Signaling from beta1- and beta2-adrenergic receptors is defined by differential interactions with PDE4

EMBO J. 2008 Jan 23;27(2):384-93. doi: 10.1038/sj.emboj.7601968. Epub 2008 Jan 10.

Abstract

Beta1- and beta2-adrenergic receptors (betaARs) are highly homologous, yet they play clearly distinct roles in cardiac physiology and pathology. Myocyte contraction, for instance, is readily stimulated by beta1AR but not beta2AR signaling, and chronic stimulation of the two receptors has opposing effects on myocyte apoptosis and cell survival. Differences in the assembly of macromolecular signaling complexes may explain the distinct biological outcomes. Here, we demonstrate that beta1AR forms a signaling complex with a cAMP-specific phosphodiesterase (PDE) in a manner inherently different from a beta2AR/beta-arrestin/PDE complex reported previously. The beta1AR binds a PDE variant, PDE4D8, in a direct manner, and occupancy of the receptor by an agonist causes dissociation of this complex. Conversely, agonist binding to the beta2AR is a prerequisite for the recruitment of a complex consisting of beta-arrestin and the PDE4D variant, PDE4D5, to the receptor. We propose that the distinct modes of interaction with PDEs result in divergent cAMP signals in the vicinity of the two receptors, thus, providing an additional layer of complexity to enforce the specificity of beta1- and beta2-adrenoceptor signaling.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Newborn
  • Cell Line
  • Cells, Cultured
  • Cyclic AMP / metabolism
  • Cyclic Nucleotide Phosphodiesterases, Type 4 / genetics
  • Cyclic Nucleotide Phosphodiesterases, Type 4 / metabolism*
  • Humans
  • Immunoprecipitation
  • Mice
  • Models, Biological
  • Muscle Cells / cytology
  • Muscle Cells / metabolism
  • Promoter Regions, Genetic / genetics
  • Protein Binding
  • Protein Isoforms / genetics
  • Protein Isoforms / metabolism
  • Receptors, Adrenergic, beta-1 / genetics
  • Receptors, Adrenergic, beta-1 / metabolism*
  • Receptors, Adrenergic, beta-1 / physiology
  • Receptors, Adrenergic, beta-2 / genetics
  • Receptors, Adrenergic, beta-2 / metabolism*
  • Receptors, Adrenergic, beta-2 / physiology
  • Signal Transduction

Substances

  • Protein Isoforms
  • Receptors, Adrenergic, beta-1
  • Receptors, Adrenergic, beta-2
  • Cyclic AMP
  • Cyclic Nucleotide Phosphodiesterases, Type 4