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Updated: Jan 1, 2026

A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
12:27

A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors

Published on: June 8, 2022

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Sphingosine 1-phosphate activates Erk-1/-2 by transactivating epidermal growth factor receptor in rat-2 cells

J H Kim1, J H Kim, W K Song

  • 1Department of Life Science, Kwangju Institute of Science and Technology, Korea.

IUBMB Life
|February 24, 2001
PubMed

Insights

Sphingosine 1-phosphate (S1P) activates extracellular signal-regulated kinase (Erk) 1 and 2 in Rat-2 cells. This process involves the epidermal growth factor receptor and protein kinase C, linking Ras signaling to Erk activation.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Signal transduction

Background:

  • Extracellular signal-regulated kinases (Erk) 1 and 2 are key regulators of cellular processes.
  • Sphingosine 1-phosphate (S1P) is a bioactive lipid mediator involved in various cellular functions.
  • Understanding the signaling cascades activated by S1P is crucial for deciphering cellular responses.

Observation:

  • S1P treatment induced a dose-dependent activation of Erk-1/-2 in Rat-2 cells.
  • Pertussis toxin, dominant-negative Ras (RasN17), Raf, or MEK-1/-2 inhibition blocked S1P-induced Erk-1/-2 activation.
  • Inhibition of epidermal growth factor (EGF) receptor tyrosine kinase suppressed S1P-induced Erk-1/-2 activation.

Findings:

  • S1P activates Erk-1/-2 through a pathway involving the EGF receptor tyrosine kinase.
  • Protein kinase C (PKC) plays a regulatory role in EGF receptor activation leading to Erk-1/-2 activation.
  • PKC inhibition enhanced S1P-induced Erk-1/-2 activation, suggesting a negative feedback mechanism.

Implications:

  • These findings elucidate a novel signaling pathway where S1P activates the EGF receptor via a PKC-dependent mechanism.
  • This pathway connects Ras signaling to Erk-1/-2 activation in Rat-2 cells.
  • The study provides insights into the complex interplay of signaling molecules regulating cell growth and survival.

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