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Citation: LI Hong-Ying, BI Jian-Hong, MA Juan. Constructive Role of Internal Noise for the Detection of Weak Stimulation in a Coupled Biological Cell System[J]. Acta Physico-Chimica Sinica, ;2009, 25(07): 1327-1331. doi: 10.3866/PKU.WHXB20090717 shu

Constructive Role of Internal Noise for the Detection of Weak Stimulation in a Coupled Biological Cell System

1.
Department of Chemistry and Chemical Engineering, Hefei Teachers College, Hefei 230026, P. R. China

Received Date: 25 January 2009
Available Online: 28 April 2009

By constructing a mesoscopic stochastic model for intracellular calcium oscillations in coupled cell system, we investigated the influence of internal noise on the detection of weak stimulation using the chemical Langevin equation (CLE). We found that an optimal cell size V existed for a coupled cell chain length N and an optimal value of N existed for a given cell size V. At these values, the collective calcium oscillations showed the best performance, indicating the occurrence of“system size resonance (SSR)”or“internal noise stochastic resonance (INSR)”. And such a phenomenon was robust to the coupling strength. Living cells may have learned to exploit the internal noise to detect weak stimulation via the mechanism of INSR, and then encode information to specifically regulate distinct cellular functions. It is interesting to note that the optimal cell size is always present at V抑103 μm3, which is close to the real living cell size in vivo. Since the internal noise in living systems can not be ignored and the systems may often encounter weak stimulations, our findings might have significance for stimulation detecting processes in living systems.
- Calciumoscillation,
- Internal noise,
- Chemical Langevin equation,
- Stimulation detection
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