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High mobility group A1 protein expression reduces the sensitivity of colon and thyroid cancer cells to antineoplastic

Daniela D'Angelo1, Paula Mussnich, Roberta Rosa

  • 1Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o, Università di Napoli Federico II, Via Pansini 5, 80131 Naples, Italy. daniela.dangelo@unina.it.

BMC Cancer
|November 21, 2014
PubMed
Abstract

Insights

Blocking HMGA1 expression enhances cancer drug sensitivity. This approach targets survival and DNA repair pathways, overcoming chemoresistance in various cancer cells.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Drug resistance and reduced survival are major chemotherapy challenges.
  • High HMGA1 gene expression correlates with antineoplastic drug resistance.
  • HMGA1 inhibition in thyroid cancer cells increases sensitivity to DNA-damaging agents.

Purpose of the Study:

  • To investigate the role of HMGA1 proteins in chemoresistance.
  • To analyze drug resistance in colon carcinoma cells with varying HMGA1 levels.

Main Methods:

  • Compared cetuximab and 5-fluorouracil sensitivity in HMGA1-low (GEO) and HMGA1-high (GEO CR) colon cancer cells.
  • Silenced HMGA1 expression in GEO CR cells and assessed drug cytotoxicity.
  • Examined effects of HMGA1 and drug treatment (doxorubicin, LBH589) in anaplastic thyroid carcinoma cells.

Main Results:

  • GEO CR cells showed reduced sensitivity to cetuximab and 5-fluorouracil compared to GEO cells.
  • HMGA1 silencing in GEO CR cells increased susceptibility to drug-induced cytotoxicity.
  • HMGA1 overexpression promoted DNA damage response, Akt phosphorylation, and prosurvival signaling.

Conclusions:

  • Inhibiting HMGA1 expression is a potential strategy to improve cancer cell chemosensitivity.
  • Blocking HMGA1 can enhance sensitivity to antineoplastic drugs by disrupting survival and DNA repair pathways.

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