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Xu X, Li Y, Chien CL. Observation of Odd-Parity Superconductivity with the Geshkenbein-Larkin-Barone Composite Rings. Phys Rev Lett 2024; 132:056001. [PMID: 38364125 DOI: 10.1103/physrevlett.132.056001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 11/25/2023] [Accepted: 12/19/2023] [Indexed: 02/18/2024]
Abstract
Phase-sensitive measurements on a composite ring made of a superconductor of interest connected by a known singlet s-wave superconductor can unambiguously determine its pairing symmetry. In composite rings with epitaxial β-Bi_{2}Pd and s-wave Nb, we have observed half-integer-quantum flux when Nb is connected to the opposite crystalline ends of β-Bi_{2}Pd and integer-quantum flux when Nb is connected to the same crystalline ends of β-Bi_{2}Pd. With ascending temperature, the half-integer-flux quantization transits to integer-flux quantization, before the eventual loss of phase coherence. These findings point to odd-parity pairing symmetry in superconducting β-Bi_{2}Pd.
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Affiliation(s)
- Xiaoying Xu
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Yufan Li
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - C L Chien
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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2
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Chiang CC, Lee HC, Lin SC, Qu D, Chu MW, Chen CD, Chien CL, Huang SY. Unequivocal Identification of Spin-Triplet and Spin-Singlet Superconductors with Upper Critical Field and Flux Quantization. Phys Rev Lett 2023; 131:236003. [PMID: 38134800 DOI: 10.1103/physrevlett.131.236003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/13/2023] [Indexed: 12/24/2023]
Abstract
Spin-triplet superconductors play central roles in Majorana physics and quantum computing but are difficult to identify. We show the methods of kink-point upper critical field and flux quantization in superconducting rings can unequivocally identify spin-singlet, spin-triplet in centrosymmetric superconductors, and singlet-triplet admixture in noncentrosymmetric superconductors, as realized in γ-BiPd, β-Bi_{2}Pd, and α-BiPd, respectively. Our findings are essential for identifying triplet superconductors and exploring their quantum properties.
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Affiliation(s)
- C C Chiang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Willian H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - H C Lee
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - S C Lin
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - D Qu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - M W Chu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - C D Chen
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - C L Chien
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Willian H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - S Y Huang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan
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Sun WZ, Lin HW, Chen WY, Chien CL, Lai YL, Chen J, Chen YL, Cheng WF. Dual inhibition of BTLA and PD-1 can enhance therapeutic efficacy of paclitaxel on intraperitoneally disseminated tumors. J Immunother Cancer 2023; 11:e006694. [PMID: 37463789 PMCID: PMC10357656 DOI: 10.1136/jitc-2023-006694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/25/2023] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND Expression of immune checkpoints in the tumor microenvironment is one mechanism underlying paclitaxel (PTX) chemoresistance. This study aimed to investigate whether the addition of checkpoint blockade to PTX can improve the therapeutic efficacy against apparently disseminated intraperitoneal tumors. METHODS We analyzed the in vivo expression of various immune checkpoints in CD3+CD8+ cytotoxic T cells from tumor-bearing mice treated with or without PTX and validated the tumor-killing activities of selected checkpoint-expressing T-cell subpopulations ex vivo. The regulation of selected checkpoints was investigated in vitro. The therapeutic effects of inhibition of a targeted checkpoint pathway with antibodies added to PTX therapy were examined. RESULTS CD3+CD8+ T cells expressed with herpes virus entry mediator (HVEM), programmed cell death 1 (PD-1), and T-cell immunoglobulin domain and mucin domain 3 (TIM-3) in tumor-bearing hosts treated with PTX had effective tumoricidal activities. In addition to PTX and cytokines, B and T lymphocyte attenuator (BTLA) or homologous to lymphotoxin, exhibits inducible expression and competes with herpes simplex virus (HSV) glycoprotein D for binding to HVEM, a receptor expressed on T lymphocytes (LIGHT) interacting with HVEM can regulate the expression of PD-1 on CD3+CD8+ T cells. Interleukin (IL)-15 increased the percentage of HVEMhighgranzyme B (GZMB)+ cells among CD3+CD8+ T cells, which was suppressed by the BTLA/HVEM signal. LIGHT induced the percentage of HVEM+GZMB+ cells but not HVEMhighGZMB+ cells among CD3+CD8+ T cells. Expression of IL-15, BTLA, or LIGHT was detected in CD19+ B cells and regulated by damage-associated molecular patterns/Toll-like receptor interactions. In the tumor-bearing hosts treated with PTX, certain proportions of BTLA+ B or PD-1+ T lymphocytes were still noted. When dual inhibition of BTLA and PD-1 was added to PTX, the antitumor effects on intraperitoneally disseminated tumors can be significantly improved. CONCLUSIONS Dual blockade of BTLA on B cells and PD-1 on cytotoxic T cells may have clinical potential for enhancing the efficacy of PTX in the treatment of tumors with intraperitoneal spread, including epithelial ovarian carcinomas.
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Affiliation(s)
- Wei-Zen Sun
- Department of Anesthesiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Han-Wei Lin
- Department of Anesthesiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wan-Yu Chen
- Graduate Institute of Oncology,College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chung-Liang Chien
- Graduate Institute of Anatomy and Cell Biology,College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yen-Ling Lai
- Department of Obstetrics and Gynecology,College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Obstetrics and Gynecology, National Taiwan University Hospital Hsin-Chu Branch, Hsin‑Chu, Taiwan
| | - Jung Chen
- Department of Obstetrics and Gynecology,College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yu-Li Chen
- Department of Obstetrics and Gynecology,College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Obstetrics and Gynecology, National Taiwan University Hospital Yun-Lin Branch, Yun‑Lin county, Taiwan
| | - Wen-Fang Cheng
- Graduate Institute of Oncology,College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Obstetrics and Gynecology,College of Medicine, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
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Utomo R, McWatt SC, Talis A, Xiao QY, Saraci K, Waschke J, Sigmund AM, Gill Sagoo M, Wingate R, Brassett C, Chien CL, Traxler H, Sakurai T, Zeroual M, Olsen J, El-Batti S, Viranta-Kovanen S, Yamada Y, Keay KA, Kitahara S, Stewart W, Mao Y, Lang A, Kunzel C, Bernd P, Patel S, Buehler L, Kielstein H, Preker A, Hardy MA, Noël GPJC, Wu A. Health profession students' outlooks on the medical profession during the COVID-19 pandemic: a global perspective. J Commun Healthc 2023:1-15. [PMID: 37213185 DOI: 10.1080/17538068.2023.2214391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
BACKGROUND This article summarizes a global study of the effect of the COVID-19 pandemic on junior health professions students' outlook on medicine. The pandemic has significantly affected health professions education. There is limited understanding of how students' pandemic experiences will affect them, and what impact these events may have on their career paths or the future of the professions. This information is important as it impacts the future of medicine. METHODS In the Fall 2020 semester, 219 health professions students at 14 medical universities worldwide responded to the question: 'Has this experience (with COVID-19) changed your outlook on medicine as a profession?'. Short essay responses were semantically coded and organized into themes and subthemes using an inductive approach to thematic analysis. RESULTS 145 responses were submitted. Themes were identified: (1) students reflected on the interaction between politics and healthcare; (2) reported becoming more aware of the societal expectations placed on healthcare professionals, including undertaking high risks and the sacrifices that healthcare professionals must make; (3) found reassurance from the recognized importance of healthcare professionals and expressed pride to be entering the profession; and (4) reflected on the current state of healthcare, including its limitations and future. CONCLUSION Most students, independent of the extent of the pandemic in their respective countries, noted a change in their outlook regarding medicine. An overall positive outlook was noted in most junior students. Educators need to work on nurturing these sentiments and attitudes to help young students maintain a healthy relationship towards their chosen profession.
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Affiliation(s)
- Rachel Utomo
- College of Dental Medicine, Columbia University, New York, NY, USA
| | - Sean C McWatt
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada
| | - Austin Talis
- College of Dental Medicine, Columbia University, New York, NY, USA
| | - Que Yun Xiao
- College of Dental Medicine, Columbia University, New York, NY, USA
| | - Kerstin Saraci
- Vegetative Anatomy, Faculty of Medicine, Institute of Anatomy, Ludwig Maximilians University, Munich, Germany
| | - Jens Waschke
- Vegetative Anatomy, Faculty of Medicine, Institute of Anatomy, Ludwig Maximilians University, Munich, Germany
| | - Anna Madgalena Sigmund
- Vegetative Anatomy, Faculty of Medicine, Institute of Anatomy, Ludwig Maximilians University, Munich, Germany
| | - Mandeep Gill Sagoo
- Department of Anatomy and Centre for Education, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Richard Wingate
- Department of Anatomy and Centre for Education, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Cecilia Brassett
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hannes Traxler
- Center for Anatomy and Cell Biology, Medical University of Vienna, Vienna, Austria
| | | | - Mina Zeroual
- Vegetative Anatomy, Faculty of Medicine, Institute of Anatomy, Ludwig Maximilians University, Munich, Germany
| | - Jorgen Olsen
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Salma El-Batti
- Department of Cardiovascular Surgery, University of Paris, Paris, France
| | | | - Yukari Yamada
- Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kevin A Keay
- Discipline of Anatomy and Histology, The University of Sydney, Sydney, Australia
| | - Shuji Kitahara
- Faculty of Advanced Techno-Surgery, Tokyo Women's Medical University, Tokyo, Japan
| | - William Stewart
- Anatomy Section, Department of Surgery, Yale University, New Haven, CT, USA
| | - Yinghui Mao
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Ariella Lang
- Columbia College, Columbia University, New York, NY, USA
| | - Carol Kunzel
- College of Dental Medicine, Columbia University, New York, NY, USA
| | - Paulette Bernd
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Snehal Patel
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Leo Buehler
- Department of Surgery, University of Fribourg, Fribourg, Switzerland
| | - Heike Kielstein
- Medical Faculty, Institute for Anatomy and Cell Biology, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Alexander Preker
- Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Mark A Hardy
- Department of Surgery, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Geoffroy P J C Noël
- Anatomy Division, Department of Surgery, University of California San Diego, La Jolla, CA, USA
| | - Anette Wu
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
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Wu A, McWatt SC, Utomo R, Talis A, Xiao QY, Saraci K, Brassett C, Sagoo MG, Wingate R, Chien CL, Traxler H, Waschke J, Vielmuth F, Sigmund A, Yamada Y, Sakurai T, Zeroual M, Olsen J, El-Batti S, Viranta-Kovanen S, Keay K, Stewart W, Mao Y, Lang A, Kunzel C, Bernd P, Kielstein H, Noël GPJC. A thematic analysis of students' discussions on death and body donation in international online focus groups. Anat Sci Educ 2023. [PMID: 36883007 DOI: 10.1002/ase.2265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Historically, Anatomy education is an in-person discipline involving exposure to human body donors that facilitates personal and professional growth through, in part, the initiation of reflection on the topic of death. However, during the COVID-19 pandemic the decreased exposure to cadaveric anatomy for many health professions students may have influenced the depth of their individual reflections on this topic. Accordingly, this study aimed to investigate the effect of an alternate approach-focus group discussions between peers with varying degrees of exposure to cadaveric material-that may offer one strategy to stimulate deep reflection on the topic of death. A programmatic intervention was introduced, wherein students (n = 221) from 13 international universities discussed differences in their anatomy courses during small focus group sessions as part of an online exchange program. An inductive semantic thematic analysis was conducted on responses to an open-ended text-response question on how the activity influenced students' reflections about death. Resulting themes were organized into categories that described the content and topics of the students' discussions as they grappled with this sensitive topic. The students reportedly engaged in deep reflection and expressed an increased sense of connectedness with their peers, despite their disparate exposure levels to cadaveric anatomy and being physically distanced. This demonstrates that focus groups with students experiencing different laboratory contexts can be used to help all students reflect on the topic of death and that interchanges between dissecting and non-dissecting students can initiate thoughts about death and body donation among non-dissecting students.
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Affiliation(s)
- Anette Wu
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons Columbia University, New York, New York, USA
| | - Sean C McWatt
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Rachel Utomo
- College of Dental Medicine, Columbia University, New York, New York, USA
| | - Austin Talis
- College of Dental Medicine, Columbia University, New York, New York, USA
| | - Que Yun Xiao
- College of Dental Medicine, Columbia University, New York, New York, USA
| | - Kerstin Saraci
- Institute of Anatomy, Vegetative Anatomy, Faculty of Medicine, Ludwig Maximilians University, Munich, Germany
| | - Cecilia Brassett
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - Mandeep Gill Sagoo
- Department of Anatomy and Neurobiology, School of Centre for Education, King's College London, London, UK
| | - Richard Wingate
- Department of Anatomy and Neurobiology, School of Centre for Education, King's College London, London, UK
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hannes Traxler
- Center for Anatomy and Cell Biology, Medical University Vienna, Vienna, Austria
| | - Jens Waschke
- Institute of Anatomy, Vegetative Anatomy, Faculty of Medicine, Ludwig Maximilians University, Munich, Germany
| | - Fransziska Vielmuth
- Institute of Anatomy, Vegetative Anatomy, Faculty of Medicine, Ludwig Maximilians University, Munich, Germany
| | - Anna Sigmund
- Institute of Anatomy, Vegetative Anatomy, Faculty of Medicine, Ludwig Maximilians University, Munich, Germany
| | - Yukari Yamada
- Kyoto University Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takeshi Sakurai
- Kyoto University Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Mina Zeroual
- Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Jorgen Olsen
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Salma El-Batti
- Department of Cardiovascular Surgery, University of Paris, Paris, France
| | | | - Kevin Keay
- Discipline of Anatomy and Histology, The University of Sydney, Sydney, New South Wales, Australia
| | - William Stewart
- Anatomy Section, Department of Surgery, Yale University, New Haven, Connecticut, USA
| | - Yinghui Mao
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons Columbia University, New York, New York, USA
| | - Ariella Lang
- Columbia College, Columbia University, New York, New York, USA
| | - Carol Kunzel
- College of Dental Medicine, Columbia University, New York, New York, USA
| | - Paulette Bernd
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons Columbia University, New York, New York, USA
| | - Heike Kielstein
- Institute of Anatomy and Cell Biology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
| | - Geoffroy P J C Noël
- Anatomy Division, Department of Surgery, University of California San Diego, San Diego, California, USA
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Wu A, Xiao QY, McWatt S, Utomo R, Talis A, Saraci K, Brassett C, Sagoo MG, Wingate R, Chien CL, Traxler H, Waschke J, Vielmuth F, Yamada Y, Sakurai T, Zeroual M, Olsen J, El-Batti S, Viranta-Kovanen S, Keay K, Stewart W, Kunzel C, Bernd P, Kielstein H, Noël GPJC. The Anatomy Course During COVID-19: The Impact of Cadaver-Based Learning on the Initiation of Reflection on Death. Med Sci Educ 2022; 32:1033-1044. [PMID: 36097588 PMCID: PMC9453724 DOI: 10.1007/s40670-022-01609-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/25/2022] [Indexed: 05/28/2023]
Abstract
BACKGROUND During the COVID-19 pandemic, in-person cadaveric dissection laboratories for teaching anatomy were omitted by many schools around the world. While knowledge domains can be easily evaluated via remote exams, non-traditional discipline-independent skills such as those encouraged through reflection on the topic of death are often overlooked. This study investigated how different anatomy course formats played a role in initiating students' reflections on death during the COVID-19 pandemic. METHOD In fall 2020, 217 medical, dental, premedical, and health sciences students from 13 international universities discussed differences in their anatomy courses online. Formats of anatomy courses ranged from dissection-based, prosection-based, hybrid (combination of dissection and prosection) to no laboratory exposure at all. Students' responses to the question, "Did/does your anatomy course initiate your thinking about life's passing?" were collected, and they self-reported themes that were present in their reflections on death using a multiple-choice prompt. Statistical analyses to detect differences between students with and without exposure to cadavers were performed using the chi-squared test. RESULTS When comparing students who had exposure to human anatomical specimens to those who had no exposure, the majority of students with exposure thought that the course did initiate thoughts about life's passing, compared to students without exposure (P < 0.05). Reflection themes were consistent across groups. DISCUSSION These findings indicate that anatomy dissection courses are important for the initiation of students' feelings about the topic of death. Omission of cadaveric dissection- or prosection-based laboratories will decrease the likelihood that students initiate reflection on this topic and gain important transferable skills.
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Affiliation(s)
- Anette Wu
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
| | - Que Yun Xiao
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
| | - Sean McWatt
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada
| | - Rachel Utomo
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
| | - Austin Talis
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
| | - Kerstin Saraci
- Institute of Anatomy, Faculty of Medicine, Vegetative Anatomy, Ludwig Maximilian University, Munich, Germany
| | - Cecilia Brassett
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - Mandeep Gill Sagoo
- Department of Anatomy and Neurobiology, School of Centre for Education, King’s College London, London, UK
| | - Richard Wingate
- Department of Anatomy and Neurobiology, School of Centre for Education, King’s College London, London, UK
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hannes Traxler
- Center for Anatomy and Cell Biology, Medical University Vienna, Vienna, Austria
| | - Jens Waschke
- Institute of Anatomy, Faculty of Medicine, Vegetative Anatomy, Ludwig Maximilian University, Munich, Germany
| | - Franziska Vielmuth
- Institute of Anatomy, Faculty of Medicine, Vegetative Anatomy, Ludwig Maximilian University, Munich, Germany
| | - Yukari Yamada
- Kyoto University Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takeshi Sakurai
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
- Kyoto University Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Mina Zeroual
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada
| | - Jorgen Olsen
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Salma El-Batti
- Department of Cardiovascular Surgery, University of Paris, Paris, France
| | | | - Kevin Keay
- Discipline of Anatomy and Histology, The University of Sydney, Sydney, Australia
| | - William Stewart
- Anatomy Section, Department of Surgery, Yale University, New Haven, CT USA
| | - Carol Kunzel
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
| | - Paulette Bernd
- Department of Medicine and Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY USA
| | - Heike Kielstein
- Institute for Anatomy and Cell Biology, Medical Faculty, Martin Luther University, Halle-Wittenberg, Germany
| | - Geoffroy P. J. C. Noël
- Anatomy Division, Department of Surgery, University of California San Diego, San Diego, CA USA
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7
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Xu J, He J, Zhou JS, Qu D, Huang SY, Chien CL. Observation of Vector Spin Seebeck Effect in a Noncollinear Antiferromagnet. Phys Rev Lett 2022; 129:117202. [PMID: 36154395 DOI: 10.1103/physrevlett.129.117202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 05/16/2022] [Accepted: 08/15/2022] [Indexed: 06/16/2023]
Abstract
Spintronic phenomena to date have been established in magnets with collinear moments, where the spin injection through the spin Seebeck effect (SSE) is always along the out-of-plane direction. Here, we report the observation of a vector SSE in a noncollinear antiferromagnet (AF) LuFeO_{3}, where temperature gradient along the out-of-plane and also the in-plane directions can both inject a pure spin current and generate a voltage in the heavy metal via the inverse spin Hall effect (ISHE). We show that the thermovoltages are due to the magnetization from canted spins in LuFeO_{3}. Furthermore, in contrast to the challenges of generating, manipulating, and detecting spin current in collinear AFs, the vector SSE in LuFeO_{3} is readily viable in zero magnetic field and can be controlled by a small magnetic field of about 150 Oe at room temperature. The noncollinear AFs expand new realms for exploring spin phenomena and provide a new route to low-field antiferromagnetic spin caloritronics and magnonics.
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Affiliation(s)
- Jinsong Xu
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Jiaming He
- Department of Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - J-S Zhou
- Department of Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - Danru Qu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Ssu-Yen Huang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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Xu X, Li Y, Chien CL. Anomalous transverse resistance in the topological superconductor β-Bi 2Pd. Nat Commun 2022; 13:5321. [PMID: 36085297 PMCID: PMC9463149 DOI: 10.1038/s41467-022-32877-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 08/08/2022] [Indexed: 11/09/2022] Open
Abstract
A supercurrent flowing in a superconductor meets no resistance. Yet an electric field may still be established within the superconductor in the presence of dissipative processes, such as vortex motion. Here we report the observation of a transverse voltage drop in superconducting β-Bi2Pd thin films. Unlike the Hall effect in general or in other superconductors, the sign of the observed transverse voltage does not depend on the external magnetic field. Instead, it is dictated by the broken inversion symmetry on the film interfaces. This anomalous transverse voltage, or transverse resistance, is indicative of a chirality that likely resonates with the topological surface states reported in β-Bi2Pd. Centrosymmetric β-Bi2Pd is a candidate topological superconductor. Here, the authors observe a transverse voltage in β-Bi2Pd thin films and propose that this voltage is a result of chiral topological surface states.
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Affiliation(s)
- Xiaoying Xu
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, 21218, USA.
| | - Yufan Li
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, 21218, USA. .,Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong.
| | - C L Chien
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, 21218, USA. .,Department of Physics, National Taiwan University, Taipei, 10617, Taiwan.
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Wu PH, Qu D, Tu YC, Lin YZ, Chien CL, Huang SY. Exploiting Spin Fluctuations for Enhanced Pure Spin Current. Phys Rev Lett 2022; 128:227203. [PMID: 35714236 DOI: 10.1103/physrevlett.128.227203] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 02/13/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
We demonstrate the interplay of pure spin current, spin-polarized current, and spin fluctuation in 3d Ni_{x}Cu_{1-x}. By tuning the compositions of the Ni_{x}Cu_{1-x} alloys, we separate the effects due to the pure spin current and spin-polarized current. By exploiting the interaction of spin current with spin fluctuation in suitable Ni-Cu alloys, we obtain an unprecedentedly high spin Hall angle of 46%, about 5 times larger than that in Pt, at room temperature. Furthermore, we show that spin-dependent thermal transport via anomalous Nernst effect can serve as a sensitive magnetometer to electrically probe the magnetic phase transitions in thin films with in-plane anisotropy. The enhancement of spin Hall angle by exploiting spin current fluctuation via composition control makes 3d magnets functional materials in charge-to-spin conversion for spintronic application.
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Affiliation(s)
- Po-Hsun Wu
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Danru Qu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Yen-Chang Tu
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - Yin-Ze Lin
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - C L Chien
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Ssu-Yen Huang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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10
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Liao ML, Yeh CC, Lue JH, Chien CL, Hsu SH, Chang MF. Benefits of a bilingual web-based anatomy atlas for nursing students in learning anatomy. BMC Med Educ 2022; 22:341. [PMID: 35505291 PMCID: PMC9064542 DOI: 10.1186/s12909-022-03405-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 04/25/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Registered nurses are required for high-quality healthcare. Thus, the anatomy course is essential regarding professional knowledge of the human body during the nursing training process. However, previous studies have indicated that anatomy teaching time and anatomy teachers were reduced and insufficient. Therefore, to improve the learning of practical anatomy in response to these difficulties, a bilingual National Taiwan University web-based anatomy atlas (NTU-WAA) was created as a cross-platform application and its feasibility was evaluated. METHODS The comparison of anatomy examination scores between nursing students of two cohorts (66 from the 2018-2019 cohort, whom was without NTU-WAA application; 54 from the 2019-2020 cohort, to whom NTU-WAA was offered) and the evaluation of questionnaires collected from nursing students of the 2019-2020 cohort and 4 anatomy teachers were carried out to define the feasibility of this strategy. RESULTS Results obtained by nursing students for the 2019-2020 cohort showed a significant increase in anatomy learning performance compared with that of the 2018-2019 cohort with reference to the laboratory midterm [2018-2019 cohort vs. 2019-2020 cohort, mean (standard deviation, SD): 77.20 (16.14) vs. 81.80 (12.03); p = 0.043], the laboratory final examination [59.68 (15.28) vs. 80.35 (13.74); p < 0.001] and the theory final examination [80.85 (10.10) vs. 84.33 (6.925); p = 0.017]. Moreover, results of the questionnaires indicated that the new bilingual cross-platform atlas was highly accepted by students and teachers. CONCLUSIONS The NTU-WAA, a bilingual web-based atlas, was evaluated as a beneficial anatomy-learning tool that may enhance self-study of nursing students with consequent amelioration of their anatomy-related performance in both theoretical and laboratory examinations. This reflection suggests the future implementation of the bilingual web-based atlas on a large scale.
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Affiliation(s)
- Meng-Lin Liao
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10051, Taipei, Taiwan
| | - Chi-Chuan Yeh
- Department of Surgery, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, 10051, Taiwan
| | - June-Horng Lue
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10051, Taipei, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10051, Taipei, Taiwan
| | - Shu-Hao Hsu
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10051, Taipei, Taiwan
| | - Ming-Fong Chang
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10051, Taipei, Taiwan.
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11
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Peng WH, Liao ML, Huang WC, Liu PK, Levi SR, Tseng YJ, Lee CY, Yeh LK, Chen KJ, Chien CL, Wang NK. Conditional Deletion of Activating Rearranged During Transfection Receptor Tyrosine Kinase Leads to Impairment of Photoreceptor Ribbon Synapses and Disrupted Visual Function in Mice. Front Neurosci 2021; 15:728905. [PMID: 34803580 PMCID: PMC8602685 DOI: 10.3389/fnins.2021.728905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 10/11/2021] [Indexed: 11/13/2022] Open
Abstract
Purpose: The rearranged during transfection (RET) receptor tyrosine kinase plays a key role in transducing signals related to cell growth and differentiation. Ret mutant mice show abnormal retinal activity and abnormal levels and morphology of bipolar cells, yet die on the 21st day after birth as a result of renal underdevelopment. To extend the observation period, we generated the Ret conditional knockout Chx10-Cre;C-Ret lx/lx mouse model and analyzed the retinal function and morphological changes in mature and aging Chx10-Cre;C-Ret lx/lx mice. Methods: Retina-specific depletion of Ret was achieved using mice with floxed alleles of the Ret gene with CHX10-driven Cre recombinase; floxed mice without Cre expression were used as controls. Retinal function was examined using electroretinography (ERG), and 2-, 4-, 12-, and 24-month-old mice were analyzed by hematoxylin staining and immunohistochemistry to evaluate retinal morphological alterations. The ultrastructure of photoreceptor synapses was evaluated using electron microscopy. Results: The results of the ERG testing showed that b-wave amplitudes were reduced in Chx10-Cre;C-Ret lx/lx mice, whereas a-waves were not affected. A histopathological analysis revealed a thinner and disorganized outer plexiform layer at the ages of 12 and 24 months in Chx10-Cre;C-Ret lx/lx mice. Moreover, the data provided by immunohistochemistry showed defects in the synapses of photoreceptor cells. This result was confirmed at the ultrastructural level, thus supporting the participation of Ret in the morphological changes of the synaptic ribbon. Conclusion: Our results provide evidence of the role of Ret in maintaining the function of the retina, which was essential for preserving the structure of the synaptic ribbon and supporting the integrity of the outer plexiform layer.
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Affiliation(s)
- Wei-Hao Peng
- School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan
| | - Meng-Lin Liao
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wan-Chun Huang
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Pei-Kang Liu
- Department of Ophthalmology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Institute of Biomedical Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan.,Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, Columbia University, New York, NY, United States
| | - Sarah R Levi
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, Columbia University, New York, NY, United States
| | - Yun-Ju Tseng
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, Columbia University, New York, NY, United States
| | - Chia-Ying Lee
- Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Lung-Kun Yeh
- Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Kuan-Jen Chen
- Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Nan-Kai Wang
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, Columbia University, New York, NY, United States
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12
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Luo EWC, Liao ML, Chien CL. Neural differentiation of glioblastoma cell lines via a herpes simplex virus thymidine kinase/ganciclovir system driven by a glial fibrillary acidic protein promoter. PLoS One 2021; 16:e0253008. [PMID: 34370752 PMCID: PMC8351974 DOI: 10.1371/journal.pone.0253008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 05/27/2021] [Indexed: 11/18/2022] Open
Abstract
Glioblastoma is a malignant brain tumor with poor prognosis that rapidly acquires resistance to available clinical treatments. The herpes simplex virus thymidine kinase/ganciclovir (HSVtk/GCV) system produces the selective elimination of HSVtk-positive cells and is a candidate for preclinical testing against glioblastoma via its ability to regulate proliferation and differentiation. Therefore, in this study, we aimed to establish a plasmid encoding the HSVtk/GCV system driven by a glial fibrillary acidic protein (GFAP) promoter and verify its possibility of neural differentiation of glioblastoma cell line under the GCV challenge. Four stable clones-N2A-pCMV-HSVtk, N2A-pGFAP-HSVtk, U251-pCMV-HSVtk, and U251-pGFAP-HSVtk-were established from neuronal N2A and glioblastoma U251 cell lines. In vitro GCV sensitivity was assessed by MTT assay for monitoring time- and dosage-dependent cytotoxicity. The capability for neural differentiation in stable glioblastoma clones during GCV treatment was assessed by performing immunocytochemistry for nestin, GFAP, and βIII-tubulin. Under GFAP promoter control, the U251 stable clone exhibited GCV sensitivity, while the neuronal N2A clones were nonreactive. During GCV treatment, cells underwent apoptosis on day 3 and dying cells were identified after day 5. Nestin was increasingly expressed in surviving cells, indicating that the population of neural stem-like cells was enriched. Lower levels of GFAP expression were detected in surviving cells. Furthermore, βIII-tubulin-positive neuron-like cells were identified after GCV treatment. This study established pGFAP-HSVtk-P2A-EGFP plasmids that successfully ablated GFAP-positive glioblastoma cells, but left neuronal N2A cells intact. These data suggest that the neural differentiation of glioblastoma cells can be promoted by treatment with the HSVtk/GCV system.
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Affiliation(s)
- Elizabeth Wei-Chia Luo
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Bioengineering, University of California, Los Angeles, California, United States of America
| | - Meng-Lin Liao
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
- School of Medicine, College of Medicine, I‐Shou University, Kaohsiung, Taiwan
- * E-mail: (CLC); (MLL)
| | - Chung-Liang Chien
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
- * E-mail: (CLC); (MLL)
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13
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Wu A, Maddula V, Singh J, Sagoo MG, Chien CL, Wingate R, Kielstein H, Traxler H, Brassett C, Waschke J, Vielmuth F, Sakurai T, Zeroual M, Olsen J, El-Batti S, Viranta-Kovanen S, Kitahara S, Keay K, Kunzel C, Bernd P, Noël GPJC. Alternatives to Student Outbound Mobility-Improving Students' Cultural Competency Skills Online to Improve Global Health Without Travel. Med Sci Educ 2021; 31:1441-1451. [PMID: 34123512 PMCID: PMC8184130 DOI: 10.1007/s40670-021-01332-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 05/20/2021] [Indexed: 06/12/2023]
Abstract
Introduction Student outbound mobility is a major element in internationalization of medical education and global health education. However, this approach is often criticized, as it is inherently inequitable. Internationalization at home is a newer concept that aims to provide students with international skills and experiences without exchange travel. We report detailed outcomes of an international online program during the COVID-19 pandemic, which aimed to include acquisition of cultural awareness and competency-similar to what the students would have obtained if they had travelled abroad. Method Sixty-eight students from 12 international universities participated in international small peer group collaborative work, and online networking. Perceived improvement of cultural competency using Likert scale and open-ended questions was used as a measure of success. Furthermore, students' definition of cultural competency in the different countries was obtained. Results Students improved their cultural competency skills. Data analysis supported statistically significant improvement of the above skills after the program, in comparison to the start of the program. Discussion Internationalization of medical education can be achieved at home-via structured online peer exchanges-and can provide students with intercultural skills and networking opportunities that are typically achieved via international in-person travel. The above represents a socially just and equitable way to reach all students and can result in improvement of their cultural competency, preparing them for their work in global health, and thereby resulting in improvement of global health. Supplementary Information The online version contains supplementary material available at 10.1007/s40670-021-01332-9.
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Affiliation(s)
- Anette Wu
- Vagelos College of Physicians and Surgeons, Columbia University, 650 W 168th St, New York, NY 10032 USA
| | - Vinay Maddula
- College of Dental Medicine, Columbia University, New York, NY USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Kevin Keay
- The University of Sydney, Sydney, Australia
| | - Carol Kunzel
- College of Dental Medicine, Columbia University, New York, NY USA
| | - Paulette Bernd
- Vagelos College of Physicians and Surgeons, Columbia University, 650 W 168th St, New York, NY 10032 USA
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14
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Wu A, Maddula V, Yu ACX, Goel R, Shimizu H, Chien CL, Wingate R, Sagoo MG, Kielstein H, Traxler H, Brassett C, Waschke J, Vielmuth F, Keay K, Zeroual M, Sakurai T, Olsen J, El-Batti S, Viranta-Kovanen S, Kitahara S, Kunzel C, Bernd P, Noel GP. An Observation of Healthcare Professions Students' Perceptions During the COVID-19 Pandemic. Med Sci Educ 2021; 31:401-409. [PMID: 33619444 PMCID: PMC7889410 DOI: 10.1007/s40670-021-01240-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/03/2021] [Indexed: 06/12/2023]
Abstract
This study conveys preclinical healthcare professions students' sentiments at 14 universities during the 2020 COVID-19 pandemic. Essays about students' thoughts and experiences were thematically sorted and revealed a variety of sentiments spanning from positive (e.g., pride, respect) to the more negative (e.g., anxiety, guilt, disappointment, anger). Themes revealed respect for the healthcare profession, but also the realization of its limitations, sacrifices, and risks. Healthcare profession educators need to be aware that the COVID-19 pandemic has affected students emotionally and may have long-term effects on the global healthcare profession. This study can serve as a historic documentation of how this generation of students felt and adds to the literature on how the pandemic affected the healthcare profession.
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Affiliation(s)
- Anette Wu
- Columbia University, New York, NY USA
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15
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Xu M, Li M, Khanal P, Habiboglu A, Insana B, Xiong Y, Peterson T, Myers JC, Ortega D, Qu H, Chien CL, Zhang W, Wang JP, Wang WG. Voltage-Controlled Antiferromagnetism in Magnetic Tunnel Junctions. Phys Rev Lett 2020; 124:187701. [PMID: 32441982 DOI: 10.1103/physrevlett.124.187701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/12/2020] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
We demonstrate a voltage-controlled exchange bias effect in CoFeB/MgO/CoFeB magnetic tunnel junctions that is related to the interfacial Fe(Co)O_{x} formed between the CoFeB electrodes and the MgO barrier. The unique combination of interfacial antiferromagnetism, giant tunneling magnetoresistance, and sharp switching of the perpendicularly magnetized CoFeB allows sensitive detection of the exchange bias. We find that the exchange bias field can be isothermally controlled by magnetic fields at low temperatures. More importantly, the exchange bias can also be effectively manipulated by the electric field applied to the MgO barrier due to the voltage-controlled antiferromagnetic anisotropy in this system.
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Affiliation(s)
- Meng Xu
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Mingen Li
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Pravin Khanal
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Ali Habiboglu
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Blake Insana
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Yuzan Xiong
- Department of Physics, Oakland University, Rochester, Michigan 48309, USA
- Department of Electrical and Computer Engineering, Oakland University, Rochester, Michigan 48309, USA
| | - Thomas Peterson
- Department of Electrical and Computer Engineering, University of Minnesota, 200 Union Street Southeast, Minneapolis, Minnesota 55455, USA
| | - Jason C Myers
- Characterization Facility, University of Minnesota, 100 Union Street Southeast, Minneapolis, Minnesota 55455, USA
| | - Deborah Ortega
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Hongwei Qu
- Department of Electrical and Computer Engineering, Oakland University, Rochester, Michigan 48309, USA
| | - C L Chien
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Wei Zhang
- Department of Physics, Oakland University, Rochester, Michigan 48309, USA
| | - Jian-Ping Wang
- Department of Electrical and Computer Engineering, University of Minnesota, 200 Union Street Southeast, Minneapolis, Minnesota 55455, USA
| | - W G Wang
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
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16
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Xu X, Li Y, Chien CL. Spin-Triplet Pairing State Evidenced by Half-Quantum Flux in a Noncentrosymmetric Superconductor. Phys Rev Lett 2020; 124:167001. [PMID: 32383961 DOI: 10.1103/physrevlett.124.167001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
A prime category of superconducting materials in which to look for spin-triplet pairing and topological superconductivity are superconductors without inversion symmetry. It is predicted that the broken parity symmetry gives rise to an admixture of spin-triplet and spin-singlet pairing states. However, experimental confirmation of pairing mixing in any material remains elusive. In this work, we perform a phase-sensitive experiment to examine the pairing state of noncentrosymmetric superconductor α-BiPd. The Little-Parks effect observed in mesoscopic polycrystalline α-BiPd rings reveals the presence of half-integer magnetic flux quantization, which provides a decisive evidence for the spin-triplet pairing state. We find both half-quantum fluxes and integer-quantum fluxes of different proportions, consistent with the scenario of an admixture of singlet-triplet pairing.
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Affiliation(s)
- Xiaoying Xu
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Yufan Li
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - C L Chien
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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17
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Liao ML, Lin TC, Chien CL. The Photoreceptor Cells in Retina and Pineal Gland of Amphibian
Hoplobatrachus rugulosus. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.09006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Wu A, Kieff M, Noel G, Wingate R, Kielstein H, Sakurai T, Viranta-Kovanen S, Chien CL, Traxler H, Waschke J, Vielmuth F, Sagoo MG, Kitahara S, Keay K, Olsen J, Bernd P. International anatomy partnerships ‐ Results of international student basic sciences internships initiated via the anatomy course. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.00516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Wu A, Noël GPJC, Wingate R, Kielstein H, Sakurai T, Viranta-Kovanen S, Chien CL, Traxler H, Waschke J, Vielmuth F, Sagoo MG, Kitahara S, Kato Y, Keay KA, Olsen J, Bernd P. An International Partnership of 12 Anatomy Departments - Improving Global Health through Internationalization of Medical Education. Ann Glob Health 2020; 86:27. [PMID: 32166068 PMCID: PMC7059426 DOI: 10.5334/aogh.2665] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Background At a time of global interconnectedness, the internationalization of medical education has become important. Anatomy as an academic discipline, with its close connections to the basic sciences and to medical education, can easily be connected with global health and internationalization of medical education. Here the authors present an international program based on a partnership between twelve anatomy departments in ten countries, on four continents. Details of a proposed plan for the future direction of the program are also discussed. Objective The aim is to improve global healthcare by preparing future global healthcare leaders via early international networking, international collaboration and exchange, intercultural experience, and connecting two seemingly distant academic disciplines - anatomy and global health - via internationalization of medical education. Methods Based in the anatomy course, the program involved early international collaboration between preclinical medical and dental students. The program provided a stepwise progression for learning about healthcare and intercultural topics beyond pure anatomy education - starting with virtual small groups of international students, who subsequently presented their work to a larger international audience during group videoconferences. The above progressed to in-person visits for research internships in the basic sciences within industrialized countries. Findings Students appreciated the international and intercultural interaction, learned about areas outside the scope of anatomy (e.g., differences in healthcare education and delivery systems, Public and Global Health challenges, health ethics, and cultural enrichment), and valued the exchange travel for basic sciences research internships and cultural experience. Conclusions This unique collaboration of international anatomy departments can represent a new role for the medical anatomy course beyond pure anatomy teaching - involving areas of global health and internationalization of medical education - and could mark a new era of international collaboration among anatomists.
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Affiliation(s)
- Anette Wu
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, US
| | | | | | - Heike Kielstein
- Institute for Anatomy and Cell Biology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), DE
| | - Takeshi Sakurai
- Medical Innovation Center of Kyoto University, Graduate School of Medicine, Kyoto, JP
| | | | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, TW
| | - Hannes Traxler
- Center for Anatomy and Cell Biology, Medical University of Vienna, Vienna, AT
| | - Jens Waschke
- Institute of Anatomy, Faculty of Medicine, Ludwig Maximilians University, Munich, DE
| | - Franziska Vielmuth
- Institute of Anatomy, Faculty of Medicine, Ludwig Maximilians University, Munich, DE
| | | | - Shuji Kitahara
- Department of Anatomy, Tokyo Women’s Medical University, Tokyo, JP
| | - Yojiro Kato
- Department of Surgery, Kidney Center, Tokyo Women’s Medical University, Tokyo, JP
| | - Kevin A. Keay
- Discipline of Anatomy and Histology, University of Sydney, Sydney, AU
| | - Jørgen Olsen
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, DK
| | - Paulette Bernd
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, US
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20
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Chiang CC, Huang SY, Qu D, Wu PH, Chien CL. Absence of Evidence of Electrical Switching of the Antiferromagnetic Néel Vector. Phys Rev Lett 2019; 123:227203. [PMID: 31868421 DOI: 10.1103/physrevlett.123.227203] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Much theoretical and experimental attention has been focused on the electrical switching of the antiferromagnetic (AFM) Néel vector via spin-orbit torque. Measurements employing multiterminal patterned structures of Pt/AFM show recurring signals of the supposedly planar Hall effect and magnetoresistance, implying AFM switching. We show in this Letter that similar signals have been observed in structures with and without the AFM layer, and of an even larger magnitude using different metals and substrates. These may not be the conclusive evidence of spin-orbit torque switching of AFM, but the thermal artifacts of patterned metal structure on substrate. Large current densities in the metallic devices, beyond the Ohmic regime, can generate unintended anisotropic thermal gradients and voltages. AFM switching requires unequivocal detection of the AFM Néel vector before and after SOT switching.
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Affiliation(s)
- C C Chiang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - S Y Huang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - D Qu
- Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
| | - P H Wu
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - C L Chien
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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21
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Chen YL, Lin HW, Chien CL, Lai YL, Sun WZ, Chen CA, Cheng WF. BTLA blockade enhances Cancer therapy by inhibiting IL-6/IL-10-induced CD19 high B lymphocytes. J Immunother Cancer 2019; 7:313. [PMID: 31753019 PMCID: PMC6868712 DOI: 10.1186/s40425-019-0744-4] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 09/20/2019] [Indexed: 01/10/2023] Open
Abstract
Background The standard treatment for epithelial ovarian carcinoma (EOC) is surgery followed by platinum/paclitaxel-based chemotherapy, but the overall survival rate is poor. The purpose of this study was to investigate the therapeutic potential of chemotherapy combined with inhibition of B and T lymphocyte attenuator (BTLA) for clinical use to treat EOC. Methods Initially, we evaluated the potential application of chemotherapy combined with anti-BTLA antibody in an animal model. We then analyzed the distribution and regulation of BTLA expression on immunocytes in vitro. Finally, we examined the correlation between BTLA expression levels in cancerous tissues and prognosis in 254 EOC cases. Results The combination of chemotherapy and anti-BTLA antibody for inhibiting BTLA significantly reduced peritoneal tumor volume and extended survival in tumor-bearing mice. In addition, BTLA could be identified mostly on B lymphocytes, especially on CD19hi B cells, rather than on T lymphocytes and natural killer cells. Under regulation of interleukins 6 and 10, more BTLA+CD19hi B lymphocytes could be induced through AKT and STAT3 signaling pathways. Detectable BTLA expression in ovarian cancerous tissues was associated with worse disease-free and overall survivals of EOC patients. Conclusions BTLA detected in cancerous tissues can predict poor outcome of EOC patients. Inhibition of BTLA combined with chemotherapy can elevate immune activation and generate potent anti-tumor effects. Thus, the combination of chemotherapy and anti-BTLA antibody may hold potential clinical application for the treatment of EOC patients. Trial registration The Trial Registration Number was NCT00854399.
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Affiliation(s)
- Yu-Li Chen
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Han-Wei Lin
- Graduate Institute of Oncology, National Taiwan University, Taipei, Taiwan
| | - Chung-Liang Chien
- Graduate Institute of Anatomy and Cell Biology, National Taiwan University, Taipei, Taiwan
| | - Yen-Ling Lai
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Wei-Zen Sun
- Department of Anesthesiology, National Taiwan University, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chi-An Chen
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan.
| | - Wen-Fang Cheng
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan. .,Graduate Institute of Oncology, National Taiwan University, Taipei, Taiwan. .,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
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22
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Li Y, Xu X, Lee MH, Chu MW, Chien CL. Observation of half-quantum flux in the unconventional superconductor β-Bi 2Pd. Science 2019; 366:238-241. [PMID: 31601768 DOI: 10.1126/science.aau6539] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 12/26/2018] [Accepted: 09/17/2019] [Indexed: 11/02/2022]
Abstract
Magnetic flux quantization is one of the defining properties of a superconductor. We report the observation of half-integer magnetic flux quantization in mesoscopic rings of superconducting β-Bi2Pd thin films. The half-quantum fluxoid manifests itself as a π phase shift in the quantum oscillation of the superconducting critical temperature. This result verifies unconventional superconductivity of β-Bi2Pd and is consistent with a spin-triplet pairing symmetry. Our findings may have implications for flux quantum bits in the context of quantum computing.
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Affiliation(s)
- Yufan Li
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA.
| | - Xiaoying Xu
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
| | - M-H Lee
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - M-W Chu
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA. .,Institute of Physics, Academia Sinica, Taipei 11519, Taiwan.,Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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23
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Wu A, Kielstein H, Sakurai T, Noel G, Viranta-Kovanen S, Chien CL, Bernd P. Internationalization of Medical Education-Building a Program to Prepare Future Leaders in Healthcare. Med Sci Educ 2019; 29:535-547. [PMID: 34457511 PMCID: PMC8368475 DOI: 10.1007/s40670-019-00695-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
In a globally interconnected world, internationalization of medical education has become increasingly important. While many programs focus on international programs for clinical students, the number of programs for preclinical medical and dental students is small. Based in the Anatomy course, the program presented here involves early international collaborations between preclinical students from six countries. Our work involves small-group video sessions and a large international student videoconference (including cultural and didactic components). The online connections progress with in-person basic sciences summer internships undertaken at the international partner institutions. This collaborative program features unique elements that facilitate cultural exchange and help develop leadership skills in healthcare early in a student's career. We present recommendations for international program implementation.
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Affiliation(s)
- Anette Wu
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, 650 W 168th St, New York, NY 10032 USA
| | - Heike Kielstein
- Department of Anatomy and Cell Biology, Medical Faculty, Martin Luther University Halle-Wittenberg, Grosse Steinstrasse 52, 06108 Halle (Saale), Germany
| | - Takeshi Sakurai
- Department of Drug Discovery Medicine, Medical Innovation Center, Kyoto University Graduate School of Medicine, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, 606-8507 Japan
| | - Geoffroy Noel
- Department of Anatomy and Cell Biology, Faculty of Medicine, McGill University, Montreal, Canada
| | - Suvi Viranta-Kovanen
- Department of Anatomy, School of Medicine, University of Helsinki, Helsinki, Finland
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Paulette Bernd
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, 650 W 168th St, New York, NY 10032 USA
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24
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Chou PC, Tsai YC, Chen SJ, Tsai LK, Chien CL. Intracerebral transplantation of erythropoietin-producing fibroblasts facilitates neurogenesis and functional recovery in an ischemic stroke model. Brain Behav 2019; 9:e01274. [PMID: 30920178 PMCID: PMC6520520 DOI: 10.1002/brb3.1274] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 02/28/2019] [Accepted: 03/06/2019] [Indexed: 12/18/2022] Open
Abstract
INTRODUCTION Erythropoietin (EPO) can enhance neurogenesis and fibroblasts can secrete growth factors; together, they may benefit ischemic stroke. We transplanted EPO-producing fibroblasts into the rodent infarcted brain to test their effect on neurogenesis and functional recovery. METHODS A total of 106 cells of EPO-producing NIH/3T3 fibroblasts (EPO/EGFP/3T3) or enhanced green fluorescence protein (EGFP)-expressing fibroblasts (EGFP/3T3) were stereotaxically injected into the infarcted striatum of adult rats that received transient middle cerebral artery occlusion (MCAO) surgery 1 day poststroke. On day 14 after MCAO, the animals were euthanized for the evaluation of neurogenesis via immunohistochemistry and of the expression of growth factors using enzyme-linked immunosorbent assay. The infarct volume was analyzed using magnetic resonance imaging and the neurological behavior was assessed using the neurological severity scoring performed within 14 days after MCAO. RESULTS The MCAO rats with EPO/EGFP/3T3 treatment showed high EPO expression in the infarcted brain for at least 1 week. The concentration of brain-derived neurotrophic factor was higher in both hemispheres of MCAO rats with either EGFP/3T3 or EPO/EGFP/3T3 treatment at 14 days poststroke compared with untreated MCAO rats. The number of Ki-67-, nestin-, or doublecortin-immunoreactive cells in bilateral subventricular zones was higher in EPO/EGFP/3T3-treated MCAO rats than it was in untreated MCAO control animals, indicating the enhancement of neurogenesis after EPO/EGFP/3T3 treatment. Notably, post-MCAO EPO/EGFP/3T3 treatment significantly reduced infarct size and improved functional recovery. CONCLUSION The intracerebral transplantation of EPO-producing fibroblasts benefited an ischemic stroke model probably via the enhancement of neurogenesis.
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Affiliation(s)
- Pin-Chun Chou
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Chieh Tsai
- Department of Neurology and Stroke Center, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Shiu-Jau Chen
- Department of Medicine, Mackay Medical College, New Taipei City, Taiwan
| | - Li-Kai Tsai
- Department of Neurology and Stroke Center, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Chung-Liang Chien
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
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25
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Sun NY, Chen YL, Lin HW, Chiang YC, Chang CF, Tai YJ, Chen CA, Sun WZ, Chien CL, Cheng WF. Immune checkpoint Ab enhances the antigen-specific anti-tumor effects by modulating both dendritic cells and regulatory T lymphocytes. Cancer Lett 2018; 444:20-34. [PMID: 30543813 DOI: 10.1016/j.canlet.2018.11.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 11/29/2018] [Accepted: 11/29/2018] [Indexed: 01/03/2023]
Abstract
We determined the anti-tumor effects and possible mechanisms of an antigen-specific DNA vaccine combined with PD-1 or CTLA-4 blockade. Using the HPV16 E6/E7+ syngeneic mouse tumor model, we investigated whether anti-CTLA-4 antibody (Ab) or anti-PD-1 Ab increases the antigen-specific anti-tumor effects and immune response induced by CTGF/E7 chimeric DNA vaccine and the possible mechanisms. Anti-PD-1 Ab or anti-CTLA-4 Ab combined with E7-specific DNA vaccine generated more potent antigen-specific immunity, including anti-E7 Abs and the number and cytotoxic activity of E7-specific cytotoxic CD8+ T lymphocytes, and anti-tumor effects than E7-specific DNA vaccine alone. In addition, the number of systemic and intratumoral Tregs was lower with the anti-PD-1 or anti-CTLA-4 Ab and E7-specific DNA vaccine. Furthermore, anti-PD-1 and anti-CTLA-4 Abs could enhance the maturation and abilities of intratumoral DCs to activate E7-specific cytotoxic CD8+ T cells. Immune checkpoint blockade overcomes the immunosuppressive status of the tumor-microenvironment to enhance the antigen-specific immunity and anti-tumor effects generated by an antigen-specific DNA vaccine. Antigen-specific immunotherapy combined with immune checkpoint blockade can be a novel strategy in clinical cancer therapy.
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Affiliation(s)
- Nai-Yun Sun
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yu-Li Chen
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Han-Wei Lin
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Ying-Cheng Chiang
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chi-Fang Chang
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Jou Tai
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chi-An Chen
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wei-Zen Sun
- Department of Anesthesiology, College of Medicine, National Taiwan University, Taipei, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chung-Liang Chien
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wen-Fang Cheng
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan; Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
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26
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Liao ML, Peng WH, Kan D, Chien CL. Distribution patterns of the zebrafish neuronal intermediate filaments inaa and inab. J Neurosci Res 2018; 97:202-214. [PMID: 30387501 DOI: 10.1002/jnr.24347] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 09/27/2018] [Accepted: 10/03/2018] [Indexed: 01/27/2023]
Abstract
It has been reported that the neuronal intermediate filament (IF) α-internexin may plays a role in the formation of the neuronal cytoskeleton during mammalian development. From a phylogenetic viewpoint, zebrafish express inaa and inab as homologs of mammalian α-internexin. However, the distribution patterns of the inaa and inab proteins throughout zebrafish development have not been well-characterized. We generated antibodies specific for zebrafish inaa and inab and analyzed the distribution of these two proteins in developing zebrafish. Inaa was identified in the major subdivisions of embryonic and larval brains as early as 1 day postfertilization (dpf), including the telencephalon, optic tectum, and cerebellum, and inab was also detected in the same regions from 3 dpf to the adult stage. Moreover, we demonstrated for the first time that inaa was distinctively expressed in the photoreceptor-like cells of the pineal gland, where inab was sparsely detected. Besides, the expression of inaa in male adult fish was found to be stable under different photoperiod conditions. Thus, we suggest that inaa is one of useful markers for studies of zebrafish cone photoreceptors not only in the retina but also in the pineal gland. In conclusion, we report that the distribution patterns of inaa and inab are phylogenetically conserved in the telencephalon, optic tectum, and cerebellum. Moreover, inaa and inab had different expression patterns in the pineal gland and retina during zebrafish development. Both inaa and inab are neuronal IFs and their functional roles may be different in various aspects of zebrafish neuronal development.
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Affiliation(s)
- Meng-Lin Liao
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wei-Hau Peng
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan.,School of Medicine for International Student, College of Medicine, I-Shou University (Yanchao Campus), Kaohsiung, Taiwan
| | - Daphne Kan
- Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan.,Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
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27
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Yue D, Lin W, Li J, Jin X, Chien CL. Spin-to-Charge Conversion in Bi Films and Bi/Ag Bilayers. Phys Rev Lett 2018; 121:037201. [PMID: 30085781 DOI: 10.1103/physrevlett.121.037201] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 05/24/2018] [Indexed: 06/08/2023]
Abstract
Thermally injected pure spin current phenomena have been investigated in Bi/Y_{3}Fe_{5}O_{12} and Bi/Ag/Y_{3}Fe_{5}O_{12} structures at room temperature. We show that although pure spin current has been injected into the Bi layer and the Bi/Ag bilayer, there is little detectable signal of spin-to-charge conversion, except the distinctive Nernst signal from the Bi layer, in sharp contrast to the inverse Rashba-Edelstein effect claimed in these systems.
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Affiliation(s)
- Di Yue
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
| | - Weiwei Lin
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Jiajia Li
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
| | - Xiaofeng Jin
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
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28
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Hsin WC, Chang CH, Chang CY, Peng WH, Chien CL, Chang MF, Chang SC. Nucleocapsid protein-dependent assembly of the RNA packaging signal of Middle East respiratory syndrome coronavirus. J Biomed Sci 2018; 25:47. [PMID: 29793506 PMCID: PMC5966903 DOI: 10.1186/s12929-018-0449-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 05/15/2018] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Middle East respiratory syndrome coronavirus (MERS-CoV) consists of a positive-sense, single-stranded RNA genome and four structural proteins: the spike, envelope, membrane, and nucleocapsid protein. The assembly of the viral genome into virus particles involves viral structural proteins and is believed to be mediated through recognition of specific sequences and RNA structures of the viral genome. METHODS AND RESULTS A culture system for the production of MERS coronavirus-like particles (MERS VLPs) was determined and established by electron microscopy and the detection of coexpressed viral structural proteins. Using the VLP system, a 258-nucleotide RNA fragment, which spans nucleotides 19,712 to 19,969 of the MERS-CoV genome (designated PS258(19712-19969)ME), was identified to function as a packaging signal. Assembly of the RNA packaging signal into MERS VLPs is dependent on the viral nucleocapsid protein. In addition, a 45-nucleotide stable stem-loop substructure of the PS258(19712-19969)ME interacted with both the N-terminal domain and the C-terminal domain of the viral nucleocapsid protein. Furthermore, a functional SARS-CoV RNA packaging signal failed to assemble into the MERS VLPs, which indicated virus-specific assembly of the RNA genome. CONCLUSIONS A MERS-oV RNA packaging signal was identified by the detection of GFP expression following an incubation of MERS VLPs carrying the heterologous mRNA GFP-PS258(19712-19969)ME with virus permissive Huh7 cells. The MERS VLP system could help us in understanding virus infection and morphogenesis.
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Affiliation(s)
- Wei-Chen Hsin
- Institute of Microbiology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan
| | - Chan-Hua Chang
- Institute of Microbiology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan
| | - Chi-You Chang
- Institute of Microbiology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan
| | - Wei-Hao Peng
- Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan
| | - Chung-Liang Chien
- Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan
| | - Ming-Fu Chang
- Institute of Biochemistry and Molecular Biology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan.
| | - Shin C Chang
- Institute of Microbiology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, First Section, Taipei, 100, Taiwan.
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29
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Liu T, Li Y, Gu L, Ding J, Chang H, Janantha PAP, Kalinikos B, Novosad V, Hoffmann A, Wu R, Chien CL, Wu M. Nontrivial Nature and Penetration Depth of Topological Surface States in SmB_{6} Thin Films. Phys Rev Lett 2018; 120:207206. [PMID: 29864320 DOI: 10.1103/physrevlett.120.207206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Indexed: 06/08/2023]
Abstract
The nontrivial feature and penetration depth of the topological surface states (TSS) in SmB_{6} were studied via spin pumping. The experiments used SmB_{6} thin films grown on the bulk magnetic insulator Y_{3}Fe_{5}O_{12} (YIG). Upon the excitation of magnetization precession in the YIG, a spin current is generated in the SmB_{6} that produces, via spin-orbit coupling, a lateral electrical voltage in the film. This spin-pumping voltage signal becomes considerably stronger as the temperature decreases from 150 to 10 K, and such an enhancement most likely originates from the spin-momentum locking of the TSS and may thereby serve as evidence for the nontrivial nature of the TSS. The voltage data also show a unique film thickness dependence that suggests a TSS depth of ∼32 nm. The spin-pumping results are supported by transport measurements and analyses using a tight binding model.
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Affiliation(s)
- Tao Liu
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Yufan Li
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Lei Gu
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - Junjia Ding
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Houchen Chang
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - P A Praveen Janantha
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Boris Kalinikos
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
- St. Petersburg Electrotechnical University, St. Petersburg 197376, Russia
| | - Valentyn Novosad
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Axel Hoffmann
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Ruqian Wu
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Mingzhong Wu
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
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30
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Ma Q, Li Y, Gopman DB, Kabanov YP, Shull RD, Chien CL. Switching a Perpendicular Ferromagnetic Layer by Competing Spin Currents. Phys Rev Lett 2018; 120:117703. [PMID: 29601763 DOI: 10.1103/physrevlett.120.117703] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Indexed: 06/08/2023]
Abstract
An ultimate goal of spintronics is to control magnetism via electrical means. One promising way is to utilize a current-induced spin-orbit torque (SOT) originating from the strong spin-orbit coupling in heavy metals and their interfaces to switch a single perpendicularly magnetized ferromagnetic layer at room temperature. However, experimental realization of SOT switching to date requires an additional in-plane magnetic field, or other more complex measures, thus severely limiting its prospects. Here we present a novel structure consisting of two heavy metals that delivers competing spin currents of opposite spin indices. Instead of just canceling the pure spin current and the associated SOTs as one expects and corroborated by the widely accepted SOTs, such devices manifest the ability to switch the perpendicular CoFeB magnetization solely with an in-plane current without any magnetic field. Magnetic domain imaging reveals selective asymmetrical domain wall motion under a current. Our discovery not only paves the way for the application of SOT in nonvolatile technologies, but also poses questions on the underlying mechanism of the commonly believed SOT-induced switching phenomenon.
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Affiliation(s)
- Qinli Ma
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Yufan Li
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - D B Gopman
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Yu P Kabanov
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
- Institute for Solid Physics, RAS, Chernogolovka 142432, Russia
| | - R D Shull
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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31
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Wong CW, Chen YT, Chien CL, Yu TY, Rwei SP, Hsu SH. A simple and efficient feeder-free culture system to up-scale iPSCs on polymeric material surface for use in 3D bioprinting. Materials Science and Engineering: C 2018; 82:69-79. [DOI: 10.1016/j.msec.2017.08.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/21/2017] [Accepted: 08/10/2017] [Indexed: 10/19/2022]
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32
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Hsieh MH, Chen YT, Chen YT, Lee YH, Lu J, Chien CL, Chen HF, Ho HN, Yu CJ, Wang ZQ, Teng SC. PARP1 controls KLF4-mediated telomerase expression in stem cells and cancer cells. Nucleic Acids Res 2017; 45:10492-10503. [PMID: 28985359 PMCID: PMC5737510 DOI: 10.1093/nar/gkx683] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 07/24/2017] [Indexed: 12/21/2022] Open
Abstract
Telomerase is highly expressed in cancer and embryonic stem cells (ESCs) and implicated in controlling genome integrity, cancer formation and stemness. Previous studies identified that Krüppel-like transcription factor 4 (KLF4) activates telomerase reverse transcriptase (TERT) expression and contributes to the maintenance of self-renewal in ESCs. However, little is known about how KLF4 regulates TERT expression. Here, we discover poly(ADP-ribose) polymerase 1 (PARP1) as a novel KLF4-interacting partner. Knockdown of PARP1 reduces TERT expression and telomerase activity not only in cancer cells, but also in human and mouse ESCs. Recruitment of KLF4 to TERT promoter is reduced in PARP1-suppressed cells. The poly(ADP-ribose) polymerase activity is dispensable, while the oligo(ADP-ribose) polymerase activity is required for the PARP1- and KLF4-mediated TERT activation. Repression of Parp1 in mouse ESCs decreases expression of pluripotent markers and induces differentiation. These results suggest that PARP1 recruits KLF4 to activate telomerase expression and stem cell pluripotency, indicating a positive regulatory role of the PARP1–KLF4 complex in telomerase expression in cancer and stem cells.
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Affiliation(s)
- Meng-Hsun Hsieh
- Department of Microbiology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Yi-Ting Chen
- Department of Microbiology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - You-Tzung Chen
- Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Yi-Hsuan Lee
- Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Jean Lu
- Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Chung-Liang Chien
- Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Hsin-Fu Chen
- Department of Obstetrics and Gynecology and Institute of Internal Medicine, National Taiwan University Hospital, Taipei 100, Taiwan.,Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Hong-Nerng Ho
- Department of Obstetrics and Gynecology and Institute of Internal Medicine, National Taiwan University Hospital, Taipei 100, Taiwan.,Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Chia-Jung Yu
- Department of Cell and Molecular Biology, College of Medicine, Chang Gung University, Tao-Yuan 333, Taiwan.,Department of Thoracic Medicine, Chang Gung Memorial Hospital, Linkou, Tao-Yuan 333, Taiwan
| | - Zhao-Qi Wang
- Leibniz Institute on Aging-Fritz Lipmann Institute (FLI), 07745 Jena, Germany
| | - Shu-Chun Teng
- Department of Microbiology, College of Medicine, National Taiwan University, Taipei 100, Taiwan.,Ph.D. Program in Translational Medicine, National Taiwan University and Academia Sinica, Taipei 100, Taiwan
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Lin W, Chien CL. Electrical Detection of Spin Backflow from an Antiferromagnetic Insulator/Y_{3}Fe_{5}O_{12} Interface. Phys Rev Lett 2017; 118:067202. [PMID: 28234519 DOI: 10.1103/physrevlett.118.067202] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Indexed: 06/06/2023]
Abstract
Spin Hall magnetoresistance (SMR) has been observed in Pt/NiO/Y_{3}Fe_{5}O_{12} (YIG) heterostructures with characteristics very different from those in Pt/YIG. This phenomenon indicates that a spin current generated by the spin Hall effect in Pt transmits through the insulating NiO and is reflected from the NiO/YIG interface. The SMR in Pt/NiO/YIG shows a strong temperature dependence dominated by effective spin conductance, due to antiferromagnetic magnons and spin fluctuation. Inverted SMR has been observed below a temperature which increases with the NiO thickness, suggesting a spin-flip reflection from the antiferromagnetic NiO exchange coupled with the YIG.
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Affiliation(s)
- Weiwei Lin
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Pu CM, Liu CW, Liang CJ, Yen YH, Chen SH, Jiang-Shieh YF, Chien CL, Chen YC, Chen YL. Adipose-Derived Stem Cells Protect Skin Flaps against Ischemia/Reperfusion Injury via IL-6 Expression. J Invest Dermatol 2017; 137:1353-1362. [PMID: 28163069 DOI: 10.1016/j.jid.2016.12.030] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 12/19/2016] [Accepted: 12/29/2016] [Indexed: 12/26/2022]
Abstract
Flap necrosis is the most frequent postoperative complication encountered in reconstructive surgery. We elucidated whether adipose-derived stem cells (ADSCs) and their derivatives might induce neovascularization and protect skin flaps during ischemia/reperfusion (I/R) injury. Flaps were subjected to 3 hours of ischemia by ligating long thoracic vessels and then to blood reperfusion. Qtracker-labeled ADSCs, ADSCs in conditioned medium (ADSC-CM), or ADSC exosomes (ADSC-Exo) were injected into the flaps. These treatments led to significantly increased flap survival and capillary density compared with I/R on postoperative day 5. IL-6 levels in the cell lysates or in conditioned medium were significantly higher in ADSCs than in Hs68 fibroblasts. ADSC-CM and ADSC-Exo increased tube formation. This result was corroborated by a strong decrease in skin repair after adding IL-6-neutralizing antibodies or small interfering RNA for IL-6 ADSCs. ADSC transplantation also increased flap recovery in I/R injury of IL-6-knockout mice. IL-6 was secreted from ADSCs through signal transducer and activator of transcription phosphorylation, and then IL-6 stimulated angiogenesis and enhanced recovery after I/R injury by the classic signaling pathway. The mechanism of skin recovery includes the direct differentiation of ADSCs into endothelial cells and the indirect effect of IL-6 released from ADSCs. ADSC-CM and ADSC-Exo could be used as off-the-shelf products for this therapy.
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Affiliation(s)
- Chi-Ming Pu
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan; Division of Plastic Surgery, Department of Surgery, Cathay General Hospital, Taipei, Taiwan
| | - Chen-Wei Liu
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chan-Jung Liang
- Lipid Science and Aging Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yu-Hsiu Yen
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan; Division of Plastic Surgery, Department of Surgery, Cathay General Hospital, Taipei, Taiwan
| | - Shun-Hua Chen
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ya-Fen Jiang-Shieh
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Ya-Chun Chen
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yuh-Lien Chen
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan.
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35
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Liao ML, Peng WH, Kan D, Chien CL. Developmental pattern of the neuronal intermediate filament inaa in the zebrafish retina. J Comp Neurol 2016; 524:3810-3826. [PMID: 27159642 DOI: 10.1002/cne.24033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 04/28/2015] [Accepted: 04/29/2016] [Indexed: 12/17/2022]
Abstract
α-Internexin is a member of the neuronal intermediate filament (nIF) protein family, which also includes peripherin and neurofilament (NF) triplet proteins. Previous studies found that expression of α-internexin precedes that of the NF triplet proteins in mammals and suggested that α-internexin plays a key role in the neuronal cytoskeleton network during development. In this study, we aimed to analyze the expression patterns and function of internexin neuronal intermediate filament protein-alpha a (inaa), the encoding gene of which is a homolog of the mammalian α-internexin, during retinal development in zebrafish. Via in vitro and in vivo studies, we demonstrated that zebrafish inaa is an α-internexin homolog that shares characteristics with nIFs. An immunohistochemical analysis of zebrafish revealed that inaa was distributed dynamically in the developing retina. It was widely localized in retinal neuroepithelial cells at 1 day postfertilization (dpf), and was mainly found in the ganglion cell layer (GCL) and inner part of the inner nuclear layer (INL) from 3-9 dpf; after 14 dpf, it was restricted to the outer nuclear layer (ONL). Moreover, we demonstrated for the first time that inaa acted distinctively from the cytoskeletal scaffold of zebrafish cone photoreceptors during development. In conclusion, we demonstrated the morphological features of a novel nIF, inaa, and illustrated its developmental expression pattern in the zebrafish retina. J. Comp. Neurol. 524:3810-3826, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Meng-Lin Liao
- Department of Anatomy and Cell Biology, College of Medicine; National Taiwan University; Taipei Taiwan
| | - Wei-Hau Peng
- Department of Anatomy and Cell Biology, College of Medicine; National Taiwan University; Taipei Taiwan
| | - Daphne Kan
- Center of Genomic Medicine; National Taiwan University; Taipei Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine; National Taiwan University; Taipei Taiwan
- Center of Genomic Medicine; National Taiwan University; Taipei Taiwan
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36
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Lee WD, Wang KC, Tsai YF, Chou PC, Tsai LK, Chien CL. Subarachnoid Hemorrhage Promotes Proliferation, Differentiation, and Migration of Neural Stem Cells via BDNF Upregulation. PLoS One 2016; 11:e0165460. [PMID: 27832087 PMCID: PMC5104421 DOI: 10.1371/journal.pone.0165460] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 10/12/2016] [Indexed: 11/18/2022] Open
Abstract
Patients who suffer from subarachnoid hemorrhage (SAH) usually have long-term neurological impairments. Endogenous neurogenesis might play a potential role in functional recovery after SAH; however, the underlying neurogenesis mechanism is still unclear. We assessed the extent of neurogenesis in the subventricular zone (SVZ) to better understand the neurogenesis mechanism after SAH. We performed a rat model of SAH to examine the extent of neurogenesis in the SVZ and assessed functional effects of the neurotrophic factors in the cerebrospinal fluid (CSF) on neural stem cells (NSCs) after SAH. In this study, the proliferation, differentiation, and migratory capacities of NSCs in the SVZ were significantly increased on days 5 and 7 post SAH. Furthermore, treatment of cultured rat fetal NSCs with the CSF collected from rats on days 5 and 7 post SAH enhanced their proliferation, differentiation, and migration. Enzyme-linked immunosorbent assay (ELISA) of the CSF detected a marked increase in the concentration of brain-derived neurotrophic factor (BDNF). Treating the cultured NSCs with recombinant BDNF (at the same concentration as that in the CSF) or with CSF from SAH rats, directly, stimulated proliferation, differentiation, and migration to a similar extent. BDNF expression was upregulated in the SVZ of rats on days 5 and 7 post SAH, and BDNF release occurred from NSCs, astrocytes, and microglia in the SVZ. These results indicate that SAH triggers the expression of BDNF, which promotes the proliferation, differentiation, and migration of NSCs in the SVZ after SAH.
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Affiliation(s)
- Wen-Di Lee
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Kuo-Chuan Wang
- Department of Surgery, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yi-Fen Tsai
- Department of Surgery, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Pin-Chun Chou
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Li-Kai Tsai
- Department of Neurology and Stroke Center, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
- * E-mail: (CLC); (LKT)
| | - Chung-Liang Chien
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
- * E-mail: (CLC); (LKT)
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Abstract
PURPOSE Treatment of meniscus tears is a persistent challenge in orthopedics. Although cell therapies have shown promise in promoting fibrocartilage formation in in vitro and preclinical studies, clinical application has been limited by the paucity of autologous tissue and the need for ex vivo cell expansion. Rapid dissociation of the free edges of the anterior and posterior meniscus with subsequent implantation in a meniscus lesion may overcome these limitations. The purpose of this study was to explore the effect of rapidly dissociated meniscus tissue in enhancing neotissue formation in a radial meniscus tear, as simulated in an in vitro explant model. MATERIALS AND METHODS All experiments in this study, performed at minimum with biological triplicates, utilized meniscal tissues from hind limbs of young cows. The effect of varying collagenase concentration (0.1%, 0.2% and 0.5% w/v) and treatment duration (overnight and 30 minutes) on meniscus cell viability, organization of the extracellular matrix (ECM), and gene expression was assessed through a cell metabolism assay, microscopic examination, and quantitative real-time reverse transcription polymerase chain reaction analysis, respectively. Thereafter, an explant model of a radial meniscus tear was used to evaluate the effect of a fibrin gel seeded with one of the following: (1) fibrin alone, (2) isolated and passaged (P2) meniscus cells, (3) overnight digested tissue, and (4) rapidly dissociated tissue. The quality of in vitro healing was determined through histological analysis and derivation of an adhesion index. RESULTS Rapid dissociation in 0.2% collagenase yielded cells with higher levels of metabolism than either 0.1% or 0.5% collagenase. When seeded in a three-dimensional fibrin hydrogel, both overnight digested and rapidly dissociated cells expressed greater levels of collagens type I and II than P2 meniscal cells at 1 week. At 4 and 8 weeks, collagen type II expression remained elevated only in the rapid dissociation group. Histological examination revealed enhanced healing in all cell-seeded treatment groups over cell-free fibrin controls at weeks 1, 4, and 8, but there were no significant differences across the treatment groups. CONCLUSIONS Rapid dissociation of meniscus tissue may provide a single-step approach to augment regenerative healing of meniscus repairs.
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Affiliation(s)
- Piya-On Numpaisal
- a Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery , University of Pittsburgh School of Medicine , Pittsburgh , PA , USA.,b Department of Anatomy and Cell Biology , College of Medicine, National Taiwan University , Taipei , Taiwan.,c Institute of Medicine, Suranaree University of Technology , Nakhon Ratchasima , Thailand
| | - Benjamin B Rothrauff
- a Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery , University of Pittsburgh School of Medicine , Pittsburgh , PA , USA.,d McGowan Institute for Regenerative Medicine, University of Pittsburgh , Pittsburgh , PA , USA
| | - Riccardo Gottardi
- a Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery , University of Pittsburgh School of Medicine , Pittsburgh , PA , USA.,e Ri.MED Foundation , Palermo , Italy
| | - Chung-Liang Chien
- b Department of Anatomy and Cell Biology , College of Medicine, National Taiwan University , Taipei , Taiwan
| | - Rocky S Tuan
- a Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery , University of Pittsburgh School of Medicine , Pittsburgh , PA , USA.,d McGowan Institute for Regenerative Medicine, University of Pittsburgh , Pittsburgh , PA , USA
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Lin W, Chen K, Zhang S, Chien CL. Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator. Phys Rev Lett 2016; 116:186601. [PMID: 27203336 DOI: 10.1103/physrevlett.116.186601] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Indexed: 06/05/2023]
Abstract
We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.
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Affiliation(s)
- Weiwei Lin
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Kai Chen
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Shufeng Zhang
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Chao CC, Kan D, Lo TH, Lu KS, Chien CL. Induction of neural differentiation in rat C6 glioma cells with taxol. Brain Behav 2015; 5:e00414. [PMID: 26665000 PMCID: PMC4667627 DOI: 10.1002/brb3.414] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 09/14/2015] [Accepted: 09/21/2015] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Glioblastoma is a common and aggressive type of primary brain tumor. Several anticancer drugs affect GBM (glioblastoma multiforme) cells on cell growth and morphology. Taxol is one of the widely used antineoplastic drugs against many types of solid tumors, such as breast, ovarian, and prostate cancers. However, the effect of taxol on GBM cells remains unclear and requires further investigation. METHODS Survival rate of C6 glioma cells under different taxol concentrations was quantified. To clarify the differentiation patterns of rat C6 glioma cells under taxol challenge, survived glioma cells were characterized by immunocytochemical, molecular biological, and cell biological approaches. RESULTS After taxol treatment, not only cell death but also morphological changes, including cell elongation, cellular processes thinning, irregular shapes, and fragmented nucleation or micronuclei, occurred in the survived C6 cells. Neural differentiation markers NFL (for neurons), β III-tubulin (for neurons), GFAP (for astrocytes), and CNPase (for oligodendrocytes) were detected in the taxol-treated C6 cells. Quantitative analysis suggested a significant increase in the percentage of neural differentiated cells. The results exhibited that taxol may trigger neural differentiation in C6 glioma cells. Increased expression of neural differentiation markers in C6 cells after taxol treatment suggest that some anticancer drugs could be applied to elimination of the malignant cancer cells as well as changing proliferation and differentiation status of tumor cells.
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Affiliation(s)
- Chuan-Chuan Chao
- Department of Anatomy and Cell Biology College of Medicine National Taiwan University Taipei Taiwan
| | - Daphne Kan
- Center of Genomic Medicine National Taiwan University Taipei Taiwan
| | - Ta-Hsuan Lo
- Center of Genomic Medicine National Taiwan University Taipei Taiwan
| | - Kuo-Shyan Lu
- Department of Anatomy and Cell Biology College of Medicine National Taiwan University Taipei Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology College of Medicine National Taiwan University Taipei Taiwan; Center of Genomic Medicine National Taiwan University Taipei Taiwan
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Li YC, Chen SJ, Chien CL. Erythropoietin produced by genetic-modified NIH/3T3 fibroblasts enhances the survival of degenerating neurons. Brain Behav 2015; 5:e00356. [PMID: 26357589 PMCID: PMC4559019 DOI: 10.1002/brb3.356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/12/2015] [Accepted: 05/04/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Erythropoietin (EPO) has potent neuroprotective effects. The short-term delivery of high-dose EPO seemed to improve patients' neuromuscular functions; however, excessive EPO resulted in systematically high hematocrit and thrombotic risk. In our study, we established a cellular material for future in vivo studies of neurodegenerative diseases based on EPO provided regionally at a nontoxic level. METHODS A mouse EPO cDNA was subcloned into the pCMS-EGFP vector and transfected into NIH/3T3 fibroblasts to design a biological provider that can regionally release EPO for the treatment of neurological diseases. After G418 selection, a stable EPO-overexpressing cell line, EPO-3T3-EGFP, was established. To further confirm the neuroprotective abilities of secreted EPO from EPO-3T3-EGFP cells, a cell model of neurodegeneration, PC12-INT-EGFP, was applied. RESULTS The expression level of EPO was highly elevated in EPO-3T3-EGFP cells, and an abundant amount of EPO secreted from EPO-3T3-EGFP cells was detected in the extracellular milieu. After supplementation with conditioned medium prepared from EPO-3T3-EGFP cells, the survival rate of PC12-INT-EGFP cells was significantly enhanced. Surprisingly, a fraction of aggregated cytoskeletal EGFP-tagged α-internexin in PC12-INT-EGFP cells was disaggregated and transported into neurites dynamically. The immunocytochemical distribution of IF proteins, including NF-M, phosphorylated-NF-M, and the α-INT-EGFP fusion protein, were less aggregated in the perikaryal region and transported into neurites after the EPO treatment. CONCLUSION The established EPO-overexpressing NIH/3T3 cell line, EPO-3T3-EGFP, may provide a material for future studies of cell-based therapies for neurodegenerative diseases via the secretion of EPO on a short-term, high-dose, regional basis.
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Affiliation(s)
- Yi-Chin Li
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University Taipei, Taiwan
| | - Shiu-Jau Chen
- Department of Medicine, Mackay Medical College New Taipei, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University Taipei, Taiwan
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Chao CC, Kan D, Lu KS, Chien CL. The role of microRNA-30c in the self-renewal and differentiation of C6 glioma cells. Stem Cell Res 2015; 14:211-23. [PMID: 25698399 DOI: 10.1016/j.scr.2015.01.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 01/04/2015] [Accepted: 01/26/2015] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Sphere formation, one method for identifying self-renewal ability, has been used to report that cancer stem-like cells exist in rat C6 glioma cells. Recent studies suggested that cancer stem-like cells share the stem cell properties of self-renewal and multipotent ability of neural stem cells and might be regulated by microRNAs (miRNAs). However, the mechanism of miRNA involvement in the sphere formation and neural differentiation abilities of cancer stem-like cells is poorly understood. RESULTS We found that miRNA-30c could assist in sphere formation of C6 cells under defined conditions in neural stem cell medium DMEM/F12-bFGF-EGF-B27. Moreover, overexpression of miRNA-30c might reduce 3-isobutyl-1-methylxanthine (IBMX)-induced neural differentiation, as the expression of neural markers, especially glial fibrillary acidic protein (GFAP), decreased. Further experiments revealed that miRNA-30c inhibited the IBMX-induced astrocyte differentiation via targeting the upstream genes and inactivating phosphorylation of STAT3 of the JAK-STAT3 pathway. Subsequently, the expression of GFAP was reduced and the number of astrocyte differentiation from C6 cells decreased. CONCLUSIONS Our findings suggest that miRNA-30c could play a regulatory role in self-renewal and neural differentiation in C6 glioma cells.
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Affiliation(s)
- Chuan-Chuan Chao
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 100, Taiwan
| | - Daphne Kan
- Center of Genomic Medicine, National Taiwan University, 6F., No. 2, Syu-Jhou Road, Taipei 100, Taiwan
| | - Kuo-Shyan Lu
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 100, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 100, Taiwan; Center of Genomic Medicine, National Taiwan University, 6F., No. 2, Syu-Jhou Road, Taipei 100, Taiwan.
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42
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Hou PS, Huang WC, Chiang W, Lin WC, Chien CL. Impaired neural differentiation potency by retinoic acid receptor-α pathway defect in induced pluripotent stem cells. Cell Reprogram 2014; 16:467-76. [PMID: 25364979 DOI: 10.1089/cell.2014.0029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Induced pluripotent stem cells (iPSCs) are reprogrammed from somatic cells via ectopic gene expression and, similarly to embryonic stem cells (ESCs), possess powerful abilities to self-renew and differentiate into cells of various lineages. However, the neural differentiation potency of iPSCs remains unknown. In this study, we demonstrated the neural differentiation ability of iPSCs compared with ESCs using an retinoic acid (RA) induction system. The neural differentiation efficiency of iPSCs was obviously lower than that of ESCs. Retinoic acid receptor-α (RARα) was critical in the RA-induced neural differentiation of iPSCs, and the effect of RARα was confirmed by applying a specific RARα antagonist ER50891 to ESCs. These findings indicate that iPSCs do not possess the complete properties that ESCs have.
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Affiliation(s)
- Pei-Shan Hou
- 1 Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University , Taipei, 100, Taiwan
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Abstract
A new type of magnetoresistance (MR) observed in Pt/YIG when nominally nonmagnetic Pt comes in contact with a ferrimagnetic insulator yttrium iron garnet (YIG) has drawn intense experimental and theoretical interest. In this Letter, we experimentally demonstrate two physical origins of the new MR: a spin current across the Pt/YIG interface and the magnetic proximity effect. The new MR can also be reproduced when Pt is in contact with a nonmagnetic insulator doped with a few percent of Fe impurities. By tuning the YIG surface and inserting an Au layer between the Pt and YIG, we are able to separate the two contributions.
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Affiliation(s)
- B F Miao
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA and National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
| | - S Y Huang
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - D Qu
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Chen HF, Jan PS, Kuo HC, Wu FC, Lan CW, Huang MC, Chien CL, Ho HN. Granulosa cells and retinoic acid co-treatment enrich potential germ cells from manually selected Oct4-EGFP expressing human embryonic stem cells. Reprod Biomed Online 2014; 29:319-32. [PMID: 25047539 DOI: 10.1016/j.rbmo.2014.05.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [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: 10/18/2013] [Revised: 05/13/2014] [Accepted: 05/13/2014] [Indexed: 10/25/2022]
Abstract
Differentiation of human embryonic stem (HES) cells to germ cells may become clinically useful in overcoming diseases related to germ-cell development. Niches were used to differentiate HES cell lines, NTU1 and H9 Oct4-enhanced green fluorescence protein (EGFP), including laminin, granulosa cell co-culture or conditioned medium, ovarian stromal cell co-culture or conditioned medium, retinoic acid, stem cell factor (SCF) and BMP4-BMP7-BMP8b treatment. Flow cytometry showed that granulosa cell co-culture (P < 0.001) or conditioned medium (P = 0.007) treatment for 14 days significantly increased the percentages of differentiated H9 Oct4-EGFP cells expressing early germ cell marker stage-specific embryonic antigen 1(SSEA1); sorted SSEA1[+] cells did not express higher levels of germ cell gene VASA and GDF9. Manually collected H9 Oct4-EGFP[+] cells expressed significantly higher levels of VASA (P = 0.005) and GDF9 (P = 0.001). H9 Oct4-EGFP[+] cells developed to ovarian follicle-like structures after culture for 28 days but with low efficiency. Unlike SCF and BMP4, retinoic acid co-treatment enhanced VASA, GDF9 and SCP3 expression. A protocol is recommended to enrich differentiated HES cells with germ-cell potential by culture with granulosa cells, conditioned medium or retinoic acid, manual selection of Oct4-EGFP[+] cells, and analysis of VASA, GDF9 expression, or both.
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Affiliation(s)
- Hsin-Fu Chen
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, College of Medicine and the Hospital, National Taiwan University, Taipei, Taiwan; Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Pey-Shynan Jan
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, College of Medicine and the Hospital, National Taiwan University, Taipei, Taiwan
| | - Hung-Chih Kuo
- Institute of Cellular and Organismic Biology and Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Fang-Chun Wu
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, College of Medicine and the Hospital, National Taiwan University, Taipei, Taiwan
| | - Chen-Wei Lan
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Mei-Chi Huang
- Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chung-Liang Chien
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hong-Nerng Ho
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, College of Medicine and the Hospital, National Taiwan University, Taipei, Taiwan; Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei, Taiwan; Graduate Institute of Immunology, College of Medicine, National Taiwan University, Taipei, Taiwan.
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Hong JB, Chou FJ, Ku AT, Fan HH, Lee TL, Huang YH, Yang TL, Su IC, Yu IS, Lin SW, Chien CL, Ho HN, Chen YT. A nucleolus-predominant piggyBac transposase, NP-mPB, mediates elevated transposition efficiency in mammalian cells. PLoS One 2014; 9:e89396. [PMID: 24586748 PMCID: PMC3933532 DOI: 10.1371/journal.pone.0089396] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Accepted: 01/20/2014] [Indexed: 11/25/2022] Open
Abstract
PiggyBac is a prevalent transposon system used to deliver transgenes and functionally explore the mammalian untouched genomic territory. The important features of piggyBac transposon are the relatively low insertion site preference and the ability of seamless removal from genome, which allow its potential uses in functional genomics and regenerative medicine. Efforts to increase its transposition efficiency in mammals were made through engineering the corresponding transposase (PBase) codon usage to enhance its expression level and through screening for mutant PBase variants with increased enzyme activity. To improve the safety for its potential use in regenerative medicine applications, site-specific transposition was achieved by using engineered zinc finger- and Gal4-fused PBases. An excision-prone PBase variant has also been successfully developed. Here we describe the construction of a nucleolus-predominant PBase, NP-mPB, by adding a nucleolus-predominant (NP) signal peptide from HIV-1 TAT protein to a mammalian codon-optimized PBase (mPB). Although there is a predominant fraction of the NP-mPB-tGFP fusion proteins concentrated in the nucleoli, an insertion site preference toward nucleolar organizer regions is not detected. Instead a 3–4 fold increase in piggyBac transposition efficiency is reproducibly observed in mouse and human cells.
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Affiliation(s)
- Jin-Bon Hong
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
- Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - Fu-Ju Chou
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Amy T. Ku
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Hsiang-Hsuan Fan
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Tung-Lung Lee
- Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - Yung-Hsin Huang
- Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - Tsung-Lin Yang
- Department of Otolaryngology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
| | - I-Chang Su
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - I-Shing Yu
- Transgenic Mouse Model Core Facility of the National Research Program for Genomic Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
- Laboratory Animal Center, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Shu-Wha Lin
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, Taipei, Taiwan
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Chung-Liang Chien
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
- Stem Cell Core Laboratory, National Taiwan University Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Anatomy and Cell Biology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Hong-Nerng Ho
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
- Stem Cell Core Laboratory, National Taiwan University Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - You-Tzung Chen
- Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
- Stem Cell Core Laboratory, National Taiwan University Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
- Genome and Systems Biology Program, National Taiwan University, Taipei, Taiwan
- * E-mail:
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Hong JH, Lee WC, Hsu YM, Liang HJ, Wan CH, Chien CL, Lin CY. Characterization of the biochemical effects of naphthalene on the mouse respiratory system using NMR-based metabolomics. J Appl Toxicol 2014; 34:1379-88. [PMID: 24478122 DOI: 10.1002/jat.2970] [Citation(s) in RCA: 23] [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: 09/13/2013] [Revised: 11/08/2013] [Accepted: 11/08/2013] [Indexed: 11/09/2022]
Abstract
Naphthalene is a ubiquitous environmental pollutant to which humans are exposed. Previous studies have demonstrated that naphthalene causes bronchiolar epithelial necrosis in the mouse distal airway, after parenteral administration. In this study, metabolic variations in the bronchoalveolar lavage fluid (BALF) and the lung tissues of naphthalene-treated mice and controls were examined using nuclear magnetic resonance (NMR)-based metabolomics to identify the toxic mechanism. Male ICR mice were treated with naphthalene [0, 50, 100 and 200 mg kg(-1), intraperitoneally (i.p.)]. After 24 h, BALF and lung tissues were collected and prepared for (1)H and J-resolved (JRES) NMR analysis after principal component analysis (PCA). PCA modeling of p-JRES spectra from the BALF, as well as hydrophilic and hydrophobic lung metabolites, enabled the high-dose group to be discriminated from the control group; increased levels of isopropanol, ethane, and acetone and lower levels of ethanol, acetate, formate, and glycerophosphocholine were detected in the BALF of mice treated with higher doses of naphthalene. Furthermore, increased isopropanol and phosphorylcholine-containing lipid levels and decreased succinate and glutamine levels were discovered in the lungs of naphthalene-exposed mice. These metabolic changes may be related to lipid peroxidation, disruptions of membrane components and imbalanced energy supply, and these results may partially explain the loss of cell membrane integrity in the airway epithelial cells of naphthalene-treated mice. We conclude that NMR-based metabolomic studies on BALF and lung tissues are a powerful tool to understand the mechanisms underlying respiratory toxicity.
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Affiliation(s)
- Jia-Huei Hong
- Institute of Environmental Health, College of Public Health, National Taiwan University, Taipei, 10055, Taiwan, Republic of China
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Liu CH, Chien CL. Molecular cloning and characterization of chicken neuronal intermediate filament protein α-internexin. J Comp Neurol 2013; 521:2147-64. [PMID: 23224860 DOI: 10.1002/cne.23278] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 09/19/2012] [Accepted: 11/28/2012] [Indexed: 01/20/2023]
Abstract
α-Internexin is one of the neuronal intermediate filament (IF) proteins, which also include low-, middle-, and high-molecular-weight neurofilament (NF) triplet proteins, designated NFL, NFM, and NFH, respectively. The expression of α-internexin occurs in most neurons as they begin differentiation and precedes the expression of the NF triplet proteins in mammals. However, little is known about the gene sequence and physiological function of α-internexin in avians. In this study we describe the molecular cloning of the mRNA sequence encoding the chicken α-internexin (chkINA) protein from embryonic brains. The gene structure and predicted amino acid sequence of chkINA exhibited high similarity to those of its zebrafish, mouse, rat, bovine, and human homologs. Data from transient-transfection experiments show that the filamentous pattern of chkINA was found in transfected cells and colocalized with other endogenous IFs, as demonstrated via immunocytochemistry using a chicken-specific antibody. The expression of chkINA was detected at the early stage of development and increased during the developmental process of the chicken. chkINA was expressed widely in chicken brains and colocalized with NF triplet proteins in neuronal processes, as assessed using immunohistochemistry. We also found that chkINA was expressed abundantly in the developing cerebellum and was the major IF protein in the parallel processes of granule neurons. Thus, we suggest that chkINA is a neuron-specific IF protein that may be a useful marker for studies of chicken brain development.
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Affiliation(s)
- Chi-Hsiu Liu
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei 10051, Taiwan ROC
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Chen TY, Chien CL. Chen and Chien reply. Phys Rev Lett 2013; 111:139704. [PMID: 24116825 DOI: 10.1103/physrevlett.111.139704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Indexed: 06/02/2023]
Affiliation(s)
- T Y Chen
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
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Abstract
The inverse spin Hall effect (ISHE) has been observed only in nonmagnetic metals, such as Pt and Au, with a strong spin-orbit coupling. We report the observation of ISHE in a ferromagnetic permalloy (Py) on ferromagnetic insulator yttrium iron garnet (YIG). Through controlling the spin current injection by altering the Py-YIG interface, we have isolated the spin current contribution and demonstrated the ISHE in a ferromagnetic metal, the reciprocal phenomenon of the anomalous Hall effect. A large spin Hall angle in Py, determined from Py thin films of different thicknesses, indicates many other ferromagnetic metals may be exploited as superior pure spin current detectors and for applications in spin current.
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Affiliation(s)
- B F Miao
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Chen YL, Cheng WF, Chang MC, Lin HW, Huang CT, Chien CL, Chen CA. Interferon-gamma in ascites could be a predictive biomarker of outcome in ovarian carcinoma. Gynecol Oncol 2013; 131:63-8. [PMID: 23917082 DOI: 10.1016/j.ygyno.2013.07.105] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 07/24/2013] [Accepted: 07/25/2013] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The ovarian cancer-associated ascites is an ideal material for evaluating the interaction between the host immune system and cancer cells in the tumor micro-environment. The aim of this study was to investigate whether the selected target cytokine expression levels in ascites could serve as an immune biomarker for predicting outcomes in ovarian cancer. METHODS Eighty-eight specimens of ovarian cancer-associated ascites were evaluated to select the target cytokine by a cytokine profiling kit. The 144 total samples were subsequently analyzed for this target cytokine. The correlation between the target cytokine and clinical characteristics was analyzed. RESULTS Interferon-gamma (IFN-γ) was identified as the target cytokine. Higher levels of IFN-γ in the ascites of the tumor micro-environment were associated with advanced disease (p=0.012), higher tumor histological grading (p=0.004), and sub-optimal surgical status (p=0.040). By multivariate analysis, the adjusted hazard ratios (HRs) were 2.74 (95% confidence interval (CI) 1.85-4.05, p<0.001) for disease-free survival (DFS) and 1.72 (95% CI 1.01-2.93, p=0.048) for overall survival (OS) for a 10-fold increase in IFN-γ concentration in the ascites. An inverse dose-response relationship between IFN-γ level and survival was also noted (Ptrend<0.001 for DFS and Ptrend<0.042 for OS). CONCLUSIONS Patients with ovarian cancer and higher IFN-γ expression levels in cancer-associated ascites will have shorter DFS and OS. IFN-γ levels in the ascites may be a prognostic marker and a potential reference for immunotherapy targeting IFN-γ.
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Affiliation(s)
- Yu-Li Chen
- Graduate Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan; Gynecologic Cancer Center, Department of Obstetrics and Gynecology, Cathay General Hospital, Taipei, Taiwan; Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
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