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Rapamycin induces apoptosis when autophagy is inhibited in T-47D mammary cells and both processes are regulated by

Ahmed Ismail Hassan Moad1, Tengku Sifzizul Tengku Muhammad, Chern Ein Oon

  • 1Advanced Medical and Dental Institute, Universiti Sains Malaysia, Pulau Pinang, Malaysia.

Cell Biochemistry and Biophysics
|January 10, 2013
PubMed

Insights

Rapamycin triggers autophagy in breast cancer cells, but inhibiting this process with 3-MA causes apoptosis. The Phlda1 gene regulates both cell death pathways.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Autophagy is a conserved lysosomal degradation pathway crucial for cellular homeostasis.
  • Functional links exist between autophagy and apoptosis, but molecular determinants remain unclear.
  • Understanding the interplay between these pathways is vital for cancer therapy.

Purpose of the Study:

  • To investigate rapamycin-induced autophagy in T-47D breast carcinoma cells.
  • To determine the effects of inhibiting autophagy on rapamycin's action.
  • To identify molecular regulators of the autophagy-apoptosis balance.

Main Methods:

  • Rapamycin treatment of T-47D cells to induce autophagy.
  • Inhibition of autophagy using 3-methyladenine (3-MA).
  • Gene expression analysis, including Phlda1, and gene silencing experiments.

Main Results:

  • Rapamycin successfully induced autophagy in T-47D cells.
  • Autophagy inhibition by 3-MA shifted rapamycin's effect towards apoptosis.
  • Phlda1 was upregulated in both autophagy and apoptosis; its silencing reduced both.

Conclusions:

  • Phlda1 acts as a positive regulator, mediating both autophagy and apoptosis.
  • The balance between autophagy and apoptosis can be modulated by targeting Phlda1.
  • This study sheds light on the molecular mechanisms governing cell fate decisions.

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