Apoptosis-Related Gene Transcription in Human A549 Lung Cancer Cells via A3 Adenosine Receptor

Cellular Physiology and Biochemistry

关键词: A3 adenosine receptor;    A549 lung cancer cell;    Apoptosis;    Transcription;    Bcl-2 family;   

DOI  :  10.1159/000312589

学科分类：分子生物学，细胞生物学和基因

来源: S Karger AG

【 摘 要 】

Background/Aims Extracellular adenosine induces apoptosis in a variety of cancer cells via diverse signaling pathways. The present study investigated the mechanism underlying adenosine-induced apoptosis in A549 human lung cancer cells. Methods MTT assay, TUNEL staining, flow cytometry using propidium iodide and annexin V-FITC, real-time RTPCR, Western blotting, monitoring of mitochondrial membrane potentials, and assay of caspase-3, -8, and -9 activities were carried out in A549 cells, and the siRNA to silence the A3 adenosine receptortargeted gene was constructed. Results Extracellular adenosine induces A549 cell apoptosis in a concentration (0.01-10 mM)-dependent manner, and the effect was inhibited by the A3 adenosine receptor inhibitor MRS1191 or knocking-down A3 adenosine receptor. Like adenosine, the A3 adenosine receptor agonist 2-Cl-IB-MECA also induced A549 cell apoptosis. Adenosine increased expression of mRNAs for Puma, Bax, and Bad, disrupted mitochondrial membrane potentials, and activated caspase-3 and -9 in A549 cells, and those adenosine effects were also suppressed by knocking-down A3 adenosine receptor. Conclusion Adenosine induces A549 cell apoptosis by upregulating expression of Bax, Bad, and Puma, to disrupt mitochondrial membrane potentials and to activate caspase-9 followed by the effector caspase-3, via A3 adenosine receptor.

【 授权许可】

CC BY-NC-ND