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http://dx.doi.org/10.5352/JLS.2018.28.6.718

Toll-like Receptor 4-mediated Apoptotic Cell Death in Primary Isolated Human Cervical Cancers  

Won, Jinyoung (Department of Rehabilitation Science, Graduate School of Inje University)
Hong, Yunkyung (u-Healthcare & Anti-aging Research Center (u-HARC), Inje University)
Park, Sookyoung (u-Healthcare & Anti-aging Research Center (u-HARC), Inje University)
Kim, Joo-Heon (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Hong, Yonggeun (Department of Rehabilitation Science, Graduate School of Inje University)
Publication Information
Journal of Life Science / v.28, no.6, 2018 , pp. 718-725 More about this Journal
Abstract
Toll-like receptor 4 (TLR4) has been implicated in cell proliferation and apoptosis in several types of cancer. In this study, the impact of TLR4 activation on apoptotic cell death in gynecologic cancers induced by lipopolysaccharide (LPS) was investigated. Cervical cancer cell lines were produced from isolated surgical specimens supplied by Paik Hospital. The primary cultures of normal myometrium and gynecologic cancers, including cervical, endometrial, and ovarian cancers, were used to examine the differences in morphological characteristics between normal and cancerous cells. A reverse transcription polymerase chain reaction analysis was used to determine the relative expression levels of TLR4 gene involved in apoptosis-associated signaling in cervical cancer cells. The cancer cell colonies showed a tendency to reach high levels of confluency compared with normal cells. In addition, an enhanced growth rate and loss of contact inhibition were observed in gynecologic cancer cells compared with normal cells (doubling times of 16.6 hr vs. 26 hr, respectively). The expression level of ITGA5, an alpha-5 integrin marker, was upregulated in normal myometrial cells, but this tendency was not exhibited in cervical cancer cells. Furthermore, p53 tumor suppressor gene expression was upregulated, whereas TLR4 and caspase-3 gene expressions were downregulated in cervical cancer cells. Notably, the expression levels of TLR4 and caspase-3 were increased significantly in LPS-treated cancer cells compared with those in non-LPS-treated cells. These results suggest that the TLR4-mediated caspase-dependent apoptotic signaling pathway could be suggested as a therapeutic target for the treatment of gynecologic cancers, including cervical cancers.
Keywords
Apoptosis; gynecologic cancer; lipopolysaccharide; proliferation; Toll-like receptor;
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