Abstract
The purpose of this study was to investigate the potential use of 5-aminolevulinic acid (5-ALA, 5-amino-4-oxovaleric acid) induced protoporphyrin IX (PPIX) for photodynamic therapy (PDT) of nasopharyngeal carcinoma (NPC) and its related mechanisms of inducing cell death. PPIX biosynthesis at 1 to 8 h after incubation of a cultured NPC cell line (HNE1) with 5-ALA (10-5000 ώg ml−1) was determined via fluorescence analysis. HNE1 cells were irradiated at 4 h after incubation with 5-ALA (10-200 ώg ml−1) by diode laser (λ = 630 nm) at various energy levels (1-50 J cm−2). The survival rates at 6, 12, 24 and 48 h after PDT were determined by MTT assay. Mechanisms of PDT-induced cell death were investigated via Annexin-V/propidium iodide staining and DNA electrophoresis. After incubation with 5-ALA, a time- and dose-dependent increase of cellular PPIX-fluorescence was recorded up to a threshold concentration of 1000 ώg ml−1 5-ALA, above which a decline of fluorescence intensities occurred. Similar values of PPIX-fluorescence were found at 100-1000 ώg ml−1 of 5-ALA. Unlike sole incubation with 5-ALA or sole laser irradiation, the combination of both factors lead to a significant, concentration-, energy- and time-dependent increase of cell death (p < 0.01). At 100 ώg ml−1 ALA and 10 J cm−2 laser irradiation, cellular survival was <5% after 48 h. More than 80% of induced cell deaths thereby occurred via apoptosis within the first 12 h following irradiation; necrosis was accountable for less than 20%. High level induction of apoptosis by 5-ALA-PDT was confirmed by DNA electrophoresis. Our investigations show promising results of 5-ALA based PDT of nasopharyngeal carcinoma in vitro and set the basis for future studies in tumor models or humans, respectively.
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References
A. L. McDermott, S. N. Dutt and J. C., Watkinson, The aetiology of nasopharyngeal carcinoma Clin. Otolaryngol., 2000 26, 82–92.
Karzinome des oberen Aerodigestivtrakts in Kurzgefaßte interdisziplinäre Leitlinien, Association of the Scientific Medical Societies in Germany (AWMF), 2000, p. 69 ff.
Q. Peng, K. Berg, J. Moan, M. Kongshaug and J. M. Nesland, 5-aminolevulinic acid-based photodynamic therapy: principles and experimental research Photochem. Photobiol., 1997 65, 235–251.
A. Hajri, S. Coffy, F. Vallat, S. Evrard, J. Marescaux and M., Aprahamian, Human pancreatic carcinoma cells are sensitive to photodynamic therapy in vitro and in vivo Br. J. Surg., 1999 86, 899–906.
S. P. Zhao, Z. D. Tao, J. Y. Xiao, Z. W. Liu, Q. S. Zeng, Y. H. Yang and Y. Y., Peng, Photoradiation therapy of animal tumors and nasopharyngeal carcinoma Ann. Otol., Rhinol. Laryngol., 1990 99, 454–460.
J. P. Lai, Z. D. Tao, J. Y. Xiao, S. P. Zhao and Y. Q., Tian, Effect of photodynamic therapy on several selected values in the patients with nasopharyngeal carcinoma Ann. Otol., Rhinol. Laryngol., 1997 106, 680–682.
T. J. Dougherty, D. J. Gomer, B. W. Henderson, G. Jori, D. Kessel, M. Korbelik, J. Moan and Q., Peng, Photodynamic therapy J. Natl. Cancer Inst., 1998 90, 889–905.
K. Rick, R. Sroka, H. Stepp, M. Kriegmair, R. M. Huber, K. Jacob and R., Baumgartner, Pharmacokinetics of 5-Aminolevulinic Acid-Induced Protoporphyrin IX in Skin and Blood J. Photochem. Photobiol. B: Biol., 1997 40, 313–319.
J. P. Lai, J. Y. Xiao, S. P. Zhao, Z. D. Tao, Y. Q. Tian YQ, Effect of Nd:YAG laser vaporization in combination with photodynamic therapy on the serum SIL-2R and IL-2 levels and NK activity of the patients with nasopharyngeal carcinoma Chin. J. Otorhinolaryngol., 1997 3, 147–149.
T. J. Dougherty, M. T. Cooper and T. S., Mang, Cutaneous phototoxic occurrences in patients receiving Photofrin Lasers Surg. Med., 1990 10, 485–488.
J. C. Kennedy, R. H. Pottier and D. C., Pross, Medical applications of selective tissue photosensitization induced by exogenous 5-aminolevulinic acid Photochem. Photobiol., 1991 53 supp 100S.
A. Leunig, C. S. Betz, M. Mehlmann, H. Stepp, S. Arbogast, G. Grevers and R., Baumgartner, Detection of squamous cell carcinoma of the oral cavity by imaging 5-aminolevulinic acid-induced protoporphyrin IX fluorescence Laryngoscope, 2000 110, 78–83.
M. Mehlmann, C. S. Betz, H. Stepp, S. Arbogast, R. Baumgartner, G. Grevers and A., Leunig, Fluorescence staining of laryngeal neoplasms after topical application of 5-aminolevulinic acid: preliminary results Lasers Surg. Med., 1999 25, 414–420.
J. P. Lai, C. L. Wang, F. Q. Tang, D. Yang, X. W. Wang, X. P. Xu, J. Y. Xiao, S. P. Zhao and Y. Q., Tian, Apoptosis of mouse HNE1 nasopharyngeal carcinoma cells induced by photodynamic therapy with 630 nm semiconductor laser Int. J. Mod. Cancer Ther., 2000 3, 55–58.
J. P. Lai, H. C. Zhu, Z. D. Tao, J. Y. Xiao, S. P. Zhao and Y. Q., Tian, Quantitative evaluation of photodynamic effect of three photosensitizers on five human nasopharyngeal cancer cell lines Chin. J. Laser. Med. Surg., 1994 3, 100–103.
A. Knappe, W. Beyer, R. Riesenberg, P. Schneede, R. Sroka, E. Unsold and G., Valet, Computer-controlled laser irradiation unit for studies of light-induced processes in cell culture Biomed. Tech., 1995 40, 272–275.
R. Riesenberg, C. Fuchs and M., Kriegmair, Photodynamic effects of 5-aminolevulinic acid-induced porphyrin on human bladder carcinoma cells in vitro Eur. J. Cancer, 1996 32, 328–334.
J. A. Hanpton and S. H., Selman, Mechanism of cell killing in photodynamic therapy using a novel in vivo drug / in vitro light culture system Photochem. Photobiol., 1992 56, 235–243.
M. W. R. Reed, T. Wieman, D. A. Schuschke, M. T. Teng and F. N., Miller, A comparison of the effects of photodynamic therapy on normal and tumor blood vessels in the rat microcirculation Radiat. Res., 1989 119, 542–552.
B. W. Henderson and T. J., Dougherty, How does photodynamic therapy work? Photochem. Photobiol., 1992 55, 145–157.
D. Saparovic, K. J. Mann and N. L., Oleinick, Ceramide generation in response to photodynamic treatment of L5178Y mouse lymphoma cells Cancer Res., 1997 57, 1717–1721.
C. Zhou, S. Chi, J. S. Deng, J. L. Liang, G. Jori and C., Milanesi, Apoptosis of mouse MS-2 fibrosarcoma cells induced by photodynamic therapy with Zn-phthalocyanine Photochem. Photobiol. B: Biol., 1996 33, 219–223.
C. M. Whitacre, D. K. Feyes, T. Satoh, J. Grossmann, J. W. Mulvihill, H. Mukhtar and N. L., Oleinick, Photodynamic therapy with the phthalocyanine photosensitizer Pc 4 of SW 480 human colon cancer xenografts in athymic mice Clin. Cancer Res., 2000 6, 2021–2027.
J. Lai, Z. Tao, J. Xiao, Y. Yan, X. Wang, C. Wang, S. Zhao and Y., Tian, Effect of photodynamic therapy (PDT) on the expression of pro-apoptotic protein Bak in nasopharyngeal carcinoma (NPC) Lasers Surg. Med., 2001 29, 27–32.
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Betz, C.S., Lai, JP., Xiang, W. et al. In vitro photodynamic therapy of nasopharyngeal carcinoma using 5-aminolevulinic acid. Photochem Photobiol Sci 1, 315–319 (2002). https://doi.org/10.1039/b109817a
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DOI: https://doi.org/10.1039/b109817a