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Negative necrotaxis

R Ragot1

  • 1Centre d'Ecologie Cellulaire pour l'Etude des Cellules du Sang Normal et Leucémique, Hôpital de la Salpêtrière, Paris, France.

Blood Cells
|January 1, 1993
PubMed
Summary

Protists exhibit varied necrotaxis, the movement towards or away from dead cells. Euglena gracilis shows negative necrotaxis, moving away from dead cells, likely due to released cellular content.

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Area of Science:

  • * Protistology
  • * Chemotaxis and Cell Behavior

Background:

  • * Necrotaxis, the directed movement of motile organisms in response to dead cells, is a poorly understood phenomenon.
  • * Previous studies have not comprehensively compared necrotactic responses across diverse protist species.

Purpose of the Study:

  • * To investigate and compare necrotactic responses in various protist species.
  • * To elucidate the role of released cellular content in mediating necrotaxis.

Main Methods:

  • * Observation of living protist strains (Euglena gracilis, Chlamydomonas, Pandorina morum, Chilomonas paramecium, Tetrahymena pyriformis) near cells killed by ruby laser, heat, or mechanical lysis.
  • * Analysis of cellular reactions to dead conspecifics and heterospecifics (Euglena).

Main Results:

  • * Euglena gracilis and Tetrahymena pyriformis exhibited negative necrotaxis (repelled by dead cells).
  • * Chlamydomonas displayed positive necrotaxis (attracted to dead cells).
  • * Pandorina morum showed no reaction to dead colonies.
  • * Released Euglena cell content acted as a repellent to intact Euglena cells.

Conclusions:

  • * Necrotaxis in protists is species-specific and can be influenced by the method of cell death.
  • * Released cellular content plays a crucial role in necrotaxis, acting as attractants or repellents based on chemical composition.
  • * Cellular sensitivity, including ion channels and chemoreceptors, is vital for mediating these responses.

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