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SHR Neuro Cancer Cardio Lipid Metab Microb
Stepan, V; Pausawasdi, N; Ramamoorthy, S; Todisco, A.
The Akt and MAPK signal-transduction pathways regulate growth factor actions in isolated gastric parietal cells.
Gastroenterology. 2004; 127(4):1150-1161
Doi: 10.1053/j.gastro.2004.06.059
Web of Science
PubMed
FullText
FullText_MUG
- Leading authors Med Uni Graz
- Stepan Vinzenz
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- Abstract:
- BACKGROUND & AIMS: Incubation of purified (>95%) canine parietal cells in primary culture with epidermal growth factor for 7-16 hours stimulates H(+)K(+)-adenosine triphosphatase gene expression. In this study, we examined the effect of prolonged stimulation (72 hours) of the parietal cells with epidermal growth factor. METHODS: H(+)K(+)-adenosine triphosphatase protein and gene expression were assessed by immunohistochemistry and Northern blots. Mitogen-activated protein kinase and Akt activation were quantitated by kinase assays and Western blots with specific antiphospho antibodies. Akt overexpression was achieved by adenovirus-mediated gene transfer of a constitutively active Akt gene. RESULTS: Epidermal growth factor changed the morphology of the cultured cells, which acquired the appearance of fusiform cells, and it inhibited H(+)K(+)-adenosine triphosphatase gene expression. Staining of the cells both with anti-H(+)K(+)-adenosine triphosphatase antibodies and with Texas Red-labeled Dolichos biflorus lectin confirmed that the fusiform cells expressed markers of parietal cell differentiation. Epidermal growth factor stimulated mitogen-activated protein kinase with 2 peaks of activation, observed after 5 minutes and 72 hours, whereas it activated Akt after 5 minutes but not 72 hours of incubation. Overexpression of Akt blocked both epidermal growth factor-induced morphological transformation and inhibition of H + K + -adenosine triphosphatase gene expression. Identical results were observed in the presence of the mitogen-activated protein kinase inhibitor PD98059. CONCLUSIONS: Activation of the Akt signal-transduction pathway seems to be a crucial event for the induction of parietal cell maturation and differentiation.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Cell Differentiation -
- Cells, Cultured -
- Dogs -
- Epidermal Growth Factor - pharmacology
- H(+)-K(+)-Exchanging ATPase - genetics
- MAP Kinase Signaling System - physiology
- Parietal Cells, Gastric - cytology
- Protein Subunits -
- Protein-Serine-Threonine Kinases - physiology
- Proto-Oncogene Proteins - physiology
- Proto-Oncogene Proteins c-akt -
- Signal Transduction - physiology