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Seven-transmembrane receptor signaling through beta-arrestin

Sudha K Shenoy1, Robert J Lefkowitz

  • 1Howard Hughes Medical Institute, Durham, NC 27710, USA.

Science'S STKE : Signal Transduction Knowledge Environment
|November 4, 2005
PubMed

Insights

Beta-arrestins, initially known for desensitizing seven-transmembrane receptors (7TMRs), are now recognized as key signaling adaptors. They mediate receptor internalization and regulate diverse cellular responses via pathways like MAPK signaling.

Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Receptor Biology

Background:

  • Cell surface receptors transmit external signals, initiating intracellular pathways and cellular responses.
  • Seven-transmembrane receptors (7TMRs) are the largest receptor family, activating G proteins and second messengers upon agonist stimulation.
  • G protein-coupled receptor kinases phosphorylate activated 7TMRs, leading to beta-arrestin binding and signaling desensitization.

Purpose of the Study:

  • To elucidate the multifaceted roles of beta-arrestins beyond G protein signaling.
  • To highlight beta-arrestins as crucial adaptors in receptor internalization and non-G protein-mediated signaling pathways.
  • To explore beta-arrestin involvement in diverse cellular processes regulated by 7TMRs and other receptor types.

Main Methods:

  • Review of existing literature on seven-transmembrane receptor (7TMR) signaling and beta-arrestin function.
  • Analysis of the molecular interactions between beta-arrestins, 7TMRs, kinases, and signaling cascades.
  • Examination of beta-arrestin roles in receptor internalization and downstream cellular responses.

Main Results:

  • Beta-arrestins not only desensitize G protein signaling but also act as critical adaptors for clathrin-dependent receptor internalization.
  • Beta-arrestins scaffold and modulate the activity of nonreceptor tyrosine kinases and mitogen-activated protein kinase (MAPK) cascades.
  • Beta-arrestins are essential for 7TMR signaling outcomes including cell survival and chemotaxis, and also mediate signaling for receptor tyrosine kinases.

Conclusions:

  • Beta-arrestins possess diverse signaling functions extending beyond their classical role in 7TMR desensitization.
  • Beta-arrestins serve as crucial endocytic adaptors and signal mediators for both 7TMRs and receptor tyrosine kinases.
  • Understanding beta-arrestin's complex roles is vital for comprehending cellular responses to external stimuli.

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