Specific enrichment of the RNA-binding proteins PCBP1 and PCBP2 in chief cells of the murine gastric mucosa.
RNA-binding proteins and corresponding post-transcriptional controls play critical roles in gene expression. The poly-(C) binding proteins, PCBPs (αCPs, hnRNPEs), comprise a well-characterized family of abundant RNA-binding proteins that impact on RNA processing in the nucleus as well as mRNA stability and translation in the cytoplasm. Here we demonstrate that PCBP1 and PCBP2 are abundantly expressed in the gastric epithelium with prominent enrichment in specific cell types within the gastric glandular mucosa. The spatial and intracellular patterns of PCBP1 and PCBP2 expression in these regions are highly correlated. Remarkably, we observe that these proteins are present in the nuclear and cytoplasmic compartments of zymogenic chief cells while they are restricted to the nuclear compartment in acid-secreting parietal cells and poorly expressed in pit cells that line the gland exit. This specificity of expression patterns and subcellular localization of PCBP1 and PCBP2, along with their appearance in the precursor tissues of the gastric epithelium during early postnatal development, suggests these RNA-binding proteins play specific roles in cell differentiation and organismal development within the gastric glandular epithelium.
Division of Gastroenterology, Hepatology and Nutrition, The Children's Hospital of Philadelphia, Philadelphia, PA, United States; Department of Genetics, University of Pennsylvania, Philadelphia, PA, United States.
Louis R
LR
Ghanem
Department of Genetics, University of Pennsylvania, Philadelphia, PA, United States.
Priya
P
Chatterji
Department of Genetics, University of Pennsylvania, Philadelphia, PA, United States; Department of Medicine, University of Pennsylvania, Philadelphia, PA, United States. Electronic address: liebhabe@mail.med.upenn.edu.
Stephen A
SA
Liebhaber
D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D002466:Cell Nucleolus / Q000378:metabolism; D019872:Chief Cells, Gastric / Q000378:metabolism*; D003593:Cytoplasm / Q000378:metabolism; D004268:DNA-Binding Proteins; D005455:Fluorescent Antibody Technique; D005753:Gastric Mucosa / Q000166:cytology* / Q000378:metabolism*; D005786:Gene Expression Regulation; D051379:Mice; D009928:Organ Specificity / Q000235:genetics; D011485:Protein Binding; D021381:Protein Transport; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D013234:Stem Cells / Q000378:metabolism
D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C121375:Pcbp1 protein, mouse; C501904:Pcbp2 protein, mouse; D016601:RNA-Binding Proteins
Chief cells; Gastric epithelium; Mouse stomach; PCBP; Parietal cells; RNA-binding proteins; hnRNP