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Chen H, Xu MM, Sun YT, Yu S, Yang DQ. [Inhibitory effect of Streptococcus mutans antisense vicK RNA regulating the cariogenicity of oral streptococci multi-species biofilm]. Zhonghua Kou Qiang Yi Xue Za Zhi 2024; 59:64-70. [PMID: 38172063 DOI: 10.3760/cma.j.cn112144-20231031-00229] [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: 01/05/2024]
Abstract
Objective: To investigate the regulative effects of Streptococcus mutans (Sm) antisense vicK RNA (ASvicK) on the multi-species biofilm formed by three common oral streptococci (Sm, Streptococcus sanguinis, and Streptococcus gordonii) (Sm+Ss+Sg). Methods: ASvicK over-expression strain was constructed by using a recombinant plasmid, and three-species biofilm UA159+Ss+Sg and ASvicK+Ss+Sg were cultured. The phenotypes of biofilms were detected by scanning electron microscopy (SEM). Crystal violet (CV) assay was used to detect biofilm biomass. Lactate kit and anthrone-sulfuric acid colorimetric assay were used to determine the abilities of lactic acid and exopolysaccharides production, respectively. The proportions of three-species and expression levels of the cariogenic-related genes in biofilms were detected by TaqMan fluorescence quantitative PCR and real-time fluorescence quantitative PCR. A biofilm demineralization model of human enamel slabs was further constructed, and the hardness of enamel surface was detected. Results: Compared to UA159+Ss+Sg, over-expression of ASvicK could inhibit biofilm formation and lactic acid production in ASvicK+Ss+Sg biofilm significantly decreased by 78.93% (P<0.001) and 62.23% (P<0.001), respectively. With ASvicK over-expression, the amounts of water-insoluble and-soluble glucoses in ASvicK+Ss+Sg biofilm were reduced respectively by 39.13% (P<0.001) and 68.00% (P<0.001). Compared to the UA159+Ss+Sg Group, the proportion of Sm, the cariogenic bacteria, showed 33.00% reduction (P<0.01) in Sm+Ss+Sg biofilm, and the gene expressions of cariogenic-relative genes vicK/X, gtfB/C/D, and ftf significantly decreased (P<0.05). The micro-hardness value of enamel slabs after demineralization by ASvicK+Ss+Sg biofilm was significantly increased to 183.84% (P<0.001). Conclusions: ASvicK over-expression could reduce the Sm proportion and weaken the cariogenicity of oral Streptococcus biofilm, thereby possibly slowing down the progression of caries.
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Affiliation(s)
- H Chen
- Department of Endodontics, Stomatological Hospital of Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - M M Xu
- Department of Endodontics, Stomatological Hospital of Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Y T Sun
- Department of Endodontics, Stomatological Hospital of Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - S Yu
- Department of Endodontics, Stomatological Hospital of Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - D Q Yang
- Department of Endodontics, Stomatological Hospital of Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
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Niu SL, Hao JH, Xu JY, Guan Q, Zhou ZC, Lv TM, Sun YT. Aculebiphenyl A-B, new biphenyl derivatives from Ruscus aculeatus. J Asian Nat Prod Res 2023; 25:1076-1084. [PMID: 37724355 DOI: 10.1080/10286020.2023.2254702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 08/29/2023] [Indexed: 09/20/2023]
Abstract
The investigation of chemical constituents from the rhizomes of Ruscus aculeatus resulted in the isolation of two new biphenyl derivatives, aculebiphenyls A and B (1-2), together with two known analogs (3-4). Their chemical structures were elucidated based on extensive spectroscopic interpretation and HR-ESI-MS analysis. Compounds 3-4 were isolated from the Ruscus genus for the first time. The isolated compounds were tested for anti-inflammatory activities and antibacterial activities. Compound 1 exhibited significant inhibitory effects on LPS-induced NO production and COX-2 with IC50 values of 10.8 µM and 0.4 µM. Compound 1 also significantly down-regulated the levels of inflammatory cytokines IL-1β, IL-6, and TNF-α. Compound 1 showed moderate antibacterial activities.
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Affiliation(s)
- Sheng-Li Niu
- Key Laboratory of Livestock Infectious Diseases, Ministry of Education, Key Laboratory of Ruminant Infectious Disease Prevention and Control (East), Ministry of Agriculture and Rural Affairs, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
| | - Jia-Hui Hao
- Key Laboratory of Livestock Infectious Diseases, Ministry of Education, Key Laboratory of Ruminant Infectious Disease Prevention and Control (East), Ministry of Agriculture and Rural Affairs, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
| | - Jing-Yi Xu
- Key Laboratory of Livestock Infectious Diseases, Ministry of Education, Key Laboratory of Ruminant Infectious Disease Prevention and Control (East), Ministry of Agriculture and Rural Affairs, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
| | - Qi Guan
- Key Laboratory of Livestock Infectious Diseases, Ministry of Education, Key Laboratory of Ruminant Infectious Disease Prevention and Control (East), Ministry of Agriculture and Rural Affairs, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
| | - Zhen-Chi Zhou
- Key Laboratory of Livestock Infectious Diseases, Ministry of Education, Key Laboratory of Ruminant Infectious Disease Prevention and Control (East), Ministry of Agriculture and Rural Affairs, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
| | - Tian-Meng Lv
- Key Laboratory of Livestock Infectious Diseases, Ministry of Education, Key Laboratory of Ruminant Infectious Disease Prevention and Control (East), Ministry of Agriculture and Rural Affairs, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
| | - Ya-Ting Sun
- School of Pharmacy, Shenyang Medical College, Shenyang 110034, China
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Pang SN, Wang F, Sun YT, Mao F, Gao CZ. Effects of semicore electrons on stopping power in helium-irradiated aluminum nanosheets. Phys Chem Chem Phys 2023. [PMID: 37408492 DOI: 10.1039/d3cp01506h] [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: 07/07/2023]
Abstract
The stopping power of energetic He ions traversing an Al film is studied by combining the time-dependent density-functional theory method with molecular dynamics simulations. We investigated the dependence of the semicore electron excitation of the Al film on the projectile's trajectory and its charge state. Our results show that for the off-channeling trajectories the semicore electrons contribute significantly to the stopping power of the Al film as the He+ ion velocity exceeds 1.0 a.u, and in contrast, it is negligible for the channeling trajectories. Most importantly, we found two unexpected effects of semicore electrons on the stopping power in helium-irradiated aluminum nanosheets, i.e., (1) the semicore electrons can contribute to the energy loss for both high and low energy projectiles under the off-channeling trajectory; (2) as the projectile velocity increases from 0.4 a.u. to 2.0 a.u. although semicore electron excitation (including transition in the target, ionization away from the target and transfer to the projectile ion) of the target atom is gradually inhibited, the influence of semicore electrons on valence electron excitation is gradually enhanced. Our finding allows us to gain new insights into the stopping of ions in metals.
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Affiliation(s)
- Su-Na Pang
- School of Physics, Beijing Institute of Technology, Beijing, China.
| | - Feng Wang
- School of Physics, Beijing Institute of Technology, Beijing, China.
| | - Ya-Ting Sun
- School of Physics, Beijing Institute of Technology, Beijing, China.
| | - Fei Mao
- School of Nuclear Science and Technology, University of South China, Hengyang, China.
| | - Cong-Zhang Gao
- Institute of Applied Physics and Computational Mathematics, Beijing, China.
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Sun YT, Zhu AZ. Correlation between CDK1 protein and CDK1 mRNA during oocyte maturation in mouse. Int J Dev Biol 2022; 66:305-309. [PMID: 35770734 DOI: 10.1387/ijdb.220002za] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The aim of this study was to investigate the correlation between CDK1 protein and CDK1 mRNA during oocyte maturation in vivo in mouse. GV, GVBD, MI and MII oocytes were obtained from mice, respectively. Western blot validated that the CDK1 protein expression increased continuously and significantly with oocyte maturation in vivo (P<0.05). Real-time qRT-PCR showed that CDK1 mRNA expression was down-regulated significantly during transformation from GV to MI stages (P<0.05), and up-regulated significantly during transformation from MI to MII stages (P<0.05). The level of CDK1 mRNA peaked at MII stages. Spearman correlation analysis indicated that CDK1 protein expression was poor correlation with CDK1 mRNA expression during oocyte maturation in vivo (R=0.200). This finding suggested that the increase of CDK1 protein during oocyte maturation in vivo was not entirely caused by the change of transcription level. The results provide new food for thought for further research on the molecular mechanism of oocyte maturation in vivo.
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Affiliation(s)
- Ya-Ting Sun
- Reproductive Medicine department, Yuncheng Central Hospital of Shanxi Province, Yuncheng, Shanxi, China
| | - Ai-Zhen Zhu
- Reproductive Medicine department, Yuncheng Central Hospital of Shanxi Province, Yuncheng, Shanxi, China
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Li JH, Ma J, Kang W, Wang CF, Bai F, Zhao K, Yao N, Liu Q, Dang BL, Wang BW, Wei QQ, Kang WZ, Sun YT. The histone deacetylase inhibitor chidamide induces intermittent viraemia in HIV-infected patients on suppressive antiretroviral therapy. HIV Med 2020; 21:747-757. [PMID: 33369029 DOI: 10.1111/hiv.13027] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVES To evaluate the safety and efficacy of chidamide to reverse HIV-1 latency in vivo and to compare the effects of four clinically tested histone deacetylase (HDAC) inhibitors on non-histone proteins in vitro. METHODS Participants received chidamide orally at 10 mg twice weekly for 4 weeks while maintaining baseline antiretroviral therapy. The primary outcome was plasma viral rebound during chidamide dosing and the secondary outcomes were safety, pharmacokinetic and pharmacodynamic profiles, changes in cell-associated HIV-1 RNA and HIV-1 DNA, and immune parameters. Western blotting was used to compare the in vitro effects of the four HDAC inhibitors on HSP90, NF-κB and AP-1. RESULTS Seven aviraemic participants completed eight oral doses of chidamide, and only grade 1 adverse events were observed. Cyclic increases in histone acetylation were also detected. All participants showed robust and repeated plasma viral rebound (peak viraemia 147-3850 copies/mL), as well as increased cell-associated HIV-1 RNA, during chidamide treatment. Furthermore, we identified an enhanced HIV-1-specific cellular immune response and a modest 37.7% (95% CI: 12.7-62.8%, P = 0.028) reduction in cell-associated HIV-1 DNA. Compared with the other three HDAC inhibitors, chidamide had minimal cytotoxicity in vitro at clinically relevant concentrations and showed mechanistically superior effects on non-histone proteins, including HSP90, NF-κB and AP-1. CONCLUSIONS Chidamide safely and vigorously disrupts HIV-1 latency in vivo, which makes it a promising latency-reversing agent.
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Affiliation(s)
- J H Li
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - J Ma
- Department of Gastroenterology, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - W Kang
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - C F Wang
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - F Bai
- Department of Infectious Diseases, 986 Hospital of Air Force affiliated to Xijing Hospital, The Air Force Military Medical University, Xi'an, China
| | - K Zhao
- Department of Infectious Diseases, 986 Hospital of Air Force affiliated to Xijing Hospital, The Air Force Military Medical University, Xi'an, China
| | - N Yao
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - Q Liu
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - B L Dang
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - B W Wang
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - Q Q Wei
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - W Z Kang
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
| | - Y T Sun
- Department of Infectious Diseases, Tangdu Hospital, The Air Force Military Medical University, Xi'an, China
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Cheng CC, Sun YT, Lee AW, Huang SY, Fan WL, Chiao YH, Tsai HC, Lai JY. Self-Assembled Supramolecular Micelles with pH-Responsive Properties for More Effective Cancer Chemotherapy. ACS Biomater Sci Eng 2020; 6:4096-4105. [PMID: 33463316 DOI: 10.1021/acsbiomaterials.0c00644] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
pH-Responsive hydrogen-bonded supramolecular micelles, composed of a water-soluble poly(ethylene glycol) polymer with two terminal sextuple hydrogen bonding groups, can spontaneously organize in aqueous media to give well-defined, uniformly sized spherical micelles. The supramolecular micelles exhibit a number of unique physical characteristics, such as interesting amphiphilic behavior, desirable micellar size and nanospherical morphology, excellent biocompatibility, tailorable drug-loading capacities, and high structural stability in media containing serum or red blood cells. In addition, the drug release kinetics of drug-loaded micelles can be easily manipulated to achieve the desired release profile by regulating the environmental pH, thus these micelles are highly attractive candidates as an intelligent drug carrier system for cancer therapy. Cytotoxicity assays showed that the drug-loaded micelles induced pH-dependent intracellular drug release and exerted strong antiproliferative and cytotoxic activities toward cancer cells. Importantly, cellular uptake and flow cytometric analyses confirmed that a mildly acidic intracellular environment significantly increased cellular internalization of the drug-loaded micelles and subsequent drug release in the cytoplasm and nucleus of cancer cells, resulting in more effective induction of apoptotic cell death. Thus, this system may provide an efficient route toward achieving the fundamental properties and practical realization of pH-sensitive drug-delivery systems for chemotherapy.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.,Advanced Membrane Materials Research Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Ya-Ting Sun
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Ai-Wei Lee
- Department of Anatomy and Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan.,Cardiovascular Research Center, Taipei Medical University Hospital, Taipei, 11031, Taiwan.,Taipei Heart Institute, Taipei Medical University, Taipei, 11031, Taiwan
| | - Shan-You Huang
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Wen-Lu Fan
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Yu-Hsuan Chiao
- Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Hsieh-Chih Tsai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.,Advanced Membrane Materials Research Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Juin-Yih Lai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.,Advanced Membrane Materials Research Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.,R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 32043, Taiwan
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Yao N, Wang SN, Lian JQ, Sun YT, Zhang GF, Kang WZ, Kang W. [Clinical characteristics and influencing factors of patients with novel coronavirus pneumonia combined with liver injury in Shaanxi region]. Zhonghua Gan Zang Bing Za Zhi 2020; 28:234-239. [PMID: 32153170 DOI: 10.3760/cma.j.cn501113-20200226-00070] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Objective: To understand the clinical characteristics, change of liver function, influencing factors and prognosis in hospitalized patients with coronavirus disease-19 (COVID-19) combined with liver injury. Methods: The general conditions, biochemical indicators of liver, blood clotting mechanism, routine blood test, UGT1A1 * 28 gene polymorphism and other data of 40 cases with COVID-19 admitted to the isolation ward of Tangdu Hospital were retrospectively analyzed. The clinical characteristics, influencing factors and prognosis of liver injury in patients with liver injury group and those with normal liver function group were compared. The mean of two samples in univariate analysis was compared by t-test and analysis of variance. The counting data was measured by χ(2) tests. The non-normal distribution measurement data were described by the median, and the non-parametric test was used. Statistically significant influencing factors were used as the independent variables in univariate analysis. Multiple logistic regression analysis was used to analyze the main influencing factors of liver injury. Results: Of the 40 cases, 25 were male (62.5%) and 15 were female (37.5%), aged 22 to 83 (53.87 ± 15.84) years. Liver injury was occurred in 22 cases (55%) during the course of the disease. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) level was initially increased (4.4 to 3.5 times of the normal value) along with decrease of albumin in the second week, and the difference was statistically significant (P < 0.001). Ten cases (43.5%) had highest abnormal total blood bilirubin (54.1 μmol/ L). There was no correlation between the increase in transaminase and the increase in total blood bilirubin (R = -0.006, P = 0.972). Three cases had prothrombin activity (PTA) of ≤50%, 10 cases had elevated FDP, and 13 cases had elevated D-dimer, all of whom were severe or critically ill. Liver function injury was more likely to occur in patients who used many types of drugs and large amounts of hormones (P = 0.002, P = 0.031), and there was no correlation with the TA6TA7 mutation in the UGT1A1 * 28 gene locus. Multiple regression analysis showed that the occurrence of liver injury was only related to critical illness. The liver function of all patients had recovered within one week after conventional liver protection treatment. Conclusion: COVID-19 combined with liver function injury may be due to the slight elevation of transaminase, mostly around the second week of the disease course. Severe patients have a higher proportion of liver injury, and critical type is an independent risk factor for liver injury.
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Affiliation(s)
- N Yao
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
| | - S N Wang
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
| | - J Q Lian
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
| | - Y T Sun
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
| | - G F Zhang
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
| | - W Z Kang
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
| | - W Kang
- Department of Infectious Diseases, Tangdu Hospital, the Air Force Medical University, Xi'an 710038, China
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Cheng CC, Sun YT, Lee AW, Huang SY, Fan WL, Chiao YH, Chiu CW, Lai JY. Hydrogen-bonded supramolecular micelle-mediated drug delivery enhances the efficacy and safety of cancer chemotherapy. Polym Chem 2020. [DOI: 10.1039/d0py00082e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Multiple hydrogen-bonded supramolecular polymers tend to form stable spherical micelles with oppositely charged anticancer drugs in biological environments, which improves cellular drug uptake and more effectively induces apoptosis in cancer cells.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
- Advanced Membrane Materials Research Center
| | - Ya-Ting Sun
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Ai-Wei Lee
- Department of Anatomy and Cell Biology
- School of Medicine
- College of Medicine
- Taipei Medical University
- Taipei
| | - Shan-You Huang
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Wen-Lu Fan
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Yu-Hsuan Chiao
- Department of Chemical Engineering
- University of Arkansas
- Fayetteville
- USA
| | - Chih-Wei Chiu
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Juin-Yih Lai
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
- Advanced Membrane Materials Research Center
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Cheng CC, Gebeyehu BT, Huang SY, Abebe Alemayehu Y, Sun YT, Lai YC, Chang YH, Lai JY, Lee DJ. Entrapment of an adenine derivative by a photo-irradiated uracil-functionalized micelle confers controlled self-assembly behavior. J Colloid Interface Sci 2019; 552:166-178. [PMID: 31125827 DOI: 10.1016/j.jcis.2019.05.055] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/17/2019] [Accepted: 05/18/2019] [Indexed: 11/15/2022]
Abstract
HYPOTHESIS Invoking cooperative assembly of the uracil-functionalized supramolecular polymer BU-PPG [uracil end-capped poly(propylene glycol)] upon association with the nucleobase adenine derivative A-MA [methyl 3-(6-amino-9H-purin-9-yl)propanoate] as a model drug provides a new concept to control and tune the properties of supramolecular complexes and holds significant potential for the development of safer, more effective drug delivery systems. EXPERIMENTS BU-PPG and A-MA were successfully developed and exhibited specific recognition and high affinity, which enabled reversible complementary adenine-uracil (A-U) hydrogen bonding-induced formation of spherical micelles in aqueous solution. The self-assembly and controllable A-MA release behavior of BU-PPG/A-MA micelles were studied using morphological analysis and optical and light scattering techniques to investigate the effect of photoirradiation and temperature on the complementary hydrogen bond interactions between BU-PPG and A-MA. FINDINGS The resulting micelles possess unusual physical properties, including controlled photoreactivity kinetics, controllable self-assembled morphology and low cytotoxicity in vitro, as well as reversible temperature-responsive behavior. Importantly, irradiated micelles exhibited excellent long-term structural stability under normal physiological conditions and serum disturbance. Increasing the temperature triggered rapid release of A-MA by disrupting A-U complexes. These findings represent an entirely new, promising strategy for the development of multi-controlled release drug delivery nanocarriers based on complementary hydrogen bonding interactions.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; Advanced Membrane Materials Research Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Belete Tewabe Gebeyehu
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Shan-You Huang
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Yihalem Abebe Alemayehu
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Ya-Ting Sun
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - You-Cheng Lai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Yi-Hsuan Chang
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Juin-Yih Lai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; Advanced Membrane Materials Research Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 32043, Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
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Hou FQ, Yin YL, Zeng LY, Shang J, Gong GZ, Pan C, Zhang MX, Yin CB, Xie Q, Peng YZ, Chen SJ, Mao Q, Chen YP, Mao QG, Zhang DZ, Han T, Wang MR, Zhao W, Liu JJ, Han Y, Zhao LF, Luo GH, Zhang JM, Peng J, Tan DM, Li ZW, Tang H, Wang H, Zhang YX, Li J, Zhang LL, Chen L, Jia JD, Chen CW, Zhen Z, Li BS, Niu JQ, Meng QH, Yuan H, Sun YT, Li SC, Sheng JF, Cheng J, Sun L, Wang GQ. [Clinical effect and safety of pegylated interferon-α-2b injection (Y shape, 40 kD) in treatment of HBeAg-positive chronic hepatitis B patients]. Zhonghua Gan Zang Bing Za Zhi 2019; 25:589-596. [PMID: 29056008 DOI: 10.3760/cma.j.issn.1007-3418.2017.08.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Objective: To investigate the clinical effect and safety of long-acting pegylated interferon-α-2b (Peg-IFN-α-2b) (Y shape, 40 kD) injection (180 μg/week) in the treatment of HBeAg-positive chronic hepatitis B (CHB) patients, with standard-dose Peg-IFN-α-2a as positive control. Methods: This study was a multicenter, randomized, open-label, and positive-controlled phase III clinical trial. Eligible HBeAg-positive CHB patients were screened out and randomized to Peg-IFN-α-2b (Y shape, 40 kD) trial group and Peg-IFN-α-2a control group at a ratio of 2:1. The course of treatment was 48 weeks and the patients were followed up for 24 weeks after drug withdrawal. Plasma samples were collected at screening, baseline, and 12, 24, 36, 48, 60, and 72 weeks for centralized detection. COBAS® Ampliprep/COBAS® TaqMan® HBV Test was used to measure HBV DNA level by quantitative real-time PCR. Electrochemiluminescence immunoassay with Elecsys kit was used to measure HBV markers (HBsAg, anti-HBs, HBeAg, anti-HBe). Adverse events were recorded in detail. The primary outcome measure was HBeAg seroconversion rate after the 24-week follow-up, and non-inferiority was also tested. The difference in HBeAg seroconversion rate after treatment between the trial group and the control group and two-sided confidence interval (CI) were calculated, and non-inferiority was demonstrated if the lower limit of 95% CI was > -10%. The t-test, chi-square test, or rank sum test was used according to the types and features of data. Results: A total of 855 HBeAg-positive CHB patients were enrolled and 820 of them received treatment (538 in the trial group and 282 in the control group). The data of the full analysis set showed that HBeAg seroconversion rate at week 72 was 27.32% in the trial group and 22.70% in the control group with a rate difference of 4.63% (95% CI -1.54% to 10.80%, P = 0.1493). The data of the per-protocol set showed that HBeAg seroconversion rate at week 72 was 30.75% in the trial group and 27.14% in the control group with a rate difference of 3.61% (95% CI -3.87% to 11.09%, P = 0.3436). 95% CI met the non-inferiority criteria, and the trial group was non-inferior to the control group. The two groups had similar incidence rates of adverse events, serious adverse events, and common adverse events. Conclusion: In Peg-IFN-α regimen for HBeAg-positive CHB patients, the new drug Peg-IFN-α-2b (Y shape, 40 kD) has comparable effect and safety to the control drug Peg-IFN-α-2a.
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Affiliation(s)
- F Q Hou
- Department of Infectious Diseases, Center for Liver Diseases, Peking University First Hospital, Beijing 100034, China
| | - Y L Yin
- Xiamen Amoytop Biotech Co., Ltd, Xiamen 361028, China
| | - L Y Zeng
- Xiamen Amoytop Biotech Co., Ltd, Xiamen 361028, China
| | - J Shang
- Henan Provincial People's Hospital, Zhengzhou 450003, China
| | - G Z Gong
- The Second Xiangya Hospital of Central South University, Changsha 410011, China
| | - C Pan
- Fuzhou Infectious Disease Hospital, Fuzhou 350025, China
| | - M X Zhang
- The Sixth People's Hospital of Shenyang, Shenyang 110006, China
| | - C B Yin
- Guangzhou Eighth People's Hospital, Guangzhou 510060, China
| | - Q Xie
- Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Y Z Peng
- Peking University Shenzhen Hospital, Shenzhen 518036, China
| | - S J Chen
- Jinan Infectious Disease Hospital, Jinan 250021, China
| | - Q Mao
- Southeast Hospital, Third Military Medical University, Chongqing 400038, China
| | - Y P Chen
- The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Q G Mao
- Xiamen Hospital of T.C.M, Xiamen 361001, China
| | - D Z Zhang
- The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China
| | - T Han
- Tianjin Third Central Hospital, Tianjin 300170, China
| | - M R Wang
- 81th Hospital of People's Liberation Army, Nanjing 210002, China
| | - W Zhao
- The Second Affiliated Hospital of the Southeast University, Nanjing 210003, China
| | - J J Liu
- The First Affiliated Hospital of Xiamen University, Xiamen 361003, China
| | - Y Han
- Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - L F Zhao
- The First Affiliated Hospital of Shanxi University, Taiyuan 030001, China
| | - G H Luo
- The First Affiliated Hospital of Guangxi Medical Universtiy, Nanning 530021, China
| | - J M Zhang
- Huashan Hospital, Shanghai 200040, China
| | - J Peng
- Nangfang Hospital, Southern Medical University, Guangzhou 510510, China
| | - D M Tan
- Xiangya Hospital Central South University, Changsha 410008, China
| | - Z W Li
- Shengjing Hospital of China Medical University, Shenyang 110022, China
| | - H Tang
- West China Hospital, Sichuan University, Chengdu 610041, China
| | - H Wang
- Peking University People's Hospital, Beijing 100044, China
| | - Y X Zhang
- The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, China
| | - J Li
- Jiangsu Provincial People's Hospital, Nanjing 210029, China
| | - L L Zhang
- The First Affiliated Hospital of Nanchang University, Nanchang 360102, China
| | - L Chen
- Shanghai Public Health Clinical Center, Shanghai 201508, China
| | - J D Jia
- Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - C W Chen
- 85th Hospital of People's Liberation Army, Shanghai 200052, China
| | - Z Zhen
- The Third Affiliated Hospital of Hebei Medical University, Shijiazhuang 050051, China
| | - B S Li
- 302 Military Hospital of China, Beijing 100039, China
| | - J Q Niu
- The First Bethune Hospital of Jilin University, Chanchun 130062, China
| | - Q H Meng
- Beijing Youan Hospital, Captial Medical University, Beijing 100069, China
| | - H Yuan
- The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Y T Sun
- Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - S C Li
- The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - J F Sheng
- The First Affiliated Hospital of Zhejiang University, Hangzhou 310003, China
| | - J Cheng
- Beijing Ditan Hospital Capital Medical University, Beijing 100015, China
| | - L Sun
- Xiamen Amoytop Biotech Co., Ltd, Xiamen 361028, China
| | - G Q Wang
- Department of Infectious Diseases, Center for Liver Diseases, Peking University First Hospital, Beijing 100034, China
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Xing YZ, Pei JJ, Sun YT, Li SJ, Zhao S, Liu YJ, Li LQ, Hou QJ, Wang DH. [Clinical research of anxiety and depression state among patients suffered from sudden deafness with vertigo]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:1919-1922. [PMID: 29798316 DOI: 10.13201/j.issn.1001-1781.2017.24.012] [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] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Indexed: 11/12/2022]
Abstract
Objective:To offer the objective evidences for the diagnosis by analyzing anxiety and depression among patients with sudden deafness and vertigo and their possible causes. Method:Eighty patients with sudden deafness and vertigo of single ear as the observation group; 80 patients with sudden deafness without vertigo and 60 healthy people as control group.Hamilton anxiety scale (HAMA), Hamilton depression scale (HAMD) are used for quantitative analysis and compare the results of each group score. Result:①The HAMA score of the deafness group with vertigo was significantly higher than that of the group without vertigo and the healthy group (P<0.01). The HAMD score of the deafness group with vertigo was significantly higher than that of the group without vertigo and the healthy group (P<0.01). ②There was correlation between HAMA and sex, age, duration of dizziness, tinnitus, DHI and efficacy grading (P<0.05). There was no correlation between HAMA and the mean hearing threshold, urban and rural distribution, ear fullness (P> 0.05). There was a correlation between HAMD and sex, age, tinnitus, DHI and efficacy grading (P<0.05). There was no correlation between HAMD and the mean hearing threshold, duration of dizziness, urban and rural distribution, ear fullness (P>0.05). Conclusion:There are anxiety and depression in patients with deafness and vertigo. It is mainly related to sex, age, dizziness duration, tinnitus, DHI and grade of efficacy. It is necessary to pay attention to the mental state of patients in clinical treatment. Psychological counseling or treatment can be used to improve clinical efficacy.
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Affiliation(s)
- Y Z Xing
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
| | - J J Pei
- Department of Vascular Surgery, North China University of Science and Technology Affiliated Hospital
| | - Y T Sun
- Psychotic Outpatient Department, the Fifth Hospital of Tangshan
| | - S J Li
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
| | - S Zhao
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
| | - Y J Liu
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
| | - L Q Li
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
| | - Q J Hou
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
| | - D H Wang
- Department of Otolaryngology Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan, 063000, China
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12
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Feng B, Shang J, Wu SH, Chen H, Han Y, Li YQ, Zhang DZ, Zhao LF, Wei SF, Mao Q, Yin CB, Han T, Wang MR, Chen SJ, Li J, Xie Q, Zhen Z, Gao ZL, Zhang YX, Gong GZ, Yang DL, Pan C, Sheng JF, Tang H, Ning Q, Shi GF, Niu JQ, Luo GH, Sun YT, You H, Wang GQ, Zhang LL, Peng J, Zhang Q, Liu JJ, Chen CW, Chen XY, Zhao W, Wang RH, Sun L, Wei L. [Efficacy and safety of pegylated interferon α-2b injection (Y shape, 40 kD) in treatment of patients with genotype 1/6 chronic hepatitis C]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:187-194. [PMID: 28482405 DOI: 10.3760/cma.j.issn.1007-3418.2017.03.006] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Objective: To investigate the efficacy and safety of the new investigational drug pegylated interferon α-2b (Peg-IFN-α-2b) (Y shape, 40 kD) injection (180 µg/week) combined with ribavirin in the treatment of patients with genotype 1/6 chronic hepatitis C (CHC), with standard-dose Peg-IFN-α-2a combined with ribavirin as a positive control. Methods: A multicenter, randomized, open-label, and positive-controlled phase III clinical trial was performed. Eligible patients with genotype 1/6 CHC were screened out and randomly divided into Peg-IFN-α-2b(Y shape, 40kD) group and Peg-IFN-α-2a group at a ratio of 2:1. The patients in both groups were given oral ribavirin for 48 weeks in addition and then followed up for 24 weeks after drug withdrawal. Abbott Real Time HCV Genotype II was used to determine HCV genotype, and Cobas TaqMan quantitative real-time PCR was used to measure HCV RNA level at 0, 4, 12, 24, 48, and 72 weeks. Adverse events were recorded in detail. The primary efficacy endpoint was sustained virological response (SVR), and a non-inferiority test was also performed. Results: A total of 561 patients with genotype 1/6 CHC were enrolled, among whom 529 received treatment; 90.9% of these patients had genotype 1 CHC. The data of the full analysis set showed that SVR rate was 69.80% (95% CI 65.00%-74.60%) in the trial group and 74.16% (95% CI 67.73%-80.59%) in the control group (P = 0.297 0). The data of the per protocol set (PPS) showed that SVR rate was 80.63% (95% CI 76.04%-85.23%) in the trial group and 81.33% (95% CI 75.10%-87.57%) in the control group (P = 0.849 8), and the 95% CI of rate difference conformed to the non-inferiority standard. The analysis of the PPS population showed that of all subjects, 47.9% achieved rapid virologic response, with a positive predictive value of 93.8%. The incidence rate of adverse events was 96.30% in the trial group and 94.94% in the control group, and the incidence rate of serious adverse events was 5.13% in the trail group and 5.06% in the control group. Conclusion: In the regimen of Peg-IFN-α combined with ribavirin for the treatment of genotype 1/6 CHC, the new investigational drug Peg-IFN-α-2b(Y shape, 40 kD) has comparable clinical effect and safety to the control drug Peg-IFN-α-2a.
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Affiliation(s)
- B Feng
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing 100044, China
| | - J Shang
- Department of Infectious Diseases, Henan Provincial People's Hospital, Zhengzhou 450003, China
| | - S H Wu
- Department of Infectious Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - H Chen
- Department of Infectious Diseases, The First Affiliated Hospital of Lanzhou University, Lanzhou 730000, China
| | - Y Han
- Department of Gastroenterology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Y Q Li
- Department of Infectious Diseases, 302 Military Hospital, Beijing 100039, China
| | - D Z Zhang
- Department of Infectious Diseases, Institute for Viral Hepatitis, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China
| | - L F Zhao
- Department of Infectious Diseases, The First Affiliated Hospital of Shanxi University, Taiyuan 030001, China
| | - S F Wei
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China
| | - Q Mao
- Department of Infectious Disease, Southeast Hospital, Third Military Medical University, Chongqing 400038, China
| | - C B Yin
- Department of Infectious Diseases, Guangzhou Eighth People's Hospital, Guangzhou 510060, China
| | - T Han
- Department of Hepatology, Tianjin Third Central Hospital, Tianjin Medical University, Tianjin 300170, China
| | - M R Wang
- Institute of Liver Disease, Nanjing 81 Hospital, Nanjing 210002, China
| | - S J Chen
- Department of Hepatology, Jinan Infectious Disease Hospital, Jinan 250021, China
| | - J Li
- Department of Infectious Diseases, Jiangsu Provincial People's Hospital, Nanjing 210029, China
| | - Q Xie
- Department of Infectious Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Z Zhen
- Department of Infectious Diseases, The Third Affiliated Hospital of Hebei Medical University, Shijiazhuang 050051, China
| | - Z L Gao
- Department of Infectious Diseases, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, China
| | - Y X Zhang
- Department of Infectious Diseases, The First Affiliated Hospital of Xinjiang Medical University, Wulumuqi 830054, China
| | - G Z Gong
- Department of Infectious Diseases, The Second Xiangya Hospital of Central South University, Changsha 410011, China
| | - D L Yang
- Department of Infectious Disease, Institute of Infectious Disease, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - C Pan
- Department of Hepatology, Fuzhou Infectious Disease Hospital, Fuzhou, 350025, China
| | - J F Sheng
- The First Affiliated Hospital of Zhengjiang University, Hangzhou 310003, China
| | - H Tang
- Department of Infectious Diseases, Sichuan University West China Hospital, Chengdu 610041, China
| | - Q Ning
- Department of Infectious Disease, Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - G F Shi
- Department of Infectious Diseases, Huashan Hospital, Shanghai 200040, China
| | - J Q Niu
- Department of Infectious Diseases, The First Affiliated Hospital of Jilin University, Changchun 130062, China
| | - G H Luo
- Department of Infectious Diseases, The First Affiliated Hospital of Guangxi Medical Universtiy, Nanning 530021, China
| | - Y T Sun
- Department of Infectious Diseases, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - H You
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - G Q Wang
- Department of Infectious Diseases, Peking University First Hospital, Beijing 100034, China
| | - L L Zhang
- Department of Infectious Diseases, The First Affiliated Hospital of Nanchang University, Nanchang 360102, China
| | - J Peng
- Department of Infectious Diseases, Nangfang Hospital, Southern Medical University, Guangzhou 510510, China
| | - Q Zhang
- Shanghai Public Health Clinical Center, Fudan University, Shanghai 201508, China
| | - J J Liu
- Department of Infectious Diseases, The First Affiliated Hospital of Xiamen University, Xiamen 361003, China
| | - C W Chen
- Nanjing Military Command Liver Disease Research Center, Shanghai 200000, China
| | - X Y Chen
- Hepatology Department, Youan Hospital, Capital Medical University, Beijing 100069, China
| | - W Zhao
- Department of Hepatology, The Second Affiliated Hospital of the Southeast University, Nanjing 210003, China
| | - R H Wang
- Xiamen Amoytop Biotech Co., Ltd, Xiamen, 361022, China
| | - L Sun
- Xiamen Amoytop Biotech Co., Ltd, Xiamen, 361022, China
| | - L Wei
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing 100044, China
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Abstract
The prediction of the glass-forming ability (GFA) by varying the composition of alloys is a challenging problem in glass physics, as well as a problem for industry, with enormous financial ramifications. Although different empirical guides for the prediction of GFA were established over decades, a comprehensive model or approach that is able to deal with as many variables as possible simultaneously for efficiently predicting good glass formers is still highly desirable. Here, by applying the support vector classification method, we develop models for predicting the GFA of binary metallic alloys from random compositions. The effect of different input descriptors on GFA were evaluated, and the best prediction model was selected, which shows that the information related to liquidus temperatures plays a key role in the GFA of alloys. On the basis of this model, good glass formers can be predicted with high efficiency. The prediction efficiency can be further enhanced by improving larger database and refined input descriptor selection. Our findings suggest that machine learning is very powerful and efficient and has great potential for discovering new metallic glasses with good GFA.
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Affiliation(s)
- Y T Sun
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
- University of Chinese Academy of Science , Beijing 100049, People's Republic of China
| | - H Y Bai
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
- University of Chinese Academy of Science , Beijing 100049, People's Republic of China
| | - M Z Li
- Department of Physics, Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China , Beijing 100872, People's Republic of China
| | - W H Wang
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
- University of Chinese Academy of Science , Beijing 100049, People's Republic of China
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15
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Chen L, Cao CR, Shi JA, Lu Z, Sun YT, Luo P, Gu L, Bai HY, Pan MX, Wang WH. Fast Surface Dynamics of Metallic Glass Enable Superlatticelike Nanostructure Growth. Phys Rev Lett 2017; 118:016101. [PMID: 28106461 DOI: 10.1103/physrevlett.118.016101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Indexed: 06/06/2023]
Abstract
Contrary to the formation of complicated polycrystals induced by general crystallization, a modulated superlatticelike nanostructure, which grows layer by layer from the surface to the interior of a Pd_{40}Ni_{10}Cu_{30}P_{20} metallic glass, is observed via isothermal annealing below the glass transition temperature. The generation of the modulated nanostructure can be solely controlled by the annealing temperature, and it can be understood based on the fast dynamic and liquidlike behavior of the glass surface. The observations have implications for understanding the glassy surface dynamics and pave a way for the controllable fabrication of a unique and sophisticated nanostructure on a glass surface to realize the properties' modification.
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Affiliation(s)
- L Chen
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - C R Cao
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - J A Shi
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Z Lu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Y T Sun
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - P Luo
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - L Gu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - H Y Bai
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - M X Pan
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - W H Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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Sun YT, Wang JQ, Li YZ, Bai HY, Li MZ, Wang WH. Effects of atomic interaction stiffness on low-temperature relaxation of amorphous solids. Phys Chem Chem Phys 2016; 18:26643-26650. [PMID: 27711442 DOI: 10.1039/c6cp04238d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While low-temperature relaxations show significant differences among metallic glasses with different compositions, the underlying mechanism remains mysterious. Using molecular dynamics simulation, low-temperature relaxation of amorphous solids is investigated in model systems with different atomic interaction stiffness. It was found that as the interaction stiffness increases, the low-temperature relaxation is enhanced. The fraction of mobile atoms increases with increasing interaction stiffness, while the length scale of dynamical heterogeneity does not change. The enhanced relaxation may be due to increased dynamical heterogeneity. These findings provide a physical picture for better understanding the origin of low-temperature relaxation dynamics in amorphous solids, and the experimentally observed different β-relaxation behaviors in various metallic glasses.
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Affiliation(s)
- Y T Sun
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - J Q Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. and Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Zhejiang 315201, P. R. China
| | - Y Z Li
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - H Y Bai
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - M Z Li
- Department of Physics, Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, P. R. China.
| | - W H Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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Lu Z, Shang BS, Sun YT, Zhu ZG, Guan PF, Wang WH, Bai HY. Revealing β-relaxation mechanism based on energy distribution of flow units in metallic glass. J Chem Phys 2016; 144:144501. [PMID: 27083732 DOI: 10.1063/1.4945279] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The β-relaxation, which is the source of the dynamics in glass state and has practical significance to relaxation and mechanical properties of glasses, has been an open question for decades. Here, we propose a flow unit perspective to explain the structural origin and evolution of β-relaxation based on experimentally obtained energy distribution of flow units using stress relaxation method under isothermal and linear heating modes. Through the molecular dynamics simulations, we creatively design various artificial metallic glass systems and build a direct relation between β-relaxation behavior and features of flow units. Our results demonstrate that the β-relaxation in metallic glasses originates from flow units and is modulated by the energy distribution of flow units, and the density and distribution of flow units can effectively regulate the β-relaxation behavior. The results provide a better understanding of the structural origin of β-relaxation and also afford a method for designing metallic glasses with obvious β-relaxation and better mechanical properties.
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Affiliation(s)
- Z Lu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - B S Shang
- Beijing Computational Science Research Center, Beijing 100094, China
| | - Y T Sun
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Z G Zhu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - P F Guan
- Beijing Computational Science Research Center, Beijing 100094, China
| | - W H Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H Y Bai
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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Shi HB, Yu K, Luo J, Li J, Tian HB, Zhu JJ, Sun YT, Yao DW, Xu HF, Shi HP, Loor JJ. Adipocyte differentiation-related protein promotes lipid accumulation in goat mammary epithelial cells. J Dairy Sci 2015; 98:6954-64. [PMID: 26298750 DOI: 10.3168/jds.2015-9452] [Citation(s) in RCA: 15] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 05/21/2015] [Indexed: 12/16/2022]
Abstract
Milk fat originates from the secretion of cytosolic lipid droplets (CLD) synthesized within mammary epithelial cells. Adipocyte differentiation-related protein (ADRP; gene symbol PLIN2) is a CLD-binding protein that is crucial for synthesis of mature CLD. Our hypothesis was that ADRP regulates CLD production and metabolism in goat mammary epithelial cells (GMEC) and thus plays a role in determining milk fat content. To understand the role of ADRP in ruminant milk fat metabolism, ADRP (PLIN2) was overexpressed or knocked down in GMEC using an adenovirus system. Immunocytochemical staining revealed that ADRP localized to the surface of CLD. Supplementation with oleic acid (OA) enhanced its colocalization with CLD surface and enhanced lipid accumulation. Overexpression of ADRP increased lipid accumulation and the concentration of triacylglycerol in GMEC. In contrast, morphological examination revealed that knockdown of ADRP decreased lipid accumulation even when OA was supplemented. This response was confirmed by the reduction in mass of cellular TG when ADRP was knocked down. The fact that knockdown of ADRP did not completely eliminate lipid accumulation at a morphological level in GMEC without OA suggests that some other compensatory factors may also aid in the process of CLD formation. The ADRP reversed the decrease of CLD accumulation induced by adipose triglyceride lipase. This is highly suggestive of ADRP promoting triacylglycerol stability within CLD by preventing access to adipose triglyceride lipase. Collectively, these data provide direct in vitro evidence that ADRP plays a key role in CLD formation and stability in GMEC.
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Affiliation(s)
- H B Shi
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100; College of Life Science, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, P. R. China 310018
| | - K Yu
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - J Luo
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100.
| | - J Li
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - H B Tian
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - J J Zhu
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - Y T Sun
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - D W Yao
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - H F Xu
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - H P Shi
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P.R. China 712100
| | - J J Loor
- Mammalian NutriPhysioGenomics, Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana 61801.
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Zhang X, Tang H, Sun YT, Liu X, Tan WS, Fan L. Elucidating the effects of arginine and lysine on a monoclonal antibody C-terminal lysine variation in CHO cell cultures. Appl Microbiol Biotechnol 2015; 99:6643-52. [DOI: 10.1007/s00253-015-6617-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 04/11/2015] [Accepted: 04/15/2015] [Indexed: 11/24/2022]
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Zhu JJ, Luo J, Sun YT, Shi HB, Li J, Wu M, Yu K, Haile AB, Loor JJ. Short communication: Effect of inhibition of fatty acid synthase on triglyceride accumulation and effect on lipid metabolism genes in goat mammary epithelial cells. J Dairy Sci 2015; 98:3485-91. [PMID: 25726120 DOI: 10.3168/jds.2014-8202] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 01/12/2015] [Indexed: 01/12/2023]
Abstract
The role of fatty acid synthase (FASN) on de novo fatty acid synthesis has been well established. In monogastrics, unlike acetyl-coenzyme A carboxylase, FASN is primarily controlled at the transcriptional level. However, no data exist on ruminant mammary cells evaluating effects of FASN knockdown on mRNA expression of lipogenic genes. Inhibition of FASN in mammary cells by C75-mediated interference, a synthetic inhibitor of FASN activity, and short hairpin RNA-mediated interference markedly reduced cellular triglyceride content at least in part by decreasing the expression of genes related to triglyceride synthesis (GPAT, AGPAT6, and DGAT2) and enhancing the expression of lipolysis-related genes (ATGL and HSL). Consistent with the markedly lower expression of genes related to lipid droplet formation and secretion (TIP47, ADFP, BTN1A1, and XDH), cellular lipid droplets also were reduced sharply after incubation with C75 or adenovirus-short-hairpin-RNA. The results underscored the essential role of FASN in the overall process of milk-fat formation in goat mammary epithelial cells.
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Affiliation(s)
- J J Zhu
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - J Luo
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100.
| | - Y T Sun
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - H B Shi
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - J Li
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - M Wu
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - K Yu
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - A B Haile
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, P. R. China 712100
| | - J J Loor
- Mammalian NutriPhysioGenomics, Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana 61801
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Zhao N, Li ZL, Li DH, Sun YT, Shan DT, Bai J, Pei YH, Jing YK, Hua HM. Quinolone and indole alkaloids from the fruits of Euodia rutaecarpa and their cytotoxicity against two human cancer cell lines. Phytochemistry 2015; 109:133-139. [PMID: 25457491 DOI: 10.1016/j.phytochem.2014.10.020] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/11/2014] [Accepted: 10/16/2014] [Indexed: 06/04/2023]
Abstract
Four quinolone alkaloids (1-4) and three indole alkaloids (20-22), together with 30 known alkaloids (5-19, 23-37), were isolated from the fruits of Euodia rutaecarpa. Their structures were established by spectroscopic analyses. The in vitro cytotoxic activities of these alkaloids against leukaemia HL-60 and prostate cancer PC-3 cell lines were evaluated.
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Affiliation(s)
- Nan Zhao
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Zhan-Lin Li
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
| | - Da-Hong Li
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Ya-Ting Sun
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Dong-Ting Shan
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Jiao Bai
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Yue-Hu Pei
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Yong-Kui Jing
- Department of Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA
| | - Hui-Ming Hua
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
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Ding DW, Yi J, Liu GL, Sun YT, Zhao DQ, Pan MX, Bai HY, Wang WH. The equipment for the preparation of micro and nanoscale metallic glassy fibers. Rev Sci Instrum 2014; 85:103907. [PMID: 25362416 DOI: 10.1063/1.4898018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A supercooled liquid extraction method and apparatus for micro and nanoscale metallic glassy fiber preparation was developed. Using the fiber fabrication equipment, micro to nanoscale metallic glassy fibers with diameter ranging from 70 nm to 300 μm can be obtained by wire drawing in the supercooled liquid region of metallic glasses via superplastic deformation. The obtained metallic glassy fibers possess precisely designed and controlled sizes, high structural uniformity and high degree of surface smoothness.
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Affiliation(s)
- D W Ding
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - J Yi
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - G L Liu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Y T Sun
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - D Q Zhao
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - M X Pan
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H Y Bai
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - W H Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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23
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Sun YT, Zhao L, Ye ZY, Fan L, Liu XP, Tan WS. An investigation into the relationship between metabolic responses and energy regulation in antibody-producing cell. J Microbiol Biotechnol 2013; 23:1586-97. [PMID: 23949330 DOI: 10.4014/jmb.1307.07019] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Energy-efficient metabolic responses were often noted in high-productive cultures. To better understand these metabolic responses, an investigation into the relationship between metabolic responses and energy regulation was conducted via a comparative analysis among cultures with different energy source supplies. Both glycolysis and glutaminolysis were studied through the kinetic analyses of major extracellular metabolites concerning the fast and slow cell growth stages, respectively, as well as the time-course profiles of intracellular metabolites. In three cultures showing distinct antibody productivities, the amino acid metabolism and energy state were further examined. Both the transition of lactate from production to consumption and steady intracellular pools of pyruvate and lactate were observed to be correlated with efficient energy regulation. In addition, an efficient utilization of amino acids as the replenishment for the TCA cycle was also found in the cultures with upregulated energy metabolism. It was further revealed that the inefficient energy regulation would cause low cell productivity based on the comparative analysis of cell growth and productivity in cultures having distinct energy regulation.
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Affiliation(s)
- Ya-Ting Sun
- The State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
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Xu JJ, Xiao B, Sun YT, Hu HZ. Polymorphism data at two STR loci in Chinese population. J Forensic Sci 2005; 50:707. [PMID: 15932112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Affiliation(s)
- J J Xu
- Department of Medical Biology, Life Science College, Sichuan University, Chengdu 610041, Sichuan, P R China
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25
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Chen CC, Sun YT, Chen JJ, Chang YJ. Tumor necrosis factor-alpha-induced cyclooxygenase-2 expression via sequential activation of ceramide-dependent mitogen-activated protein kinases, and IkappaB kinase 1/2 in human alveolar epithelial cells. Mol Pharmacol 2001; 59:493-500. [PMID: 11179444 DOI: 10.1124/mol.59.3.493] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The role of p44/42 mitogen-activated protein kinase (MAPK), p38, and c-Jun NH(2)-terminal kinase (JNK) in tumor necrosis factor (TNF)-alpha-induced cyclooxygenase (COX)-2 expression was studied in NCI-H292 epithelial cells. TNF-alpha-mediated COX-2 expression and COX-2 promoter activity were inhibited by the MAPK kinase inhibitor PD98059 or the p38 inhibitor SB203580. Treatment of cells for 10 min with TNF-alpha resulted in activation of p44/42 MAPK, p38, and JNK. C2-ceramide (a cell-permeable ceramide analog), bacterial neutral sphingomyelinase (Smase; an enzyme that degrades sphingomyelin to ceramide), and N-oleoylethanolamine (a ceramidase inhibitor) all induced activation of MAPKs, COX-2 expression, nuclear factor (NF)-kappaB DNA-protein binding, and COX-2 promoter activity. The inactive analog, dihydro-C2-ceramide, had no effect. SMase- or C2-ceramide-induced COX-2 expression and COX-2 promoter activity were also inhibited by PD98059 or SB203580. Glutathione, a neutral SMase inhibitor, attenuated TNF-alpha- or SMase-induced activation of MAPKs, COX-2 expression, and COX-2 promoter activity. TNF-alpha- or C2-ceramide-induced COX-2 promoter activity was inhibited by the dominant negative mutant of extracellular signal-regulated kinase 2, p38, JNK, IkappaB kinase (IKK)1, or IKK2. IKK activity was stimulated by either TNF-alpha or C2-ceramide, and these effects were inhibited by PD98059 or SB203580. All these results suggest that, in NCI-H292 epithelial cells, activation of MAPKs by ceramide contributes to the TNF-alpha signaling that occurs downstream of neutral SMase activation and results in the stimulation of IKK1/2, and NF-kappaB in the COX-2 promoter, followed by initiation of COX-2 expression.
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Affiliation(s)
- C C Chen
- Department of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan
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Chen CC, Sun YT, Chen JJ, Chiu KT. TNF-alpha-induced cyclooxygenase-2 expression in human lung epithelial cells: involvement of the phospholipase C-gamma 2, protein kinase C-alpha, tyrosine kinase, NF-kappa B-inducing kinase, and I-kappa B kinase 1/2 pathway. J Immunol 2000; 165:2719-28. [PMID: 10946303 DOI: 10.4049/jimmunol.165.5.2719] [Citation(s) in RCA: 161] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
TNF-alpha induced a dose- and time-dependent increase in cyclooxygenase-2 (COX-2) expression and PGE2 formation in human NCI-H292 epithelial cells. Immunofluorescence staining demonstrated that COX-2 was expressed in cytosol and nuclear envelope. Tyrosine kinase inhibitors (genistein or herbimycin) or phosphoinositide-specific phospholipase C inhibitor (U73122) blocked TNF-alpha-induced COX-2 expression. TNF-alpha also stimulated phosphatidylinositol hydrolysis and protein kinase C (PKC) activity, and both were abolished by genistein or U73122. The PKC inhibitor, staurosporine, also inhibited TNF-alpha-induced response. The 12-O-tetradecanoylphorbol 13-acetate (TPA), a PKC activator, also stimulated COX-2 expression, this effect being inhibited by genistein or herbimycin. NF-kappaB DNA-protein binding and COX-2 promoter activity were enhanced by TNF-alpha, and these effects were inhibited by genistein, U73122, staurosporine, or pyrolidine dithiocarbamate. TPA stimulated both NF-kappaB DNA-protein binding and COX-2 promoter activity, these effects being inhibited by genistein, herbimycin, or pyrolidine dithiocarbamate. The TNF-alpha-induced, but not the TPA-induced, COX-2 promoter activity was inhibited by phospholipase C-gamma2 mutants, and the COX-2 promoter activity induced by either agent was attenuated by dominant-negative mutants of PKC-alpha, NF-kappaB-inducing kinase, or I-kappaB (inhibitory protein that dissociates from NF-kappaB) kinase (IKK)1 or 2. IKK activity was stimulated by both TNF-alpha and TPA, and these effects were inhibited by staurosporine or herbimycin. These results suggest that, in NCI-H292 epithelial cells, TNF-alpha might activate phospholipase C-gamma2 via an upstream tyrosine kinase to induce activation of PKC-alpha and protein tyrosine kinase, resulting in the activation of NF-kappaB-inducing kinase and IKK1/2, and NF-kappaB in the COX-2 promoter, then initiation of COX-2 expression and PGE2 release.
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Affiliation(s)
- C C Chen
- Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan.
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Wang SX, Sun YT, Sui SF. Membrane-induced conformational change in human apolipoprotein H. Biochem J 2000; 348 Pt 1:103-6. [PMID: 10794719 PMCID: PMC1221041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The interaction of apolipoprotein H (Apo H) with lipid membrane has been considered to be a basic mechanism for the biological function of the protein. Previous reports have demonstrated that Apo H can interact only with membranes containing anionic phospholipids. Here we study the membrane-induced conformational change of Apo H by CD spectroscopy with two different model systems: anionic-phospholipid-containing liposomes [such as 1, 2-dimyristoyl-sn-glycero-3-phosphoglycerol (DMPG) and cardiolipin], and the water/methanol mixtures at moderately low pH, which mimic the micro-physicochemical environment near the membrane surface. It is found that Apo H undergoes a remarkable conformational change on interaction with liposomes containing anionic phospholipid. To interact with liposomes containing DMPG, there is a 6.8% increase in alpha-helix in the secondary structures; in liposomes containing cardiolipin, however, there is a 12.6% increase in alpha-helix and a 9% decrease in beta-sheet. The similar conformation change in Apo H can be induced by treatment with an appropriate mixture of water/methanol. The results indicate that the association of Apo H with membrane is correlated with a certain conformational change in the secondary structure of the protein.
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Affiliation(s)
- S X Wang
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane, Tsinghua University, Beijing 100084, People's Republic of China
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Chen CC, Chiu KT, Sun YT, Chen WC. Role of the cyclic AMP-protein kinase A pathway in lipopolysaccharide-induced nitric oxide synthase expression in RAW 264.7 macrophages. Involvement of cyclooxygenase-2. J Biol Chem 1999; 274:31559-64. [PMID: 10531359 DOI: 10.1074/jbc.274.44.31559] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.6] [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: 11/06/2022] Open
Abstract
The signaling pathway for lipopolysaccharide (LPS)-induced nitric oxide (NO) release in RAW 264.7 macrophages involves the protein kinase C and p38 activation pathways (Chen, C. C., Wang, J. K., and Lin, S. B. (1998) J. Immunol. 161, 6206-6214; Chen, C. C., and Wang, J. K. (1999) Mol. Pharmacol. 55, 481-488). In this study, the role of the cAMP-dependent protein kinase A (PKA) pathway was investigated. The PKA inhibitors, KT-5720 and H8, reduced LPS-induced NO release and inducible nitric oxide synthase (iNOS) expression. The direct PKA activator, Bt(2)cAMP, caused concentration-dependent NO release and iNOS expression, as confirmed by immunofluorescence studies. The intracellular cAMP concentration did not increase until after 6 h of LPS treatment. Two cAMP-elevating agents, forskolin and cholera toxin, potentiated the LPS-induced NO release and iNOS expression. Stimulation of cells with LPS or Bt(2)cAMP for periods of 10 min to 24 h caused nuclear factor-kappaB (NF-kappaB) activation in the nuclei, as shown by detection of NF-kappaB-specific DNA-protein binding. The PKA inhibitor, H8, inhibited the NF-kappaB activation induced by 6- or 12-h treatment with LPS but not that induced after 1, 3, or 24 h. The cyclooxygenase-2 (COX-2) inhibitors, NS-398 and indomethacin, attenuated LPS-induced NO release, iNOS expression, and NF-kappaB DNA-protein complex formation. LPS induced COX-2 expression in a time-dependent manner, and prostaglandin E(2) production was induced in parallel. These results suggest that 6 h of treatment with LPS increases intracellular cAMP levels via COX-2 induction and prostaglandin E(2) production, resulting in PKA activation, NF-kappaB activation, iNOS expression, and NO production.
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Affiliation(s)
- C C Chen
- Department of Pharmacology, College of Medicine, National Taiwan University, Taipei 10018, Taiwan
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Abstract
The interaction of rabbit C-reactive protein (rCRP) with a supported monolayer containing a phosphorylcholine moiety was studied. Three types of phospholipids were synthesized, each containing a insertion spacer of eight, six, or three atoms between the phosphorylcholine group and hydrophobic tail. By varying the length of the insertion spacer, we can vary the extension of the phosphorylcholine group from the membrane surface. By varying the monolayer composition, we can control the lateral distance between the exposed phosphorylcholine groups. Using the surface plasmon resonance technique (SPR), we demonstrated that the calcium-dependent binding of rCRP to the model membrane is governed not only by the ability of the ligand to access the binding pocket fully (spacer length), but also by lateral hindrance within the two-dimensional plane of the membrane. The value of the apparent binding constant was estimated by theoretical analysis, which is obviously dependent on the composition of the lipid mixture, and a maximum of (9.9 +/- 1.5) x 10(6) M-1 was obtained.
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Affiliation(s)
- S F Sui
- Biophysics Group, State Key Laboratory of Biomembrane, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, People's Republic of
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Sun YT, Wreford NG, Robertson DM, de Kretser DM. Quantitative cytological studies of spermatogenesis in intact and hypophysectomized rats: identification of androgen-dependent stages. Endocrinology 1990; 127:1215-23. [PMID: 2117524 DOI: 10.1210/endo-127-3-1215] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A stereological study of the numbers of germ cells in various stages of spermatogenesis was undertaken in testosterone-treated intact and hypophysectomized (HPX) rats. Adult Sprague-Dawley rats were given testosterone by Silastic implants, which either inhibited (3-cm length) or partially maintained (10 cm) spermatogenesis over a 13-week period. The numbers of nuclei of the various germ cell categories (spermatogonia, spermatocytes, and round spermatids) in the testes were estimated by profile counting and measurement of nuclear diameter. The numbers of elongated spermatids were determined separately in testicular homogenates. Testis weight, seminiferous tubule volume, and tubule diameter were significantly decreased in intact rats with 3- and 10-cm testosterone implants and in HPX rats, although they were partially maintained in groups with 10-cm implants compared to those in groups with 3-cm implants (P less than 0.05). The effect of 3-cm testosterone implants in the intact group was to suppress the number of spermatogonia to 57%, reduce the conversion of spermatogonia to spermatocytes to 85%, and reduce the conversion of round to elongated spermatids to 19% of the control value. This latter effect was largely overcome with 10-cm testosterone implants. In HPX rats, only 10-cm implants were effective in maintaining the conversion of round spermatids to elongated spermatids. However, testosterone alone was less effective in maintaining the conversion of spermatocytes to round spermatids, suggesting that a pituitary factor, probably FSH, was involved. It is concluded that testosterone has a major effect on the conversion of round to elongated spermatids. The conversion of spermatogonia to spermatocytes and the conversion of spermatocytes to round spermatids depend on the synergistic action of both FSH and testosterone. However, the effect of FSH is greatest on the conversion of spermatocytes to spermatids, i.e. meiosis.
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Affiliation(s)
- Y T Sun
- Department of Anatomy, Monash University, Clayton, Victoria, Australia
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Sun YT, Robertson DM, Gonzales G, Risbridger GP, de Kretser DM. Effect of testosterone on serum immunoactive inhibin concentrations in intact and hypophysectomized male rats. J Reprod Fertil 1989; 87:795-801. [PMID: 2513397 DOI: 10.1530/jrf.0.0870795] [Citation(s) in RCA: 4] [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: 01/01/2023]
Abstract
Intact and hypophysectomized rats were treated with graded doses of testosterone via subcutaneous Silastic implants over a 13-week period. Serum inhibin concentrations fell 50% (P less than 0.001) after 2 weeks of hypophysectomy, remaining suppressed at this level for 13 weeks. The administration of testosterone to hypophysectomized rats (serum testosterone values 2-12 ng/ml; control values 5.5 ng/ml) was without effect on serum inhibin values. In contrast, administration of testosterone to intact animals for 7 weeks resulted in an initial fall (P less than 0.05) in inhibin levels to 50-70% of controls then increasing to reach control levels at higher doses. Serum FSH concentrations were similarly biphasic with increasing dose of testosterone and values for these two hormones were significantly correlated (r = 0.44, P less than 0.01). Segments of seminiferous tubules in culture from rats after various times of hypophysectomy showed a partly suppressed secretion of inhibin. The administration of testosterone did not modify inhibin production although inhibin production was sensitive to FSH. It is concluded that (1) serum inhibin concentrations are partly suppressed after hypophysectomy and testosterone has no effect on serum inhibin values; and (2) the suppression of serum inhibin in intact rats treated with increasing doses of testosterone is attributable to the concomitant fall in serum FSH concentrations.
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Affiliation(s)
- Y T Sun
- Department of Anatomy, Monash University, Clayton, Victoria, Australia
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Abstract
The effects of exogenously administered testosterone on the maintenance of spermatogenesis in intact and hypophysectomized rats were examined. Adult male rats were given Silastic implants containing testosterone in lengths ranging from 0.5-20 cm, and their effects on daily sperm production (DSP); serum FSH, LH, and testosterone; and interstitial fluid testosterone were determined in intact and hypophysectomized rats over a 13-week period. In intact rats, DSP levels were suppressed to 4-30% of control values at lower testosterone doses (2- to 6-cm implants), while DSP levels were partially maintained (65-93%) at higher doses (greater than or equal to 8 cm implants). Under these conditions LH levels were suppressed while FSH levels were reduced to 30-60% of control values. A steep testosterone-induced change in DSP levels was observed in both intact (2- to 3-fold) and hypophysectomized (18-fold) animals over a narrow testosterone dose range (implant lengths, 6-8 cm). Interstitial fluid testosterone levels associated with this change in DSP levels range from 6-8% of control values, while serum testosterone levels were elevated 1- to 2-fold above control values. A comparison of the testosterone implant lengths that caused a 50% change in DSP levels after 7 weeks of treatment was similar in intact and hypophysectomized rats. At high testosterone doses (greater than or equal to 10-cm implants), maximal DSP levels decreased 10% by 7 weeks and 35% by 13 weeks. DSP and serum testosterone levels were highly correlated (r = 0.54-0.83), while DSP and interstitial fluid testosterone showed a less correlation (r = 0.36-0.70) under the various experimental conditions examined. In conclusion, the testosterone-induced maintenance of DSP in rats is associated with several dose-related responses or events that appear to be differentially regulated. At low testosterone concentrations, DSP levels are partially maintained in intact rats but are totally suppressed in hypophysectomised rats, suggesting that a pituitary factor, probably FSH, has a potentiating effect at these testosterone concentrations. At intermediate testosterone doses resulting in the testosterone-induced maintenance of DSP, the similarity of dose-response curves (ED50 and maximum response) in intact and hypophysectomised rats would suggest that pituitary hormones are not required for this aspect of the process. The observation that the maintenance of DSP by testosterone under some experimental conditions is poorly correlated with interstitial fluid testosterone levels raises questions as to the mechanisms by which testosterone acts to stimulate spermatogenesis.
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Affiliation(s)
- Y T Sun
- Department of Anatomy, Monash University, Clayton, Victoria, Australia
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Tang MY, Sun YT, Liu TH. Ultrastructure of trophoblast of hydatidiform mole. Chin Med J (Engl) 1988; 101:608-14. [PMID: 3148402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Liang B, Gao GH, Tian HB, Liu HF, Xu XQ, Yang JX, Hou W, Yang SL, Sun YT, Duan Y. Treatment of acute aplastic anemia by traditional Chinese medicine combined with Western drugs. J TRADIT CHIN MED 1988; 8:25-6. [PMID: 3393016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Chang JJ, Zhang GJ, Han XC, Sun YT. Relationship between Raman spectroscopic lines and growth of Rhizobium japonicum. Cell Biophys 1987; 10:205-15. [PMID: 2446767 DOI: 10.1007/bf02797341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The Raman spectroscopic lines of liquid cultures of Rhizobium japonicum have been compared with electron microscopic examinations and growth measurements of these cells. The results showed that the significant Raman lines are related to the reproduction activities of the procaryotic cells.
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Affiliation(s)
- J J Chang
- Institute of Biophysics, Academia sinica, Beijing, China
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Zhu ML, Sun YT. [Advances on the relation between the metabolism and lipids and coronary diseases]. Zhonghua Xin Xue Guan Bing Za Zhi 1985; 13:225-7. [PMID: 3912149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Zu PD, Sun YT, Cheng J, Tian L, Dang MY, Han ML. Electron microscopic observations of the effects of gossypol on the human endometrium. Am J Obstet Gynecol 1984; 149:780-7. [PMID: 6465231 DOI: 10.1016/0002-9378(84)90122-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Gossypol treatment of endometriosis and uterine myomas in 15 cases was started with a daily dose of 20 mg of gossypol-acetic acid twice a day for 20 days as a loading dose, followed by 40 mg (20 mg twice weekly). A maintenance dose of 20 mg was given weekly. The total course of treatment lasted about 6 months. Light and electron microscopic examination of the endometrium was carried out before treatment and 2, 3, 4, and 6 months after gossypol treatment. After gossypol treatment three different characteristics of the endometrium were noted: (1) irregular secretory activity, (2) proliferative activity, and (3) atrophy. On electron microscopic examination it was shown that there were important changes of the organelles, indicating suppressed secretory activity. Based on the above results, the nature and significance of the ultrastructural changes of the endometrium induced by gossypol were analyzed and the possibility of developing a new field of research in female contraception with gossypol was considered.
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