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Добірка наукової літератури з теми "Cardioautonomic function, beta cell insulin secretion, type 2 diabetes"
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Статті в журналах з теми "Cardioautonomic function, beta cell insulin secretion, type 2 diabetes"
1
Khin, Phyu Phyu, Jong Han Lee, and Hee-Sook Jun. "Pancreatic Beta-cell Dysfunction in Type 2 Diabetes." European Journal of Inflammation 21 (January 30, 2023): 1721727X2311541. http://dx.doi.org/10.1177/1721727x231154152.
Повний текст джерелаАнотація:
Pancreatic β-cells produce and secrete insulin to maintain blood glucose levels within a narrow range. Defects in the function and mass of β-cells play a significant role in the development and progression of diabetes. Increased β-cell deficiency and β-cell apoptosis are observed in the pancreatic islets of patients with type 2 diabetes. At an early stage, β-cells adapt to insulin resistance, and their insulin secretion increases, but they eventually become exhausted, and the β-cell mass decreases. Various causal factors, such as high glucose, free fatty acids, inflammatory cytokines, and islet amyloid polypeptides, contribute to the impairment of β-cell function. Therefore, the maintenance of β-cell function is a logical approach for the treatment and prevention of diabetes. In this review, we provide an overview of the role of these risk factors in pancreatic β-cell loss and the associated mechanisms. A better understanding of the molecular mechanisms underlying pancreatic β-cell loss will provide an opportunity to identify novel therapeutic targets for type 2 diabetes.
2
Masoodi, Shariq Rashid. "Decline in Beta-Cell Function among Adolescents with Type 2 Diabetes Mellitus." JMS SKIMS 20, no. 2 (2017): 115–16. http://dx.doi.org/10.33883/jms.v20i2.211.
Повний текст джерелаАнотація:
It is well known that beta-cell function declines over time in adults with type 2 diabetes mellitus (T2DM). The beta-cell dysfunction, initially characterized by impairment in the first phase of insulin secretion following glucose stimulation, advances to a decline in second phase insulin secretion as the disease progresses. But whether this decline in beta-cell function occurs in adolescents with T2DM is uncertain. Investigators prospectively compared beta-cell functioning over time between 39 adolescents with newly diagnosed T2DM (mean age, 15 years; body-mass index z-score, 2.4) and 32 obese adolescents without T2DM of comparable body-mass index, gender, and race (mean age, 14) during a 2-year period. Recently, researchers from Duke University School of Medicine, Durham North Carolina reported that adolescents with newly diagnosed T2DM had a 25% annual decline in beta-cell function despite receiving treatment. In this study, the results of which were first presented at the American Diabetes Association (ADA), the participants were adolescents with T2DM, more than half of whom were being treated with insulin whereas 80% were taking oral anti-diabetes medications. Beta-cell function in this study, assessed at baseline and 6, 12, and 24 months was measured by insulin secretion in response to an intravenous glucose load adjusted for insulin sensitivity (disposition index). The authors observed that adolescents with T2DM had significantly higher levels of both insulin resistance and fasting glucose at baseline compared with controls. But during the two-year study, the study subjects experienced a significant increase in fasting glucose and a 25 percent annual decline in disposition index. Understandably, both these indicators remained unchanged among the controls. JMS 2017;20(2):116
3
Yan, Li-hui, Biao Mu, Da Pan, et al. "Association between small intestinal bacterial overgrowth and beta-cell function of type 2 diabetes." Journal of International Medical Research 48, no. 7 (2020): 030006052093786. http://dx.doi.org/10.1177/0300060520937866.
Повний текст джерелаАнотація:
Aims Previous studies suggest that small intestinal bacterial overgrowth (SIBO) is associated with type 2 diabetes. However, few studies have evaluated the association between SIBO and beta-cell function in type 2 diabetes. The aim of this study was to evaluate whether beta-cell function was associated with SIBO. Materials and methods One hundred four patients with type 2 diabetes were included in this study. Based on the presence of SIBO, the patients were divided into SIBO-positive and SIBO-negative groups. Oral glucose tolerance tests were performed. Insulin sensitivity was measured using 1/homeostasis model assessment of insulin resistance (1/HOMA-IR) and the insulin sensitivity index (ISIM). Insulin release was calculated by HOMA-β, early-phase insulin secretion index InsAUC30/GluAUC30, and total-phase insulin secretion index InsAUC120/GluAUC120. Results Compared with the SIBO-negative group, patients in the SIBO-positive group showed a higher glucose level at 120 minutes, HbA1c, 1/HOMA-IR, and ISIM and a lower HOMA-β level, early-phase InsAUC30/GluAUC30, and total-phase InsAUC120/GluAUC120. Multiple linear regression analysis showed that body mass index, glucose at 0 minutes, and SIBO were independently associated with the early-phase and total-phase insulin secretion. Conclusion SIBO may be involved in lower levels of insulin release and worse glycemic control.
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Popovic, Ljiljana, Miroslava Zamaklar, Katarina Lalic, and Olga Vasovic. "Analysis of the effect of diabetes type 2 duration on beta cell secretory function and insulin resistance." Srpski arhiv za celokupno lekarstvo 134, no. 5-6 (2006): 219–23. http://dx.doi.org/10.2298/sarh0606219p.
Повний текст джерелаАнотація:
Diabetes type 2 is a chronic metabolic disorder. Pathogenesis of diabetes type 2 results from the impaired insulin secretion, impaired insulin action and increased endogenous glucose production. Diabetes evolves through several phases characterized by qualitative and quantitative changes of beta cell secretory function. The aim of our study was to analyze the impact of diabetes duration on beta cell secretory function and insulin resistance. The results indicated significant negative correlation of diabetes duration and fasting insulinemia, as well as beta cell secretory function assessed by HOMA ? index. Our study also found significant negative correlation of diabetes duration and insulin resistance assessed by HOMA IR index. Significant positive correlation was established between beta cell secretory capacity (fasting insulinemia and HOMA ?) and insulin resistance assessed by HOMA IR index, independently of diabetes duration. These results indicate that: beta cell secretory capacity, assessed by HOMA ? index, significantly decreases with diabetes duration. In parallel with decrease of fasting insulinemia, reduction of insulin resistance assessed by HOMA IR index was found as well.
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Konenkov, Vladimir Iosifovich, Vadim Valerievich Klimontov, Svetlana Viktorovna Michurina, M. A. Prudnikova, and I. Ju Ishenko. "Melatonin and diabetes: from pathophysiology to the treatment perspectives." Diabetes mellitus 16, no. 2 (2013): 11–16. http://dx.doi.org/10.14341/2072-0351-3751.
Повний текст джерелаАнотація:
Pineal hormone melatonin synchronizes insulin secretion and glucose homeostasis with solar periods. Misalliance between melatonin-mediated circadian rhythms and insulin secretion characterizes diabetes mellitus type 1 (T1DM) and type 2 (T2DM). Insulin deficiency in T1DM is accompanied by increased melatonin production. Conversely, T2DM is characterized by diminished melatonin secretion. In genome-wide association studies the variants of melatonin receptor MT2 gene (rs1387153 and rs10830963) were associated with fasting glucose, beta-cell function and T2DM. In experimental models of diabetes melatonin enhanced beta-cell proliferation and neogenesis, improved insulin resistance and alleviated oxidative stress in retina and kidneys. However, further investigation is required to assess the therapeutic value of melatonin in diabetic patients.
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Shvarts, V. "Inflammation of adipose tissue. Part 2. Pathogenetic role in type 2 diabetes mellitus." Problems of Endocrinology 55, no. 5 (2009): 43–48. http://dx.doi.org/10.14341/probl200955543-48.
Повний текст джерелаАнотація:
This review deals with the role of adipose tissue inflammation (ATI) in the development of type 2 diabetes mellitus (DM2). ATI is regarded as a link between obesity and DM2. The review illustrates the involvement of main adipokines in pathogenesis of DM2 and provides a detailed description of such factors as impaired adiponectin and stimulation of cytokine production responsible for metabolic disorders, activation of lipolysis, in adipocytes, increased fatty acid and triglyceride levels, suppression of insulin activity at the receptor and intracellular levels. Adipokines, in the first place cytokines, act on the insulin signal pathway and affect the intracellular inflammatory kinase cascade. At the intercellular level, ATI stimulates JNK and IKK-beta/kB responsible for the development of insulin resistance via such mechanisms as activation of cytokine secretion in the adipose tissue, oxidative stress, and induction of endoplasmic reticulum enzymes. The key role of JNK and IKK-beta/kB in the inhibition of the insulin signal pathway is mediated through inactivation of insulin receptor substrate 1. Also, it is shown that ATI modulates B-cell function and promotes progressive reduction of insulin secretion.
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Makaji, Emilija, Sandeep Raha, Michael G. Wade, and Alison C. Holloway. "Effect of Environmental Contaminants on Beta Cell Function." International Journal of Toxicology 30, no. 4 (2011): 410–18. http://dx.doi.org/10.1177/1091581811405544.
Повний текст джерелаАнотація:
There is an increasing concern that chemicals in the environment are contributing to the global rise in the prevalence of type 2 diabetes (T2D). However, there is limited evidence for direct effects of these chemicals on beta cell function. Therefore, the goals of this study were (1) to test the hypothesis that environmental contaminants can directly affect beta cell function and (2) examine mechanistic pathways by which these contaminants could affect beta cell function. Using mouse beta TC-6 cells, we examined the acute effects of 6 substances (benzo[a]pyrene, bisphenol A [BPA], propylparaben, methylparaben, perfluorooctanoic acid, and perfluorooctyl sulfone) on insulin secretion. Only BPA treatment directly affected insulin secretion. Furthermore, chronic exposure to BPA altered the expression of key proteins in the cellular and endoplasmic reticulum stress response. These data suggest that long-term BPA exposure may be detrimental to beta cell function and ultimately be an important contributor to the etiology of T2D.
8
Tarlton, Jamie M. R., Steven Patterson, and Annette Graham. "MicroRNA Sequences Modulated by Beta Cell Lipid Metabolism: Implications for Type 2 Diabetes Mellitus." Biology 10, no. 6 (2021): 534. http://dx.doi.org/10.3390/biology10060534.
Повний текст джерелаАнотація:
Alterations in lipid metabolism within beta cells and islets contributes to dysfunction and apoptosis of beta cells, leading to loss of insulin secretion and the onset of type 2 diabetes. Over the last decade, there has been an explosion of interest in understanding the landscape of gene expression which influences beta cell function, including the importance of small non-coding microRNA sequences in this context. This review sought to identify the microRNA sequences regulated by metabolic challenges in beta cells and islets, their targets, highlight their function and assess their possible relevance as biomarkers of disease progression in diabetic individuals. Predictive analysis was used to explore networks of genes targeted by these microRNA sequences, which may offer new therapeutic strategies to protect beta cell function and delay the onset of type 2 diabetes.
9
Kim, Yong Kyung, Lori Sussel, and Howard W. Davidson. "Inherent Beta Cell Dysfunction Contributes to Autoimmune Susceptibility." Biomolecules 11, no. 4 (2021): 512. http://dx.doi.org/10.3390/biom11040512.
Повний текст джерелаАнотація:
The pancreatic beta cell is a highly specialized cell type whose primary function is to secrete insulin in response to nutrients to maintain glucose homeostasis in the body. As such, the beta cell has developed unique metabolic characteristics to achieve functionality; in healthy beta cells, the majority of glucose-derived carbons are oxidized and enter the mitochondria in the form of pyruvate. The pyruvate is subsequently metabolized to induce mitochondrial ATP and trigger the downstream insulin secretion response. Thus, in beta cells, mitochondria play a pivotal role in regulating glucose stimulated insulin secretion (GSIS). In type 2 diabetes (T2D), mitochondrial impairment has been shown to play an important role in beta cell dysfunction and loss. In type 1 diabetes (T1D), autoimmunity is the primary trigger of beta cell loss; however, there is accumulating evidence that intrinsic mitochondrial defects could contribute to beta cell susceptibility during proinflammatory conditions. Furthermore, there is speculation that dysfunctional mitochondrial responses could contribute to the formation of autoantigens. In this review, we provide an overview of mitochondrial function in the beta cells, and discuss potential mechanisms by which mitochondrial dysfunction may contribute to T1D pathogenesis.
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Grubelnik, Vladimir, Jan Zmazek, Rene Markovič, Marko Gosak, and Marko Marhl. "Mitochondrial Dysfunction in Pancreatic Alpha and Beta Cells Associated with Type 2 Diabetes Mellitus." Life 10, no. 12 (2020): 348. http://dx.doi.org/10.3390/life10120348.
Повний текст джерелаАнотація:
Type 2 diabetes mellitus is a complex multifactorial disease of epidemic proportions. It involves genetic and lifestyle factors that lead to dysregulations in hormone secretion and metabolic homeostasis. Accumulating evidence indicates that altered mitochondrial structure, function, and particularly bioenergetics of cells in different tissues have a central role in the pathogenesis of type 2 diabetes mellitus. In the present study, we explore how mitochondrial dysfunction impairs the coupling between metabolism and exocytosis in the pancreatic alpha and beta cells. We demonstrate that reduced mitochondrial ATP production is linked with the observed defects in insulin and glucagon secretion by utilizing computational modeling approach. Specifically, a 30–40% reduction in alpha cells’ mitochondrial function leads to a pathological shift of glucagon secretion, characterized by oversecretion at high glucose concentrations and insufficient secretion in hypoglycemia. In beta cells, the impaired mitochondrial energy metabolism is accompanied by reduced insulin secretion at all glucose levels, but the differences, compared to a normal beta cell, are the most pronounced in hyperglycemia. These findings improve our understanding of metabolic pathways and mitochondrial bioenergetics in the pathology of type 2 diabetes mellitus and might help drive the development of innovative therapies to treat various metabolic diseases.