Lipid domains in giant unilamellar vesicles and their correspondence with equilibrium thermodynamic phases: A quantitative fluorescence microscopy imaging approach Export

@article{citeulike:5629092, abstract = {We report a novel analytical procedure to measure the surface areas of coexisting lipid domains in giant unilamellar vesicles (GUVs) based on image processing of 3D fluorescence microscopy data. The procedure involves the segmentation of lipid domains from fluorescent image stacks and reconstruction of 3D domain morphology using active surface models. This method permits the reconstruction of the spherical surface of GUVs and determination of the area fractions of coexisting lipid domains at the level of single vesicles. Obtaining area fractions enables the scrutiny of the Lever rule along lipid phase diagram's tie lines, and to test whether or not the coexistence of lipid domains in GUVs correspond to equilibrium thermodynamic phases. The analysis was applied to DLPC/DPPC GUVs displaying coexistence of lipid domains. Our results confirm the Lever rule, demonstrating that the observed membrane domains correspond to equilibrium thermodynamic phases (i.e. solid ordered and liquid disordered phases). Additionally, the fact that the Lever rule is validated from 11 - 14 randomly selected GUVs per molar fraction indicates homogeneity in the lipid composition among the explored GUV populations. In conclusion, our study shows that GUVs are reliable model systems to perform equilibrium thermodynamic studies of membranes.}, author = {Fidorra, M. and Garcia, A. and Ipsen, J. H. and H\"{a}rtel, S. and Bagatolli, L. A.}, citeulike-article-id = {5629092}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.bbamem.2009.08.006}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0005273609002570}, day = {21}, doi = {10.1016/j.bbamem.2009.08.006}, issn = {00052736}, journal = {Biochimica et Biophysica Acta (BBA) - Biomembranes}, keywords = {fidorr09pdf, giant, liposome, microscope, phase}, month = {August}, posted-at = {2009-08-25 01:50:55}, priority = {2}, title = {Lipid domains in giant unilamellar vesicles and their correspondence with equilibrium thermodynamic phases: A quantitative fluorescence microscopy imaging approach}, url = {http://dx.doi.org/10.1016/j.bbamem.2009.08.006}, year = {2009} }

TY - JOUR ID - citeulike:5629092 L3 - citeulike-article-id:5629092 N2 - We report a novel analytical procedure to measure the surface areas of coexisting lipid domains in giant unilamellar vesicles (GUVs) based on image processing of 3D fluorescence microscopy data. The procedure involves the segmentation of lipid domains from fluorescent image stacks and reconstruction of 3D domain morphology using active surface models. This method permits the reconstruction of the spherical surface of GUVs and determination of the area fractions of coexisting lipid domains at the level of single vesicles. Obtaining area fractions enables the scrutiny of the Lever rule along lipid phase diagram's tie lines, and to test whether or not the coexistence of lipid domains in GUVs correspond to equilibrium thermodynamic phases. The analysis was applied to DLPC/DPPC GUVs displaying coexistence of lipid domains. Our results confirm the Lever rule, demonstrating that the observed membrane domains correspond to equilibrium thermodynamic phases (i.e. solid ordered and liquid disordered phases). Additionally, the fact that the Lever rule is validated from 11 - 14 randomly selected GUVs per molar fraction indicates homogeneity in the lipid composition among the explored GUV populations. In conclusion, our study shows that GUVs are reliable model systems to perform equilibrium thermodynamic studies of membranes. JF - Biochimica et Biophysica Acta (BBA) - Biomembranes SN - 00052736 TI - Lipid domains in giant unilamellar vesicles and their correspondence with equilibrium thermodynamic phases: A quantitative fluorescence microscopy imaging approach KW - fidorr09pdf KW - giant KW - liposome KW - microscope KW - phase AU - Fidorra, M AU - Garcia, A AU - Ipsen, JH AU - Härtel, S AU - Bagatolli, LA PY - 2009/08/21/ UR - http://dx.doi.org/10.1016/j.bbamem.2009.08.006 ER -