Nov 6, 2018

Transmission of mechanical information by purinergic signaling

BioRxiv : the Preprint Server for Biology
Nicholas MikolajewiczSvetlana V Komarova

Abstract

The human skeleton constantly interacts and adapts to the physical world. We have previously reported that physiologically-relevant mechanical forces lead to small, repairable membrane injuries in bone-forming osteoblasts, resulting in the release of ATP and stimulation of purinergic (P2) calcium responses in neighbouring cells. The goal of this study was to develop a theoretical model describing injury-related ATP and ADP release, extracellular diffusion and degradation, and purinergic responses in neighboring cells. The model was validated using experimental data obtained by measuring intracellular free calcium ([Ca2+]i) elevations following mechanical stimulation of a single osteoblast. The validated single-cell injury model was then scaled to a tissue-level injury to investigate how purinergic responses communicate information about injuries with varying geometries. We found that total ATP released, peak extracellular ATP concentration and the ADP-mediated signaling component contributed complementary information regarding the mechanical stimulation event. The total amount of ATP released governed the maximal distance from the injury at which purinergic responses were stimulated, as well as the overall number of responders....Continue Reading

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Mentioned in this Paper

Study
Calcium [EPC]
Theoretical Model
Cell Injury
Extracellular
Mechanical Stimulation
Calcium
Protoplasm
Calcium ion
Hormone-mediated Signaling Pathway

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