Abstract
Purpose
The role of ATP, which is secreted by pancreatic β-cells, is still a matter of debate. It has been postulated that extracellular ATP acts as a positive auto- or paracrine signal in β-cells amplifying insulin secretion. However, there is rising evidence that extracellular ATP may also mediate a negative signal.
Methods
We evaluated whether extracellular ATP interferes with the Ca2+-mediated negative feedback mechanism that regulates oscillatory activity of β-cells.
Results
To experimentally uncover the Ca2+-induced feedback we applied a high extracellular Ca2+ concentration. Under this condition ATP (100 µM) inhibited glucose-evoked oscillations of electrical activity and hyperpolarized the membrane potential. Furthermore, ATP acutely increased the interburst phase of Ca2+ oscillations and reduced the current through L-type Ca2+ channels. Accordingly, ATP (500 µM) decreased glucose-induced insulin secretion. The ATP effect was not mimicked by AMP, ADP, or adenosine. The use of specific agonists and antagonists and mice deficient of large conductance Ca2+-dependent K+ channels revealed that P2X, but not P2Y receptors, and Ca2+-dependent K+ channels are involved in the underlying signaling cascade induced by ATP. The effectiveness of ATP to interfere with parameters of stimulus-secretion coupling is markedly reduced at low extracellular Ca2+ concentration.
Conclusion
It is suggested that extracellular ATP which is co-secreted with insulin in a pulsatile manner during glucose-stimulated exocytosis provides a negative feedback signal driving β-cell oscillations in co-operation with Ca2+ and other signals.
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Abbreviations
- V m :
-
cell membrane potential
- Δψ :
-
mitochondrial membrane potential
- [Ca2+]c :
-
cytosolic Ca2+ concentration
- BK-KO:
-
BK channel knock-out
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Acknowledgements
We are grateful to Isolde Breuning for excellent technical assistance. BK-KO mice were kindly provided by Prof. Dr. Peter Ruth, Institute of Pharmacy, University of Tübingen.
Author's contribution
C.B., J.K., and J.S. researched data; P.K.-D. evaluated data and edited the manuscript; M.D. contributed to discussion and study design and edited the manuscript; G.D. designed the study, wrote and edited the manuscript, and contributed to discussion. G.D. is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
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Bauer, C., Kaiser, J., Sikimic, J. et al. ATP mediates a negative autocrine signal on stimulus-secretion coupling in mouse pancreatic β-cells. Endocrine 63, 270–283 (2019). https://doi.org/10.1007/s12020-018-1731-0
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DOI: https://doi.org/10.1007/s12020-018-1731-0