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Lee CN, Chiu LH, Fang CL, Yeh SD, Zuo CS, Chen SC, Kuo LK, Wang YM, Lai WFT. Synthesis, Characterization, and Application of Superparamagnetic Iron Oxide Nanoprobes for Extrapulmonary Tuberculosis Detection. J Vis Exp 2020. [PMID: 32116301 DOI: 10.3791/58227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
A molecular imaging probe comprising superparamagnetic iron oxide (SPIO) nanoparticles and Mycobacterium tuberculosis surface antibody (MtbsAb) was synthesized to enhance imaging sensitivity for extrapulmonary tuberculosis (ETB). An SPIO nanoprobe was synthesized and conjugated with MtbsAb. The purified SPIO-MtbsAb nanoprobe was characterized using TEM and NMR. To determine the targeting ability of the probe, SPIO-MtbsAb nanoprobes were incubated with Mtb for in vitro imaging assays and injected into Mtb-inoculated mice for in vivo investigation with magnetic resonance (MR). The contrast enhancement reduction on magnetic resonance imaging (MRI) of Mtb and THP1 cells showed proportional to the SPIO-MtbsAb nanoprobe concentration. After 30 min of intravenous SPIO-MtbsAb nanoprobe injection into Mtb-infected mice, the signal intensity of the granulomatous site was enhanced by 14-fold in the T2-weighted MR images compared with that in mice receiving PBS injection. The MtbsAb nanoprobes can be used as a novel modality for ETB detection.
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Affiliation(s)
- Chun-Nin Lee
- Department of Pulmonary and Critical Care Medicine, Taipei Medical University-Shuang Ho Hospital
| | - Li-Hsuan Chiu
- Department of Research and Department of Dentistry, Taipei Medical University / Shuang-Ho Hospital; McLean Imaging Center, McLean Hospital/Harvard Medical School
| | | | - Shauh-Der Yeh
- Department of Urology, School of Medicine, College of Medicine, Taipei Medical University
| | - Chun S Zuo
- McLean Imaging Center, McLean Hospital/Harvard Medical School
| | - Shih-Ching Chen
- Department of Physical Medicine and Rehabilitation, School of Medicine, College of Medicine, Taipei Medical University
| | - Li-Kuo Kuo
- Department of Medicine, Mackay Medical College
| | - Yun-Ming Wang
- Department of Biological Science and Technology, National Chiao Tung University;
| | - Wen-Fu Thomas Lai
- Department of Research and Department of Dentistry, Taipei Medical University / Shuang-Ho Hospital; McLean Imaging Center, McLean Hospital/Harvard Medical School; Graduate Institute of Clinical Medicine, Taipei Medical University;
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Lin CC, Chang WHS, Cheng TM, Chiu LH, Wang YH, Lin CAJ, Ho YS, Zuo CS, Wang YM, Lai WFT. Two new, near-infrared, fluorescent probes as potential tools for imaging bone repair. Sci Rep 2020; 10:2580. [PMID: 32054952 PMCID: PMC7018698 DOI: 10.1038/s41598-020-59522-1] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 01/14/2020] [Indexed: 11/30/2022] Open
Abstract
A precise imaging technique to evaluate osteogenesis, osteodifferentiation, and osseointegration following peri-implant surgery is in high clinical demand. Herein, we report the generation of two new, near-infrared (NIR) fluorescent probes for use in the molecular imaging of bone repair. The first probe aims to monitor the in vitro differentiation of human mesenchymal stem cells (MSCs) into osteoblasts. A NIR fluorochrome was conjugated to a cyclic peptide that binds to integrin α5β1, a factor that promotes osteogenesis in MSCs and therefore functioned as an osteoblast-specific marker. The second probe aims to monitor osteogenesis, and was generated by conjugating the drug pamidronate to a NIR fluorescent gold nanocluster. Pamidronate specifically binds to hydroxyapatite (HA), a mineral present in bone that is produced by osteoblasts, and therefore provides a functional marker for new bone formation. Our results show that both probes bind to their specific targets in vitro-differentiated osteoblasts, and not to undifferentiated MSCs, and emit NIR fluorescence for functional detection. This in vitro work demonstrates the ability of these probes to bind to active osteoblasts and their mineral deposits and highlight their potential utility as clinical tools for the imaging of the osseointegration process at the molecular level.
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Affiliation(s)
- Chien-Chou Lin
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | | | - Tsai-Mu Cheng
- Ph.D. Program for Translational Medicine, College of Medicine and Technology, Taipei Medical University, Taipei, Taiwan
| | - Li-Hsuan Chiu
- McLean Imaging Center, McLean Hospital, Harvard Medical School, Belmont, MA, USA
- Department of Research and Department of Dentistry, Taipei Medical University/Shuang-Ho Hospital, New Taipei City, Taiwan
| | - Yen-Hsun Wang
- Department of Biological Science and Technology, Institute of Molecular Medicine and Bioengineering, Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Chiao Tung University, Hsinchu, Taiwan
| | - Cheng-An J Lin
- Department of Biomedical Engineering, Chung Yuan Christian University, Chung-Li, Taiwan
| | - Yuan-Soon Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chun S Zuo
- McLean Imaging Center, McLean Hospital, Harvard Medical School, Belmont, MA, USA
| | - Yun-Ming Wang
- Department of Biological Science and Technology, Institute of Molecular Medicine and Bioengineering, Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Chiao Tung University, Hsinchu, Taiwan.
| | - Wen-Fu Thomas Lai
- McLean Imaging Center, McLean Hospital, Harvard Medical School, Belmont, MA, USA.
- Institute of Graduate Clinical Medicine, Taipei Medical University, Taipei, Taiwan.
- Department of Research and Department of Dentistry, Taipei Medical University/Shuang-Ho Hospital, New Taipei City, Taiwan.
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Bowley JF, Lai WFT. Rotational Restoration Resistance and Future Possibilities for Digital Impression Technology: Literature Review and Survey Data. Compend Contin Educ Dent 2019; 40:e1-e6. [PMID: 31730360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Digital impression procedures increasingly have been utilized to capture final impressions of fixed prosthodontic preparations in the natural tooth and single-implant restorations as well as for fixed partial dentures in both conditions. The literature related to restoration resistance to rotational displacement has been reviewed. Many digital camera systems have "open architecture" with the generation of generic standard tessellation language (STL) files. These STL files can be analyzed by software to determine preparation attribute-compliance with evidence-based standards. This literature review presents an overview of the knowledge base and survey data of US certified dental technicians (CDTs) and Canadian registered dental technicians (RDTs). The technician data reveal opinions about the level of clinician compliance with standards from the literature and possible future developments for additional applications of this emerging technology.
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Affiliation(s)
- John F Bowley
- Chief, Dental Service, Department of Veterans Affairs Boston Healthcare System, Jamaica Plain, Massachusetts; Lecturer, Restorative Dentistry and Biomaterials Science, Harvard School of Dental Medicine, Boston, Massachusetts; Professor, Restorative Sciences and Biomaterials, Boston University Henry M. Goldman School of Dental Medicine, Boston, Massachusetts
| | - Wen-Fu Thomas Lai
- Professor Emeritus, Center for Nano-tissue Engineering and Imaging Research, Taipei Medical University Hospital, Taipei, Taiwan, ROC; Research Associate-Psychiatry, Brain Imaging Center McLean Hospital, Harvard Medical School, Belmont, Massachusetts
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Wang KH, Wan R, Chiu LH, Tsai YH, Fang CL, Bowley JF, Chen KC, Shih HN, Thomas Lai WF. Correction: Effects of collagen matrix and bioreactor cultivation on cartilage regeneration of a full-thickness critical-size knee joint cartilage defects with subchondral bone damage in a rabbit model. PLoS One 2018; 13:e0199567. [PMID: 29912981 PMCID: PMC6005531 DOI: 10.1371/journal.pone.0199567] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Wang KH, Wan R, Chiu LH, Tsai YH, Fang CL, Bowley JF, Chen KC, Shih HN, Lai WFT. Effects of collagen matrix and bioreactor cultivation on cartilage regeneration of a full-thickness critical-size knee joint cartilage defects with subchondral bone damage in a rabbit model. PLoS One 2018; 13:e0196779. [PMID: 29746554 PMCID: PMC5945026 DOI: 10.1371/journal.pone.0196779] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 04/19/2018] [Indexed: 12/23/2022] Open
Abstract
Cartilage has limited self-repair ability. The purpose of this study was to investigate the effects of different species of collagen-engineered neocartilage for the treatment of critical-size defects in the articular joint in a rabbit model. Type II and I collagen obtained from rabbits and rats was mixed to form a scaffold. The type II/I collagen scaffold was then mixed with rabbit chondrocytes to biofabricate neocartilage constructs using a rotating cell culture system [three-dimensional (3D)-bioreactor]. The rabbit chondrocytes were mixed with rabbit collagen scaffold and rat collagen scaffold to form neoRBT (neo-rabbit cartilage) and neoRAT (neo-rat cartilage) constructs, respectively. The neocartilage matrix constructs were implanted into surgically created defects in rabbit knee chondyles, and histological examinations were performed after 2 and 3 months. Cartilage-like lacunae formation surrounding the chondrocytes was noted in the cell cultures. After 3 months, both the neoRBT and neoRAT groups showed cartilage-like repair tissue covering the 5-mm circular, 4-mm-deep defects that were created in the rabbit condyle and filled with neocartilage plugs. Reparative chondrocytes were aligned as apparent clusters in both the neoRAT and neoRBT groups. Both neoRBT and neoRAT cartilage repair demonstrated integration with healthy adjacent tissue; however, more integration was obtained using the neoRAT cartilage. Our data indicate that different species of type II/I collagen matrix and 3D bioreactor cultivation can facilitate cartilage engineering in vitro for the repair of critical-size defect.
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Affiliation(s)
- Kuo-Hwa Wang
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, ROC
- Department of Obstetrics and Gynecology, Chung Kang branch, Cheng Ching Hospital, Taichung, Taiwan, ROC
| | - Richard Wan
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, ROC
| | - Li-Hsuan Chiu
- Department of Research, Taipei Medical University-Shaung-Ho Hospital, Taipei, Taiwan, ROC
- McLean Imaging Center, McLean Hospital, Harvard Medical School, Belmont, MA, United States of America
| | - Yu-Hui Tsai
- Department of Research, Taipei Medical University-Shaung-Ho Hospital, Taipei, Taiwan, ROC
| | - Chia-Lang Fang
- Department of Pathology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan, ROC
| | - John F. Bowley
- Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, MA, United States of America
| | - Kuan-Chou Chen
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, ROC
| | - Hsin-Nung Shih
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Chang Gung University, Linkou Taoyuan, Taiwan, ROC
- * E-mail: (HNS); (WFTL)
| | - Wen-Fu Thomas Lai
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, ROC
- Department of Research, Taipei Medical University-Shaung-Ho Hospital, Taipei, Taiwan, ROC
- McLean Imaging Center, McLean Hospital, Harvard Medical School, Belmont, MA, United States of America
- * E-mail: (HNS); (WFTL)
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Tsai HL, Chiu WT, Fang CL, Hwang SM, Renshaw PF, Lai WFT. Different forms of tenascin-C with tenascin-R regulate neural differentiation in bone marrow-derived human mesenchymal stem cells. Tissue Eng Part A 2015; 20:1908-21. [PMID: 24829055 DOI: 10.1089/ten.tea.2013.0188] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Mesenchymal stem cells (MSCs) are currently thought to transdifferentiate into neural lineages under specific microenvironments. Studies have reported that the tenascin family members, tenascin-C (TnC) and tenascin-R (TnR), regulate differentiation and migration, in addition to neurite outgrowth and survival in numerous types of neurons and mesenchymal progenitor cells. However, the mechanisms by which TnC and TnR affect neuronal differentiation are not well understood. In this study, we hypothesized that different forms of tenascin might regulate the neural transdifferentiation of human bone marrow-derived mesenchymal stem cells. Human MSCs were cultured in media incorporated with soluble tenascins, or on precoated tenascins. In a qualitative polymerase chain reaction analysis, adding a soluble TnC and TnR mixture to the medium significantly enhanced the expression of neuronal and glial markers, whereas no synaptic markers were expressed. Conversely, in groups of cells treated with coated TnC, hMSCs showed neurite outgrowth and synaptic marker expression. After being treated with coated TnR, hMSCs exhibited neuronal differentiation; however, it inhibited neurite outgrowth and synaptic marker expression. A combination of TnC and TnR significantly promoted hMSC differentiation in neurons or oligodendrocytes, induced neurite formation, and inhibited differentiation into astrocytes. Furthermore, the effect of the tenascin mixture showed dose-dependent effects, and a mixture ratio of 1:1 to 1:2 (TnC:TnR) provided the most obvious differentiation of neurons and oligodendrocytes. In a functional blocking study, integrin α7 and α9β1-blocking antibodies inhibited, respectively, 80% and 20% of mRNA expression by hMSCs in the coated tenascin mixture. In summary, the coated combination of TnC and TnR appeared to regulate neural differentiation signaling through integrin α7 and α9β1 in bone marrow-derived hMSCs. Our findings demonstrate novel mechanisms by which tenascin regulates neural differentiation, and enable the use of cell therapy to treat neurodegenerative diseases.
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Affiliation(s)
- Hung-Li Tsai
- 1 Graduate Institute of Medical Sciences, Taipei Medical University , Taipei, Taiwan
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Tsai HL, Deng WP, Lai WFT, Chiu WT, Yang CB, Tsai YH, Hwang SM, Renshaw PF. Wnts enhance neurotrophin-induced neuronal differentiation in adult bone-marrow-derived mesenchymal stem cells via canonical and noncanonical signaling pathways. PLoS One 2014; 9:e104937. [PMID: 25170755 PMCID: PMC4149376 DOI: 10.1371/journal.pone.0104937] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Accepted: 07/16/2014] [Indexed: 01/01/2023] Open
Abstract
Wnts were previously shown to regulate the neurogenesis of neural stem or progenitor cells. Here, we explored the underlying molecular mechanisms through which Wnt signaling regulates neurotrophins (NTs) in the NT-induced neuronal differentiation of human mesenchymal stem cells (hMSCs). NTs can increase the expression of Wnt1 and Wnt7a in hMSCs. However, only Wnt7a enables the expression of synapsin-1, a synaptic marker in mature neurons, to be induced and triggers the formation of cholinergic and dopaminergic neurons. Human recombinant (hr)Wnt7a and general neuron makers were positively correlated in a dose- and time-dependent manner. In addition, the expression of synaptic markers and neurites was induced by Wnt7a and lithium, a glycogen synthase kinase-3β inhibitor, in the NT-induced hMSCs via the canonical/β-catenin pathway, but was inhibited by Wnt inhibitors and frizzled-5 (Frz5) blocking antibodies. In addition, hrWnt7a triggered the formation of cholinergic and dopaminergic neurons via the non-canonical/c-jun N-terminal kinase (JNK) pathway, and the formation of these neurons was inhibited by a JNK inhibitor and Frz9 blocking antibodies. In conclusion, hrWnt7a enhances the synthesis of synapse and facilitates neuronal differentiation in hMSCS through various Frz receptors. These mechanisms may be employed widely in the transdifferentiation of other adult stem cells.
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Affiliation(s)
- Hung-Li Tsai
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, Taiwan
| | - Wing-Ping Deng
- Graduate Institute of Biomedical Materials and Engineering, Taipei Medical University, Taipei, Taiwan
| | - Wen-Fu Thomas Lai
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, Taiwan
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan
- McLean Imaging Center, McLean Hospital/Harvard Medical School, Belmont, Massachusetts, United States of America
- Center for Nano-Tissue Engineering and Image Research, Taipei Medical University Hospital, Taipei, Taiwan
- * E-mail:
| | - Wen-Ta Chiu
- Center for Nano-Tissue Engineering and Image Research, Taipei Medical University Hospital, Taipei, Taiwan
- Department of Neurosurgery, Taipei Medical University-Shuan-Ho Hospital, Taipei, Taiwan
| | - Charn-Bing Yang
- Department of Orthopedics, Taipei County Hospital, Taipei, Taiwan
| | - Yu-Hui Tsai
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, Taiwan
| | - Shiaw-Min Hwang
- Bioresource Collection and Research Center, Food Industry Research and Development Institute, Hsinchu, Taiwan
| | - Perry F. Renshaw
- Department of Psychiatry and The Brain Institute, University of Utah, Salt Lake City, Utah, United States of America
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Wu YW, Chen SC, Lai WFT, Chen YC, Tsai YH. Screening of flavonoids for effective osteoclastogenesis suppression. Anal Biochem 2012; 433:48-55. [PMID: 23072982 DOI: 10.1016/j.ab.2012.10.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 10/04/2012] [Accepted: 10/05/2012] [Indexed: 12/11/2022]
Abstract
Flavonoids are natural compounds derived from plants and some of them have been shown to inhibit osteoclast formation, implicating their potential use for the treatment of osteoporosis. Conventionally, the screening of antiosteoclastic agents is a tedious process that requires visual counting of the number of osteoclasts produced. The purpose of this study was to establish an easier and faster method for screening the antiosteoclastogenic flavonoids by using an enzyme assay. Tartrate-resistant acid phosphatase (TRAP) is a marker enzyme of the osteoclast. Results obtained demonstrated that cellular TRAP activity tended to correlate with the number of osteoclasts formed. However, the secreted TRAP activity was actually responsible for the resorption activities of the functional osteoclasts. Consequently, the effectiveness of antiosteoclastogenic agents was screened for by assessing their inhibition on receptor activator of NF-κB ligand (RANKL)-induced TRAP secretion. The half-inhibitory concentrations of flavonoids on TRAP secretion were employed as indices to compare the effectiveness of various flavonoids. The effective flavonoids also exhibited similar inhibitory potencies in the pit-formation analysis. This protocol provides a rapid analysis to screen for effective antiosteoclastogenic agents.
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Affiliation(s)
- Yu-Wei Wu
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan
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Chen CH, Wang CW, Hsu MI, Huang YH, Lai WFT, Tzeng CR. Bioluminescence imaging as a tool to evaluate germ cells in vitro and transplantation in vivo as fertility preservation of prepubertal male mice. Fertil Steril 2012; 97:1192-8. [PMID: 22424616 DOI: 10.1016/j.fertnstert.2012.02.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2011] [Revised: 01/31/2012] [Accepted: 02/02/2012] [Indexed: 01/08/2023]
Abstract
OBJECTIVE To determine the feasibility of bioluminescence imaging (BLI) to evaluate the efficiency of germ cell transplantation in vitro and in vivo in fertility preservation for infertile male mice. DESIGN Transgenic mouse model. SETTING University-based teaching hospital. ANIMAL(S) Transgenic mice. INTERVENTION(S) Busulfan was used to induce testicular failure in 3-week-old immature FVB/NJNarl wild-type recipient mice. At 8 weeks of age they received hemizygotic germinal cells from 3-week-old immature male FVB/N-Tg (PolII-luc) Ltc strain transgenic donor mice, transplanted into the seminiferous tubules. MAIN OUTCOME MEASURE(S) Isolated germinal cells were suspended in multiwell plates with the bioluminescent substrate d-luciferin in excess to quantify viable germ cells in vitro. Quantitatively in vivo BLI was applied to demonstrate the efficiency and success of transplantation and BLI of live pups born from wild-type in vivo. RESULT(S) Live birth pup of FVB/N-Tg (PolII-luc) Ltc transgenic mouse were born and imaged by bioluminescence after mating FVB/NJNarl female wild-type and male wild-type infertile recipient 4-6 months after transplantation of germinal cells of FVB/N-Tg (PolII-luc). CONCLUSION(S) The BLI could be applied successfully to this transgenic small animal model. It proved a useful tool for quantifying germ cells in vitro and for assessing the efficacy of germ cell transplantation in vivo.
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Affiliation(s)
- Chi-Huang Chen
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
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Chen CH, Yeh YC, Wu GJ, Huang YH, Lai WFT, Liu JY, Tzeng CR. Tracking the rejection and survival of mouse ovarian iso- and allografts in vivo with bioluminescent imaging. Reproduction 2010; 140:105-12. [PMID: 20423932 DOI: 10.1530/rep-09-0448] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The applications of in vivo bioluminescent imaging (BLI) with a luciferase reporter gene occur widely across biomedical fields. Luciferase-transgenic mice are highly useful donors for tracking transplanted ovarian tissues. Realizing the full potential of this system may greatly benefit the study of the physiological behaviour and function of transplanted grafts, and the rapid and reliable evaluation of new transplantation protocols. The ovarian tissues of donor FVB/N-Tg(PolII-Luc)Ltc transgenic mice, with a luciferase transgene as the reporter, were transplanted into iso/allogeneic recipients. Rejection, ovarian function and BLI were quantitatively analysed in vivo over time. The BLI of the ovarian isografts revealed longer survival than that of allografts, even with cyclosporine A (CsA) treatment. The CD4(+)/CD8(+) ratios of peripheral T-cells were significantly reduced in allografts compared with those in isografts (P<0.0001) during rejection, whereas CD19(+) cell numbers were higher in allografts. The infiltration of CD4(+)/CD8(+) cells into the graft was unremarkable in isografts from day 1, but was strong in allografts from day 8 onwards. Hormone activity revealed complete oestrus cycles in the isografts but only the dioestrus stage in the allografts. These results demonstrate that BLI in vivo expedites the fast throughput and fate maps of ovarian grafts. The use of BLI to longitudinally monitor ovarian grafts for immunorejection demonstrated the short survival of allografts and the much longer survival of isografts. CsA treatment alone is ineffective against the acute rejection of ovarian allografts.
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Affiliation(s)
- Chi-Huang Chen
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei 110, Taiwan, ROC
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Chen CWD, Boiteau RM, Lai WFT, Barger SW, Cataldo AM. sAPP Enhances the Transdifferentiation of Adult Bone Marrow Progenitor Cells to Neuronal Phenotypes. Curr Alzheimer Res 2006; 3:63-70. [PMID: 16472205 DOI: 10.2174/156720506775697205] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The remediation of neurodegeneration and cognitive decline in Alzheimer's Disease (AD) remains a challenge to basic scientists and clinicians. It has been suggested that adult bone marrow stem cells can transdifferentiate into different neuronal phenotypes. Here we demonstrate that the alpha-secretase-cleaved fragment of the amyloid precursor protein (sAPPalpha), a potent neurotrophic factor, potentiates the nerve growth factor (NGF)/retinoic acid (RA) induced transdifferentiation of bone marrow-derived adult progenitor cells (MAPCs) into neural progenitor cells and, more specifically, enhances their terminal differentiation into a cholinergic-like neuronal phenotype. The addition of sAPPalpha to NGF/RA-stimulated MAPCs resulted in their conversion to neuronal-like cells as evidenced by the extension of neurites and the appearance of immature synaptic complexes. MAPCs differentiated in the presence of sAPPalpha and NGF/RA exhibited a 40% to as much as 75% increase in neuronal proteins including NeuN, beta-tubulin III, NFM, and synaptophysin, compared to MAPCs differentiated by NGF/RA alone. This process was accompanied by an increase in the levels of choline acetyltransferase, a marker of cholinergic neurons, compared to those of GABAergic and dopaminergic neuronal subtypes. MAPCs immunopositive for sAPPalpha were identified within the septohippocampal system of transgenic PS/APP mice injected intravenously with sAPPalpha-transfected MAPCs and found in close proximity to the cerebral vasculature. Given that in AD cholinergic neurons are severely vulnerable to neurodegeneration and that the levels of sAPPalpha are significantly reduced, these findings suggest the combined use of sAPPalpha and MAPCs offers a new and potentially powerful therapeutic strategy for AD treatment.
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Affiliation(s)
- Chun-Wei David Chen
- Molecular Neuropathology Laboratory, Mailman Research Center, McLean Hospital, 115 Mill Street, Belmont, MA 02478, USA
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Wu YW, Lai WFT, Tsai YH. Characterization of purified rat testicular transglutaminase and age-dependent changes of the enzyme activities. Int J Biochem Cell Biol 2005; 37:386-96. [PMID: 15474983 DOI: 10.1016/j.biocel.2004.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2004] [Revised: 06/26/2004] [Accepted: 07/13/2004] [Indexed: 11/23/2022]
Abstract
The Ca2+-dependent tissue transglutaminase is widely distributed in various tissues and has been reported to participate in many cellular growth and differentiation processes. In the past decade, tissue transglutaminase is also identified as a G protein, G(alphah), for intercellular signaling. To further characterize testicular transglutaminase, the rat testicular transglutaminase was purified by ammonium sulfate precipitation, DEAE ion-exchange, heparin-agarose, and GTP-agarose affinity chromatographies. This purification protocol resulted in a 8400-fold enrichment of the enzyme with a reproducible 15% yield. The purified enzyme showed as a single band of 78kDa on SDS-polyacrylamide gel. Western blot analysis using anti-liver tissue transglutaminase monoclonal antibody also recognized the enzyme, indicating it is a t-TGase in nature. The Km values of purified testicular transglutaminase for putrescine and N,N-dimethylcasein were determined to be 35 and 17 microM, respectively. Its transglutaminase cross-linking activity was strongly inhibited by EGTA, GTP, polyamines, and cystamine, as well as moderately by ATP and NaCl. The enzyme exhibited a magnesium-dependent GTP-hydrolyzing capacity, but its GTP-binding activity did not require magnesium. Furthermore, the enzyme activity was found to be closely related with the first wave of spermatogenesis. Thus, testicular transglutaminase is speculated to participate in the event of spermatogenesis. In conclusion, the purified testicular transglutaminase displays property of either the tissue-type transglutaminase, or the GTP-binding and hydrolyzing characteristics. The activity of testicular transglutaminase is age-dependent, greatly stimulated during the first wave of spermatogenesis.
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Affiliation(s)
- Yu-Wei Wu
- Graduate Institute of Cell and Molecular Biology, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan
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Goldring MB, Suen LF, Yamin R, Lai WFT. Regulation of Collagen Gene Expression by Prostaglandins and Interleukin-1beta in Cultured Chondrocytes and Fibroblasts. Am J Ther 1996; 3:9-16. [PMID: 11856992 DOI: 10.1097/00045391-199601000-00003] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
To compare the modulatory effects of different prostaglandins on collagen gene expression in human chondrocytes, PGE(2), PGE(1), misoprostol (PGE(1) analog), and PGF(2alpha) (10, 50 and 100 ng ml(minus sign1)) were added to human chondrocytes with or without interleukin-1beta (IL-1beta) in the presence of indomethacin to inhibit endogenous prostaglandin synthesis and the effects evaluated on chondrocyte morphology, collagen synthesis, and procollagen mRNA levels. The effects of prostaglandins on the expression of collagen gene regulatory sequences were examined using transient transfection assays of reporter gene constructs in human chondrocytes and BALB/c3T3 fibroblasts, PGE(1), misoprostol, and PGF(2alpha), similar to PGE(2), inhibited type I collagen gene expression in fibroblasts and promoted type II collagen gene expression in chondrocytes. PGE(2), the major inflammatory prostaglandin produced by IL-1-activated chondrocytes and fibroblasts, and PGF(2alpha) were somewhat more potent than the anti-inflammatory prostaglandins PGE(1) and misoprostol in counteracting the IL-1-induced suppression of type II collagen gene expression by chondrocytes and stimulation of type I collagen gene expression by fibroblasts. Rather than promoting degradation of the cartilage matrix in joint diseases, prostaglandins may be somewhat protective, suppressing fibrosis, and maintaining or promoting appropriate cartilage repair.
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Affiliation(s)
- Mary B. Goldring
- Massachusetts General Hospital, Charlestown, and Harvard Medical School, Boston, USA
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