title: Implication of Reg I in human pancreatic duct-like cells in vivo in the pathological pancreas and in vitro during exocrine dedifferentiation.
abstract: A feature associated frequently with the pathologic pancreas is the presence of tubular complexes produced by a phenotypic modulation of acinar cells that take on the characteristics of ductular cells. Since the type I Reg gene, an acinar cell product, is increased in the pancreas following an acinar injury, we aimed to evaluate whether the Reg I protein might be involved in this dedifferentiation process in the human pancreas. We studied duct-like structures in fixed human pathologic pancreatic tissues and human cells with a ductal phenotype obtained by culturing human exocrine preparations. Immunocytochemistry, Western blotting, and RT-PCR were applied for detection of type I Reg. Reg I was observed not only in acinar cells but also in the duct-like cells and dilated duct cells, both positive for cytokeratin 19. However, none of the other acinar markers was observed in these cells. In vitro, human acinar cells dedifferentiated, losing their acinar phenotype, but expression of Reg I remained constant throughout the culture duration. Furthermore, Reg I was not associated with proliferation. We demonstrated that Reg I expression was linked to acinar cell dedifferentiation. We postulate that Reg I might be used as a marker to understand the events leading to phenotypic changes of acinar cells to address the physiological role of Reg I in the pancreas.
authors.affiliation: Groupe de Recherche sur les Glandes Exocrines, Faculté de Médecine, Marseille, France.
authors.forename: Didier
authors.initials: D
authors.lastname: Sanchez
authors.forename: Valery
authors.initials: V
authors.lastname: Gmyr
authors.forename: Julie
authors.initials: J
authors.lastname: Kerr-Conte
authors.forename: Gunter
authors.initials: G
authors.lastname: Kloppel
authors.forename: Michael E
authors.initials: ME
authors.lastname: Zenilman
authors.forename: Odette
authors.initials: O
authors.lastname: Guy-Crotte
authors.forename: François
authors.initials: F
authors.lastname: Pattou
authors.forename: Catherine
authors.initials: C
authors.lastname: Figarella
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers; D002135:Calcium-Binding Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D002454:Cell Differentiation; D002455:Cell Division; D016764:Cell Polarity; D003550:Cystic Fibrosis / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005786:Gene Expression Regulation; D006023:Glycoproteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D006801:Humans; D007633:Keratins / Q000032:analysis; D051847:Lithostathine; D008297:Male; D010179:Pancreas / Q000166:cytology / Q000378:metabolism*; D010183:Pancreatic Ducts / Q000166:cytology; D010641:Phenotype; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D015415:Biomarkers; D002135:Calcium-Binding Proteins; D006023:Glycoproteins; D051847:Lithostathine; C497617:REG1A protein, human; D007633:Keratins