451
|
Majeed Y, Agarwal AK, Naylor J, Seymour VAL, Jiang S, Muraki K, Fishwick CWG, Beech DJ. Cis-isomerism and other chemical requirements of steroidal agonists and partial agonists acting at TRPM3 channels. Br J Pharmacol 2011; 161:430-41. [PMID: 20735426 DOI: 10.1111/j.1476-5381.2010.00892.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND AND PURPOSE The transient receptor potential melastatin-3 (TRPM3) channel forms calcium-permeable, non-selective, cationic channels that are stimulated by pregnenolone sulphate (PregS). Here, we aimed to define chemical requirements of this acute steroid action and potentially reveal novel stimulators with physiological relevance. EXPERIMENTAL APPROACH We used TRPM3 channels over-expressed in HEK 293 cells, with intracellular calcium measurement and whole-cell patch-clamp recording techniques. KEY RESULTS The stimulation of TRPM3 channels was confined to PregS and closely related steroids and not mimicked by other major classes of steroids, including progesterone. Relatively potent stimulation of TRPM3-dependent calcium entry was observed. A sulphate group positioned at ring A was important for strong stimulation but more striking was the requirement for a cis (beta) configuration of the side group, revealing previously unrecognized stereo-selectivity and supporting existence of a specific binding site. A cis-oriented side group on ring A was not the only feature necessary for high activity because loss of the double bond in ring B reduced potency and loss of the acetyl group at ring D reduced efficacy and potency. Weak steroid stimulators of TRPM3 channels inhibited effects of PregS, suggesting partial agonism. In silico screening of chemical libraries for non-steroid modulators of TRPM3 channels revealed the importance of the steroid backbone for stimulatory effects. CONCLUSIONS AND IMPLICATIONS Our data defined some of the chemical requirements for acute stimulation of TRPM3 channels by steroids, supporting the existence of a specific and unique steroid binding site. Epipregnanolone sulphate was identified as a novel TRPM3 channel stimulator.
Collapse
|
452
|
Wang P, Jiang S, Cui Y, Yue Z, Su C, Sun J, Sheng S, Tian J. The n-terminal 5-MER peptide analogue P165 of amyloid precursor protein exerts protective effects on SH-SY5Y cells and rat hippocampus neuronal synapses. Neuroscience 2010; 173:169-78. [PMID: 21055450 DOI: 10.1016/j.neuroscience.2010.10.069] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 10/08/2010] [Accepted: 10/26/2010] [Indexed: 11/28/2022]
Abstract
The disturbance of the insulin-signaling pathway plays an important role in Alzheimer's disease. Resistance to insulin signaling renders neurons energy-deficient and vulnerable to oxidization or other metabolic insults and impairs synaptic plasticity. In search of neuroprotective drugs, we synthesized a peptide analogue, P165, an active domain of the soluble amyloid precursor protein, which is resistant to degradation and is suitable for oral administration in a clinical setting. Initially, we confirmed that P165 can protect cells from streptozotocin-caused damage and stimulate cell outgrowth using cultured SH-SY5Y cell lines treated with streptozotocin. P165 significantly reduced lactate dehydrogenase leakage from damaged cells, thereby rescuing cell energy production. Insulin signaling such as insulin receptor substrate-1 (IRS-1) and phosphoinositide 3-kinase (PI3K) proteins were upregulated to stimulate cell survival and growth. We proceeded to investigate the effect of P165 on streptozotocin-treated Alzheimer's disease (AD) rats. The data showed that P165 protected synaptic loss and dysfunction by increasing synaptophysin and PSD-95 (post synaptic density-95), while simultaneously decreasing α-synuclein expression. Moreover, animal behavior testing clearly showed that P165 increased rats' learning and memory activity. Overall, these results constitute evidence that peptide analogue 165 may protect synapse and improve learning and memory ability in AD.
Collapse
|
453
|
Men C, Romeijn H, Jia X, Jiang S. An Efficient Algorithm for Volumetric Modulated Arc Therapy (VMAT) Treatment Plan Optimization. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1897] [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]
|
454
|
Yang KL, Lee SK, Lin CC, Jiang S, Chiu HM, Lin S, Chen YC, Jian YF, Chen MJ, Shyr MH, Lin CL, Lin PY. Identification of a novel HLA-A allele, A*11:60, in a Taiwanese family. Int J Immunogenet 2010; 38:167-9. [DOI: 10.1111/j.1744-313x.2010.00974.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
455
|
Yang KL, Lee SK, Chu CC, Lin CC, Jiang S, Chiu HM, Lin S, Chen YC, Chen MJ, Jian YF, Yang CF, Yang SY, Shyr MJ, Lin CL, Lin PY. An HLA-A*02:01-B*13:01-DRB1*14:01:03 haplotype conserved in Taiwanese and a possible close relationship between DRB1*14:01:03 and DRB1*14:54. Int J Immunogenet 2010; 38:69-71. [DOI: 10.1111/j.1744-313x.2010.00970.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
456
|
Jiang S, Hsu YH, Venners SA, Zhang Y, Xing H, Wang X, Xu X. Effects of protein coding polymorphisms in the kallikrein 1 gene on baseline blood pressure and antihypertensive response to irbesartan in Chinese hypertensive patients. J Hum Hypertens 2010; 25:327-33. [PMID: 20613781 DOI: 10.1038/jhh.2010.70] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The aim of this study was to determine the association between coding variants in the human tissue kallikrein 1 (KLK1) gene and baseline blood pressure (BP) and antihypertensive response to irbesartan treatment in Chinese hypertensive patients. A total of 1061 hypertensives were recruited and received daily oral dosage of 150 mg irbesartan for 4 weeks. Predose BPs, BPs and blood irbesartan concentrations at postdose on the 28th day were all measured. Common functional single-nucleotide polymorphisms (SNPs) in the KLK1 gene were genotyped. On the basis of the HapMap data of Han Chinese in the Beijing population, two non-synonymous polymorphisms with minor allele frequency>0.1, SNP rs5517 (Glu162Lys) and rs5516 (Gln121Glu), were selected. Those with GG genotype in the rs5516 locus had higher average baseline systolic BP (SBP) than CC subjects (β±s.e.: 5.0±2.3, P=0.033); and no associations of rs5517 with baseline BP (diastolic BP (DBP) and SBP) and BP responses, or rs5516 with baseline DBP and BP response were observed. In a haplotype-based association test for the KLK1 gene, the Haplo-special score analyses identified that haplotype AG was marginally associated with SBP response (specific score: 1.75 for P=0.08), but not with DBP response. We did not find any associations between haplotypes (GC and AC) and BP responses. The Haplo-GLM analyses showed that, compared with haplotype GC subjects, the subjects with haplotype AG had a marginally greater SBP response (adjusted β±s.e.: 1.81±0.97, P=0.06), but DBP response did not differ. This study suggests that rs5516 in the KLK1 gene may be involved in the development of essential hypertension and in the regulation of SBP-lowering response to irbesartan in Chinese hypertensives.
Collapse
|
457
|
Sun L, Jiang S, Marciante JR. Compact all-fiber optical Faraday components using 65-wt%-terbium-doped fiber with a record Verdet constant of -32 rad/(Tm). OPTICS EXPRESS 2010; 18:12191-12196. [PMID: 20588343 DOI: 10.1364/oe.18.012191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A compact all-fiber Faraday isolator and a Faraday mirror are demonstrated. At the core of each of these components is an all-fiber Faraday rotator made of a 4-cm-long, 65-wt%-terbium-doped silicate fiber. The effective Verdet constant of the terbium-doped fiber is measured to be -32 rad/(Tm), which is 27 x larger than that of silica fiber. This effective Verdet constant is the largest value measured to date in any fiber and is 83% of the Verdet constant of commercially available crystal used in bulk optics-based isolators. Combining the all-fiber Faraday rotator with fiber polarizers results in a fully fusion spliced all-fiber isolator whose isolation is measured to be 19 dB. Combining the all-fiber Faraday rotator with a fiber Bragg grating results in an all-fiber Faraday mirror that rotates the polarization state of the reflected light by 88 +/- 4 degrees .
Collapse
|
458
|
Jia X, Gu X, Sempau J, Choi D, Majumdar A, Jiang S. TH-D-BRB-09: Development of a GPU-Based Monte Carlo Dose Calculation Code for Coupled Electron-Photon Transport. Med Phys 2010. [DOI: 10.1118/1.3469545] [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
|
459
|
Jia X, Lou Y, Lewis J, Li R, Gu X, Men C, Song W, Jiang S. WE-E-201B-01: GPU-Based Fast Cone Beam CT Reconstruction from Undersampled and Noisy Projection Data Via Total Variation. Med Phys 2010. [DOI: 10.1118/1.3469447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
460
|
Folkerts M, Jia X, Gu X, Choi D, Majumdar A, Jiang S. MO-FF-A4-05: Implementation and Evaluation of Various DRR Algorithms on GPU. Med Phys 2010. [DOI: 10.1118/1.3469159] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
461
|
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
|
462
|
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
|
463
|
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
|
464
|
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
|
465
|
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
|
466
|
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
|
467
|
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
|
468
|
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
|
469
|
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
|
470
|
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
|
471
|
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
|
472
|
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
|
473
|
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
|
474
|
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
|
475
|
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
|