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Du Q, Cui T, Niu G, Qui J, Yang B. Improving Bond Strength of Translucent Zirconia Through Surface Treatment With SiO2-ZrO2 Coatings. Oper Dent 2023; 48:666-676. [PMID: 37961015 DOI: 10.2341/22-121-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/13/2023] [Indexed: 11/15/2023]
Abstract
BACKGROUND Translucent monolithic zirconia ceramics have been applied in dental clinics due to their esthetic translucent formulations and mechanical properties. Considering inherent ceramic brittleness, adhesive bonding with resin composite increases the fracture resistance of ceramic restorations. However, zirconia is a chemically stable material that is difficult to adhesively bond with resin. OBJECTIVES To investigate the influences of SiO2-ZrO2 coatings on adhesive bonding of zirconia and the surface characterization of those coatings. METHODS AND MATERIALS Translucent zirconia discs were classified into groups based on surface treatments: CT (control), SB (sandblasting), C21(SiO2:ZrO2=2:1), C11(SiO2:ZrO2=1:1), and C12 (SiO2:ZrO2=1:2) (n=10). Surface characterization of coatings on zirconia were analyzed by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), surface roughness assessment (Ra), X-ray diffraction (XRD), water contact angle (WCA), translucency parameter (TP), and shear bond strength (SBS). Two-way ANOVA for shear bond strength results and ANOVA for Ra and WCA were performed. RESULTS SEM images revealed SiO2 islands on zirconia disks coated with SiO2-ZrO2. Surface roughness of C12, C11, and C21 groups was significantly larger than those of groups SB and CT (p<0.05). XRD results showed that phase transformation of zirconia disks was detected only in the SB group. In addition, SiO2-ZrO2 coatings reduced WCA. The translucency decreased only in group C21. Group C11 showed the highest shear bond strength under both aging conditions. CONCLUSION SiO2-ZrO2 coating is a promising method to enhance the adhesive resin bonding of translucent zirconia without causing phase transformation of translucent zirconia.
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Affiliation(s)
- Q Du
- †Qiao Du, DDS, Department of Stomatology, Beijing Integrated Traditional Chinese and Western Medicine Hospital, Beijing, China
| | - T Cui
- †Tiehan Cui, DDS, Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - G Niu
- *Guangliang Niu, DDS, Department of Stomatology,Beijing Integrated Traditional Chinese and Western Medicine Hospital, Beijing, China
| | - J Qui
- *Jiaxuan Qui, DDS, Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - B Yang
- *Bin Yang, DDS, Restorative Department, College of Dentistry, University of Illinois at Chicago, IL, USA
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Zhao T, Wu S, Li G, Chen Y, Niu G, Sugiyama M. Learning Intention-Aware Policies in Deep Reinforcement Learning. Neural Comput 2023; 35:1657-1677. [PMID: 37523456 DOI: 10.1162/neco_a_01607] [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] [Received: 02/12/2022] [Accepted: 05/22/2023] [Indexed: 08/02/2023]
Abstract
Deep reinforcement learning (DRL) provides an agent with an optimal policy so as to maximize the cumulative rewards. The policy defined in DRL mainly depends on the state, historical memory, and policy model parameters. However, we humans usually take actions according to our own intentions, such as moving fast or slow, besides the elements included in the traditional policy models. In order to make the action-choosing mechanism more similar to humans and make the agent to select actions that incorporate intentions, we propose an intention-aware policy learning method in this letter To formalize this process, we first define an intention-aware policy by incorporating the intention information into the policy model, which is learned by maximizing the cumulative rewards with the mutual information (MI) between the intention and the action. Then we derive an approximation of the MI objective that can be optimized efficiently. Finally, we demonstrate the effectiveness of the intention-aware policy in the classical MuJoCo control task and the multigoal continuous chain walking task.
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Affiliation(s)
- T Zhao
- College of Artificial Intelligence, Tianjin University of Science and Technology, Tianjin 300457, P.R.C.
| | - S Wu
- College of Artificial Intelligence, Tianjin University of Science and Technology, Tianjin 300457, P.R.C.
| | - G Li
- College of Artificial Intelligence, Tianjin University of Science and Technology, Tianjin 300457, P.R.C.
| | - Y Chen
- College of Artificial Intelligence, Tianjin University of Science and Technology, Tianjin 300457, P.R.C.
| | - G Niu
- RIKEN Center for Advanced Intelligence Project, Tokyo 103-0027, Japan
| | - Masashi Sugiyama
- RIKEN Center for Advanced Intelligence Project, Tokyo 103-0027, Japan
- Graduate School of Frontier Sciences, University of Tokyo, Tokyo 277-8561, Japan
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3
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Zhang Y, Liu J, Niu G, Wu Q, Cao B. Chi-miR-3880 mediates the regulatory role of interferon gamma in goat mammary gland. Dev Biol 2023; 501:104-110. [PMID: 37182733 DOI: 10.1016/j.ydbio.2023.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 04/02/2023] [Accepted: 04/18/2023] [Indexed: 05/16/2023]
Abstract
A healthy mammary gland is a necessity for milk production of dairy goats. The role of chi-miR-3880 in goat lactation is illustrated in our previous study. Among the differentially expressed genes regulated by chi-miR-3880, one seventh were interferon stimulated genes, including MX1, MX2, IFIT3, IFI44L, and DDX58. As the inflammatory cytokine interferon gamma (IFNγ) has been identified as a potential marker of caseous lymphadenitis in lactating sheep, the interaction between IFNγ and immune-related microRNAs was explored in this study. Chi-miR-3880 was found to be one of the microRNAs downregulated by IFNγ in goat mammary epithelial cells (GMECs). The study illustrated that IFNγ/chi-miR-3880/DDX58 axis modulates GMEC proliferation and lipid formation through PI3K/AKT/mTOR pathway, and regulates apoptosis through Caspase-3 and Bcl-2/Bax pathways. The role of the axis in mammary involution was reflected by the expression of p53 and NF-κB. In conclusion, IFNγ/chi-miR-3880/DDX58 axis plays an important part in lactation.
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Affiliation(s)
- Yue Zhang
- College of Animal Science and Technology, Northwest A&F University, 712100, Yangling, Shaanxi, China; Department of Oncology Pathology, Karolinska Institutet, 17164, Stockholm, Sweden; School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Jidan Liu
- College of Animal Science and Technology, Northwest A&F University, 712100, Yangling, Shaanxi, China; Longmen Animal Disease Prevention and Control Center, 516800, Huizhou, Guangdong, China
| | - Guanglin Niu
- School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Qiong Wu
- College of Animal Science and Technology, Northwest A&F University, 712100, Yangling, Shaanxi, China; Medical College, Qinghai University, 810001, Xining, Qinghai, China
| | - Binyun Cao
- College of Animal Science and Technology, Northwest A&F University, 712100, Yangling, Shaanxi, China.
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Zhang L, Piipponen M, Liu Z, Li D, Bian X, Niu G, Geara J, Toma MA, Sommar P, Xu Landén N. Human skin specific long noncoding RNA HOXC13-AS regulates epidermal differentiation by interfering with Golgi-ER retrograde transport. Cell Death Differ 2023; 30:1334-1348. [PMID: 36869179 PMCID: PMC10154349 DOI: 10.1038/s41418-023-01142-z] [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] [Received: 07/12/2022] [Revised: 02/15/2023] [Accepted: 02/21/2023] [Indexed: 03/05/2023] Open
Abstract
After a skin injury, keratinocytes switch from a state of homeostasis to one of regeneration leading to the reconstruction of the epidermal barrier. The regulatory mechanism of gene expression underpinning this key switch during human skin wound healing is enigmatic. Long noncoding RNAs (lncRNAs) constitute a new horizon in the understanding of the regulatory programs encoded in the mammalian genome. By comparing the transcriptome of an acute human wound and skin from the same donor as well as keratinocytes isolated from these paired tissue samples, we generated a list of lncRNAs showing changed expression in keratinocytes during wound repair. Our study focused on HOXC13-AS, a recently evolved human lncRNA specifically expressed in epidermal keratinocytes, and we found that its expression was temporally downregulated during wound healing. In line with its enrichment in suprabasal keratinocytes, HOXC13-AS was found to be increasingly expressed during keratinocyte differentiation, but its expression was reduced by EGFR signaling. After HOXC13-AS knockdown or overexpression in human primary keratinocytes undergoing differentiation induced by cell suspension or calcium treatment and in organotypic epidermis, we found that HOXC13-AS promoted keratinocyte differentiation. Moreover, RNA pull-down assays followed by mass spectrometry and RNA immunoprecipitation analysis revealed that mechanistically HOXC13-AS sequestered the coat complex subunit alpha (COPA) protein and interfered with Golgi-to-endoplasmic reticulum (ER) molecular transport, resulting in ER stress and enhanced keratinocyte differentiation. In summary, we identified HOXC13-AS as a crucial regulator of human epidermal differentiation.
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Affiliation(s)
- Letian Zhang
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Minna Piipponen
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Zhuang Liu
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Dongqing Li
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden.,Key Laboratory of Basic and Translational Research on Immune-Mediated Skin Diseases, Chinese Academy of Medical Sciences, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China
| | - Xiaowei Bian
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Guanglin Niu
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Jennifer Geara
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Maria A Toma
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden
| | - Pehr Sommar
- Department of Plastic and Reconstructive Surgery, Karolinska University Hospital, Stockholm, Sweden
| | - Ning Xu Landén
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176, Stockholm, Sweden. .,Ming Wai Lau Centre for Reparative Medicine, Stockholm Node, Karolinska Institutet, 17176, Stockholm, Sweden.
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5
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Toma M, Niu G, Geara J, Landén N. 596 Elucidating the role of Circular RNA circGLIS3 in human skin wound healing. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.09.613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Zhang Y, Niu G, Kong S, Wei F, Wang H, Dong Y, Yu L, Guan Y, Wang H, Yu X, Yin Z, Yuan Z. Predictive Model for the Radiotherapy Induced Rib Fracture (RIRF) after Stereotactic Body Radiotherapy. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Niu G, Zhang Y, Gao M, Zhao J, Wang H, Chen J, Guo X, Yu L, Guan Y, Dong Y, Yu X, Yin Z, Yuan Z, Kong S. Dosimetric Analysis of Radiation-Induced Brachial Plexopathy after Stereotactic Body Radiotherapy: The Contouring of Brachial Plexus Matters. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
An increasing number of noncoding RNAs (ncRNAs) have been found to regulate gene expression and protein functions, playing important roles in diverse biological processes and diseases. Their crucial functions have been reported in almost every cell type and all stages of skin wound healing. Evidence of their pathogenetic roles in common wound complications, such as chronic nonhealing wounds and excessive scarring, is also accumulating. Given their unique expression and functional properties, ncRNAs are promising therapeutic and diagnostic entities. In this review, we discuss current knowledge about the functional roles of noncoding elements, such as microRNAs, long ncRNAs, and circular RNAs, in skin wound healing, focusing on in vivo evidence from studies of human wound samples and animal wound models. Finally, we provide a perspective on the outlook of ncRNA-based therapeutics in wound care.
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Affiliation(s)
- Dongqing Li
- Key Laboratory of Basic and Translational Research on Immune-Mediated Skin Diseases, Chinese Academy of Medical Sciences, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China
| | - Guanglin Niu
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176 Stockholm, Sweden
| | - Ning Xu Landén
- Dermatology and Venereology Division, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, 17176 Stockholm, Sweden
- Ming Wai Lau Centre for Reparative Medicine, Stockholm Node, Karolinska Institute, 17177 Stockholm, Sweden
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Wang X, Li F, Zhu H, Jiang Z, Niu G, Gao Q. A Hierarchical Bayesian Latent Class Model for the Diagnostic Performance of Mini-Mental State Examination and Montreal Cognitive Assessment in Screening Mild Cognitive Impairment Due to Alzheimer's Disease. J Prev Alzheimers Dis 2022; 9:589-600. [PMID: 36281663 DOI: 10.14283/jpad.2022.70] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
BACKGROUND The Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) are low costing and noninvasive neuropsychological tests in screening Mild Cognitive Impairment (MCI) due to Alzheimer's disease (AD). There is no consensus on which test performs better in detecting MCI due to AD based on the different imperfect reference standards. Therefore, we conducted a meta-analysis to assess the diagnostic performance of MMSE and MoCA for screening MCI due to AD in the absence of a gold standard. METHODS Six electronic databases were searched for relevant studies until April, 2022. A hierarchical Bayesian latent class model was used to estimate the pooled sensitivity and specificity of MoCA and MMSE in the absence of a gold standard. RESULTS 90 eligible studies covering 21273 individuals for MMSE, 26631 individuals for MoCA were included in this meta-analysis. The pooled sensitivity was 0.71(95%CI: 0.67-0.74) for MMSE and 0.85(95%CI: 0.83-0.88) for MoCA, while the pooled specificity was 0.71(95%CI: 0.68-0.74) for MMSE and 0.79(95%CI: 0.76-0.81) for MoCA. MoCA was useful to "rule in" and "rule out" the diagnosis of MCI due to AD with higher positive likelihood ratio (4.07; 95%CI: 3.60-4.62) and lower negative likelihood ratio (0.18; 95%CI: 0.16-0.22). Moreover, the diagnostic odds ratio of MoCA was 22.08(95%CI: 17.24-28.29), which showed significantly favorable diagnostic performance. CONCLUSIONS It suggests that MoCA has greater diagnostic performance than MMSE for differentiating MCI due to AD when the gold standard is absent. However, these results should be taken with caution given the heterogeneity observed.
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Affiliation(s)
- X Wang
- Qi Gao, PhD, Department of Epidemiology and Health Statistics, School of Public Health, Capital Medical University, No. 10, Xi Toutiao You Anmenwai, Beijing 100069, China. Tel.: +010 83911497; E-mail:
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10
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Flisikowski K, Perleberg C, Niu G, Winogrodzki T, Bak A, Liang W, Grodziecki A, Zhang Y, Pausch H, Flisikowska T, Klinger B, Perkowska A, Kind A, Switonski M, Janssen KP, Saur D, Schnieke A. Wild-type APC Influences the Severity of Familial Adenomatous Polyposis. Cell Mol Gastroenterol Hepatol 2021; 13:669-671.e3. [PMID: 34774804 PMCID: PMC8777002 DOI: 10.1016/j.jcmgh.2021.11.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 10/26/2021] [Accepted: 11/01/2021] [Indexed: 02/07/2023]
Affiliation(s)
- Krzysztof Flisikowski
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich, Germany
| | - Carolin Perleberg
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany; Center of Integrated Protein Science Munich, Division of Clinical Pharmacology, University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Guanglin Niu
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Thomas Winogrodzki
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Agnieszka Bak
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Wei Liang
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Alessandro Grodziecki
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Yue Zhang
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | | | - Tatiana Flisikowska
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Bernhard Klinger
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Anna Perkowska
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Poznan, Poland
| | - Alexander Kind
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich Germany
| | - Marek Switonski
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Poznan, Poland
| | - Klaus-Peter Janssen
- Department of Surgery, School of Medicine, Technical University of Munich, Munich, Germany
| | - Dieter Saur
- Translational Cancer Research and Institute for Experimental Cancer Therapy, School of Medicine, Technical University of Munich, Munich, Germany; Department of Internal Medicine II, School of Medicine, Technical University of Munich, Munich, Germany; Division of Translational Cancer Research, German Cancer Research Center (DKFZ) and German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Angelika Schnieke
- Livestock Biotechnology, School of Life Sciences, Technical University of Munich, Munich, Germany; ZIEL Institute for Food and Health, School of Life Sciences, Technical University of Munich, Munich, Germany
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11
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Zhang Y, Wu Q, Niu G, Liu J, Cao F, An X, Cao B. EGF-Induced miR-223 Modulates Goat Mammary Epithelial Cell Apoptosis and Inflammation via ISG15. Front Cell Dev Biol 2021; 9:660933. [PMID: 34277608 PMCID: PMC8277964 DOI: 10.3389/fcell.2021.660933] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 06/08/2021] [Indexed: 12/24/2022] Open
Abstract
The health of mammary gland is essential for lactation. Epidermal growth factor (EGF) is reported to play an important role in lactation initiation and miR-223 is a conserved microRNA in anti-inflammation. In this study, EGF was found to induce a higher expression of miR-223 in goat mammary epithelial cell (gMEC). The downstream genes of miR-223 were screened by RNA sequencing, including Interferon-stimulated gene product 15 (ISG15), a pivotal immune responder, which was detected to be downregulated by EGF and miR-223. Due to the correlation between inflammation and apoptosis, the gMEC apoptosis modulated by EGF, miR-223, and ISG15 was investigated, and the protein expressions of Bcl-2/Bax, Caspase 3 and p53 were examined to evaluate the apoptosis of gMEC. The protein expressions of p-STAT3/STAT3, PR, FOXC1, and HOXA10, which had been shown to be related to inflammation, were detected to assess the inflammation of gMEC. This study provided a regulation axis, EGF/miR-223/ISG15, and illustrated its regulation to gMEC apoptosis and inflammation.
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Affiliation(s)
- Yue Zhang
- College of Animal Science and Technology, Northwest A&F University, Xianyang, China.,TUM School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Qiong Wu
- College of Animal Science and Technology, Northwest A&F University, Xianyang, China.,Medical College, Qinghai University, Xining, China
| | - Guanglin Niu
- TUM School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Jidan Liu
- College of Animal Science and Technology, Northwest A&F University, Xianyang, China
| | - Fangjun Cao
- College of Animal Science and Technology, Northwest A&F University, Xianyang, China
| | - Xiaopeng An
- College of Animal Science and Technology, Northwest A&F University, Xianyang, China
| | - Binyun Cao
- College of Animal Science and Technology, Northwest A&F University, Xianyang, China
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12
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Zhang Y, Niu G, Flisikowska T, Schnieke A, Flisikowski K. A tissue- and gender-specific regulation of the SARS-CoV-2 receptor ACE2 by p53 in pigs. Biochem Biophys Res Commun 2021; 553:25-29. [PMID: 33756342 PMCID: PMC7969875 DOI: 10.1016/j.bbrc.2021.03.068] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 03/12/2021] [Indexed: 01/08/2023]
Abstract
The current COVID-19 pandemic is caused by infections with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A sex-bias has been observed, with increased susceptibility and mortality in male compared to female patients. The gene for the SARS-CoV-2 receptor ACE2 is located on the X chromosome. We previously generated TP53 mutant pigs that exhibit a sex-specific patho-phenotype due to altered regulation of numerous X chromosome genes. In this study, we explored the effect of p53 deficiency on ACE2 expression in pigs. First, we identified the p53 binding site in the ACE2 promoter and could show its regulatory effect on ACE2 expression by luciferase assay in porcine primary kidney fibroblast cells. Later, quantitative PCR and western blot showed tissue- and gender-specific expression changes of ACE2 and its truncated isoform in p53-deficient pigs. We believe these findings will broaden the knowledge on ACE2 regulation and COVID-19 susceptibility.
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Affiliation(s)
- Yue Zhang
- Livestock Biotechnology, School of Life Science, Technische Universität München, Germany.
| | - Guanglin Niu
- Livestock Biotechnology, School of Life Science, Technische Universität München, Germany.
| | - Tatiana Flisikowska
- Livestock Biotechnology, School of Life Science, Technische Universität München, Germany.
| | - Angelika Schnieke
- Livestock Biotechnology, School of Life Science, Technische Universität München, Germany.
| | - Krzysztof Flisikowski
- Livestock Biotechnology, School of Life Science, Technische Universität München, Germany.
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Yao H, Lu W, Niu G, Zhang Q, Jiang Q, Liu H, Ni T. Characterizing the air pollution of the cities in the closure of corona virus disease 2019 in China. Int J Environ Sci Technol (Tehran) 2021; 18:2053-2062. [PMID: 33868434 PMCID: PMC8042843 DOI: 10.1007/s13762-021-03311-4] [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] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 02/08/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
With the rapid development of industrialization and urbanization in China, energy and vehicle consumption have continued to increase in recent years and air pollution has become serious. In early 2020, Corona Virus Disease 2019 broke out in Wuhan, China. From January 29, 2020, several sources of the air pollution almost all stopped working, including gasoline burning vehicles, dust producing building sites, coal-fired factories, etc. Five indicators of the atmospheric environmental quality were observed from December 19, 2019 to April 30, 2020 in nine cities and 1-h average concentrations, 24-h average concentrations and Air Quality Index were assessed. The 1-h average concentrations of the nitrogen dioxide, the ozone and the sulfur dioxide showed obvious difference though the closure did not change the sequence of the five pollutants' concentrations in the air at diverse sampling moments. The changing of the 24-h average concentrations of the five pollutants indicated the amount of pollutants in the air were greatly affected by human activities. The nitrogen dioxide, the sulfur dioxide and the particulate matters decreased obviously in the closure. The air in the metropolis and the south-east cities were relatively clean and the pollutants' concentrations decreased slightly during the closure period. The northern and the heavy industrial cities showed significant drop on air pollution indicators and the air quality of the two city groups could be greatly improved if some effective measures could be taken of environmental management and regional development.
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Affiliation(s)
- H. Yao
- School of Geography, Nantong University, Nantong, 226019 China
- Jiangsu Yangtze River Economic Belt Research Institute, Nantong, 226019 China
| | - W. Lu
- School of Geography, Nantong University, Nantong, 226019 China
- Jiangsu Yangtze River Economic Belt Research Institute, Nantong, 226019 China
| | - G. Niu
- School of Geography, Nantong University, Nantong, 226019 China
- Jiangsu Yangtze River Economic Belt Research Institute, Nantong, 226019 China
| | - Q. Zhang
- School of Geography, Nantong University, Nantong, 226019 China
- Jiangsu Yangtze River Economic Belt Research Institute, Nantong, 226019 China
| | - Q. Jiang
- School of Geography, Nantong University, Nantong, 226019 China
- Jiangsu Yangtze River Economic Belt Research Institute, Nantong, 226019 China
| | - H. Liu
- School of Geography, Nantong University, Nantong, 226019 China
- Jiangsu Yangtze River Economic Belt Research Institute, Nantong, 226019 China
| | - T. Ni
- School of Geographic and Oceanographic Science, Nanjing University, Nanjing, 210023 China
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14
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Niu G, Bak A, Nusselt M, Zhang Y, Pausch H, Flisikowska T, Schnieke AE, Flisikowski K. Allelic Expression Imbalance Analysis Identified YAP1 Amplification in p53- Dependent Osteosarcoma. Cancers (Basel) 2021; 13:cancers13061364. [PMID: 33803512 PMCID: PMC8002920 DOI: 10.3390/cancers13061364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 12/12/2022] Open
Abstract
Simple Summary Osteosarcoma (OS) is a highly heterogenous cancer, making the identification of genetic driving factors difficult. Genetic factors, such as heritable mutations of Rb1 and TP53, are associated with an increased risk of OS. We previously generated pigs carrying a mutated TP53 gene, which develop OS at high frequency. RNA sequencing and allelic expression imbalance analysis identified an amplification of YAP1 involved in p53- dependent OS progression. The inactivation of YAP1 inhibits proliferation, migration, and invasion, and leads to the silencing of TP63 and reconstruction of p16 expression in p53-deficient porcine OS cells. This study confirms the importance of p53/YAP1 network in cancer. Abstract Osteosarcoma (OS) is a primary bone malignancy that mainly occurs during adolescent growth, suggesting that bone growth plays an important role in the aetiology of the disease. Genetic factors, such as heritable mutations of Rb1 and TP53, are associated with an increased risk of OS. Identifying driver mutations for OS has been challenging due to the complexity of bone growth-related pathways and the extensive intra-tumoral heterogeneity of this cancer. We previously generated pigs carrying a mutated TP53 gene, which develop OS at high frequency. RNA sequencing and allele expression imbalance (AEI) analysis of OS and matched healthy control samples revealed a highly significant AEI (p = 2.14 × 10−39) for SNPs in the BIRC3-YAP1 locus on pig chromosome 9. Analysis of copy number variation showed that YAP1 amplification is associated with the AEI and the progression of OS. Accordingly, the inactivation of YAP1 inhibits proliferation, migration, and invasion, and leads to the silencing of TP63 and reconstruction of p16 expression in p53-deficient porcine OS cells. Increased p16 mRNA expression correlated with lower methylation of its promoter. Altogether, our study provides molecular evidence for the role of YAP1 amplification in the progression of p53-dependent OS.
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Affiliation(s)
- Guanglin Niu
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
| | - Agnieszka Bak
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
| | - Melanie Nusselt
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
| | - Yue Zhang
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
| | - Hubert Pausch
- Institute of Agricultural Sciences, ETH Zurich, 8092 Zurich, Switzerland;
| | - Tatiana Flisikowska
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
| | - Angelika E. Schnieke
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
| | - Krzysztof Flisikowski
- Chair of Livestock Biotechnology, Technical University of Munich, 85354 Freising, Germany; (G.N.); (A.B.); (M.N.); (Y.Z.); (T.F.); (A.E.S.)
- Correspondence:
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15
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Zhang Y, Liu J, Li W, Cao F, Niu G, Ji S, Du X, Cao B, An X. A Regulatory Circuit Orchestrated by Novel-miR-3880 Modulates Mammary Gland Development. Front Cell Dev Biol 2020; 8:383. [PMID: 32656203 PMCID: PMC7325939 DOI: 10.3389/fcell.2020.00383] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 04/28/2020] [Indexed: 01/22/2023] Open
Abstract
Milk casein and triglyceride content are important production traits in goats. Studies on mechanisms in milk casein secretion and mammary gland development is essential for milk goat breeding. miRNAs play an important role in goat lactation. While novel-miR-3880 is highly expressed at goat peak lactation stage, its molecular mechanism has not been studied. The purpose of the present study was to explore the relationship between novel-miR-3880 and lactation, as well as to construct a network among novel-miR-3880, ciRNA13761, and E74 like ETS transcription factor 2 (ELF2), thus further exploring their potential roles in milk components and mammary gland development. ELF2 was previously proven to be important in cell survival and proliferation, and 3′-UTR of ELF2 was predicted to have binding sites of novel-miR-3880. Our study found that the overexpression of novel-miR-3880 exerted anti-apoptotic and proliferative roles in GMEC, induced a boost in triglyceride synthesis, and caused a decrease in α s1-, α s2-, and β-casein, but an increase in κ-casein secretion. Furthermore, treatment in mice indicated that novel-miR-3880 could promote mammary gland development and extend the lactation period, while novel-miR-3880 expression was found to be suppressed by ciRNA13761 as a miRNA sponge. The present study explores a mechanism of triglyceride synthesis and casein secretion, and reveals a crosstalk between ciRNA13761/novel-miR-3880/ELF2 axis and PI3K/AKT/mTOR/S6K1 pathway, to gain a better understanding of lactation traits in dairy goats.
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Affiliation(s)
- Yue Zhang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jidan Liu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Wenfei Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Fangjun Cao
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Guanglin Niu
- School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Shengyue Ji
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Xiaoyan Du
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Binyun Cao
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Xiaopeng An
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
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16
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Hiltpold M, Niu G, Kadri NK, Crysnanto D, Fang ZH, Spengeler M, Schmitz-Hsu F, Fuerst C, Schwarzenbacher H, Seefried FR, Seehusen F, Witschi U, Schnieke A, Fries R, Bollwein H, Flisikowski K, Pausch H. Activation of cryptic splicing in bovine WDR19 is associated with reduced semen quality and male fertility. PLoS Genet 2020; 16:e1008804. [PMID: 32407316 PMCID: PMC7252675 DOI: 10.1371/journal.pgen.1008804] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [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: 01/25/2020] [Revised: 05/27/2020] [Accepted: 04/28/2020] [Indexed: 12/30/2022] Open
Abstract
Cattle are ideally suited to investigate the genetics of male reproduction, because semen quality and fertility are recorded for all ejaculates of artificial insemination bulls. We analysed 26,090 ejaculates of 794 Brown Swiss bulls to assess ejaculate volume, sperm concentration, sperm motility, sperm head and tail anomalies and insemination success. The heritability of the six semen traits was between 0 and 0.26. Genome-wide association testing on 607,511 SNPs revealed a QTL on bovine chromosome 6 that was associated with sperm motility (P = 2.5 x 10−27), head (P = 2.0 x 10−44) and tail anomalies (P = 7.2 x 10−49) and insemination success (P = 9.9 x 10−13). The QTL harbors a recessive allele that compromises semen quality and male fertility. We replicated the effect of the QTL on fertility (P = 7.1 x 10−32) in an independent cohort of 2481 Brown Swiss bulls. The analysis of whole-genome sequencing data revealed that a synonymous variant (BTA6:58373887C>T, rs474302732) in WDR19 encoding WD repeat-containing protein 19 was in linkage disequilibrium with the fertility-associated haplotype. WD repeat-containing protein 19 is a constituent of the intraflagellar transport complex that is essential for the physiological function of motile cilia and flagella. Bioinformatic and transcription analyses revealed that the BTA6:58373887 T-allele activates a cryptic exonic splice site that eliminates three evolutionarily conserved amino acids from WDR19. Western blot analysis demonstrated that the BTA6:58373887 T-allele decreases protein expression. We make the remarkable observation that, in spite of negative effects on semen quality and bull fertility, the BTA6:58373887 T-allele has a frequency of 24% in the Brown Swiss population. Our findings are the first to uncover a variant that is associated with quantitative variation in semen quality and male fertility in cattle. In cattle farming, artificial insemination is the most common method of breeding. To ensure high fertilization rates, ejaculate quality and insemination success are closely monitored in artificial insemination bulls. We analyse semen quality, insemination success and microarray-called genotypes at more than 600,000 genome-wide SNP markers of 794 bulls to identify a recessive allele that compromises semen quality. We take advantage of whole-genome sequencing to pinpoint a variant in the coding sequence of WDR19 encoding WD repeat-containing protein 19 that activates a novel exonic splice site. Our results indicate that cryptic splicing in WDR19 is associated with reduced male reproductive performance. This is the first report of a variant that contributes to quantitative variation in bovine semen quality.
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Affiliation(s)
| | - Guanglin Niu
- Livestock Biotechnology, TU München, Freising, Germany
| | | | | | - Zih-Hua Fang
- Animal Genomics, ETH Zürich, Lindau, Switzerland
| | | | | | | | | | | | - Frauke Seehusen
- Institute of Veterinary Pathology, University of Zurich, Zurich, Switzerland
| | | | | | - Ruedi Fries
- Animal Breeding, TU München, Freising, Germany
| | - Heinrich Bollwein
- Clinic of Reproductive Medicine, University of Zurich, Zürich, Switzerland
| | | | - Hubert Pausch
- Animal Genomics, ETH Zürich, Lindau, Switzerland
- * E-mail:
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17
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Wu Y, Chen J, Xie F, Liu H, Niu G, Lin L. Simulation of postoperative occlusion and direction in autotransplantation of teeth: application of computer-aided design and digital surgical templates. Br J Oral Maxillofac Surg 2019; 57:638-643. [DOI: 10.1016/j.bjoms.2019.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 05/15/2019] [Indexed: 11/15/2022]
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18
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19
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Zheng Y, Niu G, Zhang H, Lu W, Liu Z. Estrogen replacement therapy is not a recommended therapy for postmenopausal women with coronary heart disease: a meta-analysis. CLIN EXP OBSTET GYN 2019. [DOI: 10.12891/ceog4485.2019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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20
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Iemmo L, Di Bartolomeo A, Giubileo F, Luongo G, Passacantando M, Niu G, Hatami F, Skibitzki O, Schroeder T. Graphene enhanced field emission from InP nanocrystals. Nanotechnology 2017; 28:495705. [PMID: 29083313 DOI: 10.1088/1361-6528/aa96e6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report the observation of field emission (FE) from InP nanocrystals (NCs) epitaxially grown on an array of p-Si nanotips. We prove that FE can be enhanced by covering the InP NCs with graphene. The measurements are performed inside a scanning electron microscope chamber with a nano-controlled W-thread used as an anode. We analyze the FE by Fowler-Nordheim theory and find that the field enhancement factor increases monotonically with the spacing between the anode and the cathode. We also show that InP/p-Si junction has a rectifying behavior, while graphene on InP creates an ohmic contact. Understanding the fundamentals of such nanojunctions is key for applications in nanoelectronics.
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Affiliation(s)
- L Iemmo
- Physics Department 'E. R. Caianiello', University of Salerno, via Giovanni Paolo II, I-84084, Fisciano, Italy
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21
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Liang G, Yang Y, Niu G, Tang Z, Li K. Genome-wide profiling of Sus scrofa circular RNAs across nine organs and three developmental stages. DNA Res 2017; 24:523-535. [PMID: 28575165 PMCID: PMC5737845 DOI: 10.1093/dnares/dsx022] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 05/03/2017] [Indexed: 01/15/2023] Open
Abstract
The spatio-temporal expression patterns of Circular RNA (circRNA) across organs and developmental stages are critical for its function and evolution analysis. However, they remain largely unclear in mammals. Here, we comprehensively analysed circRNAs in nine organs and three skeletal muscles of Guizhou miniature pig (S. scrofa), a widely used biomedical model animal. We identified 5,934 circRNAs and analysed their molecular properties, sequence conservation, spatio-temporal expression pattern, potential function, and interaction with miRNAs. S. scrofa circRNAs show modest sequence conservation with human and mouse circRNAs, are flanked by long introns, exhibit low abundance, and are expressed dynamically in a spatio-temporally specific manner. S. scrofa circRNAs show the greatest abundance and complexity in the testis. Notably, 31% of circRNAs harbour well-conserved canonical miRNA seed matches, suggesting that some circRNAs act as miRNAs sponges. We identified 149 circRNAs potentially associated with muscle growth and found that their host genes were significantly involved in muscle development, contraction, chromatin modification, cation homeostasis, and ATP hydrolysis-coupled proton transport; moreover, this set of genes was markedly enriched in genes involved in tight junctions and the calcium signalling pathway. Finally, we constructed the first public S. scrofa circRNA database, allowing researchers to query comprehensive annotation, expression, and regulatory networks of circRNAs.
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Affiliation(s)
- Guoming Liang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Department of Pig Genomic Design and Breeding, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China.,Shenzhen Key Laboratory of Phenotype Analysis and Utilization of Agricultural Genome, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China
| | - Yalan Yang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Department of Pig Genomic Design and Breeding, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China.,Shenzhen Key Laboratory of Phenotype Analysis and Utilization of Agricultural Genome, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China
| | - Guanglin Niu
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Zhonglin Tang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Department of Pig Genomic Design and Breeding, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China.,Shenzhen Key Laboratory of Phenotype Analysis and Utilization of Agricultural Genome, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China
| | - Kui Li
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Department of Pig Genomic Design and Breeding, Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China
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22
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Hu Q, Niu G. Attitude output feedback control for rigid spacecraft with finite-time convergence. ISA Trans 2017; 70:173-186. [PMID: 28789773 DOI: 10.1016/j.isatra.2017.07.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/12/2017] [Accepted: 07/21/2017] [Indexed: 06/07/2023]
Abstract
The main problem addressed is the quaternion-based attitude stabilization control of rigid spacecraft without angular velocity measurements in the presence of external disturbances and reaction wheel friction as well. As a stepping stone, an angular velocity observer is proposed for the attitude control of a rigid body in the absence of angular velocity measurements. The observer design ensures finite-time convergence of angular velocity state estimation errors irrespective of the control torque or the initial attitude state of the spacecraft. Then, a novel finite-time control law is employed as the controller in which the estimate of the angular velocity is used directly. It is then shown that the observer and the controlled system form a cascaded structure, which allows the application of the finite-time stability theory of cascaded systems to prove the finite-time stability of the closed-loop system. A rigorous analysis of the proposed formulation is provided and numerical simulation studies are presented to help illustrate the effectiveness of the angular-velocity observer for rigid spacecraft attitude control.
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Affiliation(s)
- Qinglei Hu
- School of Automation Science and Electrical Engineering, Beihang University, XueYuan Road No.37, HaiDian District, Beijing 100191, China.
| | - Guanglin Niu
- School of Automation Science and Electrical Engineering, Beihang University, XueYuan Road No.37, HaiDian District, Beijing 100191, China
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23
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Niu G, Feng T, Jiang C, Suo N, Lin J, Qu F, Mcspadden L, Yao Y, Zhang S. P387Electrogram-derived quantitative criteria improves predictive values for locating the site of focal idiopathic outflow tract ventricular arrhythmias. Europace 2017. [DOI: 10.1093/ehjci/eux141.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Niu G, Schubert MA, Sharath SU, Zaumseil P, Vogel S, Wenger C, Hildebrandt E, Bhupathi S, Perez E, Alff L, Lehmann M, Schroeder T, Niermann T. Electron holography on HfO 2/HfO 2-x bilayer structures with multilevel resistive switching properties. Nanotechnology 2017; 28:215702. [PMID: 28462907 DOI: 10.1088/1361-6528/aa6cd9] [Citation(s) in RCA: 7] [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] [Indexed: 06/07/2023]
Abstract
Unveiling the physical nature of the oxygen-deficient conductive filaments (CFs) that are responsible for the resistive switching of the HfO2-based resistive random access memory (RRAM) devices represents a challenging task due to the oxygen vacancy related defect nature and nanometer size of the CFs. As a first important step to this goal, we demonstrate in this work direct visualization and a study of physico-chemical properties of oxygen-deficient amorphous HfO2-x by carrying out transmission electron microscopy electron holography as well as energy dispersive x-ray spectroscopy on HfO2/HfO2-x bilayer heterostructures, which are realized by reactive molecular beam epitaxy. Furthermore, compared to single layer devices, Pt/HfO2/HfO2-x /TiN bilayer devices show enhanced resistive switching characteristics with multilevel behavior, indicating their potential as electronic synapses in future neuromorphic computing applications.
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Affiliation(s)
- G Niu
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. IHP, Im Technologiepark 25, D-15236 Frankfurt (Oder), Germany
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25
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Niu G, Yang Y, Zhang Y, Hua C, Wang Z, Tang Z, Li K. Identifying suitable reference genes for gene expression analysis in developing skeletal muscle in pigs. PeerJ 2016; 4:e2428. [PMID: 27994956 PMCID: PMC5157201 DOI: 10.7717/peerj.2428] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 08/11/2016] [Indexed: 11/20/2022] Open
Abstract
The selection of suitable reference genes is crucial to accurately evaluate and normalize the relative expression level of target genes for gene function analysis. However, commonly used reference genes have variable expression levels in developing skeletal muscle. There are few reports that systematically evaluate the expression stability of reference genes across prenatal and postnatal developing skeletal muscle in mammals. Here, we used quantitative PCR to examine the expression levels of 15 candidate reference genes (ACTB, GAPDH, RNF7, RHOA, RPS18, RPL32, PPIA, H3F3, API5, B2M, AP1S1, DRAP1, TBP, WSB, and VAPB) in porcine skeletal muscle at 26 different developmental stages (15 prenatal and 11 postnatal periods). We evaluated gene expression stability using the computer algorithms geNorm, NormFinder, and BestKeeper. Our results indicated that GAPDH and ACTB had the greatest variability among the candidate genes across prenatal and postnatal stages of skeletal muscle development. RPS18, API5, and VAPB had stable expression levels in prenatal stages, whereas API5, RPS18, RPL32, and H3F3 had stable expression levels in postnatal stages. API5 and H3F3 expression levels had the greatest stability in all tested prenatal and postnatal stages, and were the most appropriate reference genes for gene expression normalization in developing skeletal muscle. Our data provide valuable information for gene expression analysis during different stages of skeletal muscle development in mammals. This information can provide a valuable guide for the analysis of human diseases.
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Affiliation(s)
- Guanglin Niu
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Yalan Yang
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - YuanYuan Zhang
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Chaoju Hua
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zishuai Wang
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zhonglin Tang
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Kui Li
- The Key Laboratory for Domestic Animal Genetic Resources and Breeding of Ministry of Agriculture of China, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
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26
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Jiang M, Yun Q, Niu G, Gao Y, Shi F, Yu S. Puerarin prevents inflammation and apoptosis in the neurocytes of a murine Parkinson's disease model. Genet Mol Res 2016; 15:gmr7501. [PMID: 27808353 DOI: 10.4238/gmr.15047501] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The aim of this study was to investigate Parkinson's disease (PD) using a murine model of PD. Specifically, we aimed to explore the mechanism by which puerarin prevents inflammation and apoptosis in neurocytes. Eighty healthy male C57/BL6 mice were randomly selected and divided into four groups (N = 20 each): control group; PD group; PD+puerarin group; and puerarin group. At the end of the treatment period, the animals' brains were removed after perfusion and decollation. The protein expression levels of tyrosine hydroxylase (TH) in the murine brains were assessed by immunohistochemistry and the protein expression levels of TH, glial fibrillary acidic protein (GFAP), inducible nitric oxide synthase (iNOS), cleaved Caspase-3, and Bax in the substantia nigra and corpus striatum of the animals were assessed by western blotting. The spontaneous activity of the PD mice was found to be significantly higher after puerarin treatment and the distance traveled by mice in an open field assessment was 1700 cm further in puerarin-treated PD mice than in PD mice. Immunohistochemistry and western blotting analyses indicated that the expression of TH was significantly higher (2.63-fold) in puerarin-treated PD mice than in untreated PD mice and that the expression of GFAP in PD mice was significantly reduced (~45%) by puerarin treatment. These findings lead us to conclude that puerarin significantly alleviates 1-methyl-4-phenyl- 1,2,3,6-tetrahydropyridine-induced injury in dopaminergic neurons. Puerarin mediates anti-apoptotic and anti-inflammatory activities and plays a neuroprotective role.
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Affiliation(s)
- M Jiang
- Department of Neurology, General PLA Hospital, Beijing, China.,Department of Neurology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Q Yun
- Department of Neurology, the People's Hospital, Hohhot, Inner Mongolia, China
| | - G Niu
- Department of Neurology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Y Gao
- Department of Neurology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - F Shi
- Department of Neurology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - S Yu
- Department of Neurology, General PLA Hospital, Beijing, China
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27
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Affiliation(s)
- J. Chen
- Department of Gastrointestinal Surgery, Northern Jiangsu People’s Hospital, Yangzhou, Jiangsu Province, China
| | - D.-R. Wang
- Department of Gastrointestinal Surgery, Northern Jiangsu People’s Hospital, Yangzhou, Jiangsu Province, China
| | - J.-R. Zhang
- Department of Gastrointestinal Surgery, Northern Jiangsu People’s Hospital, Yangzhou, Jiangsu Province, China
| | - P. Li
- Department of Gastrointestinal Surgery, Northern Jiangsu People’s Hospital, Yangzhou, Jiangsu Province, China
| | - G. Niu
- Department of Gastrointestinal Surgery, Northern Jiangsu People’s Hospital, Yangzhou, Jiangsu Province, China
| | - Q. Lu
- Department of Gastrointestinal Surgery, Northern Jiangsu People’s Hospital, Yangzhou, Jiangsu Province, China
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28
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Li S, Niu G, Wu Y, Du G, Huang C, Yin X, Liu Z, Song C, Leng H. Vitamin D prevents articular cartilage erosion by regulating collagen II turnover through TGF-β1 in ovariectomized rats. Osteoarthritis Cartilage 2016; 24:345-53. [PMID: 26343586 DOI: 10.1016/j.joca.2015.08.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 08/13/2015] [Accepted: 08/24/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To explore the effect of vitamin D on turnover of articular cartilage with ovariectomy (OVX) induced OA, and to investigate transforming growth factor-β1 (TGF-β1) as a possible underlying mechanism mediated by 1α,25(OH)2D3. DESIGN Sixty-six rats were randomly allocated into seven groups: sham plus control diet (SHAM+CTL), OVX+CTL diet, sham plus vitamin D-deficient (VDD) diet, OVX+VDD diet, and three groups of ovariectomized rats treated with different doses of 1α,25(OH)2D3. The cartilage erosion and the levels of serum 17β-estradiol, 1α,25(OH)2D3 and C-telopeptide of type II collagen (CTX-II) were measured. TGF-β1, type II Collagen (CII), matrix metalloproteinases (MMP)-9,-13 in articular cartilage were assessed by immunohistochemistry. TGF-β1 and CTX-II expression were measured in articular cartilage chondrocytes treated with/without tumor necrosis factor (TNF-α), 1α,25(OH)2D3, and TGF-β receptor inhibitor (SB505124) in vitro. RESULTS Cartilage erosion due to OVX was significantly reduced in a dose-dependent manner by 1α,25(OH)2D3 supplementation, and exacerbated by VDD. The expressions of TGF-β1 and CII in articular cartilage were suppressed by OVX and VDD, and rescued by 1α,25(OH)2D3 supplementation. The expression of MMP-9,-13 in articular cartilage increased with OVX and VDD, and decreased with 1α,25(OH)2D3 supplementation. In vitro experiments showed that 1α,25(OH)2D3 increased the TGF-β1 expression of TNF-α stimulated chondrocytes in a dose-dependent manner. 1α,25(OH)2D3 significantly counteracted the increased CTX-II release due to TNF-α stimulation, and this effect was significantly suppressed by SB505124. CONCLUSION VDD aggravated cartilage erosion, and 1α,25(OH)2D3 supplementation showed protective effects in OVX-induced OA partly through the TGF-β1 pathway.
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Affiliation(s)
- S Li
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China.
| | - G Niu
- Beijing Key Lab of Spine Diseases, Beijing 100191, China.
| | - Y Wu
- 2nd Dental Center, Peking University School and Hospital of Stomatology, Beijing 100101, China.
| | - G Du
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China.
| | - C Huang
- Medical Central Lab, Peking University Third Hospital, Beijing 100191, China.
| | - X Yin
- Beijing Key Lab of Spine Diseases, Beijing 100191, China.
| | - Z Liu
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China.
| | - C Song
- Beijing Key Lab of Spine Diseases, Beijing 100191, China.
| | - H Leng
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China.
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Wilkens H, Spieß W, Zoellner MH, Niu G, Schroeder T, Wollschläger J. Post deposition annealing of epitaxial Ce 1−xPr xO 2−δfilms grown on Si(111). Phys Chem Chem Phys 2015; 17:9991-6. [DOI: 10.1039/c5cp01105a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work the structural and morphological changes of Ce1−xPrxO2−δ(x= 0.20, 0.35 and 0.75) films grown on Si(111) due to post deposition annealing are investigated by low energy electron diffraction combined with a spot profile analysis.
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Affiliation(s)
- H. Wilkens
- Fachbereich Physik
- Universität Osnabrück
- D-49069 Osnabrück
- Germany
| | - W. Spieß
- Fachbereich Physik
- Universität Osnabrück
- D-49069 Osnabrück
- Germany
| | | | - G. Niu
- IHP
- D-15236 Frankfurt(Oder)
- Germany
| | - T. Schroeder
- IHP
- D-15236 Frankfurt(Oder)
- Germany
- BTU Cottbus
- Institute of Physics
| | - J. Wollschläger
- Fachbereich Physik
- Universität Osnabrück
- D-49069 Osnabrück
- Germany
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Wang J, Leroy J, Niu G, Saint-Girons G, Gautier B, Vilquin B, Barrett N. Chemistry and structure of BaTiO3 ultra-thin films grown by different O2 plasma power. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2013.12.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wilkens H, Schuckmann O, Oelke R, Gevers S, Reichling M, Schaefer A, Bäumer M, Zoellner MH, Niu G, Schroeder T, Wollschläger J. Structural transitions of epitaxial ceria films on Si(111). Phys Chem Chem Phys 2013; 15:18589-18599. [PMID: 24076746 DOI: 10.1063/1.4795867] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The structural changes of a (111) oriented CeO2 film grown on a Si(111) substrate covered with a hex-Pr2O3(0001) interface layer due to post deposition annealing are investigated. X-ray photoelectron spectroscopy measurements revealing the near surface stoichiometry show that the film reduces continuously upon extended heat treatment. The film is not homogeneously reduced since several coexisting crystalline ceria phases are stabilized due to subsequent annealing at different temperatures as revealed by high resolution low energy electron diffraction and X-ray diffraction. The electron diffraction measurements show that after annealing at 660 °C the ι-phase (Ce7O12) is formed at the surface which exhibits a (√7 × √7)R19.1° structure. Furthermore, a (√27 × √27)R30° surface structure with a stoichiometry close to Ce2O3 is stabilized after annealing at 860 °C which cannot be attributed to any bulk phase of ceria stable at room temperature. In addition, it is shown that the fully reduced ceria (Ce2O3) film exhibits a bixbyite structure. Polycrystalline silicate (CeSi(x)O(y)) and crystalline silicide (CeSi1.67) are formed at 850 °C and detected at the surface after annealing above 900 °C.
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Affiliation(s)
- H Wilkens
- Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49076 Osnabrück, Germany.
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Peng WW, Niu G, Tétot R, Vilquin B, Raimondi F, Brubach JB, Amzallag E, Yanagida T, Autier-Laurent S, Lecoeur P, Roy P. Insulator-metal transition of VO₂ ultrathin films on silicon: evidence for an electronic origin by infrared spectroscopy. J Phys Condens Matter 2013; 25:445402. [PMID: 24121423 DOI: 10.1088/0953-8984/25/44/445402] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report on the first simultaneous observations of both electronic and structural temperature-induced insulator-to-metal transition (IMT) in VO2 ultrathin films, made possible by the use of broad range transmission infrared spectroscopy. Thanks to these techniques, the infrared phonon structures, as well as the appearance of the free carrier signature, were resolved for the first time. The temperature-resolved spectra allowed the determination of the temperature hysteresis for both the structural (monoclinic-to-rutile) and electronic (insulator-to-metallic) transitions. The combination of these new observations and DFT simulations for the monoclinic structure allows us to verify the direct transition from monoclinic (M1) to rutile and exclude an intermediate structural monoclinic form (M2). The delay in structural modification compared to the primer electronic transition (325 K compared to 304 K) supports the role of free charges as the transition driving force. The shape of the free charge hysteresis suggests that the primer electronic transition occurs first at 304 K, followed by both its propagation to the heart of the layer and the structural transition when T increases. This study outlines further the potential of VO2 ultrathin films integrated on silicon for optoelectronics and microelectronics.
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Affiliation(s)
- W W Peng
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France
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Chen J, Wang DR, Zhang JR, Li P, Niu G, Lu Q. Meta-analysis of temporary ileostomy versus colostomy for colorectal anastomoses. Acta Chir Belg 2013; 113:330-339. [PMID: 24294797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
BACKGROUND/AIMS Defunctioning stoma is a common surgical procedure, it is now generally acknowledged that defunctioning stoma significantly reduce the rates of complications in colorectal surgery, but the choice of temporary ileostomy or temporary colostomy for defunctioning colorectal anastomoses remains controversial. This meta-analysis evaluated two types of defunctioning stoma to determine whether one is superior to the other. METHODOLOGY Studies and relevant literatures comparing temporary ileostomy with temporary colostomy for defunctioning colorectal anastomoses were searched though PubMed, Embase and The Cochrane Library. The rates of complications were pooled and compared using a meta-analysis. The risk ratios were calculated with 95% confidence intervals to evaluate the safety and efficacy of each technique. RESULTS Five randomized controlled trials and seven non-randomized studies were included, with 1687 patients in total. The meta-analysis of the RCTs demonstrated a lower risk of stoma prolapse (RR 0.15; 95% CI: 0.04-0.48, p = 0.001) in the temporary ileostomy group. Meta-analysis of the non-randomized studies showed a lower risk of stoma prolapse (RR 0.26; 95% CI 0.10-0.67, p = 0.005) and wound infection after stoma closure (RR 0.28; 95% CI 0.5-0.52, p < 0.0001) in the temporary ileostomy group. No other statistically significant difference was observed for complications. CONCLUSIONS Each type of defunctioning stoma has its advantages and disadvantages, and there is not a strong evidence for the superiority of one temporary stoma over another for colorectal anastomoses. According to this, large scale RCTs and high quality studies are needed to conduct.
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Affiliation(s)
- J Chen
- Department of Gastrointestinal Surgery, Northern Jiangsu People's Hospital, Yangzhou, Jiangsu Province, China
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Wilkens H, Schuckmann O, Oelke R, Gevers S, Reichling M, Schaefer A, Bäumer M, Zoellner MH, Niu G, Schroeder T, Wollschläger J. Structural transitions of epitaxial ceria films on Si(111). Phys Chem Chem Phys 2013; 15:18589-99. [DOI: 10.1039/c3cp52688g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang Y, Hong H, Yang Y, Severin G, Engle J, Niu G, Chen X, Leigh B, Barnhart T, Cai W. WE-C-217BCD-04: Multimodality Imaging of Breast Cancer Experimental Lung Metastasis. Med Phys 2012; 39:3950. [PMID: 28519986 DOI: 10.1118/1.4736120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Metastatic breast cancer (MBC) is incurable. The clinical gold standard for assessing tumor microvessel density (MVD), an independent prognostic marker in MBC, is CD 105 staining. The goal of this study is to develop a positron emission tomography (PET)/near-infrared fluorescent (NIRF) probe for imaging of CD105 expression in MBC (i.e. non-invasive measurement of MVD), as well as other applications such as early detection of metastasis, intraoperative guidance, etc. METHODS TRC105, a chimeric anti-CD105 mAb, was dual-labeled with a NIRF dye and 89 Zr to yield 8 9 Zr-Df-TRC105-800CW. Luciferase-transfected 4T1 murine breast cancer cells were injected intravenously into female BALB/c mice to establish a lung MBC model. Bio luminescence imaging (BLI) was carried out to non- invasively monitor the lung tumor burden. Comprehensive in vivo/ex vivo studies were performed to investigate 8 9 Zr-Df-TRC105-800CW in this MBC model. Cetuximab was used as an isotype-matched control. RESULTS Radiolabeled TRC105 has high tumor uptake in many tumor types in addition to MBC (e.g. pancreatic/prostate cancer and brain tumor), revealing broad clinical potential for TRC105-based agents. FACS analysis of HUVECs showed no difference in CD 105 binding between TRC105 and Df- TRC105-800CW. PET imaging revealed that 4T1 lung tumor uptake of 89 Zr-Df-TRC105-800CW was 8.7±1.4,10.9±0.5, and 9.7±1.1 %ID/g at 4, 24, and 48 h post-injection (n = 4), with excellent tumor contrast. Bio distribution studies, blocking, control studies with 8 9 Zr-Df-cetuximab- 800CW, ex vivo BLI/PET/NIRF imaging, and histology all confirmed CD 105 specificity of the tracer. NIRF imaging-guided removal of 4T1 tumors with Df-TRC105-800CW in a subcutaneous model was also straightforward. CONCLUSIONS We report the first PET/NIRF imaging of CD105 expression in a MBC model. Broad clinical potential of TRC105- based agents was shown in many tumor types, which also enabled early detection of small metastases and provided intraoperative guidance for tumor removal.
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Affiliation(s)
- Y Zhang
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - H Hong
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - Y Yang
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - G Severin
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - J Engle
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - G Niu
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - X Chen
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - B Leigh
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - T Barnhart
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
| | - W Cai
- University of Wisconsin - Madison, Madison, WI.,NIBIB, Bethesda, MD.,TRACON Pharmaceuticals, Inc., San Diego, CA
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Niu G, Yang J, Wang R, Dang S, Wu EX, Guo Y. MR imaging assessment of lumbar intervertebral disk degeneration and age-related changes: apparent diffusion coefficient versus T2 quantitation. AJNR Am J Neuroradiol 2011; 32:1617-23. [PMID: 21799044 DOI: 10.3174/ajnr.a2556] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE T2 and ADC mappings are 2 quantitative MR imaging tools for assessing IVDD. This study aimed to compare these 2 measures in detecting IVDD and its age-related changes. MATERIALS AND METHODS Thirty-seven asymptomatic volunteers and 28 patients with back pain or sciatica were examined, and their lumbar disk T2 and ADC maps were quantified via sagittal imaging protocols at 1.5T. For all participants, the Pfirrmann system was used by 2 radiologists for grading disks. T2 and ADC values in the inner portion of disks were measured, and their variances in different grades were analyzed by 1-way ANOVA testing. The ability of T2 and ADC measures to differentiate IVDD grades was compared on the basis of their ROC curves. For asymptomatic subjects, the correlations between age and the 2 MR imaging measures were assessed by the Pearson correlation test. RESULTS Both T2 and ADC values were found to decrease with the increasing Pfirrmann grades except T2 in grade V. Significant T2 differences were seen among grades I-IV, but not between grades IV and V. There were no significant ADC differences among grades I-III. Moreover, the areas under the ROC curves differed significantly (0.95 and 0.67 for T2 and ADC, respectively). Linear regression analysis revealed that T2 yielded more significant correlation with age (r = -0.77) than ADC did (r = -0.37). CONCLUSIONS T2 quantitation provides a more sensitive and robust approach for detecting and characterizing the early stage of IVDD and age-related disk changes.
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Affiliation(s)
- G Niu
- Department of Diagnostic Radiology, First Hospital of Medical School, Xi’an Jiaotong University, Xi’an, China
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37
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Barrett N, Rault J, Krug I, Vilquin B, Niu G, Gautier B, Albertini D, Lecoeur P, Renault O. Influence of the ferroelectric polarization on the electronic structure of BaTiO3
thin films. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3369] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Okinaga T, Xie Z, Niu G, Qi F, Merritt J. Examination of the hdrRM regulon yields insight into the competence system of Streptococcus mutans. Mol Oral Microbiol 2010; 25:165-77. [PMID: 20536745 DOI: 10.1111/j.2041-1014.2010.00574.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Previous studies have identified the hdrRM operon as a novel regulatory system induced by conditions of high cell density. Little is known about the genes under the control of this system, but a variety of important phenotypes are associated with either hdrR overexpression or mutation of hdrM. To characterize the regulatory function of the HdrRM system in Streptococcus mutans we used a microarray approach to compare the transcriptional profiles of an hdrR overexpression strain with an hdrM mutant. Both strains exhibited almost identical profiles, which included all of the known late competence genes as well as a variety of competence-induced bacteriocins. Through a combination of real-time reverse transcription-polymerase chain reaction (PCR), reporter gene analysis and random amplification of complementary DNA ends PCR, we confirmed the role of comX as a central intermediate regulator of numerous genes in the hdrRM regulon. Through these studies, we also identified novel comX-regulated genes required for natural competence. Taken together, our results suggest that the primary function of the HdrRM system is to regulate the late competence genes together with various bacteriocins. This occurs independently of the ComCDE system, even though both systems regulate nearly identical genes. This suggests that S. mutans has multiple parallel input sensory systems that control the same output response: the induction of natural competence and concurrent production of bacteriocins.
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Affiliation(s)
- T Okinaga
- Department of Oral Biology, College of Dentistry, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104-5419, USA
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Abstract
e15603 Background: The prognosis of pancreatic cancer remains dismal because of difficult early diagnosis, low resection rate and aggressive biological behavior. The research of factors related to oncogenesis, tumor infiltration and metastasis is valuable. AMPK(AMP-activated protein kinase)family is a group of regulators on the cellular energy metabolism which are sensitive to the cytoplasmic change of AMP/ATP ratio. As a member of AMPK, BRSK2 is found to be expressed in human pancreatic cell line and facilitate the tumor cell survival on glucose starving. In order to examine the expression of BRSK2 in human pancreatic cancer and explore the underline clinical implication, human pancreatic tissue was examined immunohistochemically Correlation of tumor biological behavior, prognosis and BRSK2 expression was examined. Methods: Seventy nine resected tumor specimens were collected. Immunochemical staining method was used to examine the expression pattern of BRSK2 translated protein. Semi-quantitative analysis was employed to compare the expression intensity and content of BRSK2 in tumor issues, peri-tumorous tissue and normal pancreatic tissue. Possible relationship of tumors differentiation, TNM stage, presence or absence of vessel and neural infiltration were explored with BRSK2 expression. The correlation of BRSK2 expression profile and patients survival was explored. Results: BRSK2 was weakly expressed in normal pancreatic tissues and peri-tumor tissues, including the islet and minor ducts. BRSK2 was strongly expressed in pancreatic cancer tissues, the expression intensity was correlated with extent of lymphatic metastasis, distant metastasis, TNM staging and neural invasion. Tumors with lymphatic metastasis, distant metastasis, neural invasion and later TNM stages showed stronger expression of BRSK2. The expression of BRSK2 in pancreatic cancer was closely correlated to the prognosis of patients, those with higher expression pattern showed bad prognosis. Conclusions: BRSK2 is up-regulated in pancreatic cancer; the expression of BRSK2 is correlated with tumor biological behavior and patient's prognosis. No significant financial relationships to disclose.
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Affiliation(s)
- W. Lou Dr.
- Zhong Shan Hospital, Fudan University, Shanghai, China; Zhong Shan Hospital, Shanghai, China
| | - G. Niu
- Zhong Shan Hospital, Fudan University, Shanghai, China; Zhong Shan Hospital, Shanghai, China
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Saborni M, Mahlendorf F, Teneva-Kosseva G, Niu G, Pohland vom Schloß H. Diesel-Reformer zur Wasserstofferzeugung für Brennstoffzellen. CHEM-ING-TECH 2008. [DOI: 10.1002/cite.200750770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mantell LL, Kazzaz JA, Xu J, Palaia TA, Piedboeuf B, Hall S, Rhodes GC, Niu G, Fein AF, Horowitz S. Unscheduled apoptosis during acute inflammatory lung injury. Cell Death Differ 2003; 4:600-7. [PMID: 14555973 DOI: 10.1038/sj.cdd.4400278] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/1999] [Revised: 05/08/1999] [Accepted: 05/30/1999] [Indexed: 11/08/2022] Open
Abstract
Apoptosis is a mode of cell death currently thought to occur in the absence of inflammation. In contrast, inflammation follows unscheduled events such as acute tissue injury which results in necrosis, not apoptosis. We examined the relevance of this paradigm in three distinct models of acute lung injury; hyperoxia, oleic acid, and bacterial pneumonia. In every case, it was found that apoptosis is actually a prominent component of the acute and inflammatory phase of injury. Moreover, using strains of mice that are differentially sensitive to hyperoxic lung injury we observed that the percent of apoptotic cells was well correlated with the severity of lung injury. These observations suggest that apoptosis may be one of the biological consequences during acute injury and the failure to remove these apoptotic cells may also contribute to the inflammatory response.
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Affiliation(s)
- L L Mantell
- The CardioPulmonary Research Institute, Department of Medicine (Pulmonary and Critical Care), Winthrop-University Hospital, State University of New York at Stony Brook School of Medicine, Mineola, NY 11501, USA
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Bao Y, Liang Y, Niu G. [The black diaphragm intraocular lens implantation]. Zhonghua Yan Ke Za Zhi 2001; 37:434-6. [PMID: 11840751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To evaluate the clinical effect of the black diaphragm intraocular lens (IOL) implantation. METHODS The black diaphragm IOL implantation performed on 23 cases (23 eyes) of traumatic aniridia (21 eyes) and congenital aniridia (2 eyes) was studied retrospectively. RESULTS Photophobia was reduced obviously and the naked visual acuity was improved in all 23 cases after the black diaphragm IOL implantation, VA > or = 0.1 in 16 cases (70%). The complications included vitreous hemorrhage (2 eyes) in the operation, and there were exudates on the surface of IOL (13 eyes), IOP elevation (3 eyes), macular hole (1 eye), recurrent retinal detachment (1 eye) and corneal decompensation (5 eyes) after the operation. CONCLUSION The black diaphragm IOL implantation provides an effective means of treating traumatic or congenital aniridia, but the indication should be strictly controlled.
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Affiliation(s)
- Y Bao
- Department of Ophthalmology, People's Hospital of Beijing University, Beijing 100044, China
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Pan X, Niu G, Liu H. Microwave-assisted extraction of tanshinones from Salvia miltiorrhiza bunge with analysis by high-performance liquid chromatography. J Chromatogr A 2001; 922:371-5. [PMID: 11486886 DOI: 10.1016/s0021-9673(01)00949-9] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.5] [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: 01/31/2023]
Abstract
A novel microwave-assisted extraction (MAE) method has been developed for the extraction and determination of tanshinones (tanshinone IIA, cryptotanshinone and tanshinone I) from the root of Salvia miltiorrhiza bunge with analysis by HPLC. Various experimental conditions were investigated to optimize the percentage extraction. Under appropriate MAE conditions, such as ethanol concentrations of 95% (v/v), MAE for 2 min, liquid/solid ratio of 10:1 (ml/g), the percentage extraction can reach high in a short time. The percentage extraction (tanshinone IIA: 0.29%; cryptotanshinone: 0.23%; tanshinone I: 0.11%) by MAE was the same or even higher than conventional extraction methods. MAE only needs 2 min, but extraction at room temperature, heat reflux extraction, ultrasonic extraction and Soxhlet extraction need 24 h, 45 min, 75 min and 90 min, respectively. MAE was also available in pilot plant form for larger scale extraction.
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Affiliation(s)
- X Pan
- Young Scientist Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing
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Abstract
In the present study, a new microwave-enhanced dehydration and solvent washing purification of penicillin G sulfoxide technique has been developed. The results show that microwave irradiation can dehydrate penicillin G sulfoxide from a water content of 14-26 to below 0.5% in 40-60 min in N2 or air. After washing with ethyl acetate to remove impurities and residual water, the penicillin G sulfoxide can be used to synthesize cephalosporanic acid. The recovery of cephalosporanic acid was equal to and the purity of cephalosporanic acid was higher by 2% than that of the current dehydration technique. FTIR spectroscopy was used to study the process of microwave-enhanced dehydration and solvent washing purification of penicillin G sulfoxide.
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Affiliation(s)
- X Pan
- Young Scientist Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Chemical Metallurgy, Chinese Academy of Sciences, 100080, Beijing, People's Republic of China
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Garcia R, Bowman TL, Niu G, Yu H, Minton S, Muro-Cacho CA, Cox CE, Falcone R, Fairclough R, Parsons S, Laudano A, Gazit A, Levitzki A, Kraker A, Jove R. Constitutive activation of Stat3 by the Src and JAK tyrosine kinases participates in growth regulation of human breast carcinoma cells. Oncogene 2001; 20:2499-513. [PMID: 11420660 DOI: 10.1038/sj.onc.1204349] [Citation(s) in RCA: 573] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2000] [Revised: 02/01/2001] [Accepted: 02/05/2001] [Indexed: 01/13/2023]
Abstract
Constitutive activation of signal transducer and activator of transcription (STAT) proteins has been detected in a wide variety of human primary tumor specimens and tumor cell lines including blood malignancies, head and neck cancer, and breast cancer. We have previously demonstrated a high frequency of Stat3 DNA-binding activity that is constitutively-induced by an unknown mechanism in human breast cancer cell lines possessing elevated EGF receptor (EGF-R) and c-Src kinase activities. Using tyrosine kinase selective inhibitors, we show here that Src and JAK family tyrosine kinases cooperate to mediate constitutive Stat3 activation in the absence of EGF stimulation in model human breast cancer cell lines. Inhibition of Src or JAKs results in dose-dependent suppression of Stat3 DNA-binding activity, which is accompanied by growth inhibition and induction of programmed cell death. In addition, transfection of a dominant-negative form of Stat3 leads to growth inhibition involving apoptosis of breast cancer cells. These results indicate that the biological effects of the Src and JAK tyrosine kinase inhibitors are at least partially mediated by blocking Stat3 signaling. While EGF-R kinase activity is not required for constitutive Stat3 activation in breast cancer cells, EGF stimulation further increases STAT DNA-binding activity, consistent with an important role for EGF-R in STAT signaling and malignant progression. Analysis of primary breast tumor specimens from patients with advanced disease revealed that the majority exhibit elevated STAT DNA-binding activity compared to adjacent non-tumor tissues. Our findings, taken together, suggest that tyrosine kinases transduce signals through Stat3 protein that contribute to the growth and survival of human breast cancer cells in culture and potentially in vivo.
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Affiliation(s)
- R Garcia
- Molecular Oncology Program, H. Lee Moffitt Cancer Center and Research Institute, University of South Florida College of Medicine, Tampa, Florida, FL 33612 USA
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Niu G, Shain KH, Huang M, Ravi R, Bedi A, Dalton WS, Jove R, Yu H. Overexpression of a dominant-negative signal transducer and activator of transcription 3 variant in tumor cells leads to production of soluble factors that induce apoptosis and cell cycle arrest. Cancer Res 2001; 61:3276-80. [PMID: 11309279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Gene therapy of B16 tumors with a dominant-negative signal transducer and activator of transcription (Stat3) variant, designated Stat3beta, results in inhibition of tumor growth and tumor regression. Although only 10-15% of the tumor cells are transfected in vivo, the Stat3beta-induced antitumor effect is associated with massive apoptosis of B16 tumor cells, indicative of a potent bystander effect. Here, we provide evidence that blocking Stat3 signaling in B16 cells results in release of soluble factors that are capable of inducing apoptosis and cell cycle arrest of nontransfected B16 cells. RNase protection assays using multi-template probes specific for key physiological regulators of apoptosis reveal that overexpression of Stat3beta in B16 tumor cells induces the expression of the apoptotic effector, tumor necrosis factor-related apoptosis-inducing ligand. These in vitro results suggest that the observed in vivo bystander effect leading to tumor cell growth inhibition is mediated, at least in part, by soluble factors produced as a result of overexpression of Stat3beta in tumor cells.
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Affiliation(s)
- G Niu
- Immunology Program, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, Florida 33613, USA
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Niu G. [The stockades of northern Anhui in the mid-19th century]. Qing Shi Yan Jiu 2001:24-32. [PMID: 19697477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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Niu G, Tan J, Turner JG, Brabham JG, Burdelya LG, Crucian BE, Wall-Apelt H, Zhao RJ, Yu H. Bing de ling, a Chinese herbal formula, stimulates multifaceted immunologic responses in mice. DNA Cell Biol 2000; 19:515-20. [PMID: 10975469 DOI: 10.1089/10445490050128449] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Bing de ling is a Chinese herbal formula most commonly used in complementary medical settings against viral disorders. We have found that bing de ling potentiates upregulation of immune activity when administered to mice in dosages proportional to those used clinically. These mice demonstrated significant elevation of interleukin-2 (IL-2) and interferon-gamma (IFN-gamma) production in splenocytes and enhancement of macrophage, natural killer cell, and lymphokine-activated killer cell cytotoxicity. These data are consistent with bing de ling's clinically observed efficacy against viruses and identify the formula as a promising candidate for clinical trials against diverse diseases that may respond to increased immunologic activity.
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Affiliation(s)
- G Niu
- Immunology Program, H. Lee Moffitt Cancer Center & Research Institute, Department of Medical Microbiology and Immunology, University of South Florida College of Medicine, Tampa, USA
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Niu G, Heller R, Catlett-Falcone R, Coppola D, Jaroszeski M, Dalton W, Jove R, Yu H. Gene therapy with dominant-negative Stat3 suppresses growth of the murine melanoma B16 tumor in vivo. Cancer Res 1999; 59:5059-63. [PMID: 10537273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Whereas signal transducers and activators of transcription were originally discovered as mediators of normal cytokine signaling, constitutive activation of certain signal transducer and activator of transcription proteins, including Stat3, has been found in increasing numbers of human cancers. Recently, a causal role for Stat3 activation in oncogenesis has been demonstrated, suggesting that Stat3 represents a novel target for cancer therapy. We report here that in vitro expression of a Stat3 variant with dominant-negative properties, Stat3beta, induced cell death in murine B16 melanoma cells that harbored activated Stat3. By contrast, expression of Stat3beta had no effect on normal fibroblasts or the Stat3-negative murine tumor MethA, suggesting that only tumor cells with activated Stat3 have become dependent on this pathway for survival. Significantly, gene therapy by electroinjection of the Stat3beta expression vector into preexisting B16 tumors caused inhibition of tumor growth as well as tumor regression. This Stat3beta-induced antitumor effect is associated with apoptosis of the B16 tumor cells in vivo. These findings demonstrate for the first time that interfering with Stat3 signaling induces potent antitumor activity in vivo and thus identify Stat3 as a potential molecular target for therapy of human cancers harboring activated Stat3.
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Affiliation(s)
- G Niu
- H. Lee Moffitt Cancer Center and Research Institute, and Department of Microbiology and Immunology, University of South Florida College of Medicine, Tampa 33612, USA
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Niu G, Fang W, Zheng J. [The suppressing effect of TIMP-3 gene transfection on the invasion and metastasis of human lung carcinoma cells line]. Zhonghua Bing Li Xue Za Zhi 1998; 27:421-4. [PMID: 11244951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVE The purpose of this study is to determine if increasing levels of tissue inhibitor of metalloproteinase 3 (TIMP-3) expression could suppress the malignant phenotype of human cancer cells. METHODS The recombinant expression vector, which contains full length cDNA of human TIMP-3, was constructed and transfected into BE1 cell line by lipofectin technique. The invasive and spontaneous metastatic potential was examined. RESULTS TIMP-3 mRNA expression in TIMP-3 gene transfected BE1 cells was upregulated as detected by Northern blot. The invasion of TIMP-3 gene-transfected cells across matrigel-coated filters was significantly decreased when compared with controls. Following subcutaneous injection into nude mice, the TIMP-3 transfected cells suppressed primary tumor growth, as characterized by reduced tumor incidence (9/12 vs 6/6), longer latency and reduced metastatic potential to the lungs (1/12 vs 5/6) and lymph nodes (5/12 vs 6/6). CONCLUSION The results suggest that upregulation of TIMP-3 expression in BE1 cells resulted in suppression of the invasive potential of BE1 cells in vitro as well as tumorigenic and metastatic potential in nude mice.
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Affiliation(s)
- G Niu
- Department of Pathology, Beijing Medical University, Beijing 100083
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