Article ; Online: Targeting autophagy enhances BO-1051-induced apoptosis in human malignant glioma cells.
Cancer chemotherapy and pharmacology
2012 Volume 69, Issue 3, Page(s) 621–633
Abstract: Purpose: BO-1051 is an N-mustard derivative that is conjugated with DNA-affinic 9-anilinoacridine ... Since BO-1051 was reported to have strong anticancer activity, we investigated the effect and underlying ... mechanism of BO-1051 in human glioma cell lines.: Methods: Human glioma cell lines U251MG and U87MG were ...
Abstract | Purpose: BO-1051 is an N-mustard derivative that is conjugated with DNA-affinic 9-anilinoacridine. Since BO-1051 was reported to have strong anticancer activity, we investigated the effect and underlying mechanism of BO-1051 in human glioma cell lines. Methods: Human glioma cell lines U251MG and U87MG were studied with BO-1051 or the combination of BO-1051 and autophagic inhibitors. Growth inhibition was assessed by MTT assay. Apoptosis was measured by annexin V staining followed by flow cytometry and immunoblotting for apoptosis-related molecules. Induction of autophagy was detected by acridine orange labeling, electron microscopy, LC3 localization and its conversion. Transfection of shRNA was used to determine the involvement of Beclin1 in apoptotic cell death. Results: MTT assay showed that BO-1051 suppressed the viability of four glioma cell lines (U251MG, U87MG, GBM-3 and DBTRG-05MG) in a dose-dependent manner. The IC(50) values of BO-1051 for the glioma cells were significantly lower than the values for primary neurons cultures and normal fibroblast cells. Moreover, BO-1051 not only induced apoptotic cell death, but also enhanced autophagic flux via inhibition of Akt/mTOR and activation of Erk1/2. Importantly, suppression of autophagy by 3-methyladenine or bafilomycin A1 significantly increased BO-1051-induced apoptotic cell death in U251MG and U87MG cells. In addition, the proportion of apoptotic cells after BO-1051 treatment was enhanced by co-treatment with shRNA against Beclin1. Conclusions: BO-1051 induced both apoptosis and autophagy, and inhibition of autophagy significantly augmented the cytotoxic effect of BO-1051. Thus, a combination of BO-1051 and autophagic inhibitors offers a potentially new therapeutic modality for the treatment of malignant glioma. |
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MeSH term(s) | Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Apoptosis/drug effects ; Autophagy/drug effects ; Blotting, Western ; Brain Neoplasms/drug therapy ; Brain Neoplasms/metabolism ; Brain Neoplasms/pathology ; Cell Culture Techniques ; Cell Survival/drug effects ; Dose-Response Relationship, Drug ; Glioma/drug therapy ; Glioma/metabolism ; Glioma/pathology ; Humans ; MAP Kinase Signaling System/drug effects ; Membrane Potential, Mitochondrial/drug effects ; Microscopy, Electron, Transmission ; Microscopy, Fluorescence ; Microscopy, Phase-Contrast ; Molecular Structure ; Nitrogen Mustard Compounds/chemistry ; Nitrogen Mustard Compounds/pharmacology ; Proto-Oncogene Proteins c-akt/antagonists & inhibitors ; TOR Serine-Threonine Kinases/antagonists & inhibitors |
Chemical Substances | Antineoplastic Agents ; BO-1051 ; Nitrogen Mustard Compounds ; MTOR protein, human (EC 2.7.1.1) ; TOR Serine-Threonine Kinases (EC 2.7.1.1) ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1) |
Language | English |
Publishing date | 2012-03 |
Publishing country | Germany |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 6820-2 |
ISSN | 1432-0843 ; 0344-5704 ; 0943-9404 |
ISSN (online) | 1432-0843 |
ISSN | 0344-5704 ; 0943-9404 |
DOI | 10.1007/s00280-011-1747-0 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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