Identification of plasma membrane macro- and microdomains from wavelet analysis of FRET microscopy.
In this study, we sought to characterize functional signaling domains by applying the multiresolution properties of the continuous wavelet transform to fluorescence resonance energy transfer (FRET) microscopic images of plasma membranes. A genetically encoded FRET reporter of protein kinase C (PKC)-dependent phosphorylation was expressed in COS1 cells. Differences between wavelet coefficient matrices revealed several heterogeneous domains (typically ranging from 1 to 5 microm), reflecting the dynamic balance between PKC and phosphatase activity during stimulation with phorbol-12,13-dibutyrate or acetylcholine. The balance in these domains was not necessarily reflected in the overall plasma membrane changes, and observed heterogeneity was absent when cells were exposed to a phosphatase or PKC inhibitor. Prolonged exposure to phorbol-12,13-dibutyrate and acetylcholine yielded more homogeneous FRET distribution in plasma membranes. The proposed wavelet-based image analysis provides, for the first time, a basis and a means of detecting and quantifying dynamic changes in functional signaling domains, and may find broader application in studying fine aspects of cellular signaling by various imaging reporters.
Kobrinsky
Evgeny
E
National Institute on Aging, National Institutes of Health, Baltimore, Maryland, USA.
Mager
Donald E
DE
Bentil
Sarah A
SA
Murata
Shin-Ichi
S
Abernethy
Darrell R
DR
Soldatov
Nikolai M
NM
D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry; D000818:Animals; D001426:Bacterial Proteins / Q000737:chemistry; D019556:COS Cells; D002462:Cell Membrane / Q000378:metabolism*; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods*; D017930:Genes, Reporter; D049452:Green Fluorescent Proteins / Q000737:chemistry; D007091:Image Processing, Computer-Assisted; D008164:Luminescent Proteins / Q000737:chemistry; D015233:Models, Statistical; D015240:Phorbol 12,13-Dibutyrate / Q000737:chemistry; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D010766:Phosphorylation; D011493:Protein Kinase C / Q000737:chemistry / Q000235:genetics; D017434:Protein Structure, Tertiary; D015398:Signal Transduction; D013997:Time Factors
D048868:Adaptor Proteins, Signal Transducing; D001426:Bacterial Proteins; C485182:Cyan Fluorescent Protein; D008164:Luminescent Proteins; C054562:yellow fluorescent protein, Bacteria; D049452:Green Fluorescent Proteins; D015240:Phorbol 12,13-Dibutyrate; D011493:Protein Kinase C; D010744:Phosphoric Monoester Hydrolases
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