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| 1 | Pancreatic cancer stem cell markers and exosomes-the incentive push显示文摘Pancreatic cancer(Pa Ca) has the highest death rate and incidence is increasing. Poor prognosis is due to late diagnosis and early metastatic spread, which is ascribed to a minor population of so called cancer stem cells(CSC) within the mass of the primary tumor. CSC are defined by biological features, which they share with adult stem cells like longevity, rare cell division, the capacity for self renewal, differentiation, drug resistance and the requirement for a niche. CSC can also be identified by sets of markers, which for pancreatic CSC(Pa-CSC) include CD44v6, c-Met, Tspan8, alpha6beta4, CXCR4, CD133, Ep CAM and claudin7. The functional relevance of CSC markers is still disputed. We hypothesize that Pa-CSC markers play a decisive role in tumor progression. This is fostered by the location in glycolipid-enriched membrane domains, which function as signaling platform and support connectivity of the individual Pa-CSC markers. Outsidein signaling supports apoptosis resistance, stem cell gene expression and tumor suppressor gene repression as well as mi RNA transcription and silencing. Pa-CSC markers also contribute to motility and invasiveness. By ligand binding host cells are triggered towards creating a milieu supporting Pa-CSC maintenance. Furthermore, CSC markers contribute to the generation, loading and delivery of exosomes, whereby CSC gain the capacity for a cell-cell contact independent crosstalk with the host and neighboring non-CSC. This allows PaCSC exosomes(TEX) to reprogram neighboring nonCSC towards epithelial mesenchymal transition and to stimulate host cells towards preparing a niche for metastasizing tumor cells. Finally, TEX communicate with the matrix to support tumor cell motility, invasion and homing. We will discuss the possibility that CSC markers are the initial trigger for these processes and what is the special contribution of CSC-TEX. | Sarah Heiler Zhe Wang Margot Zoller | 2016 | World Journal of Gastroenterology2016，22，26： | 8 |
| 2 | Emerging role of microRNAs in cancer stem cells:Implications in cancer therapy显示文摘A small subset of cancer cells that act as tumor initiating cells or cancer stem cells(CSCs) maintain self-renewal and growth promoting capabilities of cancer and are responsible for drug/treatment resistance,tumor recurrence and metastasis. Due to their potential clinical importance,many researchers have put their efforts over decades to unravel the molecular mechanisms that regulate CSCs functions. Micro RNAs(mi RNAs) which are 21-23 nucleotide long,endogenous noncoding RNAs,regulate gene expression through gene silencing at post-transcriptional level by binding to the 3'-untranslated regions or the open reading frames of target genes,thereby result in target mR NA degradation or its translational repression and serve important role in several cellular,physiological and developmental processes. Aberrant mi RNAs expression and their implication in CSCs regulation by controlling asymmetric cell division,drug/treatment resistance and metastasis make mi RNAs a tool of great therapeutic potential against cancer. Recent advancements on the biological complexities of CSCs,modulation in CSCs properties by mi RNA network and development of mi RNA based treatment strategies specifically targeting the CSCs as an attractive therapeutic targets for clinical application are being critically analysed. | Minal Garg | 2015 | World Journal of Stem Cells2015，7，8： | 4 |
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