Detecting effects of low levels of cytochalasin B in 3T3 fibroblast cultures by analysis of electrical noise obtained from cellular micromotion.
We performed micromotion experiments using electric cell-substrate impedance sensing (ECIS) on a confluent layer of 3T3 fibroblasts exposed to different low levels of the toxin cytochalasin B. This toxin is know to affect actin polymerization and to disrupt cytoskeletal structure and function in cells, changing the morphology of confluent cell cultures and altering the nature of the cellular micromotion, which is measured by ECIS as changes in impedance. By looking at several measures to characterize the long- and short-term correlations in the noise of the impedance time series, we are able to detect the effects of the toxin at concentrations down to 1 microM; there are intriguing hints that the effects may be discernible at levels as low as 0.1 microM. These measures include the power spectrum, the Hurst and detrended-fluctuation-analysis exponents, and the first zero and first 1/e crossings of the autocorrelation function. While most published work with ECIS uses only average impedance values, we demonstrate that noise analysis provides a more sensitive probe.
Lovelady
Douglas C
DC
Department of Physics, University of South Florida, Tampa, FL 33620, USA.
Friedman
Jennifer
J
Patel
Sonali
S
Rabson
David A
DA
Lo
Chun-Min
CM
D016475:3T3 Cells; D000818:Animals; D016477:Artifacts; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D003571:Cytochalasin B / Q000032:analysis*; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D051379:Mice; D009038:Motion; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D003571:Cytochalasin B