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Epac: effectors and biological functions.

Sara S Roscioni1, Carolina R S Elzinga, Martina Schmidt

  • 1Department of Molecular Pharmacology, University of Groningen, A. Deusinglaan 1, 9713 AV, Groningen, The Netherlands.

Naunyn-Schmiedeberg'S Archives of Pharmacology
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Summary

Epac proteins are novel cyclic AMP (cAMP) sensors regulating key cellular functions like proliferation and signaling. This review details their diverse effectors and biological roles, clarifying cAMP signaling pathways.

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Area of Science:

  • Molecular Biology
  • Cell Signaling

Background:

  • Epac1 and Epac2 are cyclic AMP-activated guanine nucleotide exchange factors for Ras-like GTPases.
  • These proteins act as novel cAMP sensors involved in numerous cellular processes.

Purpose of the Study:

  • To review the multi-faceted effectors of Epac proteins.
  • To highlight the diverse biological functions regulated by Epac proteins.
  • To explain controversial signaling properties of cAMP.

Main Methods:

  • Literature review of recent studies on Epac proteins.
  • Analysis of identified Epac effectors and their associated signaling pathways.
  • Synthesis of information on Epac-mediated cellular processes.

Main Results:

  • Epac proteins regulate calcium handling, proliferation, survival, differentiation, polarization, adhesion, transcription, secretion, ion transport, and neuronal signaling.
  • Emerging roles in inflammation and cardiac hypertrophy are indicated.
  • Diverse effectors include Ras/Rho GTPases, phospholipases, kinases, ion channels, and cytoskeletal regulators.

Conclusions:

  • Epac proteins are critical regulators of diverse cellular functions.
  • Understanding Epac effectors clarifies complex cAMP signaling.
  • Epac proteins offer insights into cellular processes and potential therapeutic targets.