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Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells
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Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells

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Pradimicin-IRD exhibits antineoplastic effects by inducing DNA damage in colon cancer cells

Larissa Costa de Almeida1, Anelize Bauermeister2, Paula Rezende-Teixeira1

  • 1Department of Pharmacology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.

Biochemical Pharmacology
|June 23, 2019
PubMed

Insights

Pradimicin-IRD, a novel antibiotic, shows significant anticancer activity by inducing DNA damage, apoptosis, and cell cycle arrest in colon cancer cells. This compound offers a promising new therapeutic option, particularly for drug-resistant cancers.

Area of Science:

  • Pharmacology and Toxicology
  • Molecular Biology
  • Oncology

Background:

  • DNA-damaging agents are crucial in cancer therapy but face limitations due to toxicity and drug resistance.
  • Novel therapeutic agents are essential to overcome these challenges and improve patient outcomes.
  • Pradimicin-IRD, a polycyclic antibiotic from Amycolatopsis sp., previously demonstrated antimicrobial and potential anticancer properties.

Purpose of the Study:

  • To further investigate the cytotoxic activity of pradimicin-IRD against colon cancer cells.
  • To elucidate the cellular and molecular mechanisms underlying pradimicin-IRD's antitumor effects.
  • To assess the potential of pradimicin-IRD as a novel DNA-damaging anticancer agent.

Main Methods:

  • Cytotoxic activity of pradimicin-IRD was evaluated in five colon cancer cell lines and non-tumor fibroblasts.
  • Cellular and molecular mechanisms were studied in HCT 116 colorectal cancer cells, including DNA damage, apoptosis, and cell cycle markers.
  • Mass spectrometry was employed to analyze pradimicin-IRD's interaction with DNA.

Main Results:

  • Pradimicin-IRD exhibited significant cytotoxic effects against all tested colon cancer cells (IC50 in micromolar range) with greater selectivity than against normal fibroblasts.
  • The compound induced DNA damage (γH2AX, p21), apoptosis (PARP1, caspase 3 cleavage), and cell cycle arrest (reduced Rb phosphorylation, altered cyclin expression).
  • Pradimicin-IRD demonstrated TP53-independent regulation of p21 expression and direct interaction with DNA.

Conclusions:

  • Pradimicin-IRD possesses multiple antineoplastic activities, including DNA damage, apoptosis induction, and cell cycle arrest, making it a promising anticancer agent.
  • The drug's efficacy is observed across various colon cancer cell lines, including those with common TP53 and KRAS mutations.
  • Pradimicin-IRD represents a potential novel therapeutic strategy, particularly as a DNA-damaging agent for cancer treatment.
Keywords:
Antitumor agentDNA-bindingDNA-damageNatural productsPradimicin

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