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1.
Nihon Hoshasen Gijutsu Gakkai Zasshi ; 74(12): 1434-1442, 2018 12.
Artículo en Japonés | MEDLINE | ID: mdl-30568094

RESUMEN

The present study grasped the radiation exposure per examination by incident air kerma (air kerma-area product; KAP and incident air kerma; Ka, e) using an air kerma-area product meter of our division with mobile population based gastric cancer screening. Initially, we measured the air kerma rate at the patient entrance reference point using an air kerma-area product meter and calibrated dosimeter, for three devices which an air kerma-area product meter was equipped, inspected the indication error of them. The error was 4.3% at the maximum, and accuracy was confirmed. The 816 patients who underwent gastric cancer screening in our division, the median values of KAP and Ka, e of the standard gastrography method 1 were 645.7 mGy·cm2, 37.4 mGy, respectively. The radiation dose of males were significantly higher than females, and the radiation dose increased in proportion to the BMI. The median values of calculated KAP and Ka, e of the standard gastrography method 1 for standard body size were 633.8 mGy·cm2, 37.0 mGy, respectively. We suggest that the patient exposure in gastrography can be optimized using an air kerma-area product meter.


Asunto(s)
Exposición a la Radiación , Neoplasias Gástricas , Femenino , Fluoroscopía , Humanos , Masculino , Dosis de Radiación , Dosímetros de Radiación , Neoplasias Gástricas/diagnóstico por imagen
2.
Magn Reson Med Sci ; 17(4): 331-337, 2018 Oct 10.
Artículo en Inglés | MEDLINE | ID: mdl-29526883

RESUMEN

PURPOSE: High Mobility Group Box1 (HMGB1), which is one of the damage-associated molecular pattern molecules relating to various inflammatory diseases, has gained interest as a therapeutic target because of its involvement in wound healing processes. In the present study, we investigated HMGB1 as a potential therapeutic target in a model of lung fibrosis using a preclinical hyperpolarized 129Xe (HPXe) MRI system. METHODS: Lung injury was induced by intra-peritoneal injection of bleomycin (BLM) in 19 mice. Three weeks post-injection (when fibrosis was confirmed histologically), administration of ethyl pyruvate (EP) and alogliptin (ALG), which are down- and up-regulators of HMGB1, respectively, was commenced in six and seven of the 19 mice, respectively, and continued for a further 3 weeks. A separate sham-instilled group was formed of five mice, which were administered with saline for 6 weeks. Over the second 3-week period, the effects of disease progression and pharmacological therapy in the four groups of mice were monitored by HPXe MRI metrics of fractional ventilation and gas-exchange function. RESULTS: Gas-exchange function in BLM mice was significantly reduced after 3 weeks of BLM challenge compared to sham-instilled mice (P < 0.05). Ethyl pyruvate was found to improve HPXe MRI metrics of both ventilation and gas exchange, and repair tissue damage (assessed histologically), to a similar level as sham-instilled mice (P < 0.05), whilst ALG treatment caused no significant improvement of pulmonary function. CONCLUSION: This study demonstrates the down-regulator of HMGB1, EP, as a potential therapeutic agent for pulmonary fibrosis, as assessed by a non-invasive HPXe MRI protocol.


Asunto(s)
Lesión Pulmonar , Pulmón , Imagen por Resonancia Magnética/métodos , Piruvatos/farmacología , Animales , Bleomicina/efectos adversos , Pulmón/diagnóstico por imagen , Pulmón/efectos de los fármacos , Lesión Pulmonar/inducido químicamente , Lesión Pulmonar/diagnóstico por imagen , Ratones , Piruvatos/administración & dosificación , Isótopos de Xenón/administración & dosificación
3.
Magn Reson Med ; 78(2): 721-729, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-27689918

RESUMEN

PURPOSE: The purpose of this work was to investigate disease progression and treatment response in a murine model of chronic obstructive pulmonary disease (COPD) using a preclinical hyperpolarized 129 Xe (HPXe) magnetic resonance imaging (MRI) strategy. METHODS: COPD phenotypes were induced in 32 mice by 10 weeks of exposure to cigarette smoke (CS) and lipopolysaccharide (LPS). Efficacy of ethyl pyruvate (EP), an anti-inflammatory drug, was investigated by administering EP to 16 of the 32 mice after 6 weeks of CS and LPS exposure. HPXe MRI was performed to monitor changes in pulmonary function during disease progression and pharmacological therapy. RESULTS: HPXe metrics of fractional ventilation and gas-exchange function were significantly reduced after 6 weeks of CS and LPS exposure compared to sham-instilled mice administered with saline (P < 0.05). After this observation, EP administration was started in 16 of the 32 mice and continued for 4 weeks. EP was found to improve HPXe MRI metrics to a similar level as in sham-instilled mice (P < 0.01). Histological analysis showed significant alveolar tissue destruction in the COPD group, but relatively normal alveolar structure in the EP and sham-instilled groups. CONCLUSION: This study demonstrates the potential efficacy of EP for COPD therapy, as assessed by a noninvasive, translatable 129 Xe MRI procedure. Magn Reson Med 78:721-729, 2017. © 2016 International Society for Magnetic Resonance in Medicine.


Asunto(s)
Antiinflamatorios/uso terapéutico , Imagen por Resonancia Magnética/métodos , Enfermedad Pulmonar Obstructiva Crónica , Piruvatos/uso terapéutico , Isótopos de Xenón/química , Animales , Procesamiento de Imagen Asistido por Computador/métodos , Masculino , Ratones , Enfermedad Pulmonar Obstructiva Crónica/diagnóstico por imagen , Enfermedad Pulmonar Obstructiva Crónica/tratamiento farmacológico
4.
NMR Biomed ; 29(10): 1414-9, 2016 10.
Artículo en Inglés | MEDLINE | ID: mdl-27526627

RESUMEN

The use of a quenching gas, isobutene, with a low vapor pressure was investigated to enhance the utility of hyperpolarized (129) Xe (HP Xe) MRI. Xenon mixed with isobutene was hyperpolarized using a home-built apparatus for continuously producing HP Xe. The isobutene was then readily liquefied and separated almost totally by continuous condensation at about 173 K, because the vapor pressure of isobutene (0.247 kPa) is much lower than that of Xe (157 kPa). Finally, the neat Xe gas was continuously delivered to mice by spontaneous inhalation. The HP Xe MRI was enhanced twofold in polarization level and threefold in signal intensity when isobutene was adopted as the quenching gas instead of N2 . The usefulness of the HP Xe MRI was verified by application to pulmonary functional imaging of spontaneously breathing mice, where the parameters of fractional ventilation (ra ) and gas exchange (fD ) were evaluated, aiming at future extension to preclinical studies. This is the first application of isobutene as a quenching gas for HP Xe MRI.


Asunto(s)
Alquenos/farmacocinética , Aumento de la Imagen/métodos , Pulmón/fisiología , Imagen por Resonancia Magnética/métodos , Intercambio Gaseoso Pulmonar/fisiología , Isótopos de Xenón/farmacocinética , Administración por Inhalación , Alquenos/administración & dosificación , Animales , Medios de Contraste , Gases , Interpretación de Imagen Asistida por Computador/métodos , Pulmón/diagnóstico por imagen , Masculino , Ratones , Ratones Endogámicos , Radiofármacos/administración & dosificación , Radiofármacos/farmacología , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Isótopos de Xenón/administración & dosificación
5.
Appl Biochem Biotechnol ; 102-103(1-6): 239-50, 2002.
Artículo en Inglés | MEDLINE | ID: mdl-12396127

RESUMEN

The arachidonate cascade includes the cyclooxygenase (COX) pathway to form prostanoids and the lipoxygenase (LOX) pathway to generate several oxygenated fatty acids, collectively called eicosanoids. Eicosanoids are suggested to play a dual role in regulating cell survival and apoptosis in various types of cells through an unknown mechanism. We found apoptosis in cultured Madin-Darby canine kidney (MDCK) cells treated with 12-O-tetradecanoylphorbol beta-acetate (TPA), a potent tumor promoter, and nordihydroguaiaretic acid (NDGA), a LOX inhibitor. The effect of TPA was synergistically stimulated along with NDGA. Aspirin, a COX inhibitor, was not effective. The target of NDGA might be different from the mechanism involving a LOX activity in some kinds of carcinoma cells because the increased expression of 12-LOX was not detected in MDCK cells treated with TPA. Caspase and poly(ADP-ribose) metabolites were found to be involved in the signal transduction pathway of the TPA- and NDGA-induced apoptosis in MDCK cells. Alternatively, hydrogen peroxide-induced apoptosis was not affected by NDGA. Thus, the TPA-induced response involved the mechanism independent of the oxidative stress. Obesity is a risk factor for severe diseases including noninsulin-dependent diabetes and atherosclerosis characterized by the changes of cell properties of adipocytes. We found that conjugated linolenic acid from bitter gourd was able to induce apoptosis in mouse preadipogenic 3T3-L1 cells. The findings provide the potential use of conjugated fatty acids to regulate obesity.


Asunto(s)
Apoptosis/fisiología , Ácido Araquidónico/metabolismo , Células 3T3 , Adipocitos/citología , Adipocitos/efectos de los fármacos , Animales , Apoptosis/efectos de los fármacos , Inhibidores de Caspasas , Células Cultivadas , Cromatina/efectos de los fármacos , Cromatina/fisiología , Cromatina/ultraestructura , Perros , Peróxido de Hidrógeno/farmacología , Lipooxigenasa/metabolismo , Inhibidores de la Lipooxigenasa/farmacología , Masoprocol/farmacología , Ratones , Prostaglandina-Endoperóxido Sintasas/metabolismo , ARN Mensajero/biosíntesis , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transducción de Señal/efectos de los fármacos , Acetato de Tetradecanoilforbol/química , Acetato de Tetradecanoilforbol/farmacología , Ácido alfa-Linolénico/química , Ácido alfa-Linolénico/farmacología
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