CD133 expression and identification of CD133/nestin positive cells in rhabdomyosarcomas and rhabdomyosarcoma cell lines.
ABSTRACT Background: Co-expression of CD133, cell surface glycoprotein, and nestin, an intermediate filament protein, was determined to be a marker of neural stem cells and of cancer stem cells in neurogenic tumors. Methods: We examined the expression of CD133 and nestin in ten tumor tissue samples taken from patients with rhabdomyosarcomas and in five rhabdomyosarcoma cell lines. Immunohistochemistry and immunofluorescence were used to examine FFPE tumor tissue samples. Cell lines were analyzed by immunofluorescence, immunoblotting, flow cytometry, and RT-PCR. Functional assays (clonogenic in vitro assay and tumorigenic in vivo assay) were also performed using these cell lines. Results: CD133 and nestin were detected in all 10 tumor tissue samples and in all 5 cell lines; however, the frequency of CD133+, Nes+, and CD133+ /Nes + cells, as well as the intensity of fluorescence varied in individual samples or cell lines. The expression of CD133 and nestin was subsequently confirmed in all cell lines by immunoblotting. Furthermore, we observed an increasing expression of CD133 in relation to the cultivation. All cell lines were positive for Oct3/4 and nucleostemin; NSTS-11 cells were also able to form xenograft tumors in mice. Conclusion: Our results represent the first evidence of CD133 expression in rhabdomyosarcoma tissue and in rhabdomyosarcoma cell lines. In addition, the co-expression of CD133 and nestin as well as results of the functional assays suggest a possible presence of cancer cells with a stem-like phenotype in these tumors.
SourceAvailable from: Renata Veselska[Show abstract] [Hide abstract]
ABSTRACT: The aim of this review is to summarize current knowledge on nestin expression in human tumors and corresponding tumor cell lines. Nestin belongs to class VI of the intermediate filaments and it is expressed primarily in mammalian nervous tissue during embryonic development. In adults, nestin occurs only in a small subset of cells and tissues. This protein has been observed in the subventricular zone of the adult mammalian brain, where neurogenesis is localized. Nestin expression has also been detected in various types of human solid tumors, as well as in the corresponding established cell lines. This article provides an up-to-date overview of tumors in which nestin has been found. Another aim of this review is to summarize recent findings on the intracellular localization of nestin in human tumor cells, especially with regard to the possible correlation between nestin expression and the malignant phenotype of transformed cells. Nestin expression in vascular endothelial cells during angiogenesis is also reviewed. Special attention is paid to the detection of nestin in cancer stem cells because this protein, together with the CD133 surface molecule, is considered to be a possible marker of cancer stem cells, especially in tumors of neuroectodermal origin.Neoplasma 01/2010; 57(4):291-8. DOI:10.4149/neo_2010_04_291 · 1.64 Impact Factor