Journal
JOURNAL OF THROMBOSIS AND HAEMOSTASIS
Volume 18, Issue 2, Pages 485-496Publisher
WILEY
DOI: 10.1111/jth.14673
Keywords
GPVI; mathematical modelling; platelet; Syk
Categories
Funding
- British Heart Foundation [CH0/003, FS/15/71/31677, PG/16/20/32074, RG/13/18/30563, RG/15/2/31224]
- Academy of Medical Sciences [SBF002\1099]
- European Commission [766118]
- Deutsche Forschungsgemeinschaft [SFB/TR 240]
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Background Accurate protein quantification is a vital prerequisite for generating meaningful predictions when using systems biology approaches, a method that is increasingly being used to unravel the complexities of subcellular interactions and as part of the drug discovery process. Quantitative proteomics, flow cytometry, and western blotting have been extensively used to define human platelet protein copy numbers, yet for mouse platelets, a model widely used for platelet research, evidence is largely limited to a single proteomic dataset in which the total amount of proteins was generally comparatively higher than those found in human platelets. Objectives To investigate the functional implications of discrepancies between levels of mouse and human proteins in the glycoprotein VI (GPVI) signalling pathway using a systems pharmacology model of GPVI. Methods The protein copy number of mouse platelet receptors was determined using flow cytometry. The Virtual Platelet, a mathematical model of GPVI signalling, was used to determine the consequences of protein copy number differences observed between human and mouse platelets. Results and conclusion Despite the small size of mouse platelets compared to human platelets they possessed a greater density of surface receptors alongside a higher concentration of intracellular signalling proteins. Surprisingly the predicted temporal profile of Syk activity was similar in both species with predictions supported experimentally. Super resolution microscopy demonstrates that the spatial distribution of Syk is similar between species, suggesting that the spatial distribution of receptors and signalling molecules in activated platelets, rather than their copy number, is important for signalling pathway regulation.
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