J Cancer 2017; 8(3):497-506. doi:10.7150/jca.17444

Research Paper

Identification and characterization of CD133+CD44+ cancer stem cells from human laryngeal squamous cell carcinoma cell lines

Jue Wang1,2*, Yongyan Wu1,2*, Wei Gao1,2*, Fei Li1,2, Yunfeng Bo3, Meixia Zhu1,2, Rong Fu1,2, Qingqing Liu1,2, Shuxin Wen1,2✉, Binquan Wang1,2✉

1. Department of Otolaryngology, Head & Neck Surgery, The First Hospital Affiliated with Shanxi Medical University, Taiyuan, Shanxi, China;
2. Shanxi Key Laboratory of Otolaryngology Head & Neck Cancer, Taiyuan, Shanxi, China;
3. Department of Pathology, Shanxi Cancer Hospital, Taiyuan, Shanxi, China.
*Equal contribution.

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Wang J, Wu Y, Gao W, Li F, Bo Y, Zhu M, Fu R, Liu Q, Wen S, Wang B. Identification and characterization of CD133+CD44+ cancer stem cells from human laryngeal squamous cell carcinoma cell lines. J Cancer 2017; 8(3):497-506. doi:10.7150/jca.17444. Available from http://www.jcancer.org/v08p0497.htm

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Background: Laryngeal squamous cell carcinoma ranks second among head and neck squamous-cell carcinomas. Cancer stem cells can support cancer growth and malignant behavior. Therefore, cancer stem cells isolated from laryngeal squamous cell carcinoma tissue could be used to investigate the initiation, progression, and treatment strategies of this cancer. Methods: We isolated CD133-CD44-, CD133-CD44+, CD133+CD44- and CD133+CD44+ cell populations from laryngeal squamous-cell carcinoma cell lines Hep2 and TU-177 by magnetic-activated cell sorting. Sphere formation, cell proliferation, migration, invasion, colony formation, resistance to radio- and chemotherapy, and in vivo tumorigenicity of these populations were evaluated. Moreover, we investigated the expression of the stem-cell markers (sex determining region Y)-box 2 (SOX2) and octamer-binding transcription factor 4 (OCT4) in CD133-CD44-, CD133-CD44+, CD133+CD44-, CD133+CD44+ cell populations and parental Hep2 and TU-177 cells. Results: As compared with CD133-CD44-, CD133-CD44+, CD133+CD44- populations and parental cells, CD133+CD44+ cells showed higher cell viability, migration and invasive capability and colony formation ability as well as stronger resistance to cisplatin and irradiation. Moreover, levels of SOX2 and OCT4 and tumorigenicity in nude mice were greater in CD133+CD44+ Hep2 and TU-177 cells than other cell populations and parental cells.

Conclusion: The CD133+CD44+ population of laryngeal squamous-cell carcinoma Hep2 and TU-177 cells have stem cell properties and showed more malignant features than CD133+CD44- and CD133-CD44+ cell populations. CD133+CD44+ cancer stem cells may be a promising target for developing anticancer drugs and treatment strategies for laryngeal squamous cell carcinoma.

Keywords: Laryngeal squamous cell carcinoma, Magnetic activated cell sorting, CD133, CD44, cancer stem cell.