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Chen JN, Pan ZH, Sun FL, Wu PX, Zheng ST, Zhuang GL, Long LS, Zheng LS, Kong XJ. Tuning Electrocatalytic Water Oxidation Activity: Insights from the Active-Site Distance in LnCu 6 Clusters. Small 2024:e2401044. [PMID: 38516941 DOI: 10.1002/smll.202401044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/12/2024] [Indexed: 03/23/2024]
Abstract
Atomically precise metal clusters serve as a unique model for unraveling the intricate mechanism of the catalytic reaction and exploring the complex relationship between structure and activity. Herein, three series of water-soluble heterometallic clusters LnCu6, abbreviated as LnCu6-AC (Ln = La, Nd, Gd, Er, Yb; HAC = acetic acid), LnCu6-IM (Ln = La and Nd; IM = Imidazole), and LnCu6-IDA (Ln = Nd; H2IDA = Iminodiacetic acid) are presented, each featuring a uniform metallic core stabilized by distinct protected ligands. Crystal structure analysis reveals a triangular prism topology formed by six Cu2+ ions around one Ln3+ ion in LnCu6, with variations in Cu···Cu distances attributed to different ligands. Electrocatalytic oxygen evolution reaction (OER) shows that these different LnCu6 clusters exhibit different OER activities with remarkable turnover frequency of 135 s-1 for NdCu6-AC, 79 s-1 for NdCu6-IM and 32 s-1 for NdCu6-IDA. Structural analysis and Density Functional Theory (DFT) calculations underscore the correlation between shorter Cu···Cu distances and improves OER catalytic activity, emphasizing the pivotal role of active-site distance in regulating electrocatalytic OER activities. These results provide valuable insights into the OER mechanism and contribute to the design of efficient homogeneous OER electrocatalysts.
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Affiliation(s)
- Jia-Nan Chen
- State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Zhong-Hua Pan
- State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Fu-Li Sun
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Ping-Xin Wu
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Shou-Tian Zheng
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Gui-Lin Zhuang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - La-Sheng Long
- State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Lan-Sun Zheng
- State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Xiang-Jian Kong
- State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
- Fujian Key Laboratory of Rare-earth Functional Materials, Fujian Shanghai Collaborative Innovation Centre of Rare-earth Functional Materials, Longyan, 366300, China
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Lin CB, Sheng YX, Sun FL, Chen WX, Zhuang GL. Visible-Light Photocatalytic Overall Water Splitting on a B 4C 3/C xN y Z-Scheme Heterojunction: Role of Ultrafast Carrier Recombination-Transfer Kinetics. J Phys Chem Lett 2023; 14:11447-11456. [PMID: 38085811 DOI: 10.1021/acs.jpclett.3c02784] [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: 12/22/2023]
Abstract
Herein, combining density functional theory (DFT) calculations with nonadiabatic molecular dynamics (NAMD), we built a computational framework to rationally screen from a series of 2D conjugated carbon nitrides (CNs) to match with B4C3, resulting in the excellent direct Z-scheme photocatalyst (B4C3/C6N6) for overall water splitting (OWS). Studies on interface engineering and ultrafast dynamics of carrier recombination-transfer show that in the B4C3/C6N6 system, compared with the slower interlayer migration process of carriers, strong nonadiabatic coupling and longer quantum decoherence time accelerates weak carrier interlayer recombination on a subpicosecond time scale, enabling simultaneous triggering of hydrogen evolution reaction (HER) with ΔG = -0.23 eV and spontaneous oxygen evolution reaction (OER) in the absence of sacrificial or cocatalysts. In general, our work will promote the design of efficient direct Z-scheme photocatalysts from an ultrafast dynamics perspective.
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Affiliation(s)
- Cun-Biao Lin
- H-PSI Computational Chemistry Lab, Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P.R. China
| | - Yin-Xiao Sheng
- H-PSI Computational Chemistry Lab, Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P.R. China
| | - Fu-Li Sun
- H-PSI Computational Chemistry Lab, Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P.R. China
| | - Wen-Xian Chen
- H-PSI Computational Chemistry Lab, Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P.R. China
| | - Gui-Lin Zhuang
- H-PSI Computational Chemistry Lab, Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P.R. China
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Wang YJ, Zhuang GL, Zhang JW, Luo F, Cheng X, Sun FL, Fu SS, Lu TB, Zhang ZM. Co-Dissolved Isostructural Polyoxovanadates to Construct Single-Atom-Site Catalysts for Efficient CO 2 Photoreduction. Angew Chem Int Ed Engl 2023; 62:e202216592. [PMID: 36478491 DOI: 10.1002/anie.202216592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/06/2022] [Accepted: 12/06/2022] [Indexed: 12/12/2022]
Abstract
We explored a co-dissolved strategy to embed mono-dispersed Pt center into V2 O5 support via dissolving [PtV9 O28 ]7- into [V10 O28 ]6- aqueous solution. The uniform dispersion of [PtV9 O28 ]7- in [V10 O28 ]6- solution allows [PtV9 O28 ]7- to be surrounded by [V10 O28 ]6- clusters via a freeze-drying process. The V centers in both [PtV9 O28 ]7- and [V10 O28 ]6- were converted into V2 O5 via a calcination process to stabilize Pt center. These double separations can effectively prevent the Pt center agglomeration during the high-temperature conversion process, and achieve 100 % utilization of Pt in [PtV9 O28 ]7- . The resulting Pt-V2 O5 single-atom-site catalysts exhibit a CH4 yield of 247.6 μmol g-1 h-1 , 25 times higher than that of Pt nanoparticle on the V2 O5 support, which was accompanied by the lactic acid photooxidation to form pyruvic acid. Systematical investigations on this unambiguous structure demonstrate an important role of Pt-O atomic pair synergy for highly efficient CO2 photoreduction.
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Affiliation(s)
- Yu-Jie Wang
- Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Northeast Normal University, Jilin, 130024, China.,Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Gui-Lin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Jiang-Wei Zhang
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, P. R. China
| | - Fang Luo
- Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Northeast Normal University, Jilin, 130024, China
| | - Xin Cheng
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Fu-Li Sun
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Shan-Shan Fu
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Tong-Bu Lu
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin, 300384, China
| | - Zhi-Ming Zhang
- Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Northeast Normal University, Jilin, 130024, China.,Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin, 300384, China
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Wang YJ, Zhuang GL, Zhang JW, Luo F, Cheng X, Sun FL, Fu SS, Lu TB, Zhang ZM. Co‐Dissolved Isostructural Polyoxovanadates to Construct Single‐Atom‐Site Catalysts for Efficient CO2 Photoreduction. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202216592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yu-Jie Wang
- Northeast Normal University College of Chemistry CHINA
| | - Gui-Lin Zhuang
- Zhejiang University of Technology College of Chemical Engineering CHINA
| | - Jiang-Wei Zhang
- Inner Mongolia University College of Chemistry and Chemical Engineering CHINA
| | - Fang Luo
- Northeast Normal University College of Chemistry CHINA
| | - Xin Cheng
- Tianjin University of Technology Institute for New Energy Materials and Low Carbon Technologies CHINA
| | - Fu-Li Sun
- Zhejiang University of Technology College of Chemical Engineering CHINA
| | - Shan-Shan Fu
- Tianjin University of Technology Institute for New Energy Materials and Low Carbon Technologies CHINA
| | - Tong-Bu Lu
- Tianjin University of Technology Institute for New Energy Materials and Low Carbon Technologies CHINA
| | - Zhi-Ming Zhang
- Tianjin University of Technology School of Materials Science and Engineering No. 391 Binshuixi Road 300384 Tianjin CHINA
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Liang N, Wu QQ, Li JH, Gao FY, Sun FL, Guo CX. Causes of misdiagnosis in assessing tubal patency by transvaginal real-time three-dimensional hysterosalpingo-contrast sonography. Rev Assoc Med Bras (1992) 2019; 65:1055-1060. [PMID: 31531601 DOI: 10.1590/1806-9282.65.8.1055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 05/02/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVE This study aims to investigate the causes of misdiagnosis in assessing tubal patency by transvaginal real-time three-dimensional hysterosalpingo-contrast sonography (TVS RT-3D-HyCoSy), in order to improve the diagnostic efficiency of TVS RT-3D-HyCoSy. METHODS A total of 162 oviducts of 83 infertility patients were examined by TVS RT-3D-HyCoSy. These results were compared with the gold standard for laparoscopic dye studies, and the misdiagnosed cases were analyzed. RESULTS TVS RT-3D-HyCoSy revealed that 68 oviducts were unobstructed and 94 obstructed. The results for the 144 oviducts were in line with the gold standard, while those for 18 oviducts were not. The accuracy rate of the TVS RT-3D-HyCoSy was 88.9%, and the misdiagnosis rate was 11.1%. The main causes of misdiagnosis included contrast medium countercurrent and diffusion, oviduct spasm, abnormal shape or position of the oviduct, pelvic adhesion, and poor imaging operation. CONCLUSION TVS RT-3D-HyCoSy can well-evaluate tubal patency, and understand and improve the cause of misdiagnosis. Furthermore, the diagnostic efficiency of TVS RT-3D-HyCoSy can still be further improved.
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Affiliation(s)
- Na Liang
- . Department of Ultrasound, Beijing Obstetrics and Gynecology Hospital of Capital Medical University, Beijing 100026, China
| | - Qing-Qing Wu
- . Department of Ultrasound, Beijing Obstetrics and Gynecology Hospital of Capital Medical University, Beijing 100026, China
| | - Jing-Hua Li
- . Department of Ultrasound, Beijing Obstetrics and Gynecology Hospital of Capital Medical University, Beijing 100026, China
| | - Feng-Yun Gao
- . Department of Ultrasound, Beijing Obstetrics and Gynecology Hospital of Capital Medical University, Beijing 100026, China
| | - Fu-Li Sun
- . Department of Ultrasound, Beijing Obstetrics and Gynecology Hospital of Capital Medical University, Beijing 100026, China
| | - Cui-Xia Guo
- . Department of Ultrasound, Beijing Obstetrics and Gynecology Hospital of Capital Medical University, Beijing 100026, China
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Zheng S, Sun FL, Zhang HJ, Shi WZ, Ma JH. [Current applications of artificial intelligence in tumor histopathology]. Zhonghua Zhong Liu Za Zhi 2018; 40:885-889. [PMID: 30605976 DOI: 10.3760/cma.j.issn.0253-3766.2018.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The tasks of artificial intelligence (AI) in tumor histopathology include image segmentation and classification. Currently, the specific contents including lymph node metastasis, pathological classification, grade and prognostic evaluation of malignant diseases, such as breast cancer, lung cancer and prostate cancer, have been studied by AI. Evaluation of sentinel lymph node metastasis of breast cancer has been the most mature application of AI technology, whose level can be analogous to the excellent pathologists. In the future, with the close cooperation of pathologists and engineers, the research of AI will be focus on improving the technology of simple and repetitive clinical diagnosis and differential diagnosis, such as the diagnosis of sentinel lymph node metastasis of breast cancer from biopsy frozen section and the judgment of incisal margin. Ultimately, AI will help us to precisely diagnose the tumor.
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Affiliation(s)
- S Zheng
- Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - F L Sun
- Digital China Health Technologies Corporation, Beijing 100080, China
| | - H J Zhang
- Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - W Z Shi
- Digital China Health Technologies Corporation, Beijing 100080, China
| | - J H Ma
- Department of Urology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
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Kang YY, Sun FL, Zhang Y, Wang Z. SIRT1 acts as a potential tumor suppressor in oral squamous cell carcinoma. J Chin Med Assoc 2018; 81:416-422. [PMID: 29050728 DOI: 10.1016/j.jcma.2017.09.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 06/12/2017] [Accepted: 09/29/2017] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Oral squamous cell carcinoma (OSCC) is the most common malignant tumor in oral cancer, however, the mechanism underlying OSCC tumorigenesis is unknown. SIRT1, has been considered a prominent tumor-suppressing/promoting gene in various solid tumors, although the precise role of SIRT1 in OSCC progression remains unknown. METHODS SIRT1 expression was assessed in surgically resected specimens from patients with OSCC for histopathologic factors. SIRT1 levels in OSCC were determined, SIRT1 overexpression was achieved on transfecting OSCC cells with a SIRT1-containing plasmid, followed by evaluation of proliferative ability and invasiveness of these cells. RESULTS SIRT1 levels were significantly lower in patients with OSCC than in controls (p < 0.05). Moreover, SIRT1 levels in patients with OSCC were significantly associated with the lymphovascular permeation but not with the sex, age, stage and location. Furthermore, SIRT1 overexpression inhibited proliferation and invasion in OSCC cells. CONCLUSION The present results suggest that SIRT1 is a potential tumor suppressor in OSCC.
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Affiliation(s)
- Yuan-Yuan Kang
- Department of Emergency and Oral Medicine, The School of Stomatology, China Medical University & Liaoning Institute of Dental Research & Liaoning Province Key Laboratory of Oral Diseases & Liaoning Province Translational Medicine Research Center of Oral Diseases, Shenyang, Liaoning, China.
| | - Fu-Li Sun
- Department of Emergency and Oral Medicine, The School of Stomatology, China Medical University & Liaoning Institute of Dental Research & Liaoning Province Key Laboratory of Oral Diseases & Liaoning Province Translational Medicine Research Center of Oral Diseases, Shenyang, Liaoning, China
| | - Ying Zhang
- Department of Emergency and Oral Medicine, The School of Stomatology, China Medical University & Liaoning Institute of Dental Research & Liaoning Province Key Laboratory of Oral Diseases & Liaoning Province Translational Medicine Research Center of Oral Diseases, Shenyang, Liaoning, China
| | - Zhe Wang
- Department of Pathology, The Second Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Shenyang, Liaoning, China
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Abstract
We have used line HS-2 of Drosophila melanogaster, carrying a silenced transgene in the pericentric heterochromatin, to investigate in detail the chromatin structure imposed by this environment. Digestion of the chromatin with micrococcal nuclease (MNase) shows a nucleosome array with extensive long-range order, indicating regular spacing, and with well-defined MNase cleavage fragments, indicating a smaller MNase target in the linker region. The repeating unit is ca. 10 bp larger than that observed for bulk Drosophila chromatin. The silenced transgene shows both a loss of DNase I-hypersensitive sites and decreased sensitivity to DNase I digestion within an array of nucleosomes lacking such sites; within such an array, sensitivity to digestion by MNase is unchanged. The ordered nucleosome array extends across the regulatory region of the transgene, a shift that could explain the loss of transgene expression in heterochromatin. Highly regular nucleosome arrays are observed over several endogenous heterochromatic sequences, indicating that this is a general feature of heterochromatin. However, genes normally active within heterochromatin (rolled and light) do not show this pattern, suggesting that the altered chromatin structure observed is associated with regions that are silent, rather than being a property of the domain as a whole. The results indicate that long-range nucleosomal ordering is linked with the heterochromatic packaging that imposes gene silencing.
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Affiliation(s)
- F L Sun
- Department of Biology, Washington University, St. Louis, Missouri 63130, USA
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Sun FL, Cuaycong MH, Craig CA, Wallrath LL, Locke J, Elgin SC. The fourth chromosome of Drosophila melanogaster: interspersed euchromatic and heterochromatic domains. Proc Natl Acad Sci U S A 2000; 97:5340-5. [PMID: 10779561 PMCID: PMC25830 DOI: 10.1073/pnas.090530797] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.7] [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: 12/07/1999] [Indexed: 11/18/2022] Open
Abstract
The small fourth chromosome of Drosophila melanogaster (3.5% of the genome) presents a puzzle. Cytological analysis suggests that the bulk of the fourth, including the portion that appears banded in the polytene chromosomes, is heterochromatic; the banded region includes blocks of middle repetitious DNA associated with heterochromatin protein 1 (HP1). However, genetic screens indicate 50-75 genes in this region, a density similar to that in other euchromatic portions of the genome. Using a P element containing an hsp70-white gene and a copy of hsp26 (marked with a fragment of plant DNA designated pt), we have identified domains that allow for full expression of the white marker (R domains), and others that induce a variegating phenotype (V domains). In the former case, the hsp26-pt gene shows an accessibility and heat-shock-inducible activity similar to that seen in euchromatin, whereas in the latter case, accessibility and inducible expression are reduced to levels typical of heterochromatin. Mapping by in situ hybridization and by hybridization of flanking DNA sequences to a collection of cosmid and bacterial artificial chromosome clones shows that the R domains (euchromatin-like) and V domains (heterochromatin-like) are interspersed. Examination of the effect of genetic modifiers on the variegating transgenes shows some differences among these domains. The results suggest that heterochromatic and euchromatic domains are interspersed and closely associated within this 1.2-megabase region of the genome.
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Affiliation(s)
- F L Sun
- Department of Biology, Washington University, St. Louis, MO 63130, USA
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Affiliation(s)
- F L Sun
- Department of Biology, Washington University, St. Louis, Missouri 63130, USA
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Ji QS, Ermini S, Baulida J, Sun FL, Carpenter G. Epidermal growth factor signaling and mitogenesis in Plcg1 null mouse embryonic fibroblasts. Mol Biol Cell 1998; 9:749-57. [PMID: 9529375 PMCID: PMC25303 DOI: 10.1091/mbc.9.4.749] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [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: 11/14/1997] [Accepted: 01/14/1998] [Indexed: 02/07/2023] Open
Abstract
Gene targeting techniques and early mouse embryos have been used to produce immortalized fibroblasts genetically deficient in phospholipase C (PLC)-gamma1, a ubiquitous tyrosine kinase substrate. Plcg1(-/-) embryos die at embryonic day 9; however, cells derived from these embryos proliferate as well as cells from Plcg1(+/+) embryos. The null cells do grow to a higher saturation density in serum-containing media, as their capacity to spread out is decreased compared with that of wild-type cells. In terms of epidermal growth factor receptor activation and internalization, or growth factor induction of mitogen-activated protein kinase, c-fos, or DNA synthesis in quiescent cells, PLcg1(-/-) cells respond equivalently to PLcg1(+/+) cells. Also, null cells are able to migrate effectively in a wounded monolayer. Therefore, immortalized fibroblasts do not require PLC-gamma1 for many responses to growth factors.
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Affiliation(s)
- Q S Ji
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
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Abstract
The gene IGF2, which encodes a fetal insulin-like growth factor, is imprinted, so only one of two parental copies of the gene is expressed. The altered expression of IGF2 has been implicated in Beckwith-Wiedemann syndrome, a human fetal overgrowth syndrome, which is characterized by overgrowth of several organs and an increased risk of developing childhood tumours. We have introduced Igf2 transgenes into the mouse genome by using embryonic stem cells, which leads to transactivation of the endogenous Igf2 gene. The consequent overexpression of Igf2 results in most of the symptoms of Beckwith-Wiedemann syndrome, including prenatal overgrowth, polyhydramnios, fetal and neonatal lethality, disproportionate organ overgrowth including tongue enlargement, and skeletal abnormalities. These phenotypes establish Igf2 overexpression as a key determinant of Beckwith-Wiedemann syndrome.
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Affiliation(s)
- F L Sun
- Laboratory of Developmental Genetics and Imprinting, Department of Development and Genetics, The Babraham Institute, Cambridge, UK
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Sun FL, Li DM, Li GY. [Influence of different combination of mental activity and respiratory cycle on heart rate variability]. Zhongguo Zhong Xi Yi Jie He Za Zhi 1996; 16:153-5. [PMID: 9208537] [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: 02/04/2023]
Abstract
By means of spectral analysis of P-R interval, different characteristics of heart rate variability in different form of respiratory exercise was observed. The results of observation on 32 volunteers showed that mental activity that affected respiration can influence the function of autonomic nerve system in a different way. When the mind was concentrated at the inspiration, the function of autonomic nerve system was kept in balance, and both the sympathetic and the vagal activities enhanced significantly and while mind concentrated at the expiration could induce a reduction of vagal activity so as to produce marked change in the sympathovagal balance.
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Affiliation(s)
- F L Sun
- Xiyuan Hospital, China Academy of TCM, Beijing
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Reik W, Bowden L, Constancia M, Dean W, Feil R, Forné T, Kelsey G, Maher E, Moore T, Sun FL, Walter J. Regulation of Igf2 imprinting in development and disease. Int J Dev Biol 1996; Suppl 1:53S-54S. [PMID: 9087693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- W Reik
- Laboratory of Developmental Genetics and Imprinting, Babraham Institute, Cambridge
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Chen K, Chen KJ, Sun FL. [Effects of an ever-young pill on decreased intelligence and symptoms associated with aging]. Zhong Xi Yi Jie He Za Zhi 1989; 9:398-401, 387-8. [PMID: 2791157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A test was carried out to evaluate the effect of Ever-Young Pill (EYP) on decreased fluid intelligence and symptoms associated with aging. Nootropil and placebo were used as control drugs. Random, single-blind and self-control observation methods were applied. 90 days were spent for the clinical study. 154 older persons were divided into three groups (EYP 63, nootropil 60, placebo 31). The method of measuring intelligence was talking between man and computer. The computerized program was worked out by our department. The measure included eight parameters. A semi-quantitative method was used to evaluate the symptoms of aging. The main results were as follows: In the group of EYP, there were significant differences (P less than 0.01) in speed of calculation (SC, 5.92 +/- 2.5, 5.1 +/- 2.1), speed of digits and pictures (SDP, 24.2 +/- 6.2, 21.7 +/- 6.7), two digits span (2.8 +/- 1.0, 3.2 +/- 0.8) and other two parameters before and after treatment. In the group of nootropil, SDP and SC were also improved significantly. In the normal control's there was not any evident change. In the early declined health group treated with EYP and nootropil separately, four parameters were improved in each group. The best effect of EYP obtained was on Kidney Yang deficiency and Kidney and Heart Qi Yang deficiency Syndromes. In other syndromes, the results were less satisfactory. By using EYP for treating symptoms of aging the total effective rate was 96.8%, nootropil 71.7% and placebo 44.2%. There were noticeable differences in three groups. Those results suggested that EYP was one of the effective therapies for decreased fluid intelligence with aging.
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Sun FL, Lei SP. [Clinical method of evaluating declined intelligence with aging and its application in traditional Chinese medicine research]. Zhong Xi Yi Jie He Za Zhi 1989; 9:203-6, 195. [PMID: 2758514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A practical program edited by BASIC was used in this test. The test included 7 indexes of fluid intelligence by using the method of talking between man and computer: speed of mental mathematic, digit-symbol, choice reaction time, counting visual number span, tracing reaction and recognition of meaningless figures. Through the principal component analysis and multiple stepwise regression techniques, the authors found out the mathematical model of the intelligence aging from 506 normal subjects and established a measuring system for the declined fluid intelligence and physiological age could be measured with the system. The correlation of the repetition of the test was 0.9528. This method was suitable for mental workers of 46-75 years old. The measured accuracy among the subjects of 50-70 years old was higher. The method was applied practically in clinical evaluation of the effects of traditional herbal medicines and Qigong on fluid intelligence with aging. Through the analysis of validity and reliability, it was proved that this method was suitable for geriatric research.
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Chen YQ, Chen KJ, Sun FL. [Power spectral analysis of heart rate in qi deficiency and both qi and yin deficiency in patients with coronary heart disease]. Zhong Xi Yi Jie He Za Zhi 1989; 9:76-8, 67. [PMID: 2736691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Qi deficiency (QD) and both Qi and Yin deficiency (QYD) are most common in TCM classification of CHD patients with insufficiency syndrome. The authors used the power spectrum of spontaneous heart rate fluctuation (PSHF) to analyze the function of cardiac regulation in 30 QD patients and 27 QYD patients with CHD and compare with the control group of 30 cases for discussing the association between different TCM syndrome patterns and the function of cardiac nerve regulation. The main results were as follows: (1) Low-frequency areas of PSHF in QYD (34.15 +/- 11.60%) were significantly higher than those in QD group (26.24 +/- 11.57%) and the control group (27.80 +/- 11.65%). The L/H ratio in QYD (1.78 +/- 0.96) was significantly higher than those in QD (0.91 +/- 0.64) and the control group (0.98 +/- 0.58). The changes of PSHF in QYD could have some relations with the increasing of the activity of sympathetic nervous system. (2) The change in body posture was used as a load test to study cardiovascular regulation in different TCM patterns of insufficiency syndrome with CHD. In control group the L/H ratio increased with the change of body posture from 0.98 +/- 0.58 to 4.29 +/- 0.89 (P less than 0.001), while in QD group and QYD group increased from 0.91 +/- 0.64 to 1.67 +/- 0.83 (P less than 0.05) and 1.78 +/- 0.96 to 1.85 +/- 0.87 (P greater than 0.2) respectively. The results suggested that cardiovascular baroreceptor reflex was decreased in CHD patients, and QYD group was inferior to DQ group.
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Sun FL, Lin DM. [An animal model for a heart deficiency syndrome induced by sleep deprivation]. Zhong Xi Yi Jie He Za Zhi 1987; 7:35-7, 6. [PMID: 3594711] [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: 01/06/2023]
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Sun FL. [A new insect virus of Pieris rapae. III. Nucleic acid properties of the virus]. Wei Sheng Wu Xue Bao 1986; 26:188-90. [PMID: 3751017] [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: 01/07/2023]
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Li DM, Sun FL, Ning LL. [Effects of anisodine on EEG power spectrum, frequency distribution and coherence in rats]. Zhongguo Yao Li Xue Bao 1985; 6:225-7. [PMID: 2945358] [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: 01/03/2023]
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Wang JZ, Sun FL, Han HW, Zhang BH, Yuan JS, Ma L. [Effect of total flavones of Sophora flavescens root on arrhythmia of cultured rat heart cells]. Zhongguo Yao Li Xue Bao 1983; 4:32-5. [PMID: 6223495] [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: 01/19/2023]
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Han HW, Wang JZ, Sun FL. [Effect of dl-demethylcoclaurine on cultured rat heart cells (author's transl)]. Zhongguo Yao Li Xue Bao 1981; 2:111-4. [PMID: 6278830] [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: 01/19/2023]
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Sun FL. [A simple method for recording beats of cultured myocardial cell (author's transl)]. Sheng Li Ke Xue Jin Zhan 1981; 12:90-2. [PMID: 7031890] [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: 01/23/2023]
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