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Oroxin A inhibits breast cancer cell growth by inducing robust endoplasmic reticulum stress and senescence

Jun He1, Longsheng Du, Meimei Bao

  • 1Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, 2011 Collaborative Innovation Center of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Ministry of Health, Soochow University, Suzhou, Jiangsu, People's Republic of China.

Anti-Cancer Drugs
|November 25, 2015
PubMed

Insights

Oroxin A, from Oroxylum indicum, inhibits breast cancer cell growth by inducing endoplasmic reticulum (ER) stress and senescence. This natural compound activates the p38 signaling pathway, offering a potential new treatment for advanced breast cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Breast cancer remains a leading cause of cancer mortality in women.
  • Effective treatments for advanced and metastatic breast cancer are urgently needed.
  • Oroxylum indicum (L.) Kurz is a plant with potential medicinal properties.

Purpose of the Study:

  • To investigate the anticancer effects of oroxin A, a component of Oroxylum indicum.
  • To determine the mechanism by which oroxin A inhibits breast cancer cell growth.
  • To explore the role of endoplasmic reticulum (ER) stress and senescence in oroxin A's action.

Main Methods:

  • Cell culture of human breast cancer cell lines (MDA-MB-231 and MCF7).
  • Treatment with oroxin A and assessment of cell cycle, mitosis, and cytoskeleton.
  • Analysis of ER stress markers (ER-Tracker Red, ATF4, GRP78) and senescence markers (β-Gal activity, SAHF).
  • Measurement of intracellular reactive oxygen species (ROS) and p38 signaling pathway activation.

Main Results:

  • Oroxin A significantly inhibited the growth of MDA-MB-231 and MCF7 breast cancer cells.
  • Oroxin A induced cell cycle arrest at the G2/M stage and decreased mitosis.
  • Oroxin A treatment led to increased ER stress, evidenced by elevated ER-Tracker Red-positive cells, ATF4, and GRP78 expression.
  • Oroxin A promoted senescence, indicated by increased β-Gal activity and SAHF staining.
  • Oroxin A increased intracellular ROS levels and activated the p38 signaling pathway.

Conclusions:

  • Oroxin A exhibits potent anticancer activity against human breast cancer cells.
  • The mechanism involves the induction of endoplasmic reticulum (ER) stress-mediated senescence.
  • Oroxin A activates the p38 signaling pathway and key ER stress genes ATF4 and GRP78.
  • Oroxin A represents a promising natural compound for the development of novel breast cancer therapies.

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