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BRD4 Regulates Gemcitabine Efficacy by Modulating Autophagy Activity in Osteosarcoma Cells [Cell lines]

GSE255956 Homo sapiens (human) RNA-seq (gene expression) 10 samples Submitted 2025/12/31 Platform GPL21290
At a glance

RNA-seq (gene expression) · human · 10 samples

What it is
RNA-seq (gene expression)Gene activity measured by sequencing. The summary does not mention single-cell work, so this is most likely bulk: one average per sample, the usual starting point for comparing groups.
Organism
Homo sapiens (human)
Topic
OsteosarcomaThis series is part of our curated briefing on it.
Samples
10 samples
Data you can get
A processed table (series matrix) and supplementary files from NCBI; the raw sequencing reads from ENA. Which of these hold counts depends on the study, so check the file list.
Summary (written by the submitters)
Therapeutic options for metastatic or recurrent osteosarcoma are limited. Gemcitabine and 12 docetaxel combination is used as second-line therapy for this disease. Bromodomain-containing 13 protein 4 (BRD4) plays essential roles in regulating autophagy in several human diseases and is 14 overexpressed in osteosarcoma. Thus, in the current study, we investigated whether BRD4 is 15 involved in the modulation of gemcitabine-induced autophagy in osteosarcoma.
Read the full summary ↓
We confirmed 16 that gemcitabine induced autophagic flux in LM7 and CCH-OS-D human osteosarcoma cell lines. 17 Furthermore, we found that gemcitabine induced BRD4 protein and mRNA expression in a time-18 dependent manner in LM7 cells and also in CCH-OS-D cells but only at the mRNA level. Moreover, 19 gemcitabine induced CCAAT/enhancer binding protein beta (C/EBPβ), a transcription factor 20 known to regulate autophagy. We further showed that C/EBPβ induction was mediated by BRD4 21 as inhibition of BRD4 blocked its induction. Furthermore, we demonstrated that gemcitabine-22 induced C/EBPβ bound to BRD4. Because inhibition of BRD4 diminished autophagic flux, we 23 conclude that BRD4 may act as an epigenetic regulator of gemcitabine-induced autophagy in 24 osteosarcoma via C/EBPβ. Additionally, because inhibition of BRD4 in gemcitabine treated 25 osteosarcoma cells led to different outcomes, our data suggests the potential for the BRD4- 26 C/EBPβ interaction to define gemcitabine-induced autophagy outcome in osteosarcoma.
This dataset
Download · which file do I need?

Direct links to NCBI and ENA, no account and no request form. Pick by what you want to do: take the small processed table to look, the supplementary files to re-analyse, or the original raw data to start over.

1 · Just have a look

Processed table

The series matrix: one table of values per sample as the submitters processed it. The smallest download, and it opens in Excel or R. Start here to see what the data look like.

2 · Re-analyse it

Supplementary files

The count tables and other files the authors uploaded. Take only the samples you need, or the whole study as GSE255956_RAW.tar (it can run to tens of gigabytes).

3 · Start from the raw reads

Raw sequencing reads

The original FASTQ files, straight from the sequencer, held at ENA. Large, and you align them yourself, so only choose this if you need to re-process the study from scratch.

What the files usually look like: For RNA-seq the counts are usually a table among the supplementary files (look for 'counts', 'expression', 'FPKM' or 'TPM' in the file name). The series matrix of a sequencing study is sometimes nearly empty.

Also filed as BioProject PRJNA1077299 and SRA study SRP490026. Searching any of these in the dataset finder brings you back here.

Samples in this study

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