A possible interplay between HR‐HPV and stemness in tumor development: an in vivo investigation of CD133 as a putative marker of cancer stem cell in HPV18‐infected KB cell line

单元格排序 癌症干细胞 癌症研究 体内 生物 人口 癌症 细胞培养 细胞 干细胞标记物 干细胞 免疫组织化学 病理 分子生物学 免疫学 医学 细胞生物学 遗传学 环境卫生
作者
S. De Maria,Angela Santoro,Maria Pia Fuggetta,Romina Rocchetti,Andrea Cottarelli,Giulia Lanzilli,Paola Stiuso,Giuseppe Angelico,Saveria Spadola,Gian Franco Zannoni,Corrado Rubini,Monica Emanuelli,Maria Carmela Pedicillo,Giuseppe Pannone,Lorenzo Lo Muzio
出处
期刊:Apmis [Wiley]
卷期号:128 (12): 637-646 被引量:7
标识
DOI:10.1111/apm.13078
摘要

High-risk HPVs (HR-HPVs) are DNA viruses considered as primary etiologic factors in malignancies of the low female genital tract. Their presence has also been documented in oropharyngeal and laryngeal cancers. However, HPV infection is considered a necessary but not sufficient cause of tumoral development; meantime, increasing evidences on the tumorigenic role of cancer stem cells (CSCs) have been documented in the literature. CSCs represent a small subpopulation of neoplastic cells with self-renewal potential, capable of maintaining tumor growth and cell differentiation, also involved in metastatic process, recurrence, and resistance to chemotherapeutic agents. In the present study, performed on KB cell lines, we evaluated the tumor forming potential of CSCs, and their relationship with the HPV infection status. We started our study by identifying the most aggressive cell line on the minimal number of cells being able of growth in vivo in a model of athymic nude mice (BALB/c nu/nu). We used an oral-derived KB cell line separated in the KB-CD133+ and KB-CD133- populations, by using immunomagnetic beads and fluorescence-activated cell sorting (FACS). The separated populations were injected in athymic nude mice (BALB/c nu/nu). Xenograft tumors have been analyzed for tumor size, CD133 expression by immunohistochemistry (IHC) and for DNA HR-HPV integration by in situ hybridization (ISH), comparing CD133-enriched xenograft tumors versus the CD133 non-enriched ones. On standard conditions, the KB cell line has a poor population of glycosylated CD133 marker (<5.0%) when investigated with antibodies versus CD133, and more specifically its glycosylated epitope (AC133). Enriched CD133 KB cells possess a higher capacity of tumor growth in xenograft models of nude mice when compared to KB CD133-negative cells. We observed that the AC133 epitope, extensively used to purifying hematopoietic stem cells, is able to select an epithelial subpopulation of cancer stem cells with aggressive behavior. We retain that CD133 may be a useful target in anticancer strategies including pharmacological and immunological therapies.
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