title: PRL-1 PTPase expression is developmentally regulated with tissue-specific patterns in epithelial tissues.
abstract: The mechanisms controlling tyrosine phosphorylation of cellular proteins are important in the regulation of many cellular processes, including development and differentiation. Protein tyrosine phosphatases (PTPases) may be as important as protein tyrosine kinases (PTKs) in these processes. PRL-1 is a distinct PTPase originally identified as an immediate-early gene in liver regeneration whose expression is associated with growth in some tissues but with differentiation in others. We now demonstrate that the PRL-1 protein is expressed during development in a number of digestive epithelial tissues. It is expressed at variable time points in the developing intestine, but its expression is limited to the developing villus enterocytes. In the gastric epithelium, PRL-1 expression in the adult is restricted to zymogen cells. PRL-1 is also expressed in the developing liver and esophagus and in the epithelia of the kidney and lung. In each of these contexts, the expression of PRL-1 is associated with terminal differentiation, suggesting that it may play a role in this important developmental process.
authors.affiliation: Division of Gastroenterology, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6145, USA.
authors.forename: W
authors.initials: W
authors.lastname: Kong
authors.forename: G P
authors.initials: GP
authors.lastname: Swain
authors.forename: S
authors.initials: S
authors.lastname: Li
authors.forename: R H
authors.initials: RH
authors.lastname: Diamond
mesh_terms: D000367:Age Factors; D000818:Animals; D002454:Cell Differentiation / Q000502:physiology; D004847:Epithelial Cells / Q000166:cytology / Q000201:enzymology; D004947:Esophagus / Q000166:cytology / Q000196:embryology / Q000201:enzymology; D018507:Gene Expression Regulation, Developmental; D017874:Immediate-Early Proteins / Q000235:genetics*; D007413:Intestinal Mucosa / Q000166:cytology / Q000196:embryology / Q000201:enzymology*; D007668:Kidney / Q000166:cytology / Q000196:embryology / Q000201:enzymology; D008099:Liver / Q000166:cytology / Q000196:embryology / Q000201:enzymology*; D008168:Lung / Q000166:cytology / Q000196:embryology / Q000201:enzymology; D017027:Protein Tyrosine Phosphatases / Q000235:genetics*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction / Q000502:physiology; D013270:Stomach / Q000166:cytology / Q000196:embryology / Q000201:enzymology
chemical_list: D017874:Immediate-Early Proteins; D017027:Protein Tyrosine Phosphatases; C490199:Ptp4a1 protein, rat