scholarly journals Impaired insulin secretion and related factors in East Asian individuals

2021 ◽  
Author(s):  
Akinobu Nakamura ◽  
Yasuo Terauchi
Keyword(s):  
Insulin Secretion ◽  
East Asian ◽  
Related Factors ◽  
Impaired Insulin Secretion ◽  
Impaired Insulin

1516-P: A Comparison of the Contributions of Impaired Insulin Secretion and Insulin Resistance to the Development of Type 2 Diabetes in a Japanese Community: The Hisayama Study

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 1516-P
Author(s):  
MASAHITO YOSHINARI ◽  
YOICHIRO HIRAKAWA ◽  
JUN HATA ◽  
MAYU HIGASHIOKA ◽  
TAKANORI HONDA ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Type 2 Diabetes ◽  
Insulin Secretion ◽  
Impaired Insulin Secretion ◽  
Impaired Insulin

scholarly journals The Possible Mechanisms of the Impaired Insulin Secretion in Hypothyroid Rats

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0131198 ◽  
Author(s):  
Aliashraf Godini ◽  
Asghar Ghasemi ◽  
Saleh Zahediasl
Keyword(s):  
Insulin Secretion ◽  
Impaired Insulin Secretion ◽  
Impaired Insulin

scholarly journals CFTR potentiator therapy ameliorates impaired insulin secretion in CF patients with a gating mutation

2016 ◽  
Vol 15 (3) ◽  
pp. e25-e27 ◽  
Author(s):  
Reuven Tsabari ◽  
Hila Iron Elyashar ◽  
Malena Cohen Cymberknowh ◽  
Oded Breuer ◽  
Shoshana Armoni ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Impaired Insulin Secretion ◽  
Impaired Insulin

scholarly journals Impaired Insulin Secretion by Diphenyleneiodium Associated with Perturbation of Cytosolic Ca2+ Dynamics in Pancreatic β-Cells

Endocrinology ◽  
2008 ◽  
Vol 149 (11) ◽  
pp. 5391-5400 ◽  
Author(s):  
Hirofumi Imoto ◽  
Nobuhiro Sasaki ◽  
Masanori Iwase ◽  
Udai Nakamura ◽  
Miwako Oku ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Nadph Oxidase ◽  
Nicotinamide Adenine Dinucleotide Phosphate ◽  
Mitochondrial Respiratory Chain ◽  
Membrane Depolarization ◽  
Oxidase Inhibitor ◽  
Channel Blockers ◽  
Β Cells ◽  
Impaired Insulin Secretion ◽  
Impaired Insulin

Pancreatic islets express the superoxide-producing nicotinamide adenine dinucleotide phosphate (NADPH) oxidase system, but its role remains unknown. To address this, we studied the mechanisms of impaired insulin secretion induced by diphenyleneiodium (DPI), an NADPH oxidase inhibitor. We investigated the effects of DPI on glucose- and nonfuel-stimulated insulin secretion, islet glucose metabolism, and intracellular Ca2+ concentration ([Ca2+]i) dynamics in rat islets and β-cell line RINm5F cells. DPI did not affect insulin secretion at 3.3 mm glucose but totally suppressed insulin secretion stimulated by 16.7 mm glucose (percentage of control, 9.2 ± 1.2%; P <0.001). DPI also inhibited insulin release by high K+-induced membrane depolarization (percentage of control, 36.0 ± 5.3%; P <0.01) and protein kinase C activation (percentage of control, 30.2 ± 10.6% in the presence of extracellular Ca2+, P <0.01; percentage of control, 42.0 ± 4.7% in the absence of extracellular Ca2+, P <0.01). However, DPI had no effect on mastoparan-induced insulin secretion at 3.3 and 16.7 mm glucose under Ca2+-free conditions. DPI significantly suppressed islet glucose oxidation and ATP content through its known inhibitory action on complex I in the mitochondrial respiratory chain. On the other hand, DPI altered [Ca2+]i dynamics in response to high glucose and membrane depolarization, and DPI per se dose-dependently increased [Ca2+]i. The DPI-induced [Ca2+]i rise was associated with a transient increase in insulin secretion and was attenuated by removal of extracellular Ca2+, by L-type voltage-dependent Ca2+ channel blockers, by mitochondrial inhibitors, or by addition of 0.1 or 1.0 μm H2O2 exogenously. Our results showed that DPI impairment of insulin secretion involved altered Ca2+ signaling, suggesting that NADPH oxidase may modulate Ca2+ signaling in β-cells.

scholarly journals Fasting Blood Glucose Predicts Incidence of Hypertension Independent of HbA1c Levels and Insulin Resistance in Middle-Aged Japanese: The Saku Study

2019 ◽  
Vol 32 (12) ◽  
pp. 1178-1185 ◽  
Author(s):  
Yukako Tatsumi ◽  
Akiko Morimoto ◽  
Kei Asayama ◽  
Nao Sonoda ◽  
Naomi Miyamatsu ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Blood Pressure ◽  
Insulin Secretion ◽  
Blood Glucose ◽  
Fasting Blood Glucose ◽  
Model Assessment ◽  
Middle Aged ◽  
Impaired Insulin Secretion ◽  
Impaired Insulin ◽  
Hba1c Levels

Abstract BACKGROUND Relationships between blood glucose (BG) levels and insulin action, and incidence of hypertension have not been well known epidemiologically. This study aimed to investigate the association between indices of diabetes and the incidence of hypertension and compare the predictive powers of these indices in middle-aged Japanese. METHODS This 5-year cohort study included 2,210 Japanese aged 30–64 years without hypertension. Hazard ratios of high fasting blood glucose (FBG) levels, high post-loaded BG levels, high glycated hemoglobin (HbA1c) levels, insulin resistance (defined by homeostasis model assessment of insulin resistance [HOMA-IR]) and impaired insulin secretion at baseline for the incidence of hypertension were estimated using multivariable-adjusted Cox proportional hazard models. Hypertension was defined as blood pressure ≥ 140/90 mm Hg or receiving antihypertensive treatment. RESULTS During the follow-up, 456 participants developed hypertension. After adjustment for HbA1c and HOMA-IR, FBG was independently and significantly associated with hypertension. The hazard ratio of participants with FBG ≥ 7.0 mmol/l was 1.79 compared with those with FBG < 5.6 mmol/l. Even among those with HbA1c < 6.5%, HOMA-IR < 2.5, body mass index < 25 kg/m2, age < 55 years old, blood pressure < 130/80 mm Hg or non- and moderate drinking, the results were similar. High 120-minute BG level and impaired insulin secretion did not increase the risk for hypertension. CONCLUSIONS FBG was a predictable index for future incidence of hypertension in middle-aged Japanese men and women. This is the first study comparing predictive powers of indices of diabetes for the incidence of hypertension.

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