Examining the Effects of Hyperglycemia on Pancreatic Endocrine Function in Humans: Evidence for in Vivo Glucotoxicity

Thomas P J Solomon, Sine Haugaard Knudsen, Kristian Karstoft, Kamilla Winding, Jens Juul Holst, Bente K Pedersen

    45 Citationer (Scopus)

    Abstract

    Context:Investigating the impact of hyperglycemia on pancreatic endocrine function promotes our understanding of the pathophysiology of hyperglycemia-related disease.Objective:The objective of the study was to test the hypothesis that experimental hyperglycemia impairs insulin and glucagon secretion.Design:A randomized, crossover in healthy controls, compared with type 2 diabetic patients.Setting:The study was conducted at a university hospital.Participants:Normal glucose-tolerant subjects (n = 10) and patients with type 2 diabetes (n = 10), individually matched by age, sex, and body mass index.Interventions:Normal glucose-tolerant subjects underwent 24 h of experimental hyperglycemia (+5.4 mm above basal). Subjects with type 2 diabetes did not undergo an intervention.Main Outcome Measures:Insulin secretion, glucagon secretion, insulin sensitivity, disposition index, and endogenous glucose production (via [6,6-(2)H(2)]glucose infusion) were measured during hyperglycemic clamps combined with infusion of glucagon-like peptide (GLP)-1(7-36) (0.5 pmol/kg · min) and injection of arginine (5 g).Results:Insulin secretion was correlated with glucagon suppression in subjects with normal glucose tolerance only. Individuals with type 2 diabetes had lower insulin sensitivity (-33 ± 11%) and insulin secretory responses to glucose, GLP-1, and arginine (-40 ± 11, -58 ± 7, and -36 ± 13%, respectively) and higher plasma glucagon and endogenous glucose production compared with normal glucose-tolerant subjects (all P <0.05). After 24 h of experimental hyperglycemia, insulin sensitivity (-29 ± 10%), disposition index (-24 ± 16%), and GLP-1- (-19 ± 7%) and arginine-stimulated (-15 ± 10%) insulin secretion were decreased in normal glucose-tolerant subjects (all P <0.05). However, plasma glucagon responses were not affected. Furthermore, experimental hyperglycemia abolished the correlation between insulin secretion and glucagon suppression.Conclusions:Experimental hyperglycemia impaired pancreatic β-cell function but did not acutely impair α-cell glucagon secretion in normal glucose-tolerant subjects.
    OriginalsprogEngelsk
    TidsskriftJournal of Clinical Endocrinology and Metabolism
    Vol/bind97
    Udgave nummer12
    Sider (fra-til)4682-91
    ISSN0021-972X
    DOI
    StatusUdgivet - 2012

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