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Amplitude-encoded calcium oscillations in fish cells.

N Schweizer1, U Kummer, H Hercht

  • 1Aquatic Ecology and Toxicology Group, Center of Organismic Studies, University of Heidelberg, Im Neuenheimer Feld 504, D-69120 Heidelberg, Germany. nadja.seitz@zoo.uni-heidelberg.de

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Area of Science:

  • Environmental toxicology
  • Cellular physiology
  • Comparative animal biology

Background:

  • Intracellular calcium (Ca2+) signaling is crucial for cellular functions in all organisms.
  • Understanding fish hepatocyte Ca2+ responses is vital for assessing environmental impacts on aquatic life.
  • Differences in Ca2+ signaling between fish and mammals are not fully understood.

Purpose of the Study:

  • To investigate intracellular Ca2+ responses in rainbow trout hepatocytes and the RTL-W1 cell line.
  • To examine the effects of classical agonists and environmental toxicants on fish Ca2+ signaling.
  • To identify molecular mechanisms underlying Ca2+ signaling differences in fish liver cells compared to mammals.

Main Methods:

  • Primary hepatocyte isolation from rainbow trout (Oncorhynchus mykiss).
  • Culturing and stimulation of the permanent fish cell line RTL-W1.
  • Measurement of intracellular Ca2+ dynamics using various agonists and toxicants (e.g., phenylephrine, ATP, 4-nitrophenol, 3,4-dichloroaniline).
  • Bioinformatics and computational analysis of Ca2+ signaling pathways.

Main Results:

  • Ca2+ oscillations were observed in RTL-W1 cells and, to a lesser extent, in primary hepatocytes.
  • Fish cell Ca2+ oscillations were found to be amplitude-encoded, differing from mammalian patterns.
  • Environmental toxicants elicited distinct Ca2+ signaling responses, suggesting potential toxicological interactions.

Conclusions:

  • Rainbow trout liver cells display unique, amplitude-encoded Ca2+ oscillation dynamics.
  • Environmental toxicants can modulate fish Ca2+ signaling, highlighting potential ecotoxicological risks.
  • Bioinformatic analysis is key to understanding fish-specific Ca2+ signaling pathways and their divergence from mammalian systems.