Publications by authors named "Naoto Katakami"

Changes in blood lipid profiles in type 2 diabetes, particularly when complicated by metabolic dysfunction-associated steatotic liver disease (MASLD), have not been fully elucidated. Does MASLD influence the plasma lipidome in patients with type 2 diabetes? Patients with MASLD exhibited elevated levels of myristic acid (FA 14:0) in plasma triglycerides, which significantly decreased after comprehensive diabetes treatment. Elevated FA 14:0 levels in triglycerides may be associated with MASLD pathogenesis in type 2 diabetes.

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Abnormalities in plasma lipoproteins observed in patients with diabetes promote atherosclerosis. However, the association between various lipid species and classes and atherosclerosis remains unclear. Here, we aimed to identify the plasma lipid characteristics associated with atherosclerosis progression in patients with diabetes.

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Introduction: Despite the increasing number of studies using machine learning to develop individualized treatment strategies, only a few have been conducted in patients with type 1 diabetes. This study aimed to identify the characteristics of Japanese patients with type 1 diabetes, classified into subgroups using data-driven cluster analysis based on pancreatic beta-cell function, obesity, and glycemic control, and clarify the association between these subgroups and diabetic complications.

Materials And Methods: In this cross-sectional study, a cluster analysis using three variables (C-peptide, body mass index, and glycated hemoglobin) in 206 Japanese patients with type 1 diabetes was performed.

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Overt diabetes in pregnancy (ODP) was originally included in gestational diabetes mellitus, which was positioned between normal glucose tolerance and pre-existing diabetes mellitus (PDM) in perinatal risk. This retrospective study aimed to clarify the differences between women with ODP and those with PDM. Compared with women with PDM (n =  162), those with ODP (n = 76) had higher HbA1c levels especially in the first trimester (8.

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Aims/instruction: We previously demonstrated that sitagliptin, a dipeptidyl peptidase-4 (DPP-4) inhibitor, slowed down the progression of carotid atherosclerosis in type 2 diabetes participants who were treated with insulin and had no history of cardiovascular disease in the Sitagliptin Preventive study of Intima-Media Thickness Evaluation (SPIKE) trial. This was an extension of the SPIKE trial that examined if early sitagliptin initiation improved long-term cardiovascular outcomes.

Materials And Methods: In the SPIKE trial, 282 participants were randomized to either sitagliptin or conventional treatment to examine the effects of sitagliptin on carotid atherosclerosis.

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Aims: This study determined the association of the glycaemia risk index (GRI), a novel comprehensive metric derived from continuous glucose monitoring (CGM), and atherosclerosis in patients with type 2 diabetes (T2DM).

Methods: We evaluated the relationship between GRI and intima-media thickness (IMT), gray-scale median (GSM), tissue characteristics of the carotid artery wall, and brachial-ankle pulse wave velocity (baPWV), using baseline data from a multicenter prospective cohort study of 1000 Japanese patients with T2DM free of cardiovascular disease (CVD).

Results: The study subjects were 999 patients (age: 64.

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Aims/introduction: Metformin treatment for hyperglycemia in pregnancy (HIP) beneficially improves maternal glucose metabolism and reduces perinatal complications. However, metformin could impede pancreatic β cell development via impaired mitochondrial function. A new anti-diabetes drug imeglimin, developed based on metformin, improves mitochondrial function.

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Blood levels of hypoxanthine (HX) have been suggested as potential biomarkers associated with intramuscular metabolic dynamics in response to exercise. This pilot randomized crossover trial (UMIN000036520) aimed to investigate the changes in plasma HX after whole-body vibration exercise (WBVE) and their relationships with body composition and muscle-related parameters, enrolling eighteen healthy male volunteers. In the WBVE-alone intervention, the study subjects performed 20-min of WBVE.

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Article Synopsis
  • The study aimed to investigate the link between dietary potassium intake, sodium intake, and the incidence of cardiovascular disease (CVD) in Japanese patients with type 2 diabetes (T2DM).
  • Analysis of 1,477 participants over a median follow-up of 7 years revealed no significant correlation between high potassium intake and CVD events.
  • However, low potassium intake combined with high sodium intake was significantly associated with an increased risk of CVD in these individuals.
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Aim: To assess the direct effect of intensive glycaemic control on periodontal tissues in patients with diabetes mellitus.

Materials And Methods: Twenty-nine patients with type 2 diabetes were enrolled and hospitalized to receive a 2-week intensive glycaemic control regimen. We observed and analysed the systemic and oral disease indicators before and after treatment and clarified the indicators related to periodontal inflammation.

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Aims/introduction: The aim of the study was to evaluate the effects of tofogliflozin, a selective sodium-glucose cotransporter 2 inhibitor, on circulating levels of hepatic enzymes, uric acid and hemoglobin levels in patients with type 2 diabetes mellitus (T2DM).

Materials And Methods: We evaluated longitudinal changes in circulating aspartate aminotransferase (AST), alanine aminotransferase (ALT), gamma-glutamyl transpeptidase (γ-GTP), uric acid, and hemoglobin levels in tofogliflozin (n = 169) and conventional treatment groups (n = 170) using data obtained from the UTOPIA trial, a randomized prospective study conducted to evaluate the efficacy of tofogliflozin in preventing atherosclerosis.

Results: Within 104 weeks, tofogliflozin treatment, but not conventional treatment, significantly reduced AST, ALT, and γ-GTP levels.

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Article Synopsis
  • * Researchers tested 1,000 patients and found that those with lower chewing and motor skills had significantly higher rates of serious health issues over a median follow-up of about 36.6 months.
  • * Results showed a clear inverse relationship: better masticatory and tongue-lip function corresponded with lower incidences of adverse health events, such as death and diseases, highlighting the importance of oral motor skills in overall health for these patients.
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Aims/introduction: We aimed to evaluate factors that influence changes in blood low-density lipoprotein cholesterol (LDL-C) levels after treatment with sodium-glucose cotransporter 2 (SGLT2) inhibitors in Japanese patients with type 2 diabetes.

Materials And Methods: We retrospectively analyzed clinical data of outpatients newly initiated on SGLT2 inhibitors (n = 176) and other oral antidiabetic drugs (n = 227). The patients were classified into four subgroups according to statin administration and baseline LDL-C levels (<120 or ≥120 mg/dL).

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Aims/introduction: In 2021, the guidelines on gestational weight gain (GWG) were revised and increased by 2-3 kg in Japan. This study aimed to investigate whether the revised guidelines would increase the incidence of babies with excessive birth weight in mothers with diabetes.

Materials And Methods: This retrospective study included 369 deliveries of women with diabetes whose pre-pregnancy body mass index was below 30 kg/m between 1982 and 2021.

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Background: This study aimed to evaluate the changes in glycemic control and diabetic complications over time in Japanese patients with juvenile-onset type 1 diabetes mellitus and to clarify the factors associated with the progression of diabetic complications.

Methods: We tracked 129 patients with type 1 diabetes mellitus (21.8 ± 4.

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Article Synopsis
  • * 600 participants underwent CGM and carotid artery imaging at the start and after 104 weeks to assess changes in atherosclerosis, primarily measuring intima-media thickness (IMT) and grey-scale median (GSM).
  • * Results showed slight increases in mean IMT and thickened-lesion GSM over the study period, with significant associations found between baseline CGM-derived metrics (time in range and coefficient of variation) and changes in mean GSM over time.
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We previously reported in the study of preventive effects of alogliptin on diabetic atherosclerosis (SPEAD-A) that alogliptin, a dipeptidyl peptidase-4 (DPP-4) inhibitor, attenuated the progression of carotid atherosclerosis in subjects with type 2 diabetes and no history of cardiovascular disease. This extension study of the SPEAD-A trial investigated whether early alogliptin initiation improved long-term cardiovascular outcomes. The SPEAD-A trial randomized 341 subjects with type 2 diabetes to either alogliptin or conventional treatment to investigate the effects of alogliptin on atherosclerosis.

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Article Synopsis
  • This study evaluated the long-term impacts of tofogliflozin, an SGLT2 inhibitor, on atherosclerosis and key health markers in type 2 diabetes patients without cardiovascular disease.
  • Over a 2-year period, both tofogliflozin and conventional treatments reduced carotid intima-media thickness, but with no notable difference between the two groups.
  • Tofogliflozin showed advantages in improving blood sugar, cholesterol, BMI, waist circumference, and blood pressure compared to conventional treatment, while safety metrics were not significantly different between groups.
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Article Synopsis
  • - This study investigated how changing from injectable semaglutide to oral semaglutide affects daily blood sugar levels in patients with type 2 diabetes.
  • - After the switch, average glucose levels increased by 9 mg/dL, and there was greater variation in glucose levels among patients.
  • - Treatment satisfaction varied widely, with 48% of participants preferring the oral version, while 35% stuck with the injectable, and 17% had no preference.
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Article Synopsis
  • * Results showed that participants in the laughter yoga group had significant improvements in their hemoglobin A1c levels and positive emotional well-being, with a high attendance rate of 92.9%.
  • * The findings suggest that laughter yoga can be a feasible self-care intervention for diabetes management, although more extensive studies are needed for confirmation.
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Atherosclerosis is a life-threatening disease associated with morbidity and mortality in patients with type 2 diabetes (T2D). This study aimed to characterize a salivary signature of atherosclerosis based on evaluation of carotid intima-media thickness (IMT) to develop a non-invasive predictive tool for diagnosis and disease follow-up. Metabolites in saliva and plasma samples collected at admission and after treatment from 25 T2D patients hospitalized for 2 weeks to undergo medical treatment for diabetes were comprehensively profiled using metabolomic profiling with gas chromatography-mass spectrometry.

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This study investigated whether longer-acting basal analogs (insulin degludec and insulin glargine U300) could reduce visit-to-visit hemoglobin A1c (HbA1c) variability in patients with type 1 diabetes. Ninety adults with type 1 diabetes for whom the basal insulin was switched to a longer-acting insulin analog were analyzed retrospectively. The coefficient of variation of HbA1c levels (CV-HbA1c) during the year before and after the switch was compared.

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Aims/introduction: Hypertriglyceridemia is common in patients with diabetes. Although the fatty acid (FA) composition of triglycerides (TGs) is suggested to be related to the pathology of diabetes and its complications, changes in the fatty acid composition caused by diabetes treatment remain unclear. This study aimed to identify short-term changes in the fatty acid composition of plasma triglycerides after diabetes treatment.

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Aims/introduction: In addition to absolute insulin deficiency, dysregulated glucagon in type 1 diabetes is considered pathophysiologically important. Previously, we confirmed the presence of dysregulated glucagon in Japanese patients with type 1 diabetes, and found a significant correlation between plasma glucagon and blood urea nitrogen levels, suggesting an association between glucagon and amino acid metabolism. In this study, we evaluated plasma amino acid levels in Japanese patients with type 1 diabetes in the context of their functional relationship with glucagon.

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Context: Current guidelines recommend assessing glycemic control using continuous glucose monitoring (CGM) and hemoglobin A1c (HbA1c) measurement.

Objective: This study aimed to clarify the characteristics of patients who might benefit from CGM metrics in addition to HbA1c monitoring.

Methods: CGM metrics, specifically time in range (TIR), time below range (TBR), and time above range (TAR), were determined in 999 outpatients with type 2 diabetes and compared between HbA1c categories (HbA1c < 53 mmol/mol [7.

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