Expression and function of ATP-dependent potassium channels in zebrafish islet β-cells

Christopher H. Emfinger, Alecia Welscher, Zihan Yan, Yixi Wang, Hannah Conway, Jennifer B. Moss, Larry G. Moss, Maria S. Remedi, Colin G. Nichols

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

ATP-sensitive potassium channels (KATP channels) are critical nutrient sensors in many mammalian tissues. In the pancreas, KATP channels are essential for coupling glucose metabolism to insulin secretion. While orthologous genes for many components of metabolism–secretion coupling in mammals are present in lower vertebrates, their expression, functionality and ultimate impact on body glucose homeostasis are unclear. In this paper, we demonstrate that zebrafish islet β-cells express functional KATP channels of similar subunit composition, structure and metabolic sensitivity to their mammalian counterparts. We further show that pharmacological activation of native zebrafish KATP using diazoxide, a specific KATP channel opener, is sufficient to disturb glucose tolerance in adult zebrafish. That β-cell KATP channel expression and function are conserved between zebrafish and mammals illustrates the evolutionary conservation of islet metabolic sensing from fish to humans, and lends relevance to the use of zebrafish to model islet glucose sensing and diseases of membrane excitability such as neonatal diabetes.

Original languageEnglish
Article number160808
JournalRoyal Society Open Science
Volume4
Issue number2
DOIs
StatePublished - Feb 8 2017

Keywords

  • Ion channels
  • K
  • Metabolism
  • Pancreas
  • Zebrafish

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