Abstract
Accumulation of protoporphyrin IX (PpIX) in cancer cells is a basis of 5-aminolevulinic acid (ALA)-induced photodymanic therapy. We studied factors that affect PpIX accumulation in human urothelial carcinoma cell line T24, with particular emphasis on ATP-binding cassette transporter G2 (ABCG2) and serum in the medium. When the medium had no fetal bovine serum (FBS), ALA induced PpIX accumulation in a time- and ALA concentration-dependent manner. Inhibition of heme-synthesizing enzyme, ferrochelatase, by nitric oxide donor (Noc18) or deferoxamine resulted in a substantial increase in the cellular PpIX accumulation, whereas ABCG2 inhibition by fumitremorgin C or verapamil induced a slight PpIX increase. When the medium was added with FBS, cellular accumulation of PpIX stopped at a lower level with an increase of PpIX in the medium, which suggested PpIX efflux. ABCG2 inhibitors restored the cellular PpIX level to that of FBS(–) samples, whereas ferrochelatase inhibitors had little effects. Bovine serum albumin showed similar effects to FBS. Fluorescence microscopic observation revealed that inhibitors of ABC transporter affected the intracellular distribution of PpIX. These results indicated that ABCG2-mediated PpIX efflux was a major factor that prevented PpIX accumulation in cancer cells in the presence of serum. Inhibition of ABCG2 transporter system could be a new target for the improvement of photodynamic therapy.
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Abbreviations
- ABCG2:
-
ATP-binding cassette transporter G2
- ALA:
-
5-Aminolevulinic acid
- DFX:
-
Deferoxamine
- FBS:
-
Fetal bovine serum
- FTC:
-
Fumitremorgin C
- NAO:
-
10-Nonyl acridine orange
- Noc18:
-
1-Hydroxy-2-oxo-3,3-bis(2-aminoethyl)-1-triazene
- PBS:
-
Phosphate-buffered saline
- PDT:
-
Photodynamic therapy
- PI:
-
Propidium iodide
- PpIX:
-
Protoporphyrin IX
- SA:
-
Succinyl acetone
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Acknowledgments
The authors are grateful to Dr. Shigeru Taketani for providing ferrochelatase antibody. The authors are also grateful to Dr. Tohru Tanaka for the support of this investigation. This work was supported in part by grants from the Ministry of Education, Science and Culture of Japan.
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Ogino, T., Kobuchi, H., Munetomo, K. et al. Serum-dependent export of protoporphyrin IX by ATP-binding cassette transporter G2 in T24 cells. Mol Cell Biochem 358, 297–307 (2011). https://doi.org/10.1007/s11010-011-0980-5
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DOI: https://doi.org/10.1007/s11010-011-0980-5