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Glucocorticoid-induced DNA fragmentation: role of protein-kinase-C activity

G Migliorati1, M C Pagliacci, F D'Adamio

  • 1Istituto di Farmacologia Medica, Perugia University Medical School, Italy.

Pharmacological Research
|September 1, 1992
PubMed

Insights

Glucocorticoid hormones and IL-2 promote apoptosis via PKC. Interleukin-4 inhibits this process, demonstrating that protein kinase C activation differentially regulates thymocyte survival.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Glucocorticoid hormones (GCH) and Interleukin-2 (IL-2) are known to induce apoptosis.
  • Protein kinase C (PKC) is implicated in regulating cell death pathways.
  • Interleukin-4 (IL-4) has been suggested to modulate immune cell survival.

Purpose of the Study:

  • To investigate the role of PKC in mediating apoptosis induced by GCH and IL-2.
  • To determine the effect of IL-4 on GCH- and IL-2-induced apoptosis.
  • To elucidate the mechanisms by which different stimuli regulate thymocyte survival through PKC.

Main Methods:

  • Thymocyte culture and treatment with GCH, IL-2, and IL-4.
  • Assessment of apoptotic cell death using flow cytometry and Annexin V staining.
  • Measurement of PKC activity in response to different cytokine treatments.

Main Results:

  • GCH and IL-2 significantly increased thymocyte apoptosis through a PKC-dependent pathway.
  • IL-4 treatment inhibited PKC activity and counteracted the apoptotic effects of GCH and IL-2.
  • Co-administration of GCH/IL-2 with IL-4 resulted in antagonistic effects on apoptosis.
  • PKC activation was shown to be crucial for both the induction and inhibition of thymocyte apoptosis.

Conclusions:

  • PKC activation is a key mediator in the apoptotic response of thymocytes to GCH and IL-2.
  • IL-4 exerts a protective effect against apoptosis by inhibiting PKC activity.
  • The balance of PKC activation by different signaling pathways determines thymocyte survival outcomes.

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