13(2)-hydroxy-bacteriopheophorbide a methyl ester pharmacokinetics measurements with fluorescence versus absorption spectroscopy. Is there a difference?
OBJECTIVE
Quantification of photosensitizer concentration in tissue improves the planning and, subsequently, the outcome of photodynamic therapy. This study was designed to determine if the method of photosensitizer evaluation influences the accuracy of pharmacokinetic results.


METHODS
In vivo 13(2)-Hydroxy-bacteriopheophorbide a methyl ester (13(2)-OH-BPME) pharmacokinetics in mice bearing LEWIS lung carcinoma was studied using fluorescence in situ and absorption spectroscopy (following photosensitizer chemical extraction) as photosensitizer quantification methods. The correlation of 13(2)-OH-BPME fluorescence intensity and its concentration using the absorption spectroscopy were determined for each tissue.


RESULTS
The parenchymatous organs showed maximum 13(2)-OH-BPME concentration and fluorescence intensity at 2 h post-injection (lung, liver, spleen), and at 2 h post-injection in the kidney with both quantification methods (identical correlation). There was a difference in the time of maximum photosensitizer fluorescence intensity and its concentration in tumor, muscle, and skin (low correlation). The time of maximum fluorescence intensity in muscle, skin, and tumor was at 4 h, 12 h, and 12 h post injection respectively while its maximum concentration was at 2 h, 4 h, and 8 h post-injection.


CONCLUSIONS
The method of photosensitizer evaluation affects the accuracy of its pharmacokinetic results.
Ismail
M S
MS
Department of Laser Medicine, Neukölln Hospital, Berlin, Germany.
Dressler
C
C
Röder
B
B
Berlien
H P
HP
D000818:Animals; D001429:Bacteriochlorophylls / Q000493:pharmacokinetics*; D018827:Carcinoma, Lewis Lung / Q000188:drug therapy* / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D007668:Kidney / Q000378:metabolism; D007834:Lasers; D008099:Liver / Q000378:metabolism; D008168:Lung / Q000378:metabolism; D008738:Methyl Ethers / Q000493:pharmacokinetics; D051379:Mice; D008815:Mice, Inbred Strains; D017319:Photosensitizing Agents / Q000493:pharmacokinetics*; D013050:Spectrometry, Fluorescence; D013054:Spectrophotometry, Atomic; D013154:Spleen / Q000378:metabolism; D014018:Tissue Distribution
C115111:13(2)-hydroxy-bacteriopheophorbide; D001429:Bacteriochlorophylls; D008738:Methyl Ethers; D017319:Photosensitizing Agents