Docosahexaenoic acid-induced apoptosis is mediated by activation of mitogen-activated protein kinases in human cancer cells

被引：44

作者：

Jeong, Soyeon ^{[1
,3
]}

Jing, Kaipeng ^{[1
,3
]}

Kim, Nayeong ^{[1
,3
]}

Shin, Soyeon ^{[1
,3
]}

Kim, Soyeon ^{[1
,3
]}

Song, Kyoung-Sub ^{[1
]}

Heo, Jun-Young ^{[1
]}

Park, Ji-Hoon ^{[1
]}

Seo, Kang-Sik ^{[1
]}

Han, Jeongsu ^{[1
]}

Wu, Tong ^{[4
]}

Kweon, Gi-Ryang ^{[1
]}

Park, Seung-Kiel ^{[1
]}

Park, Jong-Il ^{[1
]}

Lim, Kyu ^{[2
,3
]}

机构：

[1] Chungnam Natl Univ, Sch Med, Dept Biochem, Taejon 301747, South Korea

[2] Chungnam Natl Univ, Sch Med, Canc Res Inst, Taejon 301747, South Korea

[3] Chungnam Natl Univ, Sch Med, Infect Signaling Network Res Ctr, Taejon 301747, South Korea

[4] Tulane Univ, Sch Med, Dept Pathol & Lab Med, New Orleans, LA 70112 USA

来源：

BMC CANCER | 2014年 / 14卷

基金：

新加坡国家研究基金会;

关键词：

Docosahexaenoic acid; Reactive oxygen species; Mitogen-activated protein kinases; Apoptosis; Cancer; POLYUNSATURATED FATTY-ACIDS; SIGNALING PATHWAYS; BETA-CATENIN; DEATH; EXPRESSION; ERK; PHOSPHORYLATION; INHIBITION; MECHANISMS; AUTOPHAGY;

D O I：

10.1186/1471-2407-14-481

中图分类号：

R73 [肿瘤学];

学科分类号：

100214 ;

摘要：

Background: The role of omega-3 polyunsaturated fatty acids (omega 3-PUFAs) in cancer prevention has been demonstrated; however, the exact molecular mechanisms underlying the anticancer activity omega 3-PUFAs are not fully understood. Here, we investigated the relationship between the anticancer action of a specific omega 3-PUFA docosahexaenoic acid (DHA), and the conventional mitogen-activated protein kinases (MAPKs) including extracellular signal-regulated kinase (ERK), c-JUN N-terminal kinase (JNK) and p38 whose dysregulation has been implicated in human cancers. Methods: MTT assays were carried out to determine cell viability of cancer cell lines (PA-1, H1299, D54MG and SiHa) from different origins. Apoptosis was confirmed by TUNEL staining, DNA fragmentation analysis and caspase activity assays. Activities of the conventional MAPKs were monitored by their phosphorylation levels using immunoblotting and immunocytochemistry analysis. Reactive oxygen species (ROS) production was measured by flow cytometry and microscopy using fluorescent probes for general ROS and mitochondrial superoxide. Results: DHA treatment decreased cell viability and induced apoptotic cell death in all four studied cell lines. DHA-induced apoptosis was coupled to the activation of the conventional MAPKs, and knockdown of ERK/JNK/p38 by small interfering RNAs reduced the apoptosis induced by DHA, indicating that the pro-apoptotic effect of DHA is mediated by MAPKs activation. Further study revealed that the DHA-induced MAPKs activation and apoptosis was associated with mitochondrial ROS overproduction and malfunction, and that ROS inhibition remarkably reversed these effects of DHA. Conclusion: Together, these results indicate that DHA-induced MAPKs activation is dependent on its capacity to provoke mitochondrial ROS generation, and accounts for its cytotoxic effect in human cancer cells.

引用

页数：11

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