151
|
Wu Q, Yuan L, LI T, Kirkpatrick J, Yin F, Ge Y. Knowledge-based Organ-at-Risk Sparing Models and Individualized Trade-offs in Intensity Modulated Radiation Therapy Planning. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.075] [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]
|
152
|
Abstract
The primary prevention of cardiovascular disease relies on the ability to identify at-risk individuals long before the development of overt events. In the past decade, research into circulating, genetic and imaging biomarkers to augment traditional methods of risk prediction has only achieved modest success. Emerging technologies in the fields of genomics, metabolomics and proteomics are providing new platforms for biomarker discovery. Here, we review current concepts in the evaluation and discovery of cardiovascular biomarkers. Further research is needed to identify new biomarkers to successfully stratify risk of cardiovascular disease in low-risk populations, as well as to test whether management strategies informed by biomarker testing are better than standard of care.
Collapse
|
153
|
Ba K, Yang X, Wu L, Wei X, Fu N, Fu Y, Cai X, Yao Y, Ge Y, Lin Y. Jagged-1-mediated activation of notch signalling induces adipogenesis of adipose-derived stem cells. Cell Prolif 2012; 45:538-44. [PMID: 23046039 DOI: 10.1111/j.1365-2184.2012.00850.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 07/19/2012] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVES Notch signalling plays an important role in many cell activities, involving proliferation, migration, differentiation and cell death. The aim of this study was to investigate effects of such signalling on adipogenesis of mouse adipose-derived stem cells (mASCs). MATERIALS AND METHODS Jagged1 (50 and 100 ng/ml) was added to mASCs to activate Notch signalling, 2 days before adipogenic induction. At 5 and 7 days after induction, oil red-O staining was performed to evaluate lipid accumulation. Then real-time PCR was performed to examine expression of Notch downstream genes (Notch-1, -2, Hes-1 and Hey-1) and adipogenic transcription factor (PPAR-γ). Expressions of Hes-1 and PPAR-γ at protein level were confirmed by immunofluorescence staining. RESULTS Our data indicated that Jagged1 promoted adipogenic differentiation of mASCs. Moreover, Jagged1 also increased expression of Notch downstream genes and PPAR-γ. Expressions of Hes-1 and PPAR-γ were found to be enhanced in Jagged1 pre-treated mASCs when compared to controls. DISCUSSION The results led to the conclusion that activation of Notch signalling had stimulated adipogenesis of mASCs in the presence of adipogenic medium by promoting expression of PPAR-γ.
Collapse
|
154
|
Einert TR, Schmidt G, Binnig G, Balacescu O, Balacescu L, Rus M, Buiga R, Tudoran O, Todor N, Nagy V, Irimie A, Neagoe I, Yacobi R, Ustaev E, Berger RR, Barshack I, Kaur K, Henderson S, Cutts A, Domingo E, Woods J, Motley C, Dougherty B, Middleton M, Hassan B, Wang Y, Beasley E, Naley M, Schuh A, Tomlinson I, Taylor J, Planchard D, Lueza B, Rahal A, Lacroix L, Ngocamus M, Auger N, Saulnier P, Dorfmuller P, Le Chevalier T, Celebic A, Pignon JP, Soria JC, Besse B, Sun YH, Wang R, Li CG, Pan YJ, Chen HQ, Chouchane L, Shan J, Kizhakayil D, Aigha I, Dsouza S, Noureddine B, Gabbouj S, Mathew R, Hassen E, Chouchane L, Shan S, al-Rumaihi K, al-Bozom I, al-Said S, Rabah D, Farhat K, Kizhakayil D, Aigha I, Jakobsen Falk IA, Green KHZ, Lotfi K, Fyrberg A, Pejovic T, Li H, Mhawech-Fauceglia P, Hoatlin M, Guo MG, Huang M, Ge Y, Hess K, Wei C, Zhang W, Bogush TA, Dudko EA, Nureev MV, Kamensky AA, Polotsky BE, Tjulandin SA, Davydov MI, Caballero M, Hasmats J, Green H, Quanz M, Buhler C, Sun JS, Dutreix M, Cebotaru CL, Buiga R, Placintar AN, Ghilezan N, Balogh ZB, Reiniger L, Rajnai H, Csomor J, Szepesi A, Balogh A, Deak L, Gagyi E, Bodor C, Matolcsy A, Bozhenko VK, Rozhkova NI, Kudinova EA, Bliznyukov OP, Vaskevich EN, Trotsenko ID, Bozhenko VK, Rozhkova NI, Kharchenko NV, Kudinova EA, Bliznyukov OP, Kiandarian IV, Trotsenko ID, Pulito C, Terrenato I, Sacconi A, Biagioni F, Mottolese M, Blandino G, Muti P, Falvo E, Strano S, Mori F, Sacconi A, Ganci F, Covello R, Zoccali C, Biagini R, Blandino G, Strano S, Palmer GA, Wegdam W, Meijer D, Kramer G, Langridge J, Moerland PD, de Jong SM, Vissers JP, Kenter GG, Buist MR, Aerts JMFG, Milione M, de Braud F, Buzzoni R, Pusceddu S, Mazzaferro V, Damato A, Pelosi G, Garassino M, de Braud F, Broggini M, Marabese M, Veronese S, Ganzinelli M, Martelli O, Ganci F, Bossel N, Sacconi A, Fontemaggi G, Manciocco V, Sperduti I, Falvo E, Strigari L, Covello R, Muti P, Strano S, Spriano G, Domany E, Blandino G, Donzelli S, Sacconi A, Bellissimo T, Alessandrini G, Strano S, Carosi MA, Pescarmona E, Facciolo F, Telera S, Pompili A, Blandino G, de Vriendt V, de Roock W, di Narzo AF, Tian S, Biesmans B, Jacobs B, de Schutter J, Budzinska E, Sagaert X, Delorenzi M, Simon I, Tejpar S, Zhu Y, Wang HK, Ye DW, Denisov E, Tsyganov M, Tashireva L, Zavyalova M, Perelmuter V, Cherdyntseva N, Kim YC, Jang T, Oh IJ, Kim KS, Ban H, Na KJ, Ahn SJ, Kang H, Kim WJ, Park C, Abousamra NK, El-Din MS, Azmy EA. Diagnostics. Ann Oncol 2012. [DOI: 10.1093/annonc/mds161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
155
|
Yuan L, Ge Y, Li T, Yin F, Wu QJ. MO-D-BRB-10: Modeling Inter-Patient Variation of Organ-At-Risk Sparing in IMRT Plans: An Evidence-Based Plan Quality Evaluation. Med Phys 2012; 39:3868. [PMID: 28518274 DOI: 10.1118/1.4735791] [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: 11/07/2022] Open
Abstract
PURPOSE To develop a predictive model to assess the quality of critical organ dose sparing in IMRT plans by providing patient specific dose sparing references, based on an array of patient anatomical features and prior planning experience. METHODS Contributions of various patient anatomical features to the inter-patient OAR dose sparing variation in IMRT planning were systematically studied using machine learning method based on high quality prior plans. The dependence of anatomical factor on OAR dosimetric parameters is formulated into predictive models. The OAR dosimetric parameters generated by these predictive models represent the "best feasible" clinical outcomes based on past planning experiences. IMRT plans of 88 prostate, 106 head-and-neck (HN) and 21 spine SBRT treatments were used to train the models. The final models were tested by additional 24 prostate and 48 HN plans. The model for spine SBRT was tested by the leave-one-out method. RESULTS For HN and prostate planning, the significant patient anatomical features that affect OAR sparing are: the distance between OAR and PTV, the portion of OAR volume within an OAR specific distance range, the overlap volume between OAR and PTV, and the portion of OAR volume outside the primary treatment field. For spine SBRT planning, the most significant patient anatomical feature that affects cord sparing is the tightness of the geometric enclosure of PTV surrounding the cord and the homogeneity of PTV dose coverage. The dosimetric parameters predicted for the test patient cases using the models were in agreement with those from the clinical plans in more than 75% of the cases. CONCLUSIONS The developed predictive models indicated substantial correlation between some important patient anatomical features and OAR dose sparing based on expert experiences. These models can be used as effective tools for evaluating the quality of treatment plans customized to individual patient's anatomy. Partially supported by a master research agreement with Varian Medical System, Inc.
Collapse
|
156
|
Guo M, Huang M, Ge Y, Hess K, Wei C, Zhang W. P1.11 Stage-Associated Difference in Microrna Expression in Lung Adenocarcinoma from Smokers and Non-Smokers. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)31302-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
157
|
Yuan L, Ge Y, Li T, Yin F, Wu QJ. SU-E-T-626: Individualized Trade-Off of Dose Coverage and Sparing in IMRT Planning. Med Phys 2012; 39:3850. [PMID: 28517546 DOI: 10.1118/1.4735716] [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: 11/07/2022] Open
Abstract
PURPOSE We present an evidence-based approach to quantifying the dose sparing trade-offs between different Organs-at-risk (OARs) and the trade-off between OAR dose sparing and target dose coverage in IMRT plans. METHODS The interaction between dose sparing of different OARs and between target dose coverage and OAR dose sparing are modeled using high-quality prior IMRT plans of prostate, head-and-neck (HN), and spine SBRT cases. The dose sparing for each OAR is modeled separately at first based on their own anatomical features and then the contributions from other OARs or PTV are added into the model to account for the possible trade-off effects in plans whose modeled OAR DVH deviates from that of actual plans. RESULTS The most significant OAR dose sparing trade-off is between bladder and rectum in prostate plans and between the left and the right parotids in HN plans. Trade-off is most apparent when the parotid on one side has very large overlap with the PTV. In most of these plans (83%), the planer chooses to loosen the dose constraint for that parotid in exchange for lower contra-lateral parotid median dose. The interaction between OAR dose sparing and PTV dose coverage is most significant in spine SBRT plans, (R2=0.37). Another important factor is the tightness of the geometric enclosure of PTV around OAR (R2=0.38). CONCLUSIONS The dosimetric trade-off between multiple OARs and between PTV and OAR in IMRT planning is quantified by studying prior plans. These findings will help physicians and planners obtain better OAR dose sparing by exploring different trade-off options for individual patient cases. Partially supported by a master research agreement with Varian Medical Systems, Inc.
Collapse
|
158
|
Wu L, Wang T, Ge Y, Cai X, Wang J, Lin Y. Secreted factors from adipose tissue increase adipogenic differentiation of mesenchymal stem cells. Cell Prolif 2012; 45:311-9. [PMID: 22571453 DOI: 10.1111/j.1365-2184.2012.00823.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Accepted: 03/08/2012] [Indexed: 01/07/2023] Open
Abstract
OBJECTIVES Adipose tissue engineering is one of the hottest topics in the field of regenerative medicine. Fat tissue has been considered as an abundant and accessible source of adult stem cells by tissue engineers, since it gives rise to adipose stem cells. However, recent reports have pointed out that adipose tissue, as a secretory and endocrine organ, might secrete cytokines that regulate body functions such as metabolism, infammation and more. In this study, we aim to investigate the adipogenic-inducing factors secreted by fat tissue. MATERIALS AND METHODS Conditioned medium were collected by culturing fat tissue fragments in plastic flasks. Mesenchymal stem cells (MSCs) cultured in conditioned medium (CM) to test the adipogenic-inducing factors. Oil red O staining, reverse transcription/polymerase chain reaction and immunocytofluorescent staining were performed to examine the differentiation of MSCs in CM. RESULTS MSCs cultured in CM of adipose tissue spontaneously differentiated into adipocytes. Furthermore, supplementation of insulin or dexamethasone to CM accelerated the process of lipid accumulation of differentiated MSCs. DISCUSSION Results from this study demonstrated that fat tissues secrete small molecules, which induce adipogenic differentiation of MSCs. CONCLUSIONS Our study provides clues for improving adipose tissue engineering by using fragmented adipose tissue as sources of fat-inducing factors.
Collapse
|
159
|
Konoshita T, Ichikawa M, Kimura T, Sato S, Fujii M, Makino Y, Wakahara S, Miyamori I, Svensson M, Cederholm J, Eliasson B, Zethelius B, Gudbjornsdottir S, Porrini E, Ruggenenti P, Motterlini N, Perna A, Parvanova Ilieva A, Petrov Iliev I, Dodesini AR, Bossi A, Sampietro G, Capitoni E, Gaspari F, Rubis N, Gherardi G, Ene-Iordache B, Remuzzi G, Tsuda A, Ishimura E, Ohno Y, Ichii M, Nakatani S, Mori K, Inaba M, Ge Y, Xie H, LI S, Jin B, Hou J, Zhang H, Shi M, Liu Z, Simone S, Cariello M, Vavallo A, Loverre A, Ranieri E, Battaglia M, Ditonno P, Gesualdo L, Grandaliano G, Pertosa G. Diabetes clinical studies. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
160
|
Kister I, Herbert J, Ge Y. Ultra-High-Field MR Imaging of Brain Lesions of Neuromyelitis Optica Spectrum Disorders (NMOsd): Absence of Central Venule within Lesions May Help Differentiate NMOsd from Multiple Sclerosis (P03.045). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p03.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
161
|
Zhang Y, Ge Y, Chen Y, Li Q, Chen J, Dong Y, Shi W. Cellular and molecular mechanisms of silibinin induces cell-cycle arrest and apoptosis on HeLa cells. Cell Biochem Funct 2011; 30:243-8. [PMID: 22170400 DOI: 10.1002/cbf.1842] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2011] [Revised: 11/15/2011] [Accepted: 11/16/2011] [Indexed: 01/12/2023]
Abstract
Silibinin, an effective anti-cancer and chemopreventive agent in various epithelial cancer models, has been reported to inhibit cancer cell growth through mitogenic signalling pathways including cervical cancer. However, the underlying mechanisms are still not well elucidated. Here, we assessed the effect of silibinin on human cervical carcinoma cell cycle modulation, apoptosis induction and associated molecular alterations by employing HeLa cell line. Silibinin treatment of HeLa cells resulted in a G2 arrest and induced a decrease in cyclin-dependent kinases involved in both G1 and G2 progression. In addition, silibinin showed a dose-dependent and a time-dependent apoptotic death in HeLa cells in both the mitochondrial pathway and the death receptor-mediated pathway, providing a strong rationale for future studies evaluating preventive and/or intervention strategies for silibinin in cervical cancer pre-clinical models.
Collapse
|
162
|
Raz E, Jensen JH, Ge Y, Babb JS, Miles L, Reaume J, Grossman RI, Inglese M. Brain iron quantification in mild traumatic brain injury: a magnetic field correlation study. AJNR Am J Neuroradiol 2011; 32:1851-6. [PMID: 21885717 DOI: 10.3174/ajnr.a2637] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Experimental studies have suggested a role for iron accumulation in the pathology of TBI. Magnetic field correlation MR imaging is sensitive to the presence of non-heme iron. The aims of this study are to 1) assess the presence, if any, and the extent of iron deposition in the deep gray matter and regional white matter of patients with mTBI by using MFC MR imaging; and 2) investigate the association of regional brain iron deposition with cognitive and behavioral performance of patients with mTBI. MATERIALS AND METHODS We prospectively enrolled 28 patients with mTBI. Eighteen healthy subjects served as controls. The subjects were administered the Stroop color word test, the Verbal Fluency Task, and the Post-Concussion Symptoms Scale. The MR imaging protocol (on a 3T imager) consisted of conventional brain imaging and MFC sequences. After the calculation of parametric maps, MFC was measured by using a region of interest approach. MFC values across groups were compared by using analysis of covariance, and the relationship of MFC values and neuropsychological tests were evaluated by using Spearman correlations. RESULTS Compared with controls, patients with mTBI demonstrated significant higher MFC values in the globus pallidus (P = .002) and in the thalamus (P = .036). In patients with mTBI, Stroop test scores were associated with the MFC value in frontal white matter (r = -0.38, P = .043). CONCLUSIONS MFC values were significantly elevated in the thalamus and globus pallidus of patients with mTBI, suggesting increased accumulation of iron. This supports the hypothesis that deep gray matter is a site of injury in mTBI and suggests a possible role for iron accumulation in the pathophysiological events after mTBI.
Collapse
|
163
|
Bruno M, Ge Y. Integrated proteomic approaches for understanding toxicity of environmental chemicals. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
164
|
Yuan L, Ge Y, Li T, Zhu X, Yin F, Wu Q. TH-E-BRB-05: Modeling the Correlation Between OAR Dose Sparing and Patientˈs Anatomy in Head and Neck IMRT. Med Phys 2011. [DOI: 10.1118/1.3613562] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
165
|
Zamorano L, Juan C, Fernández-Olmos A, Ge Y, Cantón R, Oliver A. Activity of the new cephalosporin CXA-101 (FR264205) against Pseudomonas aeruginosa isolates from chronically-infected cystic fibrosis patients. Clin Microbiol Infect 2011; 16:1482-7. [PMID: 20002107 DOI: 10.1111/j.1469-0691.2009.03130.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Chronic respiratory infection caused by Pseudomonas aeruginosa is the main driver of morbidity and mortality in cystic fibrosis (CF) patients. The development of resistance to all available antibiotics is a frequent outcome of these infections. The present study aimed to evaluate the activity of the new cephalosporin CXA-101 (FR264205) against a collection of 100 isolates obtained from 50 CF patients from two Spanish hospitals. The collection included the first (early) and the last (late) available isolate from each patient (average interval 68 ± 39 months). The MIC50 and MIC90 of CXA-101 were 0.5 and 2 mg/L and the geometric mean MIC was 0.7 mg/L; the MICs for 95% of the isolates were ≤8 mg/L (tentative breakpoint). Only meropenem yielded comparable results, although the MIC90 of this antibiotic was significantly higher (8 mg/L). CXA-101 showed conserved activity against a high proportion of isolates resistant to each of the antibiotics tested (ceftazidime, cefepime, piperacillin-tazobactam, imipenem, meropenem, levofloxacin and tobramycin), with MIC50 values of 1-2 mg/L. Moreover, CXA-101 retained good activity against multidrug-resistant strains, with MIC50 and MIC90 values of 2 and 16 mg/L. CXA-101 was also active against late CF isolates (the MIC for 96% was ≤8 mg/L); it was the only antibiotic tested to which a similar percentage of early and late isolates was susceptible. These results show that, despite a slight increase in MICs, major cross-resistance to CXA-101 did not develop during treatment of CF patients with the currently available antipseudomonal agents. Therefore, CXA-101 is envisaged as a valuable alternative for the treatment of chronic respiratory infection caused by P. aeruginosa in CF patients.
Collapse
|
166
|
Ge Y, Minta T, Kirkpatrick J, Yuan L, Wu Q. SU-E-T-23: Ontological Representation of Radiation Treatment Guidelines. Med Phys 2011. [DOI: 10.1118/1.3611973] [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
|
167
|
Yuan L, Ge Y, Li T, Zhu X, Yin F, Wu Q. SU-E-T-854: Key Anatomical Factors Influencing OAR Dose-Volume Distribution in Prostate IMRT Plans. Med Phys 2011. [DOI: 10.1118/1.3612818] [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
|
168
|
Ge Y, Liu J, Guo X, Han J. A follow-up study of early interceptive treatment of primary anterior crossbites. Eur J Orthod 2011; 33:551-7. [DOI: 10.1093/ejo/cjq120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
169
|
Zamorano L, Juan C, Fernández-Olmos A, Ge Y, Cantón R, Oliver A. Activity of the new cephalosporin CXA-101 (FR264205) against Pseudomonas aeruginosa isolates from chronically-infected cystic fibrosis patients. Clin Microbiol Infect 2010. [DOI: 10.1111/j.1469-0691.2010.03130.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
170
|
Zhang Z, Ge Y, Zhang D, Zhou X. High-content analysis in monastrol suppressor screens. A neural network-based classification approach. Methods Inf Med 2010; 50:265-72. [PMID: 20602002 DOI: 10.3414/me09-01-0030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2009] [Accepted: 03/22/2010] [Indexed: 11/09/2022]
Abstract
OBJECTIVES High-content screening (HCS) via automated fluorescent microscopy is a powerful technology for the effective expression of cellular processes. However, HCS will generally produce tremendous image datasets, which leads to difficulties of handling and analyzing. We proposed an automatic classification approach for simultaneous feature extraction and cell phenotype recognition of monoaster and bipolar cells in HCS system. METHODS The proposed approach was composed of image segmentation, feature extraction, and classification. The image segmentation was based on the Laplacian of Gaussian (LoG) edge detection method. For the reduction of noise effect on cellular images, we employed an adaptive threshold in microtubule channel. The principal component analysis was used in the feature selection process. The classification was performed with a back-propagation neural network (BPNN). Using the current approach, the cell phases were distinguished from three-channel acquisitions of cellular images and the numbers of bipolar and monoaster cells were automatically counted. RESULTS The validity of this approach was examined by the application of screening the response of drug compounds in suppressing Monastrol. Our results indicate that the proposed algorithm could improve the recognition rates of monoaster and bipolar cells to 97.98% and 93.12%, respectively, compared with 97.02% and 86.96% obtained from the same samples by multi-phenotypic mitotic analysis (MMA). CONCLUSIONS We have shown that BPNN is a valuable tool to classify cell phenotype. To further improve the classification performance, more test data, more optimized feature selection approaches, and advanced classifier may be required and will be investigated in future works.
Collapse
|
171
|
Zhu X, Li T, Thongphiew D, Ge Y, Yin F, Wu Q. TU-E-BRB-03: A Planning Quality Evaluation Tool for Adaptive IMRT Treatment Based on Machine Learning. Med Phys 2010. [DOI: 10.1118/1.3469286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
172
|
Ge Y, O'Shea T, Faddegon B. TU-B-BRA-02: X-Ray Plus Electron Radiotherapy with an Extendable MLC. Med Phys 2010. [DOI: 10.1118/1.3469186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
173
|
Wei Y, Ge Y, Zhou F, Chen H, Cui C, Liu D, Yang Z, Wu G, Gu J, Jiang J. Identification and characterization of the promoter of human ATF5 gene. J Biochem 2010; 148:171-8. [DOI: 10.1093/jb/mvq047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
174
|
Wang C, Zhang L, Yuan M, Ge Y, Liu Y, Fan J, Ruan Y, Cui Z, Tong S, Zhang S. The microfilament cytoskeleton plays a vital role in salt and osmotic stress tolerance in Arabidopsis. PLANT BIOLOGY (STUTTGART, GERMANY) 2010; 12:70-8. [PMID: 20653889 DOI: 10.1111/j.1438-8677.2009.00201.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Although recent studies have suggested that the microfilament (MF) cytoskeleton of plant cells participates in the response to salt stress, it remains unclear as to whether the MF cytoskeleton actually plays an active role in a plant's ability to withstand salt stress. In the present study, we report for the first time the role of MFs in salt tolerance of Arabidopsis thaliana. Our experiments revealed that Arabidopsis seedlings treated with 150 mm NaCl maintained MF assembly and bundle formation, whereas treatment with 250 mm NaCl initially induced MF assembly but subsequently caused MF disassembly. A corresponding change in the fluorescence intensity of MFs was also observed; that is, a sustained rise in fluorescence intensity in seedlings exposed to 150 mm NaCl and an initial rise and subsequent fall in seedlings exposed to 250 mm NaCl. These results suggest that MF assembly and bundles are induced early after salt stress treatment, while MF polymerization disappears after high salt stress. Facilitation of MF assembly with phalloidin rescued wild-type seedlings from death, whereas blocking MFs assembly with latrunculin A and cytochalasin D resulted in few survivors under salt stress. Pre-treatment of seedlings with phalloidin also clearly increased plant ability to withstand salt stress. MF assembly increased survival of Arabidopsis salt-sensitive sos2 mutants under salt stress and rescued defective sos2 mutants. Polymerization of MFs and its role in promoting survival was also found in plants exposed to osmotic stress. These findings suggest that the MF cytoskeleton participates and plays a vital role in responses to salt and osmotic stress in Arabidopsis.
Collapse
|
175
|
Larson Gedman A, Chen Q, Kugel Desmoulin S, Ge Y, LaFiura K, Haska CL, Cherian C, Devidas M, Linda SB, Taub JW, Matherly LH. The impact of NOTCH1, FBW7 and PTEN mutations on prognosis and downstream signaling in pediatric T-cell acute lymphoblastic leukemia: a report from the Children's Oncology Group. Leukemia 2009; 23:1417-25. [PMID: 19340001 PMCID: PMC2726275 DOI: 10.1038/leu.2009.64] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We explored the impact of mutations in the NOTCH1, FBW7 and PTEN genes on prognosis and downstream signaling in a well-defined cohort of 47 patients with pediatric T-cell acute lymphoblastic leukemia (T-ALL). In T-ALL lymphoblasts, we identified high-frequency mutations in NOTCH1 (n=16), FBW7 (n=5) and PTEN (n=26). NOTCH1 mutations resulted in 1.3- to 3.3-fold increased transactivation of an HES1 reporter construct over wild-type NOTCH1; mutant FBW7 resulted in further augmentation of reporter gene activity. NOTCH1 and FBW7 mutations were accompanied by increased median transcripts for NOTCH1 target genes (HES1, DELTEX1 and cMYC). However, none of these mutations were associated with treatment outcome. Elevated HES1, DELTEX1 and cMYC transcripts were associated with significant increases in transcript levels of several chemotherapy relevant genes, including MDR1, ABCC5, reduced folate carrier, asparagine synthetase, thiopurine methyltransferase, BCL2 and dihydrofolate reductase. PTEN transcripts positively correlated with HES1 and cMYC transcript levels. Our results suggest that (1) multiple factors should be considered with attempting to identify molecular-based prognostic factors for pediatric T-ALL, and (2) depending on the NOTCH1 signaling status, modifications in the types or dosing of standard chemotherapy drugs for T-ALL, or combinations of agents capable of targeting NOTCH1, AKT and/or mTOR with standard chemotherapy agents may be warranted.
Collapse
|