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Transforming growth factor-beta 1 is chemotactic for interleukin-2-activated natural killer cells

A A Maghazachi1, A al-Aoukaty

  • 1Northeastern Ontario Regional Cancer Centre, Sudbury, Canada.

Natural Immunity
|March 1, 1993
PubMed

Insights

Transforming growth factor-beta 1 (TGF-beta 1) attracts interleukin-2-activated natural killer (IANK) cells. This cell migration involves calcium mobilization and protein kinase C signaling pathways.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-2-activated natural killer (IANK) cells play a crucial role in immune responses.
  • The migration of immune cells is essential for effective immune surveillance and response.
  • Transforming growth factor-beta 1 (TGF-beta 1) is a pleiotropic cytokine with known roles in immune modulation.

Purpose of the Study:

  • To investigate the effect of TGF-beta 1 on the in vitro motility of IANK cells.
  • To elucidate the signaling pathways involved in TGF-beta 1-mediated IANK cell chemotaxis.

Main Methods:

  • Modified Boyden chamber assay to assess cell migration.
  • Binding assays using biotinylated TGF-beta to detect receptor expression.
  • Inhibition studies using protein kinase C inhibitors (staurosporine, H7) and a calcium inhibitor (TMB-8).
  • Fura-2-AM loaded-cell assay to measure intracellular calcium mobilization.

Main Results:

  • Low doses of TGF-beta 1 (0.01-0.1 ng/ml) demonstrated chemotactic activity for IANK cells.
  • IANK cells express receptors for TGF-beta 1.
  • TGF-beta 1-induced chemotaxis was significantly inhibited by protein kinase C inhibitors.
  • Inhibition of intracellular calcium (Ca2+) mobilization also blocked TGF-beta 1-induced chemotaxis.
  • TGF-beta 1 induced the recruitment of intracellular Ca2+ in IANK cells.

Conclusions:

  • TGF-beta 1 acts as a chemoattractant for IANK cells.
  • The chemotactic effect of TGF-beta 1 on IANK cells is mediated through protein kinase C and calcium mobilization pathways.
  • These findings contribute to understanding the regulation of natural killer cell migration in immune responses.

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