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Apoptosis: biochemical aspects and clinical implications.

Frederick L Kiechle1, Xinbo Zhang

  • 1Department of Clinical Pathology, William Beaumont Hospital, 3601 West 13 Mile Road, Royal Oak, MI 48073-6769, USA. fkeichle@beaumont.edu

Clinica Chimica Acta; International Journal of Clinical Chemistry
|November 6, 2002
PubMed
Summary

Apoptosis, a programmed cell death, differs from necrosis. Cancer therapies leverage apoptosis, with agents like Hoechst 33342 initiating intrinsic apoptotic cell death pathways.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Apoptosis and necrosis are distinct cell death mechanisms.
  • Apoptosis is a programmed cell death with unique features.
  • Two main apoptotic pathways exist: extrinsic (receptor-linked, caspase 8) and intrinsic (mitochondrial, caspase 3).

Purpose of the Study:

  • To explore the mechanisms of apoptosis, particularly intrinsic pathway activation.
  • To investigate the role of specific agents in inducing apoptosis.
  • To understand the regulation of apoptotic pathways by nitric oxide and transcription factors.

Main Methods:

  • Investigated agents binding to DNA minor groove (e.g., camptothecin, Hoechst 33342).
  • Analyzed disruption of protein-DNA complexes (TBP/TATA, RPA/ssDNA, Topo I/DNA).

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  • Measured intracellular concentrations of E2F-1 and nitric oxide.

    • Main Results:

    • Hoechst 33342 inhibits topoisomerase I, RNA polymerase II, and DNA polymerase, initiating intrinsic apoptosis.
    • Hoechst 33342-induced apoptosis involves disruption of key protein-DNA complexes.
    • Increased E2F-1 and nitric oxide concentrations are associated with this apoptotic pathway.

    Conclusions:

    • Cancer chemotherapy utilizes apoptosis, with DNA-binding agents triggering intrinsic pathways.
    • Nitric oxide and transcription factors play regulatory roles in apoptosis.
    • Therapeutic strategies targeting apoptosis are crucial for treating diseases with dysregulated cell death rates.