Hematoporphyrin derivative (Photofrin II) photosensitization of isolated mitochondria: impairment of anion translocation.

Isolated mitochondria have been incubated in the presence of 6 micrograms/ml hematoporphyrin derivative (Photofrin II), and irradiated at lambda = 365 nm. After 2 min irradiation (30 W/m2), a congruent to 50% inhibition of citric cycle intermediates transport is observed with a rather similar photosensitivity for the succinate, citrate or oxaloacetate carriers.