Editorial Technical Support:
D. H. Diaz
M. A. Gomez
Editorial management and production:
SOLGRAF Editora email@example.com
Anielski A., Pfannes E. K. B., and Beta, C.
Many cellular processes involve the translocation of proteins from the cytosolic region to the cortex of the cell and vice versa. The dynamics of such processes is typically investigated by fluorescence imaging of GFP-labeled versions of these proteins. Quantitative analysis of the resulting fluorescence images requires image segmentation procedures that identify the cell within the image and subsequently divide the cell into a cytosolic and a cortical region to monitor the temporal evolution of the fluorescence signals within these parts of the cell separately. Here, we present an image segmentation protocol that we have developed for this type of data analysis. It consists of noise reduction, normalization, and thresholding steps to generate masks that define the cytosolic and the cortical regions of a cell. Based on these masks, the desired fluorescence signals can be extracted from the confocal microscopy images.
fluorescence microscopy, image processing, Dictyostelium.
 DORMANN D, LIBOTTE T, WEIJER CJ & BRETSCHNEIDER T. Simultaneous Quantification of Cell Motility and Protein-Membrane-Association Using Active Contours. Cell Motility and Specificity of Three cAMP Receptors in Dictyostelium. Journal of the Cytoskeleton, 52: 221-230.
 BOSGRAAF L, VAN HAASTERT PJM & BRETSCHNEIDER T.2009 Analysis of Cell Movement by Simultaneous Quantification of Local Membrane Displacement and Fluorescent Intensities Using Quimp2. Cell Motility and the Cytoskeleton, 66: 156-165.
 SCHNEIDER N, WEBER I, FAIX J, PRASSER J, MULLER-TAUBEN-BERGER A, KOHLER J, BURGHARDT E, GERISCH G & MARRIOTT G. 2003. A Lim Protein Involved in the Progression of Cytokine-sis and Regulation of the Mitotic Spindle. Cell Motility and the Cytoskeleton, 56: 130-139.
 OHNSON RL, VAN HAASTERT PJM, KIMMEL AR, SAXE III CL, JASTORFF B & DEVREOTES PN. 1992. The Cyclic Nucleotide Specificity of Three cAMP Receptors in Dictyostelium. Journal of Biological Chemistry, 267: 4600-4607.
 ETZRODT M, ISHIKAWA HCF, DALOUS J, MULLER-TAUBEN-BERGER A, BRETSCHNEIDER T & GERISCH G, 2006. Time-resolved responses to chemoattractant, characteristics of the front and tail of Dictyostelium cells. FEBS Letters, 580: 6707-6713.