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1

Preliminary studies of phthalocyanine sensitizers incorporated into human leukemia cells from two cell-lines

100%
Wiktorowicz K., Cofta J., Dudkowiak A., Waszkowiak A., Frackowiak D.
Acta Biochimica Polonica
|
2004
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tom 51
|
nr 3
Three phthalocyanine dyes-sensitizers were incorporated into two types of human T leukemia cells from two cell-lines: CCRF and MOLT 4. The efficiency of the dye in­corporation into cells and photochemical properties of stained cells were investi­gated using fluorescence spectroscopy. The dyes exhibited different properties in each of the two cell-lines. Small differences in cell membrane properties have a strong influence on the efficiency of dye incorporation and on the course of photodynamic reaction. It is suggested that, for a given patient, an optimal dye-sensitizer should be established before photodynamic treatment.
2

Incorporation of stilbazolium merocyanines into resting and stimulated mononuclear leukocytes

100%
Frackowiak D., Wiktorowicz K., Cofta J., Niedbalska M., Latosinska M.
Acta Biochimica Polonica
|
1995
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tom 42
|
nr 1
Stimulated and resting mononuclear leukocytes were incubated with a stilbazolium merocyanine dye l-(6'-hydroxyhexyl)-4-[(4-oxocyclohexa-2,5-dienylidene)ethylide- ne]-l,4-dihydropyridine and immobilized in isotropic and stretched polyvinyl alcohol film. Polarized absorption, fluorescence and fluorescence excitation spectra were collected and the anisotropy of absorption and emission were calculated. Analysis of the spectra pointed to: i. the occurrence of perturbation of the membrane structure by incubation with the dye, and ii. influence of the blood serum addition, during the process of incubation with.the dye, on the efficiency of incorporation of merocyanine into the cells and the degree of the dye orientation in the membrane. A small fraction of the dye molecules introduced into resting cells was found oriented to a higher degree than a large fraction incorporated into stimulated cells. The incubation time longer than 15 min caused strong changes in the membrane structure both of the resting and stimulated cells.
3

The interactions of phthalocyanines with stimulated and resting human peripheral blood mononuclear cells

86%
Frackowiak D., Waszkowiak A., Manikowski H., Ion R. M., Cofta J., Wiktorowicz K.
Acta Biochimica Polonica
|
2001
|
tom 48
|
nr 1
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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