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Updated: Aug 16, 2026
Heterogeneity Mapping of Protein Expression in Tumors using Quantitative Immunofluorescence
Published on: October 25, 2011
Two-dimensional gel analysis of protein expression profile in squamous cervical cancer patients
Su Mi Bae1, Chang-Hun Lee, Young Lae Cho
1Cancer Research Center, Catholic Research Institutes of Medical Science, The Catholic University of Korea, Seoul 137-040, South Korea.
Objectives:
Screening in cervical cancer is progressing to find out candidate genes and proteins, which may work as biological markers and play a role in tumor progression. We examined the protein expression patterns of squamous cell carcinoma (SCC) tissues from Korean women using two-dimensional polyacrylamide gel electrophoresis (2-DE) and matrix-assisted laser desorption/ionization-time of fight (MALDI-TOF) mass spectrometer.
Methods:
Normal cervix and SCC tissues were solubilized and 2-DE was performed using the pH 3-10 linear IPG strips of 17 cm length and silver stained. Protein expression was evaluated using PDQuest 2-D software. The differentially expressed protein spots were identified with MALDI-TOF mass spectrometer and the peptide mass spectra identification was performed using Mascot program searching the Swiss-prot or NCBInr databases.
Results:
A total of 35 proteins were detected in SCC. 17 proteins were up-regulated and 18 proteins were down-regulated. Among the proteins identified, 12 proteins (pigment epithelium derived factor, annexin A2 and A5, keratin 19 and 20, heat shock protein 27, smooth muscle protein 22 alpha, alpha-enolase, squamous cell carcinoma antigen 1 and 2, glutathione S-transferase, apolipoprotein a1) were previously known proteins involved in tumor and 21 proteins were newly identified in this study.
Conclusions:
2-DE offers total protein expression profiles of SCC tissues and further characterization of proteins that are differentially expressed will give a chance to identify tumor-specific diagnostic markers for SCC.
