[Effects of differentially expressed proteins in hepatocellular carcinoma cell treated by different telomerase...

Area of Science:

• Proteomics
• Cancer Biology
• Molecular Medicine

Context:

• Hepatocellular carcinoma (HCC) is a significant global health concern.
• Telomerase plays a critical role in cancer cell proliferation and immortality.
• Targeting telomerase is a promising strategy for HCC treatment.

Purpose:

• To identify differentially expressed proteins in the SMMC-7721 HCC cell line upon treatment with eight distinct telomerase inhibitors.
• To analyze common protein expression changes across various telomerase inhibition strategies.
• To investigate the association between protein expression alterations and telomerase activity.

Summary:

• Surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF-MS) with a weak cation exchanger (WCX-2) protein chip was employed to analyze protein expression in SMMC-7721 cells.
• Cells were treated with eight telomerase inhibitors: human telomerase RNA (hTR) antisense oligodeoxynucleotide (ASODN), hTR sense oligodeoxynucleotide (SODN), human telomerase reverse transcriptase (hTERT) ASODN, hTERT SODN, epigallocatechin gallate (EGCG), 3'-azido-3'-deoxythymidine (AZT), all-trans-retinoic acid (ATRA), and adriamycin (ADM).
• Differential expression of secretory and cytoplasmic proteins was observed, with many having a molecular weight under 10,000 Da. Some proteins exhibited coordinated down-regulation or up-regulation across all treatment groups.

Impact:

• This study reveals specific protein expression profiles associated with telomerase inhibition in HCC cells.
• The findings contribute to understanding the molecular mechanisms underlying telomerase-targeted therapies for hepatocellular carcinoma.
• Identified protein changes may serve as potential biomarkers for treatment response or novel therapeutic targets.