The photosensitizing activity of haematoporphyrin on mollicutes.


The photosensitizing activity of haematoporphyrin (HP) on Mycoplasma hominis and Acholeplasma laidlawii was studied as a function of the phase of growth and the amount of sterols in the cell membrane. Less HP was bound to cells when the membrane had a high sterol content. Both strains in the exponential but not in the stationary phase of growth were sensitive to HP treatment (above 1 microgram ml-1) in the dark. Visible light irradiation of HP-loaded cells caused in all cases a decrease of cell survival, with concomitant changes in the pattern of membrane proteins that suggested protein-protein cross-linking, and the appearance of ultrastructural alterations (rounded and lysed cells); the photosensitivity was indirectly related to the sterol content of the cell membrane. On the whole, our findings suggest that the cell membrane is a major target for HP photosensitization of mycoplasma cells.


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@article{Bertoloni1985ThePA, title={The photosensitizing activity of haematoporphyrin on mollicutes.}, author={Giulio Bertoloni and Alain Viel and Anna Grossato and Giulio Jori}, journal={Journal of general microbiology}, year={1985}, volume={131 9}, pages={2217-23} }