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Developmental Regulation of Glucosensing in Rat Adrenomedullary Chromaffin Cells: Potential Role of the KATP Channel

  • Simon LivermoreEmail author
  • Nikol A. Piskuric
  • Shaima Salman
  • Colin A. Nurse
Conference paper
  • 3.5k Downloads
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 758)

Abstract

During birth, when the maternal supply of glucose is occluded, there is a drastic fall in blood glucose in the newborn. This stimulus triggers the non-neurogenic release of catecholamines from adrenomedullary chromaffin cells, which restores blood glucose homeostasis. In this report we present preliminary data showing that glucosensing is present in neonatal chromaffin cells from adrenal slices but absent in chromaffin cells from juvenile slices. Moreover, we show that the aglycemia-evoked rise in intracellular Ca2+ is robust in neonatal chromaffin cells but blunted in juvenile chromaffin cells. Lastly, we show that the Kir6.2 subunit of the KATP channel, is upregulated in the adrenal medulla in juvenile animals providing a potential mechanism for the developmental regulation of glucosensing.

Keywords

Neonatal Chromaffin Amperometry Development Fura-2 Katp Catecholamines Western Aglycemia Glucose 

Notes

Acknowledgements

This work was supported by a Discovery grant from the Natural Sciences and Engineering Research Council of Canada (NSERC) and an operating grant from the Canadian Institutes of Health Research (CIHR; grant #12037) to CAN. SL and NAP were supported by an Ontario Graduate Scholarship and an NSERC Vanier Canada Graduate Scholarship, respectively.

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Simon Livermore
    • 1
    Email author
  • Nikol A. Piskuric
    • 1
  • Shaima Salman
    • 1
  • Colin A. Nurse
    • 1
  1. 1.Department of BiologyMcMaster UniversityHamiltonCanada

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