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     <dc:title xml:lang="fr">Identification de peptides ciblant les cholangiocytes et cellules souches cancéreuses humaines issus de la lignée d’hépatome HepaRG par la technique de phage display
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     <dcterms:alternative xml:lang="en">Identification of peptides targeting cholangiocytes and human tumor stem cells derived from HepaRG hepatoma cell line using the phage display technology</dcterms:alternative>
     <dc:subject xml:lang="fr">Phage display</dc:subject><dc:subject xml:lang="fr">peptides</dc:subject><dc:subject xml:lang="fr">cholangiocytes</dc:subject><dc:subject xml:lang="fr">cellules souches cancéreuses</dc:subject><dc:subject xml:lang="fr">cholangiocarcinome</dc:subject><dc:subject xml:lang="fr">carcinome hépatocellulaire</dc:subject><dc:subject xml:lang="fr">cellules HepaRG</dc:subject>
     <dc:subject xml:lang="en">Phage display</dc:subject><dc:subject xml:lang="en">peptides</dc:subject><dc:subject xml:lang="en">cholangiocyte</dc:subject><dc:subject xml:lang="en">, cancer stem cells, cholangiocarcinoma</dc:subject><dc:subject xml:lang="en">hepatocellular</dc:subject><dc:subject xml:lang="en">carcinoma</dc:subject><dc:subject xml:lang="en">HepaRG cells.</dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027338606">Peptides</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027651711">Cellules souches</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="143757857">Carcinome hépatocellulaire</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="170890155">Voies biliaires -- Maladies</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Notre laboratoire a établi et caractérisé la lignée d’hépatome humain HepaRG constituée de cellules progénitrices bipotentes capables de se différencier en hépatocytes et cholangiocytes, et d’une fraction de cellules souches cancéreuses (CSC-H). Ces cholangiocytes et CSC-H constituent de nouveaux modèles pertinents pour des études fondamentales et l’évaluation de nouvelles voies thérapeutiques ciblant ces cellules hépatiques. Les objectifs de mon projet étaient d’identifier des peptides ciblant les hépatocytes humains, les cholangiocytes et les CSCs par la technique de phage display et d’évaluer leur(s) effet(s) biologique(s). Par cette approche, nous avons identifié 1 peptide présentant une très forte liaison aux cholangiocytes et 3 peptides se fixant aux CSC-H. Le peptide 11 qui se fixe aux cholangiocytes présente une homologie partielle avec des protéines membranaires bactériennes. Nous avons établi un modèle d’infection de cholangiocytes par les bactéries de la souche Providencia Stuartii et montré que le peptide 11 inhibe l’internalisation de ces bactéries par ces cellules. D’autre part, les 3 peptides (Pep-55, 60,114) qui ciblent les CSC-H induisent des changements morphologiques lorsqu’ils sont ajoutés au milieu de culture des cellules HepaRG suggérant une activité biologique régulation la prolifération, la diffférenciation et/ou l’adhésion cellulaire. En conclusion, nous avons identifié des peptides nouveaux qui pourraient constituer des outils d’étude et de ciblage des cholangiocytes et des CSC-H.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">Our laboratory has established and characterized the HepaRG human hepatoma cell line consisting in bipotent progenitor cells capable of differentiating into hepatocytes and cholangiocytes, and a fraction of cancer stem cells (H-CSC). These cholangiocytes and HCSC are new models relevant for fundamental studies and evaluation of new therapeutic pathways targeting these liver cells. The objectives of my project were to identify peptides targeting human hepatocytes,cholangiocytes and H- CSC using the phage display technique and to evaluate their biological effect(s). Using this approach, we identified 1 peptide exhibiting a very strong binding to cholangiocytes and 3 peptides binding to H-CSC. Peptide 11 which binds to cholangiocytes shows a partial homology with bacterial membrane proteins. We established a model of cholangiocyte infection by the bacteria of the Providencia Stuartii strain and showed that peptide 11 inhibits the internalization of bacteria by these cells. On the other hand, the 3 peptides (Pep-55, 60,114) that target the HCSC induce morphological changes when added to the culture medium of HepaRG cells suggesting a biological activity regulating proliferation, differentiation and/or cell adhesion. In conclusion, we identified new peptides that  could be valuable tools for studying and targeting cholangiocytes and H-CSC.</dcterms:abstract>
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