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Conference Paper: Modulation of COX2 and hTERT expression by Photodynamic Therapy in human colon cancer cells
Title | Modulation of COX2 and hTERT expression by Photodynamic Therapy in human colon cancer cells |
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Authors | |
Keywords | Photodynamic Therapy Colon cancer Modulation Cancer Flow cytometry |
Issue Date | 2009 |
Publisher | SPIE - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml?WT.svl=mddp2 |
Citation | 12th World Congress of the International Photodynamic Association, Seattle, WA, 11-15 June 2009. In Proceedings of SPIE, 2009, v. 7380, p. article no. 738065 How to Cite? |
Abstract | Photodynamic therapy (PDT) was employed as a cancer therapy with photosensitizer (PS)-loaded cancer cells, eradicated by the reactive oxygen species after light activation. Cyclo-oxygenase 2 (COX2) is an enzyme expressed in 80% of colon adenocarcinoma and is one of the targets for effective cancer treatment. There is also uprising evidence that the human telomerase reverse transcriptase (hTERT), a catalytic component of telomerase, is reported as a promising indicator for monitoring cancer treatment. In this study, NPe6 mediated PDT on COX2 induced apoptosis in HT-29 was investigated. The cell cycle changes was analysed by flow cytometry and the hTERT expression at pre and post PDT was evaluated at transcription level by Taqman real time PCR. NPe6-PDT in HT-29 cells demonstrated anti-proliferating effect in a drug and light dose dependent manner. LD50 was achieved at 16μg/mL and 2J/cm2 at 4 hour-post treatment with a significant down-regulation of COX2 expression at LD30 and LD50 by immunohistochemical staining (IHC) (p<0.05, One-Way ANOVA). Membrane blebbing was detected in over 60% of cells. 35.2% of treated cells arrested in S-phase at LD50 after 24 hours by flow cytometry. A 0.25- and 0.6-fold down-regulation of hTERT mRNA expression was achieved at LD30 and LD50 respectively by TaqMan real-time PCR. To summarize, NPe6 mediated PDT down-regulated COX2 expression and triggered cell apoptosis. The hTERT can serve as an indicative marker for monitoring NPe6-PDT cancer treatment efficacy. |
Persistent Identifier | http://hdl.handle.net/10722/207481 |
ISSN | 2023 SCImago Journal Rankings: 0.152 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Yow, CLMN | - |
dc.contributor.author | Chu, ESM | - |
dc.date.accessioned | 2014-12-29T08:15:51Z | - |
dc.date.available | 2014-12-29T08:15:51Z | - |
dc.date.issued | 2009 | - |
dc.identifier.citation | 12th World Congress of the International Photodynamic Association, Seattle, WA, 11-15 June 2009. In Proceedings of SPIE, 2009, v. 7380, p. article no. 738065 | - |
dc.identifier.issn | 0277-786X | - |
dc.identifier.uri | http://hdl.handle.net/10722/207481 | - |
dc.description.abstract | Photodynamic therapy (PDT) was employed as a cancer therapy with photosensitizer (PS)-loaded cancer cells, eradicated by the reactive oxygen species after light activation. Cyclo-oxygenase 2 (COX2) is an enzyme expressed in 80% of colon adenocarcinoma and is one of the targets for effective cancer treatment. There is also uprising evidence that the human telomerase reverse transcriptase (hTERT), a catalytic component of telomerase, is reported as a promising indicator for monitoring cancer treatment. In this study, NPe6 mediated PDT on COX2 induced apoptosis in HT-29 was investigated. The cell cycle changes was analysed by flow cytometry and the hTERT expression at pre and post PDT was evaluated at transcription level by Taqman real time PCR. NPe6-PDT in HT-29 cells demonstrated anti-proliferating effect in a drug and light dose dependent manner. LD50 was achieved at 16μg/mL and 2J/cm2 at 4 hour-post treatment with a significant down-regulation of COX2 expression at LD30 and LD50 by immunohistochemical staining (IHC) (p<0.05, One-Way ANOVA). Membrane blebbing was detected in over 60% of cells. 35.2% of treated cells arrested in S-phase at LD50 after 24 hours by flow cytometry. A 0.25- and 0.6-fold down-regulation of hTERT mRNA expression was achieved at LD30 and LD50 respectively by TaqMan real-time PCR. To summarize, NPe6 mediated PDT down-regulated COX2 expression and triggered cell apoptosis. The hTERT can serve as an indicative marker for monitoring NPe6-PDT cancer treatment efficacy. | - |
dc.language | eng | - |
dc.publisher | SPIE - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml?WT.svl=mddp2 | - |
dc.relation.ispartof | Proceedings of SPIE | - |
dc.rights | Copyright 2009 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited. This article is available online at https://doi.org/10.1117/12.823084 | - |
dc.subject | Photodynamic Therapy | - |
dc.subject | Colon cancer | - |
dc.subject | Modulation | - |
dc.subject | Cancer | - |
dc.subject | Flow cytometry | - |
dc.title | Modulation of COX2 and hTERT expression by Photodynamic Therapy in human colon cancer cells | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Chu, ESM: elliecsm@hku.hk, htellie@inet.polyu.edu.hk | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1117/12.823084 | - |
dc.identifier.scopus | eid_2-s2.0-79959691207 | - |
dc.identifier.hkuros | 166069 | - |
dc.identifier.volume | 7380 | - |
dc.identifier.spage | article no. 738065 | - |
dc.identifier.epage | article no. 738065 | - |
dc.identifier.isi | WOS:000313709100104 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0277-786X | - |