1
|
Zang Z, Li Y, Chou S, Tian J, Si X, Wang Y, Tan H, Gao N, Shu C, Li D, Chen W, Chen Y, Wang L, He Y, Li B. Polyphenol nanoparticles based on bioresponse for the delivery of anthocyanins. Food Res Int 2024; 184:114222. [PMID: 38609214 DOI: 10.1016/j.foodres.2024.114222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 03/07/2024] [Accepted: 03/11/2024] [Indexed: 04/14/2024]
Abstract
Anthocyanin (AN) has good antioxidant and anti-inflammatory bioactivities, but its poor biocompatibility and low stability limit the application of AN in the food industry. In this study, core-shell structured carriers were constructed by noncovalent interaction using tannic acid (TA) and poloxamer 188 (F68) to improve the biocompatibility, stability and smart response of AN. Under different treatment conditions, TA-F68 and AN were mainly bound by hydrophobic interaction. The PDI is less than 0.1, and the particle size of nanoparticles (NPs) is uniform and concentrated. The retention of the complex was 15.50 % higher than that of AN alone after 9 d of light treatment. After heat treatment for 180 min, the retention rate after loading was 13.87 % higher than that of AN alone. The carrier reduce the damage of AN by the digestive environment, and intelligently and sustainedly release AN when the esterase is highly expressed. In vitro studies demonstrated that the nanocarriers had good biocompatibility and significantly inhibited the overproduction of reactive oxygen species induced by oxidative stress. In addition, AN-TA-F68 has great potential for free radical scavenging at sites of inflammation. In conclusion, the constructed nano-delivery system provides a potential application for oral ingestion of bioactive substances for intervention in ulcerative colitis.
Collapse
Affiliation(s)
- Zhihuan Zang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yuan Li
- China Agricultural university. Beijing 311800, China
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Jinlong Tian
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xu Si
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yuehua Wang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Hui Tan
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Ningxuan Gao
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Chi Shu
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Dongnan Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Wei Chen
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Yi Chen
- Nanchang University, State Key Laboratory of Food Science and Technology, Nanchang, Jiangxi 330031, China
| | - Liang Wang
- Zhejiang Lanmei Technology Co., Ltd. Zhuji, Zhejiang 311800, China
| | - Ying He
- Zhejiang Lanmei Technology Co., Ltd. Zhuji, Zhejiang 311800, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
| |
Collapse
|
2
|
Zang Z, Tian J, Chou S, Lang Y, Tang S, Yang S, Yang Y, Jin Z, Chen W, Liu X, Huang W, Li B. Investigation on the interaction mechanisms for stability of preheated whey protein isolate with anthocyanins from blueberry. Int J Biol Macromol 2024; 255:127880. [PMID: 37944731 DOI: 10.1016/j.ijbiomac.2023.127880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 10/24/2023] [Accepted: 11/02/2023] [Indexed: 11/12/2023]
Abstract
Proteins and anthocyanins coexist in complex food systems. This research mainly studied the steady-state protective design and mechanism of the preheated protein against anthocyanins. Multispectral and molecular dynamics are utilized to illustrate the interaction mechanism between preheated whey protein isolate (pre-WPI) and anthocyanins. The pre-WPI could effectively protect the stability of anthocyanins, and the effect was better than that of the natural whey protein isolate (NW). Among them, NW after preheating treatment at 55 °C showed better protection against anthocyanin stability. Fluorescence studies indicated that pre-WPI there existed a solid binding affinity and static quenching for malvidin-3-galactoside (M3G). Multispectral data showed a significant variation in the secondary structure of pre-WPI. Furthermore, molecular dynamics simulation selects AMBER18 as the protein force field, and the results showed that hydrogen bonding participated as an applied force. Compared with NW, pre-WPI could better wrap anthocyanins and avoid damage to the external environment due to tightening of the pockets. Protein protects anthocyanins from degradation, and this protective effect is influenced by the preheating temperature of protein and the structure of protein. On the basis of the above results, it is possible to pinpoint the interaction mechanism between preheated proteins and anthocyanins.
Collapse
Affiliation(s)
- Zhihuan Zang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Jinlong Tian
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yuxi Lang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Siyi Tang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Shufang Yang
- Zhejiang Lanmei Technology Co., Ltd. Zhuji, Zhejiang 311800, China
| | - Yiyun Yang
- Zhejiang Lanmei Technology Co., Ltd. Zhuji, Zhejiang 311800, China
| | - Zhufeng Jin
- Zhejiang Lanmei Technology Co., Ltd. Zhuji, Zhejiang 311800, China
| | - Wei Chen
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Xiaoli Liu
- Jiangsu Academy of Agricultural Sciences, Institution of Argo-product Processing, Nanjing 210014, China
| | - Wuyang Huang
- Jiangsu Academy of Agricultural Sciences, Institution of Argo-product Processing, Nanjing 210014, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
| |
Collapse
|
3
|
Zang Z, Tang S, Li Z, Chou S, Shu C, Chen Y, Chen W, Yang S, Yang Y, Tian J, Li B. Front Cover: Cover Image, Volume 21, Issue 5. Compr Rev Food Sci Food Saf 2022. [DOI: 10.1111/1541-4337.13044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
4
|
Zang Z, Tang S, Li Z, Chou S, Shu C, Chen Y, Chen W, Yang S, Yang Y, Tian J, Li B. An updated review on the stability of anthocyanins regarding the interaction with food proteins and polysaccharides. Compr Rev Food Sci Food Saf 2022; 21:4378-4401. [PMID: 36018502 DOI: 10.1111/1541-4337.13026] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [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: 04/06/2022] [Revised: 07/18/2022] [Accepted: 07/26/2022] [Indexed: 01/28/2023]
Abstract
The health benefits of anthocyanins are compromised by their chemical instability and susceptibility to external stress. Researchers found that the interaction between anthocyanins and macromolecular components such as proteins and polysaccharides substantially determines the stability of anthocyanins during food processing and storage. The topic thus has attracted much attention in recent years. This review underlines the new insights gained in our current study of physical and chemical properties and functional properties in complex food systems. It examines the interaction between anthocyanins and food proteins or polysaccharides by focusing on the "structure-stability" relationship. Furthermore, multispectral and molecular computing simulations are used as the chief instruments to explore the interaction's mechanism. During processing and storage, the stability of anthocyanins is generally influenced by the adverse characteristics of food and beverage, including temperature, light, oxygen, enzymes, pH. While the action modes and types between protein/polysaccharide and anthocyanins mainly depend on their structures, the noncovalent interaction between them is the key intermolecular force that increases the stability of anthocyanins. Our goal is to provide the latest understanding of the stability of anthocyanins under food processing conditions and further improve their utilization in food industries. Practical Application: This review provides support for the steady-state protection of active substances.
Collapse
Affiliation(s)
- Zhihuan Zang
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| | - Siyi Tang
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| | - Zhiying Li
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| | - Chi Shu
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| | - Yi Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Wei Chen
- Faculty of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
| | - Shufang Yang
- Zhejiang Lanmei Technology Co., Ltd., Zhuji, China
| | - Yiyun Yang
- Zhejiang Lanmei Technology Co., Ltd., Zhuji, China
| | - Jinlong Tian
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, China
| |
Collapse
|
5
|
Umano A, Fang K, Qu Z, Scaglione JB, Altinok S, Treadway CJ, Wick ET, Paulakonis E, Karunanayake C, Chou S, Bardakjian TM, Gonzalez-Alegre P, Page RC, Schisler JC, Brown NG, Yan D, Scaglione KM. The molecular basis of spinocerebellar ataxia type 48 caused by a de novo mutation in the ubiquitin ligase CHIP. J Biol Chem 2022; 298:101899. [PMID: 35398354 PMCID: PMC9097460 DOI: 10.1016/j.jbc.2022.101899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/24/2022] [Accepted: 03/28/2022] [Indexed: 11/25/2022] Open
Abstract
The spinocerebellar ataxias (SCAs) are a class of incurable diseases characterized by degeneration of the cerebellum that results in movement disorder. Recently, a new heritable form of SCA, spinocerebellar ataxia type 48 (SCA48), was attributed to dominant mutations in STIP1 homology and U box-containing 1 (STUB1); however, little is known about how these mutations cause SCA48. STUB1 encodes for the protein C terminus of Hsc70 interacting protein (CHIP), an E3 ubiquitin ligase. CHIP is known to regulate proteostasis by recruiting chaperones via a N-terminal tetratricopeptide repeat domain and recruiting E2 ubiquitin-conjugating enzymes via a C-terminal U-box domain. These interactions allow CHIP to mediate the ubiquitination of chaperone-bound, misfolded proteins to promote their degradation via the proteasome. Here we have identified a novel, de novo mutation in STUB1 in a patient with SCA48 encoding for an A52G point mutation in the tetratricopeptide repeat domain of CHIP. Utilizing an array of biophysical, biochemical, and cellular assays, we demonstrate that the CHIPA52G point mutant retains E3-ligase activity but has decreased affinity for chaperones. We further show that this mutant decreases cellular fitness in response to certain cellular stressors and induces neurodegeneration in a transgenic Caenorhabditis elegans model of SCA48. Together, our data identify the A52G mutant as a cause of SCA48 and provide molecular insight into how mutations in STUB1 cause SCA48.
Collapse
Affiliation(s)
- A Umano
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA
| | - K Fang
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA
| | - Z Qu
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA
| | - J B Scaglione
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA
| | - S Altinok
- Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - C J Treadway
- Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA; Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - E T Wick
- Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA; Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - E Paulakonis
- Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA; Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - C Karunanayake
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, USA
| | - S Chou
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA; Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - T M Bardakjian
- Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - P Gonzalez-Alegre
- Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - R C Page
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, USA
| | - J C Schisler
- Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - N G Brown
- Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA; Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - D Yan
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA
| | - K M Scaglione
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA; Department of Neurology, Duke University, Durham, North Carolina, USA; Duke Center for Neurodegeneration and Neurotherapeutics, Duke University, Durham, North Carolina, USA.
| |
Collapse
|
6
|
Zang Z, Chou S, Si X, Cui H, Tan H, Ding Y, Liu Z, Wang H, Lang Y, Tang S, Li B, Tian J. Effect of bovine serum albumin on the stability and antioxidant activity of blueberry anthocyanins during processing and in vitro simulated digestion. Food Chem 2022; 373:131496. [PMID: 34836668 DOI: 10.1016/j.foodchem.2021.131496] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 11/04/2022]
Abstract
The application of blueberry anthocyanins (ANs) was limited due to their low in-process stability and bioavailability. In our study, the stability and antioxidant capacity of ANs before and after adding bovine serum albumin (BSA) were examined by simulating various processing, storage (light, sucrose, and vitamin C (Vc)), and in vitro simulated digestion parameters. For this purpose, pH-differential method, high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS), peroxyl scavenging capacity assay, and cellular antioxidant assay were conducted. BSA at different concentrations, specifically at 0.15 mg/mL, inhibited the degradation of ANs and the loss of antioxidant capacity. The results suggest that BSA has a positive effect on ANs.
Collapse
Affiliation(s)
- Zhihuan Zang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xu Si
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Huijun Cui
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Hui Tan
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yumeng Ding
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Ziyue Liu
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Haotian Wang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yuxi Lang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Siyi Tang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Jinlong Tian
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
| |
Collapse
|
7
|
Zang Z, Chou S, Geng L, Si X, Ding Y, Lang Y, Cui H, Gao N, Chen Y, Wang M, Xie X, Xue B, Li B, Tian J. Interactions of blueberry anthocyanins with whey protein isolate and bovine serum protein: Color stability, antioxidant activity, in vitro simulation, and protein functionality. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.112269] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
8
|
Truong K, Venning V, Wain T, Chou S, Fernandez-Peñas P. Successful treatment of highly refractory necrobiotic xanthogranuloma with peginterferon alfa-2a. Clin Exp Dermatol 2021; 46:731-733. [PMID: 33222242 DOI: 10.1111/ced.14523] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2020] [Indexed: 11/30/2022]
Affiliation(s)
- K Truong
- Departments of, Department of, Dermatology, Westmead Hospital, Sydney, NSW, Australia
| | - V Venning
- Departments of, Department of, Dermatology, Westmead Hospital, Sydney, NSW, Australia
| | - T Wain
- Departments of, Department of, Dermatology, Westmead Hospital, Sydney, NSW, Australia
| | - S Chou
- Department of, Tissue Pathology and Diagnostic Oncology, Westmead Hospital, Sydney, NSW, Australia
| | - P Fernandez-Peñas
- Departments of, Department of, Dermatology, Westmead Hospital, Sydney, NSW, Australia
| |
Collapse
|
9
|
Zhao ZM, Yin ZZ, Pan LC, Liu Q, Chou S, Liu R. [Multimodality navigation for liver resection of complicated alveolar echinococcosis]. Zhonghua Yi Xue Za Zhi 2020; 100:3525-3528. [PMID: 33256296 DOI: 10.3760/cma.j.cn112137-20200327-00957] [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: 11/05/2022]
Abstract
Objective: To investigate the clinical application of multimodality navigation for liver resection in the treatment of complicated alveolar echinococcosis (AE). Methods: From October 2019 to February 2020, the clinical data and perioperative results of patients with AE treated by surgery in our department were retrospectively studied. Hepatic parenchyma disconnection plane and liver resection were navigated and performed with three-dimensional reconstruction and HITACHI real-time multi-image fusion interventional navigation system (RVS). Results: All of six patients were successful performed radical liver resection without mortality. The operation time was (301±106)min and the median blood loss was 200 ml. Two patients needed blood transfusion intraoperative (33.33%). The postoperative hospital stay was (10.8±2.8) day, and the cost of hospitalization was (82 584±995.61) yuan. Clavien-Dindo grade Ⅲ complication occurred in one patient. Conclusions: Multimodality navigation might provide precise intraoperative navigation of the surgical plane and effectively assist liver resection for the treatment of complicated AE.
Collapse
Affiliation(s)
- Z M Zhao
- The Second Department of Hepatopancreatobiliary Surgery, the First Medical Center, Chinese People's Liberation Army General Hospital, Haidian district, Beijing, 100853, China
| | - Z Z Yin
- The Second Department of Hepatopancreatobiliary Surgery, the First Medical Center, Chinese People's Liberation Army General Hospital, Haidian district, Beijing, 100853, China
| | - L C Pan
- The Second Department of Hepatopancreatobiliary Surgery, the First Medical Center, Chinese People's Liberation Army General Hospital, Haidian district, Beijing, 100853, China
| | - Q Liu
- The Second Department of Hepatopancreatobiliary Surgery, the First Medical Center, Chinese People's Liberation Army General Hospital, Haidian district, Beijing, 100853, China
| | - S Chou
- The Second Department of Hepatopancreatobiliary Surgery, the First Medical Center, Chinese People's Liberation Army General Hospital, Haidian district, Beijing, 100853, China
| | - R Liu
- The Second Department of Hepatopancreatobiliary Surgery, the First Medical Center, Chinese People's Liberation Army General Hospital, Haidian district, Beijing, 100853, China
| |
Collapse
|
10
|
Chou S, Li B, Tan H, Cui H, Zhang S, Wang H, Meng X. Effect of ultrahigh pressure on structural and physicochemical properties of rice and corn starch in complexes with apple polyphenols. J Sci Food Agric 2020; 100:5395-5402. [PMID: 32535914 DOI: 10.1002/jsfa.10589] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 06/05/2020] [Accepted: 06/14/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Ultrahigh-pressure (UHP) treatment, a non-thermal processing technology, exerts a bactericidal effect and affects food texture. How UHP treatments influence starch-polyphenol complexes has not yet been reported. Here, we studied the effects of UHP treatment on the structure of common rice starch (CRS)-apple polyphenol (AP) and common corn starch (CCS)-AP mixtures. RESULTS Overall, UHP treatment decreased the particle size of the CRS-AP and CCS-AP composites. Furthermore, the ΔH values of the CRS-AP and CCS-AP mixtures decreased, and the heating stability was improved after UHP treatment. X-ray diffraction indicated that the relative crystallinity of the mixtures was unaffected by UHP treatment. Fourier-transform infrared spectroscopy proved that no new absorption peaks were observed in the infrared spectra, and the order of starch-AP was decreased after UHP treatment. These results indicated that UHP treatment inhibited the retrogradation of the starch-AP mixture. Our analyses of the microstructures of CRS-AP and CCS-AP mixtures showed increased folding and more pronounced network structures under high-pressure. CONCLUSIONS These results provide a theoretical basis for further exploring the properties of starch-AP mixtures following UHP treatment and provide insights regarding the use of UHP treatments for food production. © 2020 Society of Chemical Industry.
Collapse
Affiliation(s)
- Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| | - Hui Tan
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| | - Huijun Cui
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| | - Shuyi Zhang
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| | - Hanchen Wang
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| | - Xianjun Meng
- College of Food Science, Shenyang Agricultural University, Shenyang, PR China
| |
Collapse
|
11
|
Chou S, Li B, Tan H, Zhang W, Zang Z, Cui H, Wang H, Zhang S, Meng X. The effect of pH on the chemical and structural interactions between apple polyphenol and starch derived from rice and maize. Food Sci Nutr 2020; 8:5026-5035. [PMID: 32994963 PMCID: PMC7500801 DOI: 10.1002/fsn3.1800] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Revised: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 12/15/2022] Open
Abstract
To date, how pH affects starch-polyphenol mixtures has not been thoroughly investigated. This study explored the impact of combining apple polyphenol (AP) with both normal rice starch (NRS) and normal maize starch (NMS) across a range of pH conditions. NRS-AP mixture particle sizes across a pH range of 3-8 varied from 169.9 ± 5.4 to 187.5 ± 6.9 μm, while for NMS-AP particles, these sizes ranged from 161.8 ± 8.0 to 176.0 ± 4.9 μm, indicating that the aggregation of starch-AP was inhibited under low pH condition. The melting enthalpy (△H) values of the NRS-AP mixture across a pH range of 3-8 were 8.50 ± 0.06-9.56 ± 0.12 J/g, while the corresponding value for the NMS-AP mixture was 5.77 ± 0.05-6.21 ± 0.08 J/g. FTIR analyses revealed that the degree of order of these starch-AP mixtures significantly decreased under low pH conditions. XRD analysis further revealed that both NRS-AP and NMS-AP mixtures exhibited V-type structures, and relative crystallinity levels decreased significantly under low pH conditions. Together, these results indicate that low pH values inhibit the recrystallization of NRS-AP and NMS-AP mixtures. Overall, these findings provide additional evidence regarding the interactions between AP and specific starches under a range of pH conditions.
Collapse
Affiliation(s)
- Shurui Chou
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Bin Li
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Hui Tan
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Weijia Zhang
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Zhihuan Zang
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Huijun Cui
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Hanchen Wang
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Shuyi Zhang
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| | - Xianjun Meng
- College of Food ScienceShenyang Agricultural UniversityShenyangChina
| |
Collapse
|
12
|
Zang Z, Chou S, Tian J, Lang Y, Shen Y, Ran X, Gao N, Li B. Effect of whey protein isolate on the stability and antioxidant capacity of blueberry anthocyanins: A mechanistic and in vitro simulation study. Food Chem 2020; 336:127700. [PMID: 32768906 DOI: 10.1016/j.foodchem.2020.127700] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [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: 04/10/2020] [Revised: 07/17/2020] [Accepted: 07/26/2020] [Indexed: 01/06/2023]
Abstract
The processing stability and antioxidant capacity of blueberry anthocyanins (ANs) in the presence of whey protein isolate (WPI) were examined. WPI was found to enhance both the stability and antioxidant activity of ANs during processing and simulated in vitro digestion, especially at a concentration of 0.15 mg·mL-1. Fluorescence and ultraviolet-visible absorption spectroscopy showed that ANs were primarily stabilized by hydrophobic forces between WPI and malvidin-3-O-galactoside (M3G), the major anthocyanin monomer. Circular dichroism and Fourier-transform infrared spectroscopy confirmed that the structure of WPI changed and the microenvironments of certain amino acid residues were modulated by non-covalent binding to M3G; furthermore, fewer α-helices and more β-sheets were formed. Molecular docking studies revealed that WPI, especially immunoglobulin (IgG), contributed the most to ANs stability via hydrogen bonds and hydrophobic forces according to molecular docking scores (-141.30 kcal/mol). These results provided an important fundamental basis for improving the stabilities of ANs in milk systems.
Collapse
Affiliation(s)
- Zhihuan Zang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Jinlong Tian
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yuxi Lang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Yixiao Shen
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xulong Ran
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Ningxuan Gao
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
| |
Collapse
|
13
|
Chou S, Chang ZY, Zhao GD, Song DD, Zhang X, Hu MG, Liu R. [Robotic hilar cholangiocarcinoma radical resection compared with laparotomy in prognosis]. Zhonghua Wai Ke Za Zhi 2020; 58:230-234. [PMID: 32187928 DOI: 10.3760/cma.j.issn.0529-5815.2020.03.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To compare the long term and short term outcomes between robotic and open surgery for hilar cholangiocarcinoma radical resection. Methods: This is a single-center and retrospective case-control study. Patients underwent hilar cholangiocarcinoma radical resection between January 2016 and December 2016 at Department of Hepatobiliary Surgery of the General Hospital of the Chinese People's Liberation Army were included. Safety, effectiveness and long-term prognosis of tumors were evaluated. Patients were divided into robotic hilar cholangiocarcinoma radical surgery group (robotic group, n=16) and open hepatic hilar cholangiocarcinoma radical surgery group (open group, n=31) . All cases were confirmed by pathology histological. Age, gender, histology, resection margin status, extent of surgical resection, disease-free survival (DFS) , and overall survival (OS) were retrospectively collected and analyzed.In the follow-up cohort, the primary outcome was patient death and the secondary outcome was tumor recurrence. Continuous variables were expressed as means and medians and were compared using the Student t test if normally distributed or Wilcoxon-Mann-Whitney test for nonparametric variables. Discrete variables were expressed as frequency and percentages and χ(2) or Fisher exact test, when appropriate, were used for comparisons. Kaplan-Meier curves were used to calculate the probability of survival and comparisons were performed using log-rank test. Results: In this study, compared with the open group, the robotic group had a longer operation time ( (338±71) minutes vs. (256±56) minutes, t=4.251, P=0.001) , but the intraoperative blood loss was less (100 ml vs. 200 ml, Z=121.50, P=0.040) , the gastric tube removal time was earlier (3 days vs. 4 days, Z=136.0, P=0.011) , and the postoperative hospital stay was shorter (9 days vs. 12 days, Z=144.50, P=0.040) , and the difference was statistically significant.There was no significant difference in the blood transfusion rate, R0 resection rate, and tumor size between the two groups.The recurrence rates in the robotic group and open surgery were 53.3% and 67.0%, respectively (χ(2)=1.04, P=0.307) .The median survival time of the robotic group and the open group was 22.0 months and 25.0 months. There was no significant difference in the overall survival rate between the two groups (P>0.05) . Conclusion: Compared with laparotomy, robotic HCC radical resection could have an equivalence or non-inferiority approach with acceptable long-term outcome.
Collapse
Affiliation(s)
- S Chou
- Second Department of Hepatobiliary Surgery, the First Medical Center of People's Liberation Army General Hospital, Beijing 100853, China
| | | | | | | | | | | | | |
Collapse
|
14
|
Huang T, Li S, Chen Y, Lu H, Lo C, Fang F, Chou S, Wang Y. PO-0799 Treatment outcomes of nodal positive unresectable thoracic esophageal carcinoma. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31219-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
Liu RC, Consuegra G, Chou S, Fernandez Peñas P. Vitiligo-like depigmentation in oncology patients treated with immunotherapies for nonmelanoma metastatic cancers. Clin Exp Dermatol 2019; 44:643-646. [PMID: 30618056 DOI: 10.1111/ced.13867] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/17/2018] [Indexed: 11/29/2022]
Abstract
Vitiligo-like depigmentation (VLD) is a characteristic cutaneous event described in patients with metastatic malignant melanoma receiving treatment with immune checkpoint inhibitors. We report the onset of VLD in three patients with other cancer types (cholangiocarcinoma, renal cell carcinoma and squamous cell carcinoma) following treatment with immunotherapy (combination pembrolizumab and nivolumab for the first, and pembrolizumab for the other two cancer types). Cases of VLD have not been reported previously in patients treated for any of these cancers, to our knowledge. Pembrolizumab and nivolumab are monoclonal antibodies targeting programmed cell death (PD)-1 receptors, while ipilimumab targets cytotoxic T-lymphocyte antigen-4. Our clinical finding challenges the current understanding of VLD as a malignant melanoma-specific immunotherapy-related adverse event.
Collapse
Affiliation(s)
- R C Liu
- Department of Dermatology, Westmead Hospital, Sydney, Australia.,Westmead Clinical School, the University of Sydney Medical School, Sydney, Australia
| | - G Consuegra
- Department of Dermatology, Westmead Hospital, Sydney, Australia.,Westmead Clinical School, the University of Sydney Medical School, Sydney, Australia
| | - S Chou
- Tissue Pathology and Diagnostic Oncology, Westmead Hospital, Sydney, Australia
| | - P Fernandez Peñas
- Department of Dermatology, Westmead Hospital, Sydney, Australia.,Westmead Clinical School, the University of Sydney Medical School, Sydney, Australia
| |
Collapse
|
16
|
Chou S, Meng X, Cui H, Zhang S, Wang H, Li B. Rheological and pasting properties of maize, wheat and rice starch as affected by apple polyphenols. International Journal of Food Properties 2019. [DOI: 10.1080/10942912.2019.1671452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xianjun Meng
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Huijun Cui
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Shuyi Zhang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Hanchen Wang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning, China
| |
Collapse
|
17
|
Wang Y, Xie X, Ran X, Chou S, Jiao X, Li E, Zhang Q, Meng X, Li B. Comparative analysis of the polyphenols profiles and the antioxidant and cytotoxicity properties of various blue honeysuckle varieties. OPEN CHEM 2018. [DOI: 10.1515/chem-2018-0072] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractThe polyphenol profile, antioxidant activity (particularly peroxyl radical-scavenging capacity (PSC) and cellular antioxidant activity (CAA)) and cytotoxicity of extracts from seven varieties of blue honeysuckle were compared in this study. Moreover, an analysis of correlations between individual polyphenol profiles and antioxidant activities was also conducted. Seventeen components were found in the investigated blue honeysuckle extracts, with anthocyanins being the prominent bioactive components among polyphenols. Fruit peel contained higher concentrations of individual anthocyanins compared to the fruit pulp. Beilei blue honeysuckle had the highest antioxidant activity. Correlation analysis showed that antioxidant activity values were highly associated with cyanidin-3-glucoside levels. Blue honeysuckle extracts were not cytotoxic over the range of doses tested. Among the varieties analyzed, Beilei possessed the highest antioxidant properties and was found to be the most appropriate source of natural antioxidants.
Collapse
Affiliation(s)
- Yuehua Wang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xu Xie
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xulong Ran
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xinyao Jiao
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Enhui Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Qi Zhang
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Xianjun Meng
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| |
Collapse
|
18
|
Guo S, Wang Y, Chou S, Cui H, Li D, Li B. In vitro antioxidant capacities of eight different kinds of apples and their effects on lipopolysaccharide-induced oxidative damage in mice. PLoS One 2018; 13:e0191762. [PMID: 29370253 PMCID: PMC5784986 DOI: 10.1371/journal.pone.0191762] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Accepted: 01/10/2018] [Indexed: 12/21/2022] Open
Abstract
In the present study, the DPPH and ABTS+ radical scavenging activity of eight types of apples decreased (P < 0.05) during the 70-day storage at 4°C. The Fushi (F2) apples from Xin Jiang showed the highest radical scavenging activity. For in vivo study, 40 male Kunming mice (body weight 20–25 g) were selected and randomly assigned to four groups (10 mice per group). The F2 groups (F2S, F2 + sterile saline and F2L, F2 + lipopolysaccharide) were administered with 0.3 mL F2 filtrate via gastric intubation daily for 28 days. The control groups (CS, CON + sterile saline and CL, CON + lipopolysaccharide) were treated with sterile saline at the same volume. At day 29, mice of F2L and CL groups were injected with 100 μg/kg body weight of lipopolysaccharide (LPS) intraperitoneally, while those of F2S and CS groups were injected equal volume of sterile saline. In comparison to the CS group, the CL group showed a decrease (P < 0.05) in serum, liver, and hepatic mitochondrial antioxidant capacity, reduction (P < 0.05) in the expression of hepatic antioxidant-related genes, and an increase (P < 0.05) in serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), malondialdehyde (MDA), protein carbonyl (PC), and reactive oxygen species (ROS). In comparison to the CL group, the F2L group showed lower (P < 0.05) levels of serum ALT, AST, and ROS, higher (P < 0.05) level of serum, liver, and hepatic mitochondrial antioxidant capacity, increased mitochondrial membrane potential (MMP), and enhanced (P < 0.05) expression of hepatic antioxidant-related genes. These results suggest that F2 may exert protective effect against LPS-induced oxidative damage by improving the antioxidant capacity.
Collapse
Affiliation(s)
- Shuang Guo
- College of Food Science, Shenyang Agricultural University, Liaoning, China
| | - Yuehua Wang
- College of Food Science, Shenyang Agricultural University, Liaoning, China
| | - Shurui Chou
- College of Food Science, Shenyang Agricultural University, Liaoning, China
| | - Huijun Cui
- College of Food Science, Shenyang Agricultural University, Liaoning, China
| | - Dongnan Li
- College of Food Science, Shenyang Agricultural University, Liaoning, China
| | - Bin Li
- College of Food Science, Shenyang Agricultural University, Liaoning, China
- * E-mail:
| |
Collapse
|
19
|
Gao N, Wang Y, Jiao X, Chou S, Li E, Li B. Preparative Purification of Polyphenols from Aronia melanocarpa (Chokeberry) with Cellular Antioxidant and Antiproliferative Activity. Molecules 2018; 23:E139. [PMID: 29320456 PMCID: PMC6017104 DOI: 10.3390/molecules23010139] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 01/09/2018] [Accepted: 01/09/2018] [Indexed: 12/24/2022] Open
Abstract
The aim of this study was the purification process of polyphenols from Aronia melanocarpa (chokeberry), and the purification parameters were optimised by adsorption and desorption tests. By comparing adsorption and desorption ability of polyphenols from chokeberry on six kinds of macroporous resin, XAD-7 resin was selected. Experiments prove that the best purification parameters of static adsorption and desorption were sample pH = 4.0 with 4 h of adsorption; and desorption solvent is 95% ethanol (pH = 7.0) with 2 h of desorption. The best dynamic parameters were 9.3 bed volume (BV) of sample loading amount at a feeding flow rate of 2 BV/h, and washing the column with 5.8 BV of water, followed by subsequent elution with an eluent volume of 5.0 mL at an elution flow rate of 2 BV/h. Next the antioxidant and antiproliferative activity of polyphenols from chokeberry, blueberries, haskap berries was studied on HepG2 human liver cancer cells. The results show that polyphenol from chokeberry has a strong antioxidant effect. Taking into account the content of polyphenols in fruit, polyphenols from chokeberry represent a very valuable natural antioxidant source with antiproliferative products.
Collapse
Affiliation(s)
- Ningxuan Gao
- Department of Food Science, College of Food, Shenyang Agriculture University, Shenyang 110161, China.
| | - Yuehua Wang
- Department of Food Science, College of Food, Shenyang Agriculture University, Shenyang 110161, China.
| | - Xinyao Jiao
- Department of Food Science, College of Food, Shenyang Agriculture University, Shenyang 110161, China.
| | - Shurui Chou
- Department of Food Science, College of Food, Shenyang Agriculture University, Shenyang 110161, China.
| | - Enhui Li
- Department of Food Science, College of Food, Shenyang Agriculture University, Shenyang 110161, China.
| | - Bin Li
- Department of Food Science, College of Food, Shenyang Agriculture University, Shenyang 110161, China.
| |
Collapse
|
20
|
Chandraratnam E, Santos L, Chou S, Dai J, Syeda L, Eslick G, Chin R. Remote frozen section examination of parathyroidectomy specimens by telepathology using Mikroscan D2 and Aperio LV1: a validation study. Intern Med J 2017. [DOI: 10.1111/imj.3_13457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - L Santos
- South Western Area Pathology Service (SWAPS); Liverpool Hospital; Australia
| | - S Chou
- Institute of Clinical Pathology and Medical Research (ICPMR); Westmead Hospital; Australia
| | - J Dai
- Nepean Hospital; Kingswood New South Wales Australia
| | - L Syeda
- Austpath Laboratories; Northmead New South Wales Australia
| | - G Eslick
- The University of Sydney and the Mann Whitney Institute; Australia
| | - R Chin
- Nepean Hospital; Kingswood New South Wales Australia
| |
Collapse
|
21
|
Lo W, Chuang J, Ko C, Chou S, Chen R, Chang K, Hung J, Su W, Chang W, Hsu T. P05.06 Upregulation of CYP17A1 by Sp1-mediated DNA demethylation confers temozolomide resistance through DHEA-mediated protection in glioma. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
22
|
Chou S, Xu J, Khrennikov K, Cardenas DE, Wenz J, Heigoldt M, Hofmann L, Veisz L, Karsch S. Collective Deceleration of Laser-Driven Electron Bunches. Phys Rev Lett 2016; 117:144801. [PMID: 27740829 DOI: 10.1103/physrevlett.117.144801] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Indexed: 06/06/2023]
Abstract
Few-fs electron bunches from laser wakefield acceleration (LWFA) can efficiently drive plasma wakefields (PWFs), as shown by their propagation through underdense plasma in two experiments. A strong and density-insensitive deceleration of the bunches has been observed in 2 mm of 10^{18} cm^{-3} density plasma with 5.1 GV/m average gradient, which is attributed to a self-driven PWF. This observation implies that the physics of PWFs, usually relying on large-scale rf accelerators as drivers, can be studied by tabletop LWFA electron sources.
Collapse
Affiliation(s)
- S Chou
- Max-Planck Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| | - J Xu
- Max-Planck Institut für Quantenoptik, 85748 Garching, Germany
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800, China
| | - K Khrennikov
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| | - D E Cardenas
- Max-Planck Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| | - J Wenz
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| | - M Heigoldt
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| | - L Hofmann
- Max-Planck Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| | - L Veisz
- Max-Planck Institut für Quantenoptik, 85748 Garching, Germany
- Department of Physics, Umeå University, SE-901 87 Umeå, Sweden
| | - S Karsch
- Max-Planck Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians Universität, 85748 Garching, Germany
| |
Collapse
|
23
|
Hutterer C, Hamilton S, Steingruber M, Zeitträger I, Bahsi H, Thuma N, Naing Z, Örfi Z, Örfi L, Socher E, Sticht H, Rawlinson W, Chou S, Haupt VJ, Marschall M. The chemical class of quinazoline compounds provides a core structure for the design of anticytomegaloviral kinase inhibitors. Antiviral Res 2016; 134:130-143. [PMID: 27515131 DOI: 10.1016/j.antiviral.2016.08.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [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: 03/31/2016] [Revised: 07/28/2016] [Accepted: 08/05/2016] [Indexed: 12/26/2022]
Abstract
HCMV is a member of the family Herpesviridae and represents a worldwide distributed pathogen with seropositivity rates in the adult population ranging between 40% and 90%. Notably, HCMV infection is a serious, sometimes life-threatening medical problem for newborns and immunosuppressed individuals, including transplant recipients and patients under antitumoral chemotherapy. Current standard therapy with valganciclovir has the disadvantage of inducing drug-resistant virus mutants and toxicity-related side effects. Our analysis stresses the earlier finding that kinase inhibitors of the quinazoline class exert an antiviral response by targeting the viral protein kinase pUL97 without inducing resistance. Therefore, quinazolines have been used as a core structure to gain insight in the mode of inhibitor-kinase interaction. Here, we demonstrate that (i) the novel quinazolines Vi7392 and Vi7453 are highly active against HCMV laboratory and clinically relevant strains including maribavir- and ganciclovir-resistant variants, (ii) antiviral activity is not cell-type specific and was also detected in a placental explant tissue model using a genetically intact HCMV strain (iii) the viral kinase pUL97 represents a target of the anticytomegaloviral activity of these compounds, (iv) induction of pUL97-conferring drug resistance was not detectable under single-step selection, thus differed from the induction of ganciclovir resistance, and (v) pUL97 drug docking simulations enabled detailed insights into specific drug-target binding properties providing a promising basis for the design of optimized kinase inhibitors. These novel findings may open new prospects for the future medical use of quinazoline drug candidates and the use of drug-target dynamic simulations for rational design of antivirals.
Collapse
Affiliation(s)
- C Hutterer
- Institute of Clinical and Molecular Virology, Friedrich-Alexander University (FAU) of Erlangen-Nürnberg, Erlangen, Germany.
| | - S Hamilton
- Serology and Virology Division, SEALS Microbiology Prince of Wales Hospital Randwick NSW 2013 and SOMS and BABS, University of NSW, Sydney, Australia
| | - M Steingruber
- Institute of Clinical and Molecular Virology, Friedrich-Alexander University (FAU) of Erlangen-Nürnberg, Erlangen, Germany
| | - I Zeitträger
- Institute of Clinical and Molecular Virology, Friedrich-Alexander University (FAU) of Erlangen-Nürnberg, Erlangen, Germany
| | - H Bahsi
- Institute of Clinical and Molecular Virology, Friedrich-Alexander University (FAU) of Erlangen-Nürnberg, Erlangen, Germany
| | - N Thuma
- Institute of Clinical and Molecular Virology, Friedrich-Alexander University (FAU) of Erlangen-Nürnberg, Erlangen, Germany
| | - Z Naing
- Serology and Virology Division, SEALS Microbiology Prince of Wales Hospital Randwick NSW 2013 and SOMS and BABS, University of NSW, Sydney, Australia
| | - Z Örfi
- Department of Molecular Biology, Max-Planck-Institute of Biochemistry, Martinsried, Germany
| | - L Örfi
- Semmelweis University, Department of Pharmaceutical Chemistry, Budapest, Hungary
| | - E Socher
- Division of Bioinformatics, Institute of Biochemistry, FAU of Erlangen-Nürnberg, Erlangen, Germany
| | - H Sticht
- Division of Bioinformatics, Institute of Biochemistry, FAU of Erlangen-Nürnberg, Erlangen, Germany
| | - W Rawlinson
- Serology and Virology Division, SEALS Microbiology Prince of Wales Hospital Randwick NSW 2013 and SOMS and BABS, University of NSW, Sydney, Australia
| | - S Chou
- Division of Infectious Diseases, Oregon Health and Science University and VA Medical Center, Portland, USA
| | - V J Haupt
- Biotechnology Center, Technische Universität Dresden, Dresden, Germany
| | - M Marschall
- Institute of Clinical and Molecular Virology, Friedrich-Alexander University (FAU) of Erlangen-Nürnberg, Erlangen, Germany
| |
Collapse
|
24
|
Chou S, Yang C, Lo Y. Fetal Mesenchymal Stem Cells Exhibit a Wnt-dependent Protective Action on Radiation-induced Hematopoietic Failure. Cytotherapy 2016. [DOI: 10.1016/j.jcyt.2016.03.232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
25
|
Heck O, Anxionnat R, Bracard S, Cai X, Han S, Feske S, Chou S. Pearls & Oy-sters: Small but consequential: Intracerebral hemorrhage caused by lenticulostriate artery aneurysm. Neurology 2013; 81:1881. [DOI: 10.1212/01.wnl.0000435757.50996.ae] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
26
|
Molgat-Seon Y, Daboval T, Chou S, Jay O. Accidental overheating of a newborn under an infant radiant warmer: a lesson for future use. J Perinatol 2013; 33:738-9. [PMID: 23986092 DOI: 10.1038/jp.2013.32] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 01/30/2013] [Accepted: 02/21/2013] [Indexed: 11/09/2022]
Abstract
A fully functional radiant warmer induced rapid and continuous increases in regional skin temperatures, heart rate, mean arterial blood pressure and respiratory rate in a newborn patient without corrective action. We report this case of passive overheating to create awareness of the risks associated with regulating radiant heat output based upon a single servo-controlled temperature.
Collapse
Affiliation(s)
- Y Molgat-Seon
- Thermal Ergonomics Laboratory, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | | | | | | |
Collapse
|
27
|
Mohd Affandi A, Anforth R, Chou S, Fernadez-Peñas P. Non-evolving linear facial plaque. Clin Exp Dermatol 2013; 38:681-3. [PMID: 23581846 DOI: 10.1111/ced.12023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2012] [Indexed: 11/28/2022]
Affiliation(s)
- A Mohd Affandi
- Department of Dermatology, Westmead Hospital, New South Wales, Australia
| | | | | | | |
Collapse
|
28
|
Goosen MF, O'Shea GM, Gharapetian HM, Chou S, Sun AM. Optimization of microencapsulation parameters: Semipermeable microcapsules as a bioartificial pancreas. Biotechnol Bioeng 2012; 27:146-50. [PMID: 18553649 DOI: 10.1002/bit.260270207] [Citation(s) in RCA: 272] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An improved membrane has been developed for the microencapsulation of islets of Langerhans which protects these cells from the immune system. These requirements were accomplished through the optimization of important microencapsulation parameters and through the improved biocompatibility of a new alginate-poly-l-lysine (PLL)-alginate capsule membrane. Spherical and smooth microcapsules could be formed by utilizing a purer sodium alginate and by keeping the viscosity of the sodium alginate solution above 30 cps. The strength of the capsule membrane was enhanced by increasing the alginate-PLL reaction time as well as the PLL concentration. The permeability of the membrane [4 mum thick, 93% (w/w) water] was a function of the viscosity average molecular weight (Mv) of the PLL (Mv = 4000-4 x 10(5)) used in the encapsulation procedure. Microcapsules prepared with PLL with Mv = 1.7 x 10(4) were the least permeable, being impermeable to normal serum immunoglobulin, albumin, and haemoglobin. The microencapsulation procedure, by protecting transplanted tissue from the components of the immune system, has great clinical potential as a new form of treatment for diseases such as diabetes and liver disease.
Collapse
Affiliation(s)
- M F Goosen
- Connaught Research Institute, 1755 Steeles Avenue West, Willowdale, Ontario M2N 3T4 Canada
| | | | | | | | | |
Collapse
|
29
|
Cai X, Han S, Chou S. Small but Consequential: A Case of Deep Intracerebral Hemorrhage (ICH) Caused by Distal Lenticulostriate Artery Aneurysm (P05.218). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p05.218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
30
|
Avery RK, Marty FM, Strasfeld L, Lee I, Arrieta A, Chou S, Tatarowicz W, Villano S. Oral maribavir for treatment of refractory or resistant cytomegalovirus infections in transplant recipients. Transpl Infect Dis 2011; 12:489-96. [PMID: 20682012 DOI: 10.1111/j.1399-3062.2010.00550.x] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Despite advances in cytomegalovirus (CMV) prophylaxis and therapy, some transplant recipients still develop refractory CMV infections. Maribavir (MBV), an investigational benzimidazole antiviral agent, acts by a mechanism different from that of existing anti-CMV drugs. Previous Phase I and II studies have demonstrated a favorable safety profile for MBV, but its utility in treatment of complex CMV syndromes is unknown. METHODS Between June and December 2008, MBV was released for use under individual emergency investigational new drug applications requested by treating physicians and approved by the US Food and Drug Administration and local institutional review boards. Six patients (5 solid organ transplant recipients and 1 hematopoietic stem cell transplant recipient) who had failed to respond to other therapies and/or had known ganciclovir-resistant CMV were treated with MBV at a starting oral dose of 400 mg twice daily. RESULTS Patients were treated for a median of 207 days (range, 15-376). Four of 6 patients had no detectable CMV DNAemia within 6 weeks of starting MBV therapy. One patient, who had an initial viral load of 1.8 million copies/mL, developed MBV resistance mutations. One patient, who had low serum levels of MBV, had persistent CMV DNAemia and viruria without developing genotypic or phenotypic resistance to MBV. One patient cleared CMV DNAemia, but died of pneumonia and multiorgan failure. No significant adverse effects attributable to MBV were observed. CONCLUSIONS MBV deserves further systematic evaluation as treatment for CMV infection that is resistant and/or refractory to standard therapies, but its optimal dose, duration of therapy, and use in combinations versus as a single agent have yet to be determined.
Collapse
Affiliation(s)
- R K Avery
- Infectious Diseases, The Cleveland Clinic, Cleveland, Ohio, USA
| | | | | | | | | | | | | | | |
Collapse
|
31
|
Chou S, Cai X, Konigsberg R, Bresette L, Henderson G, Sorond F, Ropper A, Feske S. Thromboembolic risks of recombinant factor VIIa use in warfarin-associated intracranial hemorrhage. Crit Care 2011. [PMCID: PMC3068362 DOI: 10.1186/cc9853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
|
32
|
Elyas R, Guerra LA, Pike J, DeCarli C, Betolli M, Bass J, Chou S, Sweeney B, Rubin S, Barrowman N, Moher D, Leonard M. Is staging beneficial for Fowler-Stephens orchiopexy? A systematic review. J Urol 2010; 183:2012-8. [PMID: 20303527 DOI: 10.1016/j.juro.2010.01.035] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Indexed: 10/19/2022]
Abstract
PURPOSE Fowler and Stephens showed that by dividing the spermatic vessels a high intra-abdominal testis could be placed in the scrotum. Testicular atrophy is a potential complication of this technique. We conducted a systematic review to determine whether single or 2-stage Fowler-Stephens orchiopexy results in better testicular viability. MATERIALS AND METHODS We searched electronic databases, clinical trial registries and gray literature. We included reports describing boys younger than 18 years with a primary outcome of "testicular viability and position." We performed a meta-analysis using random effects models. Heterogeneity was assessed using forest plot and I(2) statistic. RESULTS We identified 1,807 citations and included 61 articles. Single stage Fowler-Stephens orchiopexy was discussed in 9 articles, a 2-stage procedure in 36 and both approaches in 16. There were no randomized controlled trials, and most studies were cohort or case series. The pooled estimate of success rates was 80% for single stage Fowler-Stephens orchiopexy (95% CI 75 to 86) and 85% for 2-stage Fowler-Stephens orchiopexy (95% CI 81 to 90). The pooled odds ratio of single stage vs 2-stage Fowler-Stephens orchiopexy was 2.0 (95% CI 1.1 to 3.9) favoring the 2-stage procedure. There was no difference in the success rate between laparoscopic and open techniques in either single or 2-stage Fowler-Stephens orchiopexy. There was no evidence of asymmetry on the funnel plot. There were no complications reported with single stage, while ileus, hematoma and infection were the most common complications with 2-stage Fowler-Stephens orchiopexy. CONCLUSIONS Both techniques have a fairly high success rate but 2-stage Fowler-Stephens orchiopexy appears to carry a higher rate of success than the single stage approach (85% vs 80%, OR 2 in favor of 2-stage). Laparoscopic and open techniques had the same success rate. However, the level of evidence of the studies was low, and a study of a more robust design, such as a randomized controlled trial, should be performed.
Collapse
Affiliation(s)
- R Elyas
- Queens University, Kingston, Ontario, Canada
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Tonelli M, Hemmelgarn B, Gill JS, Chou S, Culleton B, Klarenbach S, Manns B, Wiebe N, Gourishankar S. Patient and allograft survival of Indo Asian and East Asian dialysis patients treated in Canada. Kidney Int 2007; 72:499-504. [PMID: 17554253 DOI: 10.1038/sj.ki.5002367] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Kidney failure is relatively common among Canadians of Asian origin. However, little is known about the health outcomes after initiation of renal replacement therapy in this population. Our study evaluates differences in the likelihood of renal transplantation and graft loss among Asian and white patients. We studied 21 523 adults of East Asian, Indo Asian or white ethnicity who had initiated dialysis in Canada from 1990-2000. Subjects were followed until death, loss to follow-up or end of study (2004). The proportion of the eligible subjects who were East Asian, Indo Asian, or white was 6, 3, and 91%, respectively. Compared to white patients, East Asian and Indo Asian patients were significantly less likely to receive a renal transplant after adjusting for potential confounding factors. This disparity is greater for transplants from living donors as compared to those from deceased donors. The adjusted death censored graft loss in transplant recipients was not significantly different between ethnic groups. The adjusted risk of death following transplantation, however, was significantly lower in Indo Asian than in white patients. Our findings show that in a Canadian population, patients of East Asian or Indo Asian origin had lower rates of renal transplantation than white patients, especially for living donor transplantation. These findings warrant further study, especially given the good graft outcomes in these individuals.
Collapse
Affiliation(s)
- M Tonelli
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
| | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Cantero A, Barthakur S, Bushart TJ, Chou S, Morgan RO, Fernandez MP, Clark GB, Roux SJ. Expression profiling of the Arabidopsis annexin gene family during germination, de-etiolation and abiotic stress. Plant Physiol Biochem 2006; 44:13-24. [PMID: 16531057 DOI: 10.1016/j.plaphy.2006.02.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2005] [Indexed: 05/07/2023]
Abstract
Annexins are a multigene family in most plant species and are suggested to play a role in a wide variety of essential cellular processes. In Arabidopsis thaliana there are eight different annexins (AnnAt1-8), which range from 29% to 83% in deduced amino acid sequence identity. As a first step toward clarifying the individual functions of these annexins, in this study we have used quantitative real time reverse transcription PCR to assess their differential expression in different tissues or after different stimuli. We determined which annexins are expressed during germination and early seedling growth by assaying annexin expression levels in dry and germinating seeds and in 7-day-old light-grown seedlings. Our results indicate that transcripts for all eight annexins are present in germinating seeds and that transcript levels for all the annexins increase by 7 days of normal growth. We assayed transcript levels in dark grown roots, cotyledons, and hypocotyls and found that the relative abundance of each annexin varied in these dark-grown tissues. We also examined the effects of red and far red light treatments on annexin expression in 5.5-day-old etiolated seedlings. Light treatments significantly altered transcript levels in hypocotyls and cotyledons for only two members of the gene family. Finally, we monitored annexin expression changes in response to a variety of abiotic stresses. We found that the expression of most of the Arabidopsis annexin genes is differentially regulated by exposure to salt, drought, and high- and low-temperature conditions, indicating a likely role for members of this gene family in stress responses.
Collapse
Affiliation(s)
- A Cantero
- Department of Molecular Cell and Developmental Biology, University of Texas, Austin, TX 78713, USA
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Pignatelli S, Dal Monte P, Rossini G, Chou S, Gojobori T, Hanada K, Guo JJ, Rawlinson W, Britt W, Mach M, Landini MP. Human cytomegalovirus glycoprotein N (gpUL73-gN) genomic variants: identification of a novel subgroup, geographical distribution and evidence of positive selective pressure. J Gen Virol 2003; 84:647-655. [PMID: 12604817 DOI: 10.1099/vir.0.18704-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Human cytomegalvirus (HCMV) ORF UL73 is a polymorphic locus, encoding the viral glycoprotein gpUL73-gN, a component of the gC-II envelope complex. The previously identified gN genomic variants, denoted gN-1, gN-2, gN-3 and gN-4, were further investigated in this work by analysing a large panel of HCMV clinical isolates collected from all over the world (223 samples). Sequencing and phylogenetic analysis confirmed the existence of the four gN genotypes, but also allowed the identification of a novel subgroup belonging to the gN-3 genotype, which was designated gN-3b. The number of non-synonymous (d(N)) and synonymous (d(S)) nucleotide substitutions and their ratio (d(N)/d(S)) were estimated among the gN genotypes to evaluate the possibility of positive selection. Results showed that the four variants evolved by neutral (random) selection, but that the gN-3 and gN-4 genotypes are maintained by positive selective pressure. The 223 HCMV clinical isolates were subdivided according to their geographical origin, and four main regions of gN prevalence were identified: Europe, China, Australia and Northern America. The gN variants were found to be widespread and represented within the regions analysed without any significant difference, and no new genotype was detected. Finally, for clinical and epidemiological purposes, a rapid and low-cost method for genetic grouping of the HCMV clinical isolates was developed based on the RFLP revealed by SacI, ScaI and SalI digestion of the PCR-amplified UL73 sequence. This technique enabled us to distinguish all four gN genomic variants and also their subtypes.
Collapse
Affiliation(s)
- S Pignatelli
- Department of Clinical and Experimental Medicine, Division Microbiology - St Orsola General Hospital, University of Bologna, Via Massarenti 9, 40138 Bologna, Italy
| | - P Dal Monte
- Department of Clinical and Experimental Medicine, Division Microbiology - St Orsola General Hospital, University of Bologna, Via Massarenti 9, 40138 Bologna, Italy
| | - G Rossini
- Department of Clinical and Experimental Medicine, Division Microbiology - St Orsola General Hospital, University of Bologna, Via Massarenti 9, 40138 Bologna, Italy
| | - S Chou
- Medical and Research Services, VA Medical Center and Division of Infectious Diseases, Oregon Health Sciences University, Portland, OR, USA
| | - T Gojobori
- Center of Information Biology, National Institute of Genetics, Mishima, Japan
| | - K Hanada
- Center of Information Biology, National Institute of Genetics, Mishima, Japan
| | - J J Guo
- Department of Clinical and Experimental Medicine, Division Microbiology - St Orsola General Hospital, University of Bologna, Via Massarenti 9, 40138 Bologna, Italy
| | - W Rawlinson
- Department of Microbiology, SEALS, Prince of Wales Hospital, Randwick, NSW, Australia
| | - W Britt
- Department of Pediatrics and Microbiology, University of Alabama, Birmingham, AL, USA
| | - M Mach
- Institute of Clinical and Molecular Virology, University of Erlangen-Nurnberg, Germany
| | - M P Landini
- Department of Clinical and Experimental Medicine, Division Microbiology - St Orsola General Hospital, University of Bologna, Via Massarenti 9, 40138 Bologna, Italy
| |
Collapse
|
36
|
Abstract
The widespread use of ganciclovir (GCV) to treat cytomegalovirus (CMV) infections in immunosuppressed patients has led to the development of drug resistance. Phenotypic assays for CMV drug resistance are presently too time-consuming to be therapeutically useful. To support the development of genotypic assays for GCV resistance, the complete sequences of the UL97 phosphotransferase genes in 28 phenotypically GCV-sensitive CMV clinical isolates were determined. The gene was found to be highly conserved, with nucleotide sequence identity among strains ranging from 98.6 to 100% and amino acid sequence identity of >99%. Primers for a genotypic assay were designed to amplify codons 400 to 707, because all known UL97 mutations conferring drug resistance occur at three sites within this region. This part of the UL97 gene was amplified from over 50 clinical isolates, and two sequencing reactions for the coding strand were successfully used to identify GCV resistance mutations. This genotypic assay can be performed in 48 h using genomic DNA extracted from cell monolayers at very low levels of virus infectivity, thus rapidly providing therapeutically useful results.
Collapse
Affiliation(s)
- N S Lurain
- Department of Immunology/Microbiology, Rush Medical College, Rush-Presbyterian-St. Luke's Medical Center, 1653 West Congress Pkwy., Chicago, IL 60612, USA.
| | | | | | | |
Collapse
|
37
|
Abstract
Clinical pathways are widely adopted by many large hospitals around the world in order to provide high-quality patient treatment and reduce the length of hospital stay of each patient. The development of clinical pathways is a lengthy process, and may require the collaboration among physicians, nurses, and staffs in a hospital. However, the individual differences cause great variances in the execution of clinical pathways. It calls for a more dynamic and adaptive process to improve the performance of clinical pathways. This paper reports a data mining technique we have developed to discover the time dependency pattern of clinical pathways for managing brain stroke. The mining of time dependency pattern is to discover patterns of process execution sequences and to identify the dependent relation between activities in a majority of cases. By obtaining the time dependency patterns, we can predict the paths for new patients when he/she is admitted into a hospital; in turn, the health care procedure will be more effective and efficient.
Collapse
Affiliation(s)
- F Lin
- Department of Information Management, National Sun Yat-sen University, Kaohsiung 804, Taiwan, ROC.
| | | | | | | |
Collapse
|
38
|
Masse L, Kennedy KJ, Chou S. Testing of alkaline and enzymatic hydrolysis pretreatments for fat particles in slaughterhouse wastewater. Bioresour Technol 2001; 77:145-155. [PMID: 11272021 DOI: 10.1016/s0960-8524(00)00146-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Four pretreatments to hydrolyse and/or reduce the size of fat particles in slaughterhouse wastewater (SHW) were tested: sodium hydroxide and three lipases of plant, bacterial and animal (pancreatic) origin. Hydrolysing agents and SHW containing between 2.5 and 3 g/l of fat particles were mixed at room temperature for 4 h. Additions of 5-400 meq NaOH/l did not increase soluble COD (SCOD) in SHW, but the average particle size was reduced to 73% +/- 7% of the initial average particle size (D(in)) at NaOH concentrations ranging from 150 to 300 meq/l. Pretreatment with pancreatic lipase PL-250 reduced the average particle size to a maximum of 60% +/- 3% of D(in). As D(in) was decreased from 359 to 68 microns, the enzyme concentration required to obtain the maximum particle size reduction increased from 200 to 1000 mg/l. A 4-h pretreatment with PL-250 also increased the free long-chain fatty acid (LCFA) concentration to a maximum of 15.5 mg/l, indicating some solubilization of the pork fat particles in SHW. SCOD was not significantly increased by the pretreatment, but SCOD was not found to be a good indicator of enzymatic lipolysis because of enzyme adsorption on the fat particle surface. Pancreatic lipase appeared more efficient with beef fat than pork fat, possibly because beef fat contains less polyunsaturated fatty acids than pork fat. The bacterial lipase LG-1000 was also efficient in reducing average fat particle size, but high doses (> 1000 mg/l) were required to obtain a significant reduction after 4 h of pretreatment. SCOD was not increased by pretreatment with LG-1000. No particle size reduction or changes in SCOD were noted after 4 h of pretreatment with the plant lipase EcoSystem Plus. It was concluded that PL-250 was the best pretreatment to hydrolyse fat particles in SHW. However, its impact on the efficiency of a downstream anaerobic digestion process remains to be tested.
Collapse
Affiliation(s)
- L Masse
- Agriculture and Agri-Food Canada, P.O. Box 90, 2000 Route 108 East, Lennoxville, Que., Canada J1M 1Z3
| | | | | |
Collapse
|
39
|
Chou S, Huang C, Huang YH. Heterogenous and homogenous catalytic oxidation by supported gamma-FeOOH in a fluidized-bed reactor: kinetic approach. Environ Sci Technol 2001; 35:1247-1251. [PMID: 11347940 DOI: 10.1021/es001129b] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Oxidation of benzoic acid (BA) by H2O2 was performed with a novel supported gamma-FeOOH catalyst in a circulating fluidized-bed reactor (CFBR). This study focused mainly on determining the proportions of homogeneous catalysis and heterogeneous catalysis in this CFBR. Also studied herein was how pH, H2O2 concentration, and BA concentration affect the oxidation of BA. Experimental results indicate that the decomposition rate of H2O2 was proportional to its concentration and that the oxidation rate of BA depended on both H2O2 and BA concentrations. The change in the rate constant of heterogeneous catalysis by pH was described in terms of ionization fractions of surface hydroxyl group. From the mathematical deduction, we can infer thatthe reaction rate associated with ...Fe(III)OH2+ is markedly higher than that with ...Fe(III)OH. Conclusively, although heterogeneous catalysis contributes primarily to the oxidation of BA at pH 4.4-7.0, the homogeneous catalysis is of increasing importance below pH 4.4 because of the reductive dissolution of gamma-FeOOH.
Collapse
Affiliation(s)
- S Chou
- Center for Environmental Safety and Health Technology, Industrial Technology Research Institute, Hsinchu, Taiwan, Republic of China.
| | | | | |
Collapse
|
40
|
Gopal DV, Rabkin JM, Berk BS, Corless CL, Chou S, Olyaei A, Orloff SL, Rosen HR. Treatment of progressive hepatitis C recurrence after liver transplantation with combination interferon plus ribavirin. Liver Transpl 2001; 7:181-90. [PMID: 11244158 DOI: 10.1053/jlts.2001.22447] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Hepatitis C virus (HCV) recurrence after orthotopic liver transplantation (OLT) is common, although the majority of cases are mild. A subset of transplant recipients develops progressive allograft injury, including cirrhosis and allograft failure. Minimal data are available on the safety and efficacy of antiviral treatment in this group of patients. The aim of this study is to review our experience in the treatment of moderate to severe HCV recurrence with combination interferon-alpha2b and ribavirin (IFN/RIB). Between October 1993 and October 1999, a total of 197 patients underwent OLT for HCV-related liver failure. This study describes 12 transplant recipients with moderate to severe recurrence treated with IFN/RIB. All patients met at least 1 of the following inclusion criteria: (1) moderate to severe inflammation (grade III to IV) on allograft biopsy, (2) bridging fibrosis on allograft biopsy, or (3) severe cholestasis attributable solely to HCV recurrence. Two patients had undergone re-OLT for allograft cirrhosis secondary to HCV recurrence and now had evidence of progressive HCV in their second allografts. Appropriate dose reductions of both IFN and RIB, as well as initiation of granulocyte colony-stimulating factor (G-CSF), for marked leukopenia were recorded. IFN/RIB therapy was started 60 to 647 days post-OLT, and duration of therapy ranged from 39 to 515 days. Seven patients were administered G-CSF to successfully treat leukopenia. Six of the 12 patients (50%) became HCV RNA negative by polymerase chain reaction. One of these 6 patients (no. 1) was HCV RNA negative at 6 months but chose to discontinue therapy because of intolerable side effects, experienced a relapse, and was HCV RNA positive at 12 months. Two of the remaining 5 patients were HCV RNA negative at 2 and 9 months off therapy. For the entire group, there was a statistically significant decrease in serum biochemical indices assessed at initiation of therapy and 1, 3, and 6 months into therapy. Most patients required dose reductions of both IFN and RIB. Five patients died; 3 patients died of liver-related complications that included severe intrahepatic biliary cholestasis, severe HCV recurrence, and chronic rejection with profound cholestasis. In the subset of HCV-positive liver transplant recipients with moderate to severe recurrence, combination IFN/RIB therapy resulted in complete virological response (serum RNA negative) in 6 of 12 patients ( approximately 50%). However, only 1 of 12 patients (8.3%) had sustained virological clearance after cessation of IFN/RIB therapy. Dose reductions of both IFN and RIB were required in most patients. The use of G-CSF (sometimes preemptively) allowed correction of leukopenia and full-dose antiviral therapy. Multicenter trials using combination therapy to identify factors predictive of response are needed in the subset of patients with progressive allograft injury.
Collapse
Affiliation(s)
- D V Gopal
- Divisions of Gastroenterology and Hepatology, Oregon Health Sciences Center and Portland Veteran Affairs Medical Center, 37 SW US Veterans Hospital Rd., Portland, OR 97201, USA
| | | | | | | | | | | | | | | |
Collapse
|
41
|
Chou S, Miner RC, Drew WL. A deletion mutation in region V of the cytomegalovirus DNA polymerase sequence confers multidrug resistance. J Infect Dis 2000; 182:1765-8. [PMID: 11069251 DOI: 10.1086/317618] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2000] [Revised: 08/10/2000] [Indexed: 11/04/2022] Open
Abstract
A patient with AIDS and cytomegalovirus (CMV) retinitis received ganciclovir and foscarnet for 20 and 5 months, respectively, with evidence of periodic disease progression. After this therapy, a CMV isolate from the patient was resistant to ganciclovir, foscarnet, and cidofovir. Sequence analysis showed a known ganciclovir resistance mutation in the viral UL97 phosphotransferase (L595F) and a new mutation in conserved region V of the DNA polymerase gene (pol) sequence (codons 981-982 deleted). The pol mutation was transferred to a laboratory CMV strain (Towne) by homologous recombination and selection with either ganciclovir or foscarnet. Recombinant viruses containing this deletion showed a 6-8-fold increased ganciclovir resistance and a 3-5-fold increased resistance to both foscarnet and cidofovir, compared with the wild-type CMV. A single mutation in region V of CMV pol can, therefore, confer multiple drug resistance in a clinical isolate.
Collapse
Affiliation(s)
- S Chou
- VA Medical Center P3ID, Portland, OR 97201, USA.
| | | | | |
Collapse
|
42
|
Mai X, Chou S, Struhl K. Preferential accessibility of the yeast his3 promoter is determined by a general property of the DNA sequence, not by specific elements. Mol Cell Biol 2000; 20:6668-76. [PMID: 10958664 PMCID: PMC86173 DOI: 10.1128/mcb.20.18.6668-6676.2000] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Yeast promoter regions are often more accessible to nuclear proteins than are nonpromoter regions. As assayed by HinfI endonuclease cleavage in living yeast cells, HinfI sites located in the promoters of all seven genes tested were 5- to 20-fold more accessible than sites in adjacent nonpromoter regions. HinfI hypersensitivity within the his3 promoter region is locally determined, since it was observed when this region was translocated to the middle of the ade2 structural gene. Detailed analysis of the his3 promoter indicated that preferential accessibility is not determined by specific elements such as the Gcn4 binding site, poly(dA-dT) sequences, TATA elements, or initiator elements or by transcriptional activity. However, progressive deletion of the promoter region in either direction resulted in a progressive loss of HinfI accessibility. Preferential accessibility is independent of the Swi-Snf chromatin remodeling complex, Gcn5 histone acetylase complexes Ada and SAGA, and Rad6, which ubiquitinates histone H2B. These results suggest that preferential accessibility of the his3 (and presumably other) promoter regions is determined by a general property of the DNA sequence (e.g., base composition or a related feature) rather than by defined sequence elements. The organization of the compact yeast genome into inherently distinct promoter and nonpromoter regions may ensure that transcription factors bind preferentially to appropriate sites in promoters rather than to the excess of irrelevant but equally high-affinity sites in nonpromoter regions.
Collapse
Affiliation(s)
- X Mai
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | | | | |
Collapse
|
43
|
Chou S, Skehan SJ, Brown AL, Rawlinson J, Somers S. Detection of unsuspected colonic abnormalities using the pneumocolon technique during small bowel meal examination. Clin Radiol 2000; 55:459-64. [PMID: 10873692 DOI: 10.1053/crad.2000.0475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
AIMS The pneumocolon technique in small bowel meal examination is used to obtain double-contrast views of the distal ileum. The purpose of this study was to determine the proportion of cases in which an overhead pneumocolon radiograph demonstrated clinically relevant findings in the colon. METHODS The overhead pneumocolon radiographs in 151 patients who underwent small bowel meals were evaluated retrospectively. A chart review was performed on those patients with positive colonic findings to determine if the suspected abnormalities affected patient management. RESULTS Colonic abnormalities were identified in 34 of the 151 patients. One patient had a previously undiagnosed ascending colonic cancer; 17 had evidence of acute or chronic colitis; 13 had diverticulosis; one had a caecal polyp; one had an ileosigmoid fistula; one had a filling defect in the ascending colon. In 25 cases the colonic abnormality was visible only on the pneumocolon radiograph and not on the preceding single-contrast images. Management was altered by the colonic findings in seven cases. False-positive findings occurred in two cases. CONCLUSIONS A routine overhead radiograph following use of the pneumocolon technique is a useful adjunct to small bowel meal examination as it can yield unsuspected and clinically significant colonic findings.Chou, S. (2000). Clinical Radiology55, 459-464.
Collapse
Affiliation(s)
- S Chou
- McMaster University Medical Centre, Department of Radiology, 1200 Main Street West, Hamilton, L8N 3Z5, Ontario, Canada
| | | | | | | | | |
Collapse
|
44
|
Choi YK, Brolin RE, Wagner BK, Chou S, Etesham S, Pollak P. Efficacy and safety of patient-controlled analgesia for morbidly obese patients following gastric bypass surgery. Obes Surg 2000; 10:154-9. [PMID: 10782177 DOI: 10.1381/096089200321668703] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Adequate postoperative pain control is important to reduce potential cardiopulmonary complications. It is often difficult to determine dosages of narcotics for morbidly obese patients following Roux-en-Y gastric bypass (RYGBP) due to respiratory depression. Individualization of analgesic therapy, patient-controlled analgesia (PCA), can provide optimal dosage for pain control and minimize the side-effects. METHOD 25 morbidly obese patients who received PCA with morphine sulfate following RYGBP. PCA settings we re as follows: morphine, 20 microg/kg of ideal body weight, 10-minute lock out interval and 80 % of a calculated amount for a 4-hour limit. W e measured arterial blood gas, heart rate, mean arterial pressure, arterial oxygen saturation, respiratory rate, opioid amount, patient satisfaction, visual analog pain scale (VAS), and the incidence of nausea, vomiting, pruritus and sedation. RESULTS Average morphine usage was 44.2+/-28.7 mg during the day of surgery (DOS); 49.1+/-27.4 mg during POD (postoperative day) #1; and 36.6+/-22.8 mg during POD#2 (p < 0.01). 24 patients were satisfied with their pain control on POD#1. VAS was 5.4+/-2.1 on the day of surgery, but remained below 4 thereafter. Arterial oxygen saturation and vital signs were maintained without significant changes. 5 patients experienced mild sedation on the day of surgery and 3 patients experienced mild sedation on POD#1. 1 patient experienced nausea and vomiting and 4 patients had pruritus; however, none required treatment. CONCLUSION PCA is safe and effective for morbidly obese patients following RYGBP.
Collapse
Affiliation(s)
- Y K Choi
- New Jersey Pain Institute, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ 08901 USA
| | | | | | | | | | | |
Collapse
|
45
|
Landry ML, Stanat S, Biron K, Brambilla D, Britt W, Jokela J, Chou S, Drew WL, Erice A, Gilliam B, Lurain N, Manischewitz J, Miner R, Nokta M, Reichelderfer P, Spector S, Weinberg A, Yen-Lieberman B, Crumpacker C. A standardized plaque reduction assay for determination of drug susceptibilities of cytomegalovirus clinical isolates. Antimicrob Agents Chemother 2000; 44:688-92. [PMID: 10681339 PMCID: PMC89747 DOI: 10.1128/aac.44.3.688-692.2000] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Twelve laboratories collaborated in formulating and testing a standardized plaque reduction assay for cytomegalovirus (CMV) cell-associated clinical isolates. Four characterized and plaque-purified CMV strains, as well as six coded clinical isolates obtained after antiviral therapy, were distributed and tested. Good agreement was obtained for four of the clinical isolates, but a broad distribution of results was obtained for two isolates. Analysis of these results indicates the problems associated with clinical isolates, including the large genetic variability and the highly cell-associated phenotype. This collaborative effort, by addressing these problems, represents a significant step toward the development of a standardized assay.
Collapse
Affiliation(s)
- M L Landry
- Yale University, New Haven, Connecticut, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Abstract
Cervical neuroblastoma (CNB) is relatively rare, accounting for less than 5% of these tumors. Because it arises from the cervical sympathetic chain, complete resection will leave the child with Horner's syndrome in a high proportion of cases. Advances in technology have allowed for the development of diagnostic and imaging modalities more specific to the disease. One of these has been the advent of radiolabeled meta-iodobenzylguanidine (MIBG) to assess the primary tumor and focal metastatic involvement. This nuclide is also taken up by normal salivary-gland tissue; this may be altered, however, in the presence of sympathetic denervation. We present a case of a primary CNB associated with Horner's syndrome, which led to confusion in interpretation of the subsequent MIBG scan. We alert the reader to potential pitfalls in the use of this examination in this disease entity.
Collapse
Affiliation(s)
- N L Yanchar
- Division of Pediatric General Surgery, Children's Hospital of Eastern Ontario, Ottawa, Canada
| | | |
Collapse
|
47
|
Chou S, Meichsner CL. A nine-codon deletion mutation in the cytomegalovirus UL97 phosphotransferase gene confers resistance to ganciclovir. Antimicrob Agents Chemother 2000; 44:183-5. [PMID: 10602745 PMCID: PMC89650 DOI: 10.1128/aac.44.1.183-185.2000] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A deletion mutation (codons 595 to 603) in the cytomegalovirus (CMV) UL97 gene was recently reported after sequence analysis of leukocyte DNA from a patient receiving ganciclovir. The corresponding viral phenotype was examined by transfer of this mutation to a laboratory CMV strain (strain Towne). The recombinant virus was resistant to ganciclovir (8.4-fold increase in the 50% inhibitory concentration), was sensitive to foscarnet, and replicated normally in cell culture.
Collapse
Affiliation(s)
- S Chou
- Medical and Research Services, Veterans Affairs Medical Center, Portland, Oregon 97201, USA.
| | | |
Collapse
|
48
|
Rosen HR, Lentz JJ, Rose SL, Rabkin J, Corless CL, Taylor K, Chou S. Donor polymorphism of tumor necrosis factor gene: relationship with variable severity of hepatitis C recurrence after liver transplantation. Transplantation 1999; 68:1898-902. [PMID: 10628771 DOI: 10.1097/00007890-199912270-00014] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Hepatitis C-related liver failure is the leading indication for liver transplantation worldwide. Although histologic recurrence is identified in the majority of patients, the spectrum of allograft injury is wide. To date, most studies have focused on the contribution of immunosuppression and viral factors. We hypothesized that the allograft plays a significant role in determining timing and severity of hepatitis C virus (HCV) recurrence. The purpose of this analysis was to determine if genetic polymorphisms of the tumor necrosis factor (TNF) locus were associated with the highly variable severity of HCV recurrence. METHODS Thirty-one HCV-seropositive liver transplant recipients with long-term follow-up were studied. Genomic DNA was extracted from archived donor spleens which corresponded to each patient. We performed polymerase chain reaction amplification, followed by sequencing for two promoter TNF-alpha variants (at positions -238 and -308), and restriction fragment length analysis for four polymorphic loci within the TNF-beta gene (NcoI, TNFc, aa13, and aa26). RESULTS The relative prevalence of polymorphisms corresponded to distributions previously reported in normal control populations. Twenty-two of 31 (71%) patients received a donor liver homozygous for the wild type allele (TNF1) at the -308 TNF-alpha promoter region. The interval to histologic recurrence was significantly shorter and severity of HCV allograft hepatitis was significantly greater in patients with one or two TNF308.2 alleles. At last follow-up biopsy, 5 of 9 (56%) patients with a TNF308.2 donor liver had evidence of severe histological activity index as compared to 2 of 22 (9%) of patients receiving a donor liver homozygous for the TNF1 allele (P = 0.01). There was no correlation between rejection rates and the presence of any TNF-alpha or TNF-beta alleles. TNF-beta polymorphisms within the donor liver did not correlate with severity of HCV recurrence. CONCLUSIONS The donor TNF-alpha promoter genotype may influence the inflammatory response to HCV reinfection of the graft and contribute to accelerated graft injury. If the association between this genetic marker (TNF308.2) and disease progression is confirmed, it could improve our understanding of HCV pathogenesis and influence donor selection and patient management.
Collapse
Affiliation(s)
- H R Rosen
- Department of Medicine, Portland Veterans Affairs Medical Center and Oregon Health Sciences University, USA
| | | | | | | | | | | | | |
Collapse
|
49
|
Abstract
The general transcription factor IIA (TFIIA) forms a complex with TFIID at the TATA promoter element, and it inhibits the function of several negative regulators of the TATA-binding protein (TBP) subunit of TFIID. Biochemical experiments suggest that TFIIA is important in the response to transcriptional activators because activation domains can interact with TFIIA, increase recruitment of TFIID and TFIIA to the promoter, and promote isomerization of the TFIID-TFIIA-TATA complex. Here, we describe a double-shut-off approach to deplete yeast cells of Toa1, the large subunit of TFIIA, to <1% of the wild-type level. Interestingly, such TFIIA-depleted cells are essentially unaffected for activation by heat shock factor, Ace1, and Gal4-VP16. However, depletion of TFIIA causes a general two- to threefold decrease of transcription from most yeast promoters and a specific cell-cycle arrest at the G2-M boundary. These results indicate that transcriptional activation in vivo can occur in the absence of TFIIA.
Collapse
Affiliation(s)
- S Chou
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | | | | | | |
Collapse
|
50
|
Rosen HR, Hinrichs DJ, Gretch DR, Koziel MJ, Chou S, Houghton M, Rabkin J, Corless CL, Bouwer HG. Association of multispecific CD4(+) response to hepatitis C and severity of recurrence after liver transplantation. Gastroenterology 1999; 117:926-32. [PMID: 10500076 DOI: 10.1016/s0016-5085(99)70352-5] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND & AIMS After liver transplantation for hepatitis C virus (HCV), reinfection of the allograft invariably occurs. Indirect evidence suggests that the cellular immune response may play a central role. The purpose of this analysis was to determine the correlation between HCV-specific peripheral CD4(+) T-cell responses and the severity of recurrence after liver transplantation. METHODS Fifty-eight HCV-seropositive patients, including 43 liver transplant recipients with at least 1 year of histological follow-up, were studied. Peripheral blood mononuclear cells (PBMCs) were isolated from fresh heparinized blood and stimulated with either recombinant HCV antigens (core, E2, NS3, NS4, and NS5) or control antigens. RESULTS Fourteen (40%) of 35 patients with mild or no evidence of histological recurrence within their allografts responded to at least 1 of the HCV antigens. Eleven responded to NS3, 5 to all the nonstructural antigens, and 3 to the HCV core polypeptide alone. In contrast, in the 8 patients with severe HCV recurrence, no proliferation in response to any of the HCV antigens was seen (P = 0. 03) despite responses to the control antigens. CONCLUSIONS Despite immunosuppression, HCV-specific, major histocompatibility complex class II- restricted CD4(+) T-cell responses are detectable in patients with minimal histological recurrence after liver transplantation. In contrast, PBMCs from patients with severe HCV recurrence, despite being able to proliferate in response to non-HCV antigens, fail to respond to the HCV antigens. These findings suggest that the inability to generate virus-specific T-cell responses plays a contributory role in the pathogenesis of HCV-related graft injury after liver transplantation. It is hoped that further characterization of the immunoregulatory mechanisms related to recurrent HCV will provide the rationale for novel therapeutic strategies and diminish the incidence of inevitable graft loss.
Collapse
Affiliation(s)
- H R Rosen
- Department of Medicine, Portland Veterans Affairs Medical Center/Oregon Health Sciences University, Portland, Oregon.
| | | | | | | | | | | | | | | | | |
Collapse
|