1
|
Ohara Y, Yoshimura Y, Fukuoka Y, Tanioka K, Yamamoto K. Correlation of left atrial strain with left ventricular end-diastolic pressure in patients with coronary artery disease and preserved left ventricular ejection faction. Eur Heart J Cardiovasc Imaging 2021. [DOI: 10.1093/ehjci/jeaa356.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Elevated left ventricular (LV) filling pressures are the main physiologic consequence of LV diastolic dysfunction. Left atrial (LA) strain was recently found useful to predict elevated LV filling pressures noninvasively. However, there are few reports on the role of LA strain when predicting LV filling pressure in patients with coronary artery disease (CAD). The aim of this study was to explore the correlation between LA strain and LV end-diastolic pressure (LVEDP) in patients with CAD and preserved LV ejection fraction.
Methods
Fifty-four patients with stable CAD were enrolled. Global atrial longitudinal strain was measured by averaging all atrial segments. Resorvoir (S-LAs), conduit (S-LAe), and contractile (S-LAa) phase strain were obtained. LVEDP was invasively obtained by left heart catheterization.
Results
Patients were divided into two groups: elevated LVEDP group (LVEDP > 15mmHg group: n = 23) and normal LVEDP group (LVEDP ≤ 15mmHg group: n = 31). Elevated LVEDP group showed significantly decreased S-LAs and S-LAa (S-LAs: 21.3 ± 7.2% vs. 27.5 ± 7.8%, p < 0.005; S-LAa: 9.7 ± 3.3% vs. 14.6 ± 3.4%, p < 0.0001). However, E/Ea and S-LAe were not significantly different between the two groups. LVEDP significantly correlated with S-LAa (r=-0.596, p < 0.0001) and S-LAs (r=-0.431, p < 0.001). Receiver operating characteristics curve analysis showed that S-LAa could predict elevated LVEDP (AUC = 0.84) and a cut-off value of S-LAa < 11.6% was able to most accurately identify patients with elevated LVEDP.
Conclusions
LA strain, especially S-LAa, provided additional diagnostic value for the noninvasive assessment of LV filling pressure in CAD patients with preserved LV ejection fraction.
Collapse
Affiliation(s)
- Y Ohara
- Kochi Health Sciences Center, Kochi, Japan
| | | | - Y Fukuoka
- Kochi Health Sciences Center, Kochi, Japan
| | - K Tanioka
- Kochi Health Sciences Center, Kochi, Japan
| | - K Yamamoto
- Kochi Health Sciences Center, Kochi, Japan
| |
Collapse
|
2
|
Castelnovo A, Ferri R, Tanioka K, Tachibana N, Carelli C, Riccitelli G, Zecca C, Gobbi C, Manconi M. 1122 Sleep Architecture and Leg Movement Activity During Sleep in Patients with Multiple Sclerosis. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.1117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
Although sleep in patients with Multiple Sclerosis (MS) has been investigated in several studies using subjective measures, objective sleep data collected using polysomnography (PSG) are still scanty and often divergent. We herein present the largest study to date evaluating sleep architecture and total leg movement activity during sleep (LMS) in patients with MS.
Methods
We collected PSG recordings from 80 patients affected by multiple sclerosis (MS, 48.1±10.61yo 67.5% females), and 60 age and gender matched healthy control subjects (HC, 48.5±17.20 yo, 56% females). Group differences were computed using non-parametric statistics for all traditional sleep architecture parameters, LMS, short-interval (SILMS), periodic (PLMS), isolated LMS (ISOLMS) indices and duration, inter-movement interval (IMI) graphs and time-of-night distribution of LMS.
Results
Patients with MS showed a significantly decreased total sleep period, an increased number of awakenings and stages shifts per hour of sleep, and an increased representation of stage 1 (min and %) compared to the HC group; 26 (32.5%) MS patients had PLMS ≥15/hour versus 8 (13.3%) HC subjects. On average, the comparison between MS and HC groups yielded significant results in terms of an increase in LMS, PLMS, SILMS and ISOLMS indices but not durations. Moreover, MS patients displayed a higher periodicity index, an increased PLMS activity at all inter-movement intervals considered and their PLMS time-of-night distribution revealed that the PLMS increase was stable over the course of the night.
Conclusion
Sleep continuity is significantly impaired in patients with MS. Moreover, MS patients also an increased total LMS activity, including PLMS, which may contribute to disrupt sleep continuity. A disinhibition of lower spinal network due to cervical or supraspinal MS lesions might be implicated in the mechanisms underlying this latter finding.
Support
The Employer Department of Neurology, Regional Hospital Lugano (EOC), Lugano, Switzerland receives financial support from Teva, Merck Serono, Biogen Idec, Bayer Schering, Genzyme, Roche and Novartis. The submitted work is not related to these agreements.
Collapse
Affiliation(s)
- A Castelnovo
- Sleep Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, SWITZERLAND
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, SWITZERLAND
| | - R Ferri
- Oasi Research Institute-IRCCS, Troina, ITALY
| | - K Tanioka
- Department of Neurology, Osaka City General Hospital, Osaka, JAPAN
| | - N Tachibana
- Division of Sleep Medicine, Kansai Electric Power Medical Research Institute, Osaka, JAPAN
| | - C Carelli
- Sleep Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, SWITZERLAND
| | - G Riccitelli
- Neuroimaging Research Unit, Institute of Experimental Neurology, Division of Neuroscience, Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Scientific Institute, Milan, ITALY
- Multiple Sclerosis Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, SWITZERLAND
| | - C Zecca
- Multiple Sclerosis Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, SWITZERLAND
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, SWITZERLAND
| | - C Gobbi
- Multiple Sclerosis Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, SWITZERLAND
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, SWITZERLAND
| | - M Manconi
- Sleep Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, SWITZERLAND
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, SWITZERLAND
| |
Collapse
|
3
|
Tanioka K, Hitomi T, Yoshimura H, Ono M, Nakao Y, Mase R, Kohara N, Kanda M, Takahashi R, Ikeda A. Evaluation of usefulness of remote electroencephalography reading system in Japan. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
4
|
Nishiyama K, Tanioka K, Azuma YT, Hayashi S, Fujimoto Y, Yoshida N, Kita S, Suzuki S, Nakajima H, Iwamoto T, Takeuchi T. Na +/Ca 2+ exchanger contributes to stool transport in mice with experimental diarrhea. J Vet Med Sci 2016; 79:403-411. [PMID: 27928109 PMCID: PMC5326949 DOI: 10.1292/jvms.16-0475] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The Na+/Ca2+ exchanger (NCX) is a bidirectional transporter that is
controlled by membrane potential and transmembrane gradients of Na+ and
Ca2+. To reveal the functional role of NCX on gastrointestinal motility, we
have previously used NCX1 and NCX2 heterozygote knockout mice (HET). We found that NCX1
and NCX2 play important roles in the motility of the gastric fundus, ileum and distal
colon. Therefore, we believed that NCX1 and NCX2 play an important role in transport of
intestinal contents. Here, we investigated the role of NCX in a mouse model of
drug-induced diarrhea. The fecal consistencies in NCX1 HET and NCX2 HET were assessed
using a diarrhea induced by magnesium sulfate, 5-hydroxytryptamine (5-HT) and
prostaglandin E2 (PGE2). NCX2 HET, but not NCX1 HET, exacerbated
magnesium sulfate-induced diarrhea by increasing watery fecals. Likewise, 5-HT-induced
diarrheas were exacerbated in NCX2 HET, but not NCX1 HET. However, NCX1 HET and NCX2 HET
demonstrated PGE2 induced diarrhea similar to those of wild-type mice (WT). As
well as the result of the distal colon shown previously, in the proximal and transverse
colons of WT, the myenteric plexus layers and the longitudinal and circular muscle layers
were strongly immunoreactive to NCX1 and NCX2. In this study, we demonstrate that NCX2 has
important roles in development of diarrhea.
Collapse
Affiliation(s)
- Kazuhiro Nishiyama
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, 1-58 Rinku-ohraikita, Izumisano, Osaka 598-8531, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Scheuermann J, Howansky A, Goldan A, Leveille S, Tousignant O, Tanioka K, Zhao W. MO-AB-BRA-07: Low Dose Imaging with Avalanche Amorphous Selenium Flat Panel Imager. Med Phys 2016. [DOI: 10.1118/1.4957159] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
6
|
Wronski M, Zhao W, Tanioka K, Decrescenzo G, Rowlands JA. Scintillator high-gain avalanche rushing photoconductor active-matrix flat panel imager: zero-spatial frequency x-ray imaging properties of the solid-state SHARP sensor structure. Med Phys 2013; 39:7102-9. [PMID: 23127101 DOI: 10.1118/1.4760989] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
PURPOSE The authors are investigating the feasibility of a new type of solid-state x-ray imaging sensor with programmable avalanche gain: scintillator high-gain avalanche rushing photoconductor active matrix flat panel imager (SHARP-AMFPI). The purpose of the present work is to investigate the inherent x-ray detection properties of SHARP and demonstrate its wide dynamic range through programmable gain. METHODS A distributed resistive layer (DRL) was developed to maintain stable avalanche gain operation in a solid-state HARP. The signal and noise properties of the HARP-DRL for optical photon detection were investigated as a function of avalanche gain both theoretically and experimentally, and the results were compared with HARP tube (with electron beam readout) used in previous investigations of zero spatial frequency performance of SHARP. For this new investigation, a solid-state SHARP x-ray image sensor was formed by direct optical coupling of the HARP-DRL with a structured cesium iodide (CsI) scintillator. The x-ray sensitivity of this sensor was measured as a function of avalanche gain and the results were compared with the sensitivity of HARP-DRL measured optically. The dynamic range of HARP-DRL with variable avalanche gain was investigated for the entire exposure range encountered in radiography∕fluoroscopy (R∕F) applications. RESULTS The signal from HARP-DRL as a function of electric field showed stable avalanche gain, and the noise associated with the avalanche process agrees well with theory and previous measurements from a HARP tube. This result indicates that when coupled with CsI for x-ray detection, the additional noise associated with avalanche gain in HARP-DRL is negligible. The x-ray sensitivity measurements using the SHARP sensor produced identical avalanche gain dependence on electric field as the optical measurements with HARP-DRL. Adjusting the avalanche multiplication gain in HARP-DRL enabled a very wide dynamic range which encompassed all clinically relevant medical x-ray exposures. CONCLUSIONS This work demonstrates that the HARP-DRL sensor enables the practical implementation of a SHARP solid-state x-ray sensor capable of quantum noise limited operation throughout the entire range of clinically relevant x-ray exposures. This is an important step toward the realization of a SHARP-AMFPI x-ray flat-panel imager.
Collapse
Affiliation(s)
- M Wronski
- Department of Radiation Oncology, Sunnybrook Health Sciences Center, Toronto, Ontario, Canada
| | | | | | | | | |
Collapse
|
7
|
Tsuji K, Ohshima T, Hirai T, Gotoh N, Tanioka K, Shidara K. Ultra-High-Sensitive Image Pickup Tubes Using Avalanche Multiplication in a-Se. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-219-507] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTExtremely high-sensitive image pickup tubes with sensitivities 1000 times higher than those of conventional tubes are fabricated using the avalanche phenomenon in a-Se as photoconductive targets. The excess avalanche noise of a video signal is found to be much less than that expected, based on the carrier ionization rates. The frequency spectra of the noise currents of both the pickup tubes and sandwich-type photocells are examined. The results are compared with those of a simulation, and it is found that the excess noise can be reduced by the charge-storage operation of imaging devices.
Collapse
|
8
|
Wronski MM, Zhao W, Reznik A, Tanioka K, DeCrescenzo G, Rowlands JA. A solid-state amorphous selenium avalanche technology for low photon flux imaging applications. Med Phys 2010; 37:4982-5. [PMID: 20964217 DOI: 10.1118/1.3483096] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
PURPOSE The feasibility of a practical solid-state technology for low photon flux imaging applications was investigated. The technology is based on an amorphous selenium photoreceptor with a voltage-controlled avalanche multiplication gain. If this photoreceptor can provide sufficient internal gain, it will be useful for an extensive range of diagnostic imaging systems. METHODS The avalanche photoreceptor under investigation is referred to as HARP-DRL. This is a novel concept in which a high-gain avalanche rushing photoconductor (HARP) is integrated with a distributed resistance layer (DRL) and sandwiched between two electrodes. The avalanche gain and leakage current characteristics of this photoreceptor were measured. RESULTS HARP-DRL has been found to sustain very high electric field strengths without electrical breakdown. It has shown avalanche multiplication gains as high as 10(4) and a very low leakage current (< or = 20 pA/mm2). CONCLUSIONS This is the first experimental demonstration of a solid-state amorphous photoreceptor which provides sufficient internal avalanche gain for photon counting and photon starved imaging applications.
Collapse
Affiliation(s)
- M M Wronski
- Department of Medical Biophysics, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario M4N 3M5, Canada.
| | | | | | | | | | | |
Collapse
|
9
|
Wronski M, Zhao W, Reznik A, Tanioka K, DeCrescenzo G, Rowlands J. SU-GG-BRC-06: An Enabling Technology for Very Low Exposure X-Ray Imaging. Med Phys 2009. [DOI: 10.1118/1.3182182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
10
|
Ishii M, Tanaka E, Imaizumi T, Sugio Y, Sekka T, Tanaka M, Yasuda M, Fukuyama N, Shinozaki Y, Hyodo K, Tanioka K, Mochizuki R, Kawai T, Mori H, Makuuchi H. Local VEGF administration enhances healing of colonic anastomoses in a rabbit model. Eur Surg Res 2009; 42:249-57. [PMID: 19346745 DOI: 10.1159/000210671] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Accepted: 02/10/2009] [Indexed: 12/12/2022]
Abstract
BACKGROUND/AIMS Many studies report the role of vascular endothelial growth factor (VEGF) in wound healing, but few describe local VEGF administration to the digestive tract. Leakage from colonic anastomoses, including those due to ischemia, represents a major complication causing increased mortality and morbidity. Angiogenesis is crucial to anastomotic healing and restoration of blood supply, and VEGF is a potent angiogenic factor showing improved healing in various models of reconstruction and anastomosis. Here, we examine the effects of local VEGF-A(165) administration on postoperative rabbit colon anastomosis. METHODS Two colotomies per animal were made in the sinistral colon on opposite sides of the mesentery. Randomly assigned VEGF (10 microg/0.1 ml) or saline (0.1 ml) was injected into the muscularis propria on both sides of each colonic anastomosis before closing the access laparotomy using single-layer sutures. On postoperative days 3, 4 and 7, the bursting pressure of partially healed anastomoses was measured. On postoperative day 4, anastomotic tissues were examined for the following: hydroxyproline; histopathologically for inflammatory infiltrate and tissue organization and immunohistochemically for capillary proliferation and density; vessel density of midzone collaterals around anastomoses by microangiography. RESULTS Compared to saline, VEGF administration significantly improved bursting pressure (p = 0.014, paired t test) and increased hydroxyproline (p = 0.027, paired t test) on postoperative day 4. Inflammatory cell infiltration and fibroblast proliferation were prominent, and submucosal capillary vascular counts were significantly higher for VEGF. CONCLUSIONS Administration of VEGF to colonic anastomosis accelerates wound healing and strengthens the anastomosis by increased angiogenesis.
Collapse
Affiliation(s)
- M Ishii
- Department of Surgery, Tokai University School of Medicine, Isehara, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Hirano K, Miyoshi T, Igarashi N, Takeda T, Wu J, Lwin TT, Kubota M, Egami N, Tanioka K, Kawai T, Wakatsuki S. X-ray phase imaging of biological soft tissue using a direct-sensing x-ray HARP tube camera. Phys Med Biol 2007; 52:2545-52. [PMID: 17440251 DOI: 10.1088/0031-9155/52/9/014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A HDTV camera having a direct-sensing x-ray high-gain avalanche rushing amorphous photoconductor (HARP) tube was used, for the first time, to acquire x-ray phase maps. The tube can achieve a high sensitivity as a result of the avalanche multiplication process in the HARP target. A beryllium plate, rather than a glass plate, was used as the face plate of the tube to minimize the loss of x-rays due to absorption, and a 15 microm thick HARP target was directly formed on it. In the experiment, the x-ray phase shifts produced by a rat liver were measured using synchrotron x-rays (lambda = 0.0766 nm) and a triple Laue-case (LLL) x-ray interferometer. Interference patterns produced by the sample were observed with the direct-sensing x-ray HARP tube camera. A voltage of 1300 V was applied to the HARP target to give an output signal gain of two. The camera was operated in 1125 scanning-line mode, and real-time images were stored on a workstation at a rate of 30 images/s with an image format of 960 (H) x 1100 (V) pixels. A phase-map image of the sample was successfully obtained using the fringe scanning method and phase unwrapping. The observed phase shifts ranged from 50 degrees to 200 degrees . Trees of blood vessels in the rat liver were clearly depicted without using a contrast agent. The spatial resolution of the x-ray camera was estimated to be better than 35 microm in the vertical direction and 100 microm in the horizontal direction.
Collapse
Affiliation(s)
- K Hirano
- Photon Factory, National Laboratory for High Energy Physics, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Lui BJM, Hunt DC, Reznik A, Tanioka K, Rowlands JA. X-ray imaging with amorphous selenium: Pulse height measurements of avalanche gain fluctuations. Med Phys 2006; 33:3183-92. [PMID: 17022211 DOI: 10.1118/1.2335491] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Avalanche multiplication in amorphous selenium (a-Se) can provide a large, adjustable gain for active matrix flat panel imagers (AMFPI), enabling quantum noise limited x-ray imaging during both radiography and fluoroscopy. In the case of direct conversion AMFPI, the multiplication factor for each x ray is a function of its depth of interaction, and the resulting variations in gain can reduce the detective quantum efficiency (DQE) of the system. An experimental method was developed to measure gain fluctuations by analyzing images of individual x rays that were obtained using a video camera with an a-Se target operated in avalanche mode. Pulse height spectra (PHS) of the charge produced per x ray were recorded for monoenergetic 30.9, 49.4, and 73.8 keV x-ray sources. The rapid initial decay and long tail of each PHS can be explained by a model in which positive charge dominates the initiation of avalanche. The Swank information factor quantifies the effect of gain fluctuation on DQE and was calculated from the PHS. The information factor was found to be 0.5 for a 25 microm a-Se layer with a maximum gain of approximately 300. Changing the energy of the incident x ray influenced the range of the primary photoelectron and noticeably affected the tail of the experimental PHS, but did not significantly change the avalanche Swank factor.
Collapse
Affiliation(s)
- Brian J M Lui
- Sunnybrook Health Sciences Centre, Imaging Research, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada.
| | | | | | | | | |
Collapse
|
13
|
Hunt D, Tanioka K, Rowlands J. Sci-Fri PM Imaging-03: Avalanche multiplication in diagnostic x-ray imaging. Med Phys 2006. [DOI: 10.1118/1.2244678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
14
|
Dohgomori H, Nagata S, Tanioka K, Kawanishi A, Kanai J, Kanemaru R. Crit Care 2006; 10:P363. [DOI: 10.1186/cc4710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
15
|
Li D, Zhao W, Tanioka K, Pang G, Rowlands JA. TH-C-I-611-08: A New Concept of Indirect Flat-Panel Detector with Avalanche Gain: SAPHIRE (Scitillator Avalanche Photoconductor with High Resolution Emitter Readout). Med Phys 2005. [DOI: 10.1118/1.1998643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
16
|
Abstract
OBJECT Thymidine phosphorylase (TP) and vascular endothelial growth factor (VEGF) are known angiogenic factors; however, there are few reports in which the relationship between these two factors is addressed. The authors compared expression patterns of TP and VEGF and investigated their role in the angiogenesis of glioblastoma multiforme (GBM). METHODS Surgical specimens from 41 cases of GBM were immunohistochemically stained for TP, VEGF, CD68 (a macrophage marker), and CD31 (an endothelial cell marker). Both TP labeling indices and VEGF immunoreactivity displayed significant correlations with vascular density. Although VEGF was diffusely distributed in the tumor, TP was strongly expressed around blood vessels and in vascular proliferation. Double labeling for TP and CD68 in 10 cases indicated that cells that reacted strongly positive for TP were almost always macrophages, and only small numbers of CD68-negative cells weakly expressed TP. The TP messenger (m)RNA expression was investigated using reverse transcription-polymerase chain reaction in six GBMs. All six specimens expressed TP mRNA. In addition, TP mRNA was detected in two of three groups of cultured GBM cells derived from surgical specimens. Macrophages, the production of which was induced from two volunteers' peripheral blood monocytes by applying macrophage colony-stimulating factor, also expressed TP mRNA. The glioma cell lines U251MG and U87MG, which barely express TP mRNA under normal conditions, expressed TP mRNA in response to interferon-beta stimulation or while in an anoxic condition. CONCLUSIONS Although it is feasible that GBM cells can express TP depending on their growing conditions, the majority of TP-expressing cells present in GBMs appear to be infiltrating macrophages. Coexistence of VEGF and TP may indicate a synergistic upregulation for angiogenesis because VEGF exerts a chemotactic activity on macrophages that express TP.
Collapse
Affiliation(s)
- H Hirano
- Department of Neurosurgery, and Institute for Cancer Research, Faculty of Medicine, Kagoshima University, Japan.
| | | | | | | | | |
Collapse
|
17
|
Tanioka K, Takeshima H, Hirano H, Kimura T, Nagata S, Akiyama S, Kuratsu J. Biological role of thymidine phosphorylase in human astrocytic tumors. Oncol Rep 2001; 8:491-6. [PMID: 11295068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
Thymidine phosphorylase (TP) has strong angiogenic activity and is overexpressed in a wide variety of malignant tumors. To elucidate the role of TP in human astrocytic tumors, we immunohistochemically investigated the expression of TP in 62 astrocytic tumors (12 astrocytomas, 12 anaplastic astrocytomas and 38 glioblastomas). Fifty-five astrocytic tumors (88.7%) were immunopositive for TP. The level of TP-expression was significantly correlated with the malignancy grade of astrocytic tumors; most of malignant gliomas highly expressed TP, while a small number of cells were positive in low grade astrocytomas (p < 0.001). Using double-immunostaining, we clarified that TP-expression was predominantly detectable in macrophages. There was no significant correlation between MIB-1 labeling index and TP-expression. However, TP-expression and the microvessel density were well correlated. These suggest that TP, mainly produced by the infiltrated macrophages, may play an important role in the progression of astrocytic tumors via neovascularization. Inhibitor of TP may represent a therapeutic modality for treating malignant gliomas.
Collapse
Affiliation(s)
- K Tanioka
- Department of Neurosurgery, Faculty of Medicine, Kagoshima University, Kagoshima 890-8520, Japan.
| | | | | | | | | | | | | |
Collapse
|
18
|
Yamanaka S, Yamasaki F, Seo H, Furuno T, Hashimoto T, Seki S, Kondo F, Morimoto K, Tanioka K, Hamashige N, Owaki T, Fujinaga H, Sugiura T, Doi Y. Influence of weather and age on the incidence of acute myocardial infarction. Pharmacotherapy 2000. [DOI: 10.1016/s0753-3322(01)90012-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
19
|
Sekka T, Volchikhina SA, Tanaka A, Hasegawa M, Tanaka Y, Ohtani Y, Tajima T, Makuuchi H, Tanaka E, Iwata Y, Sato S, Hyodo K, Ando M, Umetani K, Kubota M, Tanioka K, Mori H. Visualization, quantification and therapeutic evaluation of angiogenic vessels in cancer by synchrotron microangiography. J Synchrotron Radiat 2000; 7:361-7. [PMID: 16609222 DOI: 10.1107/s0909049500010967] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2000] [Accepted: 08/07/2000] [Indexed: 05/08/2023]
Abstract
The usefulness of a synchrotron microangiography system for depicting, quantitating and therapeutically evaluating angiogenic vessels in cancer is illustrated. In 20 mice transplanted with murine colon cancer, sequential changes in the angiogenic vessels were determined by using synchrotron microangiography, using changes in tumor volume for reference. This system allowed the depiction and quantification of angiogenic vessels in the period from one to four weeks after transplantation. The effects of antiangiogenic therapy were evaluated by using a neutralizing antibody against vascular endothelial growth factor. The neutralizing antibody partially suppressed angiogenesis and tumor growth. Synchrotron microangiography is shown to be useful for the depiction, quantification and evaluation of angiogenic vessels in cancer.
Collapse
Affiliation(s)
- T Sekka
- Department of Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Miyake K, Ota I, Miyake S, Tanioka K, Kubota M, Mochizuki R. Application of a newly developed, highly sensitive camera and a 3-dimensional high-definition television system in experimental ophthalmic surgeries. Arch Ophthalmol 1999; 117:1623-9. [PMID: 10604667 DOI: 10.1001/archopht.117.12.1623] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVE To apply a new television system, which displays highly sensitive, high-quality 3-dimensional (3-D) images, in performing experimental ophthalmic surgeries. METHODS By combining a high-gain avalanche rushing-amorphous photoconductor (HARP) camera, recently developed in Japan, which has 600 times greater sensitivity than conventional television cameras, and a single-camera, 3-D high-definition television system, which displays high-quality 3-D images, we performed cataract/intraocular lens surgeries and pars plana vitrectomies under various illumination intensities in pig cadaver eyes. RESULTS Cataract/intraocular lens surgeries were performed using 7.3% the intensity of ordinary surgical microscopic illumination; vitrectomies were performed using 30.2% the intensity of an ordinary endoillumination probe with the HARP camera and by observing the stereoscopic display of the single-camera 3-D high-definition television system. Images identical to those observed by the surgeon were displayed on the stereoscopic display monitor. CONCLUSION The system not only allowed surgeries to be performed under lower intensities of operating light but also provided real-time, highly sensitive 3-D images identical to those observed by the surgeon; thus, the device may be effectively used for education, team surgery, and telesurgery. CLINICAL RELEVANCE The new television system for ocular surgeries to be performed under lower intensities of operating light as well as providing real-time, highly sensitive 3-D images identical to those observed by the surgeon may be effectively used for education and telesurgery.
Collapse
Affiliation(s)
- K Miyake
- Shohzankai Medical Foundation, Miyake Eye Hospital, Nagoya, Japan.
| | | | | | | | | | | |
Collapse
|
21
|
Tanaka A, Mori H, Tanaka E, Mohammed MU, Tanaka Y, Sekka T, Ito K, Shinozaki Y, Hyodo K, Ando M, Umetani K, Tanioka K, Kubota M, Abe S, Handa S, Nakazawa H. Branching patterns of intramural coronary vessels determined by microangiography using synchrotron radiation. Am J Physiol 1999; 276:H2262-7. [PMID: 10362710 DOI: 10.1152/ajpheart.1999.276.6.h2262] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The intramural coronary artery (IMCA) with a diameter of 50-500 micrometers is critical for blood supply to the inner layers of heart muscle. We introduced digital measurement to microangiography using monochromatic synchrotron radiation and quantified branching patterns of the IMCA, the epicardial coronary artery (EPCA), and the distal ileal artery (DIA). The pre- and postbranching diameters were measured (95-1,275 micrometers) in seven dogs. A typical arterial segment divided into two nearly equivalent branches, and a regression line of daughter-to-mother diameter plots was almost identical among the EPCA (y = 0.838x - 16.7 in micrometers), IMCA (y = 0.737x - 2.18), and DIA (y = 0.755x + 8.63). However, a considerable difference was present at a segment where a proximal IMCA branched off from an EPCA (y = 0.182x + 90.2). Moreover, a proximal IMCA diameter had no relationship to the branching order from an EPCA. The precision of this method was confirmed by the good correlation of diameter measurements between two independent observers (r = 0.999, y = 1.02x - 1.07). In conclusion, using digital microangiography we demonstrated that the self-similar branching pattern of coronary arteries was discrete at the connection between the IMCA and EPCA.
Collapse
Affiliation(s)
- A Tanaka
- Departments of Physiology, General Surgery, Plastic Surgery, and Cardiology, Tokai University School of Medicine, Isehara 259-1193, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Mori H, Tanaka E, Hyodo K, Uddin Mohammed M, Sekka T, Ito K, Shinozaki Y, Tanaka A, Nakazawa H, Abe S, Handa S, Kubota M, Tanioka K, Umetani K, Ando M. Synchrotron microangiography reveals configurational changes and to-and-fro flow in intramyocardial vessels. Am J Physiol 1999; 276:H429-37. [PMID: 9950842 DOI: 10.1152/ajpheart.1999.276.2.h429] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In 8 dogs, in situ microangiography using synchrotron radiation visualized penetrating transmural arteries (PTAs) with a diameter of >60 micrometers and allowed quantitation of vessel diameters of >140 micrometers. Myocardial contraction reduced the vascular short-axial diameters to 87 +/- 17% (n = 62, P < 0.001, paired t-test) of the end-diastolic values and increased the longitudinal dimension to 129 +/- 5% (n = 45, P < 0.001). The diameter reduction in the subendocardial PTA segments was significantly more marked than that in the subepicardial PTA segments (60 +/- 12 vs. 88 +/- 12%, n=13, P < 0.001, paired t-test). Intracoronary administration of dobutamine (0.1 micrograms. kg-1. min-1) increased, and in contrast, partial clamping of the coronary artery (ischemia) decreased, the configurational changes. To-and-fro blood flow was clearly observed in PTAs with visual identification of capacitive backflow, resistive forward flow during ischemia on coronary arteriography, and even under baseline conditions in coronary venography. Thus this method advances our understanding of mechanical influences on the coronary circulation.
Collapse
Affiliation(s)
- H Mori
- Departments of Physiology, Internal Medicine, and Surgery, Tokai University School of Medicine, Isehara 259-1193, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Takeshita S, Isshiki T, Mori H, Tanaka E, Eto K, Miyazawa Y, Tanaka A, Shinozaki Y, Hyodo K, Ando M, Kubota M, Tanioka K, Umetani K, Ochiai M, Sato T, Miyashita H. Use of synchrotron radiation microangiography to assess development of small collateral arteries in a rat model of hindlimb ischemia. Circulation 1997; 95:805-8. [PMID: 9054734 DOI: 10.1161/01.cir.95.4.805] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND Current methods of angiography cannot provide images of arteries measuring < 200 microns in diameter. We have recently developed a new angiography system that uses monochromatic synchrotron radiation and a high-definition video system with a spatial resolution of 30 microns. In the present study, we applied this microangiography system to visualize small arteries in normal and ischemic rat limbs and investigated the development of collateral arteries. METHODS AND RESULTS Microangiography was performed in the normal and the ischemic limb 4 weeks after the excision of the femoral artery. In the normal limb, up to the fourth branches of the iliac and/or femoral arteries (diameter < 100 microns) were readily identified. Some of these branches were found to perfuse the distal thigh area. In the ischemic limb, an extensive structural remodeling of the vascular network was observed. Numerous small arteries had developed from the branches of the iliac artery to constitute a fine arterial network, the so-called "midzone," which was composed of linear, normal appearing arteries and those with an undulating, unbranched appearance. CONCLUSIONS The small collateral artery network was angiographically visualized with a resolution limit < 100 microns. The linear collaterals appeared to result from an opening of preexisting vessels. The undulating, unbranched vessels were not observed in the normal limbs and seemed to be vessels that were newly formed after limb ischemia. Synchrotron radiation microangiography appears to be a powerful means of assessing the development of small collateral arteries, which may help to provide a basis for understanding of the collateral circulation.
Collapse
Affiliation(s)
- S Takeshita
- Second Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Mori H, Hyodo K, Tanaka E, Uddin-Mohammed M, Yamakawa A, Shinozaki Y, Nakazawa H, Tanaka Y, Sekka T, Iwata Y, Handa S, Umetani K, Ueki H, Yokoyama T, Tanioka K, Kubota M, Hosaka H, Ishikawa N, Ando M. Small-vessel radiography in situ with monochromatic synchrotron radiation. Radiology 1996; 201:173-7. [PMID: 8816540 DOI: 10.1148/radiology.201.1.8816540] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
PURPOSE To evaluate the usefulness of a radiographic system with monochromatic synchrotron radiation to depict small vessels and peripheral secretory ducts. MATERIALS AND METHODS Radiography of various organs was tested in 14 anesthetized dogs and pancreatography was performed in an excised human pancreas by using the following system: monochromatic synchrotron radiation with an energy level just above the k absorption edge of iodine as an x-ray source and a high-definition TV system with a high-light-sensitivity image pick-up tube camera coupled with a fluorescent screen as a detector. RESULTS This system allowed depiction of small vessels (diameter < 50-100 microns) of the heart (penetrating transmural artery), brain (perforating arteries that arise directly in the circle of Willis), and intestinal organs (vasa recta and their submucosal communications) and of small branches (down to the fifth order) of the pancreatic duct. CONCLUSION The synchrotron radiation system may be useful for evaluating microcirculatory disorders and early-stage malignant tumors in various human organs.
Collapse
Affiliation(s)
- H Mori
- Department of Physiology, Tokai University School of Medicine, Isehara, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Nishi Y, Oguri K, Ohinata H, Tanioka K, Kita Y, Ninomiya N. Compressive-stress-induced Tc increase of the low-Tc Bi1.6Pb0.4Sr2Ca2Cu3Ox phase. Phys Rev B Condens Matter 1990; 41:6520-6523. [PMID: 9992897 DOI: 10.1103/physrevb.41.6520] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
26
|
|
27
|
Azar PM, Kitagawa H, Fukunishi A, Yasuda T, Oki M, Saji H, Tanioka K, Hosoi T. Uneventful transfusion of Jr(a+) red cells in the presence of anti-Jra. ACTA ACUST UNITED AC 1988. [DOI: 10.3925/jjtc1958.34.406] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
28
|
Tanioka K, Yamazaki J, Shidara K, Taketoshi K, Kawamura T, Hirai T, Takasaki Y. Avalanche-mode Amorphous Selenium Photoconductive Target for Camera Tube. Photo-Electronic Image Devices - Proceedings of the Ninth Symposium 1988. [DOI: 10.1016/s0065-2539(08)60476-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
29
|
Abstract
Two consecutive pregnancies at risk for Tay-Sachs disease with heat-labile beta-hexosaminidase B were monitored. Differential isozyme detection of beta-hexosaminidase in cell free amniotic fluid by DEAE cellulose column chromatography and cellulose acetate paper electrophoresis showed an affected fetus in the first pregnancy and an unaffected in the second. These results were confirmed in the aborted fetus and in a newborn baby, respectively.
Collapse
|
30
|
Tanioka K, Matsubayashi K, Shimada A. [Use of small primates as experimental animals]. Jikken Dobutsu 1979; 28:217-24. [PMID: 107034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
31
|
|
32
|
Tanioka K. [Psychiatric hospitals and nursing education]. Kango Kyoiku 1977; 18:533-7. [PMID: 243053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
33
|
Tanioka K. [Comment by the teaching staff of the seminar for training nursing instructors. A program designed to produce meaningful results]. Kango Kyoiku 1977; 18:436-8. [PMID: 587194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
34
|
Yamamoto S, Tanioka K. [Usefulness of marmoset in the field of biomedical science]. Jikken Dobutsu 1977; 26:169-72. [PMID: 407091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
35
|
Nakao Y, Tsuruzawa M, Kanaoka H, Tanioka K, Sudo M. [Cushing's syndrome caused by ACTH-producing carcinoid tumor originating in the duodenum]. Horumon To Rinsho 1975; 23:603-7. [PMID: 168020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|