Cited by 34Adenosine and Purinergic SignalingBone Metabolism and DiseasesCalcium signaling and nucleotide metabolism

UTP-induced ATP release is a fine-tuned signalling pathway in osteocytes

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Kringelbach, Tina M., Aslan, Derya, Novak, Ivana, Schwarz, Peter, Jørgensen, Niklas R.·2014·Purinergic Signalling

Abstract

Osteocytes reside as a cellular network throughout the mineralised matrix of bone and are considered the primary mechanosensors of this tissue. They sense mechanical stimulation such as fluid flow and are able to regulate osteoblast and osteoclast functions on the bone surface. Previously, we found that ATP is released load-dependently from osteocytes from the onset of mechanical stimulation. Therefore, the aim of the present study was to investigate whether and how ATP release can be evoked in osteocytes via purinergic receptor activation. ATP release was quantified by real-time determination using the luciferin-luciferase assay and the release pathway was investigated using pharmacological inhibition. The P2Y receptor profile was analysed using gene expression analysis by reverse transcription polymerase chain reaction, while functional testing was performed using measurements of intracellular calcium responses to P2 receptor agonists. These investigations demonstrated that MLO-Y4 osteocytes express functional P2Y(2), P2Y(4), P2Y(12) and P2Y(13) receptors in addition to the previously reported P2X receptors. Further, we found that osteocytes respond to nucleotides such as ATP, UTP and ADP by increasing the intracellular calcium concentration and that they release ATP dose-dependently upon stimulation with 1-10 μM UTP. In addition to this, osteocytes release large amounts of ATP upon cell rupture, which might also be a source for other nucleotides, such as UTP. These findings indicate that mechanically induced ATP signals may be propagated by P2 receptor activation and further ATP release in the osteocyte network and implicate purinergic signalling as a central signalling pathway in osteocyte mechanotransduction.

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Crossref · 10.1007/s11302-013-9404-1

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Authors
Kringelbach, T. M., Aslan, D., Novak, I., Schwarz, P., & Jørgensen, N. R.
Affiliations
  • Glostrup Hospital (DK)
  • University of Copenhagen (DK)
  • Hvidovre Hospital (DK)
Corresponding author
Jørgensen, Niklas R.
Venue
Purinergic Signalling
Published
2013-12-28
Volume
10
Issue
2
Pages
337-347
ISSN
  • 1573-9538 (ISSN-L)
  • 1573-9546
OpenAlex
W1989486586
Cited by
34
References
56
Citations by year
2026: 1 · 2025: 2 · 2024: 5 · 2023: 1 · 2022: 5 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 3
FWCI
2.49
Type
journal article
Language
en
Open access
Locations
  • Purinergic Signalling (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
Keywords
osteocytes, ATP release, UTP, purinergic receptors, P2Y receptors, P2X receptors, osteocyte mechanotransduction, intracellular calcium, MLO-Y4 cells, cell rupture
MeSH terms
Adenosine Triphosphate, Animals, Cell Line, Luminescent Measurements, Osteocytes, Uridine Triphosphate, Reverse Transcriptase Polymerase Chain Reaction, Mechanotransduction, Cellular, Mice, Receptors, Purinergic P2Y

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