Dataset Information

Identification of MAX signature on MAX deficient SCLC cell lines

ABSTRACT: To development our gene expression approach, we have employed whole genome microarray expression profiling as a discovery platform to identify genes potentialy regulated by the transcription factor MAX.Human SCLC cell lines waere analyzed for mutations at the MAX locus. Those cell lines that were found mutated in MAX and showed no MAX protein expression were used as a models to restore the expression of MAX transcription factor, and Identify MAX signature on Human SCLC. Human SCLC cell lines were hybridyzed in the following manner according for different conditions (Mock -Ø, MAX, shBRG1, MAX-shBRG1): 3 different biological samples for Mock, 3 different biological samples for MAX, 3 different samples for shBRG1 and 3 replicates of the same sample for MAX-shBRG1.

ORGANISM(S): Homo sapiens

SUBMITTER: Romero OA

PROVIDER: S-ECPF-GEOD-48559 | biostudies-other | 2014 Mar

REPOSITORIES: biostudies-other

ACCESS DATA

Similar Datasets

Project description:Radiotherapy has a critical role in the treatment of small cell lung cancer (SCLC). Effectiveness of radiation in SCLC remains limited as resistance results from defects in apoptosis. In the current study, we investigated whether using a Bcl-2/Bcl-XL inhibitor S44563 can enhance radiosensitivity of SCLC cells in vitro and in vivo. In vitro studies confirmed that S44563 induce apoptosis in SCLC cells by inducing hallmarks of apoptosis (cleaved caspase-3, sub-G1 fraction induction and induction of the mitochondrial caspase activation pathway). S44563 markedly enhanced sensitivity of H146 cells and H69 cells to radiation in clonogenic assay. In addition, the combination S44563 and cisplatin-based chemo-radiation showed a dramatic tumor growth delay and increased overall survival in mouse xenograft models. In vitro experiments demonstrated a greater induction of apoptosis (sub-G1 fraction and cleaved caspase-3) with the combination as well as in vivo caspase-3 immunostaining. This positive interaction between S44563 and radiation was greater when S44563 was given after the completion of the radiation, which may be explained by the radiation-induced over expression of anti-apoptotic proteins (Bcl-2 and Bcl-XL) through the NF-?B pathway activation. Taken together, these data underline the critical role of sequence administration of targeted therapies with conventional therapies. SCLC cells which survive to IR highly rely on the induction of anti apoptotic proteins in part through NF- ?B activation for their survival yielding to the concept of 'contextual oncogene addiction' to the Bcl-2/Bcl-XL pathway providing rational for targeting survival pathways to potentiate IR. For transcriptome analysis, 106 cells were seeded in T25 flasks, allowed to growth for 24 h, and then left untreated or treated with 2 Gy radiation. After 24 hours, cells were harvested, lysed for the extraction of RNA, and processed to analyze gene expression.The design of this study consists to 6 hybridizations in dual color with Agilent Human Genome 4x44K (design 014850). The reference is always the untreated condition.

Dataset Information

Identification of MAX signature on MAX deficient SCLC cell lines

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets