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Novel cell-surface peptides specific to human oral squamous cell carcinoma using an E. coli peptide display library
Noriko Kawai1, Junichi Asaumi, Jun Murakami
1Department of Oral and Maxillofacial Radiology, Field of Tumor Biology, Okayama University, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8525, Japan.
Abstract:
We attempted to find a specific antigen of oral squamous cell carcinoma (SCC) cells that could be safely applied to gene therapy in the conservative clinical treatment of oral cancer. We performed subtraction using normal human keratinocyte cells, followed by selection using four oral SCC cell lines. We isolated three clones from poorly differentiated SCC cells and four from well-differentiated SCC cells. These seven clones adsorbed to the oral SCC cells at rates 10-100 times those of normal human keratinocyte cells. The three clones from the poorly differentiated SCC cells showed the same peptide sequence (LAPRTHP). Of the four clones from the well-differentiated SCC cells, three showed the same peptide sequence (FGTLPGT) and the fourth showed a different one (VTPNSTP). Each peptide sequence may recognize the material that exists specifically on the oral SCC cell cortex. We can expect applications not only for tumor-targeting treatment using a gene therapy virus vector but also for diagnosis using, as a tumor marker, the peculiar SCC surface material that these peptides recognize.
Insights
Researchers identified novel peptide antigens specific to oral squamous cell carcinoma (SCC) cells. These findings offer potential for targeted gene therapy and diagnostic markers in oral cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Biotechnology
Background:
- Oral squamous cell carcinoma (SCC) is a prevalent cancer requiring innovative treatment strategies.
- Developing targeted therapies for oral cancer necessitates identifying specific tumor antigens.
- Gene therapy offers a promising avenue for conservative clinical treatment of oral cancer.
Purpose of the Study:
- To identify specific antigens on oral squamous cell carcinoma (SCC) cells for potential gene therapy applications.
- To discover novel tumor markers for improved oral cancer diagnosis.
- To isolate and characterize peptide sequences that selectively bind to oral SCC cells.
Main Methods:
- Subtraction hybridization using normal human keratinocyte cells and oral SCC cell lines.
- Selection and isolation of specific antigen clones from poorly and well-differentiated SCC cells.
- Peptide sequencing of isolated clones to identify specific antigen motifs.
Main Results:
- Seven specific clones were isolated, showing 10-100 times higher adsorption to oral SCC cells than normal keratinocytes.
- Three clones from poorly differentiated SCC cells shared the peptide sequence LAPRTHP.
- Four clones from well-differentiated SCC cells yielded peptide sequences FGTLPGT and VTPNSTP.
Conclusions:
- Identified peptide sequences (LAPRTHP, FGTLPGT, VTPNSTP) likely recognize specific materials on the oral SCC cell cortex.
- These peptides hold potential for developing targeted gene therapy vectors for oral cancer.
- The identified peptides may serve as diagnostic tumor markers for oral cancer detection.
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