Abstract:
:Adenosine, a metabolite of ATP, ubiquitously exists in a wide range of organs and tissues. We previously reported that adenosine was implicated in apoptosis in many cancer cells by extrinsic and/or intrinsic pathways. Here, we found that adenosine suppresses the cell growth by induction of apoptosis of human colonic cancer cells through a novel mechanism. Adenosine suppresses the cell growth of human SW620 and SW480 colon cells in an adenosine transporter and adenosine kinase dependent manner. Moreover, the cell growth suppression is induced by apoptosis through activation of caspase-3 and PARP, and accumulation of ROS in cells. Importantly, we found that adenosine increases the expression of TNFR1 and RIPK1 and the phosphorylation of p38. Knockdown of TNFR1 or RIPK1 impairs the activation of p38, blocks the cleavage of PARP, and provides partially, yet significantly protection from cell death, including reducing the ROS generation in the colon cancer cells. These results indicate that a TNFR1/RIPK1/P38 axis is present in adenosine-induced apoptosis of colonic cancer cells. This axis triggers apoptosis and plays crucial roles in relay of the death signaling. Our study also provides additional experimental evidence for adenosine as a potent therapeutic drug in cancer therapy.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Yu S,Hou D,Chen P,Zhang Q,Lv B,Ma Y,Liu F,Liu H,Song EJ,Yang D,Liu Jdoi
10.1016/j.bbrc.2015.03.103subject
Has Abstractpub_date
2015-05-08 00:00:00pages
759-65issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(15)00559-8journal_volume
460pub_type
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