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. 1999 Apr;80(1-2):133–141. doi: 10.1038/sj.bjc.6690332

Evaluation of the effects of photodynamic therapy with phosphorus 31 magnetic resonance spectroscopy

M Nishiwaki 1,3, Y Fujise 2, T O Yoshida 1,2, E Matsuzawa 4, Y Nishiwaki 5
PMCID: PMC2363014  PMID: 10389989

Abstract

Magnetic resonance spectroscopy in situ was used to study changes in phosphorus 31 metabolism after photodynamic therapy (PDT) of transplanted HeLa cell tumours. Tumours were irradiated 2 h after administration of ATX-S10 (8-formyloximethylidene-7-hydroxy-3-ethenyl-2,7,12,18, tetramethyl-porphyrin-13,17-bispropionil aspartate), a new photosensitizer and chlorin derivative. Nuclear magnetic resonance spectra were measured prior to illumination and 1, 3, 7, 14, 21 and 28 days after PDT on each mouse. A drastic decrease in adenosine triphosphate (ATP) and a concomitant increase in inorganic phosphate (Pi) were evident on the first day after PDT in all cases. The β-ATP/total phosphate (P) ratio was 0.64 ± 0.29% (average ± s.d.) in complete response, 0.67 ± 0.30% in recurrence and 2.45 ± 0.93% in partial response. Comparison of this ratio to the histological findings revealed that the β-ATP/total P ratio reflects the HeLa cell tumours which survived PDT. In other words, partial response on the one hand was distinguished from complete response and recurrence on the other with this ratio 1 day after PDT (P < 0.05). In addition, the ratio of phosphomonoester (PME) to Pi rose beyond 1.0 when macroscopic recurrence occurred, while it stayed under 1.0 in complete response. This finding suggests that the recurrence of HeLa cell tumours can be detected by the PME/Pi ratio. © 1999 Cancer Research Campaign

Keywords: photodynamic therapy (PDT), phosphorus 31 magnetic resonance spectroscopy (31P MRS), YAG-optical parametric oscillator laser (YAG-OPO laser), ATX-S10, HeLa cell tumour

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Selected References

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