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Abstract
This paper concerns a general study on the effects of hematoporphyrin-derivative (HpD) on mouse erythroleukemia (MEL) cells, in the absence of light irradiation. In particular, HpD intrinsic cytotoxicity was evaluated at different doses and the results correlated with those referring to membrane functional and morphological changes. HpD uptake and release processes were also studied and compared with the above-mentioned results. In order to have an overall picture of HpD-cell interactions, time-resolved fluorescence measurements were performed on both undifferentiated and differentiated MEL cells. The results obtained indicate that, even at HpD doses exhibiting neither any cytotoxicity nor any morphological damage (1–10 μg/ml), membrane permeability alterations are observed. Thirty minutes of treatment are sufficient for HpD to develop its toxic effect: indeed, no differences in HpD influence on cell viability can be observed after 30 min, 60 min or 5 days of treatment. HpD cytotoxicity is reduced by high protein content in the incubation culture medium. The presence of both monomeric species and 580 nm emitting species was observed at cellular level. The latter is likelier in undifferentiated MEL cells, which also exhibit higher overall HpD uptake, as compared with differentiated MEL cells.
Published Version
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