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Children's Health Research Institute, London, Ontario, Canada
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Children's Health Research Institute, London, Ontario, Canada
Department of Pediatrics, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
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. 2021 ). However, the mechanisms by which glucose deprivation alters IGFBP-1 phosphorylation is currently unknown. We hypothesized that AMPK (5′adenosine monophosphate-activated protein kinase), a key energy sensor, is activated by glucose deprivation
Departments of, Applied Biological Chemistry, Animal Sciences, The Chubu Institute for Advanced Studies, Department of Bioregulation, Organization for Interdisciplinary Research Projects, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
Departments of, Applied Biological Chemistry, Animal Sciences, The Chubu Institute for Advanced Studies, Department of Bioregulation, Organization for Interdisciplinary Research Projects, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
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Departments of, Applied Biological Chemistry, Animal Sciences, The Chubu Institute for Advanced Studies, Department of Bioregulation, Organization for Interdisciplinary Research Projects, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
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of insulin on glucose uptake in the muscle was more prominent in PF-fed rats than in those fed with a 12% casein diet (12C) as a control diet. These results led us to conclude that protein deprivation causes the sensitization of IRS1 to IR tyrosine
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pancreatic cells ( Johnston 1999 ). D-glucose deprivation can also induce the expression of genes such as heme oxygenase-1 ( Chang et al. 2002 ) and interleukin 6 ( Choi et al. 2013 ). Furthermore, in D-glucose-deprived cells, AMP-activated protein kinase
Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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Ghrelin Research Group, Australian Prostate Cancer Research Centre – Queensland, The Vancouver Prostate Centre, Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, Queensland 4059, Australia
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with prostate cancer progression, androgen deprivation therapy, the standard treatment for advanced prostate cancer, frequently gives rise to metabolic syndrome and insulin resistance, with hyperinsulinaemia, elevated fasting blood glucose and elevated
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The cellular mechanisms that lead to neuronal death following glucose deprivation are not known, although it is recognized that hypoglycemia can lead to perturbations in intracellular calcium ([Ca2+]i) levels. Recently, activation of A1 adenosine receptors (A1AR) has been shown to alter [Ca2+]i and promote neuronal death. Thus, we examined if A1AR activation contributes to hypoglycemia-induced neuronal injury using rat cortical neurons. First, we observed that hypoglycemia was associated with large increases in neuronal adenosine release. Next, decreased neuronal viability was seen with progressive reduction in glucose concentration (25, 6, 3, 0.75 and 0 mM). Using the calcium-sensitive dye, Fluo-3, we observed both acute and long-term changes in relative [Ca2+]i during hypoglycemic conditions. Demonstrating a role for adenosine in this process, both the loss in neuronal viability and the early changes in [Ca2+]i were reversed by treatment with A1AR antagonists (8-cyclopentyl, 1,3-dipropylxanthine; 9-chloro-2-(2-furyl)(1,2,4)-triazolo(1,5-c)quinazolin-5-amine; and N-cyclopentyl-9-methyladenine). We also found that hypoglycemia induced the expression of the pro-apoptotic enzyme, caspase-3, and that A1AR antagonism reversed hypoglycemia-induced caspase-3 activity. Collectively, these data show that hypoglycemia induces A1ARs activation leading to alterations in [Ca2+]i, which plays a prominent role in leading to hypoglycemia-induced neuronal death.
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%) and l -glutamine (1%). All culture reagents were purchased from Sigma–Aldrich. For studies on glucose deprivation, the cells were incubated in a glucose-free medium (R1383 and D5030, Sigma–Aldrich). For the experiments, growing cells were plated on
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kinase (AMPK) is a cellular energy sensor, activated under states of low cellular energy such as glucose deprivation ( Kahn et al . 2005 , Hardie et al . 2006 ). AMPK is also postulated to mediate hypothalamic glucose sensing. For instance, i
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-binding protein 1c ( Srebp1c ) and plays an important role in regulating fatty acid metabolism ( Wang et al . 2014 ). Our previous study indicated that dietary deprivation of leucine suppresses lipid accumulation in the liver by downregulating the expression of
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. 2002 ). We have reported that AG blocks oxygen–glucose deprivation-induced apoptosis by preventing mitochondrial depolarization (loss of ΔΨ M ) ( Chung et al. 2007 ). Therefore, we examined the effect of ghrelin gene products on ΔΨ M using JC-1
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response to oral glucose challenge ( Berney et al . 1997 , Reusens & Remacle 2001 ). We showed earlier that maternal micronutrient restriction increased body fat% especially the central adiposity, impaired plasma lipids, altered glucose tolerance