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Synthesized Pheophorbide a‐mediated photodynamic therapy induced apoptosis and autophagy in human oral squamous carcinoma cells

Identifieur interne : 002380 ( Istex/Corpus ); précédent : 002379; suivant : 002381

Synthesized Pheophorbide a‐mediated photodynamic therapy induced apoptosis and autophagy in human oral squamous carcinoma cells

Auteurs : Mee Young Ahn ; Hyo-Eun Yoon ; Seong-Min Kwon ; Jun Lee ; Seung-Ki Min ; Yong-Chul Kim ; Sang-Gun Ahn ; Jung-Hoon Yoon

Source :

RBID : ISTEX:297AFD5ED2803EC0AAF5A9BC760DB8D5516396A6

English descriptors

Abstract

Background:  Pheophorbide a (Pa) is a chlorine‐based photosensitizer derived from an ethnopharmacological herb, and our group recently synthesized Pa by the removal of a magnesium ion and a phytyl group from chlorophyll‐a. In this study, the effect of photodynamic therapy (PDT) with synthesized Pa was examined in a human oral squamous cell carcinoma (OSCC) cells. Methods:  Cells were treated with PDT with Pa, and reactive oxygen species (ROS) and mitochondrial membrane potential [ΔΨ (m)] were examined. Apoptosis was measured using annexin V staining and immunoblot. Autophagy was characterized by the increase in LC3B‐II and the formation of autophagosome and acidic vesicular organelles (AVOs). Results:  Pa‐PDT inhibited the proliferation of OSCC cells in a dose‐dependent manner. Pa‐PDT increased the number of apoptotic cells by inactivating ERK pathway. Pa‐PDT also induced autophagy in OSCC cells evidenced by the increased levels of LC3 type II expression and the accumulation of AVOs. The inhibition of autophagy enhanced Pa‐PDT‐mediated cytotoxicity through an increase in necrosis. Conclusions:  These results suggest that synthesized Pa‐PDT exerts anti‐tumor effects by inducing apoptosis and autophagy and provide novel evidence that Pa‐PDT induces autophagy, and autophagy inhibition enhances Pa‐PDT‐mediated necrosis in OSCC cells.

Url:
DOI: 10.1111/j.1600-0714.2012.01187.x

Links to Exploration step

ISTEX:297AFD5ED2803EC0AAF5A9BC760DB8D5516396A6

Le document en format XML

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<div type="abstract" xml:lang="en">Background:  Pheophorbide a (Pa) is a chlorine‐based photosensitizer derived from an ethnopharmacological herb, and our group recently synthesized Pa by the removal of a magnesium ion and a phytyl group from chlorophyll‐a. In this study, the effect of photodynamic therapy (PDT) with synthesized Pa was examined in a human oral squamous cell carcinoma (OSCC) cells. Methods:  Cells were treated with PDT with Pa, and reactive oxygen species (ROS) and mitochondrial membrane potential [ΔΨ (m)] were examined. Apoptosis was measured using annexin V staining and immunoblot. Autophagy was characterized by the increase in LC3B‐II and the formation of autophagosome and acidic vesicular organelles (AVOs). Results:  Pa‐PDT inhibited the proliferation of OSCC cells in a dose‐dependent manner. Pa‐PDT increased the number of apoptotic cells by inactivating ERK pathway. Pa‐PDT also induced autophagy in OSCC cells evidenced by the increased levels of LC3 type II expression and the accumulation of AVOs. The inhibition of autophagy enhanced Pa‐PDT‐mediated cytotoxicity through an increase in necrosis. Conclusions:  These results suggest that synthesized Pa‐PDT exerts anti‐tumor effects by inducing apoptosis and autophagy and provide novel evidence that Pa‐PDT induces autophagy, and autophagy inhibition enhances Pa‐PDT‐mediated necrosis in OSCC cells.</div>
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<hi rend="bold">Background: </hi>
Pheophorbide a (Pa) is a chlorine‐based photosensitizer derived from an ethnopharmacological herb, and our group recently synthesized Pa by the removal of a magnesium ion and a phytyl group from chlorophyll‐a. In this study, the effect of photodynamic therapy (PDT) with synthesized Pa was examined in a human oral squamous cell carcinoma (OSCC) cells.</p>
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Pa‐PDT inhibited the proliferation of OSCC cells in a dose‐dependent manner. Pa‐PDT increased the number of apoptotic cells by inactivating ERK pathway. Pa‐PDT also induced autophagy in OSCC cells evidenced by the increased levels of LC3 type II expression and the accumulation of AVOs. The inhibition of autophagy enhanced Pa‐PDT‐mediated cytotoxicity through an increase in necrosis.</p>
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These results suggest that synthesized Pa‐PDT exerts anti‐tumor effects by inducing apoptosis and autophagy and provide novel evidence that Pa‐PDT induces autophagy, and autophagy inhibition enhances Pa‐PDT‐mediated necrosis in OSCC cells.</p>
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<correspondenceTo>Sang‐Gun Ahn, PhD, Department of Pathology, School of Dentistry, Chosun University 375 Dong‐Gu, Seoseok‐dong, Gwangju, 501‐759 Korea. Tel: +82 62 230 6879, Fax: +82 62 223 3205 and Jung‐Hoon Yoon, DDS, PhD, Department of Oral & Maxillofacial Pathology, College of Dentistry, Daejeon Dental Hospital, Wonkwang University, Daejeon 302‐120, Korea. Tel: +82 42 366 1146, Fax: +82 42 366 1115, E‐mails:
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<b>Background: </b>
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Cells were treated with PDT with Pa, and reactive oxygen species (ROS) and mitochondrial membrane potential [ΔΨ (m)] were examined. Apoptosis was measured using annexin V staining and immunoblot. Autophagy was characterized by the increase in LC3B‐II and the formation of autophagosome and acidic vesicular organelles (AVOs).</p>
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Pa‐PDT inhibited the proliferation of OSCC cells in a dose‐dependent manner. Pa‐PDT increased the number of apoptotic cells by inactivating ERK pathway. Pa‐PDT also induced autophagy in OSCC cells evidenced by the increased levels of LC3 type II expression and the accumulation of AVOs. The inhibition of autophagy enhanced Pa‐PDT‐mediated cytotoxicity through an increase in necrosis.</p>
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<abstract lang="en">Background:  Pheophorbide a (Pa) is a chlorine‐based photosensitizer derived from an ethnopharmacological herb, and our group recently synthesized Pa by the removal of a magnesium ion and a phytyl group from chlorophyll‐a. In this study, the effect of photodynamic therapy (PDT) with synthesized Pa was examined in a human oral squamous cell carcinoma (OSCC) cells. Methods:  Cells were treated with PDT with Pa, and reactive oxygen species (ROS) and mitochondrial membrane potential [ΔΨ (m)] were examined. Apoptosis was measured using annexin V staining and immunoblot. Autophagy was characterized by the increase in LC3B‐II and the formation of autophagosome and acidic vesicular organelles (AVOs). Results:  Pa‐PDT inhibited the proliferation of OSCC cells in a dose‐dependent manner. Pa‐PDT increased the number of apoptotic cells by inactivating ERK pathway. Pa‐PDT also induced autophagy in OSCC cells evidenced by the increased levels of LC3 type II expression and the accumulation of AVOs. The inhibition of autophagy enhanced Pa‐PDT‐mediated cytotoxicity through an increase in necrosis. Conclusions:  These results suggest that synthesized Pa‐PDT exerts anti‐tumor effects by inducing apoptosis and autophagy and provide novel evidence that Pa‐PDT induces autophagy, and autophagy inhibition enhances Pa‐PDT‐mediated necrosis in OSCC cells.</abstract>
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<topic>synthesized Pa‐PDT</topic>
</subject>
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