NANOG is a transcription factor that is involved in the self-renewal of embryonic stem cells (ES) and is a critical factor for the maintenance of the undifferentiated state of pluripotent cells. Extensive data in the literature show that the NANOG gene is aberrantly expressed during the development of malignancy in cancer cells. ES and cancer stem cells (CSCs), a subpopulation of cancer cells within the tumor, are thought to share common phenotypic properties. This review describes the role of NANOG in cancer cell proliferation, epithelial-mesenchymal transition (EMT), apoptosis and metastasis. In addition, this paper illustrates a correlation between NANOG and signal transducer and activator of transcription 3 (STAT3) in the maintenance of cancer stem cell properties and multidrug resistance. Together, the available data demonstrate that NANOG is strictly involved in the process of carcinogenesis and is a potential prognostic marker of malignant tumors.
IntroductionIt has been proved that expression of the NANOG gene is observed not only in embryonic-derived malignancies, but also in breast cancer, ovarian cancer, cervix cancer and bladder cancer. NANOG overexpression is correlated with high activity of MMP-2 and MMP-9. The aim of the study was to evaluate the changes in the malignant phenotype of T24 bladder cancer cells with modulated expression of the NANOG gene.Material and methodsHuman urinary bladder cancer cells T24 (HTB-4) were cultivated under standard conditions. Transfection of the cells with silencing constructions was performed with the application of Lipofectamine 2000 (Invitrogen) reagent. Evaluation of changes in the expression level of individual genes was performed using qRTPCR. Changes in the protein level were evaluated using the Human ELISA Kit (Abcam). The invasion capability of transfected cells was tested using Matrigel Invasion Chambers (BD Biosciences). The changes in cell migration were assessed with a wound-healing assay.ResultsThe qRTPCR evaluation showed that silencing the NANOG gene in T24 cells led to the decrease of mRNA for the MMP-2 gene to the level of 62.4% and the MMP-9 gene to the level of 76%. The cells with modulated expression of the NANOG gene migrated slower in the Matrigel invasion assay and in the wound-healing assay. The immunoenzymatic test showed a decrease in the protein level of MMP-9.ConclusionsThe transcriptional activity of the NANOG gene might be connected with some aspects of bladder cancer cell metastasis in vitro and has an influence on MMP-2 and MMP-9 expression levels.
The ongoing development of novel personalized cancer therapies has resulted in the implementation of T-cells enriched with synthetic chimeric antigen receptors, known as chimeric antigen receptors T-cell (CAR-T) cells, into clinical practice. CAR-T cells are able to recognize and bind specific antigens present on the surface of target cellsso-called tumor-associated antigens. This innovative method has been approved for the treatment of hematological malignancies and may also serve as a bridge to hematopoietic stem cell transplantation. The production of the drug containing modified T-cells consists of several steps -leukapheresis, T-cell activation, transduction and expansion of the final CAR-T cells. Activation of CAR-T cells occurs through a pathway independent of the major histocompatibility complex, which is often associated with uncontrolled responses from the immune system and adverse reactions such as cytokine release syndrome. CAR-T therapy can only be performed in certified centers, and requires close cooperation between experienced specialists of different medical disciplines. This is what determines its effectiveness. Every step from collection and cryopreservation, through transport and modification, to thawing and infusion is strictly controlled because it has a critical impact on the quality and efficiency of the drug. Despite its proven benefits, CAR-T therapy remains available only to patients who meet well-defined criteria. These however are liable to change with the emergence of new indications.
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