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Mathematical model of early Reelin-induced Src family kinase-mediated signaling

Author

Listed:
  • Helge Hass
  • Friederike Kipkeew
  • Aziz Gauhar
  • Elisabeth Bouché
  • Petra May
  • Jens Timmer
  • Hans H Bock

Abstract

Reelin is a large glycoprotein with a dual role in the mammalian brain. It regulates the positioning and differentiation of postmitotic neurons during brain development and modulates neurotransmission and memory formation in the adult brain. Alterations in the Reelin signaling pathway have been described in different psychiatric disorders. Reelin mainly signals by binding to the lipoprotein receptors Vldlr and ApoER2, which induces tyrosine phosphorylation of the adaptor protein Dab1 mediated by Src family kinases (SFKs). In turn, phosphorylated Dab1 activates downstream signaling cascades, including PI3-kinase-dependent signaling. In this work, a mechanistic model based on ordinary differential equations was built to model early dynamics of the Reelin-mediated signaling cascade. Mechanistic models are frequently used to disentangle the highly complex mechanisms underlying cellular processes and obtain new biological insights. The model was calibrated on time-resolved data and a dose-response measurement of protein concentrations measured in cortical neurons treated with Reelin. It focusses on the interplay between Dab1 and SFKs with a special emphasis on the tyrosine phosphorylation of Dab1, and their role for the regulation of Reelin-induced signaling. Model selection was performed on different model structures and a comprehensive mechanistic model of the early Reelin signaling cascade is provided in this work. It emphasizes the importance of Reelin-induced lipoprotein receptor clustering for SFK-mediated Dab1 trans-phosphorylation and does not require co-receptors to describe the measured data. The model is freely available within the open-source framework Data2Dynamics (www.data2dynamics.org). It can be used to generate predictions that can be validated experimentally, and provides a platform for model extensions both to downstream targets such as transcription factors and interactions with other transmembrane proteins and neuronal signaling pathways.

Suggested Citation

  • Helge Hass & Friederike Kipkeew & Aziz Gauhar & Elisabeth Bouché & Petra May & Jens Timmer & Hans H Bock, 2017. "Mathematical model of early Reelin-induced Src family kinase-mediated signaling," PLOS ONE, Public Library of Science, vol. 12(10), pages 1-16, October.
    • Handle: RePEc:plo:pone00:0186927
    DOI: 10.1371/journal.pone.0186927
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    References listed on IDEAS

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