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Erschienen in: Annals of Surgical Oncology 13/2013

01.12.2013 | Translational Research and Biomarkers

Increased Expression of ABCB6 Enhances Protoporphyrin IX Accumulation and Photodynamic Effect in Human Glioma

verfasst von: Shi-Guang Zhao, MD, PhD, Xiao-Feng Chen, MD, PhD, Li-Gang Wang, MD, PhD, Guang Yang, MD, PhD, Da-Yong Han, MD, Lei Teng, MD PhD, Ming-Chun Yang, MD, PhD, Da-Yong Wang, MD, Chen Shi, BSc, Yao-Hua Liu, MD, PhD, Bing-Jie Zheng, MD, PhD, Chang-Bin Shi, MD, PhD, Xu Gao, MD, PhD, Nikolai G. Rainov, MD, PhD

Erschienen in: Annals of Surgical Oncology | Ausgabe 13/2013

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Abstract

Background

Glioma recurrence usually occurs close to the tumor resection margins as a result of residual infiltrating glioma cells. 5-aminolevulinic acid (ALA) fluorescence-guided resection of gliomas has been demonstrated to enhance discrimination of tumor tissue and to improve survival. ALA-based photodynamic therapy is an effective albeit still experimental adjuvant treatment option for gliomas. However, insufficient protoporphyrin IX (PpIX) accumulation may limit the benefits of fluorescence-guided resection and photodynamic therapy.

Methods

We investigated the expression of the ATP-binding cassette transporter ABCB6, which regulates porphyrin synthesis, in surgical specimens from human gliomas and manipulated ABCB6 in human glioma cell lines.

Results

Our findings demonstrated that expression levels of ABCB6 were greatly elevated in human gliomas compared with normal brain tissues and correlated with World Health Organization histologic grade. A previously undescribed finding was that ABCB6 mRNA expression in solidly fluorescing tumor tissues was higher than that in vaguely fluorescing tumors, suggesting that ABCB6 may be at least in part responsible for PpIX accumulation in glioma cells. Accordingly, ABCB6 overexpression in glioma cell lines caused a marked increase in intracellular levels of PpIX, and was more sensitive to ALA-induced photodynamic therapy—events that could be prevented by silencing ABCB6 via siRNA treatment.

Conclusions

Our findings indicate a crucial role of ABCB6 in ALA metabolism and accumulation of PpIX in glioma. ABCB6 overexpression is a potential approach to enhance accumulation of PpIX for optimizing the subjective discrimination of vague fluorescence and improving the efficacy of ALA-based photodynamic therapy.
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Metadaten
Titel
Increased Expression of ABCB6 Enhances Protoporphyrin IX Accumulation and Photodynamic Effect in Human Glioma
verfasst von
Shi-Guang Zhao, MD, PhD
Xiao-Feng Chen, MD, PhD
Li-Gang Wang, MD, PhD
Guang Yang, MD, PhD
Da-Yong Han, MD
Lei Teng, MD PhD
Ming-Chun Yang, MD, PhD
Da-Yong Wang, MD
Chen Shi, BSc
Yao-Hua Liu, MD, PhD
Bing-Jie Zheng, MD, PhD
Chang-Bin Shi, MD, PhD
Xu Gao, MD, PhD
Nikolai G. Rainov, MD, PhD
Publikationsdatum
01.12.2013
Verlag
Springer US
Erschienen in
Annals of Surgical Oncology / Ausgabe 13/2013
Print ISSN: 1068-9265
Elektronische ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-011-2201-6

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