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[Apoptosis and chemosensitivity]

K Nishio1, H Arioka, N Saijo

  • 1Pharmacology Division, National Cancer Center Research Institute.

Gan to Kagaku Ryoho. Cancer & Chemotherapy
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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Cellular factors like Bcl-2 influence cancer cell death from chemotherapy. Understanding these apoptosis mechanisms can guide treatment efficacy and prognosis for cancer patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Antineoplastic drugs and irradiation induce apoptosis (programmed cell death) in cancer cells.
  • ICE and ICE-like proteases are crucial in drug-induced apoptosis.
  • Cellular factors significantly impact cancer cell susceptibility to apoptosis.

Purpose of the Study:

  • To evaluate cellular factors influencing apoptosis in cancer cells.
  • To investigate the role of gene transfection in modulating cancer cell response to anticancer drugs.

Main Methods:

  • Gene transfection of human small cell lung cancer cells with bcl 2, p53, Rb, and p16 genes.
  • Assessment of cellular resistance and DNA fragmentation following drug treatment (mitomycin C, irinotecan, taxanes, topoisomerase I inhibitors).

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Main Results:

  • Introduction of the bcl 2 gene conferred resistance to mitomycin C and irinotecan, reducing DNA fragmentation.
  • Wild-type p53-transfected cells showed sensitivity to anticancer drugs.
  • p53-depleted cells were more sensitive to taxanes.
  • Rb and p16 gene introduction enhanced cytotoxicity of specific anticancer agents.

Conclusions:

  • Apoptosis is a key mechanism of cell death induced by certain antineoplastic drugs.
  • Bcl 2 family proteins play a role in drug-induced apoptosis, but their clinical prognostic value requires further investigation.
  • Cellular proteins like p53, Rb, and p16 influence cancer cell sensitivity to various chemotherapeutic agents.