CD105 was postulated as a renal cell carcinoma (RCC) stem cell marker, and CD133 as a putative RCC progenitor. Hypoxia, a natural microenvironment that prevails in tumors, was also incorporated into the study, especially in terms of the promotion of hypothetical stem-like cell properties.
Within this study, we verify the existence of CD105+ and CD133+ populations in selected papillary subtype RCC (pRCC) cell lines. Both populations were analyzed for correlation with stem-like cell properties, such as stemness gene expression, and sphere and colony formation. For the preliminary analysis, several RCC cell lines were chosen (786-O, SMKT-R2, Caki-2, 796-P, ACHN, RCC6) and the control was human kidney cancer stem cells (HKCSC) and renal cells of embryonic origin (ASE-5063). Four cell lines were chosen for further investigation: Caki-2 (one of the highest numbers of CD105+ cells; primary origin), ACHN (a low number of CD105+ cells; metastatic origin), HKCSC (putative positive control), and ASE-5063 (additional control).
In 769-P and RCC6, we could not detect a CD105+ population. Hypoxia variously affects pRCC cell growth, and mainly diminishes the stem-like properties of cells. Furthermore, we could not observe the correlation of CD105 and/or CD133 expression with the enhancement of stem-like properties.
Based on this analysis, CD105/CD133 cannot be validated as cancer stem cell markers of pRCC cell lines.
BMC cancer. 2017 Jan 05*** epublish ***
Damian Matak, Klaudia K Brodaczewska, Cezary Szczylik, Irena Koch, Adam Myszczyszyn, Monika Lipiec, Slawomir Lewicki, Lukasz Szymanski, Robert Zdanowski, Anna M Czarnecka
Department of Oncology with Laboratory of Molecular Oncology, Military Institute of Medicine, Szaserow 128, 04-141, Warsaw, Poland., Department of Pathomorphology, Institute of Mother and Child, Warsaw, Poland., Department of Regenerative Medicine, Military Institute of Hygiene and Epidemiology, Warsaw, Poland., Department of Oncology with Laboratory of Molecular Oncology, Military Institute of Medicine, Szaserow 128, 04-141, Warsaw, Poland. .