cAMP-dependent protein kinase activation affects vasopressin V2-receptor number and internalization in LLC-PK1 renal epithelial cells

David A. Jans, Brian A. Hemmings

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The relationship between activation of the cAMP-dependent protein kinase (cAMP-PK) and ligand binding and internalization by the vasopressin renal (V2-type) receptor of LLC-PK1 renal epithelial cells was examined. Upon cAMP-PK activation through 1 h treatment with the cAMP analogue 8-bromo-cAMP (BrcA), a marked reduction in V2-receptor steady state number and internalization in LLC-PK1 cells was effected. In cells treated for 17 h with BrcA and hence down-regulated for cAMP-PK1 the V2-receptor number was normal but internalization was markedly reduced. Cells of the LLC-PK1 mutant FIB4, which possesses about 10% parental cAMP-PK catalytic subunit activity, exhibited lower V2-receptor steady state number and internalization in comparison to untreated LLC-PK1 cells. A negative correlation was thus evident between cAMP-PK activation and V2-receptor number and internalization. Phosphorylation by cAMP-PK may effect ligand-independent removal of receptor from the plasma membrane.

Original languageEnglish
Pages (from-to)267-271
Number of pages5
JournalFEBS Letters
Issue number1-2
Publication statusPublished - 9 Apr 1991
Externally publishedYes


  • cAMP-dependent protein kinase
  • Down-regulation
  • Penal epithelial cell
  • Vasopressin V-receptor internalization

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