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Proceedings Paper

Photosensitization of hematoporphyrin monomethyl ether enhance cellular concentrations of AS-ODNs targeting Bcr-abl gene in K562 cells and efficacy of AS-ODNs killing K562 cells
Author(s): Chuan Shan Xu; Lin Zhang; Le Hua Yu; Zhi Gang Wang; Qing Yang; Xia Bo Zeng
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Paper Abstract

This study was to investigate the effect of photosensitization of Hematoporphyrin monomethyl ether (HMME) on the intracellular uptake of antisense oligonucleotides (AS-ODNs) and cytotoxicity of AS-ODNs targeting bcr-abl gene in K562 cells. The cells were randomized into the experimental group and the controls. The cells in the experimental group were treated by photosensitization of HMMIE with AS-ODNs. The cells in the controls were treated by photosensitization of HMMIE, AS-ODNs alone, HMME treatment alone, laser radiation alone or sham radiation, respectively. Light source was from laser with red light (650 nm) delivered at a total dose of 9 J cm-2. The intracellular uptake of AS-ODNs was measured with flow cytometry and fluorescence microscope, and the proliferation of K562 cells was investigated by colony formation and cell cycle distribution was analyzed by flow cytometry and apoptosis was measured with terminal deoxyuridine nicked-labeling (TUNEL) assay. The results showed that the cells treated by photosenstization have higher fluorescence intensity compared with the cells in the controls. At 24 h after photosensitization with AS-ODNs, a 31% increase in the proportion of cells in the GO-Gi phase relative to sham irradiation was observed and Gi arrest occurred concurrently with a reduction in the percentage of S-phase cells and the rate of apoptosis in K562 cells significantly increased up to 8.60 0.04%. At 14th day, treatment of photosensitization with AS-ODNs resulted in a significant decrease in colony formation in K562 cells. Our data demonstrate that photosensitization of HMTMIEcould enhance intracellular concentrations of AS-ODNs in K562 cells and increase the efficacy of AS-ODNs killing cells. Combination of photosensitization of HMME with AS-ODNs may be of value for more effective management of cancer.

Paper Details

Date Published: 27 October 2006
PDF: 5 pages
Proc. SPIE 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine, 60473M (27 October 2006); doi: 10.1117/12.710943
Show Author Affiliations
Chuan Shan Xu, Chongqing Univ. of Medical Sciences (China)
Southwest Hospital, Third Military Medical Univ. (China)
Lin Zhang, Xinquao Hospital, Third Military Medical Univ. (China)
Le Hua Yu, Chongqing Univ. of Medical Sciences (China)
Zhi Gang Wang, Chongqing Univ. of Medical Sciences (China)
Qing Yang, Southwest Hospital, Third Military Medical Univ. (China)
Xia Bo Zeng, Chongqing Univ. of Medical Sciences (China)


Published in SPIE Proceedings Vol. 6047:
Fourth International Conference on Photonics and Imaging in Biology and Medicine
Kexin Xu; Qingming Luo; Da Xing; Alexander V. Priezzhev; Valery V. Tuchin, Editor(s)

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