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In vitro and in vivo characterization of cancer stem cell subpopulations in oral squamous cell carcinoma
Author(s) -
Amôr Nádia Ghinelli,
Buzo Rodrigo Fonseca,
Ortiz Rafael Carneiro,
Lopes Nathália Martins,
Saito Luciana Mieli,
Mackenzie Ian Campbell,
Rodini Camila Oliveira
Publication year - 2021
Publication title -
journal of oral pathology and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 83
eISSN - 1600-0714
pISSN - 0904-2512
DOI - 10.1111/jop.13101
Subject(s) - cd44 , cancer stem cell , cancer research , carcinogenesis , phenotype , biology , cancer , metastasis , in vivo , stem cell , cancer cell , tumor progression , cell , pathology , immunology , medicine , microbiology and biotechnology , genetics , gene
Background Despite advances in cancer diagnosis and therapeutics, the overall 5‐year survival rate of oral squamous cell carcinoma (OSCC) remains low. Tumor formation, progression, recurrence, and chemo‐resistance are associated with the presence of cancer stem cells (CSC) that show phenotypic heterogeneity, but how they influence tumor behavior remains poorly understood. We aimed to describe how two CSC phenotypes from an OSCC cell line, CD44 High ESA High (Epi‐CSC) and CD44 High ESA Low (EMT‐CSC), behave in vitro and in vivo. Methods In vitro behavior of FACS‐sorted Epi‐CSC and EMT‐CSC from OSCC cells was characterized by their ability to form colonies, migrate, proliferate, and to invade a solid matrix. In vivo experiments were conducted in immunodeficient (NOD/SCID) mice by orthotopic xenografting of FACS‐sorted OSCC subpopulations. Results In vitro, the Epi‐CSC phenotype was more proliferative and generated more holoclones than the EMT phenotype. On the other hand, EMT‐CSC migrate and invaded more than Epi‐CSC cells in 3D culture, suggesting the CSC phenotype affects tumor cell behavior. When inoculated orthotopically into the tongues of immunodeficient mice, both subpopulations generated OSCC, but EMT‐CSC formed fewer and smaller tumors. Conclusions Our results suggest that while cells in the Epi‐CSC form the subpopulation that enables tumor growth, the EMT‐CSC are related to migration and invasion. Clinically, this may reflect the importance of Epi‐CSC for tumorigenesis and of the EMT‐CSC for metastasis and highlights that variation in the proportion of CSC phenotypes from patient to patient may be relevant to the design of individual treatment protocols.