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TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
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Modularized Smad-regulated TGFβ signaling pathway.

Yongfeng Li1, Minli Wang, Claudio Carra

  • 1USRA, Division of Space Life Sciences, Houston, TX 77058, USA.

Mathematical Biosciences
|August 16, 2012
PubMed
Summary

This study models the transforming Growth Factor β (TGFβ) pathway, revealing how Smad proteins regulate cellular processes. The mathematical model confirms pathway excitability and robustness, crucial for understanding cellular responses.

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Area of Science:

  • Cellular Biology
  • Systems Biology
  • Biophysics

Background:

  • The transforming Growth Factor β (TGFβ) signaling pathway is a critical regulator of cellular functions.
  • TGFβ signaling is induced by stimuli like ionizing radiation and involves a negative feedback loop.
  • Key components include regulatory Smads, Smad7, and Smurf2, which target TGFβ receptors for degradation.

Purpose of the Study:

  • To develop a mathematical model for analyzing the Smad-regulated TGFβ signaling pathway.
  • To investigate the nonlinear dynamics and regulatory mechanisms within the TGFβ network.
  • To explore and validate the excitability property of the TGFβ signaling pathway.

Main Methods:

  • Proposed a modular mathematical modeling approach to dissect the TGFβ pathway.
  • Analyzed individual component subsystems mathematically.
  • Employed numerical simulations to study pathway dynamics and excitability.

Main Results:

  • The mathematical model successfully captured the nonlinear dynamics of the entire TGFβ signaling network.
  • Modular analysis facilitated a comprehensive understanding of pathway components.
  • Numerical simulations confirmed the presence of excitability in the TGFβ pathway, demonstrating model robustness.

Conclusions:

  • The developed mathematical model provides a robust framework for studying the TGFβ signaling pathway.
  • The findings highlight the significance of Smad regulation and pathway excitability in cellular processes.
  • This work contributes to a deeper understanding of how cells respond to external stimuli via TGFβ signaling.