Downregulation of Calbindin 1 by miR-454-3p Suppresses Cell Proliferation in Nonsmall Cell Lung Cancer In Vitro

Area of Science:

• Molecular oncology
• Cancer biology
• Biochemistry

Background:

• Calbindin 1 (CALB1), a calcium-binding protein, is known to protect tumor cells from apoptosis.
• The regulatory mechanisms of CALB1 expression in nonsmall cell lung cancer (NSCLC), particularly microRNA (miRNA) involvement, remain largely uncharacterized.

Purpose of the Study:

• To investigate the role of CALB1 in NSCLC.
• To elucidate the microRNA-mediated regulation of CALB1 in NSCLC.
• To explore the therapeutic potential of targeting the CALB1-miRNA axis in NSCLC.

Main Methods:

• Immunohistochemistry was used to assess CALB1 expression in NSCLC tissues.
• Bioinformatics algorithms predicted potential miRNA targets for CALB1.
• Luciferase assays, quantitative polymerase chain reaction (qPCR), and Western blot validated the interaction between miR-454-3p and CALB1.
• Cell proliferation was measured using CCK-8 assays, and apoptosis was analyzed by flow cytometry.

Main Results:

• CALB1 was found to be overexpressed in NSCLC tissues and correlated with advanced tumor-node-metastasis (TNM) stage.
• Higher CALB1 expression was associated with poorer survival outcomes in NSCLC patients.
• miR-454-3p was identified as a direct regulator of CALB1 and was found to be downregulated in NSCLC.
• Both CALB1 downregulation and miR-454-3p upregulation significantly inhibited NSCLC cell proliferation and induced apoptosis.

Conclusions:

• CALB1 is a direct target of miR-454-3p in NSCLC.
• The miR-454-3p/CALB1 pathway plays a critical role in regulating NSCLC cell proliferation and apoptosis.
• Targeting the CALB1 pathway offers a potential therapeutic strategy for NSCLC.