Caijin Jin1, Tao Lin2, Liqun Shan3. 1. 1 Department of Thoracic Surgery, Sanmen Chinese Medicine Hospital, Taizhou City, Zhejiang Province, China. 2. 2 Department of Cardio-Thoracic Surgery, Sanmen People's Hospital, Taizhou City, Zhejiang Province, China. 3. 3 Department of Thoracic Surgery, The First People's Hospital of Wenling, Wenling City, Zhejiang Province, China.
Abstract
BACKGROUND: Calbindin 1 (CALB1), a constituent Ca2+-binding protein, has been reported to prevent apoptotic death in tumor cells. However, the microRNA-mediated regulatory mechanism of CALB1 expression in nonsmall cell lung cancer (NSCLC) has not been reported so far. METHODS AND RESULTS: In this study, CALB1 was found to be overexpressed in NSCLC tissues through the immunohistochemistry assay. Higher CALB1 expression levels were significantly associated with the tumor-node-metastasis (TNM) stage. Moreover, higher expression of CALB1 predicts poor survival in NSCLC patients using the Kaplan-Meier plotter online analysis. In addition, miR-454-3p was predicted to target CALB1 using a software algorithm, validated by the luciferase assay, and analyzed by quantitative polymerase chain reaction and Western blot. The authors further found that miR-454-3p was downregulated in NSCLC tissues and cell lines. Downregulation of CALB1 or upregulation of miR-454-3p significantly suppressed NSCLC cell proliferation and induced cell apoptosis as shown by CCK-8 and flow cytometry analysis, respectively. CONCLUSIONS: Our results suggest that CALB1 is a direct target of miR-454-3p and downregulation of CALB1 by miR-454-3p suppressed NSCLC cell functions, which may shed light on its potential application in NSCLC therapy.
BACKGROUND:Calbindin 1 (CALB1), a constituent Ca2+-binding protein, has been reported to prevent apoptotic death in tumor cells. However, the microRNA-mediated regulatory mechanism of CALB1 expression in nonsmall cell lung cancer (NSCLC) has not been reported so far. METHODS AND RESULTS: In this study, CALB1 was found to be overexpressed in NSCLC tissues through the immunohistochemistry assay. Higher CALB1 expression levels were significantly associated with the tumor-node-metastasis (TNM) stage. Moreover, higher expression of CALB1 predicts poor survival in NSCLCpatients using the Kaplan-Meier plotter online analysis. In addition, miR-454-3p was predicted to target CALB1 using a software algorithm, validated by the luciferase assay, and analyzed by quantitative polymerase chain reaction and Western blot. The authors further found that miR-454-3p was downregulated in NSCLC tissues and cell lines. Downregulation of CALB1 or upregulation of miR-454-3p significantly suppressed NSCLC cell proliferation and induced cell apoptosis as shown by CCK-8 and flow cytometry analysis, respectively. CONCLUSIONS: Our results suggest that CALB1 is a direct target of miR-454-3p and downregulation of CALB1 by miR-454-3p suppressed NSCLC cell functions, which may shed light on its potential application in NSCLC therapy.