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Area of Science:

  • Cellular and Molecular Biology
  • Immunology
  • Biochemistry

Background:

  • Eukaryotic cell chemotaxis toward attractants is well-understood and conserved across species.
  • Chemorepulsion, the movement of cells away from a repellent signal, is less understood.
  • Previous studies identified chemorepulsion pathways in Dictyostelium discoideum.

Purpose of the Study:

  • To investigate the conserved mechanisms of chemorepulsion in human neutrophils.
  • To identify sex-specific differences in neutrophil chemorepulsion.
  • To elucidate the molecular basis of sex dimorphism in innate immune cell motility.

Main Methods:

  • Utilized human neutrophils and Dictyostelium discoideum models.
  • Investigated conserved signaling pathways including Ras, Rac, protein kinase C, PTEN, and ERK1/2.
  • Analyzed the effects of inhibiting Rho-associated kinases and Cdc42.
  • Quantified neutrophil movement, adhesion, actin polymerization, and phosphoinositide levels.
  • Assessed protein abundance and localization.

Main Results:

  • Conserved chemorepulsion pathways in human neutrophils involve Ras, Rac, protein kinase C, PTEN, and ERK1/2, with PI3K and phospholipase C not being necessary.
  • Inhibition of Rho-associated kinases or Cdc42 led to differential responses in male and female neutrophils.
  • Female neutrophils exhibited reduced repulsion, increased persistence, enhanced adhesion, and altered PI(3,4,5)P3 accumulation and actin polymerization compared to male neutrophils in the presence of a chemorepellent.
  • Five proteins involved in chemorepulsion pathways showed differential abundance, with three exhibiting sex-dimorphic localization.

Conclusions:

  • Eukaryotic chemorepulsion mechanisms are conserved, involving specific signaling pathways.
  • Significant sex differences exist in human neutrophil chemorepulsion and motility.
  • These findings reveal a fundamental sex-based difference in innate immune system motility mechanisms.