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Saigo Y, Sasase T, Tohma M, Uno K, Shinozaki Y, Maekawa T, Sano R, Miyajima K, Ohta T. High-cholesterol diet in combination with hydroxypropyl-beta-cyclodextrin induces NASH-like disorders in the liver of rats. Physiol Res 2023; 72:371-382. [PMID: 37449749 PMCID: PMC10668992 DOI: 10.33549/physiolres.934981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 02/22/2023] [Indexed: 08/26/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a general term for fatty liver disease not caused by viruses or alcohol. Fibrotic hepatitis, cirrhosis, and hepatocellular carcinoma can develop. The recent increase in NAFLD incidence worldwide has stimulated drug development efforts. However, there is still no approved treatment. This may be due in part to the fact that non-alcoholic steatohepatitis (NASH) pathogenesis is very complex, and its mechanisms are not well understood. Studies with animals are very important for understanding the pathogenesis. Due to the close association between the establishment of human NASH pathology and metabolic syndrome, several animal models have been reported, especially in the context of overnutrition. In this study, we investigated the induction of NASH-like pathology by enhancing cholesterol absorption through treatment with hydroxypropyl-beta-cyclodextrin (CDX). Female Sprague-Dawley rats were fed a normal diet with normal water (control group); a high-fat (60 kcal%), cholesterol (1.25 %), and cholic acid (0.5 %) diet with normal water (HFCC group); or HFCC diet with 2 % CDX water (HFCC+CDX group) for 16 weeks. Compared to the control group, the HFCC and HFCC+CDX groups showed increased blood levels of total cholesterol, aspartate aminotransferase, and alanine aminotransferase. At autopsy, parameters related to hepatic lipid synthesis, oxidative stress, inflammation, and fibrosis were elevated, suggesting the development of NAFLD/NASH. Elevated levels of endoplasmic reticulum stress-related genes were evident in the HFCC+CDX group. In the novel rat model, excessive cholesterol intake and accelerated absorption contributed to NAFLD/NASH pathogenesis.
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Affiliation(s)
- Y Saigo
- Biological/Pharmacological Research Laboratories, Takatsuki Research Center, Central Pharmaceutical Research Institute, Japan Tobacco Inc., Takatsuki, Osaka, Japan.
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2
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Shinozaki Y, Fukui K, Maekawa M, Toyoda K, Yoshiuchi H, Inagaki K, Uno K, Miyajima K, Ohta T. Unilateral nephrectomized SHR/NDmcr-cp rat shows a progressive decline of glomerular filtration with tubular interstitial lesions. Physiol Res 2023; 72:209-220. [PMID: 37159855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
In patients with diabetic kidney disease (DKD), the estimated glomerular filtration rate (eGFR) or creatinine clearance rate (Ccr) is always used as an index of decline in renal function. However, there are few animal models of DKD that could be used to evaluate renal function based on GFR or Ccr. For this reason, it is desirable to develop animal models to assess renal function, which could also be used for the evaluation of novel therapeutic agents for DKD. Therefore, we aimed to develop such animal model of DKD by using spontaneously hypertensive rat (SHR)/NDmcr-cp (cp/cp) rats with the characteristics of obese type 2 diabetes and metabolic syndrome. As a result, we have found that unilateral nephrectomy (UNx) caused a chronic Ccr decline, development of glomerular sclerosis, tubular lesions, and tubulointerstitial fibrosis, accompanied by renal anemia. Moreover, losartan-mixed diet suppressed the Ccr decline in UNx-performed SHR/NDmcr-cp rats (UNx-SHR/cp rats), with improvement in renal anemia and histopathological changes. These results suggest that UNx-SHR/cp rats could be used as a DKD model for evaluating the efficacy of therapeutic agents based on suppression of renal function decline.
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Affiliation(s)
- Y Shinozaki
- Laboratory of Animal Physiology and Functional Anatomy, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.
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3
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Sano R, Ishii Y, Yamanaka M, Yasui Y, Kemmochi Y, Kuroki F, Sugimoto M, Fukuda S, Sasase T, Miyajima K, Nakae D, Ohta T. Glomerular hyperfiltration with hyperglycemia in the spontaneously diabetic Torii (SDT) fatty rat, an obese type 2 diabetic model. Physiol Res 2021; 70:45-54. [PMID: 33453716 DOI: 10.33549/physiolres.934533] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Glomerular hyperfiltration is observed in an early stage of kidney diseases including diabetic nephropathy. A better understanding of pathophysiological changes in glomerular hyperfiltration is essential for development of new therapies to prevent kidney disease progression. In this study, we investigated glomerular changes including glomerular filtration rate (GFR) and glomerular size in the Spontaneously Diabetic Torii (SDT) fatty rat, an obese type 2 diabetic model, and we also evaluated pharmacological effects of the sodium glucose cotransporter 2 inhibitor dapagliflozin on the renal lesions. Dapagliflozin was administered to SDT fatty rats from 5 to 17 weeks of age. Blood and urinary biochemical parameters were periodically measured. GFR was determined by transdermal GFR monitor at 16 weeks of age and histopathological analysis was performed at 17 weeks of age. SDT fatty rat developed severe hyperglycemia and exhibited pathophysiological abnormalities in the kidney, such as an increased GFR, glomerular hypertrophy and tissue lesions. Dapagliflozin achieved good glycemic control during the experimental period, inhibited the increase in GFR, and improved histopathological abnormalities in tubules. These results suggest that the SDT fatty rat is a useful model for analyzing the pathogenesis of diabetic nephropathy during its early stage and dapagliflozin improves not only hyperglycemia but also glomerular hyperfiltration and tubule lesions in SDT fatty rat.
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Affiliation(s)
- R Sano
- Biological/Pharmacological Research Laboratories, Central Pharmaceutical Research Institute, Japan Tobacco Inc., Osaka, Japan.
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4
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Miyajima K, Urushida T, Ito K, Kin F, Okazaki A, Takashima Y, Watanabe T, Kawaguchi Y, Wakabayashi Y, Naruse Y, Maekawa Y. Usefulness of lead delivery catheter system for true right ventricular septal pacing. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0770] [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
Background
Right ventricular (RV) septal pacing is often selected to preserve a more physiologic ventricular activation. But the pacing leads are not always located in true septal wall, rather in hinge or free wall in some cases with the conventional stylet-guided lead implantation. In recent years, new guiding catheter systems has attracted attention as a solution to that problem.
Objective
The aim of this study is to investigate that true ventricular sepal pacing can be achieved by use of the new guiding catheter system for pacing lead.
Methods
We enrolled 198 patients who underwent RV septal lead implantation and computed tomography (CT) after pacemaker implantation. 16 cases were used delivery catheter (Delivery), and 182 cases were used stylet for targeting ventricular septum (Conventional). We analyzed the lead locations with CT, and evaluated capture thresholds, R-wave amplitudes, lead impedances and 12-lead electrocardiogram findings one month after implantation.
Results
All cases of delivery catheter group had true septal lead positions (Delivery; 100% vs Conventional; 44%, p<0.01). Capture thresholds and lead impedances had not significant differences between between two groups (0.65±0.15V vs 0.60±0.15V, p=0.21, 570±95Ω vs 595±107Ω, p=0.39, respectively). R-wave amplitudes were significantly higher in delivery catheter group (13.0±4.8mV vs 10±4.6mV, p<0.01). Paced QRS durations were shorter in delivery catheter group (128±16ms vs 150±21ms, p<0.01).
Conclusions
The delivery catheter system designated for pacing lead can contribute to select the true ventricular septal sites and to attain the more physiologic ventricular activation.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- K Miyajima
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - T Urushida
- Hamamatsu University School of Medicine, The Third Department of Internal Medicine, Hamamatsu, Japan
| | - K Ito
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - F Kin
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - A Okazaki
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Takashima
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - T Watanabe
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Kawaguchi
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Wakabayashi
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Naruse
- Hamamatsu University School of Medicine, The Third Department of Internal Medicine, Hamamatsu, Japan
| | - Y Maekawa
- Hamamatsu University School of Medicine, The Third Department of Internal Medicine, Hamamatsu, Japan
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5
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Ihdayhid AR, Motoyama S, Fujimoto S, Isa M, Nerlekar N, Kato E, Miyajima K, Comella A, Kamo Y, Sarai M, Kawai H, Arakita K, Hislop-Jambrich J, Cameron J, Ko B. P7 The impact of coronary calcification on diagnostic performance of workstation CT derived fractional flow reserve - a multicentre experience. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehz872.014] [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: 11/13/2022] Open
Abstract
Abstract
Background
On-site workstation based computed tomography derived fractional flow reserve (CT-FFR) is an emerging method to assess the vessel specific ischaemia in coronary artery disease (CAD). The impact of coronary calcification on its diagnostic performance is unknown.
Purpose
To evaluate the impact of coronary calcification on the diagnostic performance of reduced-order CT-FFR at detecting vessel specific ischaemia.
Methods
This is a retrospective pooled analysis of 141 patients with suspected CAD enrolled from 3 global centres who underwent CT-coronary angiography (CTA), onsite CT-FFR and invasive FFR. Coronary calcification was assessed by Agatston score (AS). The diagnostic performance of CT-FFR (≤0.8) and CTA (≥50%) in evaluation of vessel specific ischaemia (FFR ≤ 0.8) was assessed across AS quartiles (Q1-4). A comparison of diagnostic performance of the low to mid AS (Q1 to Q3) versus high AS (Q4) was performed.
Results
Mean age and median AS was 65.8 ± 9.9 and 327.3 (interquartile range = 78.5 – 798.1). Diagnostic accuracy, sensitivity and specificity of CT-FFR for low-mid AS (0-798) and high AS (799-4019) were 77.4% vs 82.9%; 78.9% vs 94.7%; 68.8% vs 76.5% respectively with no statistical difference between the two groups. The AUC for ischaemia of CT-FFR in low to mid AS was comparable with AUC in the high AS (0.76 [95% CI: 0.66-0.86] vs 0.84 [0.69-0.99]; P = 0.397). The AUC for ischemia for CT-FFR in both low to mid AS and high AS was significantly higher than for CTA (0.76 [0.66-0.86] vs 0.57 [0.50-0.64]; P = 0.003 and 0.84 [0.69-0.99] vs 0.48 [0.38-0.57]; P < 0.001 respectively).
Conclusion
On-site workstation CT-FFR demonstrated consistently high diagnostic performance in patients with high AS. Its diagnostic performance was superior when compared with significant stenosis assessment on CTA across all spectrum of Agatston scores.
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Affiliation(s)
- A R Ihdayhid
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - S Motoyama
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - S Fujimoto
- Juntendo University Graduate School of Medicine, Department of Cardiovascular Medicine, Tokyo, Japan
| | - M Isa
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - N Nerlekar
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - E Kato
- Juntendo University Graduate School of Medicine, Department of Cardiovascular Medicine, Tokyo, Japan
| | - K Miyajima
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - A Comella
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - Y Kamo
- Juntendo University Graduate School of Medicine, Department of Cardiovascular Medicine, Tokyo, Japan
| | - M Sarai
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - H Kawai
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - K Arakita
- Canon Medical Systems Japan, Otawara, Japan
| | | | - J Cameron
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - B Ko
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
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Hirase T, Koyama H, Nagata M, Ishihara J, Miyajima K. Carrier and spin dynamics of high-density exciton magnetic polarons in Cd 0.8Mn 0.2Te. J Phys Condens Matter 2019; 31:425403. [PMID: 31252415 DOI: 10.1088/1361-648x/ab2dc1] [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] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigated the carrier and spin dynamics of high-density exciton magnetic polarons (HD-EMPs) in Cd0.8Mn0.2Te based on the measurement of their time-resolved photoluminescence (PL) spectra and polarization states, and the utilization of photo-induced Faraday rotation techniques. The PL from the HD-EMPs were collected in a forward scattering configuration, and was observed as a pulsed emission of a few picoseconds duration, exhibiting a blue-shift with time evolution. The blue shift originated from the refractive-index dispersion of the sample. By excluding the influence of the refractive-index dispersion on the time profile, it was revealed that the ultra-short pulsed emission with a time width smaller than 1 ps was initially radiated with a time delay of ~2.4 ps after photoexcitation. From the results of time evolution of the polarization states, it is concluded that the exciton-Mn spin interactions occurs immediately after the excitation, which causes the Mn ion spins to align to follow the spin states of photoexcited excitons. The alignment of the Mn ion spins through the formation of the HD-EMPs was significantly faster than that of the localized EMP. On the other hand, the time evolution of the photo-induced Faraday rotation showed two decay components attributed to spin relaxations of the excitons and Mn ions within the HD-EMP. The observation of the Faraday rotation signal due to the Mn ion spins further confirms that these spins were aligned by the photo-excited spin-aligned excitons. Our findings suggest a novel mechanism for the effective optical control of spins in a semimagnetic semiconductor, which is associated with a multi-exciton system and its localized state.
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Affiliation(s)
- T Hirase
- Department of Applied Physics, Graduate School of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
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7
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Miyajima K, Motoyama S, Sarai M, Kawai H, Takahashi H, Muramatsu T, Naruse H, Ishii J, Ozaki Y. P6178The optimal point of CT-FFR measurement in comparison with invasive FFR. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0784] [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: 11/13/2022] Open
Abstract
Abstract
Background
Currently, invasive fractional flow reserve (FFR), has become a gold standard to select patients requiring revascularization. Coronary computed tomography angiography (CTA) -derived FFR (FFRCT/CT-FFR) can be used for the management of coronary artery disease, which would be a gatekeeper of invasive coronary angiography. In most of the previous report to evaluate the diagnostic performance of FFRCT/CT-FFR, FFRCT/CT-FFR value was measured at the same point as the invasive FFR. Clinically, FFRCT/CT-FFR should be measured without the information of invasive FFR. However, optimal measurement point for CT-FFR has not been established yet.
Purpose
To assess the optimal measurement point of CT-FFR in comparison with invasive FFR as a gold standard.
Methods
CTA images scanned at 70–99% of R-R interval with 320 slice CT were screened. In the de-novo lesions with invasive FFR data were included in this study. Since calcified lesions could affect CT-FFR value, severe calcified lesions on CTA were excluded from the analysis. The CT-FFR analysis was performed by 2 cardiologists blinded to the results of the invasive FFR using a standard desktop computer and dedicated software. CT-FFR values could be provided at any point from ostium of coronary artery to the distal with vessel diameter of 1.8mm. To determine the optimal point for measurement of CT-FFR, CT-FFR values were obtained at 3 points in each coronary artery; 1) at the same point as invasive FFR; 2) lowest CT-FFR at distal point of coronary artery; 3) at 2.0 cm distal to the lesion. The diagnostic performance at each point was compared with invasive FFR.
Results
Fifty vessels of 44 patients (average age 68 years, male were 32) were included. Average Agatston score was 279.4. There was significant correlation between CT-FFR at each point and invasive FFR. CT-FFR at the same point as invasive FFR showed the good correlation with invasive FFR (R=0.641, 95% CI= 0.041–0.127, p<0.0001). Compared to the lowest CT-FFR at distal (R=0.608, 95% CI= 0.069–0.160, p<0.0001), CT-FFR at 2.0 cm distal to the lesion (R=0.604, 95% CI= 0.007–0.061, p<0.0001) revealed better correlation with invasive FFR. Sensitivity, specificity, positive and negative predictive value at each point were 92.8 / 93.3 / 81.8; 75.0 / 57.1 / 94.2; 61.9 / 48.2 / 60.0; and 96.0 / 95.2 / 84.6, respectively. Diagnostic accuracy showed that CT-FFR at 2cm distal to the lesion (0.84) was similar to CT-FFR at the same point as invasive FFR (0.80), and it was better than far distal (0.68) to detect invasive FFR derived ischemia.
Conclusions
CT-FFR was feasible to detect invasive FFR derived ischemia at the same point.
CT-FFR at 2.0 cm distal to the lesion showed higher diagnostic performance compared with CT-FFR measured at the far distal. CT-FFR measurement at 2.0 cm distal to the lesion would be a optimal position clinically.
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Affiliation(s)
- K Miyajima
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - S Motoyama
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - M Sarai
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - H Kawai
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - H Takahashi
- Fujita Health University, Division of Medical Statistics, Toyoake, Japan
| | - T Muramatsu
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - H Naruse
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - J Ishii
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University, Department of Cardiology, Toyoake, Japan
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8
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Ihdayhid AR, Fujimoto S, Motoyama S, Comella A, Kato E, Miyajima K, Isa M, Kamo Y, Sarai M, Kawai H, Arakita K, Hislop-Jambrich J, Cameron J, Seneviratne S, Ko B. P6187Multicentre diagnostic performance of on-site workstation CT derived fractional flow reserve. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0793] [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: 11/13/2022] Open
Abstract
Abstract
Background
On-site workstation based computed tomography derived fractional flow reserve (CT-FFR) is an emerging method to assess vessel specific ischaemia in coronary artery disease (CAD). Global data on its diagnostic performance when compared with CT coronary angiography (CTA) is limited.
Purpose
To evaluate the on-site multicentre diagnostic performance of reduced-order CT-FFR at detecting vessel specific ischaemia.
Method
This is a retrospective pooled analysis of 141 patients (204 vessels) with suspected CAD enrolled from 3 global centres who underwent CTA, onsite CT-FFR and invasive FFR. On-site CT-FFR was performed using a reduced order model on a standard desktop computer with dedicated software. The per vessel diagnostic performance of CT-FFR (≤0.8) for vessel specific ischemia (FFR≤0.8) was compared with CTA (≥50% stenosis).
Results
Mean age was 65.8±9.9, 70.7% were male. FFR significant stenosis was present in 34.3% (70/204) of vessels. Pearson correlation of CT-FFR for invasive FFR was 0.52, P<0.001. Bland Altman analysis demonstrated a mean difference of 0.06±0.15 (95% limits of agreement −0.22 to 0.35). Per vessel diagnostic accuracy, sensitivity and specificity of CT-FFR and CTA were 79.9% vs 53.5%; 78.6% vs 85.7%; 80.6% vs 35.9% respectively. Diagnostic performance as assessed by area under the receiver operator curve (AUC) for CT FFR was superior to CTA (0.82 [95% CI 0.76–0.88] vs 0.61 [0.55–0.67]; P<0.001).
Conclusion
On-site workstation CT-FFR demonstrated high per vessel diagnostic performance and was superior when compared with CTA in assessment of vessel specific ischaemia as assessed by invasive FFR in a multicentre setting.
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Affiliation(s)
- A R Ihdayhid
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - S Fujimoto
- Juntendo University Graduate School of Medicine, Department of Cardiovascular Medicine, Tokyo, Japan
| | - S Motoyama
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - A Comella
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - E Kato
- Juntendo University Graduate School of Medicine, Department of Cardiovascular Medicine, Tokyo, Japan
| | - K Miyajima
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - M Isa
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - Y Kamo
- Juntendo University Graduate School of Medicine, Department of Cardiovascular Medicine, Tokyo, Japan
| | - M Sarai
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - H Kawai
- Fujita Health University, Department of Cardiology, Fujita, Japan
| | - K Arakita
- Canon Medical Systems Japan, Otawara, Japan
| | | | - J Cameron
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - S Seneviratne
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
| | - B Ko
- Monash Cardiovascular Research Centre, Monash University and MonashHeart, Monash Health, Melbourne, Australia
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Kawai H, Motoyama S, Miyajima K, Hoshino M, Ohta M, Takahashi H, Ishii J, Muramatsu T, Sarai M, Ozaki Y. P6171Role of myocardial mass for identifying FFR-verified ischemia and determining therapeutic strategy. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0777] [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: 11/13/2022] Open
Abstract
Abstract
Background
Conventional noninvasive approach using coronary CT angiography (CTA) focusing on only coronary artery lesions remains mismatch in identifying functional ischemia and determining indication for coronary revascularization.
Purpose
We aimed to assess the usefulness of CT-verified myocardial mass for identifying FFR-verified myocardial ischemia and determining the indication of coronary revascularization after FFR examination.
Methods
We examined 244 vessels with intermediate stenoses (50 to 90% stenosis visually on CTA) in 216 patients (mean age 69.2±9.2, 166 men) who underwent both coronary CTA and invasive FFR. In addition to coronary stenosis severity and plaque characteristics on visual, minimal lumen diameter (MLD), minimal lumen area (MLA), plaque volume, the entire myocardial volume of the target vessel (MTV) and that exposed to ischemia (FFR ≤0.80) (myocardial volume of ischemia: MVI) were evaluated. Additionally, therapeutic strategy after FFR was recorded.
Results
Of 244 vessels, myocardial ischemia (FFR ≤0.80) was shown in 99 (40.6%). MTV was larger in the patients with FFR-verified ischemia than those without (53.3±19.2 vs. 41.5±21.6, P<0.001); MLA, plaque burden (PB) and percentage of aggregated plaque volume (%APV) were also associated with ischemia. The area under the curves (AUCs) of MLA, PB, %APV, and MTV were 0.69, 0.67, 0.64, and 0.71, respectively. Addition of MTV to a model with coronary stenosis on visual, MLA, PB, and %APV improved C-index (from 0.72 to 0.79, P<0.01), net reclassification improvement (NRI) (0.71, P<0.01), and integrated discrimination improvement (IDI) (0.10, P<0.01). Of 99 vessels with FFR ≤0.80, MVI was larger in the vessels with early revascularization after FFR than those without (38.8 vs. 29.1, P=0.01).
Conclusions
The measurement of myocardial mass improves the diagnostic performance of coronary CTA for the identification of coronary arteries with FFR-verified ischemia. Furthermore, it is associated with therapeutic strategy for the diseased vessels after FFR examination.
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Affiliation(s)
- H Kawai
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - S Motoyama
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - K Miyajima
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - M Hoshino
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - M Ohta
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - H Takahashi
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - J Ishii
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - T Muramatsu
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - M Sarai
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University, Department of Cardiology, Toyoake, Japan
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10
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Motoyama S, Sarai M, Kawai H, Miyajima K, Muramatsu T, Takahashi H, Naruse H, Ishii J, Ozaki Y. P2240CTA derived plaque characteristics and cardiac events in deferred lesions by invasive FFR. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0718] [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: 11/13/2022] Open
Abstract
Abstract
Background
Fractional flow reserve (FFR) based strategy for coronary artery disease (CAD) is widely accepted. However, cardiac events could occur at deferred lesions after FFR. We previous reported that CT derived high risk plaque (HRP) and residual stenosis were the independent predictors of cardiac events.
Purpose
The purpose of this study was to investigate if plaque characteristics on CTA could predict cardiac events in deferred lesions after FFR.
Methods
We included 211 vessels of 193 patients who were deferred revascularization after CTA and invasive FFR. The presence of HRP and the stenosis grading on CTA were analyzed.
Results
Median follow-up period after CTA was 623 days (IQR 302–945). HRP and obstructive stenosis were detected in 58 (27.5%) and 87 (41.2%) lesions, respectively. Cardiac events were occurred in 10 lesions at 440±167 days in average (range: 150–770 days). Multivaliate cox hazard regression analysis revealed that HRP (HR8.01, p=0.0032) and obstructive stenosis with ≥70% (HR 34.93, p<0.0001) were the independent predictors of cardiac events after adjusted for age, sex, and FFR≤0.8. Of 21 lesions with both HRP and obstructive stenosis, 29% lesions resulted in cardiac events in 2 years.
Conclusions
Even in the deferred lesions by invasive FFR, lesions with HRP and obstructive stenosis showed high rate of cardiac events. These lesions should be treated with intensive medical therapy to prevent cardiac events.
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Affiliation(s)
- S Motoyama
- Fujita Health University, Toyoake, Japan
| | - M Sarai
- Fujita Health University, Toyoake, Japan
| | - H Kawai
- Fujita Health University, Toyoake, Japan
| | - K Miyajima
- Fujita Health University, Toyoake, Japan
| | | | | | - H Naruse
- Fujita Health University, Toyoake, Japan
| | - J Ishii
- Fujita Health University, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University, Toyoake, Japan
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11
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Miyajima K, Shirai Y, Kin F, Watanabe T, Tatsuguchi M, Kawaguchi Y, Wakabayashi Y. P52714D-flow cardiac magnetic resonance analysis of left ventricular blood flow dynamics in mid-ventricular obstructive hypertrophic cardiomyopathy. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0242] [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: 11/13/2022] Open
Abstract
Abstract
Background
Mid-ventricular obstructive hypertrophic cardiomyopathy (MVO-HCM) has different blood flow dynamics from other phenotypes, but there are few detailed data on blood flow dynamics in the left ventricle.
Methods
4D-Flow MRI were performed at 1.5 T or 3 T with 9 MVO-HCM patients and 22 control patients (LVEF>50%, no wall motion abnormality). Myocardial infarction, severe valvular disease, HCM cases other than MVO were excluded. We calculated the cardiac function parameters and observed blood flow dynamics in the left ventricle using 4D-Flow MRI.
Results
LV mass was significantly higher in MVO-HCM group than in Control group (Control group; 73.3g vs MVO-HCM group; 109.5g, P=0.019). LVEF was higher in MVO-HCM group (Control group; 61.6% vs MVO-HCM group; 70.6%, P=0.026), but Stroke volume did not differ between the two groups (Control group; 68.8ml vs MVO-HCM group; 64.4ml, P=0.43).One or two vortices were observed in the left ventricle after opening the mitral valve. Two vortices were observed in 16 cases (72.7%) in the control group and 9 cases (100%) in the MVO-HCM group. Two vortices were formed on the anterior side and the posterior side. Blood flow pattern in which the vortex on the posterior side was formed to be the same size or larger than the vortex on the anterior side was observed only in the MVO-HCM group (Control group; 0% vs MVO-HCM group; 66.7%, P<0.001).
Streamline of MVO-HCM & Control
Conclusion
Characteristic blood flow patterns in the left ventricle of the MVO-HCM were revealed by using 4D-MRI. We thought that blood flow collides with the left ventricle wall due to the marked hypertrophy in the mid-ventricle, and normal vortex ring can not be formed in the MVO-HCM cases.
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Affiliation(s)
- K Miyajima
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Shirai
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - F Kin
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - T Watanabe
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - M Tatsuguchi
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Kawaguchi
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
| | - Y Wakabayashi
- Seirei Mikatahara General Hospital, Cardiology, Hamamatsu, Japan
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12
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Miyajima K, Motoyama S, Sarai M, Kawai H, Nagahara Y, Miyagi M, Takada K, Matsumoto R, Ito K, Takahashi H, Muramatsu T, Naruse H, Ishii J, Kondo T, Ozaki Y. 3281Clinical usefulness of CT-FFR and myocardial perfusion imaging in comparison with invasive FFR. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.3281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- K Miyajima
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - S Motoyama
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - M Sarai
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - H Kawai
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - Y Nagahara
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - M Miyagi
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - K Takada
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - R Matsumoto
- Fujita Health University, Department of Radiology, Toyoake, Japan
| | - K Ito
- Fujita Health University, Department of Radiology, Toyoake, Japan
| | - H Takahashi
- Fujita Health University, Division of Medical Statistics, Toyoake, Japan
| | - T Muramatsu
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - H Naruse
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - J Ishii
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - T Kondo
- Fujita Health University, Department of Cardiology, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University, Department of Cardiology, Toyoake, Japan
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13
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Kawai H, Ohta M, Motoyama S, Hashimoto Y, Nagahara Y, Hoshino M, Miyajima K, Ishikawa M, Okumura M, Naruse H, Takahashi H, Ishii J, Muramatsu T, Sarai M, Ozaki Y. 6182Does myocardial bridge assessed by coronary CT angiography predict vasospasm of left anterior descending? Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.6182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Kawai
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - M Ohta
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - S Motoyama
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - Y Hashimoto
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - Y Nagahara
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - M Hoshino
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - K Miyajima
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - M Ishikawa
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - M Okumura
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - H Naruse
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - H Takahashi
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - J Ishii
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - T Muramatsu
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - M Sarai
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
| | - Y Ozaki
- Department of Cardiology, Fujita Health University Hospital, Toyoake, Japan
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14
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Toriniwa Y, Muramatsu M, Ishii Y, Riya E, Miyajima K, Ohshida S, Kitatani K, Takekoshi S, Matsui T, Kume S, Yamada T, Ohta T. Pathophysiological characteristics of non-alcoholic steatohepatitis-like changes in cholesterol-loaded type 2 diabetic rats. Physiol Res 2018; 67:601-612. [PMID: 29750881 DOI: 10.33549/physiolres.933784] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Spontaneously Diabetic Torii (SDT) fatty rats, a new obese diabetic model, reportedly presented with features of non-alcoholic steatohepatitis (NASH) after 32 weeks of age. We tried to accelerate the onset of NASH in SDT fatty rats using dietary cholesterol loading and noticed changes in the blood choline level which is expected to be a NASH biomarker. Body weight and biochemical parameters were measured from 8 to 24 weeks of age. At 16, 20, 24 weeks, pathophysiological analysis of the livers were performed. Hepatic lipids, lipid peroxides, and the expression of mRNA related to triglyceride (TG) synthesis, inflammation, and fibrosis were evaluated at 24 weeks. Hepatic fibrosis was observed in SDT fatty rats fed cholesterol-enriched diets (SDT fatty-Cho) from 16 weeks. Furthermore, hepatic lipids and lipid peroxide were significantly higher in SDT fatty-Cho than SDT fatty rats fed normal diets at 24 weeks. Hepatic mRNA expression related to TG secretion decreased in SDT fatty-Cho, and the mRNA expression related to inflammation and fibrosis increased in SDT fatty-Cho at 24 weeks. Furthermore, SDT fatty-Cho presented with increased plasma choline, similar to human NASH. There were no significant changes in the effects of feeding a cholesterol-enriched diet in Sprague-Dawley rats. SDT fatty-Cho has the potential to become a valuable animal model for NASH associated with type 2 diabetes and obesity.
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Affiliation(s)
- Y Toriniwa
- Central Pharmaceutical Research Institute, Japan Tobacco Inc., Osaka, Japan.
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15
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Miyajima K, Motoyama S, Sarai M, Kondo T, Kawai H, Nagahara Y, Miyagi M, Takada K, Takahashi H, Muramatsu T, Naruse H, Ishii J, Ozaki Y. P5127On-site assessment of CT-FFR- in comparison with myocardial perfusion imaging and invasive FFR. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5127] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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16
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Kawai H, Motoyama S, Nagahara Y, Miyagi M, Miyajima K, Ito H, Takahashi H, Ishii J, Sarai M, Ozaki Y. 2185Is myocardial bridging based on coronary CTA associated with chest symptoms in the real world? Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.2185] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Saito T, Muramatsu M, Ishii Y, Saigo Y, Konuma T, Toriniwa Y, Miyajima K, Ohta T. Pathophysiological analysis of the progression of hepatic lesions in STAM mice. Physiol Res 2017; 66:791-799. [PMID: 28730823 DOI: 10.33549/physiolres.933592] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Nonalcoholic steatohepatitis (NASH) is a current health issue since the disease often leads to hepatocellular carcinoma; however, the pathogenesis of the disease has still not been fully elucidated. In this study, we investigated the pathophysiological changes observed in hepatic lesions in STAM mice, a novel NASH model. STAM mice, high fat-diet (HFD) fed mice, and streptozotocin (STZ) treated mice were prepared, and changes over time, such as biological parameters, mRNA expression, and histopathological findings, were evaluated once animal reached 5, 7, and 10 weeks of age. STZ mice presented with hyperglycemia and an increase in oxidative stress in immunohistochemical analyses of Hexanoyl-lysine: HEL from 5 weeks, with fibrosis in the liver also being observed from 5 weeks. HFD mice presented with hyperinsulinemia from 7 weeks and the slight hepatosteatosis was observed at 5 weeks, with changes significantly increasing until 10 weeks. STAM mice at 10 weeks showed significant hepatic changes, including hepatosteatosis, hypertrophic hepatocytes, and fibrosis, indicating pathological changes associated with NASH. These results suggested that the increase in oxidative stress with hyperglycemia triggered hepatic lesions in STAM mice, and insulin resistance promoted lesion formation with hepatic lipid accumulation. STAM mice may be a useful model for elucidating the pathogenesis of NASH with diabetes.
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Affiliation(s)
- T Saito
- Biological/Pharmacological Research Laboratories, Central Pharmaceutical Research Institute, Japan Tobacco Inc., Takatsuki, Osaka, Japan.
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18
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Kato H, Kato Y, Yoneyama R, Ishikawa R, Kojika M, Miyajima K, Takizawa N, Furukawa K. Review of PDT for lung cancer and future. Photodiagnosis Photodyn Ther 2017. [DOI: 10.1016/j.pdpdt.2017.01.067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Miyajima K, Toriniwa Y, Motohashi Y, Ishii Y, Shinohara M, Yamashiro H, Yamada T, Ohta T. Effect of Isolation Stress on Glucose/Lipid Metabolism in Spontaneously Diabetic Torii (SDT) Fatty Rats. ACTA ACUST UNITED AC 2015. [DOI: 10.9734/bjmmr/2015/17988] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Suzuki M, Toyooka S, Shivapurkar N, Shigematsu H, Miyajima K, Takahashi T, Stastny V, Zern AL, Fujisawa T, Pass HI, Carbone M, Gazdar AF. Retraction Note: Aberrant methylation profile of human malignant mesotheliomas and its relationship to SV40 infection. Oncogene 2014; 33:2814. [DOI: 10.1038/onc.2014.100] [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: 11/09/2022]
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21
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Nagashima F, Kitamura H, Miyajima K, Takasu A, Kasuga A, Furuse J, Onaya H, Ogawa A. Planning for Community-Based Coorperation at Kyorin University Hospital by Diagnostic Imaging and Comprehensive Assessment. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32335-8] [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: 10/25/2022] Open
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22
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Katayama K, Miyajima K, Ashida M, Itoh T. The photoexcited spin-aligned state of high-density exciton magnetic polarons and the effect of magnetic field in semimagnetic semiconductor Cd(0.8)Mn(0.2)Te. J Phys Condens Matter 2012; 24:325801-6. [PMID: 22784987 DOI: 10.1088/0953-8984/24/32/325801] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In Cd(0.8)Mn(0.2)Te, nonlinear photoluminescence (PL) appears only when localized excitons are selectively excited to high-density states. Here, the effect of a magnetic field is compared between nonlinear PL and PL due to localized magnetic polarons. Nonlinear PL shows a shift towards lower energy under an applied magnetic field, whereas PL of a localized magnetic polaron band shows a slight shift towards higher energy. The experimental results support the hypothesis that the origin of the nonlinear PL is a spin-aligned state of high-density exciton magnetic polarons. In the spin-aligned state, most spins of electrons (holes) in many magnetic polarons point in the same direction. In this new high-density photoexcited state, the s, p-d exchange interaction between photoexcited electrons (holes) and magnetic ions plays an important role.
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Affiliation(s)
- K Katayama
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, 152-8551, Japan.
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23
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Saji H, Tsuboi M, Matsubayashi J, Miyajima K, Usuda J, Kajiwara N, Uchida O, Ohira T, Ikeda N. Clinical response of large cell neuroendocrine carcinoma of the lung to perioperative adjuvant chemotherapy. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e17505] [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: 11/20/2022] Open
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24
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Sasase T, Morinaga H, Abe T, Miyajima K, Ohta T, Shinohara M, Matsushita M, Kakehashi A. Protein kinase C beta inhibitor prevents diabetic peripheral neuropathy, but not histopathological abnormalities of retina in Spontaneously Diabetic Torii rat. Diabetes Obes Metab 2009; 11:1084-7. [PMID: 19614949 DOI: 10.1111/j.1463-1326.2009.01082.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [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: 11/29/2022]
Abstract
Spontaneously Diabetic Torii (SDT) rat shows severe ocular complications such as tractional retinal detachment. In the present study, effect of protein kinase C beta (PKCbeta) inhibitor JTT-010 was evaluated to clarify the involvement of PKCbeta in complications of SDT rat. SDT rats were administered JTT-010 (10 or 50 mg/kg/day) for 48 weeks. SDT rats showed delayed oscillatory potentials in electroretinogram. Delayed motor nerve conduction velocity, decreased coefficients of variation of R-R intervals in electrocardiogram and thermal hypoalgesia were also observed. These functional disorders were prevented by administration of JTT-010. Abnormal retinal vascular was formed and the optic disc was protruded in SDT rat; however, JTT-010 did not prevent these hyperglycaemia-induced retinal abnormalities. These findings indicate that PKCbeta is intimately involved in diabetic complications; however, it seems that other factor(s) are primary contributors to histopathological abnormalities in retina. Therefore, PKCbeta inhibitors require concurrent administration of antihyperglycaemic drugs to achieve maximum effect on diabetic complications.
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Affiliation(s)
- T Sasase
- Japan Tobacco, Central Pharmaceutical Research Institute, Biological/Pharmacological Research Laboratories, 1-1 Murasaki-cho, Takatsuki,Osaka, Japan.
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25
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Saji H, Tsuboi M, Miyajima K, Shimada Y, Ohira T, Ikeda N. Impact of number of resected and involved lymph nodes (LN) at the time of surgical resection on the survival of non-small cell lung cancer (NSCLC). J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.7514] [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: 11/20/2022] Open
Abstract
7514 Background: Total number of lymph-nodes has recently proven prognostic in early breast and colorectal cancer. In this study we retrospectively evaluated the prognostic impact of the number of resected and involved lymph-nodes on the survival of stage I-III NSCLC. Methods: A series of 928 consecutive NSCLC pts who underwent complete lobectomy, bilobectomy or pneumonectomy with lymph-nodes dissection from 1/2000 to 11/2007 at Tokyo Medical University was eligible. Log rank and Cox proportional hazard model was used to estimate survival rates and relative risks. Results: Demographics are as follows: median age: 65.0 (22–87yrs), sex: 547 males and 381 females, median follow-up time: 2.5 yrs, clinical stage: 765 stage I, 84 stage II and 76 stage III, histology: 684 adenocarcinoma, 182 squamous cell carcinoma, and 62 others, operation: 870 lobectomy, 42 bilobectomy and 16 pneumonectomy, mean number of resected LN: 15 (1–49), mean number of involved LN: 0.9 (0–22). We observed a statistically significant increasing trend in overall survival (OS) between 0–3 and 4 and more of number of involved LN (P<0.001). Although a significant increasing in OS of 0–9 of number of resected LN cases compared with 10 and more was observed in all stages (P=0.024), no significant differentiation was observed in clinical stage I cases. Conclusions: This data suggests that there is a significant decrease in OS with 10 and more number of resected LN examined at surgery in NSCLC pts. However, there is no significant different in stage I pts, which implies that selected LN sampling is enough in clinical stage I cases. Further study such as LN dissection vs LN sampling in clinical stage I will be needed. No significant financial relationships to disclose.
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Affiliation(s)
- H. Saji
- Tokyo Medical University, Tokyo, Japan
| | - M. Tsuboi
- Tokyo Medical University, Tokyo, Japan
| | | | | | - T. Ohira
- Tokyo Medical University, Tokyo, Japan
| | - N. Ikeda
- Tokyo Medical University, Tokyo, Japan
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26
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Miyajima K, Kagotani Y, Saito S, Ashida M, Itoh T. Superfluorescent pulsed emission from biexcitons in an ensemble of semiconductor quantum dots. J Phys Condens Matter 2009; 21:195802. [PMID: 21825497 DOI: 10.1088/0953-8984/21/19/195802] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Picosecond time-resolved photoluminescence from biexcitons in CuCl quantum dots (QDs) embedded in a NaCl matrix has been measured using an optical Kerr gate method. Ultrafast pulsed emission from the biexciton states was observed for the first time, only under resonant two-photon excitation of biexcitons. This implies that complete population inversion between the biexciton and exciton states is necessary in order to trigger the pulsed emission. In addition, the nature of the dependence of the time profiles of the pulsed emission on the excitation intensity reveals that the peak intensity is directly proportional to the square of the number of excited QDs. We conclude that this phenomenon is caused by superfluorescence, that is, the cooperative spontaneous radiative decay of many isolated excited states coupled by a resonant electromagnetic wave. Such a phenomenon has been observed for the first time in an ensemble of semiconductor QDs in this study. The results presented in this paper show that it is possible to control the microscopic coherent dynamics of electronic excited states in a QD ensemble.
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Affiliation(s)
- K Miyajima
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan. PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, Japan
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Ohara M, Miyajima K, Pramann A, Nakajima A, Kaya K. Geometric and Electronic Structures of Terbium−Silicon Mixed Clusters (TbSin; 6 ≤ n ≤ 16). J Phys Chem A 2007. [DOI: 10.1021/jp076626u] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Sasase T, Ohta T, Ogawa N, Miyajima K, Ito M, Yamamoto H, Morinaga H, Matsushita M. Preventive effects of glycaemic control on ocular complications of Spontaneously Diabetic Torii rat. Diabetes Obes Metab 2006; 8:501-7. [PMID: 16918584 DOI: 10.1111/j.1463-1326.2005.00535.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [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: 11/29/2022]
Abstract
AIM Spontaneously Diabetic Torii (SDT) rat is a new model of non-obese type 2 diabetes. SDT rats show severe ocular complications such as cataracts, tractional retinal detachment with fibrous proliferation and massive haemorrhaging in the anterior chamber. In the present study, blood glucose levels of SDT rats were controlled in order to examine whether these ocular complications are caused by hyperglycaemia. METHODS SDT rats were treated with an insulin implant to control blood glucose. To evaluate retinal function, we used electroretinograms (ERG) and measured vascular endothelial growth factor (VEGF) concentrations within the aqueous humour. Finally, we studied retinal flat-mounts and trypsin digestion to evaluate vascular abnormalities in SDT rats. RESULTS Forty-four-week-old SDT rats displayed an increase in VEGF concentrations within the aqueous humour and significant prolongation of the peak latencies in ERG (Sigma(OP(1)-OP(4)); Sprague-Dawley (SD): 146.2 +/- 1.06 ms; SDT: 166.3 +/- 2.38 ms; SDT + insulin: 149.2 +/- 1.83 ms). Retinal flat-mounts of SDT rats showed venous dilation and meandering vascular networks. Furthermore, acellular capillaries were observed in the retinal trypsin digestion. Insulin treatment prevented these ocular abnormalities in SDT rats. CONCLUSIONS These findings indicate that ocular complications of SDT rats are caused by hyperglycaemia. The features of SDT rats indicate their usefulness for the future study of diabetic retinopathy.
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Affiliation(s)
- T Sasase
- Japan Tobacco, Central Pharmaceutical Research Institute, Takatsuki, Osaka, Japan.
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30
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Miyajima K, Ohira T, Usuda J, Saji H, Tsuboi M, Hirano T, Kato H, Suzuki M, Toyooka S, Gazdar AF. The relationship between RASSF1A aberrant methylation and survival in small sized lung adenocarcinoma. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.7199] [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: 11/20/2022] Open
Abstract
7199 Background: Aberrant methylation of CpG islands in promoter regions of tumor cells is one of the major mechanisms for silencing of tumor suppressor genes. The RAS association domain family 1A (RASSF1A) gene was isolated from the 3p21.3 region homozygously deleted in lung cancer cell lines, and it was shown to be inactivated by hypermethylation of the promoter region in lung cancers. In this study, we investigated the clinicopathological significances of RASSF1A methylation in the development and/or progression of small-sized (less than 2.0cm) lung adenocarcinoma. It is important to identify a marker for high-risk early stage patients who should benefit from new investigational adjuvant therapies. Methods: Surgically resected specimens from 77 cases of small-sized primary lung adenocarcinoma. We determined the frequency of aberrant promoter methylation of the RASSF1A genes in small-sized adenocarcinoma. Aberrant promoter methylation was examined using methylation-specific PCR (MSP). Results: Twenty-five of 77 (32.5%) tumors showed RASSF1A methylation. RASSF1A methylation was dominantly detected in smoker (P < 0.03). There was no significant correlation of RASSF1A methylation with gender, age, T stage, N stage and pathological stage. RASSF1A methylation correlated with adverse survival by univariate analysis (P < 0.005) as well as multivariate analysis (P = 0.0062; RR 4.251; 95% C.I., 1.507–11.993). Furthermore, RASSF1A promoter hypermethylation in resected stage I small-sized lung adenocarcinoma was associated with impaired patient survival (P < 0.01). Conclusions: Aberrant promoter methylation of the RASSF1A was present in 25 of 77 (32.5%) of small-sized lung adenocarcinoma by MSP assay. These results indicated that epigenetic inactivation of RASSF1A plays an important role in the progression of small-sized lung adenocarcinoma, and that RASSF1A hypermethylation appears to be a useful molecular marker for the prognosis of patients with small-sized and stage I lung adenocarcinoma. RASSF1A is a potential tumor suppressor gene that undergoes epigenetic inactivation in lung adenocarcinoma through hypermethylation of its promoter region. RASSF1A methylation was significantly related to unfavorable prognosis in small-sized lung adenocarcinoma. No significant financial relationships to disclose.
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Affiliation(s)
- K. Miyajima
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - T. Ohira
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - J. Usuda
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - H. Saji
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - M. Tsuboi
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - T. Hirano
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - H. Kato
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - M. Suzuki
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - S. Toyooka
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
| | - A. F. Gazdar
- Tokyo Medical University, Tokyo, Japan; University of Texas Southwestern Medical Center, Dallas, TX
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Yamashita N, Yasojima M, Nakada N, Miyajima K, Komori K, Suzuki Y, Tanaka H. Effects of antibacterial agents, levofloxacin and clarithromycin, on aquatic organisms. Water Sci Technol 2006; 53:65-72. [PMID: 16862775 DOI: 10.2166/wst.2006.338] [Citation(s) in RCA: 10] [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: 05/11/2023]
Abstract
Contamination of surface waters by pharmaceutical chemicals is an emerging environmental problem. This study evaluated the toxic effects of the antibacterial agents levofloxacin (LVFX) and clarithromycin (CAM), which are widely used in Japan, on aquatic organisms. Ecotoxicity tests using a bacterium, alga and crustacean were conducted. Microtox test using a marine fluorescent bacterium showed that LVFX and CAM have no acute toxicity to the bacterium. From the results of the Daphnia immobilisation test, LVFX and CAM did not show acute toxicity to the crustacean. Meanwhile, an algal growth inhibition test revealed that LVFX and CAM have high toxicity to the microalga. The phytotoxicity of CAM was about 100-fold higher than that of LVFX from a comparison of EC50 (median effective concentration) value. From the Daphnia reproduction test, LVFX and CAM also showed chronic toxicity to the crustacean. Concentrations of LVFX and CAM in the aquatic environment were compared with PNEC (predicted no effect concentration) to evaluate the ecological risk. As a result, the ecological risk of LVFX is considered to be low, but that of CAM is higher, suggesting that CAM discharged into an aquatic environment after therapeutic use may affect organisms in the aquatic environment.
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Affiliation(s)
- N Yamashita
- Water Environment Research Group, Public Works Research Institute, Tsukuba, Ibaraki Prefecture, Japan.
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32
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Ohta T, Sasase T, Miyajima K, Matsui K, Matsushita M, Furukawa N, Yonemori F. Daily inhibition of postprandial hyperglycaemia with JTT-608, a novel oral antidiabetic agent, ameliorates pancreatic function in neonatally streptozotocin-treated rats. Diabetes Obes Metab 2005; 7:517-24. [PMID: 16050944 DOI: 10.1111/j.1463-1326.2004.00419.x] [Citation(s) in RCA: 3] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIM Chronic glycaemic control, in particular, the control of postprandial hyperglycaemia, is essential for preventing the development of diabetic complications. We therefore evaluated the chronic treatment effect of a new antidiabetic agent, JTT-608 [trans-4-(methylcyclohexyl)-4-oxobutyric acid], in neonatally streptozotocin-treated rats. METHODS The rats were maintained with liquid meal three times a day and treated orally with JTT-608 10 min before each meal for 12 weeks. Haemoglobin A1C (HbA1C) and fasting blood glucose levels were measured at 4-week intervals, and effects of JTT-608 on pancreatic function and diabetic complications were examined after dosing period. RESULTS The postprandial hyperglycaemia was suppressed by JTT-608 administration, and both HbA1C levels and fasting blood glucose levels were reduced during the experimental period. After the treatment period of 12 weeks, JTT-608 further improved the early insulin secretion and the impaired glucose tolerance after meal loading in the diabetic rats. Also, pathological examination revealed that JTT-608 reduced the incidence of the decrease in immunoreactivity of insulin. In examination of other diabetic complications, JTT-608 ameliorated the reduced motor nerve conduction velocities observed in diabetic rats and inhibited the incidence of cataracts with diabetes. CONCLUSIONS We conclude that a newly developed antidiabetic agent, JTT-608, improves the pancreatic function and prevents the development of diabetic complications by inhibition of daily postprandial hyperglycaemia and could be useful for the treatment of diabetic subjects with impaired insulin secretion.
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Affiliation(s)
- T Ohta
- Japan Tobacco, Central Pharmaceutical Research Institute, 1-1, Murasaki-cho, Takatsuki, Osaka, Japan.
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33
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Higashitani T, Miyajima K, Nakada N, Yasojima M, Tanaka H, Suzuki Y. Development of on-site fish exposure system placed in water quality monitoring stations along a river. Water Sci Technol 2005; 52:275-82. [PMID: 16477996] [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] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Estrogen-like substances have been suspected to cause feminization of wild fish in rivers in Japan. To elucidate the influence of estrogen-like substances on fish in river, we have started to develop the on-site continuous fish exposure system using medaka Oryzias latipes that were placed in water quality monitoring stations along a river. Adult male medaka were exposed to the river water in a glass exposure tank placed in the monitoring stations. Flow rate of water and water temperature were controlled at 30 L/hour and 26 degrees C respectively, and a light: dark cycle was maintained 16:8 hours. A commercial diet free from phytoestrogens was fed 4 times in a day using automatic feeder. After 2-week exposure, hepatic vitellogenin concentration of each male medaka was measured. The exposure tests were repeatedly performed at both the upstream and the downstream of sewage treatment plants along the River Tama which is a representative urbanized river in Japan. At the control site Haijimabashi monitoring station, vitellogenin was not detected in male medaka. On the other hand, at the Ishihara monitoring station which is the most downstream in this test area, every male medaka were produced vitellogenin in the test performed in the spring of 2004. As the results of the water quality analysis, it could be inferred that the estrone derived from effluents of sewage treatment plants caused the feminization of male medaka. The reason why the concentrations of the estrone and the estrogenic activity using DNA recombinant yeast varied in proportion to the electric conductivity of river water measured at the water quality monitoring station. Furthermore, after continuous 2-week exposure, the vitellogenin production of male medaka was reduced similar to the decrease of the concentrations of the estrone and the estrogenic activity of river water.
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Affiliation(s)
- T Higashitani
- Water Quality Research Team, Public Works Research Institute, 1-6, Minami-hara, Tsukuba, Ibaraki, 305-8516 Japan.
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Hisatomi E, Miyajima K, Yasumori K, Okamura H, Nonaka M, Watanabe J, Muranaka T, Mori H. Retroperitoneal bronchogenic cyst: a rare case showing the characteristic imaging feature of milk of calcium. ACTA ACUST UNITED AC 2003; 28:716-20. [PMID: 14628883 DOI: 10.1007/s00261-003-0003-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [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: 12/15/2022]
Abstract
Bronchogenic cysts are rare congenital anomalies of the primitive foregut that are usually found above the diaphragm, and a retroperitoneal location is extremely unusual. Due to the low prevalence of these pathologies, their imaging features have seldom been described. We report a rare case of retroperitoneal bronchogenic cyst showing characteristic imaging features of milk of calcium on plain abdominal radiography and computed tomography.
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Affiliation(s)
- E Hisatomi
- Department of Radiology, National Kyushu Medical Center 1-8-1 Jigyouhama, Chuou-ku, Fukuoka 810-8563, Japan
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Abstract
AIMS The pathogenic mechanism and predictive indicators of biological behaviour of inflammatory myofibroblastic tumour are poorly understood. We investigated molecular abnormalities of p53 and MDM2 in order to assess whether these play an important role in pathogenesis, and whether they also contribute to clinicopathological aggressive phenotype in inflammatory myofibroblastic tumour. METHODS AND RESULTS We compared the immunohistochemical expression of calponin, h-caldesmon, ALK, and p53 gene mutation and MDM2 gene amplification with clinicopathological findings in 15 cases of inflammatory myofibroblastic tumour. Histologically, cellular atypia was observed in five (33.3%) out of 15 cases. Local recurrences were observed in two (14.3%) of 14 informative cases, but no distant metastasis was observed. The expression of calponin (9/14; 64%) but not h-caldesmon (0/14; 0%) was seen, which suggested myofibroblastic differentiation. ALK expression was seen in eight (53.3%) out of 15 cases, particularly in patients under 40 years old. Nuclear expression of p53 protein was recognized in only one (6.7%) of 15 cases, and polymerase chain reaction single-strand conformation polymorphism followed by direct sequencing revealed p53 gene missense mutations in two (13.3%) of 15 cases. Nuclear expression of MDM2 was seen in four (26.7%) of 15 cases, and the MDM2 gene amplification was observed in two of the four cases. CONCLUSION Inflammatory myofibroblastic tumour shows a wide spectrum of cellular atypia and biological behaviour with p53 and MDM2 expression. However, the alterations in the p53 pathway seem not to play a major role in the pathogenesis of inflammatory myofibroblastic tumour.
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MESH Headings
- Adult
- Anaplastic Lymphoma Kinase
- Biomarkers, Tumor
- Calcium-Binding Proteins/metabolism
- Calmodulin-Binding Proteins/metabolism
- Cell Nucleus/metabolism
- Child, Preschool
- Female
- Gene Amplification
- Genes, p53
- Granuloma, Plasma Cell/genetics
- Granuloma, Plasma Cell/metabolism
- Granuloma, Plasma Cell/pathology
- Humans
- Immunoenzyme Techniques
- Infant
- Male
- Microfilament Proteins
- Middle Aged
- Mutation
- Neoplasm Recurrence, Local
- Neoplasms, Muscle Tissue/genetics
- Neoplasms, Muscle Tissue/metabolism
- Neoplasms, Muscle Tissue/pathology
- Nuclear Proteins
- Polymerase Chain Reaction
- Polymorphism, Single-Stranded Conformational
- Protein-Tyrosine Kinases/metabolism
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- Proto-Oncogene Proteins c-mdm2
- Receptor Protein-Tyrosine Kinases
- Tumor Suppressor Protein p53/genetics
- Tumor Suppressor Protein p53/metabolism
- Calponins
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Affiliation(s)
- H Yamamoto
- Department of Anatomic Pathology, Pathological Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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36
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Takahashi M, Nakajima S, Miyajima K, Ogata K, Suzuki A, Konaka C, Kato H. Role of xenoreactive natural antibodies in pig-to-human lung xenotransplantation. Transplant Proc 2002; 34:2739-44. [PMID: 12431591 DOI: 10.1016/s0041-1345(02)03392-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M Takahashi
- First Department of Surgery, Tokyo Medical University, Tokyo, Japan.
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Affiliation(s)
- M. Ohara
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Y. Nakamura
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Y. Negishi
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - K. Miyajima
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - A. Nakajima
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - K. Kaya
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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38
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Sakamoto A, Oda Y, Yamamoto H, Oshiro Y, Miyajima K, Itakura E, Tamiya S, Honda Y, Ishihara A, Iwamoto Y, Tsuneyoshi M. Calponin and h-caldesmon expression in atypical fibroxanthoma and superficial leiomyosarcoma. Virchows Arch 2002; 440:404-9. [PMID: 11956822 DOI: 10.1007/s004280100521] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2001] [Accepted: 07/30/2001] [Indexed: 11/29/2022]
Abstract
To evaluate smooth muscle differentiation, myogenic markers [desmin, alpha-smooth muscle actin (SMA), and muscle-specific actin (HHF35)] have been widely used. Calponin and h-caldesmon, which are cytoskeleton-associated actin-binding proteins, have been reported to be more specific myogenic markers, especially since myofibroblasts express a small amount of h-caldesmon. Atypical fibroxanthoma (AFX) occurs in the sun-exposed skin of the elderly and follows a benign clinical course. Histologically, AFX, which is a pleomorphic spindle cell tumor and considered to be a superficial variant of malignant fibrous histiocytoma, also mimics leiomyosarcoma. AFX has been thought to differentiate along pathways with fibrohistiocytic and myofibroblastic phenotypes. AFX ( n=10), superficial leiomyosarcoma (S-LMS) ( n=17) and benign fibrous histiocytoma (BFH) ( n=17) were analyzed for myofibroblastic and smooth muscle differentiation immunohistochemically from the viewpoint of comparison. AFX and BFH showed immunoreactivities respectively for calponin (3/10, 11/17), desmin (3/10, 1/17), SMA (3/10, 13/17), and HHF35 (1/10, 5/17), but failed to express h-caldesmon (0/10, 0/17). S-LMS had a high immunoreactive rate of calponin (17/17), desmin (13/17), SMA (16/17), and HHF35 (16/17), while also expressing caldesmon (11/17). The results reveal that AFX and BFH have immunoreactivities for several myogenic markers, with myofibroblastic differentiation (calponin: +/-, h-caldesmon: -), but without the smooth muscle differentiation seen in S-LMS (calponin:+, h-caldesmon: +/-). In addition, calponin and h-caldesmon are considered to be useful markers for distinguishing AFX from S-LMS.
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Affiliation(s)
- A Sakamoto
- Department of Anatomic Pathology, Pathological Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
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Miyajima K, Oda Y, Oshiro Y, Tamiya S, Kinukawa N, Masuda K, Tsuneyoshi M. Clinicopathological prognostic factors in soft tissue leiomyosarcoma: a multivariate analysis. Histopathology 2002; 40:353-9. [PMID: 11943020 DOI: 10.1046/j.1365-2559.2002.01361.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [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: 11/20/2022]
Abstract
AIMS Prognostic factors affecting survival in cases of leiomyosarcoma of soft parts were investigated in this study. METHODS AND RESULTS A retrospective study of 267 patients was carried out. This group comprised 142 females (53%) and 125 males (47%), whose ages ranged from 7 to 95 years (median 58 years). One hundred and five cases were superficially situated (arising from the skin or subcutis), while the remaining 162 cases were deeply situated (subfacial). Nineteen were cases of pleomorphic leiomyosarcoma where the diagnosis had been amended from malignant fibrous histiocytoma to leiomyosarcoma whilst under review. Of the 167 patients with follow-up data, 83 died of leiomyosarcoma. In univariate analysis, depth, tumour size (>or=50 mm), mitotic rate of >20 per 10 high-power fields (HPF), tumour necrosis of >50% and a high stage according to the most recent American Joint Committee on Cancer (AJCC) staging for soft tissue sarcoma were found to lessen significantly the rate of survival (log rank test; P < 0.05). However, in multivariate analysis (Cox's proportional hazards model), tumour size and high AJCC stage were the only factors that were correlated independently with decreased survival. CONCLUSIONS This study indicates that the most reliable prognostic parameters are tumour size and AJCC stage in leiomyosarcoma.
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Affiliation(s)
- K Miyajima
- Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Ohara M, Miyajima K, Pramann A, Nakajima A, Kaya K. Geometric and Electronic Structures of Terbium−Silicon Mixed Clusters (TbSin; 6 ≤ n ≤ 16). J Phys Chem A 2002. [DOI: 10.1021/jp012952c] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Ohara
- Keio University, Faculty of Science and Technology, Department of Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - K. Miyajima
- Keio University, Faculty of Science and Technology, Department of Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - A. Pramann
- Keio University, Faculty of Science and Technology, Department of Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - A. Nakajima
- Keio University, Faculty of Science and Technology, Department of Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - K. Kaya
- Keio University, Faculty of Science and Technology, Department of Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, and Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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Toyooka S, Toyooka KO, Maruyama R, Virmani AK, Girard L, Miyajima K, Harada K, Ariyoshi Y, Takahashi T, Sugio K, Brambilla E, Gilcrease M, Minna JD, Gazdar AF. DNA methylation profiles of lung tumors. Mol Cancer Ther 2001; 1:61-7. [PMID: 12467239] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
Aberrant methylation of CpG islands in promoter regions of tumor cells is one of the major mechanisms for silencing of tumor suppressor genes. We determined the frequency of aberrant promoter methylation of the p16, adenomatous polyposis coli (APC), H-cadherin (CDH13), glutathione S-transferase P1 (GSTP1), O6-methylguanine-DNA-methyltransferase (MGMT), retinoic acid receptor beta-2 (RAR beta), E-cadherin (CDH1), and RAS association domain family 1A (RASSF1A) genes in 198 tumors consisting of small cell lung cancers [SCLCs (n = 43)], non-small cell lung cancers [NSCLCs (n = 115)], and bronchial carcinoids (n = 40). The profile of methylated genes in the two neuroendocrine tumors (SCLC and carcinoids) were very different from that of NSCLC. However, whereas the overall pattern of aberrant methylation of carcinoids was similar to that of SCLC, carcinoids had lower frequencies of methylation for some of the genes tested. There were also significant differences in the methylation profiles between the two major types of NSCLC, adenocarcinoma and squamous cell carcinoma. We performed cluster analysis and found that SCLCs clustered with other SCLCs and carcinoids but not with NSCLCs, whereas the NSCLCs tended to cluster together. Within NSCLCs, adenocarcinomas and squamous cell carcinomas clustered with their respective histological types. Finally, we compared the methylation profiles of SCLC and NSCLC tumors and their respective cell lines (n = 44). In general, methylation frequencies were higher in tumor cell lines, but these differences were seldom significant. Thus, tumor cell lines appear to be suitable models to study aberrant DNA methylation. We conclude that SCLC, carcinoids, squamous cell carcinomas, and adenocarcinomas of the lung have unique profiles of aberrant methylation. Our findings should help us understand differences in the pathogenetic mechanisms of lung cancers.
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Affiliation(s)
- S Toyooka
- Hamon Center for Therapeutic Oncology Research, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, TX 75390-8563, USA
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42
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Oda Y, Miyajima K, Kawaguchi K, Tamiya S, Oshiro Y, Hachitanda Y, Oya M, Iwamoto Y, Tsuneyoshi M. Pleomorphic leiomyosarcoma: clinicopathologic and immunohistochemical study with special emphasis on its distinction from ordinary leiomyosarcoma and malignant fibrous histiocytoma. Am J Surg Pathol 2001; 25:1030-8. [PMID: 11474287 DOI: 10.1097/00000478-200108000-00007] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.7] [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: 01/01/2023]
Abstract
Pleomorphic leiomyosarcoma (PLMS) was recently described as a morphologic variant of leiomyosarcoma; however, its diagnostic criteria, as shown by morphologic features and biologic behavior, remain controversial. We describe 28 cases of pleomorphic sarcoma with pleomorphic areas in more than two thirds of the tumor and an ordinary leiomyosarcomatous fascicular area covering less than one third as PLMS. PLMS comprised 8.6% of all the leiomyosarcomas (322 cases) registered in our institute. Patients ranged in age from 31 to 89 years (average, 57.9 years). Seventeen patients (60.7%) were male and 11 were female. Tumor location was as follows: the extremities in 17 cases, the retroperitoneum or abdominal cavity in 7 cases, the chest/abdominal wall in 3 cases, and the scalp in 1 case. Histologically, all cases showed at least small foci of fascicles consisting of smooth muscle tumor cells, in addition to pleomorphic areas mimicking storiform-pleomorphic malignant fibrous histiocytoma. The border between pleomorphic and leiomyosarcomatous fascicular areas was sharp in 3 cases, gradual in 2 cases, and blending in 23 cases. Sixteen cases (57.1%) showed a typical storiform pattern, 6 cases revealed extensive stromal hyalinization, 6 cases showed a chronic inflammatory infiltrate, 2 cases had the foci of foamy xanthomatous cells, and 7 cases contained myxoid malignant fibrous histiocytoma-like areas covering less than 50% of the tumor. The tumors had a tendency to be of a morphologically higher grade (10 tumors were French Federation of Cancer Centers grade 2, 18 were grade 3). Five of 28 cases (18%) showed rhabdoid features. Immunohistochemically, all of the 28 tumors examined showed a positive reactivity for at least one smooth muscle marker (desmin, muscle-specific actin, and alpha-smooth muscle actin) in the leiomyosarcomatous fascicular areas. In the pleomorphic areas the expression of smooth muscle markers (desmin 10 of 28, muscle-specific actin 13 of 28, and alpha-smooth muscle actin 14 of 28) was significantly reduced, compared with that in leiomyosarcomatous fascicular area (desmin 18 of 28, muscle-specific actin 26 of 28, and alpha-smooth muscle actin 24 of 28). No significant difference was observed between the MIB-1 labeling index in the leiomyosarcomatous fascicular areas (26.10 on average) and that in the pleomorphic areas (26.17 on average). However, the MIB-1 labeling index in PLMS was significantly higher than that in ordinary leiomyosarcoma (n = 20, 12.86 on average) or storiform-pleomorphic malignant fibrous histiocytoma (n = 16, 16.63 on average). In 23 patients follow-up data were available with a duration of 1-239 months. Eleven patients developed metastases, and lung accounted for the most common site of metastasis (9 cases). Fifteen of 23 patients (65.2%) died of disease. Our results indicate that PLMS should be differentiated from ordinary leiomyosarcoma because of its high proliferative activities and rather aggressive biologic behavior.
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Affiliation(s)
- Y Oda
- Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Palpant B, Negishi Y, Sanekata M, Miyajima K, Nagao S, Judai K, Rayner DM, Simard B, Hackett PA, Nakajima A, Kaya K. Electronic and geometric properties of exohedral sodium- and gold-fullerenes. J Chem Phys 2001. [DOI: 10.1063/1.1366641] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Takahashi M, Nishimura S, Miyajima K, Sasahara K, Yoshida M, Ando J, Maekawa A. Time-dependent promotion activity of 17beta-estradiol on uterine carcinogenesis in mice initiated with N-ethyl-N-nitrosourea. Cancer Lett 2001; 165:123-30. [PMID: 11275360 DOI: 10.1016/s0304-3835(00)00709-6] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The time-dependent promotion activity of 17beta-estradiol (E2) by initiation with N-ethyl-N-nitrosourea (ENU) on induction of mouse uterine endometrial proliferative lesions was examined. Illumination-induced persistent estrous female CD-1 mice were divided into five groups at 9 weeks of age. At 10 weeks of age, mice in all groups (n=25) were given a single intra-uterine administration of ENU (50 mg/kg), dissolved in polyethylene glycol. Animals in Groups 2 to 5 were then implanted s.c. with an E2 pellet at 9, 11, 14 and 17 weeks of age. The implants were left in place for 8 weeks and then taken out. At the termination of the experiment (week 15 after the ENU-treatment), all surviving mice were killed and the development of uterine proliferative lesions were assessed. All groups demonstrated endometrial hyperplasias and adenocarcinomas and the incidences of the latter in ENU plus E2 treated animals (Groups 2 to 5; 36, 48, 35 and 36%, respectively) were significantly higher compared to 8% for Group 1, without any variation with the age at E2 treatment. However, the incidences of adenocarcinomas plus severe hyperplasias increased from Groups 1 to 5 (28, 40, 56; P<0.05, 61; P<0.05 and 80%; P<0.01, respectively), indicating that promotion effects of E2 on induction of uterine proliferative lesions in the uterine endometrium become more pronounced with the interval after ENU initiation.
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Affiliation(s)
- M Takahashi
- Department of Pathology, Sasaki Institute, 2-2 Kanda-Surugadai, Chiyoda-ku, 101-0062, Tokyo, Japan
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Miyajima K, McNamara JA, Murata S. A diagnostic index of vertical problems for Class III malocclusions. Int J Adult Orthodon Orthognath Surg 2001; 12:189-95. [PMID: 9511489] [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] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A cephalometric investigation was undertaken to derive a vertical indicator--a single value derived from a series of cephalometric variables that can be used in the differential diagnosis of Class III patients. The subjects consisted of 76 Japanese female patients whose chief complaint was anterior crossbite and who presented with either open bite or anterior deep overbite. All the data were derived from the initial lateral cephalometric radiographs. The main skeletal measurements that characterize vertical problems were selected using cluster analysis, principal component analysis, and discriminant analysis. As a result, a Class III vertical indicator was derived. The vertical indicator score for deep overbite was -2.5 +/- 2.2, whereas the vertical indicator score for open bite was +2.5 +/- 2.3. This vertical indicator may be used in diagnosing the nature of vertical problems and determining the appropriate treatment and prognosis for the individual Class III female patient.
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Affiliation(s)
- K Miyajima
- Department of Orthodontics, Aichi-Gakuin University, School of Dentistry, Nagoya, Japan.
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Miyajima K, Tamiya S, Oda Y, Adachi T, Konomoto T, Toyoshiba H, Masuda K, Tsuneyoshi M. Relative quantitation of p53 and MDM2 gene expression in leiomyosarcoma; real-time semi-quantitative reverse transcription-polymerase chain reaction. Cancer Lett 2001; 164:177-88. [PMID: 11179833 DOI: 10.1016/s0304-3835(00)00607-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [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: 12/18/2022]
Abstract
To investigate the etiology of leiomyosarcoma, we examined abnormalities of p53 and its regulation in 13 cases of leiomyosarcoma using fresh tumor specimens. We estimated p53 and MDM2 mRNA level and MDM2 gene amplification using a real-time semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) based on the TaqMan fluorescence method. We also used immunohistochemistry (IHC) for p53 and MDM2 protein overexpression, polymerase chain reaction single-strand conformation polymorphism (PCR-SSCP) and direct sequencing to detect p53 mutation. Eight of the 13 cases (62%) showed an overexpression of p53 protein on IHC and eight of 13 cases (62%) had p53 gene point mutations. Five of the 13 cases (38%) showed positive staining for MDM2 protein and only one case (7.7%) demonstrated MDM2 gene amplification. The relative p53 mRNA level of the tumors compared with normal tissue ranged from 1.14 to 12.19 arbitrary units (AU), and the MDM2 mRNA level ranged from 1.06 to 17.17 AU. The mRNA level in the p53-positive cases was higher than in the negative cases (positive: 7.70 AU on average; negative: 3.38 AU on average; P=0.0344). However, there was no significant correlation between the MDM2 mRNA level and other factors, such as p53 IHC, p53 mutation status, p53 mRNA level and MDM2 IHC. Our results indicate that p53 abnormalities are major events and that an increasing level of p53 mRNA is associated with an overexpression of p53 protein in leiomyosarcoma and they may play an important role in the tumorigenesis in this tumor.
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Affiliation(s)
- K Miyajima
- Department of Anatomic Pathology, (Second Department of Pathology), Pathological Sciences, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, 812-8582, Fukuoka, Japan
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Kameyama K, Takami H, Miyajima K, Mimura T, Hosoda Y, Ito K, Ito K. Papillary carcinoma occurring within an adenomatous goiter of the thyroid gland in Cowden's disease. Endocr Pathol 2001; 12:73-6. [PMID: 11478271 DOI: 10.1385/ep:12:1:73] [Citation(s) in RCA: 14] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Cowden's disease is an autosomal dominant disorder characterized by multiple benign and malignant neoplastic lesions involving many organs. The presence of characteristic cutaneous lesions is crucial for the diagnosis. Thyroid disease is a major extracutaneous manifestation of this disease; however, the histologic characteristics have not been described in detail. We report a case of thyroid tumor associated with Cowden's disease. Grossly, the tumor showed a multinodular appearance, like an adenomatous goiter. Microscopically, it consisted of follicular adenomas with a trabecular pattern. Some of the nodules had a second component resembling papillary carcinoma. This was thought to be a unique histological feature not described previously, and might be specific to thyroid tumor associated with Cowden's disease.
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MESH Headings
- Adenoma/chemistry
- Adenoma/complications
- Adenoma/pathology
- Adenoma/surgery
- Adult
- Carcinoma, Papillary/chemistry
- Carcinoma, Papillary/complications
- Carcinoma, Papillary/pathology
- Carcinoma, Papillary/surgery
- Female
- Goiter, Nodular/complications
- Goiter, Nodular/metabolism
- Goiter, Nodular/pathology
- Goiter, Nodular/surgery
- Hamartoma Syndrome, Multiple/complications
- Hamartoma Syndrome, Multiple/metabolism
- Hamartoma Syndrome, Multiple/pathology
- Hamartoma Syndrome, Multiple/surgery
- Humans
- Thyroglobulin/analysis
- Thyroid Neoplasms/chemistry
- Thyroid Neoplasms/complications
- Thyroid Neoplasms/pathology
- Thyroid Neoplasms/surgery
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Affiliation(s)
- K Kameyama
- Division of Diagnostic Pathology, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
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Yoneyama K, Shima K, Ghi H, Ishizumi T, Ichinose S, Okada S, Nakajima R, Taguchi F, Kito T, Nitadori J, Ishida J, Miyajima K, Kato H. Recent problems in population surveys for lung cancer. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80819-3] [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: 11/27/2022]
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Ochiai H, Horino O, Miyajima K, Kaku H. Genetic Diversity of Xanthomonas oryzae pv. oryzae Strains from Sri Lanka. Phytopathology 2000; 90:415-421. [PMID: 18944593 DOI: 10.1094/phyto.2000.90.4.415] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
ABSTRACT Sixty strains of Xanthomonas oryzae pv. oryzae, collected from 29 locations in Sri Lanka in 1995, were analyzed by restriction fragment length polymorphism using either polymerase chain reaction-amplified 16S and 23S rDNA or the repetitive DNA element IS1112 from X. oryzae pv. oryzae as hybridization probes. Two different ribogroups were observed in the Sri Lankan strains using rDNA probes, whereas five clusters were identified by the IS1112 probe. Bootstrap analysis revealed that the five clusters defined by IS1112 were relatively robust. Our results suggest that the Sri Lankan strains are phylogenetically composed of five different groups. Each cluster was partially associated with climatic conditions (intermediate zone and wet zone) and was related to groups based on ribotyping. Based on virulence analysis using 12 rice cultivars, each containing a single resistance gene, 14 pathotypes were identified among the Sri Lankan strains. All strains were virulent to resistance genes Xa1, Xa2, Xa4, Xa10, Xa11, and Xa14. Only one strain (pathotype 1) was virulent to all major resistance genes including Xa21, while strains of the other pathotypes were all avirulent to Xa21. A partial relationship was found between the determined phylogenetic groups using the IS1112 probe and pathotypes for all but two clusters. The results of this study will facilitate the further understanding of the population structure of X. oryzae pv. oryzae in Sri Lanka.
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Ikeda K, Miyajima K, Shimizu T, Achiwa K. Lipid A and related compounds. XXXVII. Determination of favorable binding linkages of lipid A analog to antigen moiety for synthetic vaccines. Chem Pharm Bull (Tokyo) 2000; 48:32-40. [PMID: 10705471 DOI: 10.1248/cpb.48.32] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 11/22/2022]
Abstract
For the determination of favorable binding linkages of lipid A analog as a synthetic immunoadjuvant to the antigen moiety for synthetic vaccines, new N-acylated L-serine-containing D-glucosamine analogs (Type A, B, C) were synthesized and their mitogenicities were examined. Among chemically synthesized compounds (6-15, 30), compound 8 for Type B exhibited the most potent mitogenicity.
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Affiliation(s)
- K Ikeda
- School of Pharmaceutical Sciences, University of Shizuoka, Japan
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