中国物理B ›› 2010, Vol. 19 ›› Issue (10): 108202-108202.doi: 10.1088/1674-1056/19/10/108202

• • 上一篇    下一篇

Intrinsic noise analysis and stochastic simulation on transforming growth factor beta signal pathway

王路, 欧阳颀   

  1. The State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China; Center for Theoretical Biology, Peking University, Beijing 100871, China
  • 收稿日期:2010-04-21 修回日期:2010-06-10 出版日期:2010-10-15 发布日期:2010-10-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10721403), and the National Basic Research Program of China (Grant No. 2009CB918500).

Intrinsic noise analysis and stochastic simulation on transforming growth factor beta signal pathway

Wang Lu(王路)a)b) and Ouyang Qi(欧阳颀) a)b)†   

  1. The State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China; b Center for Theoretical Biology, Peking University, Beijing 100871, China
  • Received:2010-04-21 Revised:2010-06-10 Online:2010-10-15 Published:2010-10-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10721403), and the National Basic Research Program of China (Grant No. 2009CB918500).

摘要: A typical biological cell lives in a small volume at room temperature; the noise effect on the cell signal transduction pathway may play an important role in its dynamics. Here, using the transforming growth factor-β signal transduction pathway as an example, we report our stochastic simulations of the dynamics of the pathway and introduce a linear noise approximation method to calculate the transient intrinsic noise of pathway components. We compare the numerical solutions of the linear noise approximation with the statistic results of chemical Langevin equations, and find that they are quantitatively in agreement with the other. When transforming growth factor-β dose decreases to a low level, the time evolution of noise fluctuation of nuclear Smad2--Smad4 complex indicates the abnormal enhancement in the transient signal activation process.

Abstract: A typical biological cell lives in a small volume at room temperature; the noise effect on the cell signal transduction pathway may play an important role in its dynamics. Here, using the transforming growth factor-β signal transduction pathway as an example, we report our stochastic simulations of the dynamics of the pathway and introduce a linear noise approximation method to calculate the transient intrinsic noise of pathway components. We compare the numerical solutions of the linear noise approximation with the statistic results of chemical Langevin equations, and find that they are quantitatively in agreement with the other. When transforming growth factor-β dose decreases to a low level, the time evolution of noise fluctuation of nuclear Smad2–Smad4 complex indicates the abnormal enhancement in the transient signal activation process.

Key words: transforming growth factor-β, noise, chemical Langevin equation, linear noise approximation

中图分类号:  (Stochastic processes)

  • 02.50.Ey
87.15.N- (Properties of solutions of macromolecules) 87.15.Ya (Fluctuations) 87.16.A- (Theory, modeling, and simulations) 87.16.Xa (Signal transduction and intracellular signaling)