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Cell surface-directed interaction of anthracyclines leads to cytotoxicity and nuclear factor kappaB activation but

N Maestre1, T R Tritton, G Laurent

  • 1Institut Nationale de la Santé et de la Recherche Médicale, Institut Claudius Régaud, Toulouse, France.

Cancer Research
|April 6, 2001
PubMed

Insights

Anthracyclines induce cell death, but apoptosis requires drug internalization. Membrane interaction alone triggers necrosis, not apoptosis, highlighting the importance of intracellular drug action in cancer therapy signaling.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pharmacology

Background:

  • Anthracyclines are DNA intercalators known for their cytotoxic effects.
  • The precise mechanism of anthracycline-induced cell death, particularly apoptosis, is under investigation.
  • It remains unclear if direct drug-DNA interaction is essential for initiating apoptosis signaling.

Purpose of the Study:

  • To investigate the role of anthracycline internalization in inducing apoptosis.
  • To differentiate between cellular responses to membrane-bound versus internalized anthracyclines.
  • To determine if DNA intercalation is necessary for apoptosis signaling.

Main Methods:

  • Utilized myeloid leukemia U937 cell line.
  • Compared cytotoxic effects of free daunorubicin (DNR)/doxorubicin (DOX) with immobilized DNR (iDNR)/DOX (iDOX).
  • Assessed apoptosis markers (ceramide generation, sphingomyelinase activation, PARP cleavage) and NF-κB activation.

Main Results:

  • Both free and immobilized anthracyclines exhibited cytotoxicity.
  • Only free anthracyclines induced apoptosis; immobilized drugs led to necrosis.
  • Nuclear factor-kappaB (NF-κB) activation occurred with both free and immobilized drugs, indicating membrane interaction is sufficient for this pathway.
  • Apoptosis signaling pathways were not activated by immobilized anthracyclines.

Conclusions:

  • Anthracycline internalization is essential for triggering apoptosis.
  • Membrane interaction alone can activate certain signaling pathways like NF-κB but does not induce apoptosis.
  • Cell survival pathways can be initiated independently of intracellular drug-target interactions.

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