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PMID:7775586

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Citation

Greene, RM, Lloyd, MR, Uberti, M, Nugent, P and Pisano, MM (1995) Patterns of cyclic AMP-dependent protein kinase gene expression during ontogeny of the murine palate. J. Cell. Physiol. 163:431-40

Abstract

Normal growth and differentiation of embryonic palatal tissue depends on regulated levels of intracellular cAMP. Cyclic AMP-dependent protein kinases (PKA) act to mediate the biological activities of cAMP. PKA isozyme protein profiles demonstrate a clear pattern of temporal alterations in embryonic palatal tissue during its development. In order to ascertain the molecular basis for changing PKA isozyme profiles during palatal ontogeny, the spatial and temporal expression of mRNAs for regulatory (RI alpha, RII alpha, and RII beta) and catalytic (C alpha) subunits of PKA was examined. RNA extracted from murine embryonic palatal tissue (days 12-14 of gestation) was examined by Northern blot analysis. Significant levels of constitutively expressed RI alpha and C alpha mRNA were seen on all days of gestation examined. RI alpha transcripts were substantially less abundant in palate mesenchymal cells in vitro than in palatal tissue in vivo. Levels of RII alpha and RII beta mRNA were highest on gestational day (GD) 12, a period characterized by pronounced palatal tissue growth. In addition, patterns of tissue distribution of RII beta, not previously described, were examined in the developing embryonic palate. A dramatic developmental shift in tissue distribution of RII beta was seen. The isozyme was evenly distributed between palatal epithelial and mesenchymal cells on GD 12 but by GD 14, RII beta was predominantly localized to palatal epithelial cells. Direct activation of adenylate cyclase with forskolin in murine embryonic palate mesenchymal (MEPM) cells resulted in an increase in RII alpha mRNA levels but had no effect on steady state levels of RII beta or C alpha mRNA. In addition, elevation of intracellular levels of cAMP resulted in a shift in the transcriptional profile of RI alpha mRNAs. Results of this study document specific patterns of expression for the genes encoding the various cAMP-dependent protein kinase regulatory and C alpha subunits in murine embryonic palatal tissue. In addition, we have demonstrated adaptational changes of this kinase in MEPM cells in response to conditions of increased intracellular levels of cAMP.

Links

PubMed Online version:10.1002/jcp.1041630302

Keywords

Animals; Cells, Cultured; Cyclic AMP/metabolism; Cyclic AMP-Dependent Protein Kinase RIIalpha Subunit; Cyclic AMP-Dependent Protein Kinase RIalpha Subunit; Cyclic AMP-Dependent Protein Kinase RIbeta Subunit; Cyclic AMP-Dependent Protein Kinases/genetics; Female; Fetus/physiology; Gene Expression; Immunohistochemistry; Intracellular Membranes/metabolism; Male; Mice; Mice, Inbred ICR; Palate/embryology; RNA, Messenger/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

MOUSE:KAP1

acts_upstream_of_or_within

GO:0006468: protein phosphorylation

ECO:0000304: author statement supported by traceable reference used in manual assertion

P

Seeded From UniProt

complete

MOUSE:KAP1

acts_upstream_of_or_within

GO:0009887: animal organ morphogenesis

ECO:0000304: author statement supported by traceable reference used in manual assertion

P

Seeded From UniProt

complete

MOUSE:KAP3

enables

GO:0008603: cAMP-dependent protein kinase regulator activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

MOUSE:KAP0

acts_upstream_of_or_within

GO:0008283: cell population proliferation

ECO:0000304: author statement supported by traceable reference used in manual assertion

P

Seeded From UniProt

complete

MOUSE:KAP0

acts_upstream_of_or_within

GO:0006468: protein phosphorylation

ECO:0000304: author statement supported by traceable reference used in manual assertion

P

Seeded From UniProt

complete

MOUSE:KAP0

acts_upstream_of_or_within

GO:0009887: animal organ morphogenesis

ECO:0000304: author statement supported by traceable reference used in manual assertion

P

Seeded From UniProt

complete

MOUSE:KAP0

enables

GO:0008603: cAMP-dependent protein kinase regulator activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

See also

References

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