Inhibition of tumor cell growth by adenine is mediated by apoptosis induction and cell cycle S phase arrest
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Ming Han1, Xin Cheng2, Zhiqin Gao3, Rongrong Zhao4 and Shizhuang Zhang4
1School of Clinical Medicine, Weifang Medical University, Weifang 261053, China
2Department of Medical Imaging, Weifang Medical University, Weifang 261053, China
3School of Bioscience and Technology, Weifang Medical University, Weifang 261053, China
4Medical Imaging Center, Affiliated Hospital of Weifang Medical University, Weifang 261031, China
Shizhuang Zhang, email: firstname.lastname@example.org
Keywords: adenine, adenosine, cell cycle, apoptosis
Received: June 22, 2017 Accepted: September 21, 2017 Published: October 09, 2017
Gekko swinhonis has a long standing history in Chinese traditional medicine recognized for its application in treating patients with terminal cancer.In order to discover novel anticancer drugs with high anti-tumor efficacy and low toxicity to normal cells, we aim to investigate the anti-tumor components from Gekko swinhonis.Four nucleosides from the extracted samples were enriched, namely adenosine, guanosine, thymidine and inosine. We evaluated the antitumor effect of the four nucleosides and found that adenosine possessed the strongest anti-tumor effect. Besides, adenine could inhibit the growth of Bel-7402 and Hela cells in a dose and time dependent manner, but not normal human cervical keratinocytes. Bel-7402 and Hela cells had undergone apoptosis 48 hours after treatment as evidenced by morphologic changes under TEM, while adenine blocked cell cycle of tumor cells at S phase and subsequently causing cell cycle exit and promoting apoptosis. Moreover, the pharmacokinetics of adenine was stable in cell culture medium for up to 72 hours. Combining its potency with stability, we conclude adenine makes a promising candidate for an anti-tumor drug.
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