Roman Volinsky, Riku Paananen, Paavo K.J. Kinnunen Biophysical Journal

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Presentation transcript:

Oxidized Phosphatidylcholines Promote Phase Separation of Cholesterol- Sphingomyelin Domains Roman Volinsky, Riku Paananen, Paavo K.J. Kinnunen Biophysical Journal Volume 103, Issue 2, Pages 247-254 (July 2012) DOI: 10.1016/j.bpj.2012.06.017 Copyright © 2012 Biophysical Society Terms and Conditions

Figure 1 (A) Chemical structures of POPC and its oxidized analog, PazePC. (B) Compression isotherm of POPC (i) and PazePC (ii) at 25°C. Biophysical Journal 2012 103, 247-254DOI: (10.1016/j.bpj.2012.06.017) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 2 (A) Compression isotherms of Chol (i) and brain SM (ii) at 25°C. (B) BAM images recorded at the indicated surface pressures within the Chol isotherm ((i) 0, (ii) 10, and (iii) 47 m/Nm) and the SM isotherm ((iv) 10 and (v) 30 m/Nm). The bar represents 50 μm. Biophysical Journal 2012 103, 247-254DOI: (10.1016/j.bpj.2012.06.017) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 3 (A) Compression isotherms of (POPC + PazePC)/bSM/Chol mixtures (1.5/1.5/1 molar ratio). PazePC content in glycerophospholipid fraction increases (left to right) from 0.0, 12.5, 18.75, 25.0, 50.0 to 100% at 25°C. (B) Surface potentials of (POPC + PazePC)/bSM/Chol mixtures (1.5/1.5/1 molar ratio) with the indicated PazePC content within the glycerophospholipid fraction, which increases (bottom to top) from 0.0, 6.25, 12.5, 18.75, 25.0, and 50.0 to 100% at 25°C. Biophysical Journal 2012 103, 247-254DOI: (10.1016/j.bpj.2012.06.017) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 4 BAM images recorded at the indicated surface pressures within the POPC/bSM/Chol mixture isotherm ((i) 5 and (ii) 15 m/Nm) and the PazePC/bSM/Chol mixture isotherm ((iii) 5 m/Nm and (iv) 32 m/Nm). The bar represents 50 μm. Biophysical Journal 2012 103, 247-254DOI: (10.1016/j.bpj.2012.06.017) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 5 (A) Increase in miscibility transition surface pressures of (i) (POPC + PazePC)/bSM/Chol, (ii) (DMPC + PazePC)/bSM/Chol, and (iii) (DTPC + PazePC)/bSM/Chol monolayers (1.5/1.5/1 molar ratio) as a function of PazePC content within the glycerophospholipid fraction at 25°C. (B) BAM images recorded in the vicinity of the critical surface pressure (∼39 mN/m) within the DMPC/PazePC/bSM/Chol (34.5/3.0/37.5/25 molar ratio) mixture isotherm. Images i, ii, and iii are placed in order of appearance upon monolayer compression. The bar represents 50 μm. Biophysical Journal 2012 103, 247-254DOI: (10.1016/j.bpj.2012.06.017) Copyright © 2012 Biophysical Society Terms and Conditions