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Tumor suppressor TSLC1 is implicated in cell proliferation, invasion and apoptosis in laryngeal squamous cell carcinoma by regulating Akt signaling pathway

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Tumor Biology

Abstract

Overwhelming evidence has demonstrated that TSLC1 (tumor suppressor in lung cancer 1), a novel tumor suppressor, is crucially implicated in various biological processes including progression, proliferation and apoptosis during tumorigenesis. However, the exact functions and molecular details of TSLC1 in laryngeal cancer remain ill-defined. Here, the expression of TSLC1 in laryngeal squamous cell carcinoma (LSCC) tissues and cells was detected, and the biological roles of TSLC1 in LSCC cells were investigated. The results showed that expressions of TSLC1 mRNA and protein were significantly reduced in LSCC tissues with low expression in 18 of 85 (21.18 %) and 16 of 85 (18.82 %), respectively. Additionally, statistical analysis revealed a significant correlation of TSLC1 expression with TNM staging and lymph node metastases (P < 0.05), but not related to age, gender and tumor differentiation (P > 0.05). Elevation of TSLC1 level inhibited cell proliferation, reduced cell invasion in vitro and induced cell apoptosis in Hep-2 cells, most importantly, TSLC1 upregulation decreased the level of pAkt, but not changed the level of total Akt in Hep-2 cells. Stepwise investigations demonstrated that overexpression of TSLC1 in Hep-2 cells increased caspase-3 activity and expressions of bax and p21 proteins but decreased the levels of bcl-2, MMP-2 and MMP-9 proteins. These data suggest that TSLC1 may exert essential roles in the progression and development of LSCC, and thus TSLC1 may be a potential molecular target for LSCC treatment.

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Authors and Affiliations

  1. Department of Otorhinolaryngology, First Affiliated Hospital of Xinxiang Medical College, No. 88 JianKang Road, Weihui, Henan, 453100, China

    Baocai Lu, Huimin Wang, Huimin Ma & Jinsong Li

  2. Department of Pathology, First Affiliated Hospital of Xinxiang Medical College, Weihui, Henan, 453100, China

    Wenyu Di

  3. Department of Blood Transfusion, First Affiliated Hospital of Xinxiang Medical College, Weihui, Henan, 453100, China

    Qunmei Zhang

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  1. Baocai Lu
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  2. Wenyu Di
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Correspondence to Baocai Lu.

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Lu, B., Di, W., Wang, H. et al. Tumor suppressor TSLC1 is implicated in cell proliferation, invasion and apoptosis in laryngeal squamous cell carcinoma by regulating Akt signaling pathway. Tumor Biol. 33, 2007–2017 (2012). https://doi.org/10.1007/s13277-012-0460-x

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  • DOI: https://doi.org/10.1007/s13277-012-0460-x

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