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Egr-1 is required for neu/HER2-induced mammary tumors

Sunhwa Oh1, Hyungjoo Kim1, KeeSoo Nam1

  • 1Department of Life Science, Hanyang University, Seoul 04763, Republic of Korea.

Cellular Signalling
|February 7, 2018
PubMed

Insights

Early growth response-1 (Egr-1) deletion delayed tumor development in HER2/neu-driven breast cancer models. This suggests Egr-1 acts as an oncogene in this specific cancer type.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Early growth response-1 (Egr-1) is typically recognized as a tumor suppressor.
  • Its precise role in HER2/neu-driven breast cancer requires further elucidation.

Purpose of the Study:

  • To investigate the in vivo and in vitro role of Egr-1 in HER2/neu-induced breast tumorigenesis.
  • To determine if Egr-1 acts as a tumor suppressor or oncogene in this context.

Main Methods:

  • Utilized mouse models with HER2/neu overexpression and Egr-1 knockout (KO) or wild-type (WT) genotypes.
  • Compared tumor onset and multiplicity between neu/Egr-1 KO and neu/Egr-1 WT/heterozygote mice.
  • Established and analyzed neu/Egr-1 WT and KO tumor cell lines in vitro.

Main Results:

  • Egr-1 deletion significantly delayed tumor development in vivo.
  • Egr-1 knockout tumor cell lines exhibited a decreased rate of cell growth in vitro.
  • These findings contradict the typical tumor suppressor role of Egr-1 in this model.

Conclusions:

  • Egr-1 appears to play an oncogenic role in HER2/neu-driven mammary tumorigenesis.
  • Targeting Egr-1 could be a potential therapeutic strategy for HER2/neu-positive breast cancers.
Keywords:
Egr-1HER2Mammary tumorsNeu

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