276
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Gao P, Shen YW, Fang R, Hao XH, Qiu ZH, Yang F, Yan XB, Wang Q, Gong XJ, Liu XY, Liang YM. Copper-catalyzed one-pot trifluoromethylation/aryl migration/carbonyl formation with homopropargylic alcohols. Angew Chem Int Ed Engl 2014; 53:7629-33. [PMID: 24938432 DOI: 10.1002/anie.201403383] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 04/08/2014] [Indexed: 11/10/2022]
Abstract
A novel copper-catalyzed one-pot functionalization of homopropargylic alcohols that involves trifluoromethylation, aryl migration, and formation of a carbonyl moiety has been developed. This reaction constitutes the first direct conversion of homopropargylic alcohols into CF3-containing 3-butenal or 3-buten-1-one derivatives in a regioselective manner. Mechanistic studies indicate that the 1,4-aryl migration proceeds through a radical pathway.
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277
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Gao P, Shen YW, Fang R, Hao XH, Qiu ZH, Yang F, Yan XB, Wang Q, Gong XJ, Liu XY, Liang YM. Copper-Catalyzed One-Pot Trifluoromethylation/Aryl Migration/Carbonyl Formation with Homopropargylic Alcohols. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403383] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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278
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Feng C, Xu Y, Hua T, Liu XY, Fang M. Irregularly shaped lacunar infarction: risk factors and clinical significance. ARQUIVOS DE NEURO-PSIQUIATRIA 2014; 71:769-73. [PMID: 24212512 DOI: 10.1590/0004-282x20130119] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 05/17/2013] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Our study focused on acute lacunar infarct shapes to explore the risk factors and clinical significance of irregularly shaped lacunar infarctions. METHODS Based on the shape of their acute lacunar infarct, patients (n=204) were classified into the "regular" group or "irregular" group. The characteristics of the lacunar infarction were compared between the regular and irregular groups, between patients with and without neurological deterioration, and between patients with different modified Rankin scale (mRS) scores. The risk factors for irregularly shaped lacunar infarctions, neurological deterioration, and high mRS scores were identified. RESULTS Blood pressure variability (BPV) was an independent risk factor for irregularly shaped lacunar infarction. Infarction size, prevalence of advanced leukoaraiosis, and irregularly shaped lacunar infarcts were independent risk factors for higher mRS scores. CONCLUSIONS The irregularly shaped lacunar infarcts were correlated with BPV. Irregularly shaped lacunar infarctions and leukoaraiosis may be associated with unfavorable clinical outcomes.
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279
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Zhou PX, Zheng L, Ma JW, Ye YY, Liu XY, Xu PF, Liang YM. Palladium-Catalyzed/Norbornene-Mediated CH Activation/N-Tosylhydrazone Insertion Reaction: A Route to Highly Functionalized Vinylarenes. Chemistry 2014; 20:6745-51. [DOI: 10.1002/chem.201402097] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Indexed: 11/10/2022]
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280
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Wu RH, Li Q, Tan Y, Liu XY, Huang J. Depression in silent lacunar infarction: a cross-sectional study of its association with location of silent lacunar infarction and vascular risk factors. Neurol Sci 2014; 35:1553-9. [PMID: 24752391 PMCID: PMC4176570 DOI: 10.1007/s10072-014-1794-5] [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: 01/18/2014] [Accepted: 04/03/2014] [Indexed: 01/16/2023]
Abstract
Most previous studies reported a close link between fresh infarcts and post-stroke depression. However, studies on the relation of depression and silent lacunar infarction (SLI) are limited. This study aims to analyze the effects of SLI and the vascular risk factors on depression. A total of 243 patients with SLI were divided into depression and non-depression groups. The presence and location of SLI were evaluated with magnetic resonance imaging. Depression was assessed with the Patient Health Questionnaire-9 and vascular risks factors were collected. We used t tests and χ2 test to compare the baseline characteristics of the two groups and the multivariate logistic regression model to identify the risk factors for depression. Univariate analysis results showed that the proportion of patients with SLI in basal ganglia was significantly higher in the depression group (65.0 versus 32.8 %; P < 0.001) than in the non-depression group, and multiple prevalent factors had significant differences between the two groups. However, on multivariate logistic analysis, some of these factors were eliminated, and SLI in basal ganglia remained an independent predictor of depression with an odds ratio of 3.128 (P = 0.018). In addition, vascular risk factors, including high body mass index level, presence of inflammation markers (e.g., CRP, TNF-α, Hs-CRP, and IL-6), and lack of physical activity, were associated with depression. Our findings suggest that SLI in basal ganglia is associated with a higher risk of depression. Vascular risk factors, which are intertwined, may propose the pathological basis of depression in SLI.
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281
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Zhong SY, Chen YX, Fang M, Zhu XL, Zhao YX, Liu XY. Low-dose levodopa protects nerve cells from oxidative stress and up-regulates expression of pCREB and CD39. PLoS One 2014; 9:e95387. [PMID: 24743653 PMCID: PMC3990701 DOI: 10.1371/journal.pone.0095387] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Accepted: 03/25/2014] [Indexed: 11/18/2022] Open
Abstract
Objective This study aimed to investigate the influence of low-dose levodopa (L-DOPA) on neuronal cell death under oxidative stress. Methods PC12 cells were treated with L-DOPA at different concentrations. We detected the L-DOPA induced reactive oxygen species (ROS). Meanwhile, MTT and LDH assay were performed to determine the proliferation and growth of PC12 cells with or without ROS scavenger. In addition, after pretreatment with L-DOPA at different concentrations alone or in combination with CD39 inhibitor, PC12 cells were incubated with hydrogen peroxide (H2O2) and the cell viability was evaluated by MTT and LDH assay. In addition, the expression of pCREB and CD39 was detected by immunofluorescence staining and Western blot assay in both cells and rat’s brain after L-DOPA treatment. Results After treatment with L-DOPA for 3 days, the cell proliferation and growth were promoted when the L-DOPA concentration was <30 µM, while cell proliferation was comparable to that in control group when the L-DOPA concentration was >30 µM. Low dose L-DOPA could protect the PC12 cells from H2O2 induced oxidative stress, which was compromised by CD39 inhibitor. In addition, the expression of CD39 and pCREB increased in both PC12 cells and rats’ brain after L-DOPA treatment. Conclusions L-DOPA at different concentrations has distinct influence on proliferation and growth of PC12 cells, and low dose (<30 µM) L-DOPA protects PC12 cells against oxidative stress which might be related to the up-regulation of CD39 and pCREB expression.
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282
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Zhang L, Li LH, Wang YQ, Yang YF, Liu XY, Liang YM. Ruthenium-Catalyzed Direct C–H Amidation of Arenes: A Mechanistic Study. Organometallics 2014. [DOI: 10.1021/om500080z] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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283
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Zhao YX, Cui M, Chen SF, Dong Q, Liu XY. Amelioration of ischemic mitochondrial injury and Bax-dependent outer membrane permeabilization by Mdivi-1. CNS Neurosci Ther 2014; 20:528-38. [PMID: 24712408 DOI: 10.1111/cns.12266] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 03/10/2014] [Accepted: 03/10/2014] [Indexed: 01/11/2023] Open
Abstract
AIMS Disturbance of the balance between mitochondrial fission and fusion has been implicated in cerebral ischemia and several neurodegenerative diseases, whereas the underlying mechanisms remain poorly understood. In the present study, we attempted to investigate the role of dynamin-related protein 1 (Drp1), a key mitochondrial fission protein, in the pathogenesis of cerebral ischemia. METHODS Using Drp1 siRNA or Mdivi-1, a small molecule inhibitor of Drp1, we examined the effect of Drp1 knockdown or inhibition on oxygen-glucose deprivation (OGD)-induced mitochondrial dysfunction and death of SH-SY-5Y cells. Cell death and viability were evaluated with LDH and MTT assays, respectively, and mitochondrial morphology, mitochondrial membrane potential (Δψm), and ATP production were assessed using epifluorescence microscopy, flow cytometry, and HPLC, respectively. Moreover, to examine the effect of Drp1 inhibition on ischemic brain injury, middle cerebral artery occlusion (MCAO) mice were injected (i.p.) with Mdivi1, and blood-brain barrier permeability, brain water content, and cell apoptosis were assessed. RESULTS Knockdown or inhibition of Drp1 by Mdivi-1 significantly attenuated OGD-induced cell death in SH-SY-5Y cells, associated with reduced morphological change of mitochondria and attenuated Bax insertion,oligomerization. Moreover, treatment of the MCAO mice with Mdivi-1 remarkably reduced the infarct volume and neurological deficits in a dose-dependent manner, associated with marked reduction of mitochondrial fragmentation and BAX expression. CONCLUSIONS Down-regulation or inhibition of Drp1 may reduce cerebral ischemic damage through maintaining normal mitochondrial morphology and function, and decreasing Bax insertion and oligomerization in mitochondria.
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284
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Wu RH, Feng C, Xu Y, Hua T, Liu XY, Fang M. Late-onset depression in the absence of stroke: associated with silent brain infarctions, microbleeds and lesion locations. Int J Med Sci 2014; 11:587-92. [PMID: 24782647 PMCID: PMC4003543 DOI: 10.7150/ijms.8025] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 03/25/2014] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Late-onset depression (LOD) is a frequent mood disorder among elderly. Previous studies have proved that LOD is associated with cerebral silent lesions especially white matter lesions (WML) and yielded the "vascular depression" hypothesis to explain the pathogenesis of LOD. However, there were relatively few studies about the association between silent brain infarctions (SBIs), microbleeds (MBs) and the prevalence of LOD. In this study we sought to evaluate the presence, accumulation and locations of SBIs and MBs, and explore the possible association between them and LOD. METHODS 65 patients of LOD diagnosed according to DSM-IV and 270 subjects of control group were enrolled and scanned by MRI to analyze the presence, numbers and locations of SBIs and MBs. Clinical and radiological characteristics were compared between LOD patients and control group. Logistic regression models were constructed to identify the independent risk factors for LOD. RESULTS LOD patients had higher prevalence and numbers of both SBIs and MBs. SBIs and MBs in the left hemisphere, SBIs in basal ganglia and lobar MBs were all independent risk factors for LOD. CONCLUSION The presence of both SBIs and MBs were associated with a higher rate LOD. Lesions in some specific locations might be critical for the presence of LOD.
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285
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Xu G, Gong L, Yang Z, Liu XY. What makes spider silk fibers so strong? From molecular-crystallite network to hierarchical network structures. SOFT MATTER 2014; 10:2116-23. [PMID: 24652059 DOI: 10.1039/c3sm52845f] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A Hierarchical Network (HN) model of soft matter was put forward to explain the mechanical properties of animal silk fibers. At the nano-micro level, the silk fibers consist of a bundle of twisted nano-fibrils with strong friction among them. At the nano-fibril level, β-crystallites together with silk molecular chains constitute the molecular networks. According to the model, the influences of different structural parameters, i.e. the ordering, and the density of β-nanocrystallites, on the breaking stress of silk fibers were analyzed quantitatively. It turns out that a better alignment of β-crystallites, a larger number of β-crystallites within the cross-section of a nano-fibril and a smaller effective loading area of a peptide chain will correlatively lead to stronger silk fibers. This is in excellent agreement with our observations for both spider dragline and silkworm silk fibers, and explains the fact that the spider dragline silk fibers having a lower crystallinity are much stronger than silkworm silk fibers. Furthermore, it was found that at the nanofibril scale, the interlock among the adjacent nanofibrils in the nanofibril bundle serves as a crack-stopper, which restricts the propagation of cracks. Such a structure reinforces the silk fibers significantly. The knowledge obtained will shed light on how to obtain ultra-strong fibrous materials from the structural point of view.
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286
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Wang J, Zhu HT, Li YX, Wang LJ, Qiu YF, Qiu ZH, Zhong MJ, Liu XY, Liang YM. Facile Synthesis of Halogenated Spiroketals via a Tandem Iodocyclization. Org Lett 2014; 16:2236-9. [DOI: 10.1021/ol500741a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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287
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Reiter RJ, Rosales-Corral SA, Liu XY, Acuna-Castroviejo D, Escames G, Tan DX. Melatonin in the oral cavity: physiological and pathological implications. J Periodontal Res 2014; 50:9-17. [PMID: 24665831 DOI: 10.1111/jre.12176] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/15/2014] [Indexed: 01/20/2023]
Abstract
BACKGROUND AND OBJECTIVES The purpose of this article was to summarize what is known about the function of melatonin in the oral cavity. MATERIAL AND METHODS Databases were searched for the relevant published literature to 30 November, 2013. The following search items were used in various combinations: melatonin, gingiva, periodontium, inflammation, herpes, alveolar bone, periodontal ligament, dental implants, xerostomia, methacrylate, chlorhexidine, cancer. The literature uncovered is summarized herein. RESULTS Salivary melatonin levels exhibit a circadian rhythm with highest values at night. Melatonin has both receptor-mediated and receptor-independent actions in cells of the oral cavity. Melatonin is released into the saliva by the acinar cells of the major salivary glands and via the gingival fluid. Functions of melatonin in the oral cavity are likely to relate primarily to its anti-inflammatory and antioxidant activities. These actions may suppress inflammation of the gingiva and periodontium, reduce alveolar bone loss, abrogate herpes lesions, enhance osteointegration of dental implants, limit oral cancer, and suppress disorders that have a free radical component. Sublingual melatonin tablets or oral melatonin sprays and topical melatonin-containing gel, if used on a regular basis, may improve overall oral health and reduce mucosal lesions. CONCLUSION Collectively, the results indicate that endogenously-produced and exogenously-applied melatonin are beneficial to the oral cavity.
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288
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Li G, Li X, Wu H, Yang X, Zhang Y, Chen L, Wu X, Cui L, Wu L, Luo J, Liu XY. CD123 targeting oncolytic adenoviruses suppress acute myeloid leukemia cell proliferation in vitro and in vivo. Blood Cancer J 2014; 4:e194. [PMID: 24658372 PMCID: PMC3972701 DOI: 10.1038/bcj.2014.15] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 02/14/2014] [Indexed: 12/21/2022] Open
Abstract
We report here a novel strategy to redirect oncolytic adenoviruses to CD123 by carry a soluble coxsackie-adenovirus receptor (sCAR)-IL3 expression cassette in the viral genome to form Ad.IL3, which sustainably infected acute myeloid leukemia (AML) cells through CD123. Ad.IL3 was further engineered to harbor gene encoding manganese superoxide dismutase (MnSOD) or mannose-binding plant lectin Pinellia pedatisecta agglutinin (PPA), forming Ad.IL3-MnSOD and Ad.IL3-PPA. As compared with Ad.IL3 or Ad.sp-E1A control, Ad.IL3-MnSOD and Ad.IL3-PPA significantly suppressed in vitro proliferation of HL60 and KG-1 cells. Elevated apoptosis was detected in HL60 and KG-1 cells treated with either Ad.IL3-MnSOD or Ad.IL3-PPA. The caspase-9–caspase-7 pathway was determined to be activated by Ad.IL3-MnSOD as well as by Ad.IL3-PPA in HL60 cells. In an HL60/Luc xenograft nonobese diabetic/severe-combined immunodeficiency mice model, Ad.IL3-MnSOD and Ad.IL3-PPA suppressed cancer cell growth as compared with Ad.IL3. A significant difference of cancer cell burden was detected between Ad.IL3 and Ad.IL3-PPA groups at day 9 after treatment. Furthermore, Ad.IL3-MnSOD significantly prolonged mouse survival as compared with Ad.sp-E1A. These findings demonstrated that Ad.IL3-gene could serve as a novel agent for AML therapy. Harboring sCAR-ligand expression cassette in the viral genome may provide a universal method to redirect oncolytic adenoviruses to various membrane receptors on cancer cells resisting serotype 5 adenovirus infection.
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289
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Xia XF, Wang YQ, Zhang LL, Song XR, Liu XY, Liang YM. Palladium-Catalyzed CH Activation and Intermolecular Annulation with Allenes. Chemistry 2014; 20:5087-91. [DOI: 10.1002/chem.201304300] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Revised: 12/18/2013] [Indexed: 11/10/2022]
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290
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Mei ZQ, Fu SY, Yu HQ, Yang LQ, Duan CG, Liu XY, Gong S, Fu JJ. Genetic characterization and authentication of Dimocarpus longan Lour. using an improved RAPD technique. GENETICS AND MOLECULAR RESEARCH 2014; 13:1447-55. [PMID: 24634243 DOI: 10.4238/2014.march.6.3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Dimocarpus longan Lour. is an edible and traditional herb in China, commonly referred to as longon. An improved randomly amplified polymorphic DNA (RAPD) protocol was here developed in order to determine the geographical origins of D. longan samples collected from 5 provinces in the southern and southwestern areas of China, including Sichuan, Hainan, Fujian, Guangdong, and Guangxi. Generally, the improved RAPD method generated good fingerprinting of the 5 samples using the selected 17 primers. In particular, primers SBS-A5, SBS-A13, SBS-I9, SBS-I20, SBS-M1, and SBS-Q12 produced distinguishable bands that clearly separated all 5 cultivars, suggesting that there are variations in RAPD genetic sites among the samples. The similarity index ranged from 0.69 to 0.76. The Sichuan and Hainan clades clustered together with a 0.73 similarity index. The Guangxi and Fujian clades clustered together with a 0.76 similarity index, and they formed the sister clade to the Sichuan/Hainan clade with a 0.71 similarity index. The Guangdong clade was in a basal polytomy with a 0.70 similarity index. Based on the abundant DNA polymorphisms, these longan accessions are distinguishable using our improved RAPD technique. Therefore, RAPD analysis is an effective technique in distinguishing the geographical origins of D. longan. Moreover, the improved method could also be employed for a variety of applications including genetic diversity and fingerprinting analyses.
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291
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Luo JY, Hua HL, Chen ZS, Zhou ZZ, Yang YF, Zhou PX, He YT, Liu XY, Liang YM. Metal-free cascade radical cyclization of 1,6-enynes with aldehydes. Chem Commun (Camb) 2014; 50:1564-6. [DOI: 10.1039/c3cc48339h] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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292
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Wang LJ, Zhu HT, Qiu YF, Liu XY, Liang YM. Electrophilic ipso-iodocyclization of N-benzyl-N-(1-naphthyl)propiolamides: synthesis of complex polycyclic lactams. Org Biomol Chem 2014; 12:643-50. [DOI: 10.1039/c3ob42020e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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293
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Wang LJ, Zhu HT, Wang AQ, Qiu YF, Liu XY, Liang YM. Gold-Catalyzed Tandem [3,3]-Propargyl Ester Rearrangement Leading to (E)-1H-Inden-1-ones. J Org Chem 2013; 79:204-12. [DOI: 10.1021/jo402396h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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294
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He YT, Li LH, Yang YF, Zhou ZZ, Hua HL, Liu XY, Liang YM. Copper-Catalyzed Intermolecular Cyanotrifluoromethylation of Alkenes. Org Lett 2013; 16:270-3. [DOI: 10.1021/ol403263c] [Citation(s) in RCA: 127] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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295
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Wang LS, Jiao Y, Huang Y, Liu XY, Gibson G, Bennett B, Hamre KM, Li DW, Zhao HY, Gelernter J, Kranzler HR, Farrer LA, Lu L, Wang YJ, Gu WK. Critical evaluation of transcription factor Atf2 as a candidate modulator of alcohol preference in mouse and human populations. GENETICS AND MOLECULAR RESEARCH 2013; 12:5992-6005. [PMID: 24338393 DOI: 10.4238/2013.november.26.9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
In prior work, congenic strains carrying the DBA/2Igb (D2) region of chromosome 2 (Chr2) for alcohol preference were bred onto a C57BL/6Ibg (B6) background and as predicted were found to reduce voluntary consumption. Subsequently, interval-specific congenic recombinant strains (ISCRS) were generated and also tested. These ISCRS strains reduced the quantitative trait loci (QTL) interval to a comparatively small 3.4 Mb region. Here, we have exploited an integrative approach using both murine and human populations to critically evaluate candidate genes within this region. First, we used bioinformatics tools to search for genes relevant to alcohol preference within the QTL region. Second, we searched for single nucleotide polymorphisms (SNPs) within exons of every gene in this region. Third, we conducted follow-up microarray analyses to identify differentially expressed genes between the B6 and ISCRS strains in mice from each group. Fourth, we analyzed correlations between the expression level of candidate genes and phenotypes of alcohol preference in a large family of BXD recombinant inbred strains derived from B6 and D2. Finally, we evaluated SNP segregation in both BXD mouse strains and in humans who were heavy alcohol drinkers or non-drinkers. Among several potential candidate genes in this region, we identified activating transcription factor 2 (Atf2) as the most plausible gene that would influence alcohol preference. However, the candidacy of Atf2 was only weakly supported when we used a genetic network approach and by focused reanalysis of genome-wide association study data from European-American and African-American populations. Thus, we cannot conclude that Atf2 plays a role in the regulation of the QTL of mouse Chr2.
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Zhu HT, Wang J, Qiu ZH, Wang LJ, Zhong MJ, Liu XY, Liang YM. Electrophile-Promoted Tandem Cyclization of α,β-Diynyl Ketodiols: A Facile Synthesis of Tetrahalogenated Spiroketals. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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297
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Liu XH, Wang YP, Wang LX, Chen Z, Liu XY, Liu LB. Exendin-4 protects murine MIN6 pancreatic β-cells from interleukin-1β-induced apoptosis via the NF-κB pathway. J Endocrinol Invest 2013; 36:803-11. [PMID: 23609920 DOI: 10.3275/8938] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND Glucagon-like peptide-1 (GLP-1) and its potent analog, exendin-4, are well known to inhibit β- cell apoptosis and promote β-cell proliferation. Meanwhile, cytokines, such as interleukin-1β (IL-1β), stimulate inducible nitric oxide synthase (iNOS) expression and nitric oxide overproduction leading to β-cell damage. However, the protective mechanisms of GLP-1 in β-cells exposed to cytokines have not been fully elucidated. AIMS In this study, the protective effects of exendin-4 on IL-1β-induced apoptosis were investigated in murine MIN6 pancreatic β-cells. The role of nuclear factor-κB (NF-κB) signaling in this process was also explored. METHODS The effects of exendin-4 pre-treatment on IL-1β-induced apoptosis were investigated by Hoechst/PI and Annexin V/PI staining. Levels of iNOS and NF-κB proteins were investigated by Western blotting and cytoplasmic nitrite levels were determined using Griess reagent. RESULTS IL-1β treatment (range, 5-40 ng/ml) for 24 h was positively correlated with nitrite production (R2=0.9668, p<0.01), a significant increase in the percentage of apoptotic cells (p<0.01) and a concomitant dose-dependent increase in cytoplasmic levels of iNOS and NF-κB p65 activation. N-acetyl- L-cysteine (NAC), NG-nitro-L-arginine methyl ester (L-NAME) and pyrrolidine dithiocarbamate (PDTC), partially rescued apoptotic β-cells, suggesting involvement of NF-κB-iNOS-nitrite in this process. Exendin-4 (100 nM) treatment significantly decreased IL-1β-induced apoptosis (p<0.01), downregulated NF-κB activation and subsequently decreased iNOS and nitrite levels in IL-1β-induced β-cells (p<0.001), in a similar manner to L-NAME, PDTC and NAC. CONCLUSIONS These results suggest that exendin-4 protects against IL-1β- induced apoptosis in β-cells via downregulation of the NF- κB-iNOS-nitrite pathway.
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298
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Zhou ZZ, Hua HL, Luo JY, Chen ZS, Zhou PX, Liu XY, Liang YM. Metal-free synthesis of 3,3-disubstituted oxindoles via 1,2-alkylarylation of activated alkenes with alcohols. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.09.058] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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299
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Rao F, Deng CY, Zhang QH, Xue YM, Xiao DZ, Kuang SJ, Lin QX, Shan ZX, Liu XY, Zhu JN, Yu XY, Wu SL. Involvement of Src tyrosine kinase and protein kinase C in the expression of macrophage migration inhibitory factor induced by H2O2 in HL-1 mouse cardiac muscle cells. Braz J Med Biol Res 2013; 46:746-51. [PMID: 24036910 PMCID: PMC3854426 DOI: 10.1590/1414-431x20132936] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Accepted: 06/06/2013] [Indexed: 11/22/2022] Open
Abstract
Macrophage migration inhibitory factor (MIF), a pleiotropic cytokine, plays an
important role in the pathogenesis of atrial fibrillation; however, the upstream
regulation of MIF in atrial myocytes remains unclear. In the present study, we
investigated whether and how MIF is regulated in response to the
renin-angiotensin system and oxidative stress in atrium myocytes (HL-1 cells).
MIF protein and mRNA levels in HL-1 cells were assayed using immunofluorescence,
real-time PCR, and Western blot. The result indicated that MIF was expressed in
the cytoplasm of HL-1 cells. Hydrogen peroxide (H2O2), but
not angiotensin II, stimulated MIF expression in HL-1 cells.
H2O2-induced MIF protein and gene levels increased in
a dose-dependent manner and were completely abolished in the presence of
catalase. H2O2-induced MIF production was completely
inhibited by tyrosine kinase inhibitors genistein and PP1, as well as by protein
kinase C (PKC) inhibitor GF109203X, suggesting that redox-sensitive MIF
production is mediated through tyrosine kinase and PKC-dependent mechanisms in
HL-1 cells. These results suggest that MIF is upregulated by HL-1 cells in
response to redox stress, probably by the activation of Src and PKC.
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Song XR, Xia XF, Song B, Tian X, Zhu HT, Zhou AX, Liu XY, Liang YM. Gold-Catalyzed Tandem Cyclization/Cycloaddition Reaction of Enynones: Highly Regioselective Synthesis of Oxabicyclic Compounds and Naphthyl Ketones. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300118] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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