Computational evidence for multi-layer crosstalk between the cadherin-11 and PDGFR pathways

Area of Science:

• Stem cell biology
• Cell signaling
• Computational biology

Background:

• Cell surface receptors regulate human mesenchymal stem cell (hMSC) differentiation and self-renewal.
• Cadherin-11, a type II classical cadherin, influences hMSC fate commitment through interactions with other receptors.
• Platelet-derived growth factor receptors (PDGFRs) are hypothesized interaction partners of cadherin-11, with differential effects on PDGFR-α and PDGFR-β activity.

Purpose of the Study:

• To computationally model the interactions between cadherin-11 and PDGFRs in hMSCs.
• To investigate potential downstream crosstalk between signaling pathways initiated by these receptors.
• To predict the impact of receptor crosstalk on hMSC proliferation.

Main Methods:

• Development of a computational model representing experimentally validated interactions between cadherin-11, PDGFR-α, and PDGFR-β.
• Simulation of model to mimic cadherin-11 knockdown experiments.
• Analysis of downstream signaling activities and prediction of effects on cell proliferation.

Main Results:

• Cadherin-11 knockdown decreased hMSC proliferation, consistent with experimental findings.
• Model simulations indicated crosstalk between cadherin-11 and PDGFRs at the receptor level.
• Predictions suggest a novel downstream crosstalk layer involving β-catenin and ERK inhibitor proteins (e.g., DUSP1).

Conclusions:

• The study elucidates multi-level crosstalk between cadherin-11 and PDGFRs in hMSCs.
• A previously unrecognized downstream crosstalk mechanism between β-catenin and ERK inhibitors was identified.
• Findings enhance the understanding of how cell surface receptor interactions regulate hMSC proliferation.