451
|
Carpenter CM, Rakow-Penner R, Jiang S, Pogue BW, Glover GH, Paulsen KD. Monitoring of hemodynamic changes induced in the healthy breast through inspired gas stimuli with MR-guided diffuse optical imaging. Med Phys 2010; 37:1638-46. [PMID: 20443485 DOI: 10.1118/1.3358123] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
PURPOSE The modulation of tissue hemodynamics has important clinical value in medicine for both tumor diagnosis and therapy. As an oncological tool, increasing tissue oxygenation via modulation of inspired gas has been proposed as a method to improve cancer therapy and determine radiation sensitivity. As a radiological tool, inducing changes in tissue total hemoglobin may provide a means to detect and characterize malignant tumors by providing information about tissue vascular function. The ability to change and measure tissue hemoglobin and oxygenation concentrations in the healthy breast during administration of three different types of modulated gas stimuli (oxygen/ carbogen, air/carbogen, and air/oxygen) was investigated. METHODS Subjects breathed combinations of gases which were modulated in time. MR-guided diffuse optical tomography measured total hemoglobin and oxygen saturation in the breast every 30 s during the 16 min breathing stimulus. Metrics of maximum correlation and phase lag were calculated by cross correlating the measured hemodynamics with the stimulus. These results were compared to an air/air control to determine the hemodynamic changes compared to the baseline physiology. RESULTS This study demonstrated that a gas stimulus consisting of alternating oxygen/carbogen induced the largest and most robust hemodynamic response in healthy breast parenchyma relative to the changes that occurred during the breathing of room air. This stimulus caused increases in total hemoglobin and oxygen saturation during the carbogen phase of gas inhalation, and decreases during the oxygen phase. These findings are consistent with the theory that oxygen acts as a vasoconstrictor, while carbogen acts as a vasodilator. However, difficulties in inducing a consistent change in tissue hemoglobin and oxygenation were observed because of variability in intersubject physiology, especially during the air/oxygen or air/carbogen modulated breathing protocols. CONCLUSIONS MR-guided diffuse optical imaging is a unique tool that can measure tissue hemodynamics in the breast during modulated breathing. This technique may have utility in determining the therapeutic potential of pretreatment tissue oxygenation or in investigating vascular function. Future gas modulation studies in the breast should use a combination of oxygen and carbogen as the functional stimulus. Additionally, control measures of subject physiology during air breathing are critical for robust measurements.
Collapse
|
452
|
Fluck O, Gu X, Men C, Choi D, Majumdar A, Jiang S. SU-GG-T-255: Development of a Computational Infrastructure for GPU-Based Online Adaptive Radiation Therapy. Med Phys 2010. [DOI: 10.1118/1.3468647] [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
|
453
|
Li R, Lewis J, Jia X, Zhao T, Lamb J, Yang D, Low D, Jiang S. SU-GG-J-93: PCA-Based Lung Motion Model. Med Phys 2010. [DOI: 10.1118/1.3468317] [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
|
454
|
Tian Z, Xun J, Yuan K, Jiang S. TU-B-201B-03: CT Reconstruction from Undersampled Projection Data Via Edge-Preserving Total Variation Regularization. Med Phys 2010. [DOI: 10.1118/1.3469199] [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
|
455
|
Cerviño L, Lawson J, Taylor M, Jiang S, Pawlicki T. SU-GG-T-526: Clinical Implementation of a Novel Frameless and Maskless Stereotactic Radiosurgery Treatment. Med Phys 2010. [DOI: 10.1118/1.3468923] [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
|
456
|
Jiang S, Gu X, Men C, Jia X, Fluck O, Choi D, Majumdar A. TH-C-BRA-05: Real-Time Re-planning for Online Adaptive Radiotherapy. Med Phys 2010. [DOI: 10.1118/1.3469484] [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
|
457
|
Park J, Park S, Kim J, Han Y, Cho M, Kim H, Liu Z, Jiang S, Song W. SU-GG-I-44: Ultra-Fast Digital Tomosynthesis Reconstruction Using CUDA Programming for Real-Time Image-Guided Radiation Therapy. Med Phys 2010. [DOI: 10.1118/1.3468077] [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
|
458
|
Gu X, Jelen U, Men C, Jia X, Jiang S. SU-GG-T-26: An Accurate and Efficient Finite-Size Pencil Beam Based Dose Calculation Engine for Online Adaptive IMRT Replanning. Med Phys 2010. [DOI: 10.1118/1.3468412] [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
|
459
|
Men C, Romeijn E, Jia X, Gu X, Jiang S. WE-B-BRA-01: GPU-Based Ultra Fast Direct Aperture Optimization in IMRT Treatment Planning. Med Phys 2010. [DOI: 10.1118/1.3469341] [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
|
460
|
Tian Z, Xun J, Jiang S. TU-D-204B-04: 4DCT Reconstruction from Undersampled Projections Using Edge-Preserving Total Variation and Non Local Means. Med Phys 2010. [DOI: 10.1118/1.3469262] [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
|
461
|
Li R, Jiang S. TU-D-204C-02: Machine Learning in Real-time Tumor Localization. Med Phys 2010. [DOI: 10.1118/1.3469269] [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
|
462
|
Lewis J, Li R, Jia X, Watkins W, Song W, Jiang S. TU-D-204B-03: Lung CBCT Motion Deblurring Using Tumor Tracking in Rotational Cone-Beam Projections. Med Phys 2010. [DOI: 10.1118/1.3469261] [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
|
463
|
Jia X, Lou Y, Li R, Lewis J, Gu X, Men C, Song W, Jiang S. TH-C-BRA-03: GPU-Based Cone Beam CT Reconstruction. Med Phys 2010. [DOI: 10.1118/1.3469482] [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
|
464
|
Li R, Jia X, Lewis J, Gu X, Folkerts M, Men C, Jiang S. WE-C-204B-05: Real-Time Volumetric Image Reconstruction and 3D Tumor Localization Based on a Single X-Ray Projection Image during Lung Cancer Radiotherapy. Med Phys 2010. [DOI: 10.1118/1.3469377] [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
|
465
|
Cerviño L, Du J, Jiang S. SU-GG-J-97: An MRI Study on the Use of External and Internal Surrogates for Lung Tumor Tracking. Med Phys 2010. [DOI: 10.1118/1.3468321] [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
|
466
|
Men C, Romeijn E, Jia X, Gu X, Liang Y, Jiang S. SU-GG-T-110: A Novel Aperture-Based Algorithm for Fast Treatment Plan Optimization of Volumetric Modulated Arc Therapy (VMAT). Med Phys 2010. [DOI: 10.1118/1.3468499] [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
|
467
|
Graf M, Scanderbeg D, Yashar C, Jiang S. SU-GG-T-37: Monte Carlo Dose Comparison Assessing Material Inhomogeneity Effects in Breast Brachytherapy. Med Phys 2010. [DOI: 10.1118/1.3468423] [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
|
468
|
Jiang Y, Gu X, Men C, Jia X, Li R, Lewis J, Jiang S. TU-E-BRB-05: Real-Time Dose Reconstruction for Treatment Monitoring. Med Phys 2010. [DOI: 10.1118/1.3469288] [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
|
469
|
Gu X, Nelson T, Men C, Jia X, Liang Y, Jiang S. TU-B-204B-03: Volumetric Ultrasound Guided Online Adaptive Partial Breast Irradiation. Med Phys 2010. [DOI: 10.1118/1.3469192] [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
|
470
|
Jiang S, Jiang Z, Zhou G, Chen Z, Li D. Non-phytate phosphorus requirements and efficacy of a genetically engineered yeast phytase in male Lingnan Yellow broilers from 1 to 21 days of age. J Anim Physiol Anim Nutr (Berl) 2010; 95:47-55. [PMID: 20487103 DOI: 10.1111/j.1439-0396.2009.00981.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This experiment was conducted to investigate the requirement of non-phytate phosphorus (nPP) and efficacy of a genetically engineered yeast phytase in performance and tibia characteristics by male Lingnan Yellow broilers from 1 to 21 days of age. A total of 2640 1-day-old male chicks were randomly allotted to one of 11 dietary treatments, which consisted of six replicate floor pens with 40 birds per pen. All treatments had the same levels of all nutrients except for phosphorus and phytase. The control group (treatment 1) was fed the basal diet without dicalcium phosphate or phytase supplementation. Dietary concentrations of nPP were 0.11%, 0.19%, 0.27%, 0.35%, 0.43%, 0.51% and 0.59% respectively for treatments 1, 2, 3, 4, 5, 6 and 7, through addition of dicalcium phosphate (chemistry grade) to the basal diet. Diets 8-11 were supplemented with a genetically engineered yeast phytase 250, 500, 750 U/kg and a commercial phytase product 500 U/kg in basal diet respectively. The results showed that 0.46% and 0.51% nPP were required for maximum body-weight gain and optimum tibia development indicators respectively. However, 0.59% nPP had a negative effect on bird growth. The equivalency value of the genetically engineered yeast phytase was estimated to be 874 U/kg to liberate 0.1% nPP.
Collapse
|
471
|
Jiang S, Yu Y, Venners SA, Zhang Y, Xing H, Wang X, Xu X. Effects of MTHFR and MS gene polymorphisms on baseline blood pressure and Benazepril effectiveness in Chinese hypertensive patients. J Hum Hypertens 2010; 25:172-7. [DOI: 10.1038/jhh.2010.50] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
472
|
Sun L, Jiang S, Marciante JR. All-fiber optical magnetic-field sensor based on Faraday rotation in highly terbium-doped fiber. OPTICS EXPRESS 2010; 18:5407-5412. [PMID: 20389556 DOI: 10.1364/oe.18.005407] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An all-fiber optical magnetic field sensor is demonstrated. It consists of a fiber Faraday rotator and a fiber polarizer. The fiber Faraday rotator uses a 2-cm-long section of 56-wt.%-terbium-doped silicate fiber with a Verdet constant of -24.5 rad/(Tm) at 1053 nm. The fiber polarizer is Corning SP1060 single-polarization fiber. The sensor has a sensitivity of 0.49 rad/T and can measure magnetic fields from 0.02 to 3.2 T.
Collapse
|
473
|
Sun L, Jiang S, Zuegel JD, Marciante JR. All-fiber optical isolator based on Faraday rotation in highly terbium-doped fiber. OPTICS LETTERS 2010; 35:706-708. [PMID: 20195326 DOI: 10.1364/ol.35.000706] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An all-fiber isolator with 17 dB optical isolation is demonstrated. The fiber Faraday rotator uses 56 wt. % terbium (Tb)-doped silicate fiber, and the fiber polarizers are Corning SP1060 single-polarization fiber. The effective Verdet constant of the Tb-doped fiber is measured to be -24.5+/-1.0 rad/(Tm) at 1053 nm, which is 20 times larger than silica fiber and 22% larger than previously reported results.
Collapse
|
474
|
Fu Y, Li S, Zu Y, Yang G, Yang Z, Luo M, Jiang S, Wink M, Efferth T. Medicinal chemistry of paclitaxel and its analogues. Curr Med Chem 2010; 16:3966-85. [PMID: 19747129 DOI: 10.2174/092986709789352277] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Accepted: 07/29/2009] [Indexed: 12/13/2022]
Abstract
Paclitaxel belongs to the most successful anticancer drugs developed and utilised during the past two decades. Nevertheless, the development of resistance of tumor cells and severe side effects in the patients require further improvement of the drug. In this review, we provide a detailed overview of the state-of-the-art in the medicinal chemistry of paclitaxel and its analogues. A number of strategies have been explored to obtain sufficient amounts of paclitaxel for clinical use from natural resources. Semi-synthesis from its precursor, 10-deacetylbaccatin III, which can be extracted from Taxus leavesturned out as the most appropriate method for commercial production. So far, many paclitaxel derivatives have been synthesized, and their effect on microtubules stabilization and cytotoxicity were investigated in terms of structure-activity relationships (SAR). One of them, docetaxel, was approved as a more potent anticancer agent than paclitaxel towards a variety of tumor types. This review summarizes current possibilities to harvest sufficient amount of drugs from natural sources, including the production of taxanes in bioreactors and synthetic approaches for paclitaxel and its analogues, their mechanism of action and structure-activity relationships. In addition, future developments and perspectives for this class of compounds are outlined.
Collapse
|
475
|
Su C, Picard P, Rathbone MP, Jiang S. Guanosine-induced decrease in side population of lung cancer cells: lack of correlation with ABCG2 expression. J BIOL REG HOMEOS AG 2010; 24:19-25. [PMID: 20385068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Cancers contain a 'side population' (SP), a subset of cells that is greatly enriched in stem cells and which contains malignant progenitors. SP cells are characterised by high efflux capability for Hoechst 33342 dye and for anti-cancer therapeutic agents through transporters; ABCG2 (ATP-binding cassette transporter G2) is currently most closely associated with the SP phenotype. Guanosine is an important intercellular signalling molecule; it stimulates stem cell proliferation in vivo and affects cholesterol efflux in vitro through activation of ABCG transporter (ABCG1), raising the possibility that it might also affect ABCG2 and hence the SP. We examined the effects of guanosine on the SP of A549 lung cancer cells. Fluorescence-activated cell sorting (FACS) revealed that exposure to 10 microM guanosine significantly decreased the proportion of SP cells after 48 hours but not after 6 hours. In contrast, Western blot analysis showed that 10 microM guanosine significantly decreased ABCG2 expression after 6 hours, but not after 48 hours. These data demonstrate that guanosine affects both the proportion of SP cells and ABCG2 transporters, but the lack of correlation between ABCG2 expression and the SP phenotype indicates that transporters other than ABCG2 are involved in maintaining the SP phenotype in A549 lung cancer cells.
Collapse
|