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"Ins and outs" of seven-transmembrane receptor signalling to ERK

Tim D Werry1, Patrick M Sexton, Arthur Christopoulos

  • 1Department of Pharmacology, University of Melbourne, Parkville, Victoria 3010, Australia.

Trends in Endocrinology and Metabolism: TEM
|December 29, 2004
PubMed

Insights

Extracellular-signal-regulated kinases (ERK1/2) are regulated by seven-transmembrane-spanning receptors (7TMRs) through complex, cell-dependent pathways. Recent findings reveal ERK signaling may involve non-G protein mechanisms and receptor tyrosine kinase transactivation.

Area of Science:

  • Cellular signaling
  • Molecular biology
  • Biochemistry

Background:

  • Extracellular-signal-regulated kinases 1 and 2 (ERK1/2) are key components of the mitogen-activated protein kinase (MAPK) pathway.
  • Seven-transmembrane-spanning receptors (7TMRs) are crucial regulators of cellular responses, often activating ERK1/2.
  • The precise mechanisms of 7TMR-mediated ERK activation are complex and cell-type specific.

Purpose of the Study:

  • To explore the intricate regulation of ERK1/2 by 7TMRs.
  • To investigate potential non-G protein mediated signaling pathways involved in 7TMR-ERK activation.
  • To understand the role of receptor tyrosine kinase (RTK) transactivation in 7TMR signaling.

Main Methods:

  • Literature review of studies on MAPK/ERK signaling pathways.
  • Analysis of research on 7TMR activation and downstream effectors.
  • Examination of emerging models of RTK transactivation.

Main Results:

  • 7TMR regulation of ERK1/2 is highly complex and varies significantly across different cell types.
  • Evidence suggests that some 7TMR-linked ERK pathways may not solely rely on G protein mediation.
  • The 'inside-out' model of RTK transactivation by 7TMRs provides new insights into ERK signaling.

Conclusions:

  • The regulation of ERK1/2 by 7TMRs is multifaceted, involving both G protein-dependent and potentially independent pathways.
  • RTK transactivation represents a significant mechanism contributing to the complexity of 7TMR-mediated mitogenic signaling.
  • Further research is needed to fully elucidate the diverse signaling networks governing ERK activation by 7TMRs.

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