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result(s) for
"Miyamoto, Shotaro"
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Electronic structure and thermal conductance of the MASnI3/Bi2Te3 interface: a first-principles study
by
Miyazaki, Koji
,
Morimoto, Masayuki
,
Kawano, Shoya
in
639/301/1034/1035
,
639/301/299/2736
,
Composite materials
2022
To develop high-performance thermoelectric devices that can be created using printing technology, the interface of a composite material composed of MASnI
3
and Bi
2
Te
3
, which individually show excellent thermoelectric performance, was studied based on first-principles calculations. The structural stability, electronic state, and interfacial thermal conductance of the interface between Bi
2
Te
3
and MASnI
3
were evaluated. Among the interface structure models, we found stable interface structures and revealed their specific electronic states. Around the Fermi energy, the interface structures with Te
II
and Bi terminations exhibited interface levels attributed to the overlapping electron densities for Bi
2
Te
3
and MASnI
3
at the interface. Calculation of the interfacial thermal conductance using the diffuse mismatch model suggested that construction of the interface between Bi
2
Te
3
and MASnI
3
could reduce the thermal conductivity. The obtained value was similar to the experimental value for the inorganic/organic interface.
Journal Article
Importance of dietary salt restriction for patients with primary aldosteronism during treatment with mineralocorticoid receptor antagonists: The potential importance of post-treatment plasma renin levels
by
Miyamoto, Shotaro
,
Yoshida, Yuichi
,
Okamoto, Mitsuhiro
in
Aldosterone
,
Blood Pressure - physiology
,
Diet
2023
We measured dietary salt intake in 26 patients with primary aldosteronism treated with mineralocorticoid receptor antagonists and evaluated whether plasma renin levels were affected by dietary salt intake pre-treatment and post 6 months of mineralocorticoid receptor antagonist treatment. The dietary salt intake level was calculated using spot urine sodium and creatinine concentrations, body weight, height, and age. The clinical parameters pre- and post- treatment were compared. The systolic and diastolic blood pressure levels decreased, and the serum potassium and active renin concentration increased significantly. Although the dietary salt intake did not change after treatment, the differences in dietary salt intake and active renin concentration pre- and post- treatment were inversely correlated (r = -0.418, p = 0.03). The 26 patients were divided into two groups with active renin concentration levels ≥5 pg/mL (Group 1) and <5 pg/mL (Group 2) after treatment. The Group parameters did not differ pre- and post- treatment. Group 1 evidenced improvements in systolic and diastolic blood pressures, and the potassium level and active renin concentration over time; Group 2 did not. Group 1 evidenced no significant correlation between the differences in dietary salt intake and active renin concentration levels (r = -0.481, p = 0.11) but Group 2 showed a strong inverse correlation (r = -0.7599, p = 0.01). In conclusion, we found that an active renin concentration level <5 pg/mL post-mineralocorticoid receptor antagonist treatment may indicate that salt sensitivity has not adequately improved, emphasizing the importance of measuring plasma renin levels after such treatment.
Journal Article
Prophylactic use of duloxetine hydrochloride in oxaliplatin-induced first-bite syndrome
by
Muraoka, Atsushi
,
Miyamoto, Shotaro
,
Uraguchi, Kensuke
in
Adenocarcinoma
,
Appendix
,
Cancer therapies
2025
First-bite syndrome (FBS) is manifested as acute and severe pain in the parotid region occurring at the first bite of a meal. While most cases of FBS arise after surgeries involving the deep lobe of the parotid gland, chemotherapy-induced FBS is extremely rare. Some adverse effects of oxaliplatin resemble FBS, suggesting it may be under-recognized. Here, we present a case of a 72 year-old male with oxaliplatin-induced FBS, effectively managed with the prophylactic administration of duloxetine hydrochloride. The patient, with a history of surgery for appendiceal adenocarcinoma, experienced sharp pain in the bilateral parotid regions at the beginning of each meal after the second to fourth courses of adjuvant chemotherapy with CapeOX (oxaliplatin and capecitabine). He was subsequently referred to our department for evaluation. Upon examination, no organic diseases were identified. Given the reproducible nature of the symptoms, oxaliplatin-induced FBS was diagnosed. We commenced prophylactic duloxetine hydrochloride before the fifth and sixth courses of chemotherapy, which significantly reduced the pain. After completing six courses of oxaliplatin, the patient no longer experienced symptoms of FBS, even without the continued administration of duloxetine hydrochloride. This case highlights that oxaliplatin can induce FBS, which can be effectively managed with duloxetine hydrochloride.
Journal Article
Effects of esaxerenone on blood pressure, urinary albumin excretion, serum levels of NT-proBNP, and quality of life in patients with primary aldosteronism
by
Miyamoto, Shotaro
,
Yoshida, Yuichi
,
Fujiwara, Mio
in
Albumins - pharmacology
,
Antihypertensives
,
Blood Pressure
2024
Primary aldosteronism (PA) is typically managed with mineralocorticoid receptor antagonists (MRAs) barring adrenalectomy. The efficacy of esaxerenone, a nonsteroidal MRA, were explored in patients with PA. Various parameters such as the urinary albumin to creatinine ratio (UACR) and serum levels of N-terminal prohormone of brain natriuretic peptide (NT-proBNP) were evaluated in 25 PA patients before and 3 and 6 months after esaxerenone treatment. Systolic and diastolic blood pressure (BP), and the estimated glomerular filtration rate decreased after treatment, while serum levels of potassium and active renin increased. Significant reductions were observed in UACR 3 and 6 months after treatment. A significant decrease in NT-proBNP was evident at 6 months but not 3 months after treatment. Correlation analysis indicated that the reductions in BP and UACR at 3 months were independent of estimated daily salt intake. Furthermore, the effect of esaxerenone treatment on lowering UACR and NT-proBNP levels was independent of BP reduction. Responders whose systolic BP decreased 6 months after esaxerenone treatment by more than 10 mmHg compared to pretreatment had higher pretreatment NT-proBNP and similar UACR before and after treatment when compared with nonresponders. Esaxerenone improved mental, physical, and social quality of life (QOL) 6 months after treatment compared to healthy controls and increased over time. No patients discontinued treatment due to severe hyperkalemia or renal dysfunction. In conclusion, esaxerenone is a safe and effective MRA for PA treatment, offering significant benefits in terms of hypertension, albuminuria, NT-proBNP levels, and QOL improvement.
Esaxerenone effectively lowers BP, UACR, and serum levels of NT-proBNP independent of dietary salt intake in mild PA patients.
ARC
active renin concentration,
DBP
diastolic blood pressure,
MR
mineralocorticoid receptor,
MRA
mineralocorticoid receptor antagonist,
NT-proBNP
N-terminal pro-brain natriuretic peptide,
PA
primary aldosteronism, QOL quality of life,
SBP
systolic blood pressure,
SF-36
Medical Outcomes Study 36-Item Short-Form Health Survey,
UACR
urinary albumin to creatinine ratio.
Esaxerenone effectively lowers BP, UACR, and serum levels of NT-proBNP independent of dietary salt intake in mild PA patients.
ARC
active renin concentration,
DBP
diastolic blood pressure,
MR
mineralocorticoid receptor,
MRA
mineralocorticoid receptor antagonist,
NT-proBNP
N-terminal pro-brain natriuretic peptide,
PA
primary aldosteronism, QOL quality of life,
SBP
systolic blood pressure,
SF-36
Medical Outcomes Study 36-Item Short-Form Health Survey,
UACR
urinary albumin to creatinine ratio.
Journal Article
Effects of Sleeve Gastrectomy and Treadmill Exercise on Skeletal Muscle and Ectopic Fat in High-Fat Diet-Induced Obese Rats
by
Miyamoto, Shotaro
,
Yoshida, Yuichi
,
Shibata, Hirotaka
in
Adiponectin - blood
,
Adiponectin - metabolism
,
Adipose Tissue - metabolism
2025
A high-fat diet (HFD) can lead to obesity and skeletal muscle atrophy. Sleeve gastrectomy (SG) improves obesity and increases skeletal muscle mass. This study examined whether SG prevented skeletal muscle atrophy in a diet-induced rat obesity rat model. First, 8-week-old male Sprague-Dawley rats underwent surgical (sham-operated or SG) and dietary (standard, high-fat diet, or same pair feeding as SG [PF]) interventions without exercise. In the second experiment, treadmill exercise was added for 4 weeks post-SG (SG + Ex). In the third experiment, rats received an adiponectin receptor agonist (AdipoRon) injection. The HFD induced weight gain and decreased muscle fiber area. SG + Ex reversed these levels, followed by increases in adiponectin in the blood and skeletal muscle and myoblast determination protein 1 (MyoD) and decreased peri-muscular adipose tissue (PMAT) mass, but SG alone did not. No similar changes were observed in the PF group, with or without exercise. Injection of AdipoRon had a similar effect on skeletal muscle and PMAT as SG + Ex. The combination of SG and exercise, but not calorie restriction alone, had better impacts on skeletal muscle and PMAT than SG or exercise alone.
Journal Article
Effects of Sleeve Gastrectomy on Blood Pressure Reduction in Diet-Induced Obese Hypertensive Rats: A Potential Role of Prouroguanylin
2025
Background/Objectives: Sleeve gastrectomy (SG) is the most commonly performed bariatric surgery worldwide. It results in significant weight loss and improves metabolic disorders such as hypertension. Weight loss is thought to be the main factor contributing to blood pressure (BP) reduction after SG. Small-intestinal hormones may also mediate the antihypertensive effects of SG. We aimed to investigate the mechanisms underlying the antihypertensive effects of SG through small-intestinal hormones independently of weight loss. Methods: This study involved male Sprague–Dawley rats that underwent a sham operation or SG, followed by a dietary intervention involving a standard diet, a high-fat and high-salt diet, or pair-feeding with SG. Results: Three weeks postoperatively, SG significantly reduced systolic blood pressure (SBP) and increased urinary sodium excretion. RNA sequencing of the small intestine revealed upregulation of the gene encoding prouroguanylin (proUGN). proUGN is a small-intestinal hormone that inhibits renal sodium reabsorption by converting sodium/hydrogen ion exchanger type 3 (NHE3) in the proximal tubules into the inactive phosphorylated form at Ser552 (pS552-NHE3). Furthermore, SG significantly increased proUGN levels in the ileum and plasma, as well as the levels of pS552-NHE3 in the renal cortex. The administration of exogenous uroguanylin, which is converted from proUGN, resulted in increased renal pS552-NHE3, increased urinary sodium excretion, and decreased SBP without body weight reduction. These effects were similar to those observed with SG. Conclusions: SG increases proUGN secretion from the small intestine, leading to increased blood concentration. This inhibits NHE3 activity in the proximal tubules, promotes natriuresis and reduces BP.
Journal Article
Fulminant myocarditis associated with severe fever with thrombocytopenia syndrome: a case report
by
Yasuda, Tomotsugu
,
Miyamoto, Shotaro
,
Ito, Takashi
in
Aspartate
,
Aspartate aminotransferase
,
Blood pressure
2019
Background
Severe fever with thrombocytopenia syndrome (SFTS) is an emerging viral infectious disease with high mortality. It causes multiple organ dysfunction; however, myocarditis has never been reported as a complication with SFTS.
Case presentation
A 62-year-old previously healthy woman developed fever, fatigue, diarrhea, and a mild consciousness disorder. She visited a local clinic, and laboratory data showed leukocytopenia, thrombocytopenia, and elevation of the aspartate aminotransferase level. She was transferred to Kagoshima University Hospital and diagnosed as having SFTS by real-time reverse transcription polymerase chain reaction. Subsequently, her blood pressure gradually decreased despite fluid resuscitation and vasopressor administration. Based on elevated toroponin I levels in serum, a transient diffuse left ventricular hypokinesis and wall thickening in echocardiography, diffuse ST elevation in electrocardiography, and exclusion of other heart diseases, she was diagnosed as having fulminant myocarditis. After hemodynamic support with inotropic agents, she recovered near normal cardiac function. She was discharged to home on day 28.
Conclusions
We report the first case of fulminant myocarditis associated with SFTS.
Journal Article
Glucagon-Like Peptide-1 Receptor Agonist Semaglutide Improves Eating Behavior and Glycemic Control in Japanese Obese Type 2 Diabetic Patients
2022
We evaluated time-course changes and the relationship between eating behavior and glycemic profile during the treatment of 34 obese type 2 diabetic patients with the glucagon-like peptide-1 receptor agonist (GLP1-RA) semaglutide. Changes in dietary habits were evaluated using the Japan Society for the Study of Obesity questionnaire. Semaglutide improved body weight and hemoglobin A1C (HbA1c) 3 and 6 months after treatment. In addition, semaglutide led to marked improvements in the total scores for eating behavior items on the questionnaire. In particular, changes in the scores regarding the sensation of hunger, food preference, eating style, regularity of eating habits and emotional eating behavior were significantly improved during semaglutide treatment. By contrast, there were no significant changes in the scores for the recognition of weight and constitution and external eating behavior. Furthermore, changes in the scores regarding the sensation of hunger and food preference were correlated with changes in HbA1c after semaglutide treatment. Multivariable regression analyses showed that the change in the sensation of hunger was related to HbA1c during treatment. In conclusion, the GLP1-RA semaglutide regulates eating behavior, and, in particular, the sensation of hunger is closely related to the improvement in HbA1c by semaglutide in obese patients with type 2 diabetes.
Journal Article
Development of a New Chemiluminescent Enzyme Immunoassay Using a Two-Step Sandwich Method for Measuring Aldosterone Concentrations
by
Tanimura, Yukie
,
Nomura, Takuya
,
Miyamoto, Shotaro
in
aldosterone concentration
,
Antigens
,
Blood pressure
2021
In the present study, we developed a new chemiluminescent enzyme immunoassay (CLEIA) using a two-step sandwich method to measure aldosterone concentrations. We investigated serum and plasma aldosterone concentrations in 75 blood samples from 27 patients using a radioimmunoassay (RIA) and the CLEIA (with current and newly improved reagents) as well as liquid chromatography-tandem mass spectrometry (LC-MS/MS). Based on the results of the Passing–Bablok regression analysis, the aldosterone levels measured using CLEIA with the new reagents and those measured by LC-MS/MS were found to be significantly correlated (slope, 0.984; intercept, 0.2). However, aldosterone levels varied depending on the measurement method (i.e., CLEIA with the new reagent, CLEIA with the current reagent, and RIA). Aldosterone levels were lower with the improved CLEIA method than with RIA and CLEIA using the current reagent. Therefore, the cutoff values of the screening test as well as those of the confirmatory test for primary aldosteronism (PA) should be adjusted to follow current clinical practice guidelines for PA. The formula that can be used to obtain the aldosterone level (pg/mL) when using CLEIA with the new reagent is 0.765 × RIA (pg/mL) − 33.7. This formula will enable PA cutoff values to be set for provisional screening and confirmatory tests.
Journal Article
Pitfalls in the diagnosis and treatment of a hypertensive patient with unilateral primary aldosteronism and contralateral pheochromocytoma: a case report
by
Fujinami, Hiroyuki
,
Miyamoto, Shotaro
,
Gotoh, Koro
in
Adrenal Gland Neoplasms - complications
,
Adrenal Gland Neoplasms - diagnosis
,
Adrenal Gland Neoplasms - surgery
2023
Background
Primary aldosteronism (PA) is a common cause of secondary hypertension, whereas pheochromocytoma is a rare cause of it. Thus, concomitant PA and pheochromocytoma is a very rare condition.
Case presentation
A 52-year-old woman was admitted to our hospital with suspected PA based on the presence of hypertension, spontaneous hypokalemia, and a high aldosterone-to-renin ratio. She had no catecholamine excess symptoms other than hypertension. Abdominal computed tomography (CT) showed a right lipid-rich adrenal mass and a left lipid-poor adrenal mass. PA was diagnosed by the captopril challenge test. The 24-h urinary fractionated metanephrines were slightly elevated. Adrenal vein sampling (AVS) confirmed that the right adrenal gland was responsible for aldosterone hypersecretion. Medical therapy with eplerenone was started because the patient refused surgery. Five years later, she requested surgery for PA. The second AVS confirmed right unilateral hyperaldosteronism, as expected. Repeated abdominal CT showed the enlargement of the left adrenal mass. The 24-h urinary fractionated metanephrines had risen to the diagnostic level.
123
I- metaiodobenzylguanidine (MIBG) scintigraphy showed a marked tracer uptake in the left adrenal mass with no metastatic lesion. After preoperative management with α-blockade, laparoscopic left partial adrenalectomy was performed. Immunohistochemical examination of the tumor showed chromogranin A positivity leading to the diagnosis of left pheochromocytoma.
Conclusions
We report an extremely rare case of concomitant unilateral PA and contralateral pheochromocytoma. When diagnosing unilateral PA by AVS, especially in cases with a lipid-poor adrenal mass, clinicians should rule out the possibility of the presence of pheochromocytoma before proceeding to undergo unilateral adrenalectomy. Although there is no standard treatment for this rare condition, it is essential to select personalized treatment from the perspective of conserving the adrenal gland.
Journal Article