白藜芦醇在体外培养及小鼠异种移植模型中抑制人卵巢癌细胞生长:真核延伸因子1A2作为潜在靶点。
Resveratrol suppresses growth of human ovarian cancer cells in culture and in a murine xenograft model: eukaryotic elongation factor 1A2 as a potential target.
作者信息
Lee Mee-Hyun, Choi Bu Young, Kundu Joydeb Kumar, Shin Young Kee, Na Hye-Kyung, Surh Young-Joon
机构信息
Department of Pharmacy, College of Pharmacy, and Cancer Research Institute, Seoul National University, Seoul, South Korea.
出版信息
Cancer Res. 2009 Sep 15;69(18):7449-58. doi: 10.1158/0008-5472.CAN-09-1266. Epub 2009 Sep 8.
The eukaryotic elongation factor 1A2 (eEF1A2) is known to retain oncogenic potential and is recognized as a novel target for cancer prevention and therapy. Resveratrol (trans-3,4',5-trihydroxystilbene), a phytoalexin present in grapes, has been reported to possess chemopreventive and chemotherapeutic activities. In the present study, we examined the growth-inhibitory effects of resveratrol in human ovarian cancer PA-1 cells, considering eEF1A2 as a potential molecular target. Pretreatment with resveratrol attenuated proliferation of serum-starved PA-1 cells stimulated with insulin or serum. Resveratrol also activated caspase-9, -7, and -3 and induced apoptosis in PA-1 cells in the presence of insulin or serum. Insulin or serum stimulation of PA-1 cells resulted in the marked induction of eEF1A2, which was suppressed by pretreatment with resveratrol. Moreover, resveratrol inhibited insulin- or serum-induced soft-agar colony formation in eEF1A2-transfected NIH3T3 cells. An antibody array directed to assess the phosphorylation of protein kinases revealed that treatment with insulin or serum induced the phosphorylation of Akt in PA-1 cells. Pharmacologic inhibition of Akt with LY294002 abrogated insulin- or serum-induced eEF1A2 expression and increased the caspase-3 activity. In another experiment, i.p. administration of resveratrol retarded the growth of PA-1 cell xenograft and the expression of eEF1A2 in athymic nude mice in association with decreased bromodeoxyuridine positivity, reduced expression of proliferating cell nuclear antigen, increased the terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling and caspase-3 staining, and diminished CD31 positivity. Taken together, eEF1A2 may be considered as a potential molecular target for the antiproliferative effects of resveratrol in PA-1 ovarian cancer cells.
真核生物延伸因子1A2(eEF1A2)具有致癌潜能,被视为癌症预防和治疗的新靶点。白藜芦醇(反式-3,4',5-三羟基芪)是葡萄中的一种植保素,据报道具有化学预防和化学治疗活性。在本研究中,我们将eEF1A2视为潜在分子靶点,检测了白藜芦醇对人卵巢癌PA-1细胞的生长抑制作用。白藜芦醇预处理可减弱胰岛素或血清刺激的血清饥饿PA-1细胞的增殖。在存在胰岛素或血清的情况下,白藜芦醇还可激活半胱天冬酶-9、-7和-3,并诱导PA-1细胞凋亡。胰岛素或血清刺激PA-1细胞会导致eEF1A2显著诱导,而白藜芦醇预处理可抑制这种诱导。此外,白藜芦醇可抑制胰岛素或血清诱导的eEF1A2转染的NIH3T3细胞在软琼脂中的集落形成。一种用于评估蛋白激酶磷酸化的抗体阵列显示,胰岛素或血清处理可诱导PA-1细胞中Akt的磷酸化。用LY294002对Akt进行药理抑制可消除胰岛素或血清诱导的eEF1A2表达,并增加半胱天冬酶-3活性。在另一项实验中,腹腔注射白藜芦醇可延缓PA-1细胞异种移植瘤的生长以及无胸腺裸鼠中eEF1A2的表达,同时溴脱氧尿苷阳性率降低、增殖细胞核抗原表达减少、末端脱氧核苷酸转移酶介导的dUTP缺口末端标记和半胱天冬酶-3染色增加,以及CD31阳性率降低。综上所述,eEF1A2可能被视为白藜芦醇对PA-1卵巢癌细胞抗增殖作用的潜在分子靶点。