction permeability and recovery of transepithelial electrical resistance in guinea pig trachea, showing its potential as anti-asthma therapy.
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Affiliation(s)
- J Liaw
- Department of Pharmaceutics, School of Pharmacy, Taipei Medical University, 250 Wu Hsing Street, Taipei 110, Taiwan.
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23
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Chao YC. [A study of sui in Wu-shih-erh-ping-fang] (Jpn). Nihon Ishigaku Zasshi 2001; 33:218-22. [PMID: 11612137] [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: 02/21/2023]
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24
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Huang CS, Luo GA, Huang MJ, Chen ES, Young TH, Chao YC. A novel compound heterozygous variation of the uridine-diphosphoglucuronosyl transferase 1A1 gene that causes Crigler-Najjar syndrome type II. Pharmacogenetics 2001; 11:639-42. [PMID: 11668224 DOI: 10.1097/00008571-200110000-00011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- C S Huang
- Department of Laboratory Medicine, Cathay General Hospital, Taipei, Taiwan.
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25
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Lai CL, Chao YC, Chen YC, Liao CS, Chen MC, Liu YC, Yin SJ. No sex and age influence on the expression pattern and activities of human gastric alcohol and aldehyde dehydrogenases. Alcohol Clin Exp Res 2001. [PMID: 11104109 DOI: 10.1111/j.1530-0277.2000.tb01963.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) are the principal enzymes responsible for ethanol metabolism in humans. The stomach is involved in the metabolism of alcohol during absorption. Conflicting reports exist with regard to the influence of sex and age on the activity of ADH in the human gastric mucosa. The purpose of the present study was to determine the effects of age and sex on the expression pattern and activities of stomach ADH and ALDH. METHODS A total of 115 endoscopic gastric biopsy specimens were investigated from Han Chinese men (n = 70) and women (n = 45) aged 20-79 years with approximately even distribution among 10-year age intervals. The expression patterns of ADH and ALDH were identified by isoelectric focusing, and the activities were assayed spectrophotometrically. RESULTS The expression patterns of gastric ADH and ALDH remained unchanged with respect to sex and age. At 33 mM or 500 mM ethanol, pH 7.5, the ADH activities did not differ significantly among the various age groups or between men and women. At 200 microM or 20 mM acetaldehyde, the ALDH activities did not differ significantly in relation to sex and age. No correlations were found between the ADH or ALDH activities at both the high and low substrate concentrations and the ages in men and women. CONCLUSIONS The results indicate that there is no significant effect of either sex or age on the expression pattern and activity of ADH and ALDH in the human gastric mucosa. The stomach ADH seems unlikely to account for possible variations in the first-pass metabolism of alcohol with regard to sex and age.
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Affiliation(s)
- C L Lai
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, Republic of China
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26
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Chao YC, Wang LS, Hsieh TY, Chu CW, Chang FY, Chu HC. Chinese alcoholic patients with esophageal cancer are genetically different from alcoholics with acute pancreatitis and liver cirrhosis. Am J Gastroenterol 2000; 95:2958-64. [PMID: 11051375 DOI: 10.1111/j.1572-0241.2000.02328.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE It is a mystery why some alcoholic patients acquire certain organ-specific complications of alcoholism, whereas other alcoholic patients acquire different ones. The aim of this study was to investigate the differences among Chinese alcoholic patients with esophageal cancer, acute pancreatitis, and liver cirrhosis by studying the genetic polymorphisms of ADH2, ADH3, ALDH2, and P4502E1. METHODS Liver alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH), and cytochrome P4502E1 (P4502E1) are polymorphic at the ADH2, ADH3, and ALDH2 loci and the 5'-flanking region of the P4502E1. Using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method, we determined the polymorphism of the above-mentioned alcohol metabolizing genes in 59 alcoholics with carcinoma of the esophagus (alcoholic esophageal Ca), 87 acute alcoholic pancreatitis patients, 116 alcoholics with liver cirrhosis (alcoholic cirrhosis), 19 alcoholics with both liver cirrhosis and acute pancreatitis (alcoholic P plus C), and 241 nonalcoholic patients. RESULTS The results showed that the allele frequency of ALDH2*2 was significantly higher in the alcoholic esophageal Ca group than in the alcoholic pancreatitis and alcoholic cirrhosis groups. The allele frequency of ADH2*1 was significantly higher in the alcoholic esophageal Ca patients than in nonalcoholic control groups. The ALDH2*2 was significantly lower in alcoholic groups (except the alcoholic esophageal Ca group) than in nonalcoholic control groups. The allele frequencies of ADH2*1 and ALDH2*2 are higher in alcoholic patients with esophageal Ca than alcoholic patients without it. The genotype distribution of P4502E1, detected by RsaI and PstI, was not different among alcoholic patients with different organ diseases. CONCLUSIONS The allele frequency of ADH2*1 and ALDH2*1 are different among subpopulations of alcoholics, suggesting that alcoholic patients with different specific types of organ damage are genetically different. The Chinese alcoholic patients with the ADH2*1 and ALDH2*2 allele are more susceptible to esophageal Ca.
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Affiliation(s)
- Y C Chao
- Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
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27
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Yu HY, Wu ZA, Su MS, Yen DJ, Luk HR, Chao YC, Liao KK, Lin KP, Yu SM, Liu HC. Problem-based, small-group tutorial learning in clinical neurology for second-year medical students. Zhonghua Yi Xue Za Zhi (Taipei) 2000; 63:598-604. [PMID: 10969445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
BACKGROUND Problem-based learning (PBL) in small-group tutorials has been a trend in medical education. Chinese students are known to be reserved and passive; thus, they may not be adaptable to PBL. Neuroanatomy, important to clinical neurology, is difficult to learn. We incorporated clinical neurology with PBL, complementary to the traditional neuroanatomy curriculum, to evaluate the feasibility of PBL for Chinese students in Taiwan. METHODS Forty-two second-year medical students and seven tutors participated in the clinical neurology PBL small-group tutorials. Twelve case reports were discussed weekly beginning in February, 1999. Each case was designed to meet the progressive curriculum of the neuroanatomy course. The tutors evaluated the students by the degree of their preparation, participation, key-point comprehension and interaction. All tutors and students filled out questionnaires at the end of each session. RESULTS The majority of the students and tutors agreed that the case materials were clearly written. Ninety percent of the students agreed that the case materials matched the traditional content of neuroanatomy. Eighty-five percent of students and 71% of tutors were satisfied and found the class rewarding. Ninety-one percent of students and 74% of tutors were in favor of PBL being continued. CONCLUSIONS This preliminary PBL, small-group tutorial learning in clinical neurology showed satisfactory results and was, indeed, complementary to a traditional neuroanatomy course. The students, as early as during the second year of their medical school education, were able to learn through the PBL. More integration of basic and clinical sciences by PBL may be considered in future curricula designs.
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Affiliation(s)
- H Y Yu
- Neurological Institute, Taipei Veterans General Hospital, Taiwan, ROC
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28
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Chao YC, Tsai LP, Chang YW, Tsai HY. Bilateral ulnar hemimelia in Brachmann-de Lange syndrome: report of one case. Acta Paediatr Taiwan 2000; 41:211-3. [PMID: 11021007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Twenty-three cases of Brachmann-de Lange syndrome (BDLS) have been reported in literature here in Taiwan, but none of them had severe upper limb anomalies. We report on a male infant with BDLS who has bilateral ulnar hemimelia.
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Affiliation(s)
- Y C Chao
- Department of Pediatrics, Taipei Municipal Ho-Ping Hospital, Taipei, Taiwan
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29
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Wu TY, Liono L, Chen SL, Chen CY, Chao YC. Expression of highly controllable genes in insect cells using a modified tetracycline-regulated gene expression system. J Biotechnol 2000; 80:75-83. [PMID: 10862988 DOI: 10.1016/s0168-1656(00)00247-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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: 11/19/2022]
Abstract
A modified tetracycline-responsive expression system (TRES) for use in insect cells was developed. The TRES contains two components: one encodes a tetracycline-controllable transactivator (tTA) and the other contains a tet operator DNA sequence to drive the luciferase gene. Our results show that the human cytomegalovirus (CMV) promoter, an essential part for strong tTA expression in mammalian system, was not functional in insect cells. Thus further modifications were required. Functional tTA was efficiently expressed in Sf9, Sf21, and TN368 cells by the p10 promoter of Autographa californica multiple nuclear polyhedrosis virus (AcMNPV) in plasmid form with virus co-infection. An increase of up to 258-fold of luciferase activity was detected in these cells when both components in modified TRES were co-transfected. In order to further simplify the experiment, tTA, which is driven by the p10 promoter, was inserted into AcMNPV. Luciferase activity was also strongly stimulated by the infection of this tTA expression-recombinant virus with the transfection of a plasmid containing the second TRES component expressing luciferase. The luciferase expressions in these systems, either in plasmids or the tTA gene in virus and luciferase in plasmid, were significantly suppressed by tetracycline. The time course kinetics of tetracycline action to the TRES were further studied. Within a time span of 50 h, the luciferase activities could be fully suppressed or activated, respectively, corresponding to the addition or removal of tetracycline. These experiments have established a well-regulated gene expression system for further broad applications of molecular biological studies in insect cells.
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Affiliation(s)
- T Y Wu
- Institute of Molecular Biology, Academia Sinica, Nankang, Taipei 115, Taiwan, ROC
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30
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Chou HK, Chen SL, Hsu CT, Chao YC, Tsao YP. Bcl-2 accelerates retinoic acid-induced growth arrest and recovery in human gastric cancer cells. Biochem J 2000; 348 Pt 2:473-9. [PMID: 10816444 PMCID: PMC1221088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The role of Bcl-2 as an anti-apoptotic protein has been well documented. In the present work, we present evidence that Bcl-2 may also be involved in cell growth regulation. SC-M1 is an unique cell line which responds to retinoic acid (RA) treatment with reversible growth arrest [Shyu, Jiang, Huang, Chang, Wu, Roffler and Yeh (1995) Eur. J. Cancer 31, 237-243]. In this study, when treated with RA, SC-M1/Bcl2 cells, which were generated by transfecting SC-M1 cells with bcl-2 DNA, were growth-arrested two days earlier than SC-M1/neo cells, which were generated by transfecting SC-M1 cells with vector DNA. This indicates that Bcl-2 accelerates RA-induced growth arrest. In addition to the accelerated growth arrest, RA-treated SC-M1/Bcl2 cells also recovered from growth arrest two days faster than SC-M1/neo cells after the removal of RA. Previously, we had identified the cyclin-dependent kinase inhibitor p21((WAF1/CIP1)) (p21) as a mediator of RA-induced growth arrest [Tsao, Li, Kuo, Liu and Chen (1996) Biochem. J. 317, 707-711]. In a search for the mechanism by which Bcl-2 affects growth regulation, we found that p21 gene expression was more prominent in SC-M1/Bcl2 cells than in SC-M1/neo cells in the presence of RA, but when RA was removed, p21 gene expression levels in SC-M1/Bcl2 cells were also reduced earlier than in SC-M1/neo cells. The present report is the first to show that Bcl-2 accelerates not only growth arrest but also recovery from growth arrest. Moreover, the close correlation between the effect of Bcl-2 on both RA-induced growth arrest and RA-induced p21 gene expression suggests the possibility that Bcl-2 affects cell growth through the mechanism of p21.
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Affiliation(s)
- H K Chou
- Department of Microbiology and Immunology, National Defense Medical Center, Taipei, Taiwan, Republic of China
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Ko BT, Chao YC, Lin CC. Conformation of heterocycles controlled by the existence of unusual C-H...X hydrogen bonds: syntheses and structure determination of aluminum aryloxides. Inorg Chem 2000; 39:1463-9. [PMID: 12526450 DOI: 10.1021/ic9909835] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of AlMe3 in diethyl ether with 1 molar equiv of 2,2'-methylenebis(4-methyl-6-tert-butylphenol) (MMBP-H2), 2,2'-methylenebis(4,6-di-tert-butylphenol) (MDBP-H2), and 2,2'-ethylidenebis(4,6-di-tert-butylphenol) (EDBP-H2) afford series of four-coordinate monomeric aluminum aryloxides, MeAl(O-O)(OEt2), 1-3 (1, (O-O) = MMBP; 2, (O-O) = MDBP; 3, (O-O) = EDBP). In THF, 1 molar equiv of EDBP-H2 reacts with AlMe3 to provide the THF-coordinated complex MeAl(EDBP)(THF) 4. However, in the absence of a coordinating solvent, the reaction of EDBP-H2 with AlMe3 yields the dimeric complex [MeAl(mu-EDBP)]2 (5). Complex 5 further reacts with Et4NCl, Et4NBr, and Ph3PO to afford the corresponding monomeric ionic complex [Et4N][MeAl(EDBP)(X)] (6, X = Cl; 7, X = Br) and the neutral complex [MeAl(EDBP)(O=PPh3)] (8), respectively. Complexes 1, 2, 4 and 6-8 are subjected to X-ray structure analyses, and the solid state structures reveal that the conformations of the eight-membered heterocycles are governed by the formation of the unusual C-H...X hydrogen bonds.
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Affiliation(s)
- B T Ko
- Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan, R.O.C
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Yan JC, Chao YC, Chang WG, Young TH, Shyu RY. Chronic idiopathic intestinal pseudo-obstruction. Zhonghua Yi Xue Za Zhi (Taipei) 2000; 63:251-5. [PMID: 10746424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Chronic idiopathic intestinal pseudo-obstruction (CIIP) is a rare heterogeneous clinical syndrome characterized by recurrent episodes of symptoms and signs of intestinal obstruction in the absence of a mechanically obstructing lesion. Dilatation of other viscera, such as the renal pelvis, ureter or urinary bladder, is identified in a minority of patients. We report the cases of two patients with CIIP presenting with abdominal fullness and constipation. Radiologic examination of the first patient revealed dilatation of the esophagus, stomach, duodenum and bowel loops up to the ascending colon. The nerve conduction velocity study of the right extremities revealed polyneuropathy and urinary bladder manometry revealed poor sensation. The patient had been admitted to our hospital three times for symptomatic relief within the prior six months. During the last admission, his symptoms persisted without response to medical treatment. Soon after discharge, the patient underwent surgery at another hospital and died of nutritional problems. The second patient was transferred to our hospital after an exploratory laparotomy was performed one month earlier. A radiographic examination revealed distention of the stomach, duodenum, small intestine and ascending colon, as well as bilateral hydronephrosis. Rheumatologic examination revealed no evidence of autoimmune disorder. The patient also had heavy proteinuria due to minimal change disease that was proven by renal biopsy. After receiving prokinetic, cathartic and corticosteroid medication for kidney disease, symptoms improved, but hydronephrosis persisted.
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Affiliation(s)
- J C Yan
- Department of Internal Medicine, China Medical Center Hospital, Taichung, ROC
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Affiliation(s)
- J Liaw
- Department of Pharmaceutics, School of Pharmacy, Taipei Medical College, Taiwan.
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Affiliation(s)
- W H Huang
- Division of Gastroenterology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
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Lin CL, Lee JC, Chen SS, Wood HA, Li ML, Li CF, Chao YC. Persistent Hz-1 virus infection in insect cells: evidence for insertion of viral DNA into host chromosomes and viral infection in a latent status. J Virol 1999; 73:128-39. [PMID: 9847315 PMCID: PMC103816 DOI: 10.1128/jvi.73.1.128-139.1999] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [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: 11/20/2022] Open
Abstract
Persistent/latent viral infections of insect cells are a prominent though poorly understood phenomenon. In this study, the long-term association between the Hz-1 virus and insect host cells, conventionally referred to as persistent viral infection, is described. With the aid of a newly developed fluorescent cell-labeling system, we found that productive viral replication occurs by spontaneous viral reactivation in fewer than 0.2% of persistently infected cell lines over a 5-day period. Once viral reactivation takes place, the host cell dies. The persistently infected cells contain various amounts of viral DNA, and, in an extreme case, up to 16% of the total DNA isolated from infected cells could be of viral origin. Both pulsed-field gel electrophoresis and in situ hybridization experiments showed that some of these viral DNA molecules are inserted into the host chromosomes but that the rest of viral DNA copies are free from host chromosomes. Thus, Hz-1 virus is the first nonretroviral insect virus known to insert its genome into the host chromosome during the infection process. These data also suggest that the previously described persistent infection of Hz-1 virus in insect cells should be more accurately referred to as latent viral infection.
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Affiliation(s)
- C L Lin
- Department of Biology, National Taiwan Normal University, Taipei 115, Taiwan, Republic of China
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Young TH, Shyu RY, Chao YC, Huang WS, Yan JC, Tang HS. Visualization of a photopenic lesion secondary to a giant small bowel diverticulum with fecal retention during Meckel's scintigraphy. Clin Nucl Med 1998; 23:857-8. [PMID: 9858309 DOI: 10.1097/00003072-199812000-00022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- T H Young
- Department of Internal Medicine, Tri-Service General Hospital, Taipei, Taiwan, Republic of China
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Abstract
Infection with the wild-type baculovirus Autographa californica multiple nuclear polyhedrosis virus (AcMNPV) results in complete death of Spodoptera frugiperda (Sf) cells. However, infection of Sf cells with AcMNPV carrying a mutation or deletion of the apoptotic suppressor gene p35 allowed the cloning of surviving Sf cells that harbored persistent viral genomes. Persistent infection established with the virus with p35 mutated or deleted was blocked by stable transfection of p35 in the host genome or by insertion of the inhibitor of apoptosis (iap) gene into the viral genome. These artificially established persistently virus-infected cells became resistant to subsequent viral challenge, and some of the cell lines carried large quantities of viral DNA capable of early gene expression. Continuous release of viral progenies was evident in some of the persistently virus-infected cells, and transfection of p35 further stimulated viral activation of the persistent cells, including the reactivation of viruses in those cell lines without original continuous virus release. These results have demonstrated the successful establishment of persistent baculovirus infections under laboratory conditions and that their establishment may provide a novel continuous, nonlytic baculovirus expression system in the future.
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Affiliation(s)
- J C Lee
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 115, Taiwan, Republic of China
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38
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Affiliation(s)
- T H Young
- Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
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39
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Young TH, Chao YC, Tang HS. Isolated rupture of the right hemidiaphragm with eventration of the liver demonstrated by liver scan. Clin Nucl Med 1998; 23:703-4. [PMID: 9790051 DOI: 10.1097/00003072-199810000-00015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- T H Young
- Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
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41
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Affiliation(s)
- T H Young
- Department of Internal Medicine, Tri-Service General Hospital, and the National Defense Medical Center, Taipei, Taiwan, Republic of China
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42
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Lee JC, Chao YC. Apoptosis resulting from superinfection of Heliothis zea virus 1 is inhibited by p35 and is not required for virus interference. J Gen Virol 1998; 79 ( Pt 9):2293-300. [PMID: 9747740 DOI: 10.1099/0022-1317-79-9-2293] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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: 11/18/2022] Open
Abstract
Superinfection of Spodoptera frugiperda insect cells that are persistently infected with Heliothis zea 1 (Hz-1) virus induces general cellular apoptosis and subsequently results in homologous virus interference. Since apoptosis correlates closely with both a significant decrease in yield of virus progeny and expansion of virus infection among cells, further experiments were designed to verify the direct association of apoptosis with homologous interference. It was found that superinfection-induced apoptosis can be efficiently blocked by the stable transfection of p35 into cells before or after the establishment of persistent virus infection. However, persistently infected cells are still strongly resistant to the challenge of Hz-1 virus, indicating that the induction of apoptosis is not essential for the resulting homologous Hz-1 virus interference. Replication and transcription of viral genomes are greatly retarded upon Hz-1 virus superinfection of persistently infected cells, whether stably transfected with p35 or not, suggesting that upon superinfection, the decreasing yield of virus progeny in these persistently infected cells is caused by a blockage early after virus infection.
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Affiliation(s)
- J C Lee
- Graduate Institute of Life Sciences, National Defence Medical Center, Taipei, Taiwan, Republic of China
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Abstract
Using a bioassay-directed fractionation method, three new compounds, including an aporphine alkaloid, cassyformine (4); an oxoaporphine alkaloid, filiformine (8), and a lignan, (+)-diasyringaresinol (10), along with 14 known compounds, were further isolated and characterized from the MeOH extract of the fresh herbs of Cassytha filiformis. Among the isolates of this plant, cathafiline (1), cathaformine (2), actinodaphnine (3), N-methylactinodaphnine (5), predicentrine (6), and ocoteine (7) exhibited significant antiplatelet aggregation activity.
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Affiliation(s)
- F R Chang
- Graduate Institute of Natural Products, Kaohsiung Medical College, Kaohsiung 807, Taiwan, Republic of China
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44
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Chao YC, Lee ST, Chang MC, Chen HH, Chen SS, Wu TY, Liu FH, Hsu EL, Hou RF. A 2.9-kilobase noncoding nuclear RNA functions in the establishment of persistent Hz-1 viral infection. J Virol 1998; 72:2233-45. [PMID: 9499081 PMCID: PMC109520 DOI: 10.1128/jvi.72.3.2233-2245.1998] [Citation(s) in RCA: 28] [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: 02/06/2023] Open
Abstract
Differential viral gene expression during both productive and persistent infections of Hz-1 virus in insect cells was elucidated. Despite more than 100 viral transcripts being expressed during productive viral infection, massive viral gene shutoff was observed during viral persistency, leaving the 2.9-kb persistence-associated transcript 1 (PAT1) as the only detectable viral RNA. Persistence-associated gene 1 (pag1), which encodes PAT1, was cloned and found to contain no significant open reading frames. PAT1 is not associated with the cellular translation machinery and is located exclusively in the nucleus. Further experiments showed that PAT1 is functional in the establishment of persistent Hz-1 viral infection in the cells. All the evidence collectively indicates that PAT1 is a novel nuclear transcript of viral origin. Our results showed that although PAT1 and XIST RNA, a mammalian X-inactive specific transcript, are transcribed by different genes, they have interesting similarities.
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Affiliation(s)
- Y C Chao
- Institute of Molecular Biology, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China.
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Affiliation(s)
- T H Young
- Department of Internal Medicine, National Defense Medical Center, Taipei, Taiwan, Republic of China
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Chang WK, Chao YC, Tang HS, Lang HF, Hsu CT. Effects of extra-carbohydrate supplementation in the late evening on energy expenditure and substrate oxidation in patients with liver cirrhosis. JPEN J Parenter Enteral Nutr 1997; 21:96-9. [PMID: 9084012 DOI: 10.1177/014860719702100296] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.5] [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: 02/04/2023]
Abstract
BACKGROUND The purpose of this study was to demonstrate the effects of extra-carbohydrate supplementation before bedtime on energy metabolism and substrate oxidation in patients with liver cirrhosis. METHODS Sixteen cirrhotic patients and eight control subjects were included in this study. To compare the effect of energy metabolism and substrate oxidation with or without a bedtime snack, indirect calorimetry was assessed at 7 to 8 AM after overnight fasting, following either dinner (6 PM) or a bedtime snack (11 PM) the evening before. The bedtime snack contained about 50 g of carbohydrate. The energy expenditure and substrate oxidation were calculated from the indirect calorimetry measurement and 24-hour urinary nitrogen excretion. RESULTS In those who fasted since dinner, the respiratory quotient (RQ) was significantly lower in cirrhotic patients than in control subjects. Also, the energy utilized by cirrhotic patients was derived primarily from fat oxidation (58%), whereas the main energy source for controls was carbohydrate (55%). An extra-carbohydrate supplement before bedtime did not influence the indirect calorimetry measurement in the controls, but there were significant increases in both RQ and carbon dioxide production (Vco2) in cirrhotic patients. The extra-carbohydrate supplementation did not significantly change the absolute resting energy expenditure utilization in control subjects; however, the utilization of carbohydrate significantly increased with a decrease in fat and protein oxidation in the cirrhotic patients. CONCLUSIONS These preliminary data suggest that extra-carbohydrate supplementation before bedtime can shorten nocturnal fasting with a more economic fuel utilization and effectively diminish fat and protein oxidation in cirrhotic patients.
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Affiliation(s)
- W K Chang
- Department of Internal Medicine, Tri-Service General Hospital, Taipei, Taiwan, Republic of China
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Abstract
It is still not clear why some alcoholic patients acquire certain organ-specific complications of alcoholism whereas other alcoholic patients acquire different ones. As we know the liver alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH), and cytochrome P4502E1 (P4502E1) are polymorphic at the ADH2, ADH3, and ALDH2 loci and the 5'-flanking region of the P4502E1. The aim of this study was to investigate the differences between Chinese alcoholic patients with cirrhosis and acute pancreatitis by studying the genetic polymorphisms of ADH2, ADH3, ALDH2, and P4502E1. Genotyping of ADH2, ADH3, ALDH2, and P4502E1 was performed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) methods on peripheral white blood cell DNA from 75 alcoholic cirrhotic patients, 48 acute alcoholic pancreatitis patients, 19 heavy drinkers without liver disease or pancreatitis, and 235 controls. The results showed that the frequencies of the alleles ADH2*1 and ALDH2*1 in the alcoholic cirrhotic patients were significantly higher than those in the nonalcoholic controls. In acute alcoholic pancreatitis patients, only the frequency of allele ALDH2*1, not ADH2*1 was significantly higher than in the nonalcoholic controls. The allele frequency of ADH2*1 in acute pancreatitis patients was significantly lower (P < .01) than in alcoholic cirrhotic patients. The daily amount of alcohol consumption was significantly lower in patients with acute pancreatitis than in patients with cirrhosis (P < .0005). The genotype distributions of P4502E1, detected by RsaI and PstI, were not different among alcoholic cirrhotic patients, alcoholic pancreatitis patients, heavy drinker, and nonalcoholic controls. In conclusion, ALDH2*1 is the most important alcohol metabolizing gene affecting predisposition to alcoholism whereas the ADH2*2 gene may influence susceptibility to acute alcoholic pancreatitis. The patients with alcohol-induced cirrhosis and with alcohol-induced acute pancreatitis are of two different subpopulations.
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Affiliation(s)
- Y C Chao
- Division of Gastroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
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Young TH, Ho AS, Tang HS, Hsu CT, Lee HS, Chao YC. Cystic lymphangioma of the transverse colon: report of a case and review of the literature. Abdom Imaging 1996; 21:415-7. [PMID: 8832861 DOI: 10.1007/s002619900094] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A 32-year-old Chinese man with cystic lymphangioma of the transverse colon is described. He presented with a 1-year history of altered bowel habits. Double-contrast barium enema study demonstrated a submucosal lesion in the midportion of the transverse colon with intact mucosa. Computed tomography (CT) showed a round 3.0-cm submucosal cystic mass lesion. Colonoscopy revealed a smooth, soft polypoid mass on a broad base. He underwent segmental resection of the colon. Histologically, the lesion was characterized by cystic lymphangioma originating from the submucosa. The clinical features, radiology, appropriate treatment, and possible pathogenesis of colonic lymphangioma are discussed.
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Affiliation(s)
- T H Young
- Division of Gastroenterology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, 40 Sec. 3, Ting-Chow Road, Taipei, Taiwan, Republic of China
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