Establishing the stochastic nature of intracellular calcium oscillations from experimental data

Matjaž Perc (Author), Anne K. Green (Author), C. Jane Dixon (Author), Marko Marhl (Author)

Abstract

Calcium has been established as a key messenger in both intra- and intercellular signaling. Experimentally observed intracellular calcium responses to different agonists show a variety of behaviors from simple spiking to complex oscillatory regimes. Here we study typical experimental traces of calcium oscillations in hepatocytes obtained in response to phenylephrine and ATP. The traces were analyzed with methods of nonlinear time series analysis in order to determine the stochastic/deterministic nature of the intracellular calcium oscillations. Despite the fact that the oscillations appear, visually, to be deterministic yet perturbed by noise, our analyses provide strong evidence that the measured calcium traces in hepatocytes are prevalently of stochastic nature. In particular, bursting calcium oscillations are temporally correlated Gaussian series distorted by a monotonic, instantaneous, time-independent function, whilst the spiking behavior appears to have a dynamical nonlinear component whereby the overall determinism level is still low. The biological importance of this finding is discussed in relation to the mechanisms incorporated in mathematical models as well as the role of stochasticity and determinism at cellular and tissue levels which resemble typical statistical and thermodynamic effects in physics.

Keywords

dinamični sistemi;stohastični procesi;celični sistemi;kalcijeve oscilacije;analize časovnih zaporedij;hrup;časovne korelacije;dynamic systems;stochastic processes;cellular signaling;calcium oscillations;time series analyses;noise;temporal correlation;

Data

Language:	English
Year of publishing:	2008
Typology:	1.01 - Original Scientific Article
Organization:	UM FNM - Faculty of Natural Sciences and Mathematics
UDC:	539.2:519.216
COBISS:	15744008
ISSN:	0301-4622
Views:	1400
Downloads:	114
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary keywords:	dinamični sistemi;stohastični procesi;celični sistemi;kalcijeve oscilacije;analize časovnih zaporedij;hrup;časovne korelacije;
URN:	URN:SI:UM:
Pages:	str. 33-38
Volume:	ǂVol. ǂ132
Issue:	ǂiss. ǂ1
Chronology:	2008
ID:	8724010