Photofrin-induced fluorescence in progressive and regressive murine colonic cancer cells: correlation with cell photosensitivity.
Microspectrofluorometry and fluorescence imaging were used to investigate the intracellular fluorescence of two murine colonic cancer cell lines--a progressive cell line (PROb) and a regressive cell line (REGb)--incubated with Photofrin. These two cell lines, which were initially cloned from the same chemically induced colonic murine cancer, differ in their metastatic properties and have been considered as models to mimic the tumoral cell heterogeneity. The fluorescence from cytoplasmic area of cells incubated with Photofrin appeared as a complex emission, with two maxima at 632 and 695 nm assigned to monomer species, and a poorly resolved band around 665 nm assigned to aggregates. The spectral distribution was shown to depend on the incubation time, with an aggregate contribution increasing for extended periods. The amount of Photofrin uptake, as determined from the total fluorescence intensity, was found for PROb to be twice that for REGb. However, the phototoxicities were quite similar for both cell lines, suggesting that drug concentration may not be the only determining factor in photobiological efficiency.
Blais
J
J
LPCB (Unité de Recherche associée au CNRS 198), Institut Curie, Paris, France.
Amirand
C
C
Ballini
J P
JP
Debey
P
P
Foultier
M T
MT
Patrice
T
T
D000818:Animals; D003110:Colonic Neoplasms / Q000378:metabolism*; D017324:Hematoporphyrin Derivative / Q000493:pharmacokinetics*; D007834:Lasers; D051379:Mice; D015591:Microspectrophotometry / Q000295:instrumentation; D010778:Photochemotherapy; D013997:Time Factors; D014407:Tumor Cells, Cultured
D017324:Hematoporphyrin Derivative