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Related Experiment Videos

Ionic responses to epidermal growth factor in zebrafish cells

M P Peppelenbosch1, L G Tertoolen, S W de Laat

  • 1Hubrecht Laboratory, Netherlands Institute for Developmental Biology, Utrecht.

Experimental Cell Research
|May 1, 1995
PubMed
Summary

Ionic signaling in response to epidermal growth factor (EGF) is conserved across species. Zebrafish cells show EGF-induced calcium influx and currents, similar to mammalian cells, highlighting conserved growth factor action mechanisms.

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Area of Science:

  • Cellular biology
  • Comparative physiology
  • Molecular signaling

Background:

  • Mammalian cells exhibit early ionic changes, including calcium influx and hyperpolarization, upon epidermal growth factor (EGF) stimulation.
  • The evolutionary conservation and physiological significance of these EGF-induced ionic changes remain largely undetermined.
  • Investigating ionic signaling in diverse species can elucidate fundamental roles in growth factor action.

Purpose of the Study:

  • To determine if EGF-elicited ionic changes observed in mammalian cells are conserved in non-mammalian vertebrates.
  • To investigate the role of calcium influx and leukotriene synthesis in EGF-induced signaling in zebrafish.
  • To establish the evolutionary importance of ionic signaling in growth factor-mediated cellular responses.

Main Methods:

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  • Isolation and culture of embryonic zebrafish cell lines.
  • Whole-cell patch-clamp recording to measure transmembrane currents.
  • Application of epidermal growth factor (EGF) and measurement of ionic events.
  • Assessment of the effects of leukotriene synthesis inhibitors on EGF-induced currents.

Main Results:

  • Epidermal growth factor (EGF) receptor activation in zebrafish cells induced outward currents dependent on extracellular calcium influx.
  • These EGF-induced transmembrane currents were abolished by inhibitors of leukotriene synthesis.
  • The observed ionic signaling patterns in zebrafish mirror those previously documented in mammalian cell lines.

Conclusions:

  • Ionic signaling pathways activated by epidermal growth factor (EGF) are evolutionarily conserved, extending beyond mammalian cells.
  • Calcium influx and leukotriene synthesis are critical components of conserved EGF-induced ionic signaling.
  • These findings underscore the fundamental importance of ionic signaling in growth factor action across different species.