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Long noncoding RNA MILIP promotes triple-negative breast cancer (TNBC) growth by enhancing protein production. Targeting MILIP offers a new therapeutic strategy for TNBC, alone or with protein synthesis inhibitors.

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • RNA Biology

Background:

  • Triple-negative breast cancer (TNBC) presents a poor prognosis due to limited targeted therapies.
  • The long noncoding RNA (lncRNA) MILIP is highly expressed in TNBC, often associated with p53 mutations.

Purpose of the Study:

  • To investigate the role of lncRNA MILIP in TNBC pathogenesis.
  • To explore MILIP as a potential therapeutic target for TNBC.

Main Methods:

  • Assessed MILIP expression in TNBC cells.
  • Investigated MILIP's interaction with transfer RNAs (tRNAs) and eukaryotic translation elongation factor 1 alpha 1 (eEF1α1).
  • Evaluated the impact of targeting MILIP on TNBC cell viability, protein synthesis, and tumor growth in vivo, including combination therapy.

Main Results:

  • MILIP silencing suppressed TNBC cell viability and xenograft growth.
  • MILIP complexes with tRNAs and eEF1α1 to promote protein synthesis, distinct from its role in other cancers.
  • Disrupting MILIP interactions reduced protein synthesis and cell viability.
  • Targeting MILIP inhibited TNBC growth and showed synergy with omacetaxine mepesuccinate.

Conclusions:

  • MILIP acts as an RNA translation elongation factor promoting protein production in TNBC.
  • Targeting MILIP presents a promising therapeutic avenue for TNBC, potentially in combination with protein synthesis inhibitors.