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Kao CT, Ho CT, Huang TH. The aspiration of primary second molar at the right bronchial bifurcation. J Dent Sci 2024; 19:1259-1260. [PMID: 38618061 PMCID: PMC11010669 DOI: 10.1016/j.jds.2023.10.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 10/20/2023] [Indexed: 04/16/2024] Open
Affiliation(s)
- Chia-Tze Kao
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chun-Te Ho
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
- Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Tsui-Hsien Huang
- Corresponding author. School of Dentistry, Chung Shan Medical University, No. 110, Section 1, Chien-Kuo N. Rd., Taichung, 40201, Taiwan.
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2
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Abstract
Background/purpose The strength of aligners themselves has a high decay rate and is susceptible to accelerated degradation in the environment. The purpose of this study was to compare three types of invisible aligner films after being immersed in coffee, tea, cola, and red wine for seven days and to evaluate the changes in their strengths. Materials and methods Three types of invisible aligner plates with a thickness of 0.75 mm, i.e., Duran T (polyethylene terephthalate glycol, PETG), Biolon (polyethylene terephthalate, PET), and Zendura FLX (polyurethane, PU), were soaked in artificial saliva and four drinks (coffee, tea, cola, red wine) for 1, 4, and 7 days. The strength test was performed by using the three-point bending test method. The residual strength ratio for the same type of invisible correction film at the same time was separately recorded. The independent t-test was used to indicate significant differences at P < 0.05. Results The Biolon invisible correction film soaked in cola, red wine and artificial saliva showed significant differences on the 1st and 4th days (P < 0.05). The Duran T invisible correction film soaked in coffee and artificial saliva showed significant differences on the first day (P < 0.05). The Zendura FLX invisible correction film had a waterproof layer on the surface, and there was no significant difference between soaking in any drink and soaking in saliva (P > 0.05). Conclusion Invisible correction films with different ingredients soaked in solutions show a strength decay phenomenon, except for those with TPU ingredients.
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Affiliation(s)
- Shou-Min Chen
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Tsui-Hsein Huang
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
- Dental Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chun-Te Ho
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chia-Tze Kao
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
- Dental Department, Chung Shan Medical University Hospital, Taichung, Taiwan
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3
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Chen SM, Ho CT, Huang TH, Kao CT. An in vitro evaluation of aligner force decay in artificial saliva. J Dent Sci 2023; 18:1347-1353. [PMID: 37404637 PMCID: PMC10316483 DOI: 10.1016/j.jds.2023.04.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 04/18/2023] [Indexed: 07/06/2023] Open
Abstract
Background/purpose The present study aimed to compare the force decay of invisible aligners for maxillary anterior teeth with 0.1 mm (D1), 0.2 mm (D2), and 0.3 mm (D3) labial movement within a simulated oral environment over 7 days. Materials and methods The prepared invisible aligners were immersed in saliva (S) and subjected to applied force (F) for 7 days. The aligners were set and placed on the maxillary right central incisor with 0.1 mm (D1), 0.2 mm (D2), and 0.3 mm (D3) labial movement. Thin-film pressure sensors were used to measure the aligner force changes. The data were collected and analyzed by statistical methods. Results Significant differences were observed in the initial and first-day force between the D2 and D3 groups under simulated oral environment force (SF) (P < 0.05). There was a significant difference in force decay between Day 1 and Day 7 for all groups (P < 0.05). The SFD1 group showed a significant decrease in force on Day 5 (P < 0.05), while the SFD2 and SFD3 groups showed significant force decay on Day 4 (P < 0.05). The force decay ratio on Day 7 was higher in the SFD3 group than in the SFD1 and SFD2 groups, but no significant difference was observed. Conclusion Larger labial movement of the aligners resulted in higher force decay under artificial saliva environments, and the force decay of invisible aligners was increased by immersion time in artificial saliva.
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Affiliation(s)
- Shou-Min Chen
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chun-Te Ho
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Tsui-Hsein Huang
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
- Dental Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chia-Tze Kao
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
- Dental Department, Chung Shan Medical University Hospital, Taichung, Taiwan
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4
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Ho CT, Tai WK, Kao CT. Simple treatment for beauty is not always the best: A corrective surgery. J Dent Sci 2022; 18:898-900. [PMID: 37021208 PMCID: PMC10068371 DOI: 10.1016/j.jds.2022.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 11/08/2022] [Accepted: 11/09/2022] [Indexed: 11/27/2022] Open
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5
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Lin CY, Wang YL, Chen YJ, Ho CT, Chi YH, Chan LY, Chen GW, Hsu HC, Hwang DW, Wu HC, Hung SC. Collagen-binding peptides for the enhanced imaging, lubrication and regeneration of osteoarthritic articular cartilage. Nat Biomed Eng 2022; 6:1105-1117. [PMID: 36229661 DOI: 10.1038/s41551-022-00948-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 09/02/2022] [Indexed: 01/15/2023]
Abstract
Treatments for osteoarthritis would benefit from the enhanced visualization of injured articular cartilage and from the targeted delivery of disease-modifying drugs to it. Here, by using ex vivo human osteoarthritic cartilage and live rats and minipigs with induced osteoarthritis, we report the application of collagen-binding peptides, identified via phage display, that are home to osteoarthritic cartilage and that can be detected via magnetic resonance imaging when conjugated with a superparamagnetic iron oxide. Compared with the use of peptides with a scrambled sequence, hyaluronic acid conjugated with the collagen-binding peptides displayed enhanced retention in osteoarthritic cartilage and better lubricated human osteoarthritic tissue ex vivo. Mesenchymal stromal cells encapsulated in the modified hyaluronic acid and injected intra-articularly in rats showed enhanced homing to osteoarthritic tissue and improved its regeneration. Molecular docking revealed WXPXW as the consensus motif that binds to the α1 chain of collagen type XII. Peptides that specifically bind to osteoarthritic tissue may aid the diagnosis and treatment of osteoarthritic joints.
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Affiliation(s)
- Chin-Yu Lin
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan
| | - Yung-Li Wang
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan
| | - Yu-Jen Chen
- Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan
| | - Chun-Te Ho
- Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan
| | - Yi-Hsuan Chi
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Long Yi Chan
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan
| | - Guan-Wen Chen
- Molecular Science Center, GGA Corporation, Taipei, Taiwan
| | - Horng-Chaung Hsu
- Department of Medicine, School of Medicine, China Medical University, Taichung, Taiwan.,Department of Orthopaedics, China Medical University Hospital, Taichung, Taiwan
| | - Dennis W Hwang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Han-Chung Wu
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan.
| | - Shih-Chieh Hung
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan. .,Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan. .,Department of Orthopaedics, China Medical University Hospital, Taichung, Taiwan.
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Ho CT, Lin SP, Tseng LM, Hung MC, Hung SC. Snail induces dormancy in disseminated luminal type A breast cancer through Src inhibition. Am J Cancer Res 2022; 12:3932-3946. [PMID: 36119827 PMCID: PMC9442010] [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: 06/16/2022] [Accepted: 07/28/2022] [Indexed: 06/15/2023] Open
Abstract
Breast cancer includes biologically distinct subtypes, and the time between rise in distant metastases and overall survival for the subtypes are different. The mechanisms involved in these differences in tumor metastasis remain to be elucidated. Here, we demonstrated that, luminal type A breast cancer cells, such as MCF7 and T47D, when overexpressed with active mutant form of Snail (6SA-Snail) increased in the expression of EMT markers such as Vimentin, N-cadherin and Fibronectin but decreased in the expression of E-cadherin, compared to control vectors or wild type Snail. Moreover, this mutant increased in migration and invasion ability, while decreased in the capacity to survive and form spheres in tumor spheroid medium. Luciferase reporter assay and chromatin immunoprecipitation followed by quantitative PCR (ChIP-qPCR) analysis revealed that Snail downregulated Src by binding to the E-box of Src promoter. Human luminal type A breast cancer specimens showed an inverse correlation between Vimentin and Src expression. Most importantly, downregulation of Src by Snail was not found in breast cancer cell types other than luminal type A. Therefore, elucidation of the differences in signaling pathways involved in controlling migration, invasion and colonization may have a therapeutically beneficial effect on breast cancer treatment.
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Affiliation(s)
- Chun-Te Ho
- Integrative Stem Cell Center, Department of Orthopaedics, China Medical University HospitalTaichung 404, Taiwan
| | - Shih-Pei Lin
- Drug Development Center, Institute of New Drug Development, China Medical UniversityTaichung 404, Taiwan
| | - Ling-Ming Tseng
- Department of Surgery, Taipei Veterans General HospitalTaipei 112, Taiwan
- School of Medicine, College of Medicine, National Yang-Ming Chiao Tung UniversityTaipei 112, Taiwan
| | - Mien-Chie Hung
- Graduate Institute of Biomedical Sciences, Research Center for Cancer Biology and Center for Molecular Medicine, China Medical UniversityTaichung 404, Taiwan
| | - Shih-Chieh Hung
- Drug Development Center, Institute of New Drug Development, China Medical UniversityTaichung 404, Taiwan
- Integrative Stem Cell Center, Department of Orthopaedics, China Medical University HospitalTaichung 404, Taiwan
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7
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Cheng HW, Ho CT, Kao CT. A useful method to correct early unilateral posterior crossbite. J Dent Sci 2022; 17:1401-1402. [PMID: 35784128 PMCID: PMC9236963 DOI: 10.1016/j.jds.2022.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/10/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- Hui-Wen Cheng
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chun-Te Ho
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Chia-Tze Kao
- Orthodontic Department, Chung Shan Medical University Hospital, Taichung, Taiwan
- School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan
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Abstract
A rotator cuff tear is an age-related common cause of pain and disability. Studies including our previously published ones have demonstrated that mesenchymal stem cells cultured under hypoxic conditions [hypoxic multipotent stromal cells (MSCs)] facilitate the retention of transplanted cells and promote wound healing. However, there are very few, if any, reports targeting the punctured supraspinatus tendons to create more or equally serous wounds as age-related tears of rotator cuff. It remains to be determined whether transplantation of bone-marrow-derived hypoxic MSCs into the punctured supraspinatus tendon improves tendon repair and, when combined with ultrasound-guided delivery, could be used for future clinical applications. In this study, we used a total of 33 Sprague-Dawley rats in different groups for normal no-punched control, hypoxic MSC treatment, nontreated vehicle control, and MSC preparation, and then evaluated treatment outcomes by biomechanical testing and histological analysis. We found that the ultimate failure load of the hypoxic MSC-treated group was close to that of the normal tendon and significantly greater than that of the nontreated vehicle control group. In vivo tracking of cells labeled with superparamagnetic iron oxide (SPIO) nanoparticles revealed an enhanced retention of transplanted cells at the tear site. Our study demonstrates that hypoxic MSCs improve rotator cuff tear repair in a rat model.
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Affiliation(s)
- Hsin-Shui Chen
- PhD Program for Aging, College of Medicine, China Medical University, Taichung.,Department of Physical Medicine & Rehabilitation, National Taiwan University Hospital Yunlin Branch, Yunlin
| | - Yun-Chain Yau
- Department of Biomedical Imaging and Radiological Sciences, National Yang Ming Chiao Tung University, Taipei
| | - Pin-Tsou Ko
- Department of Pathology, An-Nan Hospital, China Medical University, Tainan
| | - Betty Lin-Ju Yen
- Institute of Cellular & System Medicine, Regenerative Medicine Research Group, National Health Research Institutes, Zhunan
| | - Chun-Te Ho
- Institute of New Drug Development, China Medical University, Taichung.,Integrative Stem Cell Center, China Medical University Hospital, Taichung
| | - Shih-Chieh Hung
- Institute of New Drug Development, China Medical University, Taichung.,Integrative Stem Cell Center, China Medical University Hospital, Taichung
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Yen YT, Chien M, Wu PY, Ho CC, Ho CT, Huang KCY, Chiang SF, Chao KSC, Chen WTL, Hung SC. Protein phosphatase 2A inactivation induces microsatellite instability, neoantigen production and immune response. Nat Commun 2021; 12:7297. [PMID: 34911954 PMCID: PMC8674339 DOI: 10.1038/s41467-021-27620-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 12/02/2021] [Indexed: 12/21/2022] Open
Abstract
Microsatellite-instable (MSI), a predictive biomarker for immune checkpoint blockade (ICB) response, is caused by mismatch repair deficiency (MMRd) that occurs through genetic or epigenetic silencing of MMR genes. Here, we report a mechanism of MMRd and demonstrate that protein phosphatase 2A (PP2A) deletion or inactivation converts cold microsatellite-stable (MSS) into MSI tumours through two orthogonal pathways: (i) by increasing retinoblastoma protein phosphorylation that leads to E2F and DNMT3A/3B expression with subsequent DNA methylation, and (ii) by increasing histone deacetylase (HDAC)2 phosphorylation that subsequently decreases H3K9ac levels and histone acetylation, which induces epigenetic silencing of MLH1. In mouse models of MSS and MSI colorectal cancers, triple-negative breast cancer and pancreatic cancer, PP2A inhibition triggers neoantigen production, cytotoxic T cell infiltration and ICB sensitization. Human cancer cell lines and tissue array effectively confirm these signaling pathways. These data indicate the dual involvement of PP2A inactivation in silencing MLH1 and inducing MSI.
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Affiliation(s)
- Yu-Ting Yen
- grid.254145.30000 0001 0083 6092Drug Development Center, Institute of New Drug Development, China Medical University, Taichung, 40402 Taiwan ,grid.411508.90000 0004 0572 9415Integrative Stem Cell Center, China Medical University Hospital, Taichung, 40402 Taiwan
| | - May Chien
- grid.254145.30000 0001 0083 6092Drug Development Center, Institute of New Drug Development, China Medical University, Taichung, 40402 Taiwan ,grid.411508.90000 0004 0572 9415Integrative Stem Cell Center, China Medical University Hospital, Taichung, 40402 Taiwan
| | - Pei-Yi Wu
- grid.254145.30000 0001 0083 6092Drug Development Center, Institute of New Drug Development, China Medical University, Taichung, 40402 Taiwan ,grid.411508.90000 0004 0572 9415Integrative Stem Cell Center, China Medical University Hospital, Taichung, 40402 Taiwan
| | - Chi-Chang Ho
- grid.254145.30000 0001 0083 6092Drug Development Center, Institute of New Drug Development, China Medical University, Taichung, 40402 Taiwan ,grid.411508.90000 0004 0572 9415Integrative Stem Cell Center, China Medical University Hospital, Taichung, 40402 Taiwan
| | - Chun-Te Ho
- grid.254145.30000 0001 0083 6092Drug Development Center, Institute of New Drug Development, China Medical University, Taichung, 40402 Taiwan ,grid.411508.90000 0004 0572 9415Integrative Stem Cell Center, China Medical University Hospital, Taichung, 40402 Taiwan
| | - Kevin Chih-Yang Huang
- grid.254145.30000 0001 0083 6092Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, 40402 Taiwan ,grid.254145.30000 0001 0083 6092Translation Research Core, China Medical University Hospital, China Medical University, Taichung, 40402 Taiwan
| | - Shu-Fen Chiang
- grid.254145.30000 0001 0083 6092Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, Taiwan 40402 ROC ,grid.454740.6Lab of Precision Medicine, Feng-Yuan Hospital, Ministry of Health and Welfare, Taichung, 42055 Taiwan
| | - K. S. Clifford Chao
- grid.254145.30000 0001 0083 6092Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, Taiwan 40402 ROC
| | - William Tzu-Liang Chen
- grid.254145.30000 0001 0083 6092Department of Colorectal Surgery, China Medical University Hospital, China Medical University, Taichung, 40402 Taiwan ,grid.254145.30000 0001 0083 6092Department of Colorectal Surgery, China Medical University HsinChu Hospital, China Medical University, HsinChu, 302 Taiwan
| | - Shih-Chieh Hung
- Drug Development Center, Institute of New Drug Development, China Medical University, Taichung, 40402, Taiwan. .,Integrative Stem Cell Center, China Medical University Hospital, Taichung, 40402, Taiwan. .,Department of Orthopaedics, China Medical University Hospital, Taichung, 40402, Taiwan.
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10
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Shen PW, Ho CT, Hsiao SH, Chou YT, Chang YC, Liu JJ. Disruption of Cytosolic Folate Integrity Aggravates Resistance to Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors and Modulates Metastatic Properties in Non-Small-Cell Lung Cancer Cells. Int J Mol Sci 2021; 22:ijms22168838. [PMID: 34445544 PMCID: PMC8396212 DOI: 10.3390/ijms22168838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 07/29/2021] [Accepted: 08/13/2021] [Indexed: 01/04/2023] Open
Abstract
Patients with advanced-stage non-small-cell lung cancer (NSCLC) are susceptible to malnutrition and develop folate deficiency (FD). We previously found that folate deprivation induces drug resistance in hepatocellular carcinoma; here, we assessed whether disrupted cytoplasmic folate metabolism could mimic FD-induced metastasis and affect the sensitivity of NSCLC cells to epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs). We examined whether cytosolic folate metabolism in NSCLC cells was disrupted by FD or the folate metabolism blocker pemetrexed for 1–4 weeks. Our results revealed an increase in NF-κB overexpression–mediated epithelial-mesenchymal transition biomarkers: N-cadherin, vimentin, matrix metalloproteinases (MMPs), SOX9, and SLUG. This finding suggests that the disruption of folate metabolism can drastically enhance the metastatic properties of NSCLC cells. Cytosolic FD also affected EGFR-TKI cytotoxicity toward NSCLC cells. Because SLUG and N-cadherin are resistance effectors against gefitinib, the effects of SLUG knockdown in folate antagonist–treated CL1-0 cells were evaluated. SLUG knockdown prevented SLUG/NF-κB/SOX9-mediated invasiveness and erlotinib resistance acquisition and significantly reduced pemetrexed-induced gelatinase activity and MMP gene expression. To summarize, our data reveal two unprecedented adverse effects of folate metabolism disruption in NSCLC cells. Thus, the folic acid status of patients with NSCLC under treatment can considerably influence their prognosis.
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Affiliation(s)
- Po-Wen Shen
- Program in Molecular Medicine, National Yang Ming Chiao Tung University and Academia Sinica, Taipei 112, Taiwan;
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan;
| | - Chun-Te Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Shih-Hsin Hsiao
- Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei 110, Taiwan;
| | - Yu-Ting Chou
- Department of Life Science, National Tsing Hua University, Hsinchu 300, Taiwan;
| | - Yi-Cheng Chang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan;
- Department of Internal Medicine, National Taiwan University Hospital, Taipei 110, Taiwan
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University, Taipei 110, Taiwan
| | - Jun-Jen Liu
- School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei 110, Taiwan
- Ph.D. Program in Medical Biotechnology, Taipei Medical University, Taipei 110, Taiwan
- Ph.D. Program in Biotechnology Research and Development, Taipei Medical University, Taipei 110, Taiwan
- Correspondence: ; Tel.: +886-2-27361661
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11
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Ho CT, Wu MH, Chen MJ, Lin SP, Yen YT, Hung SC. Combination of Mesenchymal Stem Cell-Delivered Oncolytic Virus with Prodrug Activation Increases Efficacy and Safety of Colorectal Cancer Therapy. Biomedicines 2021; 9:548. [PMID: 34068264 PMCID: PMC8153168 DOI: 10.3390/biomedicines9050548] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/04/2021] [Accepted: 05/11/2021] [Indexed: 12/24/2022] Open
Abstract
Although oncolytic viruses are currently being evaluated for cancer treatment in clinical trials, systemic administration is hindered by many factors that prevent them from reaching the tumor cells. When administered systemically, mesenchymal stem cells (MSCs) target tumors, and therefore constitute good cell carriers for oncolytic viruses. MSCs were primed with trichostatin A under hypoxia, which upregulated the expression of CXCR4, a chemokine receptor involved in tumor tropism, and coxsackievirus and adenovirus receptor that plays an important role in adenoviral infection. After priming, MSCs were loaded with conditionally replicative adenovirus that exhibits limited proliferation in cells with a functional p53 pathway and encodes Escherichia coli nitroreductase (NTR) enzymes (CRAdNTR) for targeting tumor cells. Primed MSCs increased tumor tropism and susceptibility to adenoviral infection, and successfully protected CRAdNTR from neutralization by anti-adenovirus antibodies both in vitro and in vivo, and specifically targeted p53-deficient colorectal tumors when infused intravenously. Analyses of deproteinized tissues by UPLC-MS/QTOF revealed that these MSCs converted the co-administered prodrug CB1954 into cytotoxic metabolites, such as 4-hydroxylamine and 2-amine, inducing oncolysis and tumor growth inhibition without being toxic for the host vital organs. This study shows that the combination of oncolytic viruses delivered by MSCs with the activation of prodrugs is a new cancer treatment strategy that provides a new approach for the development of oncolytic viral therapy for various cancers.
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Affiliation(s)
- Chun-Te Ho
- Drug Development Center, Institute of New Drug Development, Institute of Biomedical Sciences, School of Medicine, China Medical University, Taichung 404, Taiwan; (C.-T.H.); (Y.-T.Y.)
- Integrative Stem Cell Center, Department of Orthopaedics, China Medical University Hospital, Taichung 404, Taiwan
| | - Mei-Hsuan Wu
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan; (M.-H.W.); (S.-P.L.)
| | - Ming-Jen Chen
- Department of Surgery, MacKay Memorial Hospital & Department of Medicine, MacKay Medical College, New Taipei City 252, Taiwan;
| | - Shih-Pei Lin
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan; (M.-H.W.); (S.-P.L.)
| | - Yu-Ting Yen
- Drug Development Center, Institute of New Drug Development, Institute of Biomedical Sciences, School of Medicine, China Medical University, Taichung 404, Taiwan; (C.-T.H.); (Y.-T.Y.)
- Integrative Stem Cell Center, Department of Orthopaedics, China Medical University Hospital, Taichung 404, Taiwan
| | - Shih-Chieh Hung
- Drug Development Center, Institute of New Drug Development, Institute of Biomedical Sciences, School of Medicine, China Medical University, Taichung 404, Taiwan; (C.-T.H.); (Y.-T.Y.)
- Integrative Stem Cell Center, Department of Orthopaedics, China Medical University Hospital, Taichung 404, Taiwan
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12
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Abd Elmaksoud MS, Gomaa NS, Azouz HG, On CNV, Ho CT, Omar TE, McGrath JA, Onoufriadis A. Genetic analysis in three Egyptian patients with Griscelli syndrome Type 1 reveals new nonsense mutations in MYO5A. Clin Exp Dermatol 2020; 45:789-792. [PMID: 32275080 DOI: 10.1111/ced.14220] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/21/2020] [Indexed: 10/24/2022]
Affiliation(s)
- M S Abd Elmaksoud
- Department of Pediatrics, Pediatric Neurology Unit, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - N S Gomaa
- Dermatology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
| | - H G Azouz
- Department of Pediatrics, Pediatric Neurology Unit, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - C N V On
- St John's Institute of Dermatology, School of Basic and Medical Biosciences, King's College London, London, UK
| | - C T Ho
- St John's Institute of Dermatology, School of Basic and Medical Biosciences, King's College London, London, UK
| | - T E Omar
- Department of Pediatrics, Pediatric Neurology Unit, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - J A McGrath
- St John's Institute of Dermatology, School of Basic and Medical Biosciences, King's College London, London, UK
| | - A Onoufriadis
- St John's Institute of Dermatology, School of Basic and Medical Biosciences, King's College London, London, UK
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13
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Eisele TA, Adadevoh K, Anderson G, Brause A, Briesmeister D, Burke J, Cherix G, Ellis C, Hendricks S, Ho CT, Huang CJ, Iuliano T, Kline L, Knapp C, Krueger D, Terwel L. Determination of D-Malic Acid in Apple Juice by Liquid Chromatography: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/79.1.50] [Citation(s) in RCA: 4] [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: 11/13/2022]
Abstract
Abstract
Eleven laboratories collaboratively studied a liquid chromatographic (LC) method for determination of D-malic acid in apple juice. The mobile phase consisted of 16 mM L-valine and 8 mM copper acetate adjusted to pH 5.5 with NaOH. The UV detector was set at 330 nm, and a single reversed-phase LC column was used. Seven paired samples containing various amounts of D-malic acid ranging from 0 to 188 mg/100 mL of 12 Brix pasteurized apple juice were tested by each collaborator. Repeatability and reproducibility coefficients of variation ranged from 1.0 to 3.5% and 7.7 to 11.7%, respectively, within the range of 26 to 188 mg D-malic acid/100 mL of 12 Brix apple juice. The collabora tive study results demonstrated that the method could quantitate the economic adulteration of ap ple juice with DL-malic acid at lower levels than those reported with previous methods. The LC method for determination of D-malic acid in apple juice has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
- Thomas A Eisele
- Tree Top, Inc., Technical Center, PO Box 248, Selah, WA 98942
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Lai KG, Chen CF, Ho CT, Liu JJ, Liu TZ, Chern CL. Novel roles of folic acid as redox regulator: Modulation of reactive oxygen species sinker protein expression and maintenance of mitochondrial redox homeostasis on hepatocellular carcinoma. Tumour Biol 2017. [DOI: 10.1177/1010428317702649] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Kun-Goung Lai
- Department of Radiation Oncology, Tungs’ Taichung Metroharbor Hospital, Taichung, Taiwan
| | - Chi-Fen Chen
- Clinical Laboratories, Yuan’s General Hospital, Kaohsiung, Taiwan
- Department of Medical Laboratory and Biotechnology Science, Kaohsiung Medical University, Kaohsiung, Taiwan
- Shu-Zen Junior College of Medicine and Management, Kaohsiung, Taiwan
| | - Chun-Te Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Jun-Jen Liu
- School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan
| | - Tsan-Zon Liu
- Translational Research Laboratory, Cancer Center, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chi-Liang Chern
- Department of Medical Laboratory Science and Biotechnology, Fooyin University, Kaohsiung, Taiwan
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Kuo JR, Shang HS, Ho CT, Lai KG, Liu TZ, Chen YJ, Chiou JF. Cisplatin-induced regulation of signal transduction pathways and transcription factors in p53-mutated subclone variants of hepatoma cells: Potential application for therapeutic targeting. Oncol Lett 2016; 12:3723-3730. [PMID: 27895723 PMCID: PMC5104157 DOI: 10.3892/ol.2016.5181] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 08/09/2016] [Indexed: 01/23/2023] Open
Abstract
Cisplatin is commonly recognized as a DNA-damaging drug; however, its versatile antitumor effects have been demonstrated to extend beyond this narrow functional attribute. The present study determined how cisplatin regulates alternative pathways and transcription factors to exert its additional antitumor actions. Cisplatin was observed to be able to trigger an endoplasmic reticulum stress response through aggravated nitrosative stress coupled to perturbed mitochondrial calcium (Ca2+) homeostasis, which substantially downregulated glucose-regulated protein (GRP) 78 expression by suppressing the cleavage of activating transcription factor (ATF) 6α (90 kDa) to its active 50 kDa subunit. Concomitantly, the ATF4-ATF3-C/emopamil binding protein homologous protein axis was activated by cisplatin, which triggered cellular glutathione (GSH) depletion by strongly inhibiting γ-glutamylcysteine synthetase heavy chain (γ-GCSh), a key enzyme in GSH biosynthesis. The present study also demonstrated that cisplatin substantially inhibited β-catenin, causing a marked downregulation of survivin and B-cell lymphoma (Bcl)-2. Taken together, the present results uncovered a novel mechanism of cisplatin that could simultaneously trigger the inhibition of three prominent antiapoptotic effector molecules (Bcl-2, survivin and GRP78) and effectively promote GSH depletion by inhibiting γ-GCSh. These newly discovered functional attributes of cisplatin can provide an avenue for novel combined therapeutic strategies to kill hepatocellular carcinoma cells effectively.
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Affiliation(s)
- Jinn-Rung Kuo
- Department of Neurosurgery, Chi-Mei Medical Center, Tainan 71004, Taiwan, R.O.C.; Department of Medical Research, Chi-Mei Medical Center, Tainan 71004, Taiwan, R.O.C
| | - Hung-Sheng Shang
- Division of Clinical Pathology, Department of Pathology, National Defense Medical Center, Tri-Service General Hospital, Taipei 11490, Taiwan, R.O.C
| | - Chun-Te Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan, R.O.C
| | - Kun-Goung Lai
- Department of Radiation Oncology, Tungs' Taichung Metro Harbor Hospital, Taichung 43503, Taiwan, R.O.C
| | - Tsan-Zon Liu
- Translational Research Laboratory, Cancer Center, Taipei Medical University, Taipei 11031, Taiwan, R.O.C
| | - Yin-Ju Chen
- Department of Radiation Oncology, Taipei Medical University Hospital, Taipei 11031, Taiwan, R.O.C.; Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan, R.O.C.; Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 11031, Taiwan, R.O.C
| | - Jeng-Fong Chiou
- Department of Radiation Oncology, Taipei Medical University Hospital, Taipei 11031, Taiwan, R.O.C.; Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan, R.O.C
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Ho CT, Shang HS, Chang JB, Liu JJ, Liu TZ. Folate deficiency-triggered redox pathways confer drug resistance in hepatocellular carcinoma. Oncotarget 2016; 6:26104-18. [PMID: 26327128 PMCID: PMC4694889 DOI: 10.18632/oncotarget.4422] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Accepted: 06/17/2015] [Indexed: 02/07/2023] Open
Abstract
Patients with hepatocellular carcinoma (HCC) are prone to folate deficiency (FD). Here we showed that, in cell line-specific manner, FD caused resistance to FD-induced oxidative stress and multi-drug resistance (MDR). This resistance was due to upregulation of glucose-regulated protein 78 (GRP78) and Survivin. Using siRNA and Epigallocatechin gallate (EGCG), we found that GRP78 and Survivin cooperatively conferred MDR by decreasing FD-induced ROS generation. Our data showed that FD increases GRP78 and Survivin, which serve as ROS inhibitors, causing MDR in HCC. We suggest that folate supplementation may enhance the efficacy of chemotherapy.
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Affiliation(s)
- Chun-Te Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Hung-Sheng Shang
- Department of Pathology, National Defense Medical Center, Division of Clinical Pathology, Tri-Service General Hospital, Taipei, Taiwan
| | - Jin-Biou Chang
- Department of Pathology, National Defense Medical Center, Division of Clinical Pathology, Tri-Service General Hospital, Taipei, Taiwan
| | - Jun-Jen Liu
- School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan
| | - Tsan-Zon Liu
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
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Wang RC, Huang CY, Pan TL, Chen WY, Ho CT, Liu TZ, Chang YJ. Proteomic Characterization of Annexin l (ANX1) and Heat Shock Protein 27 (HSP27) as Biomarkers for Invasive Hepatocellular Carcinoma Cells. PLoS One 2015; 10:e0139232. [PMID: 26431426 PMCID: PMC4592234 DOI: 10.1371/journal.pone.0139232] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [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: 03/19/2015] [Accepted: 09/10/2015] [Indexed: 02/07/2023] Open
Abstract
To search for reliable biomarkers and drug targets for management of hepatocellular carcinoma (HCC), we performed a global proteomic analysis of a pair of HCC cell lines with distinct differentiation statuses using 2-DE coupled with MALDI-TOF MS. In total, 106 and 55 proteins were successfully identified from the total cell lysate and the cytosolic, nuclear and membrane fractions in well-differentiated (HepG2) and poorly differentiated (SK-Hep–1) HCC clonal variants, respectively. Among these proteins, nine spots corresponding to proteins differentially expressed between HCC cell types were selected and confirmed by immunofluorescence staining and western blotting. Notably, Annexin 1 (ANX1), ANX–2, vimentin and stress-associated proteins, such as GRP78, HSP75, HSC–70, protein disulfide isomerase (PDI), and heat shock protein–27 (HSP27), were exclusively up-regulated in SK-Hep–1 cells. Elevated levels of ANX–4 and antioxidant/metabolic enzymes, such as MnSOD, peroxiredoxin, NADP-dependent isocitrate dehydrogenase, α-enolase and UDP-glucose dehydrogenase, were observed in HepG2 cells. We functionally demonstrated that ANX1 and HSP27 were abundantly overexpressed only in highly invasive types of HCC cells, such as Mahlavu and SK-Hep–1. Knockdown of ANX1 or HSP27 in HCC cells resulted in a severe reduction in cell migration. The in-vitro observations of ANX1 and HSP27 expressions in HCC sample was demonstrated by immunohistochemical stains performed on HCC tissue microarrays. Poorly differentiated HCC tended to have stronger ANX1 and HSP27 expressions than well-differentiated or moderately differentiated HCC. Collectively, our findings suggest that ANX1 and HSP27 are two novel biomarkers for predicting invasive HCC phenotypes and could serve as potential treatment targets.
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Affiliation(s)
- Ruo-Chiau Wang
- Tissue Bank, Chang Gung Memorial Hospital, Chiayi, Taiwan
| | - Chien-Yu Huang
- Division of General Surgery, Department of Surgery, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan; Department of Neurosurgery, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
| | - Tai-Long Pan
- School of Traditional Chinese Medicine, Chang Gung University, Taoyuan, Taiwan; Research Center for Industry of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, Taiwan; Liver Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Wei-Yu Chen
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan; Department of Pathology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan; Department of Pathology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Chun-Te Ho
- Graduate Institute of Medical Science, Taipei Medical University, Taipei, Taiwan
| | - Tsan-Zon Liu
- Translational Research Laboratory, Cancer Center, Taipei Medical University Hospital, Taipei, Taiwan
| | - Yu-Jia Chang
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan; Translational Research Laboratory, Cancer Center, Taipei Medical University Hospital, Taipei, Taiwan; Division of General Surgery, Department of Surgery, Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan; Cancer Research Center, Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan
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18
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Ho CT, Chang YJ, Yang LX, Wei PL, Liu TZ, Liu JJ. A Novel Microtubule-Disrupting Agent Induces Endoplasmic Reticular Stress-Mediated Cell Death in Human Hepatocellular Carcinoma Cells. PLoS One 2015; 10:e0136340. [PMID: 26355599 PMCID: PMC4565632 DOI: 10.1371/journal.pone.0136340] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 07/31/2015] [Indexed: 01/27/2023] Open
Abstract
Here, we present evidence of a novel microtubule-disrupting agent, N-deacetyl-N-(chromone-2-carbonyl)-thiocolchicine (TCD), exhibiting potent antitumor activity (with IC50 values in the nanomolar range) against hepatocellular carcinoma cell lines. Cell cycle analysis revealed that TCD induced G2/M cell-cycle arrest in a dose- and time-dependent manner in both Hep-J5 and Mahlavu HCC cell lines. TCD also induced a decrease in mitochondrial membrane potential (ΔΨm) and caused DNA damage. Mechanistically, TCD activated protein kinase RNA-like endoplasmic reticular kinase and several transcription factors, including activating transcription factor (ATF) 6, ATF4, ATF3, and the CCAAT-enhancer binding protein homologous protein. These data clearly demonstrate that the antitumor activity of TCD is mechanistically linked to its capacity to trigger both intrinsic and extrinsic apoptotic cell death via endoplasmic reticular stress pathway. The potent antitumor activity of TCD was similarly demonstrated in a hepatocellular carcinoma xenograft model, where 5 and 10 mg/kg doses of TCD significantly arrested Hep-J5 and Mahlavu tumor growth. Our finding suggests that TCD is a promising therapeutic agent against hepatocellular carcinoma; further translational assessment of its clinical usage is warranted.
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Affiliation(s)
- Chun-Te Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan; School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan
| | - Yu-Jia Chang
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan; Department of Surgery, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Li-Xi Yang
- Radiobiology Laboratory, California Pacific Medical Center Research Institute, San Francisco, CA, United States of America; St. Mary's Medical Center, San Francisco, CA, United States of America
| | - Po-Li Wei
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan; Department of Surgery, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Tsan-Zon Liu
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Jun-Jen Liu
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan; School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan
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Abstract
Tunable band gaps of Co3−xCuxO4 nanorods were synthesized with a solution process and first reported in this study.
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Affiliation(s)
- Chun-Te Ho
- Department of Materials Science and Engineering
- National Tsing-Hua University
- Hsinchu, Taiwan 30013
| | - Tsu-Heng Weng
- Department of Materials Science and Engineering
- National Tsing-Hua University
- Hsinchu, Taiwan 30013
| | - Chiu-Yen Wang
- Department of Materials Science and Engineering
- National Tsing-Hua University
- Hsinchu, Taiwan 30013
| | - Shiang-Jie Yen
- Department of Materials Science and Engineering
- National Tsing-Hua University
- Hsinchu, Taiwan 30013
| | - Tri-Rung Yew
- Department of Materials Science and Engineering
- National Tsing-Hua University
- Hsinchu, Taiwan 30013
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Hsu HC, Chiou JF, Wang YH, Chen CH, Mau SY, Ho CT, Chang PJ, Liu TZ, Chen CH. Folate deficiency triggers an oxidative-nitrosative stress-mediated apoptotic cell death and impedes insulin biosynthesis in RINm5F pancreatic islet β-cells: relevant to the pathogenesis of diabetes. PLoS One 2013; 8:e77931. [PMID: 24223745 PMCID: PMC3817167 DOI: 10.1371/journal.pone.0077931] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [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: 04/02/2013] [Accepted: 09/06/2013] [Indexed: 12/19/2022] Open
Abstract
It has been postulated that folic acid (folate) deficiency (FD) may be a risk factor for the pathogenesis of a variety of oxidative stress-triggered chronic degenerative diseases including diabetes, however, the direct evidence to lend support to this hypothesis is scanty. For this reason, we set out to study if FD can trigger the apoptotic events in an insulin-producing pancreatic RINm5F islet β cells. When these cells were cultivated under FD condition, a time-dependent growth impediment was observed and the demise of these cells was demonstrated to be apoptotic in nature proceeding through a mitochondria-dependent pathway. In addition to evoke oxidative stress, FD condition could also trigger nitrosative stress through a NF-κB-dependent iNOS-mediated overproduction of nitric oxide (NO). The latter compound could then trigger depletion of endoplasmic reticulum (ER) calcium (Ca2+) store leading to cytosolic Ca2+ overload and caused ER stress as evidence by the activation of CHOP expression. Furthermore, FD-induced apoptosis of RINm5F cells was found to be correlated with a time-dependent depletion of intracellular gluthathione (GSH) and a severe down-regulation of Bcl-2 expression. Along the same vein, we also demonstrated that FD could severely impede RINm5F cells to synthesize insulin and their abilities to secret insulin in response to glucose stimulation were appreciably hampered. Even more importantly, we found that folate replenishment could not restore the ability of RINm5F cells to resynthesize insulin. Taken together, our data provide strong evidence to support the hypothesis that FD is a legitimate risk factor for the pathogenesis of diabetes.
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Affiliation(s)
- Hung-Chih Hsu
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Physical Medicine and Rehabilitation, Chia-Yi Chang Gung Memorial Hospital, Chia-Yi, Taiwan
- Department of Nursing, Chang-Gung University of Science and Technology, Chia-Yi, Taiwan
| | - Jeng-Fong Chiou
- Cancer Center and Department of Radiation Oncology, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Yu-Huei Wang
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Chia-Hui Chen
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Shin-Yi Mau
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Chun-Te Ho
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Pey-Jium Chang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Tsan-Zon Liu
- Translational Research Laboratory, Cancer Center, Taipei Medical University and Hospital, Taipei, Taiwan
- * E-mail: (TZL); (CHC)
| | - Ching-Hsein Chen
- Department of Microbiology, Immunology and Biopharmaceuticals, Collage of Life Sciences, National Chiayi University, Chiayi City, Taiwan
- * E-mail: (TZL); (CHC)
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Ho CT, Liu TZ, Chou YT, Hsiao SH, Liu JJ. Abstract 4970: Folate metabolism defect induce invasion and Gefinitib resistance in lung cancer. Cancer Res 2013. [DOI: 10.1158/1538-7445.am2013-4970] [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: 11/16/2022]
Abstract
Abstract
Folate, act as an one-carbon units donator or acceptor, participate in numerous biochemical reactions. Because mammals can't synthesize folic acid de novo, obtain from diet or from microbial breakdown in the gut is essential. Pathological study revealed that tumor cell expressing high level of folate receptors (FR) comparing to normal tissue. Therefore, exploring the application of folate-related physiological properties as an anticancer strategy arose worldwide interesting. Previous studies in lung cancer revealed a positive correlation in folate receptors overexpression and efficacy of antifolate chemotherapy. Here we describe prolong Alimta treatment would prompt lung cancer cell's malignancy. Cultivation of lung cancer CL1-0, CL1-5, and A549 in low dose Alimta (15-30 ng/mL) for 2-3 weeks would dramatically cause cell morphology change . Compare to control cell with round and flat epithelial like morphology, low dose Alimta treated cells showed mesenchymal to amoeboid phenotype. Further examination of epithelial to mesenchymal transition (EMT) markers showed the expression level of N-cadherin, matrix metalloproteinase 1 (MMP-1) and matrix metalloproteinase 2 (MMP-2) increased. Associated with morphology and EMT marker changed, cell migration and invasion ability of those Alimta treated cells were 3 folds higher than control cells. Besides, evaluated drug sensitivity by sulforhodamine B (SRB) method showed that those alimta treated cells were more resistant to gefitinib. These prominent events provoked our interesting to investigate the mechanism involving in the oncogenic effect induced by low dose Alimta treatment. While examing EMT-related transcription factors, both Slug and SOX-9 expression increased significantly. These evidences indicated that the folate metabolism defect induced metastasis could through the SOX-9 and Slug mechanism.
Citation Format: Chun-Te Ho, Tsan-Zon Liu, Yu-Ting Chou, Shih-Hsin Hsiao, Jun-Jen Liu. Folate metabolism defect induce invasion and Gefinitib resistance in lung cancer. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 4970. doi:10.1158/1538-7445.AM2013-4970
Note: This abstract was not presented at the AACR Annual Meeting 2013 because the presenter was unable to attend.
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Affiliation(s)
- Chun-Te Ho
- 1School of Medical Laboratory Science and Biotechnology, Taipei Medical Univ., Taipei, Taiwan
| | | | - Yu-Ting Chou
- 3Department of Life Science, National Tsing Hua University, Taiwan
| | - Shih-Hsin Hsiao
- 4Department of Pulmonary, Taipei Medical University and Hospital, Taipei, Taiwan
| | - Jun-Jen Liu
- 1School of Medical Laboratory Science and Biotechnology, Taipei Medical Univ., Taipei, Taiwan
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Wu CH, Uen YH, Ho CT, Tseng YT, Liu TZ, Chiou JF, Leung SW. Constitutive Overexpression of Bcl-2, Survivin and ER Stress Chaperone GRP-78 Confers Intrinsic Radioresistance in Human Hepatocellular Carcinoma Cells: Insight into the Mechanistic Pathways Involved. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jct.2013.42a048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Tipoe GL, Ho CT, Liong EC, Leung TM, Lau TYH, Fung ML, Nanji AA. Voluntary oral feeding of rats not requiring a very high fat diet is a clinically relevant animal model of non-alcoholic fatty liver disease (NAFLD). Histol Histopathol 2009; 24:1161-9. [PMID: 19609863 DOI: 10.14670/hh-24.1161] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Animal models used to study the pathogenesis of non-alcoholic fatty liver disease (NAFLD) are, in general, either genetically altered, or fed with a diet that is extremely high in fat or carbohydrates. Recent findings support the role of oxidative stress, lipid peroxidation and inflammation as probable causative factors. We hypothesize that not only the amount of dietary fat, but the quality of fat is also important in inducing NAFLD. Based on previous observations that female rats fed a diet comprising unsaturated fatty acids are susceptible to liver injury, we proposed that female rats fed with a diet containing fish oil and dextrose would develop pathological and biochemical features of NAFLD. We fed a highly unsaturated fat diet (30% fish oil) to female Sprague-Dawley rats (180-200g), consumed ad libitum for 8 weeks (NAFLD; n=6-8 ). Control animals (CF; n=6-8) were fed with an isocaloric regular rat chow. At killing, blood and liver samples were collected for serum alanine aminotransferase (ALT), histology and molecular analysis. Each histological sample was evaluated for fatty liver (graded from 0 to 4+ according to the amount of fatty change), necrosis (number of necrotic foci (no./mm2) and inflammation (cells per mm2). The amount of collagen formation was estimated based on the amount of Sirius Red staining. Reverse transcriptase polymerase chain reaction (RT-PCR) was carried out for tumor necrosis factor alpha (TNF-alpha), cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), adiponectin, glutathione peroxidase (GPx), superoxide dismutase (Cu/Zn SOD) and catalase (CAT). Western Blot analysis was done for cyclooxygenases-2 (COX-2), inducible nitric oxide synthase (iNOS) and nitrotyrosine. Electrophoretic mobility shift assay was performed for nuclear factor-kappa B (NF-kB) activity. NAFLD rats had a significantly higher serum ALT level, amount of collagen formation, fatty liver, necrosis and inflammation when compared with the chow-fed control rats. mRNA and protein levels of NF-kB regulated genes, which included TNF-alpha, COX-2 and iNOS were also significantly (p<0.01; p<0.01; p<0.05 respectively) upregulated in the NAFLD group when compared with the chow-fed control rats. mRNA levels of antioxidants CAT and GPX were reduced by 35% and 50% respectively in the NAFLD group. However, Cu/Zn SOD mRNA was similar in both groups. The mRNA level of adiponectin was also reduced in NAFLD group. NF-kB activity was markedly increased in the NAFLD rats (p<0.01). The level of oxidative stress, represented by the formation of nitrotyrosine, was significantly elevated in the NAFLD rats (p<0.01). We conclude that NAFLD rats demonstrated several features of NAFLD, which included fatty liver, inflammation, necrosis, increased oxidative stress, an imbalance between pro and antioxidant enzymes mRNAs, reduced adiponectin levels and upregulation of pro-inflammatory mediators. We propose that female rats fed with a diet containing highly unsaturated fatty acids are an extremely useful model for the study of NAFLD.
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Affiliation(s)
- G L Tipoe
- Department of Anatomy, The University of Hong Kong, Hong Kong, SAR, China.
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Huang YP, Wang JS, Huang KN, Ho CT, Huang JD, Young MS. Envelope pulsed ultrasonic distance measurement system based upon amplitude modulation and phase modulation. Rev Sci Instrum 2007; 78:065103. [PMID: 17614634 DOI: 10.1063/1.2745238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A novel microcomputer-based ultrasonic distance measurement system is presented. This study proposes an efficient algorithm which combines both the amplitude modulation (AM) and the phase modulation (PM) of the pulse-echo technique. The proposed system can reduce error caused by inertia delay and amplitude attenuation effect when using the AM and PM envelope square wave form (APESW). The APESW ultrasonic driving wave form causes a phase inversion phenomenon in the relative wave form of the receiver. The phase inversion phenomenon sufficiently identifies the "measurement pulse" in the received wave forms, which can be used for accurate time-of-flight (TOF) measurement. In addition, combining a countertechnique to compute the phase shifts of the last cycle for TOF, the presented system can obtain distance resolution of 0.1% of the wavelength corresponding to the 40 kHz frequency of the ultrasonic wave. The standard uncertainty of the proposed distance measurement system is found to be 0.2 mm at a range of 50-500 mm. The APESW signal generator and phase detector of this measuring system are designed on a complex programmable logic device, which is used to govern the TOF measurement and send the data to a personal computer for distance calibration and examination. The main advantages of this APESW system are high resolution, low cost, narrow bandwidth requirement, and ease of implementation.
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Affiliation(s)
- Y P Huang
- Department of Electrical Engineering, National Cheng-Kung University, Tainan, 701 Taiwan, Republic of China
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Charlier-Bret N, Boucher B, Poyart C, Quesne G, Bingen E, Doit C, Ho CT, Deschênes M, Maisonneuve P. [Rapid antigen detection tests for diagnosis of group A streptococcal pharyngitis: comparative evaluation of sensitivity and practicability of 16 in vitro diagnostics medical devices performed in July 2002 by the French health products safety agency (Afssaps) as part of its market control mission]. ACTA ACUST UNITED AC 2004; 52:438-43. [PMID: 15465261 DOI: 10.1016/j.patbio.2004.07.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2004] [Accepted: 07/07/2004] [Indexed: 11/15/2022]
Abstract
Within the scope of its health products control mission, the French Health Products Safety Agency (Afssaps) collaborating with two expert's sites, has assessed the 16 tests available on the French market in 2002 for rapid diagnosis of the Streptococcus A tonsillitis. The purpose of this study was to verify the reliability and rapidity of these tests and to give some information to the users about their analytical criteria and practicability characteristics. The analytical study has been performed on a same panel of four reference strains of Streptococcus pyogenes dilutions to determine the limit of detection of all the reagents in the same condition of methodology. The limit of detection has been calculated with the results expressed in colony forming unit by ml (CFU/ml). The practicability study has permitted to analyze the quality of the presentation, the easiness of the final reading and of performing tests. A score has been established for each rapid test. A classification of the analytical sensitivity (limit of detection) and practicability (score) of these 16 devices has been established. The limit of detection of the reagents giving the best results allows the detection of the lowest bacterial concentration of the panel which is 10(5) CFU/ml. Regarding practicability, the results suggest that, the immunochromatographic strip methods have the best score in a view with the use by a non medical laboratory.
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Affiliation(s)
- N Charlier-Bret
- Agence française de sécurité sanitaire des produits de santé (Afssaps)/DEDIM/ UECM-DIV (Unité évaluation et contrôle du marché - Diagnostic in vitro), 93000 Saint-Denis, France.
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26
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Huang HH, Ho CT, Lee TH, Lee TL, Liao KK, Chen FL. Effect of surface roughness of ground titanium on initial cell adhesion. ACTA ACUST UNITED AC 2004; 21:93-7. [PMID: 15567102 DOI: 10.1016/j.bioeng.2004.05.001] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2003] [Revised: 05/12/2004] [Accepted: 05/20/2004] [Indexed: 10/26/2022]
Abstract
The effect of surface roughness of ground Ti on the initial adhesion of osteoblast-like U-2 OS cells was investigated in this study. Different numbers (#120, #600, and #1500) of SiC sandpaper and two Al2O3 polishing powder (0.3 and 1 microm) were used to prepare the metal specimens with varying degrees of surface roughness. Surface roughness (Ra) was measured by profilometry. Surface topography was observed using an atomic force microscope. MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide) assay was used to measure the optical density (OD) of specimens after 2 h of cell incubation. The OD value was analyzed by one-way ANOVA for analyzing the factor of surface roughness. Crystal violet staining technique was used to characterize the cell spreading. Results showed that the specimen of #1500 Ti (Ra: 0.15 microm) had the highest OD value. The specimens polished with 0.3 and 1 microm Al2O3 powder (Ra: 0.05 and 0.07 microm) exhibited the worst cell adhesion behavior. Contact guidance of cells could be observed on the rougher #600 and #120 specimens (Ra: 0.33 and 1.20 microm). This study concludes that the surface roughness (Ra: 0.05-1.20 microm) of ground Ti has a highly significant influence on the initial adhesion of osteoblast-like U-2 OS cells. The ground Ti with an Ra of 0.15 microm shows the optimal cell adhesion behavior with respect to either the rougher or smoother specimens.
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Affiliation(s)
- Her-Hsiung Huang
- Institute of Oral Materials Science, Chung Shan Medical University, No. 110, Sec.1, Chien-Kuo North Road, Taichung 402, Taiwan.
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27
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Ho CT, Lau TYH, Jin Y, Lu HB, Liong E, Leung KM, Tipoe GL. Overexpression of iNOS and down-regulation of BMPs-2, 4 and 7 in retinoic acid induced cleft palate formation. Histol Histopathol 2004; 19:95-104. [PMID: 14702176 DOI: 10.14670/hh-19.95] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The present work studied the induction of cleft palate formation in embryos developed from pregnant BALB/c mice treated orally with retinoic acid (RA). Previous studies on mature somatic cell types showed that RA exerted inhibitory effects on inducible nitric oxide synthase (iNOS) production. For the first time, our study has shown that RA actually stimulates significant expression of iNOS at specific zones of the affected embryonic palatal tissues at three consecutive stages, from gestation day 13 (GD13) to day 16 (GD16). Enzymatically, iNOS facilitates intracellular nitric oxide (NO) synthesis from L-arginine. When NO reacts with reactive superoxides it may result in irreparable cell injury. NO was also reported to induce apoptosis in some mammalian cell systems. Based on our findings, we propose that such an increase in NO production might be associated with apoptosis in the embryonic palatal tissues in the RA-treated mice. The detrimental effects of NO resulted in a reduction in proliferating palatal cells and therefore disturbed the normal plasticity of the palatal shelves. With iNOS overexpression, our findings also showed that there was significant concomitant down-regulation in the expressions of Bone Morphogenetic Proteins (BMPs) -2, 4, and 7 with regional variations particularly in the palatal mesenchymal cells for those embryos developing cleft palate. Since specific spatial and temporal expressions of BMPs -2, 4, and 7 are critical during normal palatal morphogenesis, any deficiency in the epithelial-mesenchymal interaction may result in retarding growth at the embryonic palatal shelves. Taken together, our study has demonstrated cleft palate formation in the BALB/c embryos involved overexpression of iNOS and down-regulation of BMPs-2, 4 and 7.
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Affiliation(s)
- C T Ho
- Department of Anatomy, Faculty of Medicine, The University of Hong Kong, Hong Kong, S.A.R., P.R. China
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28
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Jhoo JW, Sang S, He K, Cheng X, Zhu N, Stark RE, Zheng QY, Rosen RT, Ho CT. Characterization of the triterpene saponins of the roots and rhizomes of blue cohosh (Caulophyllum thalictroides). J Agric Food Chem 2001; 49:5969-5974. [PMID: 11743794 DOI: 10.1021/jf010814e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Seven triterpene saponins were isolated from n-butanol fractions of blue cohosh (Caulophyllum thalictroides) roots and rhizomes. Their structures were established by spectral ((1)H NMR, (13)C NMR, 2D-NMR, and APCI-MS) techniques and chemical reactions as hederagenin 3-O-alpha-L-arabinopyranoside (1); caulophyllogenin 3-O-alpha-L-arabinopyranoside (2); hederagenin 3-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-arabinopyranoside (3); 3-O-alpha-L-arabinopyranosyl-hederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (4); 3-O-alpha-L-arabinopyranosyl- caulophyllogenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (5); 3-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-arabinopyranosyl- echinocystic acid 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (6); 3-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-arabinopyranosyl-hederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (7). All seven compounds were identified in this species for the first time.
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Affiliation(s)
- J W Jhoo
- Department of Food Science and Center for Advanced Food Technology, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey, 08901, USA
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29
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Zhu N, Kikuzaki H, Sheng S, Sang S, Rafi MM, Wang M, Nakatani N, DiPaola RS, Rosen RT, Ho CT. Furanosesquiterpenoids of Commiphora myrrha. J Nat Prod 2001; 64:1460-1462. [PMID: 11720534 DOI: 10.1021/np010072j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An investigation on the gum exudates of Commiphora myrrha has led to the isolation of six sesquiterpenoids. On the basis of spectroscopic data interpretation, they were determined as two new furanosesquiterpenoids, rel-1S,2S-epoxy-4R-furanogermacr-10(15)-en-6-one (1) and rel-2R-methyl-5S-acetoxy-4R-furanogermacr-1(10)Z-en-6-one (2), and four known furanosesquiterpenoids, rel-3R-methoxy-4S-furanogermacra-1E,10(15)-dien-6-one (3), rel-2R-methoxy-4R-furanogermacr-1(10)E-en-6-one (4), furanogermacra-1(10)Z,4Z-dien-6-one, and curzerenone [6,7-dihydro-5beta-isopropenyl-3,6beta-dimethyl-6-vinylbenzofuran-4(5H)-one]. This is the first report of the relative stereochemistry for the known compounds 3 and 4. Compound 1 exhibited weak cytotoxic activity against a MCF-7 breast tumor cell line in a clonogenic assay, while the other five compounds were inactive in this assay.
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MESH Headings
- Antineoplastic Agents, Phytogenic/chemistry
- Antineoplastic Agents, Phytogenic/isolation & purification
- Antineoplastic Agents, Phytogenic/pharmacology
- Breast Neoplasms
- Burseraceae/chemistry
- Chromatography, Thin Layer
- Drugs, Chinese Herbal/chemistry
- Drugs, Chinese Herbal/isolation & purification
- Drugs, Chinese Herbal/pharmacology
- Female
- Humans
- Molecular Conformation
- Molecular Structure
- Nuclear Magnetic Resonance, Biomolecular
- Plants, Medicinal/chemistry
- Sesquiterpenes/chemistry
- Sesquiterpenes/isolation & purification
- Sesquiterpenes/pharmacology
- Sesquiterpenes, Germacrane
- Stereoisomerism
- Tumor Cells, Cultured/drug effects
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Affiliation(s)
- N Zhu
- Department of Food Science, Rutgers University, New Brunswick, New Jersey 08901, USA
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30
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Hong J, Smith TJ, Ho CT, August DA, Yang CS. Effects of purified green and black tea polyphenols on cyclooxygenase- and lipoxygenase-dependent metabolism of arachidonic acid in human colon mucosa and colon tumor tissues. Biochem Pharmacol 2001; 62:1175-83. [PMID: 11705450 DOI: 10.1016/s0006-2952(01)00767-5] [Citation(s) in RCA: 192] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The effects of green and black tea polyphenols on cyclooxygenase (COX)- and lipoxygenase (LOX)-dependent arachidonic acid metabolism in normal human colon mucosa and colon cancers were investigated. At a concentration of 30 microg/mL, (-)-epigallocatechin-3-gallate (EGCG), (-)-epigallocatechin (EGC), and (-)-epicatechin-3-gallate (ECG) from green tea and theaflavins from black tea inhibited LOX-dependent activity by 30-75%. The formation of 5-, 12-, and 15-LOX metabolites was inhibited to a similar extent. Tea polyphenols also inhibited COX-dependent arachidonic acid metabolism in microsomes from normal colon mucosa, with ECG showing the strongest inhibition. The formation of thromboxane (TBX) and 12-hydroxyheptadecatrienoic acid (HHT) was decreased to a greater extent than other metabolites. The inhibitory effects of tea polyphenols on COX activity, however, were less pronounced in tumor microsomes than in normal colon mucosal microsomes. Theaflavins strongly inhibited the formation of TBX and HHT, but increased the production of prostaglandin E(2) (PGE(2)) in tumor microsomes. The enhancing effect of theaflavins on PGE(2) production was related to the COX-2 level in the microsomes. Although theaflavin inhibited ovine COX-2, its activity in the formation of PGE(2) was stimulated by theaflavin when ovine COX-2 was mixed with microsomes, suggesting that theaflavin affects the interaction of COX-2 with other microsomal factors (e.g. PGE synthase). The present results indicate that tea polyphenols can affect arachidonic acid metabolism in human colon mucosa and colon tumors, and this action may alter the risk for colon cancer in humans.
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Affiliation(s)
- J Hong
- Laboratory for Cancer Research, College of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854-8020, USA
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Abstract
Three new spirostanol saponins have been isolated from the seeds of Allium tuberosum. On the basis of acid hydrolysis and comprehensive spectroscopic analysis, their structures were established as tuberoside J, (25R)-5alpha-spirostan-2alpha,3beta,27-triol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranoside; tuberoside K, (25R)-5alpha-spirostan-2alpha,3beta,27-triol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside; and tuberoside L, 27-O-beta-D-glucopyranosyl-(25R)-5alpha-spirostan-2alpha,3beta,27-triol 3-O-alpha-D-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside.
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Affiliation(s)
- S Sang
- Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, People's Republic of China
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32
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Sang S, Cheng X, Zhu N, Stark RE, Badmaev V, Ghai G, Rosen RT, Ho CT. Flavonol glycosides and novel iridoid glycoside from the leaves of Morinda citrifolia. J Agric Food Chem 2001; 49:4478-4481. [PMID: 11559157 DOI: 10.1021/jf010492e] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
One new iridoid glycoside and five known flavonol glycosides have been isolated from the leaves of Morinda citrifolia. The new iridoid exists as an epimeric mixture in solution. Complete assignments of the proton and carbon chemical shifts for the individual epimers were accomplished on the basis of high-resolution 1D and 2D NMR data. Their antioxidative activities were measured. All of these compounds showed DPPH free radical scavenging activity at the concentration of 30 microM.
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Affiliation(s)
- S Sang
- Department of Food Science and Center for Advanced Food Technology, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, USA
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33
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Abstract
Expression of the yeast Delta9 desaturase gene in tomato (Lycopersicon esculentum Mill.) resulted in changes in the profiles of fatty acids in tomato leaves. Transgenic leaves displayed a dramatic increase in cis-Delta9 16:1, which only existed in a small quantity in control leaves. Also higher, but not as dramatic, were 18:1 and 16:3 fatty acids. Several fatty acids, viz. 16:0, 18:0, and 18:3 declined in transgenic leaves. Changes in fatty acids were accompanied by changes in certain volatile compounds derived from fatty acids. On a percentage basis, most notable increases (>3-fold) were 1-hydroxy-2-butanone, 1-penten-3-ol, heptanal, 3-hexen-1-ol, 2-octanol,cis-3-hexenal, hexanal and 2-nonenal. Several flavor compounds not known to be biochemically derived from fatty acids, viz. 2-ethyl-furan, 5-ethyl-2-[5H]-furanone, eugenol, and 2-ethylthiophene also showed sharp increases in transgenic leaves.
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Affiliation(s)
- C Wang
- Department of Plant Science, Rutgers, The State University of New Jersey, 59 Dudley Road, New Brunswick, NJ 08901-8520, USA
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34
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Liu G, Bode A, Ma WY, Sang S, Ho CT, Dong Z. Two novel glycosides from the fruits of Morinda citrifolia (noni) inhibit AP-1 transactivation and cell transformation in the mouse epidermal JB6 cell line. Cancer Res 2001; 61:5749-56. [PMID: 11479211] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
The fruit juice of Morinda citrifolia (noni), a plant originally grown in the Hawaiian and Tahitian islands, has long been used by islanders to treat diseases, including cancer. Two novel glycosides, 6-O-(beta-D-glucopyranosyl)-1-O-octanoyl-beta-D-glucopyranose and asperulosidic acid, extracted from the juice of noni fruits, were used to examine their effects on 12-O-tedtradecanoylphorbol-13-acetate (TPA)- and epidermal growth factor (EGF)-induced AP-1 transactivation and cell transformation in mouse epidermal JB6 cells. The results indicated that both compounds were effective in suppressing TPA- or EGF-induced cell transformation and associated AP-1 activity. TPA- or EGF-induced phosphorylation of c-Jun, but not extracellular signal-regulated kinases or p38 kinases, was also blocked by the compounds, indicating that c-Jun N-terminal kinases were critical in mediating TPA- or EGF-induced AP-1 activity and subsequent cell transformation in JB6 cells.
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Affiliation(s)
- G Liu
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
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35
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Ju Y, Still CC, Sacalis JN, Li J, Ho CT. Cytotoxic coumarins and lignans from extracts of the northern prickly ash (Zanthoxylum americanum). Phytother Res 2001; 15:441-3. [PMID: 11507740 DOI: 10.1002/ptr.686] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [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: 11/11/2022]
Abstract
Four pyranocoumarins; dipetaline, alloxanthoxyletin, xanthoxyletin and xanthyletin; and two lignans; sesamin and asarinin were isolated from the northern prickly ash, Zanthoxylum americanum. To varying degrees, all inhibited the incorporation of tritiated thymidine into human leukaemia (HL-60) cells. Dipetaline was the most active with an IC(50) of 0.68 ppm, followed by alloxanthoxyletin (1.31 ppm), sesamin (2.71 ppm), asarinin (4.12 ppm), xanthoxyletin (3.48 ppm) and xanthylletin (3.84 ppm).
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Affiliation(s)
- Y Ju
- Department of Plant Science, Cook College, Rutgers University, New Brunswick, NJ 08903, USA
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36
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Mok CC, Ho CT, Siu YP, Chan KW, Kwan TH, Lau CS, Wong RW, Au TC. Treatment of diffuse proliferative lupus glomerulonephritis: a comparison of two cyclophosphamide-containing regimens. Am J Kidney Dis 2001; 38:256-64. [PMID: 11479150 DOI: 10.1053/ajkd.2001.26084] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [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: 11/11/2022]
Abstract
Cyclophosphamide (CYC) has proven beneficial in preserving renal function in patients with lupus with diffuse proliferative glomerulonephritis (DPGN). However, the optimal route of CYC administration is unknown because direct comparative studies are unavailable. In this open study, we compared the renal outcome of two historical cohorts of patients with diffuse proliferative lupus nephritis (World Health Organization classes IVa and IVb) treated with either intravenous (IV) pulse CYC (group A; n = 22) or sequential oral CYC followed by azathioprine (AZA; group B; n = 21) and followed up prospectively. Both groups of patients had similar clinical, biochemical, and renal parameters at baseline. At 24 months posttreatment, significant improvements in proteinuria, creatinine clearance, serum albumin level, and lupus serological results were evident in both groups. Compared with patients in group A, patients in group B had more complete or partial remission (90% versus 73%) and less risk for treatment failure (5% versus 14%), renal flares (5% versus 14%), and doubling of creatinine levels (5% versus 9%), but the difference was not statistically significant. However, patients treated with oral immunosuppression had an insignificant increase in rates of herpes zoster infection (19% versus 9%) and menstrual disturbance (50% versus 29%). We conclude that sequential oral immunosuppression with CYC and AZA tended to have better efficacy than IV pulse CYC in the treatment of lupus DPGN but was associated with more toxicities. Additional randomized trials involving a larger cohort of patients with a longer period of observation are necessary.
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Affiliation(s)
- C C Mok
- Department of Medicine and Geriatrics, Tuen Mun Hospital, Hong Kong,SAR, China.
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37
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Lin CC, Lu YP, Lou YR, Ho CT, Newmark HH, MacDonald C, Singletary KW, Huang MT. Inhibition by dietary dibenzoylmethane of mammary gland proliferation, formation of DMBA-DNA adducts in mammary glands, and mammary tumorigenesis in Sencar mice. Cancer Lett 2001; 168:125-32. [PMID: 11403916 DOI: 10.1016/s0304-3835(01)00506-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Dibenzoylmethane (DBM) is a minor constituent of licorice and a beta-diketone analogue of curcumin. Feeding 1% DBM in the diet to Sencar mice during both the initiation and the post-initiation periods strongly inhibited 7,12-dimethylbenz[a]anthracene (DMBA)-induced mammary tumor multiplicity and mammary tumor incidence by 97%. In further in vivo studies to elucidate the possible mechanisms of the inhibitory action of DBM, feeding the 1% DBM in the AIN-76A diet to immature Sencar mice for 4-5 weeks decreased the uterine wet weight by 43%, inhibited the proliferation rate of mammary gland epithelial cells by 53%, uterine epithelium by 23%, and uterine stroma by 77%, when mice were killed during the first estrus phase of estrous cycle. In addition, feeding 1% DBM in the diet to Sencar mice at 2 weeks before, during and 1 week after DMBA treatment (intubation of 1 mg DMBA per mouse once a week for 5 weeks) inhibited formation of total DMBA-DNA adducts in mammary glands by 72% using a post-32P-labeling assay. Thus, feeding 1% DBM diet to Sencar mice inhibited formation of DMBA-DNA adducts in mammary glands and lowered the proliferation rate of the mammary gland in vivo. These results may explain the strong inhibitory actions of dietary DBM on mammary carcinogenesis in mice.
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MESH Headings
- 9,10-Dimethyl-1,2-benzanthracene/analogs & derivatives
- 9,10-Dimethyl-1,2-benzanthracene/antagonists & inhibitors
- 9,10-Dimethyl-1,2-benzanthracene/metabolism
- 9,10-Dimethyl-1,2-benzanthracene/toxicity
- Animals
- Anticarcinogenic Agents/pharmacology
- Benzoates/pharmacology
- Carcinogens/antagonists & inhibitors
- Carcinogens/metabolism
- Carcinogens/toxicity
- Cell Division/drug effects
- Chalcones
- DNA Adducts/biosynthesis
- Diet
- Female
- Mammary Glands, Animal/cytology
- Mammary Glands, Animal/drug effects
- Mammary Glands, Animal/metabolism
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/prevention & control
- Mice
- Mice, Inbred SENCAR
- Organ Size/drug effects
- Uterus/anatomy & histology
- Uterus/cytology
- Uterus/drug effects
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Affiliation(s)
- C C Lin
- Laboratory for Cancer Research, College of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854-8020, USA
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38
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Sang S, He K, Liu G, Zhu N, Cheng X, Wang M, Zheng Q, Dong Z, Ghai G, Rosen RT, Ho CT. A new unusual iridoid with inhibition of activator protein-1 (AP-1) from the leaves of Morinda citrifolia L. Org Lett 2001; 3:1307-9. [PMID: 11348221 DOI: 10.1021/ol0156648] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure in text] From the leaves of Morinda citrifolia, a new unusual iridoid, named citrifolinoside (1), showing significant inhibition of UVB-induced Activator Protein-1 (AP-1) activity in cell cultures, has been isolated. Its structure was elucidated on the basis of detailed high-field 1D and 2D spectral analysis.
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Affiliation(s)
- S Sang
- Department of Food Science and Center for Advanced Food Technology, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, USA.
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39
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Lin CC, Ho CT, Huang MT. Mechanistic studies on the inhibitory action of dietary dibenzoylmethane, a beta-diketone analogue of curcumin, on 7,12-dimethylbenz[a]anthracene-induced mammary tumorigenesis. Proc Natl Sci Counc Repub China B 2001; 25:158-65. [PMID: 11480771] [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: 04/16/2023]
Abstract
Dietary factors play important roles in the carcinogenic process. The results of epidemiological data and some laboratory animal studies indicate that certain naturally occurring and synthetic components are able to block the carcinogenic process and inhibit the development of certain cancers. Dibenzoylmethane (DBM), a curcumin-related beta-diketone analogue has been reported to exhibit a remarkable inhibitory effect on 7,12-dimethylbenz[a]anthracene (DMBA)-induced mammary tumorigenesis in Sencar mice. The present study investigated the possible mechanisms of inhibitory action of DBM on DMBA-induced mammary tumorigenesis in mice. The summarized results indicate that: (1) in in-vitro studies. DBM inhibited DMBA metabolism and the formation of DMBA-DNA adducts in a dose-dependent manner; (2) in the assay of competitive binding to estrogen receptors with [3H]-estradiol in vitro, DBM showed weak binding affinity; (3) in vivo, feeding of 1% DBM in the diet of immature Sencar mice for 4 -5 weeks decreased the uterine and parametrial fat pad weights, and lowered the serum estrogen and triglyceride levels. This study provides insight into the mechanisms involved in the inhibitory action of DBM in mouse mammary tumorigenesis.
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MESH Headings
- 9,10-Dimethyl-1,2-benzanthracene/pharmacokinetics
- 9,10-Dimethyl-1,2-benzanthracene/toxicity
- Animals
- Anticarcinogenic Agents/pharmacology
- Anticarcinogenic Agents/therapeutic use
- Benzoates/pharmacology
- Benzoates/therapeutic use
- Binding, Competitive
- Carcinogens/pharmacokinetics
- Carcinogens/toxicity
- Cattle
- Chalcones
- Curcumin/analogs & derivatives
- Curcumin/chemistry
- Cytosol/chemistry
- DNA/drug effects
- DNA Adducts/analysis
- DNA Damage
- Dietary Fats/metabolism
- Drug Screening Assays, Antitumor
- Estradiol/blood
- Estradiol/metabolism
- Female
- Hypolipidemic Agents/pharmacology
- Hypolipidemic Agents/therapeutic use
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/prevention & control
- Mice
- Mice, Inbred SENCAR
- Microsomes, Liver/metabolism
- Molecular Structure
- Ovariectomy
- Progesterone/blood
- Rats
- Rats, Sprague-Dawley
- Receptors, Estrogen/drug effects
- Receptors, Estrogen/metabolism
- Spices
- Triglycerides/blood
- Uterus/chemistry
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Affiliation(s)
- C C Lin
- Laboratory for Cancer Research, College of Pharmacy, Rutgers, the State University of New Jersey, Piscataway, USA
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40
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Abstract
Post-curing treatments have been known to improve the mechanical stability of visible light-cured composites. After individual post-curing treatment, the flexural strength (FS) of four commercial direct/indirect placement composite materials which differ greatly in composition [oligocarbonate dimethacrylate (OCDMA)-based Conquest C & B (CQT), Bisphenol-A glycidyl dimethacrylate (BisGMA)-based Charisma, urethane dimethacrylate (UDMA)-based Concept (CCT), and BisGMA/UDMA-based Dentacolor] was evaluated under water in the temperature range of 12-50 degrees C. A control series was tested in air at room temperature (25 +/- 1 degrees C). Data were analysed using ANOVA and Duncan's test. Flexural strengths overall decreased (20-40%, P < 0.01) with increasing temperatures except with Conquest C & B. Surprisingly, higher FS values were found in wet conditions than in dry conditions at 25 degrees C. UDMA-based materials much more easily undergo softening in water and by temperature change than do BisGMA- or OCDMA-based materials. Post-cured composites can be significantly affected by exposure to oral environments. Different composition determines the degree of influence.
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Affiliation(s)
- C T Ho
- Dental Department of Chang-Gung Memorial Hospital, Taipei, Taiwan, ROC
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41
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Sang S, Cheng X, Zhu N, Wang M, Jhoo JW, Stark RE, Badmaev V, Ghai G, Rosen RT, Ho CT. Iridoid glycosides from the leaves of Morinda citrifolia. J Nat Prod 2001; 64:799-800. [PMID: 11421748 DOI: 10.1021/np010011l] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new iridoid glucoside (1), named citrifolinoside A, was isolated from the leaves of Morinda citrifolia along with the known iridoids asperuloside and asperulosidic acid. The structure of 1 was established by interpretation and full assignments of NMR spectroscopic data.
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Affiliation(s)
- S Sang
- Department of Food Science and Center for Advanced Food Technology, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, USA
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42
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Abstract
Presenting clicks according to maximum length sequences (MLSs) enables transient evoked otoacoustic emissions (TEOAEs) to be recorded at very high stimulation rates. Despite a decrease in TEOAE amplitude, the very large number of responses obtainable at high rates means that both signal to noise ratio (SNR) and detection sensitivity increase as the click rate increases. This study characterises conventional and MLS TEOAEs near threshold for a group of normally hearing adults. Stimulus presentation rates of 40 clicks/s (conventional) and 5000 clicks/s (MLS) were used. Compared to conventional recordings, the MLS technique enabled smaller responses to be detected, when averaged for the same time and to the same SNR. TEOAE amplitude recorded at detection threshold for MLS responses was 13 dB lower than that recorded conventionally. For each individual, MLS recording also produced clear, repeatable responses at stimulus levels below the detection threshold for conventional TEOAEs. The click level at TEOAE threshold was 12 dB lower for MLS compared to conventional emissions. These results suggest that TEOAE thresholds are not absolute but strongly related to the detection sensitivity of the recording system and physiological noise. The initial growth rates and the shape of input/output functions were found to be similar for the two recording techniques.
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Affiliation(s)
- J E Hine
- MRC Institute of Hearing Research, Royal South Hants Hospital, Southampton, UK.
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43
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Meng X, Lee MJ, Li C, Sheng S, Zhu N, Sang S, Ho CT, Yang CS. Formation and identification of 4'-O-methyl-(-)-epigallocatechin in humans. Drug Metab Dispos 2001; 29:789-93. [PMID: 11353745] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
The possible beneficial effects of tea consumption have attracted a great deal of attention. Many of the biological effects have been attributed to tea catechins, but the metabolic fate of these compounds is not clear. In the present study, a major metabolite observed in human blood and urine samples after green tea administration was identified as a O-methylated derivative of (-)-epigallocatechin (EGC) by comparison with products from chemical and enzymatic O-methylation of EGC. The structure of this metabolite was elucidated as 4'-O-methyl-(-)-epigallocatechin (4'-O-MeEGC) by (1)H and (13)C NMR and heteronuclear multiple bond connectivity experiment. The human plasma level of 4'-O-MeEGC reached its peak value within the first 2 h following tea ingestion. Its maximum concentration was 4 to 6 times higher than that of EGC. The half-lives of EGC and 4'-O-MeEGC in the blood were 1.02 +/- 0.07 and 4.39 +/- 1.14 h, respectively. The amount of 4'-O-MeEGC excreted in urine was about 3 times higher than that of EGC, and 88% of 4'-O-MeEGC was excreted in urine within 8 h. The present structural information and concentration-time profile of this metabolite provide the basis for understanding the biotransformation of EGC and for future elucidation of its biological activities.
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Affiliation(s)
- X Meng
- Laboratory for Cancer Research, Rutgers, The State University of New Jersey, Piscataway 08854-8020, USA
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44
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Abstract
The structures of two new cycloartane-type saponin constituents of the roots of Cimicifuga foetida were established by the interpretation of spectroscopic data as 2'-O-acetylactein (1) and 2'-O-acetyl-27-deoxyactein (2), respectively. Also isolated were the known compounds actein, 27-deoxyactein, cimicifugoside H-1, and 15alpha-hydroxycimicidol 3-O-beta-D-xyloside.
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Affiliation(s)
- N Zhu
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, USA
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45
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Zhu N, Kikuzaki H, Vastano BC, Nakatani N, Karwe MV, Rosen RT, Ho CT. Ecdysteroids of quinoa seeds (Chenopodium quinoa Willd.). J Agric Food Chem 2001; 49:2576-2578. [PMID: 11368638 DOI: 10.1021/jf0014462] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Quinoa (Chenopodium quinoa) is a hardy and nutritious Latin American pseudo-cereal. Studies on the seeds led to the isolation of five ecdysteroids using column chromatography. Their structures were determined as ecdysterone, makisterone A, 24-epi-makisterone A, 24(28)-dehydromakisterone A, and 20,26-dihydroxyecdysone by spectroscopic methods. This study demonstrates that quinoa seeds are a source of ecdysteroids, which were reported to be molting hormones in insects.
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Affiliation(s)
- N Zhu
- Department of Food Science and Center for Advanced Food Technology, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, USA
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46
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Zhu N, Rafi MM, DiPaola RS, Xin J, Chin CK, Badmaev V, Ghai G, Rosen RT, Ho CT. Bioactive constituents from gum guggul (Commiphora wightii). Phytochemistry 2001; 56:723-727. [PMID: 11314959 DOI: 10.1016/s0031-9422(00)00485-4] [Citation(s) in RCA: 29] [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: 05/23/2023]
Abstract
Bioactivity-directed fractionation and purification afforded cytotoxic components of Commiphora wightii. The exudates of C. wightii were extracted with EtOAc and the extract was subjected to repeated column chromatography. A fraction showing cytotoxic activity was characterized as a mixture of two ferulates with an unusual skeleton by spectral and chemical methods, including by NMR, GC-MS and chemical derivatization. This fraction also showed moderate scavenging effect against 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals.
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Affiliation(s)
- N Zhu
- Department of Food Science and Center for Advanced Food Technology, Rutgers University, New Brunswick, NJ 08901, USA
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47
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Abstract
Extrusion cooking is a high temperature-short time process which is ideal for the production of flavor volatiles. However, due to the nature of this process there are many opportunities for these volatiles to be lost. This has led many researchers to study the formation and retention of volatiles during extrusion. This review will focus on-the flavor related reactions which may occur during extrusion and their occurrence in various flours and due to the addition of reactive precursors.
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Affiliation(s)
- W E Riha
- Department of Food Science, New Jersey Agricultural Experiment Station Rutgers, State University of New Jersey, New Brunswick 08903, USA
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48
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Abstract
The stability of the biologically active compound vitamin B(6) in aqueous solution was investigated. Schiff base formation is the major reaction between the epsilon-amino group of lysine and the aldehyde group of both pyridoxal and pyridoxal phosphate. Model systems composed of equal molar concentrations of lysine with either pyridoxal or pyridoxal phosphate were used to study the effect of proton transfer on Schiff base formation. Pyridoxylidenelysine was found to be the major product in both lysine/pyridoxal and lysine/pyridoxal phosphate systems. Quantitation of residual pyridoxal and pyridoxal phosphate was conducted using an HPLC to evaluate the degradation of pyridoxal and pyridoxal phosphate. The results indicate both the free phosphate ion in the buffer system and the bound phosphate on pyridoxal phosphate can enhance the formation of the Schiff base. The phosphate group serves as both proton donor and acceptor, which catalyzes the Schiff base formation. The aldehyde group on pyridoxal phosphate was found to be much more reactive than that on pyridoxal. The bound phosphate group on pyridoxal phosphate, with proton donating and accepting groups in close proximity, can simultaneously donate and accept protons, thus enhancing Schiff base formation between the aldehyde group and the epsilon-amino group. The deterioration rate of pyridoxal phosphate was faster than that of pyridoxal in an aqueous system.
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Affiliation(s)
- T C Huang
- Department of Food Science, National Pingtung University of Science and Technology, 912 Pingtung, Taiwan.
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49
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Abstract
Four new steroidal saponins, 26-O-beta-D-glucopyranosyl-(25S,20R)-20-O-methyl-5alpha-furost-22(23)-en-2alpha,3beta,20,26-tetraol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside (1); 26-O-beta-D-glucopyranosyl-(25S,20R)-5alpha-furost-22(23)-en-2alpha,3beta,20,26-tetraol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L- rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside (2); 26-O-beta-D-glucopyranosyl-(25S,20S)-5alpha-furost-22(23)-en-2alpha,3beta,20,26-tetraol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L- rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside (3); and 26-O-beta-D-glucopyranosyl-(25S,20S)-5alpha-furost-22(23)-en-3beta,20,26-triol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside (4), have been isolated from the seeds of Allium tuberosum. Their structures were established by spectroscopic studies such as MS, IR, NMR, and 2D-NMR and the results of acid hydrolysis and named tuberosides F, G, H, and I, respectively.
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Affiliation(s)
- S Sang
- Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, People's Republic of China
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50
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Pan MH, Chang WL, Lin-Shiau SY, Ho CT, Lin JK. Induction of apoptosis by garcinol and curcumin through cytochrome c release and activation of caspases in human leukemia HL-60 cells. J Agric Food Chem 2001; 49:1464-1474. [PMID: 11312881 DOI: 10.1021/jf001129v] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Garcinol, a polyisoprenylated benzophenone, was purified from Garcinia indica fruit rind. The effects of garcinol and curcumin on cell viability in human leukemia HL-60 cells were investigated. Garcinol and curcumin displayed strong growth inhibitory effects against human leukemia HL-60 cells, with estimated IC(50) values of 9.42 and 19.5 microM, respectively. Garcinol was able to induce apoptosis in a concentration- and time-dependent manner; however, curcumin was less effective. Treatment with garcinol caused induction of caspase-3/CPP32 activity in a dose- and time-dependent manner, but not caspase-1 activity, and induced the degradation of poly(ADP-ribose) polymerase (PARP). Pretreatment with caspase-3 inhibitor inhibited garcinol-induced DNA fragmentation. Treatment with garcinol (20 microM) caused a rapid loss of mitochondrial transmembrane potential, release of mitochondrial cytochrome c into cytosol, and subsequent induction of procaspase-9 processing. The cleavage of D4-GDI, an abundant hematopoietic cell GDP dissociation inhibitor for the Ras-related Rho family GTPases, occurred simultaneously with the activation of caspase-3 but preceded DNA fragmentation and the morphological changes associated with apoptotic cell death. Of these, Bcl-2, Bad, and Bax were studied. The level of expression of Bcl-2 slightly decreased, while the levels of Bad and Bax were dramatically increased in cells treated with garcinol. These results indicate that garcinol allows caspase-activated deoxyribonuclease to enter the nucleus and degrade chromosomal DNA and induces DFF-45 (DNA fragmentation factor) degradation. It is suggested that garcinol-induced apoptosis is triggered by the release of cytochrome c into the cytosol, procaspase-9 processing, activation of caspase-3 and caspase-2, degradation of PARP, and DNA fragmentation caused by the caspase-activated deoxyribonuclease through the digestion of DFF-45. The induction of apoptosis by garcinol may provide a pivotal mechanism for its cancer chemopreventive action.
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Affiliation(s)
- M H Pan
- Institutes of Biochemistry and Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan
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