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Transforming growth factors beta 1 and beta 2 as well as milk growth factor decrease anti-CD3-induced proliferation

M Stoeck1, H Sommermeyer, S Miescher

  • 1Ludwig Institute for Cancer Research, Epalinges, Switzerland.

FEBS Letters
|June 5, 1989
PubMed

Insights

Porcine transforming growth factor-beta 1 and -beta 2 (pTGF-beta) and milk growth factor (MGF) inhibit human lymphocyte proliferation. However, these growth factors do not affect intracellular Ca2+ levels or protein kinase C activation.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Lymphocyte proliferation is a critical immune response.
  • Transforming growth factor-beta (TGF-beta) and milk growth factor (MGF) are known to modulate cellular processes.

Purpose of the Study:

  • To investigate the effect of porcine transforming growth factor-beta 1 and -beta 2 (pTGF-beta 1 and -beta 2) and milk growth factor (MGF) on anti-CD3 antibody-induced human lymphocyte proliferation.
  • To determine if these growth factors impact key signaling pathways involved in T-cell activation, specifically intracellular calcium (Ca2+) increase and protein kinase C (PKC) activation.

Main Methods:

  • Human lymphocytes were cultured and stimulated with anti-CD3 antibodies.
  • Porcine transforming growth factor-beta 1 and -beta 2 (pTGF-beta 1 and -beta 2) and milk growth factor (MGF) were added at a concentration of 1 ng/ml.
  • Lymphocyte proliferation was measured.
  • Intracellular Ca2+ levels and protein kinase C activation and translocation were assessed in response to anti-CD3 stimulation in the presence of the growth factors.

Main Results:

  • Both pTGF-beta 1 and -beta 2, along with MGF, significantly inhibited the proliferation of human lymphocytes induced by anti-CD3 antibodies at 1 ng/ml.
  • The anti-CD3-mediated increase in intracellular Ca2+ was not significantly affected by the addition of pTGF-beta or MGF.
  • Similarly, the activation and translocation of protein kinase C (PKC) induced by anti-CD3 antibodies remained unaffected by these growth factors.

Conclusions:

  • Porcine TGF-beta and MGF exhibit inhibitory effects on T-cell proliferation in humans.
  • These growth factors do not interfere with early T-cell activation events such as calcium mobilization and PKC signaling.
  • The findings suggest a specific mechanism of action for TGF-beta and MGF on lymphocyte proliferation, downstream of initial T-cell receptor signaling.

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