101
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Gan G, Bhat A, Fernandez F, Ramachandran J, Hsu C, Choong T, Tan T. Cardiac Vignette: A Rare Case of Atrial Myopathy. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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102
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Gan G, Bhat A, Zobair K, Khoury B, Stephens M, Fernandez F, Hsu C, Tan T. Cardiac Vignette: Right Atrial Mass. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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103
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Jeyaprakash P, Gan G, Bhat A, Aladdin A, Hussain M, Bayley A, Johnston A, Kwok F, Scherrer-Crosbie M, Tan T. The Incidence of Cardiac-Toxicity and Mortality in Acute Leukaemia, Lymphoma and Sarcoma Patients Treated with Anthracyclines in a Single Australian Tertiary Centre. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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104
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Gan G, Bhat A, Goonetilleke N, Burgess D, Tan T. Cardiac Vignette: Anomalous Coronary Arteries with Coronary Artery Disease. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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105
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Jünger E, Gan G, Mick I, Seipt C, Markovic A, Sommer C, Plawecki MH, O'Connor S, Smolka MN, Zimmermann US. Adolescent Women Induce Lower Blood Alcohol Levels Than Men in a Laboratory Alcohol Self-Administration Experiment. Alcohol Clin Exp Res 2016; 40:1769-78. [PMID: 27340798 DOI: 10.1111/acer.13122] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 05/02/2016] [Indexed: 12/01/2022]
Abstract
BACKGROUND Adolescence is a critical period for the development of alcohol use disorders; drinking habits are rather unstable and genetic influences, such as male sex and a positive family history of alcoholism (FH), are often masked by environmental factors such as peer pressure. METHODS We investigated how sex and FH modulate alcohol use in a sample of 18- to 19-year-olds from the Dresden Longitudinal Study on Alcohol use in Young Adults. Adolescents reported their real-life drinking in a TimeLine Follow-Back interview. They subsequently completed a training and an experimental session of free-access intravenous alcohol self-administration (i.v. ASA) using the computer-assisted alcohol infusion system to control for environmental cues as well as for biological differences in alcohol pharmacokinetics. During i.v. ASA, we assessed subjective alcohol effects at 8 time points. RESULTS Women reported significantly less real-life drinking than men and achieved significantly lower mean arterial blood alcohol concentrations (aBACs) in the laboratory. At the same time, women reported greater sedation relative to men and rated negative effects as high as did men. A positive FH was associated with lower real-life drinking in men but not in women. In the laboratory, FH was not linked to i.v. ASA. Greater real-life drinking was significantly positively associated with higher mean aBACs in the laboratory, and all i.v. ASA indices were highly correlated across the 2 sessions. CONCLUSIONS We conclude that adolescent women chose lower aBACs because they experienced adverse alcohol effects, namely sedation and negative effects, at lower aBACs than men. A positive FH was not apparent as risk factor for drinking in our young sample. The i.v. ASA method demonstrated good external validity as well as test-retest reliability, the latter indicating that a separate training session is not required when employing the i.v. ASA paradigm.
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Müller KU, Gan G, Banaschewski T, Barker GJ, Bokde ALW, Büchel C, Conrod P, Fauth-Bühler M, Flor H, Gallinat J, Garavan H, Gowland P, Heinz A, Ittermann B, Lawrence C, Loth E, Mann K, Martinot JL, Nees F, Paus T, Pausova Z, Rietschel M, Ströhle A, Struve M, Schumann G, Smolka MN. No differences in ventral striatum responsivity between adolescents with a positive family history of alcoholism and controls. Addict Biol 2015; 20:534-45. [PMID: 24903627 DOI: 10.1111/adb.12136] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Individuals with alcohol-dependent parents show an elevated risk of developing alcohol-related problems themselves. Modulations of the mesolimbic reward circuit have been postulated as a pre-existing marker of alcoholism. We tested whether a positive family history of alcoholism is correlated with ventral striatum functionality during a reward task. All participants performed a modified version of the monetary incentive delay task while their brain responses were measured with functional magnetic resonance imaging. We compared 206 healthy adolescents (aged 13-15) who had any first- or second-degree relative with alcoholism to 206 matched controls with no biological relative with alcoholism. Reward anticipation as well as feedback of win recruited the ventral striatum in all participants, but adolescents with a positive family history of alcoholism did not differ from their matched peers. Also we did not find any correlation between family history density and reward anticipation or feedback of win. This finding of no differences did not change when we analyzed a subsample of 77 adolescents with at least one parent with alcohol use disorder and their matched controls. Because this result is in line with another study reporting no differences between children with alcohol-dependent parents and controls at young age, but contrasts with studies of older individuals, one might conclude that at younger age the effect of family history has not yet exerted its influence on the still developing mesolimbic reward circuit.
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107
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Morton JJ, Bird G, Keysar SB, Astling DP, Lyons TR, Anderson RT, Glogowska MJ, Estes P, Eagles JR, Le PN, Gan G, McGettigan B, Fernandez P, Padilla-Just N, Varella-Garcia M, Song JI, Bowles DW, Schedin P, Tan AC, Roop DR, Wang XJ, Refaeli Y, Jimeno A. XactMice: humanizing mouse bone marrow enables microenvironment reconstitution in a patient-derived xenograft model of head and neck cancer. Oncogene 2015; 35:290-300. [PMID: 25893296 PMCID: PMC4613815 DOI: 10.1038/onc.2015.94] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2014] [Revised: 02/20/2015] [Accepted: 03/03/2015] [Indexed: 12/14/2022]
Abstract
The limitations of cancer cell lines have led to the development of direct patient derived xenograft (PDX) models. However, the interplay between the implanted human cancer cells and recruited mouse stromal and immune cells alters the tumor microenvironment and limits the value of these models. To overcome these constraints, we have developed a technique to expand human hematopoietic stem and progenitor cells (HSPCs) and use them to reconstitute the radiation-depleted bone marrow of a NOD/SCID/IL2rg−/− (NSG) mouse on which a patient’s tumor is then transplanted (XactMice). The human HSPCs produce immune cells that home into the tumor and help replicate its natural microenvironment. Despite previous passage on nude mice, the expression of epithelial, stromal, and immune genes in XactMice tumors aligns more closely to that of the patient tumor than to those grown in non-humanized mice – an effect partially facilitated by human cytokines expressed by both the HSPC progeny and the tumor cells. The human immune and stromal cells produced in the XactMice can help recapitulate the microenvironment of an implanted xenograft, reverse the initial genetic drift seen after passage on non-humanized mice, and provide a more accurate tumor model to guide patient treatment.
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108
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Gan G, Bhat A, Kanthan A, Denniss A. Clinical appraisal of spontaneous coronary artery dissection (SCAD): A retrospective case series analysis. Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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109
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Bhat A, Gan G, Fernandez F, Denniss A. Cardiac vignette: Isolated case of right ventricular non-compaction. Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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110
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Bhat A, Gan G, Khoury B, Fernandez F. Cardiac vignette: Giant left ventricular aneurysm in the setting of emergent transmural ischaemia. Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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111
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Bhat A, Gan G, Fernandez F, Denniss A. Cardiac vignette: A curious case of left ventricular hypertrophy. Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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112
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Gan G, Bhat A, Stevens M, Fernandez F, Sadick N. Cardiac vignette: An interesting case of concurrent hypertrophic obstructive cardiomyopathy (HOCM) and takotsubo cardiomyopathy (TCM). Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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113
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Gan G, Keysar S, Eagles-Soukup J, Anderson R, Morton J, Le P, Glogowska M, Raben D, Wang X, Jimeno A. Hedgehog Pathway Mediates Head/Neck Radiation Resistance and Tumor Repopulation. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2013.11.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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114
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Gan G, Büchel C, Isel F. Effect of language task demands on the neural response during lexical access: a functional magnetic resonance imaging study. Brain Behav 2013; 3:402-16. [PMID: 24381811 PMCID: PMC3869681 DOI: 10.1002/brb3.133] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 01/24/2013] [Accepted: 02/15/2013] [Indexed: 11/11/2022] Open
Abstract
This study examined the effects of linguistic task demands on the neuroanatomical localization of the neural response related to automatic semantic processing of concrete German nouns combining the associative priming paradigm with functional magnetic resonance imaging (fMRI). To clarify the functional role of the inferior frontal gyrus (IFG) for semantic processing with respect to semantic decision making compared to semantic processing per se, we used a linguistic task that involved either a binary decision process (i.e., semantic categorization; Experiment 1) or not (i.e., silently thinking about a word's meaning; Experiment 2). We observed associative priming effects indicated as neural suppression in bilateral superior temporal gyri (STG), anterior cingulate cortex (ACC), occipito-temporal brain areas, and in medial frontal brain areas independently of the linguistic task. Inferior parietal brain areas were more active for silently thinking about a word's meaning compared to semantic categorization. A conjunction analysis of linguistic task revealed that both tasks activated the same left-lateralized occipito-temporo-frontal network including the IFG. Contrasting neural associative priming effects across linguistic task demands, we found a significant interaction in the right IFG. The present fMRI data give rise to the assumption that activation of the left inferior frontal gyrus (LIFG) in the semantic domain might be important for semantic processing in general and not only for semantic decision making. These findings contrast with a recent study regarding the role of the LIFG for binary decision making in the lexical domain (Wright et al. 2011).
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Jones B, Gan G, Schefter T, Miften M. SU-E-T-412: What Is the Benefit of Fiducial Marker Implantation for Pancreatic SBRT? Med Phys 2013. [DOI: 10.1118/1.4814846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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116
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Jones B, Gan G, Diot Q, Kavanagh B, Timmerman R, Miften M. Dosimetric and Deformation Effects of Image Guided Interventions During Stereotactic Body Radiation Therapy of the Prostate Using an Endorectal Balloon. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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117
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Vinogradskiy Y, Gan G, Castillo R, Castillo E, Martel M, Guerrero T, Miften M. Quantitative Assessment of Lung Function in Stage I and Stage III Lung Radiation Therapy Patients Using 4DCT-based Ventilation Imaging. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.2018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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118
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Vujcic S, Halmekyto M, Diegelman P, Gan G, Kramer DL, Janne J, Porter CW. Effects of conditional overexpression of spermidine/spermine N1-acetyltransferase on polyamine pool dynamics, cell growth, and sensitivity to polyamine analogs. J Biol Chem 2000; 275:38319-28. [PMID: 10978316 DOI: 10.1074/jbc.m003270200] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Acetylation of polyamines by spermidine/spermine N(1)-acetyltransferase (SSAT) has been implicated in their degradation and/or export out of the cell. The relationship of SSAT to polyamine pool dynamics and cell growth is not yet clearly understood. MCF-7 human breast carcinoma cells were transfected with tetracycline-regulated (Tet-off) SSAT human cDNA or murine gene. Doxycycline removal for >2 days caused a approximately 20-fold increase in SSAT RNA and a approximately 10-fold increase in enzyme activity. After 4 days, intracellular putrescine and spermidine pools were markedly lowered, and cell growth was inhibited. Growth inhibition could not be prevented with exogenous polyamines due to a previously unrecognized ability of SSAT to rapidly acetylate influxing polyamines and thereby prevent restoration of the endogenous pools. Instead, cells accumulated high levels of N(1)-acetylspermidine, N(1)-acetylspermine, and N(1), N(12)-diacetylspermine, a metabolite not previously reported in mammalian cells. Doxycycline deprivation before treatment with N(1), N(11)-diethylnorspermine markedly increased analog induction of SSAT mRNA and activity and enhanced growth sensitivity to the analog by approximately 100-fold. Overall, the findings demonstrate that conditional overexpression of SSAT lowers polyamine pools, inhibits cell growth, and markedly enhances growth sensitivity to certain analogs. The enzyme also plays a remarkably efficient role in maintaining polyamine pool homeostasis during challenges with exogenous polyamines.
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119
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Gan G, Zheng H. [Morphological and histological identification of Pholidota yunnanensis]. ZHONG YAO CAI = ZHONGYAOCAI = JOURNAL OF CHINESE MEDICINAL MATERIALS 1998; 21:223-5. [PMID: 12567953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The article reports the characters and microscopical characteristics of herba of Pholidota yunnanensis. The results can supply basis for the identification of the medicinal material.
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Gan G, Mei QB, Zhao DH. [Advance in the research of P-type calcium channel]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1997; 28:81-2. [PMID: 10921089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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121
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Gan G, Wang J. [Pharmacognostical identification of fructus Meliae azedarch]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1996; 21:142-4, 189. [PMID: 9206253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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