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Pertussis toxin-induced mitogenesis in human T lymphocytes
N Grenier-Brossette1, I Bourget, J P Breittmayer
1INSERM U210, Faculté de Médecine (Pasteur) Nice, France.
Immunopharmacology
|March 1, 1991
Summary
Pertussis toxin (PT) triggers immune cell proliferation by increasing intracellular calcium and promoting IL-2 production. However, its ADP-ribosyltransferase activity doesn't directly mediate DNA replication signaling.
Area of Science:
- Immunology
- Cellular Biology
- Biochemistry
Background:
- Pertussis toxin (PT) is known to modulate immune responses and induce lymphocyte proliferation.
- Understanding the biochemical mechanisms underlying PT's mitogenic effects is crucial for иммунологических исследований.
Purpose of the Study:
- To investigate the biochemical basis for the mitogenic activity of Pertussis toxin (PT) in human peripheral blood lymphocytes.
- To elucidate the signaling pathways involved in PT-induced lymphocyte activation and proliferation.
Main Methods:
- Human peripheral blood lymphocytes were treated with PT.
- Measurements included cytosolic free calcium concentration, intracellular pH, IL-2 receptor expression, IL-2 production, and T cell proliferation.
- Monocyte-derived IL-1 and IL-6 production was assessed.
- ADP-ribosylation of G proteins was analyzed in relation to mitogen-induced signaling.
Main Results:
- PT induced a rapid increase in cytosolic free calcium and alkalinization via the Na+/H+ antiporter.
- PT stimulated IL-2 receptor expression on CD3+ cells and promoted IL-2 production.
- PT-induced proliferation of CD4+ and CD8+ T cells required accessory cells and cell:cell contact.
- Low-dose PT-induced G protein ADP-ribosylation did not significantly impact PHA-induced calcium increase or IL-2-induced DNA synthesis.
Conclusions:
- Pertussis toxin activates lymphocytes through calcium signaling and IL-2 production, requiring accessory cell interactions.
- The ADP-ribosyltransferase activity of PT is not directly involved in the signaling pathways crucial for DNA replication during lymphocyte proliferation.