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Chen RJ, Ding T, Lu MY, Williamson DFK, Jaume G, Song AH, Chen B, Zhang A, Shao D, Shaban M, Williams M, Oldenburg L, Weishaupt LL, Wang JJ, Vaidya A, Le LP, Gerber G, Sahai S, Williams W, Mahmood F. Towards a general-purpose foundation model for computational pathology. Nat Med 2024; 30:850-862. [PMID: 38504018 DOI: 10.1038/s41591-024-02857-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 02/05/2024] [Indexed: 03/21/2024]
Abstract
Quantitative evaluation of tissue images is crucial for computational pathology (CPath) tasks, requiring the objective characterization of histopathological entities from whole-slide images (WSIs). The high resolution of WSIs and the variability of morphological features present significant challenges, complicating the large-scale annotation of data for high-performance applications. To address this challenge, current efforts have proposed the use of pretrained image encoders through transfer learning from natural image datasets or self-supervised learning on publicly available histopathology datasets, but have not been extensively developed and evaluated across diverse tissue types at scale. We introduce UNI, a general-purpose self-supervised model for pathology, pretrained using more than 100 million images from over 100,000 diagnostic H&E-stained WSIs (>77 TB of data) across 20 major tissue types. The model was evaluated on 34 representative CPath tasks of varying diagnostic difficulty. In addition to outperforming previous state-of-the-art models, we demonstrate new modeling capabilities in CPath such as resolution-agnostic tissue classification, slide classification using few-shot class prototypes, and disease subtyping generalization in classifying up to 108 cancer types in the OncoTree classification system. UNI advances unsupervised representation learning at scale in CPath in terms of both pretraining data and downstream evaluation, enabling data-efficient artificial intelligence models that can generalize and transfer to a wide range of diagnostically challenging tasks and clinical workflows in anatomic pathology.
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Affiliation(s)
- Richard J Chen
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Tong Ding
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Ming Y Lu
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
| | - Drew F K Williamson
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
| | - Guillaume Jaume
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Andrew H Song
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Bowen Chen
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Andrew Zhang
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Health Sciences and Technology, Harvard-MIT, Cambridge, MA, USA
| | - Daniel Shao
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Health Sciences and Technology, Harvard-MIT, Cambridge, MA, USA
| | - Muhammad Shaban
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Mane Williams
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Lukas Oldenburg
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Luca L Weishaupt
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Health Sciences and Technology, Harvard-MIT, Cambridge, MA, USA
| | - Judy J Wang
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Anurag Vaidya
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Health Sciences and Technology, Harvard-MIT, Cambridge, MA, USA
| | - Long Phi Le
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Health Sciences and Technology, Harvard-MIT, Cambridge, MA, USA
| | - Georg Gerber
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Sharifa Sahai
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Systems Biology, Harvard University, Cambridge, MA, USA
| | - Walt Williams
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Faisal Mahmood
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
- Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA.
- Cancer Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA.
- Harvard Data Science Initiative, Harvard University, Cambridge, MA, USA.
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Chen RJ, Ding T, Lu MY, Williamson DFK, Jaume G, Chen B, Zhang A, Shao D, Song AH, Shaban M, Williams M, Vaidya A, Sahai S, Oldenburg L, Weishaupt LL, Wang JJ, Williams W, Le LP, Gerber G, Mahmood F. A General-Purpose Self-Supervised Model for Computational Pathology. ArXiv 2023:arXiv:2308.15474v1. [PMID: 37693180 PMCID: PMC10491320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Tissue phenotyping is a fundamental computational pathology (CPath) task in learning objective characterizations of histopathologic biomarkers in anatomic pathology. However, whole-slide imaging (WSI) poses a complex computer vision problem in which the large-scale image resolutions of WSIs and the enormous diversity of morphological phenotypes preclude large-scale data annotation. Current efforts have proposed using pretrained image encoders with either transfer learning from natural image datasets or self-supervised pretraining on publicly-available histopathology datasets, but have not been extensively developed and evaluated across diverse tissue types at scale. We introduce UNI, a general-purpose self-supervised model for pathology, pretrained using over 100 million tissue patches from over 100,000 diagnostic haematoxylin and eosin-stained WSIs across 20 major tissue types, and evaluated on 33 representative CPath clinical tasks in CPath of varying diagnostic difficulties. In addition to outperforming previous state-of-the-art models, we demonstrate new modeling capabilities in CPath such as resolution-agnostic tissue classification, slide classification using few-shot class prototypes, and disease subtyping generalization in classifying up to 108 cancer types in the OncoTree code classification system. UNI advances unsupervised representation learning at scale in CPath in terms of both pretraining data and downstream evaluation, enabling data-efficient AI models that can generalize and transfer to a gamut of diagnostically-challenging tasks and clinical workflows in anatomic pathology.
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Lipkova J, Chen RJ, Chen B, Lu MY, Barbieri M, Shao D, Vaidya AJ, Chen C, Zhuang L, Williamson DFK, Shaban M, Chen TY, Mahmood F. Artificial intelligence for multimodal data integration in oncology. Cancer Cell 2022; 40:1095-1110. [PMID: 36220072 PMCID: PMC10655164 DOI: 10.1016/j.ccell.2022.09.012] [Citation(s) in RCA: 74] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 07/12/2022] [Accepted: 09/15/2022] [Indexed: 02/07/2023]
Abstract
In oncology, the patient state is characterized by a whole spectrum of modalities, ranging from radiology, histology, and genomics to electronic health records. Current artificial intelligence (AI) models operate mainly in the realm of a single modality, neglecting the broader clinical context, which inevitably diminishes their potential. Integration of different data modalities provides opportunities to increase robustness and accuracy of diagnostic and prognostic models, bringing AI closer to clinical practice. AI models are also capable of discovering novel patterns within and across modalities suitable for explaining differences in patient outcomes or treatment resistance. The insights gleaned from such models can guide exploration studies and contribute to the discovery of novel biomarkers and therapeutic targets. To support these advances, here we present a synopsis of AI methods and strategies for multimodal data fusion and association discovery. We outline approaches for AI interpretability and directions for AI-driven exploration through multimodal data interconnections. We examine challenges in clinical adoption and discuss emerging solutions.
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Affiliation(s)
- Jana Lipkova
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Richard J Chen
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Bowen Chen
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Department of Computer Science, Harvard University, Cambridge, MA, USA
| | - Ming Y Lu
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
| | - Matteo Barbieri
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Daniel Shao
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Harvard-MIT Health Sciences and Technology (HST), Cambridge, MA, USA
| | - Anurag J Vaidya
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Harvard-MIT Health Sciences and Technology (HST), Cambridge, MA, USA
| | - Chengkuan Chen
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Luoting Zhuang
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA
| | - Drew F K Williamson
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Muhammad Shaban
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Tiffany Y Chen
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Faisal Mahmood
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Cancer Program, Broad Institute of Harvard and MIT, Cambridge, MA, USA; Data Science Program, Dana-Farber Cancer Institute, Boston, MA, USA; Harvard Data Science Initiative, Harvard University, Cambridge, MA, USA.
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ZHANG Y, Ghiringhelli Borsa N, Goodfellow R, Dunlop H, Meyer N, Shao D, Jones M, Pitcher G, Taylor A, Nester C, Smith R. POS-024 COMPLEMENT FACTOR I VARIANTS IN ATYPICAL HEMOLYTIC UREMIC SYNDROME AND C3 GLOMERULOPATHY. Kidney Int Rep 2022. [DOI: 10.1016/j.ekir.2022.04.044] [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: 10/18/2022] Open
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Zhang J, Su GH, Zhang XD, Xu K, Wang ZM, Deng XL, Zhu YQ, Chen YJ, Gao CZ, Xie H, Pan X, Yin L, Xu BH, Fei W, Zhou J, Shao D, Zhang ZH, Zhang K, Wang X, Cheng X, Wang X, Chen LL. [Consensus of experts on the medical risk prevention for the patients with cardiovascular diseases during dental treatment (2022 edition)]. Zhonghua Kou Qiang Yi Xue Za Zhi 2022; 57:462-473. [PMID: 35484668 DOI: 10.3760/cma.j.cn112144-20220311-00102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
With the aging process of population in the society, the prevalence of cardiovascular diseases (CVD) in China is increasing continuously and the number of dental patients with CVD is increasing gradually too. Due to the lack of guidelines for dental patients with CVD in our country, how to implement standardized preoperative evaluation and perioperative risk prevention remains a problem to be solved for dentists at present. The present expert consensus was reached by combining the clinical experiences of the expert group of the Fifth General Dentistry Special Committee, Chinese Stomatological Association and respiratory and cardiology experts in diagnosis and treatment for CVD patients, and by systematically summarizing the relevant international guidelines and literature regarding the relationship between CVD and oral diseases and the diagnosis and treatment of dental patients with heart failure, hypertension and antithrombotic therapy. The consensus aims to provide, for the dental clinicians, the criteria on diagnosis and treatment of CVD in dental patients in China so as to reduce the risk and complications, and finally to improve the treatment levels of dental patients with CVD in China.
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Affiliation(s)
- J Zhang
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - G H Su
- Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - X D Zhang
- Department of Stomatology, General Hospital of Northern Theater Command, Shenyang 110016, China
| | - K Xu
- Department of Cardiology, General Hospital of Northern Theater Command, Shenyang 110016, China
| | - Z M Wang
- Department of Stomatology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, China
| | - X L Deng
- Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Y Q Zhu
- Department of General Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine & College of Stomatology, Shanghai Jiao Tong University & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Shanghai Key Laboratory of Stomatology, Shanghai 200011, China
| | - Y J Chen
- Department of General Dentistry & Emergency, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Xi'an 710032, China
| | - C Z Gao
- Department of Stomatology, Peking University People's Hospital, Beijing 100044, China
| | - H Xie
- Department of Stomatology, The People's Hospital of Liaoning Province, Shenyang 110016, China
| | - X Pan
- The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou 510080, China
| | - L Yin
- Department of Stomatology, The First Affiliated Hospital With Nanjing Medical University, Nanjing 210029, China
| | - B H Xu
- Department of Stomatology, China-Japan Friendship Hospital, Beijing 100029, China
| | - W Fei
- Department of Stomatology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China
| | - J Zhou
- Department of VIP Dental Service, Capital Medical University School of Stomatology, Beijing 100050, China
| | - D Shao
- Department of Stomatology, Qingdao West Coast New Area Central Hospital, Qingdao 266555, China
| | - Z H Zhang
- Center of Stomatology, The First Affiliated Hospital of USTC (Anhui Provincial Hospital), Hefei 230001, China
| | - K Zhang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical College, Bengbu 233000, China
| | - X Wang
- Department of Cardiology, Guangdong Province Traditional Chinese Medical Hospital, Guangzhou 510120, China
| | - X Cheng
- Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - X Wang
- Department of Stomatology, Peking University Third Hospital, Beijing 100191, China
| | - L L Chen
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
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Jin H, Xu X, Pang B, Yang R, Sun H, Jiang C, Shao D, Shi J. Probiotic and prebiotic interventions for non-alcoholic fatty liver disease: a systematic review and network meta-analysis. Benef Microbes 2021; 12:517-529. [PMID: 34511051 DOI: 10.3920/bm2020.0183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Many studies have associated altered intestinal bacterial communities and non-alcoholic fatty liver disease, but the putative effects are inconclusive. The purpose of this network meta-analysis (NMA) was to evaluate the effects of probiotics, prebiotics, and synbiotics on non-alcoholic fatty liver disease through randomised intervention trials. Literature searches were performed until March 2020. For each outcome, a random NMA was performed, the surface under the cumulative ranking curve (SUCRA) was determined. A total of 22 randomised trials comparing prebiotic, probiotic, and synbiotic treatments included 1301 participants. Considering all seven results (aspartate aminotransferase, alanine aminotransferase, body mass index, weight, total cholesterol, high-density lipoprotein cholesterol, and low-density lipoprotein cholesterol) together, the highest SUCRA values are probiotics (94%), synbiotics (61%) and prebiotics (56%), respectively. NMA results provide evidence that probiotics, prebiotics, and synbiotics can alleviate non-alcoholic fatty liver disease. However, due to the lack of high-quality randomised trials, this research also has some limitations.
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Affiliation(s)
- H Jin
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
| | - X Xu
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
| | - B Pang
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
| | - R Yang
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
| | - H Sun
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R.,School of Hospitality Management, Guilin Tourism University, 26 Liangfeng Road, Yanshan District, Guilin City, Guangxi Province 541006, China P.R
| | - C Jiang
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
| | - D Shao
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
| | - J Shi
- A Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi Province 710072, China P.R
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Shao D, Zhao ZN, Zhang YQ, Zhou XY, Zhao LB, Dong M, Xu FH, Xiang YJ, Luo HY. Efficacy of repetitive transcranial magnetic stimulation for post-stroke depression: a systematic review and meta-analysis of randomized clinical trials. Braz J Med Biol Res 2021; 54:e10010. [PMID: 33470386 PMCID: PMC7812912 DOI: 10.1590/1414-431x202010010] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 09/16/2020] [Indexed: 11/21/2022] Open
Abstract
We aimed to conduct a meta-analysis to evaluate the efficacy of repetitive transcranial magnetic stimulation (rTMS) in patients with post-stroke depression (PSD). Six relevant electronic databases (PubMed, CENTRAL, Embase, Web of Science, CINAHL, and PsycINFO) were searched. Randomized controlled trials (RCTs) that compared rTMS with control condition for PSD were included. The mean change in depression symptom scores was defined as the primary efficacy outcome. Secondary outcomes included the remission rate of depression, stroke recovery, and cognitive function recovery. In total, 7 RCTs with 351 participants were included. At post-treatment, rTMS was significantly more effective than the control condition, with a standardized mean difference (SMD) of -1.15 (95%CI: -1.62 to -0.69; P<0.001, I2=71%) and remission with an odds ratio (OR) of 3.46 (95%CI: 1.68 to 7.12; P<0.001; I2=11%). As for stroke recovery, rTMS was also better than the control condition (SMD=-0.67, 95%CI: -1.02 to -0.32; P<0.001). However, no significant difference was found for cognitive function recovery between the two groups (SMD=4.07, 95%CI: -1.41 to 9.55; P=0.15). To explore the potential moderators for the primary outcome, a series of subgroup and sensitivity analyses were performed. The results implied that rTMS may be more effective in Asian samples than in North American samples (P=0.03). In conclusion, from the current evidence in this study, rTMS could be an effective treatment for patients with PSD. Further clinical studies with larger sample sizes and clearer subgroup definitions are needed to confirm these outcomes.
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Affiliation(s)
- D Shao
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Yuzhong District, Chongging, China
| | - Z N Zhao
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical and Pharmaceutical College, Chongqing, China
| | - Y Q Zhang
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Yuzhong District, Chongging, China
| | - X Y Zhou
- Department of Psychiatry, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - L B Zhao
- Department of Neurology, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - M Dong
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Yuzhong District, Chongging, China
| | - F H Xu
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Yuzhong District, Chongging, China
| | - Y J Xiang
- Department of Psychiatry, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - H Y Luo
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Yuzhong District, Chongging, China
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Qiu Y, Shao D, Liu L, Lin Y, Wu K, He J. 407P Integrating histologic and genomic characteristics to predict tumour mutation burden of early-stage non-small cell lung cancer. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.10.401] [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: 11/28/2022] Open
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Li L, Zhu C, Shao D, Wu M. Real-world evidence on clinical value of germline alterations of cancer predisposition genes in Chinese epithelial ovarian cancer. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.05.198] [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: 10/23/2022]
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Shao D, Zhu C, Guo F. Prevalence of hereditary breast and ovarian cancer predisposition gene mutations among 882 HBOC high-risk Chinese individuals. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.05.457] [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: 11/25/2022]
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Xu X, Qu R, Wu W, Jiang C, Shao D, Shi J. Applications of microbial co-cultures in polyketides production. J Appl Microbiol 2020; 130:1023-1034. [PMID: 32897644 DOI: 10.1111/jam.14845] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 05/29/2020] [Revised: 07/28/2020] [Accepted: 08/31/2020] [Indexed: 12/21/2022]
Abstract
Polyketides are a large group of natural biomolecules that are normally produced by bacteria, fungi and plants. These molecules have clinical importance due to their anti-cancer, anti-microbial, anti-oxidant and anti-inflammatory properties. Polyketides are biosynthesized from units of acyl-CoA by different polyketide synthases (PKSs), which display wide diversity of functional domains and mechanisms of action between fungi and bacteria. Co-culture of different micro-organisms can produce novel products distinctive from those produced during single cultures. This study compared the new polyketides produced in such co-culture systems and discusses aspects of the cultivation systems, product structures and identification techniques. Current results indicate that the formation of new polyketides may be the result of activation of previously silent PKSs genes induced during co-culture. This review indicated a potential way to produce pure therapeutic polyketides by microbial fermentation and a potential way to develop functional foods and agricultural products using co-co-culture of different micro-organisms. It also pointed out a new perspective for studies on the process of functional foods, especially those involving multiple micro-organisms.
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Affiliation(s)
- X Xu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
| | - R Qu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
| | - W Wu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
| | - C Jiang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
| | - D Shao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
| | - J Shi
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
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12
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Xia H, Chen L, Shao D, Liu X, Wang Q, Zhu F, Guo Z, Gao L, Chen K. Vacuolar protein sorting 4 is required for silkworm metamorphosis. Insect Mol Biol 2019; 28:728-738. [PMID: 30955208 DOI: 10.1111/imb.12586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Vacuolar protein sorting 4 (Vps4) not only functions with its positive regulator vacuolar protein sorting 20-associated 1 (Vta1) in the multivesicular body (MVB) pathway but also participates alone in MVB-unrelated cellular processes. However, its physiological roles at the organism level remain rarely explored. We previously identified their respective homologues Bombyx mori Vps4 (BmVps4) and BmVta1 from the silkworm, a model organism for insect research. In this study, we performed fluorescence quantitative real-time PCR and Western blot to globally characterize the transcription and protein expression profiles of BmVps4 and BmVta1 during silkworm development and in different silkworm tissues and organs. The results showed that they were significantly up-regulated in metamorphosis, adulthood and embryogenesis relative to larval stages, and displayed a roughly similar tissue-and-organ specificity for transcriptions in silkworm larvae. Importantly, BmVps4 was down-regulated during the early period of the fifth instar, reaching the lowest level of transcription on Day 6, then up-regulated from Day 7 to the wandering, spinning and pupal stages, and down-regulated again in adulthood. Moreover, knocking down BmVps4 by RNA interference significantly inhibited silk gland growth, shortened spinning time, prolonged pupation, reduced pupal size and weight, and increased moth wing defects. Together, our data demonstrate the critical and broad requirements for BmVps4 in silkworm metamorphosis.
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Affiliation(s)
- H Xia
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - L Chen
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - D Shao
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - X Liu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - Q Wang
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - F Zhu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - Z Guo
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - L Gao
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
| | - K Chen
- Institute of Life Sciences, Jiangsu University, Zhenjiang, China
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Liu J, Shao D, Cheng S, Guo F, Yuan Y, Hu K, Wang Z, Meng X, Jin X, Yun X, Chai X, Li H, Zhang Y, Zhang H, Ye M. Frequency of mutations in 21 hereditary breast and ovarian cancer susceptibility genes among 882 high-risk individuals. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz250.018] [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
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Zhu C, Li L, Shao D, Lang J, Ma S, Tan X, Zhong S, Wu M. A multi-center integrative study on cancer predisposition genes in Chinese patients with epithelial ovarian carcinoma. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz250.020] [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
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15
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Xiao YQ, Shao D, Sheng ZW, Wang Q, Shi SR. A mixture of daidzein and Chinese herbs increases egg production and eggshell strength as well as blood plasma Ca, P, antioxidative enzymes, and luteinizing hormone levels in post-peak, brown laying hens. Poult Sci 2019; 98:3298-3303. [PMID: 30993323 DOI: 10.3382/ps/pez178] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 12/07/2018] [Accepted: 03/15/2019] [Indexed: 11/20/2022] Open
Abstract
Dietary supplementation with the isoflavone, daidzein, has been shown to improve egg production in poultry. Additionally, providing Chinese herbs (CH) in the broiler diet has led to increased antioxidative enzyme activity. However, the combined effect of these dietary supplements on hen performance has not been examined. Therefore, the objective of this study was to determine if dietary supplementation with a mixture of daidzein and CH would alter laying performance, egg quality, and blood plasma constituents of post-peak laying hens. At 59 wk of age, Hyline brown hens (240) were randomly allocated to 2 dietary groups and fed for 16 wk. The control group received the basal diet, and a treatment group was fed the basal diet that contained 0.02% of a mixture of daidzein and CH. Egg production and weight were recorded daily and egg quality data were collected at 75 wk of age. Blood plasma antioxidant activity, hormone levels, mineral (Ca and P) content, and osteocalcin content were determined at the end of the study. The results showed that laying rate, egg mass, and shell strength were greater in the daidzein-CH mixture group than the controls (P < 0.05). The plasma glutathione peroxidase, superoxide dismutase, and luteinizing hormone levels were also greater in the daidzein-CH mixture group compared with the control group (P < 0.05). The results of this study reveal that supplementing diets with a daidzein-CH mixture can improve laying performance perhaps by increasing plasma antioxidant activity, luteinizing hormone levels, and mineral content.
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Affiliation(s)
- Y Q Xiao
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu, 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry institute), Ministry of Agriculture, Yangzhou, Jiangsu, 225125, China
| | - D Shao
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu, 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry institute), Ministry of Agriculture, Yangzhou, Jiangsu, 225125, China
| | - Z W Sheng
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu, 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry institute), Ministry of Agriculture, Yangzhou, Jiangsu, 225125, China
| | - Q Wang
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu, 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry institute), Ministry of Agriculture, Yangzhou, Jiangsu, 225125, China
| | - S R Shi
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu, 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry institute), Ministry of Agriculture, Yangzhou, Jiangsu, 225125, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225125, China
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Li L, Meng X, Lin C, Shao D, Xiong Y, Wu M. The somatic and germline mutation pattern of 21 hereditary ovarian cancer genes in 62 Chinese ovarian cancers. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.632] [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: 10/26/2022]
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17
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Xiao YQ, Shao D, Tong HB, Shi SR. Genistein increases progesterone secretion by elevating related enzymes in chicken granulosa cells. Poult Sci 2019; 98:1911-1917. [PMID: 30239854 DOI: 10.3382/ps/pey411] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 04/25/2018] [Accepted: 08/08/2018] [Indexed: 12/24/2022] Open
Abstract
Genistein, a biologically active isoflavone, exists in many soy products. It is well known that genistein binds to both oestrogen receptor alpha (ERα) and oestrogen receptor beta (ERβ), but it has a higher affinity to ERβ. Genistein can also bind to the G protein-coupled receptor 30 (GPR30, also known as G protein-coupled oestrogen receptor 1 or GPER). Furthermore, weak oestrogenic activity has been found in genistein, but the mechanism of action remains unknown. The aim of this study was to investigate the in vitro effects of genistein on the secretion of progesterone (P4) and oestradiol (E2) in chicken granulosa cells harvested from follicles, as well as the mRNA expression of ERs in these cells. In addition, we examined the expression of key enzymes including steroidogenic acute regulatory protein (StAR), cytochrome P450 side-chain cleavage (P450scc), and 3β-hydroxysteroid dehydrogenase (3β-HSD) in the process of P4 synthesis. The results showed that genistein did not affect the viability of granulosa cells, nor was the proliferating cell nuclear antigen (PCNA) protein changed. Among the 1-, 10-, 100-, and 1,000-nM concentrations tested, treatment with 1 nM genistein for 48 h significantly increased P4 but did not affect E2 secretion. Real-time PCR results showed that the ERβ gene expression in granulosa cells was markedly upregulated by 1 nM genistein treatment for 48 h, but there was no significant difference in ERα and GPR30 expression. Genistein also increased the gene expression of StAR, P450scc and 3β-HSD in the cultured granulosa cells. These results indicate that genistein acts directly on chicken granulosa cells to increase P4 production by upregulating the gene expression of key enzymes through binding in ERβ. It may exert positive effects on the reproduction of late-laying hens and act as an effective and safe feed additive for animals.
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Affiliation(s)
- Y Q Xiao
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry Institute), Ministry of Agriculture, Yangzhou, Jiangsu 225125, China
| | - D Shao
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry Institute), Ministry of Agriculture, Yangzhou, Jiangsu 225125, China
| | - H B Tong
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry Institute), Ministry of Agriculture, Yangzhou, Jiangsu 225125, China
| | - S R Shi
- Poultry Institute, Chinese Academy of Agriculture Science, Yangzhou, Jiangsu 225125, China.,Institute of Effective Evaluation of Feed and Feed Additive (Poultry Institute), Ministry of Agriculture, Yangzhou, Jiangsu 225125, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu 225000, China
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18
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Ng CH, Kato T, Han C, Wang G, Trivedi M, Ramesh V, Shao D, Gala S, Narayanan S, Tan W, Feng Y, Kasper S. Definition of treatment-resistant depression - Asia Pacific perspectives. J Affect Disord 2019; 245:626-636. [PMID: 30445388 DOI: 10.1016/j.jad.2018.11.038] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/07/2018] [Accepted: 11/03/2018] [Indexed: 01/25/2023]
Abstract
BACKGROUND The lack of uniformity in the definition of treatment resistant depression (TRD) within the Asia-Pacific (APAC) region may have implications for patient management. We aimed to characterize the most commonly used TRD definition in selected APAC countries. METHODS A systematic literature review of TRD definitions in APAC countries was conducted in Medline and Embase (2010-2016) and conference proceedings (2014 and 2016). TRD guidelines (APAC, Europe regional, US, or international) were also searched. An expert-panel explored APAC nuances in TRD definitions to achieve consensus for a regional-level definition. RESULTS Ten guidelines and 89 studies qualified for study inclusion. Among the studies, variations were observed in definitions regarding: number of antidepressants failed (range: ≥1 to ≥3), classes of antidepressants (same or different; 59% did not specify class), duration of previous treatments (range: 4-12 weeks), dosage adequacy, and consideration of adherence (yes/no; 88% of studies did not consider adherence). No TRD-specific guidelines were identified. The emerging consensus from the literature review and panel discussion was that TRD is most commonly defined as failure to ≥2 antidepressant therapies given at adequate doses, for 6-8 weeks during a major depressive episode. LIMITATIONS Few studies provided definitions of TRD used in daily clinical practice, and a limited number of countries were represented in the included studies and expert panel. CONCLUSION Attaining consensus on TRD definition may promote accurate, and possibly early detection of patients with TRD to enable appropriate intervention that may impact patient outcomes and quality of life.
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Affiliation(s)
- C H Ng
- Department of Psychiatry, University of Melbourne, Victoria, Australia
| | - T Kato
- RIKEN Brain Science Institute, Saitama, Japan
| | - C Han
- Korea University, Seoul, South Korea
| | - G Wang
- Capital Medical University, Anding Hospital, Beijing, China
| | - M Trivedi
- University of Texas Southwestern Medical Center, TX, US
| | - V Ramesh
- Market Access Solutions, LLC, USA
| | - D Shao
- Market Access Solutions, LLC, USA
| | - S Gala
- Market Access Solutions, LLC, USA
| | | | - W Tan
- Janssen Asia Pacific, Singapore
| | - Y Feng
- Janssen Asia Pacific, Singapore
| | - S Kasper
- Medical University of Vienna, Vienna, Austria
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Li J, Riaz Rajoka MS, Shao D, Jiang C, Jin M, Huang Q, Yang H, Shi J. Strategies to increase the efficacy of using gut microbiota for the modulation of obesity. Obes Rev 2017; 18:1260-1271. [PMID: 28742949 DOI: 10.1111/obr.12590] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 06/03/2017] [Accepted: 06/12/2017] [Indexed: 12/16/2022]
Abstract
Obesity is one of the most serious global public health challenges of the 21st century. The adjustment of gut microbiota is often recommended as an efficient strategy to treat obesity. This modulation of gut microbiota can be performed by many methods, including dietary intervention, antibiotic application, the use of prebiotics and probiotics, bariatric surgery and faecal microbiota transplantation. In most cases, positive effects have been observed in response to treatment, but invalid and even contrary effects have also been observed in some cases due to factors that are unrelated to intervention methods, such as genetic factors, patient age or gender, environmental microbiota, climate, geography and lifestyle. These factors can cause variation of gut microbial populations and thus should also be taken into consideration when selecting modulation strategies.
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Affiliation(s)
- J Li
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - M S Riaz Rajoka
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - D Shao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - C Jiang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - M Jin
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - Q Huang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - H Yang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
| | - J Shi
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Shaanxi, People's Republic of China
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20
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Liu J, Shao D, Lin Y, Luo M, Wang Z, Yao M, Hao X, Wei C, Gao Y, Deng W, Wang H. PyMIF enhances the inflammatory response in a rodent model by stimulating CD11b(+) Ly6C(+) cells accumulation in spleen. Parasite Immunol 2017; 38:377-83. [PMID: 27028001 DOI: 10.1111/pim.12320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Accepted: 03/24/2016] [Indexed: 11/29/2022]
Abstract
Macrophage migration inhibitory factor (PMIF) expressed by Plasmodium parasites has been proved to be similar to the mammalian MIF in both structure and biological activity and is a critical upstream regulator in antimalaria innate immunity. In this work, using a genetically modified (MIF-KO) strain of highly lethal rodent Plasmodium yoelii 17XL (Py17XL), we found that PyMIF could increase the secretion of pro-inflammatory factors by eliciting the CD11b(+) Ly6C(+) cells accumulated in the spleen of infected mouse. In addition, the chemotactic effect of PyMIF was demonstrated to associate with cell receptors CXCR2, CXCR4 and the cell surface markers ICAM-1, LFA-4.
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Affiliation(s)
- J Liu
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - D Shao
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - Y Lin
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - M Luo
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - Z Wang
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - M Yao
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - X Hao
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - C Wei
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - Y Gao
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - W Deng
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
| | - H Wang
- Laboratory of Parasitology, Institute of Basic Medical Sciences / Institute of Pathogen Biology, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing, China
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Garfield BE, Shao D, Parfitt L, Harries C, Price L, Dimopoulos K, Polkey MI, Kemp P, Wort SJ. S108 Low skeletal muscle strength and physical activity are associated with poor outcomes in pulmonary arterial hypertension. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.114] [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: 11/04/2022]
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Garfield B, Shao D, Crosby A, Yang P, Morrell N, Polkey M, Kemp P, Wort SJ. P268 The role of growth and differentiation factor 15 in smooth muscle cell proliferation in pulmonary hypertension. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.404] [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: 11/04/2022]
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23
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Shao D, Garfied BE, Crosby A, Young P, Perros F, Humbert M, Adcock IM, Morrell N, Wort SJ. S6 The profiles of JMJD3, UTX and H3K27me3 expression in pulmonary vasculature in rat MCT model of PAH and human iPAH: implications for pulmonary arterial hypertension. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.12] [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: 11/03/2022]
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Tong HB, Cai J, Lu J, Wang Q, Shao D, Zou JM. Effects of outdoor access days on growth performance, carcass yield, meat quality, and lymphoid organ index of a local chicken breed. Poult Sci 2015; 94:1115-21. [PMID: 25838315 DOI: 10.3382/ps/pev032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/25/2014] [Indexed: 11/20/2022] Open
Abstract
An experiment was conducted to evaluate the effect of outdoor access days on growth performance, carcass yield, meat quality, and lymphoid organ index of a local chicken breed. In total, 864 twenty one-day-old male Suqin yellow chickens, with similar body weight (536±36g), were selected and raised in indoor floor pens that measured 1.42×1.42 m (2 m2, 18 birds/m2) in conventional poultry research houses (36 birds per pen). Two hundred and sixteen birds were allowed outdoor access treatments at 21, 28, 35, and 42 d of age, respectively (access to outdoor for 35, 28, 21, and 14 days, respectively). Each treatment was represented by 6 replicates (pens) containing 36 birds (216 birds per treatment). In the outdoor access treatment, the birds had an outdoor free-range paddock that measured 3×8 m (24 m2, 1.5 birds/m2). The body weight of birds at 56 d of age increased linearly with increasing outdoor access days (P<0.001), but there was no effect of the outdoor access days on the body weight at 42 d of age (P=0.161). The daily weight gain, daily feed intake, and feed per gain from 21 to 42 d of age were unaffected by outdoor access days (P=0.401, P=0.463, P=0.223, respectively). However, the daily weight gain and daily feed intake from 42 to 56 and from 21 to 56 d of age increased linearly with increasing outdoor access days (P=0.002, P<0.001; P=0.001, P=0.004; respectively), while the feed per gain tended to decrease linearly from 21 to 56 d of age (P=0.060). The mortality from 21 to 56 d of age was unaffected by outdoor access days (P=0.261). At 56 d of age, the breast yield increased linearly with increasing outdoor access days (P<0.001), while the foot yield decreased linearly (P=0.016). The light (L*) and red (b*) values of leg meat color increased linearly with increasing outdoor access days (P=0.032, P=0.013, respectively). The spleen: the body weight ratio showed a decreasing and then increasing quadratic response to increasing outdoor access days (P=0.047). The litter moisture content at 42 and 56 d of age increased linearly with increasing outdoor access days (P<0.001, P=0.013, respectively). The findings of this study suggest that increasing outdoor access days advantageously affects the body weight, daily weight gain, feed per gain and breast yield as well as the light (L*) and red (b*) values of leg meat color, while decreasing foot yield.
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Affiliation(s)
- H B Tong
- Poultry Institute, Chinese Academy of Agricultural Sciences, 225125 Yangzhou, Jiangsu, P. R. China
| | - J Cai
- Poultry Institute, Chinese Academy of Agricultural Sciences, 225125 Yangzhou, Jiangsu, P. R. China
| | - J Lu
- Poultry Institute, Chinese Academy of Agricultural Sciences, 225125 Yangzhou, Jiangsu, P. R. China
| | - Q Wang
- Poultry Institute, Chinese Academy of Agricultural Sciences, 225125 Yangzhou, Jiangsu, P. R. China
| | - D Shao
- Poultry Institute, Chinese Academy of Agricultural Sciences, 225125 Yangzhou, Jiangsu, P. R. China
| | - J M Zou
- Poultry Institute, Chinese Academy of Agricultural Sciences, 225125 Yangzhou, Jiangsu, P. R. China
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Song Z, Shao D, Sun X, Niu J, Gong D. Molecular characterization, tissue expression, and polymorphism analysis of liver-type fatty acid binding protein in Landes geese. Genet Mol Res 2015; 14:389-99. [DOI: 10.4238/2015.january.23.12] [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: 11/03/2022]
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Abstract
Pre-eclampsia is a serious multisystem disorder and causes significant increase in both maternal and foetal morbidity and perinatal mortality globally. Due to the limited understanding of the molecular mechanism of pre-eclampsia, the current study conducted bioinformatic analyses to screen key regulators involved in pre-eclampsia. The gene expression profiling dataset GSE44711 containing 8 early-onset pre-eclampsia placentas and 8 gestational-age-matched control placentas was downloaded from the Gene Expression Omnibus database. Differentially expressed genes (DEGs) were screened by limma software package, which were then subjected to Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway analysis on the Database for Annotation, Visualization, and Integrated Discovery website. Finally, protein-protein interaction network was constructed using the Search Tool for the Retrieval of Interacting Genes database. In total, 192 DEGs including 106 upregulated and 86 downregulated genes were obtained. Proteoglycan 2 and podoplanin were the most significantly up- and downregulated genes, respectively. In addition, three potential pathways and their related DEGs: spermidine/spermine N1-acetyltransferase 1, amiloride-binding protein 1 and adenosylmethionine decarboxylase 1 were associated with arginine and proline metabolism. Vascular endothelial growth factor C; phosphatidylinositol-4, 5-bisphosphate 3-kinase, catalytic subunit beta; collagen, type I, alpha 1 (COL1A1); and fibronectin 1 (FN1) were associated with focal adhesion. COL6A1 as well as COL1A1 and FN1 were involved in extra-cellular matrix-receptor interaction. The current study identified several potential genes and three pathways which may be considered as candidate targets for diagnosis and therapy of pre-eclampsia.
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Affiliation(s)
- P He
- a Department of Physiological Obstetric , Guangzhou Women and Children's Medical Centre, Guangzhou Medical University , Guangzhou , P. R. China
| | - D Shao
- b Guangzhou Medical Research and Development Centre of BGI , Guangzhou , P. R. China
| | - M Ye
- b Guangzhou Medical Research and Development Centre of BGI , Guangzhou , P. R. China
| | - G Zhang
- a Department of Physiological Obstetric , Guangzhou Women and Children's Medical Centre, Guangzhou Medical University , Guangzhou , P. R. China
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Chowdhury J, Ramakrishnan L, Svermova T, Mumby S, Shao D, Wort S, Burke-Gaffney A. P18 Robo1/4-slit2 Expression In Pulmonary Vascular Cells: Implications For Pah? Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.168] [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: 11/03/2022]
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Shao D, Wort S. S39 The Role Of Soluble Guanylate Cyclase Stimulator Bay 41-2272 On Remodelling Processes Relevant To The Pathogenesis Of Pulmonary Arterial Hypertension. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.45] [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: 11/03/2022]
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Shao D, Gambaryan N, Meng C, Perros F, Humbert M, Adcock I, Wort S. S142 The role of H3K27 methylation in vascular endothelial cell proliferation and function: implications for pulmonary arterial hypertension. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.149] [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: 11/03/2022]
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Price LC, Paul-Clark M, Meng C, Shao D, Mitchell JA, Adcock IM, Wort SJ. P159 Peripheral Blood Mononuclear Cells from patients with Idiopathic Pulmonary Arterial Hypertension are Hyporesponsive to Inflammatory stimuli. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.310] [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: 11/04/2022]
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Filipovic A, Green A, Shao D, Yague E, Pannuti A, Yao K, Feng G, Lin S, Miele L, Coombes C. Abstract P5-06-04: Nicastrin Reveals Gamma-Secretase Independent Function in Breast Cancer Cells and Can Be Targeted by a Blocking Monoclonal Antibody To Reduce Breast Cancer Cell Proliferation and Invasion. Cancer Res 2010. [DOI: 10.1158/0008-5472.sabcs10-p5-06-04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
BACKGROUND: Nicastrin (NCT) is a structural and functional part of the gamma-secretase (GS) enzyme, implicated in tumorigenesis and resistance to treatment in multiple cancer types. However, its mechanism(s) of action and biological functions are poorly understood. We investigated functional and biological effects of inhibiting NCT in breast cancer (BC)cells by means of gene silencing and blocking antibodies, as well as the prognostic value of NCT expression in BC tissue. METHODS: NCT siRNA (Dahrmacon) was used at 40nM. A polyclonal antibody (pcAb) against NCT extracellular domain was developed at Biogenes (GE), and anti-NCT monoclonal antibodies (mAbs) at Genovac (GE). We tested the Abs for their ability to recognize endogenous NCT in BC cells by FACS and Western blot. Best Abs were tested in vitro, using a transwell cell invasion assay and proliferation assay. Anti-NCT Ab (Sigma, N1660) was used for immunohistochemistry (IHC) staining of BC tissues (n = 1050). Cases were scored as NCT negative (0), 1+, 2+ or 3+. Kaplan Meier analysis was used to investigate impact of NCT expression on survival. Illumina (Agilent) oligonucleotide arrays were used to investigate NCT siRNA effects on gene expression in BC cells. Both PcAb and mAbs recognized endogenous NCT in BC cells. In vitro, blocking NCT in MDA-MB231 BC cells with the PcAb, reduced cell proliferation in a dose dependent manner; by 50% and 70% at concentrations of 50μg/ml and 100μg/ml, respectively. mAbs reduced proliferation by 50% (clones 2H6 and 10C5) and 70% clone 10C11, (P<0.01). In transwell cell invasion assay, anti-NCT pcAb induced a dose dependent reduction of invasion, by 35% at the 5μg/ml, peaking at > 60% reduction at 50μg/ml (P<0.001). mAbs reduced cell invasion by 40-50% (clone 10C5 and 10C11) and by >65% (clone 2H6) (P<001). IHC data showed that NCT was highly expressed (2+, 3+) in 47.5% of BC tissues. High NCT expression correlated with worse overall survival (OS) in ERnegative patients (p=0.05). To elucidate the effects of NCT loss, compared to those induced by GSIs or silencing Notch receptors, we examined cDNA from MDA231 treated independently with NCT, Notch1, Notch2, Notch4 siRNAs and GSI MK-003, on Illumina expression arrays. Thirteen of the 18 genes maximally affected by GSI were similarly affected by NCT siRNA. NCT knockdown also affected 1745 other genes that by large were not affected by GSI or Notch knockdowns. This suggests that NCT has GS-and Notch-independent cellular functions and may have different biological properties as a therapeutic target than GS. Among NCT siRNA affected genes, some are tumor suppressors: CST4 increased 8 fold; pro-invasive genes like GNG11 decreased 4 fold; cell adhesion genes: CTGF increased 4.5 fold etc.
CONCLUSIONS: NCT is overexpressed in 47.5% of BC cases where it infers adverse OS in the ER-vecohort of patients. Anti-NCT mAbs recognize endogenous NCT in BC cells and reduce BC cell proliferation and invasion. Silencing NCT in invasive BC cells induces extensive gene expression changes that only partially overlap with those caused by GSIs or Notch siRNAs. We conclude that NCT has GS-independent functions in BC cells and that an anti-NCT mAb may be a promising therapeutic approach for invasive BC.
Citation Information: Cancer Res 2010;70(24 Suppl):Abstract nr P5-06-04.
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Affiliation(s)
- A Filipovic
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - A Green
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - D Shao
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - E Yague
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - A Pannuti
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - K Yao
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - G Feng
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - S Lin
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - L Miele
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
| | - C. Coombes
- Imperial College London, London, United Kingdom; Univeristy of Nottingham, United Kingdom; University of Mississippi Medical Center, Jackson; University of Mississippi Cancer Institute; Northshore University of Chicago; Northwestern University
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Price L, Caramori G, Dorfmuller P, Perros F, Zhu J, Shao D, Humbert M, Adcock I, Wort S. P29 Endothelial cell NF-kB activation is increased in human idiopathic PAH. Thorax 2010. [DOI: 10.1136/thx.2010.150961.29] [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: 11/04/2022]
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Shao D, Perros F, Humbert M, Caramori G, Price L, Addcock I, Wort S. S154 Is there a role for IL-33 in the pathogenesis of pulmonary arterial hypertension? Thorax 2010. [DOI: 10.1136/thx.2010.150953.5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Price LC, Wort SJ, Montani D, Tcherakian C, Dorfmuller P, Souza R, Shao D, Simonneau G, Howard LS, Adcock I, Humbert M, Perros F. S152 Dexamethasone reverses established monocrotaline-induced pulmonary hypertension in rats and increases pulmonary BMPR2 expression. Thorax 2010. [DOI: 10.1136/thx.2010.150953.3] [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: 11/04/2022]
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Tsang SW, Shao D, Cheah KSE, Okuse K, Leung PS, Yao KM. Increased basal insulin secretion in Pdzd2-deficient mice. Mol Cell Endocrinol 2010; 315:263-70. [PMID: 19932150 DOI: 10.1016/j.mce.2009.11.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [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] [Received: 07/16/2009] [Revised: 11/12/2009] [Accepted: 11/12/2009] [Indexed: 10/20/2022]
Abstract
Expression of the multi-PDZ protein Pdzd2 (PDZ domain-containing protein 2) is enriched in pancreatic islet beta cells, but not in exocrine or alpha cells, suggesting a role for Pdzd2 in the regulation of pancreatic beta-cell function. To explore the in vivo function of Pdzd2, Pdzd2-deficient mice were generated. Homozygous Pdzd2 mutant mice were viable and their gross morphology appeared normal. Interestingly, Pdzd2-deficient mice showed enhanced glucose tolerance in intraperitoneal glucose tolerance tests and their plasma insulin levels indicated increased basal insulin secretion after fasting. Moreover, insulin release from mutant pancreatic islets was found to be twofold higher than from normal islets. To verify the functional defect in vitro, Pdzd2 was depleted in INS-1E cells using two siRNA duplexes. Pdzd2-depleted INS-1E cells also displayed increased insulin secretion at low concentrations of glucose. Our results provide the first evidence that Pdzd2 is required for normal regulation of basal insulin secretion.
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Affiliation(s)
- S W Tsang
- Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
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Filipovic A, Rashied S, Balasubramanian R, Shao D, Yague E, Coombes R. Inhibiting nicastrin (NCT) stabilizes expression of e-cadherin and has potential in inducing mesenchymal to epithelial transition in breast cancer (BC). Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-3066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Abstract #3066
Introduction: NCT is a member of the Gamma Secretase (GS) enzyme complex, responsible for activating multiple substrates (Notch proteins, Her4, E-cadherin , CD44 etc.), implicated in BC development and progression from primary tumour to metastasis. E-cadherin (E-cad) is a key protein regulating cell-to-cell adhesion. Loss of E-cad is a central feature of Epithelial-to-Mesenchymal (EMT) transition enabling cell migration and invasion, while restoration of E-cad expression indicates a less malignant cell phenotype.
 Materials and Methods: MCF-7 and MDA-MB-231 BC cell lines were used to investigate expression of NCT by Western Blot (WB) and RT-Q-PCR. Paraffin embedded BC tissue samples (n=126), 10 benign breast lesions (fibroadenoma) and 40 normal breast tissue specimens were analysed for NCT expression by Immunohistrochemistry (IHC). NCT was transiently silenced in vitro by siRNA and expression of E-cad, Beta-Catenin, Snail1 were analysed by WB and RT-Q-PCR. A commercially available kit was used to measure GS activity in vitro. Transmitted light microscopy was used to monitor cell motility using a model of a stable NCT knockout (KO) in mouse embryonic fibroblast (MEF) cells.
 Results: NCT was not expressed or was weakly expressed in normal breast tissue by IHC. Strikingly, NCT was highly expressed only in the myoepithelial layer of all 10 fibroadenomas analysed, while epithelial layer remained negative of weakly NCT positive (+). Breast carcinomas were graded as NCT 1+, 2+ or 3+. NCT siRNA (72 h) resulted in >90% reduction of both NCT mRNA and protein levels, as well as >50% reduction in GS activity in both MDA-MB-231 and MCF-7 cell lines. NCT siRNA did not affect E-cad, Beta-Catenin or Snail1 mRNA levels in these cell lines. However, NCT siRNA resulted in cellular redistribution of E-cad to the cell membrane, as visualized by immunofluorescence, and an increase in E-cad protein levels by WB in MCF-7 cells. The transient NCT silencing at 72 h did not result in change of morphology in MDA-MB-231 cells. Cell motility was, however, reduced by 20%: (0.01 µm/sec in parental MDA-MB-231 vs 0.008 µm/sec in MDA-MB-231 NCT siRNA cells). Stable NCT KO caused a notable change in cell phenotype, converting a spindle like wild type MEFs to rounded epitheloid-like morphology, coupled with a marked increase of E-cad localized to the membrane. Furthermore, cell motility was reduced by 3 fold in NCT KO MEFs (0.008 µm/sec in wild type MEFs vs 0.0025um/sec in the NCT KO MEFs).
 Conclusion: NCT is up-regulated in BC as compared to normal breast tissue. NCT is strongly expressed only in the myoepithelial cell compartment of breast fibroadenomas, suggesting possible involvement of NCT in EMT. Inhibiting NCT stabilizes E-cadherin protein levels in BC cells, at the post-translational level. Inhibiting NCT in BC may represent a potential strategy to reduce BC invasiveness and metastasis.
Citation Information: Cancer Res 2009;69(2 Suppl):Abstract nr 3066.
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Affiliation(s)
- A Filipovic
- 1 Oncology, Imperial College London, London, United Kingdom
| | - S Rashied
- 1 Oncology, Imperial College London, London, United Kingdom
| | | | - D Shao
- 1 Oncology, Imperial College London, London, United Kingdom
| | - E Yague
- 1 Oncology, Imperial College London, London, United Kingdom
| | - R Coombes
- 1 Oncology, Imperial College London, London, United Kingdom
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Yu M, Shao D, Feng X, Duan M, Xu J. Effects of ketamine on pulmonary TLR4 expression and NF-kappa B activation during endotoxemia in rats. ACTA ACUST UNITED AC 2007; 29:395-9. [DOI: 10.1358/mf.2007.29.6.1119165] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Shao D, Forge A, Munro PMG, Bailly M. Arp2/3 complex-mediated actin polymerisation occurs on specific pre-existing networks in cells and requires spatial restriction to sustain functional lamellipod extension. ACTA ACUST UNITED AC 2006; 63:395-414. [PMID: 16619224 PMCID: PMC7611918 DOI: 10.1002/cm.20131] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The classical Arp2/3-mediated dendritic network defines the cytoskeleton at the leading edge of crawling cells, and it is generally assumed that Arp2/3-mediated actin polymerization generates the force necessary to extend lamellipods. Our previous work suggested that successful lamellipod extension required not only free barbed ends for actin polymerization but also a proper ultrastructural organization of the cytoskeleton. To further explore the structural role of the Arp2/3 complex-mediated networks in lamellipod morphology and function, we performed a detailed analysis of the ultrastructure of the Arp2/3-mediated networks, using the WA domains of Scar and WASp to generate mislocalised Arp2/3 networks in vivo, and to reconstruct de novo Arp2/3-mediated actin nucleation and polymerization on extracted cytoskeletons. We present here evidence that spatially unrestricted Arp2/3-mediated networks are intrinsically three-dimensional and multilayered by nature and, as such, cannot sustain significant polarized extension. Furthermore, such networks polymerize only at preferred locations in extracted cells, corresponding to pre-existing Arp2/3 networks, suggesting that the specific molecular organization of the actin cytoskeleton, in terms of structure and/or biochemical composition, dictates the location of Arp2/3 complex-mediated actin polymerization. We propose that successful lamellipod extension depends not only on localized actin polymerization mediated through local signalling, but also on spatial restriction of the Arp2/3 complex-mediated nucleation of actin polymerization, both in terms of location within the cell and ultrastructural organization of the resulting network.
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Affiliation(s)
- D Shao
- Division of Cell Biology, UCL Institute of Ophthalmology, London, United Kingdom
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Zhang ML, Zhang ML, Zhang ML, Ren A, Ren A, Ren A, Shao D, Shao D, Shao D, Wang X, Wang X, Wang X. Effect of fulvic acid and ionic strength on the sorption of radiostrontium on Chinese calcareous soil and its solid components. J Radioanal Nucl Chem 2006. [DOI: 10.1007/s10967-006-0119-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Muhogora WE, Nyanda AM, Ngoye WM, Shao D. Radiation doses to patients during selected CT procedures at four hospitals in Tanzania. Eur J Radiol 2005; 57:461-7. [PMID: 16165335 DOI: 10.1016/j.ejrad.2005.08.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2005] [Revised: 07/27/2005] [Accepted: 08/10/2005] [Indexed: 12/21/2022]
Abstract
The dose characteristics of CT scanners from local scanning protocols were investigated on the basis of questionnaire information provided by four hospitals conducting CT procedures in Tanzania. The information included scanner model, scanner manufacturer, number of most frequent CT examinations and the employed scanning parameters to previously diagnosed patients. For each scan technique, patient doses were estimated in terms of computerized tomography dose index, dose length product and effective dose using the software developed by the ImPACT scan group in conjunction with the NRPB conversion coefficients data. The results show that the mean CTDI_w,100, DLP and effective dose ranged from 8.5 +/- 2.8 to 79.3 +/- 23.7mGy, 145 +/- 5 to 1400 +/- 812.5 mGy cm and 3 +/- 2.3 to 15.7 +/- 10.4 mSv, respectively. On average, the observed CT doses are however roughly higher than the reported literature data such as 30 to 60 mGy, 570 to 1050 mGy cm and 2.4 to 11.7 mSv recommended by European Commission for similar CT examinations. The higher dose levels, which are possibly associated with significant risks, justify extensive similar studies at the national level in order to unify different approaches towards optimisation of CT examinations. In pursue of this noble objective, the need to train the radiology personnel, establish and using protocols and continuously monitor the performance of CT equipment to control patient CT doses is of utmost importance.
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Affiliation(s)
- W E Muhogora
- Tanzania Atomic Energy Commission, P.O. Box 743, Arusha, United Republic of Tanzania.
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Alvarez de la Rosa D, Coric T, Todorovic N, Shao D, Wang T, Canessa CM. Distribution and regulation of expression of serum- and glucocorticoid-induced kinase-1 in the rat kidney. J Physiol 2003; 551:455-66. [PMID: 12816971 PMCID: PMC2343216 DOI: 10.1113/jphysiol.2003.042903] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [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] [Revised: 03/12/2003] [Accepted: 06/12/2003] [Indexed: 01/03/2023] Open
Abstract
The serum- and glucocorticoid-induced kinase-1 (sgk1) increases the activity of a number of epithelial ion channels and transporters. The present study examines the distribution and subcellular localization of sgk1 protein in the rat kidney and the regulation of levels of expression induced by steroids. The results indicate that the kidney expresses predominantly the sgk1 isoform with a distribution restricted to the thick ascending limb of Henle, distal convoluted, connecting and cortical collecting tubules. Within cells, sgk1 strongly associates with the microsomal fraction of homogenates and it colocalizes with the Na+,K+-ATPase to the basolateral membrane. Analysis of the levels of expression of sgk1 by Western blotting and immunohistochemistry indicates constitutive high expression under basal conditions. Approximately half of the basal level is maintained by glucocorticoids whereas physiological fluctuations of aldosterone produce minor changes in sgk1 abundance in adrenal-intact animals. These results do not support the notion that physiological changes of aldosterone concentration turn the expression of sgk1 'on and off' in the mammalian kidney. Additionally, localization of sgk1 to the basolateral membrane indicates that the effects mediated by sgk1 do not require a direct interaction with the ion channels and transporters whose activity is modulated, since most of these proteins are located in the apical membrane of renal epithelial cells.
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MESH Headings
- Adrenalectomy
- Aldosterone/pharmacology
- Animals
- Antibodies/chemistry
- Antibody Specificity
- Blotting, Northern
- Blotting, Western
- Cells, Cultured
- DNA, Complementary/biosynthesis
- DNA, Complementary/genetics
- Electrophoresis, Polyacrylamide Gel
- Epithelial Cells/enzymology
- Gene Expression Regulation, Enzymologic/drug effects
- Gene Expression Regulation, Enzymologic/physiology
- Glucocorticoids/pharmacology
- Immediate-Early Proteins
- Immunoblotting
- In Vitro Techniques
- Isoenzymes/genetics
- Isoenzymes/immunology
- Isoenzymes/metabolism
- Kidney/enzymology
- Kidney Tubules/enzymology
- Microscopy, Fluorescence
- Nuclear Proteins
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/immunology
- Protein Serine-Threonine Kinases/metabolism
- RNA/isolation & purification
- RNA/metabolism
- Rats
- Rats, Sprague-Dawley
- Subcellular Fractions/enzymology
- Transfection
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Affiliation(s)
- D Alvarez de la Rosa
- Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06520-8026, USA
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Zhao S, Dai H, Shao D. [Predictive value of combined application of umbilical artery color Doppler velocimetry, nonstress testing and ultrasonography in monitoring umbilical cord entanglement]. Zhonghua Yi Xue Za Zhi 2001; 81:468-71. [PMID: 11798920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To explore the predictive value of combined application of umbilical artery color Doppler flow monitoring (CDFI), nonstress testing (NST) and ultrasonography in monitoring umbilical cord entanglement. METHODS 1 860 cases of pregnant women between gestational ages of 37 approximately 42 weeks were studied 1 approximately 2 weeks before delivery by CDFI, nonstress testing (NST) and ultrasonography to monitor umbilical cord entanglement. RESULTS The prevalence rate of umbilical cord entanglement was 23.23% (432/1 860). Positive predictive value and negative predictive value were 95.4 % (412/432) and 98.6% (1 408/1 428) respectively. The rate of accuracy was 97.8% (1 820/1 860). The rate of fetal distress among the fetuses with umbilical cord round the body or four limbs was 85.29% (23/34) and the incidence of cesarean section in this group was 88.28% (30/34). The rate of fetal distress among the fetuses with umbilical cord round the neck was 13.06% (52/398) and the incidence of cesarean section in this group was 44.94% (178/398). The rates of fetal distress and cesarean section were significantly higher in the group with umbilical cord around the body or four limbs than in the group with umbilical cord around the neck (chi(2) = 107.27 and 23.76 respectively, P < 0.001). The systolic/diastolic (S/D) ratio was basically in normal ranges in the group with the umbilical cord round the neck. In cardiotopography (CTG), umbilical cord entanglement mainly showed variable deceleration (VD), early deceleration (ED), nonreaction on NST, and late deceleration (LD) on oxytocin challenge test (OCT). Prolonged fetal heart rate deceleration (PD) could be seen in the group with umbilical cord around the body or four limbs. CONCLUSION The combined application of umbilical artery color Doppler velocimetry, nonstress testing and ultrasonography have an important auxiliary value in monitoring umbilical cord entanglement. It remarkably increases the positive predictive rate as a valuable reference for the choice of delivery form.
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Affiliation(s)
- S Zhao
- Department of Gynecology and Obstetrics, Affiliated Hospital of Medical College of Qingdao University, Qingdao 266003, China
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44
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Ono S, Shao D, Yamada S, Yang Y, Yamashita M, Hamaoka T. A novel function of B lymphocytes from normal mice to suppress autoimmunity in (NZB x NZW)F1 mice. Immunology 2000; 100:99-109. [PMID: 10809965 PMCID: PMC2326994 DOI: 10.1046/j.1365-2567.2000.00005.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In systemic autoimmune-prone (NZB x NZW)F1 (NZB/W F1) mice, B-cell abnormalities characterized by hypergammaglobulinaemia accompanying autoantibodies have been thought to be a main cause of the disease. To examine a possible regulatory role of B cells in the disease manifestations, we injected, intravenously (i.v.), normal or autoimmune B cells into non-irradiated NZB/W F1 mice. The injection of splenic B cells from major histocompatibility (MHC)-matched or allogeneic normal mice caused a marked decrease in serum immunoglobulin G (IgG) levels of autoantibodies, delayed the appearance of proteinuria and prolonged life span, whereas treatment with splenic B cells from NZB/W F1 or X-linked immunodeficient (Xid) mice failed to suppress the autoimmunity. Moreover, in vitro polyclonal antibody responses to lipopolysaccharide (LPS) of NZB/W F1-derived B cells from the treated mice were markedly reduced. Interestingly, the treatment of NZB/W F1 mice at 16, 18 and 20 or at 20, 22 and 24 weeks of age was more effective than that at 6, 8 and 10 weeks. The treatment also inhibited the development of surface IgG+ (sIgG+) B cells and splenomegaly, prominent in aged NZB/W F1 mice. In addition, when untreated NZB/W F1 responding B cells were precultured with normal B cells in vitro for 3 days, they also diminished the autoantibody production to subsequent LPS stimulation. Hence, the present results imply a novel function of normal B cells to ameliorate autoimmune disease in NZB/W F1 mice by correcting their B-cell abnormalities, and indicate that NZB/W F1 and Xid mice possess defects in this regulatory B-cell function.
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Affiliation(s)
- S Ono
- Division of Oncogenesis, Biomedical Research Center, Osaka University Graduate School of Medicine, Osaka, Japan
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Affiliation(s)
- D Shao
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104-6149, USA
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Emala CW, Togashi H, Shao D, Hirshman CA. Muscarinic receptor-mediated reorganization of the actin ctyoskeleton is coupled through the Giα 2 protein in human airway smooth muscle cells. Life Sci 1999. [DOI: 10.1016/s0024-3205(99)90503-9] [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]
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Abstract
Binding to receptors in the cell nucleus is crucial for the action of lipophilic hormones and ligands. PPAR-gamma (for peroxisome proliferator-activated receptor) is a nuclear hormone receptor that mediates adipocyte differentiation and modulates insulin sensitivity, cell proliferation and inflammatory processes. PPAR-gamma ligands have been implicated in the development of atherogenic foam cells and as potential cancer treatments. Transcriptional activity of PPAR-gamma is induced by binding diverse ligands, including natural fatty acid derivatives, antidiabetic thiazolidinediones, and non-steroidal anti-inflammatory drugs. Ligand binding by PPAR-gamma, as well as by the entire nuclear-receptor superfamily, is an independent property of the carboxy-terminal ligand-binding domain (LBD) of the receptor. Here we show that ligand binding by PPAR-gamma is regulated by intramolecular communication between its amino-terminal A/B domain and its carboxy-terminal LBD. Modification of the A/B domain, for example by physiological phosphorylation by MAP kinase, reduces ligand-binding affinity, thus negatively regulating the transcriptional and biological functions of PPAR-gamma. The ability of the A/B domain to regulate ligand binding has important implications for the evaluation and mechanism of action of potentially therapeutic ligands that bind PPAR-gamma and that are likely to extend to other members of the nuclear-receptor superfamily.
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Affiliation(s)
- D Shao
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104, USA
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Hirshman CA, Togashi H, Shao D, Emala CW. Galphai-2 is required for carbachol-induced stress fiber formation in human airway smooth muscle cells. Am J Physiol 1998; 275:L911-6. [PMID: 9815108 DOI: 10.1152/ajplung.1998.275.5.l911] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To determine which heterotrimeric G protein couples muscarinic receptors to stress fiber formation [measured by an increase in the filamentous (F)- to monomeric (G)-actin ratio] in human airway smooth muscle (ASM) cells, cultured human ASM cells expressing the M2 muscarinic receptor were grown to confluence. Cells were exposed for 6 days to 10 microM antisense oligonucleotides designed to specifically bind to the mRNA encoding Galphai-2, Galphai-3, or Gqalpha. A randomly scrambled oligonucleotide served as a control. F- to G-actin ratios were measured with dual-fluorescence labeling after 5 min of carbachol exposure, which is known to increase the F- to G-actin ratio. Cells in parallel wells were harvested for immunoblot analysis of G protein alpha-subunit expression. Oligonucleotide antisense treatment decreased protein expression of the respective G protein alpha-subunit. Antisense depletion of the Galphai-2 protein but not of Galphai-3 or Gqalpha protein blocked the carbachol-induced increase in the F- to G-actin ratio. These results show that the Galphai-2 protein couples muscarinic receptors to stress fiber formation in ASM.
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Affiliation(s)
- C A Hirshman
- Department of Anesthesiology, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21205, USA
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Yin S, Jiang S, Shao D. [Impulsive angular acceleration evoked middle and long latency potentials in guinea pigs]. Zhonghua Er Bi Yan Hou Ke Za Zhi 1998; 31:214-8. [PMID: 9642345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Middle and long latency evoked potentials have been successfully recorded in guinea pigs with impulsive angular acceleration delivered by a specially developed motor. The middle latency responses elicited by impulsive angular acceleration had peaks at about 9 ms, 15 ms and 24 ms with a mean peak to peak amplitude of about 28muV and the long latency responses after the delivering of impulsive angular acceleration in guinea pigs composed of a triphasic wave with a mean peak to peak amplitude of about 50 muV occurring during 32 ms to 130 ms with respect to the start of head stimuli. A series of experiments lead to the conclusion that the middle latency responses to impulsive angular acceleration are middle latency vestibular evoked potentials. The long latency response elicited by impulsive angular acceleration is not a specific response of auditory or vestibular pathway.
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Affiliation(s)
- S Yin
- Affiliated Hospital of Jinzhou Medical College
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Shao D, Creasy CL, Bergman LW. A cysteine residue in helixII of the bHLH domain is essential for homodimerization of the yeast transcription factor Pho4p. Nucleic Acids Res 1998; 26:710-4. [PMID: 9443961 PMCID: PMC147311 DOI: 10.1093/nar/26.3.710] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The yeast transcription factor Pho4p is required for expression of the phosphate-repressible acid phosphatase encoded by the PHO5 gene. Functional studies have shown that the molecule is composed of an N-terminal acidic activation domain, a central region which is necessary for interaction with a negative regulatory factor (the cyclin Pho80) and a C-terminal basic helix-loop-helix domain, which mediates DNA binding and homodimerization. In this study the homodimerization domain maps specifically to helixII of this region and a cysteine residue within this region is essential for this function. Experiments support the role of an intermolecular disulfide bond in stabilization of homodimerization, which is critical for DNA binding.
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Affiliation(s)
- D Shao
- Department of Microbiology and Immunology, Allegheny University of the Health Sciences, 2900 Queen Lane, Philadelphia, PA 19102, USA
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