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Gao Q, Bai L, Zeng Y, Wang P, Zhang X, Zou R, Zhao Y. Reconstruction of Covalent Organic Frameworks by Dynamic Equilibrium. Chemistry 2015; 21:16818-22. [DOI: 10.1002/chem.201503053] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Indexed: 11/05/2022]
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102
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Li Z, Hao Q, Luo J, Xiong J, Zhang S, Wang T, Bai L, Wang W, Chen M, Wang W, Gu L, Lv K, Chen J. USP4 inhibits p53 and NF-κB through deubiquitinating and stabilizing HDAC2. Oncogene 2015; 35:2902-12. [PMID: 26411366 PMCID: PMC4895393 DOI: 10.1038/onc.2015.349] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 06/10/2015] [Accepted: 08/10/2015] [Indexed: 12/30/2022]
Abstract
Histone deacetylases (HDACs) are major epigenetic modulators involved in a broad spectrum of human diseases including cancers. As HDACs are promising targets of cancer therapy, it is important to understand the mechanisms of HDAC regulation. In this study, we show that ubiquitin-specific peptidase 4 (USP4) interacts directly with and deubiquitinates HDAC2, leading to the stabilization of HDAC2. Accumulation of HDAC2 in USP4-overexpression cells leads to compromised p53 acetylation as well as crippled p53 transcriptional activation, accumulation and apoptotic response upon DNA damage. Moreover, USP4 targets HDAC2 to downregulate tumor necrosis factor TNFα-induced nuclear factor (NF)-κB activation. Taken together, our study provides a novel insight into the ubiquitination and stability of HDAC2 and uncovers a previously unknown function of USP4 in cancers.
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Bai L, Gao Q, Xia Y, Ang CY, Bose P, Tan SY, Zhao Y. The photoirradiation induced p-n junction in naphthylamine-based organic photovoltaic cells. NANOSCALE 2015; 7:14612-14617. [PMID: 26263850 DOI: 10.1039/c5nr04471e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The bulk heterojunction (BHJ) plays an indispensable role in organic photovoltaics, and thus has been investigated extensively in recent years. While a p-n heterojunction is usually fabricated using two different donor and acceptor materials such as poly(3-hexylthiophene-2,5-diyl) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM), it is really rare that such a BHJ is constructed by a single entity. Here, we presented a photoirradiation-induced p-n heterojunction in naphthylamine-based organic photovoltaic cells, where naphthylamine as a typical p-type semiconductor could be oxidized under photoirradiation and transformed into a new semiconductor with the n-type character. The p-n heterojunction was realized using both the remaining naphthylamine and its oxidative product, giving rise to the performance improvement in organic photovoltaic devices. The experimental results show that the power conversion efficiency (PCE) of the devices could be achieved up to 1.79% and 0.43% in solution and thin film processes, respectively. Importantly, this technology using naphthylamine does not require classic P3HT and PCBM to realize the p-n heterojunction, thereby simplifying the device fabrication process. The present approach opens up a promising route for the development of novel materials applicable to the p-n heterojunction.
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Zhao D, Sun B, Jiang H, Sun S, Kong F, Ma Y, Jiang L, Bai L, Chen X, Yang P, Liu C, Xu Y, Su W, Kong W, Xu F, Jiang C. Enterovirus71 virus-like particles produced from insect cells and purified by multistep chromatography elicit strong humoral immune responses in mice. J Appl Microbiol 2015; 119:1196-205. [DOI: 10.1111/jam.12922] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 07/15/2015] [Accepted: 07/23/2015] [Indexed: 01/14/2023]
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105
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Bose P, Bai L, Ganguly R, Zou R, Zhao Y. Frontispiece: Rational Design and Synthesis of a Highly Porous Copper-Based Interpenetrated Metal-Organic Framework for High CO 2 and H 2 Adsorption. Chempluschem 2015; 80. [PMID: 31973306 DOI: 10.1002/cplu.201580862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The frontispiece shows rational construction of a twofold interpenetrated metalorganic framework (MOF) with Pt3 O4 topology using an asymmetrical tricarboxylate organic linker. In spite of having structural interpenetration, the activated MOF shows high porosity along with high CO2 and H2 uptake. Details are given in the Full Paper by Ruqiang Zou and Yanli Zhao et al. page 1259.
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Bai L, Yang X, Ang CY, Nguyen KT, Ding T, Bose P, Gao Q, Mandal AK, Sun XW, Demir HV, Zhao Y. A quinoxaline based N-heteroacene interfacial layer for efficient hole-injection in quantum dot light-emitting diodes. NANOSCALE 2015; 7:11531-11535. [PMID: 26091137 DOI: 10.1039/c5nr03197d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A series of N-heterocyclic quinoxaline derivatives was successfully synthesized and applied as hole transport layers in quantum dot light-emitting diodes (QLEDs). By inducing sp(2) N-atoms into the quinoxaline backbone, the electron affinity of the obtained material was enhanced, and its optical properties and bandgap became tunable. Quinoxaline based N-heteroacenes show a narrow bandgap, high thermal stability, and aligned film morphology. The resulting N-heteroacene polymer based QLED exhibits superior performance to poly(9-vinylcarbazole) based QLED. This study presents a strategy towards the design of novel N-rich molecules for the fabrication of QLEDs with improved performance.
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Dong Y, Huang J, Li G, Li L, Li W, Li X, Liu X, Liu Z, Lu Y, Ma A, Sun H, Wang H, Wen X, Xu D, Yang J, Zhang J, Zhao H, Zhou J, Zhu L, Committee Members:, Bai L, Cao K, Chen M, Chen M, Dai G, Ding W, Dong W, Fang Q, Fang W, Fu X, Gao W, Gao R, Ge J, Ge Z, Gu F, Guo Y, Han H, Hu D, Huang W, Huang L, Huang C, Huang D, Huo Y, Jin W, Ke Y, Lei H, Li X, Li Y, Li D, Li G, Li X, Li Z, Liang Y, Liao Y, Liu G, Ma A, Ma C, Ma D, Ma Y, Shen L, Sun J, Sun C, Sun Y, Tang Q, Wan Z, Wang H, Wang J, Wang S, Wang D, Wang G, Wang J, Wu Y, Wu P, Wu S, Wu X, Wu Z, Yang J, Yang T, Yang X, Yang Y, Yang Z, Ye P, Yu B, Yuan F, Zhang S, Zhang Y, Zhang R, Zhang Y, Zhang Y, Zhao S, Zhou X. Guidelines for the prevention, diagnosis, and treatment of infective endocarditis in adults: The Task Force for the Prevention, Diagnosis, and Treatment of Infective Endocarditis in Adults of Chinese Society of Cardiology of Chinese Medical Association, and of the Editorial Board of Chinese Journal of Cardiology. Eur Heart J Suppl 2015. [DOI: 10.1093/eurheartj/suv031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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108
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Bose P, Bai L, Ganguly R, Zou R, Zhao Y. Rational Design and Synthesis of a Highly Porous Copper-Based Interpenetrated Metal-Organic Framework for High CO2and H2Adsorption. Chempluschem 2015; 80:1259-1266. [DOI: 10.1002/cplu.201500104] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Indexed: 11/10/2022]
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109
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Qiao X, Bai L, Li H, Zhu F. Vaginal bilateral cervical lips suture in combination with intrauterine Foley catheter to arrest postpartum hemorrhage. CLIN EXP OBSTET GYN 2015. [DOI: 10.12891/ceog1807.2015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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110
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Bai L, Wang P, Bose P, Li P, Zou R, Zhao Y. Macroscopic architecture of charge transfer-induced molecular recognition from electron-rich polymer interpenetrated porous frameworks. ACS APPLIED MATERIALS & INTERFACES 2015; 7:5056-5060. [PMID: 25707851 DOI: 10.1021/am5089549] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Fluorescent and electron-rich polymer threaded into porous framework provides a scaffold for sensing acceptor molecules through noncovalent interactions. Herein, poly(9-vinylcarbazole) (PVK) threaded MIL-101 with confined nanospace was synthesized by vinyl-monomer impregnation, in situ polymerization, and interpenetration. The pore size of the resulted hybrid could be controlled by varying the time of polymerization and interpenetration. The interaction of PVK-threaded MIL-101 with guest molecules showed a charge-transfer progress with an obvious red shift in the optical spectra. Depending on the degree of the interaction, the solution color changed from blue to green or to yellow. In particular, electron-rich PVK-threaded MIL-101 could effectively probe electron-poor nitro compounds, especially 1,3,5-trinitrobenzene (TNP), a highly explosive material. This sensing approach is a colorimetric methodology, which is very simple and convenient for practical analysis and operation.
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Xing P, Chen H, Bai L, Zhao Y. Photo-triggered transformation from vesicles to branched nanotubes fabricated by a cholesterol-appended cyanostilbene. Chem Commun (Camb) 2015; 51:9309-12. [DOI: 10.1039/c5cc02816g] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Vesicles constructed from cholesteryl cyanostilbene could transform into nanotubes upon UV light irradiation, in which the photoluminescence could be fine-tuned.
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112
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Zhang SH, Shen LY, Luo J, Wu ZH, Jiang YZ, Tang GQ, Li MZ, Bai L, Li XW, Zhu L. Analysis of carcass and meat quality traits and nutritional values of hybrid wild boars under different crossing systems. GENETICS AND MOLECULAR RESEARCH 2015; 14:2608-16. [DOI: 10.4238/2015.march.30.20] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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113
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Qiao XM, Bai L, Li H, Zhu F. Vaginal bilateral cervical lips suture in combination with intrauterine Foley catheter to arrest postpartum hemorrhage. CLIN EXP OBSTET GYN 2015; 42:191-194. [PMID: 26054117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
UNLABELLED Vaginal bilateral cervical lips suture allows retention of intrauterine Foley catheter in women with a dilated cervix. This novel indication for vaginal bilateral cervix suture may be a useful adjunct to intrauterine balloon tamponade in the management of postpartum hemorrhage. OBJECTIVE To describe an effective, minimally invasive surgical technique for avoiding intrauterine balloon tamponade prolapse. MATERIALS AND METHODS This procedure was performed in the delivery room with or without bladder retraction. The cervix was grasped with two ring forceps and firmly pulled outward, two cm horizontal suture of the cervical lips was made at both the three and nine o'clock positions, which were placed two cm as close to the cervix external os, without transversing the cervicovesical reflection anteriorly and the pouch of Douglas posteriorly, then one or more Foley catheters were inserted through the cervix and inflated with saline 60-80 ml each. RESULTS The balloons remained in place and hemorrhage abated in all nine cases. CONCLUSION vaginal bilateral cervical lips suture can prevent intrauterine balloon prolapse, which may be a useful adjunct to intrauterine balloon tamponade in management of postpartum hemorrhage.
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114
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Lei HG, Shen LY, Zhang SH, Wu ZH, Shen J, Tang GQ, Jiang YZ, Li MZ, Bai L, Li XW, Zhu L. Comparison of the meat quality, post-mortem muscle energy metabolism, and the expression of glycogen synthesis-related genes in three pig crossbreeds. ANIMAL PRODUCTION SCIENCE 2015. [DOI: 10.1071/an13484] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Post-mortem muscle energy metabolism plays an important role in pork quality. To analyse the differences of meat quality and energy metabolism, three commercial pig crossbreeds frequently used in China were studied, they were DT (Duroc × Taihu; n = 16), PIC (five-way crossbreed from Pig Improvement Co., UK; n = 29) and DLY (Duroc × (Landrace × Yorkshire); n = 19) pigs. The results showed that DT pigs had a higher post-mortem pH45 min and pH24 h, lower shear force and drip loss, higher muscle free-glucose and glycogen contents, and lower lactic acid content than did PIC and DLY pigs. Post-mortem muscle free-glucose content of these three pig crossbreeds changed little, from 45 min to 96 h post-mortem. The expression levels of PRKAG3 (encoding a regulatory subunit of the AMP-activated protein kinase) and GYS1 (encoding muscle glycogen synthase) genes of DT pigs were significantly lower than those of PIC and DLY pigs. DT pigs had a higher expression level of glycogenin-1-like (encoding glycogenin) gene than did PIC and DLY pigs. In conclusion, DT pigs had better meat quality than did the other two pig crossbreeds. We deduced that the post-mortem muscle energy status and metabolism of DT pigs might be an important reason for their good meat quality, and future research should focus on the molecular and physiological mechanism of post-mortem muscle energy metabolism to find ways to improve meat quality.
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Ang CY, Tan SY, Lu Y, Bai L, Li M, Li P, Zhang Q, Selvan ST, Zhao Y. "Turn-on" fluorescence probe integrated polymer nanoparticles for sensing biological thiol molecules. Sci Rep 2014; 4:7057. [PMID: 25394758 PMCID: PMC4231329 DOI: 10.1038/srep07057] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 10/29/2014] [Indexed: 11/08/2022] Open
Abstract
A "turn-on" thiol-responsive fluorescence probe was synthesized and integrated into polymeric nanoparticles for sensing intracellular thiols. There is a photo-induced electron transfer process in the off state of the probe, and this process is terminated upon the reaction with thiol compounds. Configuration interaction singles (CIS) calculation was performed to confirm the mechanism of this process. A series of sensing studies were carried out, showing that the probe-integrated nanoparticles were highly selective towards biological thiol compounds over non-thiolated amino acids. Kinetic studies were also performed to investigate the relative reaction rate between the probe and the thiolated amino acids. Subsequently, the Gibbs free energy of the reactions was explored by means of the electrochemical method. Finally, the detection system was employed for sensing intracellular thiols in cancer cells, and the sensing selectivity could be further enhanced with the use of a cancer cell-targeting ligand in the nanoparticles. This development paves a path for the sensing and detection of biological thiols, serving as a potential diagnostic tool in the future.
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Gao Q, Bai L, Zhang X, Wang P, Li P, Zeng Y, Zou R, Zhao Y. Synthesis of Microporous Nitrogen-Rich Covalent-Organic Framework and Its Application in CO2Capture. CHINESE J CHEM 2014. [DOI: 10.1002/cjoc.201400550] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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117
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Bai L, Chen J, Liu L, McEachern D, Aguilar A, Zhou H, Yang C, Wang H, Wen J, Wang G, Zhai Y, Guo M, Yang D, Wang S. 338 BM-1252 (APG-1252): a potent dual specific Bcl-2/Bcl-xL inhibitor that achieves complete tumor regression with minimal platelet toxicity. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70464-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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118
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Ding Y, Ward WOC, Wästerlid T, Gowland PA, Peters AM, Yang J, Nakagawa S, Bai L. Three-dimensional vessel segmentation using a novel combinatory filter framework. Phys Med Biol 2014; 59:7013-29. [DOI: 10.1088/0031-9155/59/22/7013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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119
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Yalcin S, Glasberg S, Abali H, Aykan F, Bai L, Kattan J, Lim H, Park Y, Raef H, Ramos J, Rau K, Saglam S, Serdengecti S, Sevinc A, Shan Y, Shyr Y, Sriuranpong V, Turhal S, Yeh K, Hwang T. Gastroenteropancreatic Neuroendocrine Tumors (Gepnet) Registry: Update from an International Collaboration. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu345.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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120
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Wu L, Wen H, Zhou Y, Yu H, Liu Y, Bai L, Kijlstra A, Yang P. Activation of the Liver X Receptor Inhibits Th17 and Th1 Responses in Behcet’s Disease and Vogt-Koyanagi-Harada Disease. Curr Mol Med 2014; 14:712-22. [DOI: 10.2174/1566524014666140724100135] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 04/28/2014] [Accepted: 04/29/2014] [Indexed: 11/22/2022]
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121
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Jiao M, Ren F, Zhou L, Zhang X, Zhang L, Wen T, Wei L, Wang X, Shi H, Bai L, Zhang X, Zheng S, Zhang J, Chen Y, Han Y, Zhao C, Duan Z. Peroxisome proliferator-activated receptor α activation attenuates the inflammatory response to protect the liver from acute failure by promoting the autophagy pathway. Cell Death Dis 2014; 5:e1397. [PMID: 25165883 PMCID: PMC4454331 DOI: 10.1038/cddis.2014.361] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Revised: 07/19/2014] [Accepted: 07/21/2014] [Indexed: 12/11/2022]
Abstract
Peroxisome proliferator-activated receptor α (PPARα) has been reported to induce a potent anti-inflammatory response. Autophagy is a recently recognized rudimentary cellular response to inflammation and injury. The aim of the present study was to test the hypothesis that PPARα activation mediates autophagy to inhibit liver inflammation and protect against acute liver failure (ALF). PPARα expression during ALF and the impact of PPARα activation by Wy-14 643 on the hepatic immune response were studied in a D-galactosamine/lipopolysaccharide-induced mouse model. Autophagy was inhibited by 3-methyladenine or small interfering RNA (siRNA) against Atg7. In both the mouse model and human ALF subjects, PPARα was significantly downregulated in the injured liver. PPARα activation by pretreatment with Wy-14 643 protected against liver injury in mice. The protective effect of PPARα activation relied on the suppression of inflammatory mechanisms through the induction of autophagy. This hypothesis is supported by the following evidence: first, PPARα activation suppressed proinflammatory responses and inhibited phosphorylated NF-κBp65, phosphorylated JNK and phosphorylated ERK pathways in vivo. Second, protection by PPARα activation was due to the induction of autophagy because inhibition of autophagy by 3-methyladenine or Atg7 siRNA reversed liver protection and inflammation. Third, PPARα activation directly induced autophagy in primary macrophages in vitro, which protected cells from a lipopolysaccharide-induced proinflammatory response. Here, for the first time, we have demonstrated that PPARα-mediated induction of autophagy ameliorated liver injury in cases of ALF by attenuating inflammatory responses, indicating a potential therapeutic application for ALF treatment.
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Bai L, Fu ZG, Wang TB, Chen JH, Zhang PX, Zhang DY, Jiang BG. Radiological evaluation of reduction loss in unstable proximal humeral fractures treated with locking plates. Orthop Traumatol Surg Res 2014; 100:271-4. [PMID: 24709305 DOI: 10.1016/j.otsr.2013.12.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 12/10/2013] [Accepted: 12/31/2013] [Indexed: 02/02/2023]
Abstract
PURPOSE The aim of this study was to radiologically evaluate the risk of reduction loss after locking plate fixation of proximal humerus fractures. METHODS From September 2007 to April 2009, 71 patients (28 males, 43 females) with unstable proximal humeral fracture were treated with open reduction and internal fixation by locking plate. The mean follow-up time was 31.2 months (range: 26-47). The head-shaft angulation (HSA) and the humeral head height (HHH) in true anteroposterior (AP) were recorded and compared over time. All complications were noted. Shoulder function was measured by the Constant score. RESULTS Patients with ΔHSA >10° (t=2.740, P=0.008) and ΔHHH >5mm (t=2.55, P=0.019) were more likely to have impaired shoulder function. Varus collapse occurred most frequently in patients with initial reduction of HSA <125° (χ(2)=19.17, P<0.001, Fisher's exact test F<0.001). Patients with >5mm HHH decrease were strongly associated with loss of reduction (χ(2)=24.23, P<0.001, F<0.001). CONCLUSIONS Dynamic change of HSA >10° and HHH >5mm were radiological factors that indicated poor shoulder function. Intra-operative HSA >125° should be achieved to avoid reduction loss following locking plate fixation of proximal humerus fracture. LEVEL OF EVIDENCE level IV.
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Bai L, Shi G, Zhang L, Guan F, Ma Y, Li Q, Cong YS, Zhang L. Cav-1 deletion impaired hematopoietic stem cell function. Cell Death Dis 2014; 5:e1140. [PMID: 24675458 PMCID: PMC3973224 DOI: 10.1038/cddis.2014.105] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 01/27/2014] [Accepted: 02/10/2014] [Indexed: 12/21/2022]
Abstract
A tightly controlled balance between hematopoietic stem and progenitor cell compartments is required to maintain normal blood cell homeostasis throughout life, and this balance is regulated by intrinsic and extrinsic cellular factors. Cav-1 is a 22-kDa protein that is located in plasma membrane invaginations and is implicated in regulating neural stem cell and embryonic stem cell proliferation. However, the role of Cav-1 in hematopoietic stem cell (HSC) function is largely unknown. In this study, we used Cav-1−/− mice to investigate the role of Cav-1 in HSCs function during aging. The results showed that Cav-1−/− mice displayed a decreased percentage of B cells and an increased percentage of M cells in the bone marrow and peripheral blood, and these changes were due to an increased number of HSCs. FACS analysis showed that the numbers of Lin−Sca1+c-kit+ cells (LSKs), long-term HSCs (LT-HSCs), short-term HSCs and multipotent progenitors were increased in Cav-1−/− mice compared with Cav-1+/+ mice, and this increase became more pronounced with aging. An in vitro clonogenic assay showed that LT-HSCs from Cav-1−/− mice had reduced ability to self-renew. Consistently, an in vivo competitive transplantation assay showed that Cav-1−/− mice failed to reconstitute hematopoiesis. Moreover, a Cav-1 deletion disrupted the quiescence of LSKs and promoted cell cycle progression through G2/M phase. In addition, we found that Cav-1 deletion impaired the ability of HSCs to differentiate into mature blood cells. Taken together, these data suggest that Cav-1-deficient cells impaired HSCs quiescence and induced environmental alterations, which limited HSCs self-renewal and function.
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Bai L, Zhu L, Ang CY, Li X, Wu S, Zeng Y, Ågren H, Zhao Y. Iron(III)-Quantity-Dependent Aggregation-Dispersion Conversion of Functionalized Gold Nanoparticles. Chemistry 2014; 20:4032-7. [DOI: 10.1002/chem.201303958] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 12/20/2013] [Indexed: 11/08/2022]
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125
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Chen W, Wang Q, Bai L, Chen W, Wang X, Tellez CS, Leng S, Padilla MT, Nyunoya T, Belinsky SA, Lin Y. RIP1 maintains DNA integrity and cell proliferation by regulating PGC-1α-mediated mitochondrial oxidative phosphorylation and glycolysis. Cell Death Differ 2014; 21:1061-70. [PMID: 24583643 DOI: 10.1038/cdd.2014.25] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 01/20/2014] [Accepted: 01/22/2014] [Indexed: 02/07/2023] Open
Abstract
Aerobic glycolysis or the Warburg effect contributes to cancer cell proliferation; however, how this glucose metabolism pathway is precisely regulated remains elusive. Here we show that receptor-interacting protein 1 (RIP1), a cell death and survival signaling factor, regulates mitochondrial oxidative phosphorylation and aerobic glycolysis. Loss of RIP1 in lung cancer cells suppressed peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) expression, impairing mitochondrial oxidative phosphorylation and accelerating glycolysis, resulting in spontaneous DNA damage and p53-mediated cell proliferation inhibition. Thus, although aerobic glycolysis within a certain range favors cancer cell proliferation, excessive glycolysis causes cytostasis. Our data suggest that maintenance of glycolysis by RIP1 is pivotal to cancer cell energy homeostasis and DNA integrity and may be exploited for use in anticancer therapy.
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