BC3EE2,9B, a synthetic carbazole derivative, upregulates autophagy and synergistically sensitizes human GBM8901 glioblastoma cells to temozolomide

• Published in: International journal of molecular medicine Vol. 36; no. 5; pp. 1244 - 1252
• Main Authors: CHEN, CHIEN-MIN, SYU, JHIH-PU, WAY, TZONG-DER, HUANG, LI-JIAU, KUO, SHENG-CHU, LIN, CHUNG-TIEN, LIN, CHIH-LI
• Format: Journal Article
• Language: English
• Published: Greece D.A. Spandidos 01.11.2015; Spandidos Publications; Spandidos Publications UK Ltd
• Subjects: Akt; Antineoplastic Agents - pharmacology; Apoptosis; Autophagy; Autophagy - drug effects; Autophagy - genetics; Brain cancer; Brain Neoplasms - drug therapy; Brain Neoplasms - genetics; Cancer; Cancer therapies; carbazole; Carbazoles - pharmacology; Care and treatment; Cell adhesion & migration; Cell cycle; Cell Cycle Checkpoints - drug effects; Cell Cycle Checkpoints - genetics; Cell growth; Cell Line, Tumor; Cell Movement - drug effects; Cell Proliferation - drug effects; Cell Proliferation - genetics; Chemotherapy; Cytotoxicity; Dacarbazine - analogs & derivatives; Dacarbazine - pharmacology; Deoxyribonucleic acid; DNA; DNA repair; Dosage and administration; Drug resistance; Drug Resistance, Neoplasm - drug effects; Drug Resistance, Neoplasm - genetics; Drug Synergism; G1 Phase - drug effects; G1 Phase - genetics; glioblastoma; Glioblastoma - drug therapy; Glioblastoma - genetics; Glioblastoma multiforme; Humans; Immunoglobulins; Kinases; Laboratories; Medical prognosis; Mutation; Neoplasm Invasiveness - genetics; Neoplasm Invasiveness - pathology; Proto-Oncogene Proteins c-akt - genetics; Risk factors; Signal Transduction - drug effects; Signal Transduction - genetics; Studies; Temozolomide; Tumors; Up-Regulation - drug effects; Up-Regulation - genetics; Taiwan; United States > US
• ISSN: 1107-3756; 1791-244X
• DOI: 10.3892/ijmm.2015.2332

Glioblastoma multiforme (GBM) is the most fatal form of human brain cancer. Although temozolomide (TMZ), an oral alkylating chemotherapeutic agent, improves the survival rate, the prognosis of patients with GBM remains poor. Naturally occurring carbazole alkaloids isolated from curry leaves (Murraya koenigii Spreng.) have been shown to possess a wide range of anticancer properties. However, the effects of carbazole derivatives on glioblastoma cells remain poorly understood. In the present study, anti-glioblastoma profiles of a series of synthetic carbazole derivatives were evaluated in vitro. The most promising derivative in this series was BC3EE2,9B, which showed significant anti-proliferative effects in GBM8401 and GBM8901 cells. BC3EE2,9B also triggered cell-cycle arrest, most prominently at the G1 stage, and suppressed glioblastoma cell invasion and migration. Furthermore, BC3EE2,9B induced autophagy-mediated cell death and synergistically sensitized GBM cells to TMZ cytotoxicity. The possible mechanism underlying BC3EE2,9B-induced autophagy may involve activation of adenosine monophosphate-activated protein kinase and the attenuation of the Akt and mammalian target of the rapamycin downstream signaling pathway. Taken together, the present results provide molecular evidence for the mode of action governing the ability of BC3EE2,9B to sensitize drug-resistant glioblastoma cells to the chemotherapeutic agent TMZ.