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The interactions of two metal-free phthalocyanines [(H2Pc) and Solar Pc (with four peripherical groups: SO2N(CH2CH2OH)2)] and of one metal substituted dye (CoPc) with resting and stimulated human peripheral blood mononuclear cells (PBMC) were compared. The absorption, fluorescence, photoacoustic and EPR spectra of both resting cells and cells stimulated by phytohaemagglutinin, incubated in dimethyl sulfoxide (DMSO) with very low or 95% water content and with or without dye addition, were measured. The fate of the light absorbed by the samples was investigated. It is known that singlet oxygen production is crucial for photodynamic action of dyes. Thermal deactivation and luminescence emission compete with this process, so investigation of these alternative paths of sensitizer deactivation provides information about photodynamic action. The incorporation of the investigated dyes into cells and the perturbation of the cell structure caused by the dyes, the incubation solvent and the activator were investigated by comparing the spectral properties of PBMC before and after stimulation and incubation. Incubation of the cells for 1 h in a solution of Solar Pc in 99.5% aqueous DMSO, resulted in an efficient dye incorporation which was highly selective. Solar Pc being introduced much more efficiently into stimulated cells than into resting cells.
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p.257-269,fig.
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- Poznan University of Technology, Nieszawska 13 A, 60-965 Poznan, Poland
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Bibliografia
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- 8.Monahan, A.R., Brado, J.A. & De Luca, A.F. (1972) The association of copper (II) vanadyl and zinc (II) 4, 4'', 4'', 4'" tetraalkylphthalocyanines dyes in benzene. J. Phys. Chem. 76, 1994-1996.
- 9.Rollmann, L.D. & Iwamoto, R.T. (1968) Electrochemistry, EPR and visible spectra of Co, Ni, Cu and metalphthalocyanines in DMSO. J. Am. Chem. Soc. 90, 1455-1463.
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- 13.Wiktorowicz, K., Niedbalska, M., Planner, A. & Frackowiak, D. (1995) Incorporation of stilbazolium merocyanines into human leukocytes measured by flow cytometry. Acta Biochim. Polon. 42, 333-338.
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- 16.Ducharm, D., Tessier, A. & Leblanc, R.M. (1979) Design and characteristics of a cell for photoacoustic spectroscopy of condensed matter. Rev. Sci. Instr. 50, 1461-1462.
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- 23.Anderson, C.Y., Freye, K., Tubesing, K.A., Ying-Syi Li, Kenney, M.E., Mukhtar, H. & Elmets, C.A. (1998) Comparative analysis of silicon phthalocyanine photosensitizers for in vivo photodynamic therapy of RIF-1 tumors in C3H mice. Photochem. Photobiol. 67, 332-336.
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- 26.Heintzelman, D.L., Lotan, R. & Richards- Kortum, R.R. (2000) Characterization of the autofluorescence of polymorphonuclear leukocytes, monocytes and cervical epithelial cancer cells for improved spectroscopic discrimination of inflammation from dysplasia. Photochem. Photobiol. 71, 327-332.
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Bibliografia
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bwmeta1.element.agro-article-c58ebd20-a891-4a6c-9c9d-6849cd02ee83