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P53 Is Involved in a Three-Dimensional Architecture-Mediated Decrease in Chemosensitivity in Colon Cancer.

Jianming He1, Xi Liang2, Fen Luo3

  • 11. Department Of Oncology And Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing, 400038 China;

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|June 18, 2016
PubMed
Summary
This summary is machine-generated.

Three-dimensional (3D) colon cancer models show reduced sensitivity to platinum chemotherapy compared to 2D cultures. The tumor architecture influences drug response, with p53 playing a key role in this decreased chemosensitivity.

Keywords:
colorectal cancer cells.p53platinumthree-dimensional culture

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Area of Science:

  • Oncology
  • Cell Biology
  • Drug Discovery

Background:

  • Three-dimensional (3D) cell cultures better mimic in vivo tumor architecture than 2D cultures.
  • Understanding architectural effects on chemosensitivity is crucial for colon cancer treatment.

Purpose of the Study:

  • To investigate the impact of 3D architecture on colon cancer cell sensitivity to platinum-based chemotherapy.
  • To elucidate the role of p53 and mitogen-activated protein kinases (MAPKs) in this process.

Main Methods:

  • Comparison of platinum chemosensitivity between 2D and 3D colon cancer cell cultures (HCT116, LoVo).
  • Assessment of p53, γ-H2AX, cleaved caspase 3, and MAPK (JNK1/2, p38) activation.
  • Gene knockdown experiments for p53 and inhibition of JNK1/2 and p38 pathways.

Main Results:

  • 3D cultures exhibited significantly decreased sensitivity to platinum chemotherapy compared to 2D cultures.
  • Cisplatin induced less p53 activation in 3D cultures, and p53 knockdown reduced platinum sensitivity.
  • p53 knockdown decreased cisplatin-induced apoptosis and JNK1/2 activation; JNK1/2 inhibition increased chemosensitivity.

Conclusions:

  • 3D tumor architecture confers decreased chemosensitivity to platinum in colon cancer.
  • p53 is a key mediator in the 3D architecture-driven reduction of platinum efficacy.
  • MAPK pathways (JNK1/2, p38) are not the dominant mechanism in this context.