Interaction of cationic meso-porphyrins with liposomes, mitochondria and erythrocytes

Journal of bioenergetics - Tập 39 - Trang 175-185 - 2007
Fabio M. Engelmann1, Ildemar Mayer1, Dino S. Gabrielli1, Henrique E. Toma1, Alicia J. Kowaltowski1, Koiti Araki1,2, Mauricio S. Baptista1,2
1Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
2Departamento de Bioquímica, Instituto de Química-USP, São Paulo, Brazil

Tóm tắt

Two series of cationic porphyrins meso-(3N-methylpyridinium)phenylporphyrin (3P1, 3P2c, 3P2t, 3P3 and 3P4) and meso-(4N-methylpyridinium)phenylporphyrin (4P1, 4P2c, 4P2t, 4P3 and 4P4) were studied to obtain a comprehensive understanding of factors that influence the binding of cationic porphyrins to liposomes and mitochondria, as well as their photodynamic efficiencies in erythrocytes. Binding and photodynamic efficiency were found to be inversely proportional to the number of positively charged groups and directly proportional to n-octanol/water partition coefficients (log POW), except for the cis molecules 3P2c and 4P2c. In the cis molecules, binding and photodynamic efficiency were much higher than expected, indicating that specific interactions not accounted by log POW enhance photodynamic efficiency. The effect of mitochondrial transmembrane electrochemical potentials on cationic porphyrin binding constants was estimated to be as large as 15%, and may be useful to selectively target this organelle when promoting photodynamic therapy to induce apoptosis.

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