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  • Title: Coding of time-varying hormonal signals in intracellular calcium spike trains.
    Author: Prank K, Schöfl C, Läer L, Wagner M, von zur Mühlen A, Brabant G, Gabbiani F.
    Journal: Pac Symp Biocomput; 1998; ():633-44. PubMed ID: 9697218.
    Abstract:
    In a variety of cell types extracellular hormonal stimuli varying in time are transfered across the cell membrane into repetitive spikes of the intracellular calcium concentration ([Ca2+]i). Distinct temporal patterns of [Ca2+]i spikes are capable of regulating the function and structure of target cells. Here, we investigate the ability of transmembrane signaling to encode time-varying hormonal stimulations (bandlimited Gaussian white noise) in a model of receptor-controlled [Ca2+]i oscillations. The encoding of hormonal signals in [Ca2+]i spike trains is quantified by using an information-theoretic approach allowing to estimate the hormonal stimulus from [Ca2+]i spike trains. Our results suggest that intracellular [Ca2+]i spike trains convey faithful information on temporal variations of extracellular hormonal concentrations at scales of 30-200 sec, corresponding to cut-off frequencies between 5 and 30 mHz of the random hormonal stimulation.
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